Initial commit

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Python Debugger: Current File",
+            "type": "debugpy",
+            "request": "launch",
+            "program": "${file}",
+            "console": "integratedTerminal"
+        }
+    ]
+}

Dockerfile

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+# Use the official Python image from the Docker Hub
+FROM python:3.10-slim
+
+# Install dependencies (Including SQLite libraries and timezone data)
+RUN apt-get update && \
+    apt-get install -y \
+        iputils-ping \
+        curl \
+        apt-transport-https \
+        sqlite3 \
+        libsqlite3-dev \
+        tzdata && \
+    rm -rf /var/lib/apt/lists/*
+
+# Set the timezone environment variable
+ENV TZ="Asia/Manila"
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy the requirements.txt file into the container
+COPY requirements.txt .
+
+# Install the dependencies
+RUN pip install --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of your application code into the container
+COPY . .
+
+# Expose port 1000 to the outside world
+EXPOSE 1000
+
+# Define the command to run your application (app.py as primary file)
+CMD ["python", "app.py"]

Procfile

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+web: gunicorn app:app

app.py

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+import os
+import sqlite3
+import uuid
+import hashlib
+import datetime
+from flask import Flask, render_template, request, redirect, url_for, flash, session, send_from_directory
+from werkzeug.utils import secure_filename
+from functools import wraps
+
+app = Flask(__name__)
+app.secret_key = os.environ.get('SECRET_KEY', os.urandom(24))
+
+# Configuration
+UPLOAD_FOLDER = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'uploads')
+ALLOWED_EXTENSIONS = {'pdf', 'docx', 'xlsx', 'jpg', 'png', 'mp4', 'txt'}
+DB_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'dms.db')
+
+# Create upload folder if it doesn't exist
+if not os.path.exists(UPLOAD_FOLDER):
+    os.makedirs(UPLOAD_FOLDER)
+
+app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
+app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024  # 16MB max upload size
+
+# Production configuration
+app.config['PREFERRED_URL_SCHEME'] = 'https'
+app.config['SESSION_COOKIE_SECURE'] = False
+app.config['SESSION_COOKIE_HTTPONLY'] = True
+app.config['PERMANENT_SESSION_LIFETIME'] = datetime.timedelta(days=1)
+
+# Database initialization
+def init_db():
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+    
+    # Create users table
+    cursor.execute('''
+    CREATE TABLE IF NOT EXISTS users (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        username TEXT UNIQUE NOT NULL,
+        password TEXT NOT NULL,
+        email TEXT UNIQUE NOT NULL,
+        role TEXT NOT NULL,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+    )
+    ''')
+    
+    # Create documents table
+    cursor.execute('''
+    CREATE TABLE IF NOT EXISTS documents (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        filename TEXT NOT NULL,
+        original_filename TEXT NOT NULL,
+        custom_filename TEXT NOT NULL,
+        file_type TEXT NOT NULL,
+        file_size INTEGER NOT NULL,
+        category TEXT NOT NULL,
+        user_id INTEGER NOT NULL,
+        visibility TEXT NOT NULL,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        FOREIGN KEY (user_id) REFERENCES users (id)
+    )
+    ''')
+    
+    # Create document_shares table
+    cursor.execute('''
+    CREATE TABLE IF NOT EXISTS document_shares (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        document_id INTEGER NOT NULL,
+        shared_by INTEGER NOT NULL,
+        shared_with INTEGER,
+        share_link TEXT,
+        qr_code TEXT,
+        expires_at TIMESTAMP,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        FOREIGN KEY (document_id) REFERENCES documents (id),
+        FOREIGN KEY (shared_by) REFERENCES users (id),
+        FOREIGN KEY (shared_with) REFERENCES users (id)
+    )
+    ''')
+    
+    # Create document_versions table
+    cursor.execute('''
+    CREATE TABLE IF NOT EXISTS document_versions (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        document_id INTEGER NOT NULL,
+        filename TEXT NOT NULL,
+        version_number INTEGER NOT NULL,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        FOREIGN KEY (document_id) REFERENCES documents (id)
+    )
+    ''')
+    
+    # Create analytics table
+    cursor.execute('''
+    CREATE TABLE IF NOT EXISTS analytics (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        document_id INTEGER NOT NULL,
+        action TEXT NOT NULL,
+        user_id INTEGER,
+        ip_address TEXT,
+        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+        FOREIGN KEY (document_id) REFERENCES documents (id),
+        FOREIGN KEY (user_id) REFERENCES users (id)
+    )
+    ''')
+    
+    # Insert default admin user if not exists
+    cursor.execute("SELECT * FROM users WHERE username = 'admin'")
+    if not cursor.fetchone():
+        # Password: admin123
+        hashed_password = hashlib.sha256("admin123".encode()).hexdigest()
+        cursor.execute("INSERT INTO users (username, password, email, role) VALUES (?, ?, ?, ?)",
+                      ("admin", hashed_password, "admin@example.com", "admin"))
+    
+    # Insert default regular user if not exists
+    cursor.execute("SELECT * FROM users WHERE username = 'user'")
+    if not cursor.fetchone():
+        # Password: user123
+        hashed_password = hashlib.sha256("user123".encode()).hexdigest()
+        cursor.execute("INSERT INTO users (username, password, email, role) VALUES (?, ?, ?, ?)",
+                      ("user", hashed_password, "user@example.com", "user"))
+    
+    conn.commit()
+    conn.close()
+
+# Helper functions
+def allowed_file(filename):
+    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
+
+def get_file_type(filename):
+    ext = filename.rsplit('.', 1)[1].lower()
+    if ext in ['pdf']:
+        return 'pdf'
+    elif ext in ['docx', 'doc']:
+        return 'document'
+    elif ext in ['xlsx', 'xls']:
+        return 'spreadsheet'
+    elif ext in ['jpg', 'jpeg', 'png', 'gif']:
+        return 'image'
+    elif ext in ['mp4', 'avi', 'mov']:
+        return 'video'
+    else:
+        return 'other'
+
+def get_db_connection():
+    conn = sqlite3.connect(DB_PATH)
+    conn.row_factory = sqlite3.Row
+    return conn
+
+# Authentication decorator
+def login_required(f):
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        if 'user_id' not in session:
+            flash('Please log in to access this page', 'error')
+            return redirect(url_for('login'))
+        return f(*args, **kwargs)
+    return decorated_function
+
+def admin_required(f):
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        if 'user_id' not in session:
+            flash('Please log in to access this page', 'error')
+            return redirect(url_for('login'))
+        
+        conn = get_db_connection()
+        user = conn.execute('SELECT * FROM users WHERE id = ?', (session['user_id'],)).fetchone()
+        conn.close()
+        
+        if user['role'] != 'admin':
+            flash('Admin access required', 'error')
+            return redirect(url_for('dashboard'))
+        
+        return f(*args, **kwargs)
+    return decorated_function
+
+# Routes
+@app.route('/')
+def index():
+    if 'user_id' in session:
+        return redirect(url_for('dashboard'))
+    return render_template('index.html')
+
+@app.route('/login', methods=['GET', 'POST'])
+def login():
+    if request.method == 'POST':
+        username = request.form['username']
+        password = request.form['password']
+        hashed_password = hashlib.sha256(password.encode()).hexdigest()
+        
+        conn = get_db_connection()
+        user = conn.execute('SELECT * FROM users WHERE username = ? AND password = ?',
+                          (username, hashed_password)).fetchone()
+        conn.close()
+        
+        if user:
+            session['user_id'] = user['id']
+            session['username'] = user['username']
+            session['role'] = user['role']
+            flash(f'Welcome back, {username}!', 'success')
+            return redirect(url_for('dashboard'))
+        else:
+            flash('Invalid username or password', 'error')
+            return render_template('login.html')
+    else:
+        return render_template('login.html')
+
+@app.route('/logout')
+def logout():
+    session.clear()
+    flash('You have been logged out', 'info')
+    return redirect(url_for('index'))
+
+@app.route('/dashboard')
+@login_required
+def dashboard():
+    conn = get_db_connection()
+    
+    # Get document counts by category
+    category_counts = conn.execute('''
+        SELECT category, COUNT(*) as count
+        FROM documents
+        WHERE user_id = ? OR visibility = "public" 
+        OR id IN (SELECT document_id FROM document_shares WHERE shared_with = ?)
+        GROUP BY category
+    ''', (session['user_id'], session['user_id'])).fetchall()
+    
+    # Get recent documents (limited to 5)
+    recent_documents = conn.execute('''
+        SELECT * FROM documents 
+        WHERE user_id = ? OR visibility = "public" 
+        OR id IN (SELECT document_id FROM document_shares WHERE shared_with = ?)
+        ORDER BY created_at DESC
+        LIMIT 5
+    ''', (session['user_id'], session['user_id'])).fetchall()
+    
+    # Get analytics data for admin
+    if session['role'] == 'admin':
+        analytics = conn.execute('''
+            SELECT documents.custom_filename, COUNT(analytics.id) as view_count
+            FROM documents
+            LEFT JOIN analytics ON documents.id = analytics.document_id
+            WHERE analytics.action = 'view'
+            GROUP BY documents.id
+            ORDER BY view_count DESC
+            LIMIT 5
+        ''').fetchall()
+        
+        # Get user activity
+        user_activity = conn.execute('''
+            SELECT users.username, COUNT(analytics.id) as action_count
+            FROM analytics
+            JOIN users ON analytics.user_id = users.id
+            GROUP BY analytics.user_id
+            ORDER BY action_count DESC
+            LIMIT 5
+        ''').fetchall()
+    else:
+        analytics = None
+        user_activity = None
+    
+    conn.close()
+    
+    return render_template('dashboard.html', 
+                          recent_documents=recent_documents, 
+                          category_counts=category_counts,
+                          analytics=analytics,
+                          user_activity=user_activity)
+
+@app.route('/upload', methods=['GET', 'POST'])
+@login_required
+def upload():
+    if request.method == 'POST':
+        # Check if the post request has the file part
+        if 'file' not in request.files:
+            flash('No file part', 'error')
+            return redirect(request.url)
+        
+        file = request.files['file']
+        visibility = request.form.get('visibility', 'private')
+        custom_filename = request.form.get('custom_filename', '').strip()
+        category = request.form.get('category', 'general')
+        
+        # If user does not select file, browser also
+        # submit an empty part without filename
+        if file.filename == '':
+            flash('No selected file', 'error')
+            return redirect(request.url)
+        
+        if file and allowed_file(file.filename):
+            # Generate unique filename
+            original_filename = secure_filename(file.filename)
+            file_extension = original_filename.rsplit('.', 1)[1].lower()
+            unique_filename = f"{uuid.uuid4().hex}.{file_extension}"
+            
+            # Use custom filename if provided, otherwise use original
+            if not custom_filename:
+                custom_filename = os.path.splitext(original_filename)[0]
+            
+            # Save the file
+            file_path = os.path.join(app.config['UPLOAD_FOLDER'], unique_filename)
+            file.save(file_path)
+            
+            # Get file size
+            file_size = os.path.getsize(file_path)
+            
+            # Save to database
+            conn = get_db_connection()
+            cursor = conn.cursor()
+            cursor.execute('''
+                INSERT INTO documents (filename, original_filename, custom_filename, file_type, file_size, category, user_id, visibility)
+                VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+            ''', (unique_filename, original_filename, custom_filename, get_file_type(original_filename), file_size, category, session['user_id'], visibility))
+            
+            document_id = cursor.lastrowid
+            
+            # Add initial version
+            cursor.execute('''
+                INSERT INTO document_versions (document_id, filename, version_number)
+                VALUES (?, ?, ?)
+            ''', (document_id, unique_filename, 1))
+            
+            conn.commit()
+            conn.close()
+            
+            flash('File successfully uploaded', 'success')
+            return redirect(url_for('files'))
+        else:
+            flash(f'Allowed file types are: {", ".join(ALLOWED_EXTENSIONS)}', 'error')
+    
+    # Get available categories
+    categories = ['admin', 'accounting', 'hr', 'marketing', 'legal', 'general', 'other']
+    
+    return render_template('upload.html', categories=categories)
+
+@app.route('/files')
+@login_required
+def files():
+    # Get query parameters
+    search_query = request.args.get('search', '')
+    selected_category = request.args.get('category', 'all')
+    page = request.args.get('page', 1, type=int)
+    per_page = 10  # Number of documents per page
+    
+    conn = get_db_connection()
+    
+    # Base query
+    query = '''
+        SELECT * FROM documents 
+        WHERE (user_id = ? OR visibility = "public" 
+        OR id IN (SELECT document_id FROM document_shares WHERE shared_with = ?))
+    '''
+    params = [session['user_id'], session['user_id']]
+    
+    # Add search condition if search query provided
+    if search_query:
+        query += ' AND (custom_filename LIKE ? OR original_filename LIKE ?)'
+        params.extend(['%' + search_query + '%', '%' + search_query + '%'])
+    
+    # Add category filter if specific category selected
+    if selected_category != 'all':
+        query += ' AND category = ?'
+        params.append(selected_category)
+    
+    # Count total matching documents
+    count_query = query.replace('SELECT *', 'SELECT COUNT(*)')
+    total_docs = conn.execute(count_query, params).fetchone()[0]
+    
+    # Add pagination
+    query += ' ORDER BY created_at DESC LIMIT ? OFFSET ?'
+    offset = (page - 1) * per_page
+    params.extend([per_page, offset])
+    
+    # Execute final query
+    documents = conn.execute(query, params).fetchall()
+    
+    # Get available categories for filter dropdown
+    categories = ['admin', 'accounting', 'hr', 'marketing', 'legal', 'general', 'other']
+    
+    # Calculate pagination info
+    total_pages = (total_docs + per_page - 1) // per_page  # Ceiling division
+    pagination = {
+        'page': page,
+        'per_page': per_page,
+        'total': total_docs,
+        'pages': total_pages
+    }
+    
+    conn.close()
+    
+    return render_template('files.html', 
+                          documents=documents, 
+                          categories=categories,
+                          selected_category=selected_category,
+                          search_query=search_query,
+                          pagination=pagination)
+
+@app.route('/document/<int:document_id>/edit', methods=['GET', 'POST'])
+@login_required
+def edit_document(document_id):
+    conn = get_db_connection()
+    
+    # Get document
+    document = conn.execute('SELECT * FROM documents WHERE id = ?', (document_id,)).fetchone()
+    
+    if not document:
+        conn.close()
+        flash('Document not found', 'error')
+        return redirect(url_for('files'))
+    
+    # Check ownership
+    if document['user_id'] != session['user_id'] and session['role'] != 'admin':
+        conn.close()
+        flash('You do not have permission to edit this document', 'error')
+        return redirect(url_for('files'))
+    
+    # Get available categories
+    categories = ['admin', 'accounting', 'hr', 'marketing', 'legal', 'general', 'other']
+    
+    if request.method == 'POST':
+        custom_filename = request.form.get('custom_filename', '').strip()
+        category = request.form.get('category', 'general')
+        visibility = request.form.get('visibility', 'private')
+        
+        # Use custom filename if provided, otherwise keep existing
+        if not custom_filename:
+            custom_filename = document['custom_filename']
+        
+        # Update document
+        conn.execute('''
+            UPDATE documents 
+            SET custom_filename = ?, category = ?, visibility = ?, updated_at = CURRENT_TIMESTAMP
+            WHERE id = ?
+        ''', (custom_filename, category, visibility, document_id))
+        
+        conn.commit()
+        conn.close()
+        
+        flash('Document updated successfully', 'success')
+        return redirect(url_for('view_document', document_id=document_id))
+    
+    conn.close()
+    
+    return render_template('edit_document.html', document=document, categories=categories)
+
+@app.route('/document/<int:document_id>')
+@login_required
+def view_document(document_id):
+    conn = get_db_connection()
+    
+    # Get document
+    document = conn.execute('SELECT * FROM documents WHERE id = ?', (document_id,)).fetchone()
+    
+    if not document:
+        conn.close()
+        flash('Document not found', 'error')
+        return redirect(url_for('dashboard'))
+    
+    # Check permissions
+    if document['visibility'] != 'public' and document['user_id'] != session['user_id']:
+        # Check if shared with user
+        shared = conn.execute('''
+            SELECT * FROM document_shares 
+            WHERE document_id = ? AND shared_with = ?
+        ''', (document_id, session['user_id'])).fetchone()
+        
+        if not shared and session['role'] != 'admin':
+            conn.close()
+            flash('You do not have permission to view this document', 'error')
+            return redirect(url_for('dashboard'))
+    
+    # Record view in analytics
+    conn.execute('''
+        INSERT INTO analytics (document_id, action, user_id, ip_address)
+        VALUES (?, ?, ?, ?)
+    ''', (document_id, 'view', session['user_id'], request.remote_addr))
+    
+    # Get document versions
+    versions = conn.execute('''
+        SELECT * FROM document_versions
+        WHERE document_id = ?
+        ORDER BY version_number DESC
+    ''', (document_id,)).fetchall()
+    
+    # Get share information
+    shares = conn.execute('''
+        SELECT document_shares.*, users.username
+        FROM document_shares
+        LEFT JOIN users ON document_shares.shared_with = users.id
+        WHERE document_id = ?
+    ''', (document_id,)).fetchall()
+    
+    conn.commit()
+    conn.close()
+    
+    return render_template('view_document.html', document=document, versions=versions, shares=shares)
+
+
+@app.route('/document/<int:document_id>/file')
+@login_required
+def serve_document_file(document_id):
+    conn = get_db_connection()
+
+    # Get document
+    document = conn.execute('SELECT * FROM documents WHERE id = ?', (document_id,)).fetchone()
+
+    if not document:
+        conn.close()
+        flash('Document not found', 'error')
+        return redirect(url_for('dashboard'))
+
+    # Check permissions
+    if document['visibility'] != 'public' and document['user_id'] != session['user_id']:
+        shared = conn.execute(''' 
+            SELECT * FROM document_shares 
+            WHERE document_id = ? AND shared_with = ? 
+        ''', (document_id, session['user_id'])).fetchone()
+
+        if not shared and session['role'] != 'admin':
+            conn.close()
+            flash('You do not have permission to view this document', 'error')
+            return redirect(url_for('dashboard'))
+
+    try:
+        # Serve the document without download (viewable in browser)
+        return send_from_directory(app.config['UPLOAD_FOLDER'], document['filename'],
+                                   as_attachment=False, download_name=document['original_filename'])
+    except FileNotFoundError:
+        flash('Document file not found', 'error')
+        conn.close()
+        return redirect(url_for('dashboard'))
+    finally:
+        conn.close()
+
+
+@app.route('/document/<int:document_id>/download')
+@login_required
+def download_document(document_id):
+    conn = get_db_connection()
+    
+    # Get document
+    document = conn.execute('SELECT * FROM documents WHERE id = ?', (document_id,)).fetchone()
+    
+    if not document:
+        conn.close()
+        flash('Document not found', 'error')
+        return redirect(url_for('dashboard'))
+    
+    # Check permissions
+    if document['visibility'] != 'public' and document['user_id'] != session['user_id']:
+        # Check if shared with user
+        shared = conn.execute('''
+            SELECT * FROM document_shares 
+            WHERE document_id = ? AND shared_with = ?
+        ''', (document_id, session['user_id'])).fetchone()
+        
+        if not shared and session['role'] != 'admin':
+            conn.close()
+            flash('You do not have permission to download this document', 'error')
+            return redirect(url_for('dashboard'))
+    
+    # Record download in analytics
+    conn.execute('''
+        INSERT INTO analytics (document_id, action, user_id, ip_address)
+        VALUES (?, ?, ?, ?)
+    ''', (document_id, 'download', session['user_id'], request.remote_addr))
+    
+    conn.commit()
+    conn.close()
+    
+    return send_from_directory(app.config['UPLOAD_FOLDER'], document['filename'], 
+                              as_attachment=True, download_name=document['original_filename'])
+
+@app.route('/document/<int:document_id>/share', methods=['GET', 'POST'])
+@login_required
+def share_document(document_id):
+    conn = get_db_connection()
+    
+    # Get document
+    document = conn.execute('SELECT * FROM documents WHERE id = ?', (document_id,)).fetchone()
+    
+    if not document:
+        conn.close()
+        flash('Document not found', 'error')
+        return redirect(url_for('dashboard'))
+    
+    # Check ownership
+    if document['user_id'] != session['user_id'] and session['role'] != 'admin':
+        conn.close()
+        flash('You do not have permission to share this document', 'error')
+        return redirect(url_for('dashboard'))
+    
+    if request.method == 'POST':
+        share_type = request.form.get('share_type')
+        
+        if share_type == 'user':
+            # Share with specific user
+            username = request.form.get('username')
+            user = conn.execute('SELECT * FROM users WHERE username = ?', (username,)).fetchone()
+            
+            if not user:
+                flash(f'User {username} not found', 'error')
+            else:
+                # Check if already shared
+                existing = conn.execute('''
+                    SELECT * FROM document_shares 
+                    WHERE document_id = ? AND shared_with = ?
+                ''', (document_id, user['id'])).fetchone()
+                
+                if existing:
+                    flash(f'Document already shared with {username}', 'info')
+                else:
+                    conn.execute('''
+                        INSERT INTO document_shares (document_id, shared_by, shared_with)
+                        VALUES (?, ?, ?)
+                    ''', (document_id, session['user_id'], user['id']))
+                    flash(f'Document shared with {username}', 'success')
+        
+        elif share_type == 'link':
+            # Generate shareable link
+            expiry_days = int(request.form.get('expiry', 7))
+            expires_at = datetime.datetime.now() + datetime.timedelta(days=expiry_days)
+            share_token = uuid.uuid4().hex
+            
+            conn.execute('''
+                INSERT INTO document_shares (document_id, shared_by, share_link, expires_at)
+                VALUES (?, ?, ?, ?)
+            ''', (document_id, session['user_id'], share_token, expires_at))
+            
+            flash(f'Shareable link created (expires in {expiry_days} days)', 'success')
+        
+        conn.commit()
+    
+    # Get users for sharing
+    users = conn.execute('SELECT * FROM users WHERE id != ?', (session['user_id'],)).fetchall()
+    
+    # Get existing shares
+    shares = conn.execute('''
+        SELECT document_shares.*, users.username
+        FROM document_shares
+        LEFT JOIN users ON document_shares.shared_with = users.id
+        WHERE document_id = ?
+    ''', (document_id,)).fetchall()
+    
+    conn.close()
+    
+    return render_template('share_document.html', document=document, users=users, shares=shares)
+
+@app.route('/document/<int:document_id>/delete')
+@login_required
+def delete_document(document_id):
+    conn = get_db_connection()
+    
+    # Get document
+    document = conn.execute('SELECT * FROM documents WHERE id = ?', (document_id,)).fetchone()
+    
+    if not document:
+        conn.close()
+        flash('Document not found', 'error')
+        return redirect(url_for('dashboard'))
+    
+    # Check ownership
+    if document['user_id'] != session['user_id'] and session['role'] != 'admin':
+        conn.close()
+        flash('You do not have permission to delete this document', 'error')
+        return redirect(url_for('dashboard'))
+    
+    # Get all versions
+    versions = conn.execute('SELECT * FROM document_versions WHERE document_id = ?', (document_id,)).fetchall()
+    
+    # Delete files
+    for version in versions:
+        file_path = os.path.join(app.config['UPLOAD_FOLDER'], version['filename'])
+        if os.path.exists(file_path):
+            os.remove(file_path)
+    
+    # Delete from database (cascade will handle related records)
+    conn.execute('DELETE FROM analytics WHERE document_id = ?', (document_id,))
+    conn.execute('DELETE FROM document_shares WHERE document_id = ?', (document_id,))
+    conn.execute('DELETE FROM document_versions WHERE document_id = ?', (document_id,))
+    conn.execute('DELETE FROM documents WHERE id = ?', (document_id,))
+    
+    conn.commit()
+    conn.close()
+    
+    flash('Document deleted successfully', 'success')
+    return redirect(url_for('dashboard'))
+
+@app.route('/admin')
+@admin_required
+def admin_panel():
+    conn = get_db_connection()
+    
+    # Get all users
+    users = conn.execute('SELECT * FROM users').fetchall()
+    
+    # Get document statistics
+    doc_stats = conn.execute('''
+        SELECT 
+            COUNT(*) as total_documents,
+            SUM(file_size) as total_size,
+            COUNT(DISTINCT user_id) as total_contributors
+        FROM documents
+    ''').fetchone()
+    
+    # Get activity statistics
+    activity_stats = conn.execute('''
+        SELECT 
+            COUNT(*) as total_actions,
+            COUNT(DISTINCT user_id) as active_users,
+            COUNT(DISTINCT document_id) as accessed_documents
+        FROM analytics
+    ''').fetchone()
+    
+    conn.close()
+    
+    return render_template('admin.html', users=users, doc_stats=doc_stats, activity_stats=activity_stats)
+
+@app.route('/shared/<share_token>')
+def access_shared(share_token):
+    conn = get_db_connection()
+    
+    # Get share information
+    share = conn.execute('''
+        SELECT document_shares.*, documents.* 
+        FROM document_shares
+        JOIN documents ON document_shares.document_id = documents.id
+        WHERE document_shares.share_link = ?
+    ''', (share_token,)).fetchone()
+    
+    if not share:
+        conn.close()
+        flash('Invalid or expired share link', 'error')
+        return redirect(url_for('index'))
+    
+    # Check if expired
+    if share['expires_at'] and datetime.datetime.strptime(share['expires_at'], '%Y-%m-%d %H:%M:%S.%f') < datetime.datetime.now():
+        conn.close()
+        flash('This share link has expired', 'error')
+        return redirect(url_for('index'))
+    
+    # Record view in analytics
+    user_id = session.get('user_id')
+    conn.execute('''
+        INSERT INTO analytics (document_id, action, user_id, ip_address)
+        VALUES (?, ?, ?, ?)
+    ''', (share['document_id'], 'shared_view', user_id, request.remote_addr))
+    
+    conn.commit()
+    
+    # Get document versions
+    versions = conn.execute('''
+        SELECT * FROM document_versions
+        WHERE document_id = ?
+        ORDER BY version_number DESC
+    ''', (share['document_id'],)).fetchall()
+    
+    conn.close()
+    
+    return render_template('shared_view.html', document=share, versions=versions, share_token=share_token)
+
+@app.route('/shared/<share_token>/download')
+def download_shared(share_token):
+    conn = get_db_connection()
+    
+    # Get share information
+    share = conn.execute('''
+        SELECT document_shares.*, documents.* 
+        FROM document_shares
+        JOIN documents ON document_shares.document_id = documents.id
+        WHERE document_shares.share_link = ?
+    ''', (share_token,)).fetchone()
+    
+    if not share:
+        conn.close()
+        flash('Invalid or expired share link', 'error')
+        return redirect(url_for('index'))
+    
+    # Check if expired
+    if share['expires_at'] and datetime.datetime.strptime(share['expires_at'], '%Y-%m-%d %H:%M:%S.%f') < datetime.datetime.now():
+        conn.close()
+        flash('This share link has expired', 'error')
+        return redirect(url_for('index'))
+    
+    # Record download in analytics
+    user_id = session.get('user_id')
+    conn.execute('''
+        INSERT INTO analytics (document_id, action, user_id, ip_address)
+        VALUES (?, ?, ?, ?)
+    ''', (share['document_id'], 'shared_download', user_id, request.remote_addr))
+    
+    conn.commit()
+    conn.close()
+    
+    return send_from_directory(app.config['UPLOAD_FOLDER'], share['filename'], 
+                              as_attachment=True, download_name=share['original_filename'])
+
+# Error handlers
+@app.errorhandler(404)
+def page_not_found(e):
+    return render_template('error.html', error_code=404, error_message="Page not found"), 404
+
+@app.errorhandler(500)
+def internal_server_error(e):
+    return render_template('error.html', error_code=500, error_message="Internal server error"), 500
+
+# Initialize database and start app
+if __name__ == '__main__':
+    init_db()
+    app.run(host='0.0.0.0', port=1000, debug=False)
+else:
+    # For production WSGI servers
+    init_db()

edit_document_route.py

@@ -0,0 +1,47 @@
+@app.route('/document/<int:document_id>/edit', methods=['GET', 'POST'])
+@login_required
+def edit_document(document_id):
+    conn = get_db_connection()
+    
+    # Get document
+    document = conn.execute('SELECT * FROM documents WHERE id = ?', (document_id,)).fetchone()
+    
+    if not document:
+        conn.close()
+        flash('Document not found', 'error')
+        return redirect(url_for('files'))
+    
+    # Check ownership
+    if document['user_id'] != session['user_id'] and session['role'] != 'admin':
+        conn.close()
+        flash('You do not have permission to edit this document', 'error')
+        return redirect(url_for('files'))
+    
+    # Get available categories
+    categories = ['admin', 'accounting', 'hr', 'marketing', 'legal', 'general', 'other']
+    
+    if request.method == 'POST':
+        custom_filename = request.form.get('custom_filename', '').strip()
+        category = request.form.get('category', 'general')
+        visibility = request.form.get('visibility', 'private')
+        
+        # Use custom filename if provided, otherwise keep existing
+        if not custom_filename:
+            custom_filename = document['custom_filename']
+        
+        # Update document
+        conn.execute('''
+            UPDATE documents 
+            SET custom_filename = ?, category = ?, visibility = ?, updated_at = CURRENT_TIMESTAMP
+            WHERE id = ?
+        ''', (custom_filename, category, visibility, document_id))
+        
+        conn.commit()
+        conn.close()
+        
+        flash('Document updated successfully', 'success')
+        return redirect(url_for('view_document', document_id=document_id))
+    
+    conn.close()
+    
+    return render_template('edit_document.html', document=document, categories=categories)

files_route.py

@@ -0,0 +1,61 @@
+@app.route('/files')
+@login_required
+def files():
+    # Get query parameters
+    search_query = request.args.get('search', '')
+    selected_category = request.args.get('category', 'all')
+    page = request.args.get('page', 1, type=int)
+    per_page = 10  # Number of documents per page
+    
+    conn = get_db_connection()
+    
+    # Base query
+    query = '''
+        SELECT * FROM documents 
+        WHERE (user_id = ? OR visibility = "public" 
+        OR id IN (SELECT document_id FROM document_shares WHERE shared_with = ?))
+    '''
+    params = [session['user_id'], session['user_id']]
+    
+    # Add search condition if search query provided
+    if search_query:
+        query += ' AND (custom_filename LIKE ? OR original_filename LIKE ?)'
+        params.extend(['%' + search_query + '%', '%' + search_query + '%'])
+    
+    # Add category filter if specific category selected
+    if selected_category != 'all':
+        query += ' AND category = ?'
+        params.append(selected_category)
+    
+    # Count total matching documents
+    count_query = query.replace('SELECT *', 'SELECT COUNT(*)')
+    total_docs = conn.execute(count_query, params).fetchone()[0]
+    
+    # Add pagination
+    query += ' ORDER BY created_at DESC LIMIT ? OFFSET ?'
+    offset = (page - 1) * per_page
+    params.extend([per_page, offset])
+    
+    # Execute final query
+    documents = conn.execute(query, params).fetchall()
+    
+    # Get available categories for filter dropdown
+    categories = ['admin', 'accounting', 'hr', 'marketing', 'legal', 'general', 'other']
+    
+    # Calculate pagination info
+    total_pages = (total_docs + per_page - 1) // per_page  # Ceiling division
+    pagination = {
+        'page': page,
+        'per_page': per_page,
+        'total': total_docs,
+        'pages': total_pages
+    }
+    
+    conn.close()
+    
+    return render_template('files.html', 
+                          documents=documents, 
+                          categories=categories,
+                          selected_category=selected_category,
+                          search_query=search_query,
+                          pagination=pagination)

requirements.txt

@@ -0,0 +1,7 @@
+Flask==2.3.3
+Werkzeug==2.3.7
+Jinja2==3.1.2
+MarkupSafe==2.1.3
+itsdangerous==2.1.2
+click==8.1.7
+gunicorn==21.2.0

static/scripts.js

@@ -0,0 +1,64 @@
+// Document Management System JavaScript
+document.addEventListener('DOMContentLoaded', function() {
+    // Auto-dismiss flash messages after 5 seconds
+    window.setTimeout(function() {
+        document.querySelectorAll('.alert').forEach(function(alert) {
+            if (bootstrap && bootstrap.Alert) {
+                var bsAlert = new bootstrap.Alert(alert);
+                bsAlert.close();
+            } else {
+                alert.style.display = 'none';
+            }
+        });
+    }, 5000);
+
+    // Copy link functionality
+    window.copyLink = function(elementId) {
+        var copyText = document.getElementById(elementId);
+        if (copyText) {
+            copyText.select();
+            copyText.setSelectionRange(0, 99999);
+            navigator.clipboard.writeText(copyText.value);
+            
+            // Show a temporary tooltip
+            var tooltip = document.createElement("div");
+            tooltip.innerHTML = "Copied!";
+            tooltip.style.position = "fixed";
+            tooltip.style.backgroundColor = "#4CAF50";
+            tooltip.style.color = "white";
+            tooltip.style.padding = "5px 10px";
+            tooltip.style.borderRadius = "5px";
+            tooltip.style.zIndex = "1000";
+            tooltip.style.top = (event.clientY - 30) + "px";
+            tooltip.style.left = event.clientX + "px";
+            document.body.appendChild(tooltip);
+            
+            setTimeout(function() {
+                document.body.removeChild(tooltip);
+            }, 2000);
+        }
+    };
+
+    // Email sharing functionality
+    window.shareViaEmail = function(filename, url) {
+        var subject = "Shared Document: " + filename;
+        var body = "I'm sharing a document with you: " + filename + "\n\nYou can access it here: " + url;
+        window.location.href = "mailto:?subject=" + encodeURIComponent(subject) + "&body=" + encodeURIComponent(body);
+    };
+    
+    // WhatsApp sharing functionality
+    window.shareViaWhatsApp = function(filename, url) {
+        var text = "I'm sharing a document with you: " + filename + "\n\nYou can access it here: " + url;
+        window.open("https://wa.me/?text=" + encodeURIComponent(text), "_blank");
+    };
+
+    // Confirm delete
+    var deleteButtons = document.querySelectorAll('[data-confirm]');
+    deleteButtons.forEach(function(button) {
+        button.addEventListener('click', function(e) {
+            if (!confirm(this.getAttribute('data-confirm'))) {
+                e.preventDefault();
+            }
+        });
+    });
+});

static/styles.css

@@ -0,0 +1,70 @@
+/* Main Styles */
+body {
+    padding-top: 60px;
+    background-color: #f8f9fa;
+}
+
+.card {
+    margin-bottom: 20px;
+    box-shadow: 0 4px 6px rgba(0,0,0,.1);
+}
+
+.document-card {
+    transition: transform 0.2s;
+}
+
+.document-card:hover {
+    transform: translateY(-5px);
+}
+
+.file-icon {
+    font-size: 2.5rem;
+    margin-bottom: 10px;
+}
+
+.pdf-icon { color: #e74c3c; }
+.document-icon { color: #3498db; }
+.spreadsheet-icon { color: #2ecc71; }
+.image-icon { color: #9b59b6; }
+.video-icon { color: #e67e22; }
+.other-icon { color: #95a5a6; }
+
+.flash-messages {
+    position: fixed;
+    top: 70px;
+    right: 20px;
+    z-index: 1000;
+    max-width: 300px;
+}
+
+/* Dashboard Styles */
+.analytics-card {
+    background-color: #f8f9fa;
+    border-left: 4px solid #007bff;
+}
+
+/* Document Viewer Styles */
+.document-viewer {
+    min-height: 400px;
+    background-color: #f8f9fa;
+    border: 1px solid #dee2e6;
+    border-radius: 0.25rem;
+    padding: 1rem;
+}
+
+/* Responsive Adjustments */
+@media (max-width: 768px) {
+    .card-body {
+        padding: 1rem;
+    }
+    
+    .btn-group {
+        display: flex;
+        flex-direction: column;
+    }
+    
+    .btn-group .btn {
+        margin-bottom: 0.25rem;
+        border-radius: 0.25rem !important;
+    }
+}

templates/admin.html

@@ -0,0 +1,123 @@
+{% extends "layout.html" %}
+
+{% block content %}
+<h2 class="mb-4"><i class="bi bi-shield-lock"></i> Admin Panel</h2>
+
+<div class="row">
+    <div class="col-md-4">
+        <div class="card mb-4">
+            <div class="card-header bg-primary text-white">
+                <h5 class="mb-0"><i class="bi bi-file-earmark-text"></i> Document Statistics</h5>
+            </div>
+            <div class="card-body">
+                <ul class="list-group list-group-flush">
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Total Documents
+                        <span class="badge bg-primary rounded-pill">{{ doc_stats.total_documents }}</span>
+                    </li>
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Total Storage Used
+                        <span class="badge bg-info rounded-pill">{{ (doc_stats.total_size / (1024*1024))|round(2) }} MB</span>
+                    </li>
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Active Contributors
+                        <span class="badge bg-success rounded-pill">{{ doc_stats.total_contributors }}</span>
+                    </li>
+                </ul>
+            </div>
+        </div>
+    </div>
+    
+    <div class="col-md-4">
+        <div class="card mb-4">
+            <div class="card-header bg-success text-white">
+                <h5 class="mb-0"><i class="bi bi-activity"></i> Activity Statistics</h5>
+            </div>
+            <div class="card-body">
+                <ul class="list-group list-group-flush">
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Total Actions
+                        <span class="badge bg-primary rounded-pill">{{ activity_stats.total_actions }}</span>
+                    </li>
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Active Users
+                        <span class="badge bg-info rounded-pill">{{ activity_stats.active_users }}</span>
+                    </li>
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Accessed Documents
+                        <span class="badge bg-success rounded-pill">{{ activity_stats.accessed_documents }}</span>
+                    </li>
+                </ul>
+            </div>
+        </div>
+    </div>
+    
+    <div class="col-md-4">
+        <div class="card mb-4">
+            <div class="card-header bg-warning text-dark">
+                <h5 class="mb-0"><i class="bi bi-gear"></i> System Actions</h5>
+            </div>
+            <div class="card-body">
+                <div class="d-grid gap-2">
+                    <button class="btn btn-outline-primary">
+                        <i class="bi bi-arrow-repeat"></i> Rebuild Search Index
+                    </button>
+                    <button class="btn btn-outline-warning">
+                        <i class="bi bi-trash"></i> Clear Expired Shares
+                    </button>
+                    <button class="btn btn-outline-danger">
+                        <i class="bi bi-exclamation-triangle"></i> System Maintenance
+                    </button>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
+<div class="card">
+    <div class="card-header bg-info text-white">
+        <h5 class="mb-0"><i class="bi bi-people"></i> User Management</h5>
+    </div>
+    <div class="card-body">
+        <div class="table-responsive">
+            <table class="table table-striped">
+                <thead>
+                    <tr>
+                        <th>ID</th>
+                        <th>Username</th>
+                        <th>Email</th>
+                        <th>Role</th>
+                        <th>Created</th>
+                        <th>Actions</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {% for user in users %}
+                    <tr>
+                        <td>{{ user.id }}</td>
+                        <td>{{ user.username }}</td>
+                        <td>{{ user.email }}</td>
+                        <td>
+                            <span class="badge bg-{{ 'danger' if user.role == 'admin' else 'primary' }}">
+                                {{ user.role }}
+                            </span>
+                        </td>
+                        <td>{{ user.created_at.split(' ')[0] }}</td>
+                        <td>
+                            <div class="btn-group btn-group-sm">
+                                <button class="btn btn-outline-primary">
+                                    <i class="bi bi-pencil"></i> Edit
+                                </button>
+                                <button class="btn btn-outline-danger" {% if user.role == 'admin' %}disabled{% endif %}>
+                                    <i class="bi bi-trash"></i> Delete
+                                </button>
+                            </div>
+                        </td>
+                    </tr>
+                    {% endfor %}
+                </tbody>
+            </table>
+        </div>
+    </div>
+</div>
+{% endblock %}

templates/dashboard.html

@@ -0,0 +1,194 @@
+{% extends "layout.html" %}
+
+{% block content %}
+<h2 class="mb-4"><i class="bi bi-speedometer2"></i> Dashboard</h2>
+
+<div class="row">
+    <!-- Category Summary -->
+    <div class="col-md-6 mb-4">
+        <div class="card h-100">
+            <div class="card-header bg-primary text-white">
+                <h5 class="mb-0"><i class="bi bi-folder"></i> Document Categories</h5>
+            </div>
+            <div class="card-body">
+                {% if category_counts %}
+                <div class="row">
+                    {% for category in category_counts %}
+                    <div class="col-md-6 mb-3">
+                        <div class="card border-0 shadow-sm">
+                            <div class="card-body">
+                                <div class="d-flex justify-content-between align-items-center">
+                                    <div>
+                                        <h6 class="mb-0">{{ category.category|capitalize }}</h6>
+                                        <small class="text-muted">{{ category.count }} document{% if category.count != 1 %}s{% endif %}</small>
+                                    </div>
+                                    <a href="{{ url_for('files', category=category.category) }}" class="btn btn-sm btn-outline-primary">
+                                        <i class="bi bi-arrow-right"></i>
+                                    </a>
+                                </div>
+                            </div>
+                        </div>
+                    </div>
+                    {% endfor %}
+                </div>
+                {% else %}
+                <div class="alert alert-info">
+                    <i class="bi bi-info-circle"></i> No documents found. Upload your first document to get started!
+                </div>
+                {% endif %}
+                <div class="text-center mt-3">
+                    <a href="{{ url_for('files') }}" class="btn btn-primary">
+                        <i class="bi bi-table"></i> View All Documents
+                    </a>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <!-- Quick Actions -->
+    <div class="col-md-6 mb-4">
+        <div class="card h-100">
+            <div class="card-header bg-success text-white">
+                <h5 class="mb-0"><i class="bi bi-lightning"></i> Quick Actions</h5>
+            </div>
+            <div class="card-body">
+                <div class="row">
+                    <div class="col-6 mb-3">
+                        <a href="{{ url_for('upload') }}" class="btn btn-outline-success w-100 h-100 d-flex flex-column justify-content-center align-items-center p-4">
+                            <i class="bi bi-upload fs-2 mb-2"></i>
+                            <span>Upload Document</span>
+                        </a>
+                    </div>
+                    <div class="col-6 mb-3">
+                        <a href="{{ url_for('files') }}" class="btn btn-outline-primary w-100 h-100 d-flex flex-column justify-content-center align-items-center p-4">
+                            <i class="bi bi-table fs-2 mb-2"></i>
+                            <span>View Files</span>
+                        </a>
+                    </div>
+                    <div class="col-6 mb-3">
+                        <a href="{{ url_for('files', category='admin') }}" class="btn btn-outline-secondary w-100 h-100 d-flex flex-column justify-content-center align-items-center p-4">
+                            <i class="bi bi-briefcase fs-2 mb-2"></i>
+                            <span>Admin Files</span>
+                        </a>
+                    </div>
+                    <div class="col-6 mb-3">
+                        <a href="{{ url_for('files', category='accounting') }}" class="btn btn-outline-info w-100 h-100 d-flex flex-column justify-content-center align-items-center p-4">
+                            <i class="bi bi-calculator fs-2 mb-2"></i>
+                            <span>Accounting Files</span>
+                        </a>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
+<div class="row">
+    <!-- Recent Documents -->
+    <div class="col-md-6 mb-4">
+        <div class="card h-100">
+            <div class="card-header bg-info text-white">
+                <h5 class="mb-0"><i class="bi bi-clock-history"></i> Recent Documents</h5>
+            </div>
+            <div class="card-body p-0">
+                {% if recent_documents %}
+                <div class="list-group list-group-flush">
+                    {% for doc in recent_documents %}
+                    <a href="{{ url_for('view_document', document_id=doc.id) }}" class="list-group-item list-group-item-action">
+                        <div class="d-flex w-100 justify-content-between align-items-center">
+                            <div>
+                                <div class="d-flex align-items-center">
+                                    {% if doc.file_type == 'pdf' %}
+                                    <i class="bi bi-file-earmark-pdf text-danger me-2"></i>
+                                    {% elif doc.file_type == 'document' %}
+                                    <i class="bi bi-file-earmark-word text-primary me-2"></i>
+                                    {% elif doc.file_type == 'spreadsheet' %}
+                                    <i class="bi bi-file-earmark-excel text-success me-2"></i>
+                                    {% elif doc.file_type == 'image' %}
+                                    <i class="bi bi-file-earmark-image text-info me-2"></i>
+                                    {% elif doc.file_type == 'video' %}
+                                    <i class="bi bi-file-earmark-play text-warning me-2"></i>
+                                    {% else %}
+                                    <i class="bi bi-file-earmark text-secondary me-2"></i>
+                                    {% endif %}
+                                    <h6 class="mb-0">{{ doc.custom_filename }}</h6>
+                                </div>
+                                <small class="text-muted">
+                                    <span class="badge bg-secondary">{{ doc.category|capitalize }}</span>
+                                    {{ (doc.file_size / 1024)|round(1) }} KB
+                                </small>
+                            </div>
+                            <small class="text-muted">{{ doc.created_at.split(' ')[0] }}</small>
+                        </div>
+                    </a>
+                    {% endfor %}
+                </div>
+                {% else %}
+                <div class="alert alert-info m-3">
+                    <i class="bi bi-info-circle"></i> No documents found. Upload your first document to get started!
+                </div>
+                {% endif %}
+            </div>
+            {% if recent_documents %}
+            <div class="card-footer text-center">
+                <a href="{{ url_for('files') }}" class="btn btn-sm btn-outline-info">View All Documents</a>
+            </div>
+            {% endif %}
+        </div>
+    </div>
+
+    <!-- Analytics (Admin Only) -->
+    {% if session.role == 'admin' and analytics %}
+    <div class="col-md-6 mb-4">
+        <div class="card h-100">
+            <div class="card-header bg-warning text-dark">
+                <h5 class="mb-0"><i class="bi bi-graph-up"></i> Analytics Overview</h5>
+            </div>
+            <div class="card-body">
+                <h6>Most Viewed Documents</h6>
+                <div class="table-responsive">
+                    <table class="table table-sm table-striped">
+                        <thead>
+                            <tr>
+                                <th>Document</th>
+                                <th>Views</th>
+                            </tr>
+                        </thead>
+                        <tbody>
+                            {% for doc in analytics %}
+                            <tr>
+                                <td>{{ doc.custom_filename }}</td>
+                                <td>{{ doc.view_count }}</td>
+                            </tr>
+                            {% endfor %}
+                        </tbody>
+                    </table>
+                </div>
+                
+                {% if user_activity %}
+                <h6 class="mt-4">Most Active Users</h6>
+                <div class="table-responsive">
+                    <table class="table table-sm table-striped">
+                        <thead>
+                            <tr>
+                                <th>User</th>
+                                <th>Actions</th>
+                            </tr>
+                        </thead>
+                        <tbody>
+                            {% for user in user_activity %}
+                            <tr>
+                                <td>{{ user.username }}</td>
+                                <td>{{ user.action_count }}</td>
+                            </tr>
+                            {% endfor %}
+                        </tbody>
+                    </table>
+                </div>
+                {% endif %}
+            </div>
+        </div>
+    </div>
+    {% endif %}
+</div>
+{% endblock %}

templates/edit_document.html

@@ -0,0 +1,77 @@
+{% extends "layout.html" %}
+
+{% block content %}
+<h2 class="mb-4"><i class="bi bi-pencil-square"></i> Edit Document</h2>
+
+<div class="row">
+    <div class="col-md-8">
+        <div class="card">
+            <div class="card-header bg-primary text-white">
+                <h5 class="mb-0">Edit Document Details</h5>
+            </div>
+            <div class="card-body">
+                <form method="post" action="{{ url_for('edit_document', document_id=document.id) }}">
+                    <div class="mb-3">
+                        <label for="custom_filename" class="form-label">Document Name</label>
+                        <input type="text" class="form-control" id="custom_filename" name="custom_filename" 
+                               value="{{ document.custom_filename }}" required>
+                    </div>
+                    
+                    <div class="mb-3">
+                        <label for="category" class="form-label">Category</label>
+                        <select class="form-select" id="category" name="category" required>
+                            {% for category in categories %}
+                            <option value="{{ category }}" {% if category == document.category %}selected{% endif %}>
+                                {{ category|capitalize }}
+                            </option>
+                            {% endfor %}
+                        </select>
+                    </div>
+                    
+                    <div class="mb-3">
+                        <label class="form-label">Visibility</label>
+                        <div class="form-check">
+                            <input class="form-check-input" type="radio" name="visibility" id="private" value="private"
+                                  {% if document.visibility == 'private' %}checked{% endif %}>
+                            <label class="form-check-label" for="private">
+                                <i class="bi bi-lock"></i> Private (Only you can access)
+                            </label>
+                        </div>
+                        <div class="form-check">
+                            <input class="form-check-input" type="radio" name="visibility" id="public" value="public"
+                                  {% if document.visibility == 'public' %}checked{% endif %}>
+                            <label class="form-check-label" for="public">
+                                <i class="bi bi-globe"></i> Public (Anyone can access)
+                            </label>
+                        </div>
+                    </div>
+                    
+                    <div class="d-flex justify-content-between">
+                        <a href="{{ url_for('view_document', document_id=document.id) }}" class="btn btn-secondary">
+                            <i class="bi bi-x-circle"></i> Cancel
+                        </a>
+                        <button type="submit" class="btn btn-primary">
+                            <i class="bi bi-save"></i> Save Changes
+                        </button>
+                    </div>
+                </form>
+            </div>
+        </div>
+    </div>
+    
+    <div class="col-md-4">
+        <div class="card">
+            <div class="card-header bg-info text-white">
+                <h5 class="mb-0"><i class="bi bi-info-circle"></i> Document Information</h5>
+            </div>
+            <div class="card-body">
+                <p><strong>Original Filename:</strong> {{ document.original_filename }}</p>
+                <p><strong>File Type:</strong> {{ document.file_type|capitalize }}</p>
+                <p><strong>File Size:</strong> {{ (document.file_size / 1024)|round(1) }} KB</p>
+                <p><strong>Uploaded:</strong> {{ document.created_at.split(' ')[0] }}</p>
+                <p><strong>Last Modified:</strong> {{ document.updated_at.split(' ')[0] }}</p>
+            </div>
+        </div>
+    </div>
+</div>
+{% endblock %}

templates/error.html

@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Document Management System - Error</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/css/bootstrap.min.css" rel="stylesheet">
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.8.0/font/bootstrap-icons.css">
+    <link rel="stylesheet" href="{{ url_for('static', filename='styles.css') }}">
+</head>
+<body>
+    <!-- Navigation -->
+    <nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
+        <div class="container">
+            <a class="navbar-brand" href="{{ url_for('index') }}">
+                <i class="bi bi-folder2-open"></i> DMS
+            </a>
+        </div>
+    </nav>
+
+    <!-- Main Content -->
+    <div class="container mt-5 pt-5">
+        <div class="row justify-content-center">
+            <div class="col-md-8 text-center">
+                <div class="card">
+                    <div class="card-body">
+                        <h1 class="display-1 text-danger">{{ error_code }}</h1>
+                        <h2 class="mb-4">{{ error_message }}</h2>
+                        <p class="lead">Sorry, something went wrong.</p>
+                        <a href="{{ url_for('index') }}" class="btn btn-primary mt-3">
+                            <i class="bi bi-house"></i> Return to Home
+                        </a>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+
+    <!-- Footer -->
+    <footer class="bg-dark text-white py-4 mt-5">
+        <div class="container text-center">
+            <p>Document Management System</p>
+        </div>
+    </footer>
+
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/js/bootstrap.bundle.min.js"></script>
+    <script src="{{ url_for('static', filename='scripts.js') }}"></script>
+</body>
+</html>

templates/files.html

@@ -0,0 +1,145 @@
+{% extends "layout.html" %}
+
+{% block content %}
+<div class="row mb-3">
+    <div class="col-md-6">
+        <h2><i class="bi bi-table"></i> Files</h2>
+    </div>
+    <div class="col-md-6 text-end">
+        <a href="{{ url_for('upload') }}" class="btn btn-success">
+            <i class="bi bi-upload"></i> Upload New Document
+        </a>
+    </div>
+</div>
+
+<div class="card mb-4">
+    <div class="card-header bg-primary text-white d-flex justify-content-between align-items-center">
+        <h5 class="mb-0"><i class="bi bi-file-earmark"></i> Document Library</h5>
+        <form class="d-flex" action="{{ url_for('files') }}" method="get">
+            <select name="category" class="form-select form-select-sm me-2" style="width: 150px;" onchange="this.form.submit()">
+                <option value="all" {% if selected_category == 'all' %}selected{% endif %}>All Categories</option>
+                {% for category in categories %}
+                <option value="{{ category }}" {% if selected_category == category %}selected{% endif %}>
+                    {{ category|capitalize }}
+                </option>
+                {% endfor %}
+            </select>
+            <div class="input-group">
+                <input type="text" class="form-control form-control-sm" placeholder="Search files..." name="search" value="{{ search_query }}">
+                <button class="btn btn-outline-light btn-sm" type="submit">
+                    <i class="bi bi-search"></i>
+                </button>
+            </div>
+        </form>
+    </div>
+    <div class="card-body p-0">
+        <div class="table-responsive">
+            <table class="table table-striped table-hover mb-0">
+                <thead class="table-light">
+                    <tr>
+                        <th>Name</th>
+                        <th>Category</th>
+                        <th>Type</th>
+                        <th>Size</th>
+                        <th>Uploaded</th>
+                        <th>Visibility</th>
+                        <th>Actions</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {% if documents %}
+                        {% for doc in documents %}
+                        <tr>
+                            <td>
+                                <div class="d-flex align-items-center">
+                                    {% if doc.file_type == 'pdf' %}
+                                    <i class="bi bi-file-earmark-pdf text-danger me-2"></i>
+                                    {% elif doc.file_type == 'document' %}
+                                    <i class="bi bi-file-earmark-word text-primary me-2"></i>
+                                    {% elif doc.file_type == 'spreadsheet' %}
+                                    <i class="bi bi-file-earmark-excel text-success me-2"></i>
+                                    {% elif doc.file_type == 'image' %}
+                                    <i class="bi bi-file-earmark-image text-info me-2"></i>
+                                    {% elif doc.file_type == 'video' %}
+                                    <i class="bi bi-file-earmark-play text-warning me-2"></i>
+                                    {% else %}
+                                    <i class="bi bi-file-earmark text-secondary me-2"></i>
+                                    {% endif %}
+                                    <span>{{ doc.custom_filename }}</span>
+                                </div>
+                            </td>
+                            <td><span class="badge bg-secondary">{{ doc.category|capitalize }}</span></td>
+                            <td>{{ doc.file_type|capitalize }}</td>
+                            <td>{{ (doc.file_size / 1024)|round(1) }} KB</td>
+                            <td>{{ doc.created_at.split(' ')[0] }}</td>
+                            <td>
+                                {% if doc.visibility == 'public' %}
+                                <span class="badge bg-success">Public</span>
+                                {% else %}
+                                <span class="badge bg-warning text-dark">Private</span>
+                                {% endif %}
+                            </td>
+                            <td>
+                                <div class="btn-group btn-group-sm">
+                                    <a href="{{ url_for('view_document', document_id=doc.id) }}" class="btn btn-outline-primary" title="View">
+                                        <i class="bi bi-eye"></i>
+                                    </a>
+                                    <a href="{{ url_for('edit_document', document_id=doc.id) }}" class="btn btn-outline-secondary" title="Edit">
+                                        <i class="bi bi-pencil"></i>
+                                    </a>
+                                    <a href="{{ url_for('share_document', document_id=doc.id) }}" class="btn btn-outline-info" title="Share">
+                                        <i class="bi bi-share"></i>
+                                    </a>
+                                    <a href="{{ url_for('download_document', document_id=doc.id) }}" class="btn btn-outline-success" title="Download">
+                                        <i class="bi bi-download"></i>
+                                    </a>
+                                    <a href="{{ url_for('delete_document', document_id=doc.id) }}" class="btn btn-outline-danger" 
+                                       onclick="return confirm('Are you sure you want to delete this document?')" title="Delete">
+                                        <i class="bi bi-trash"></i>
+                                    </a>
+                                </div>
+                            </td>
+                        </tr>
+                        {% endfor %}
+                    {% else %}
+                        <tr>
+                            <td colspan="7" class="text-center py-4">
+                                <div class="alert alert-info mb-0">
+                                    <i class="bi bi-info-circle"></i> 
+                                    {% if search_query %}
+                                        No documents found matching your search criteria.
+                                    {% elif selected_category != 'all' %}
+                                        No documents found in the selected category.
+                                    {% else %}
+                                        No documents found. Upload your first document to get started!
+                                    {% endif %}
+                                </div>
+                            </td>
+                        </tr>
+                    {% endif %}
+                </tbody>
+            </table>
+        </div>
+    </div>
+</div>
+
+{% if pagination and pagination.pages > 1 %}
+<nav aria-label="Document pagination">
+    <ul class="pagination justify-content-center">
+        <li class="page-item {% if pagination.page == 1 %}disabled{% endif %}">
+            <a class="page-link" href="{{ url_for('files', page=pagination.page-1, search=search_query, category=selected_category) }}">Previous</a>
+        </li>
+        
+        {% for p in range(1, pagination.pages + 1) %}
+        <li class="page-item {% if pagination.page == p %}active{% endif %}">
+            <a class="page-link" href="{{ url_for('files', page=p, search=search_query, category=selected_category) }}">{{ p }}</a>
+        </li>
+        {% endfor %}
+        
+        <li class="page-item {% if pagination.page == pagination.pages %}disabled{% endif %}">
+            <a class="page-link" href="{{ url_for('files', page=pagination.page+1, search=search_query, category=selected_category) }}">Next</a>
+        </li>
+    </ul>
+</nav>
+{% endif %}
+{% endblock %}

templates/index.html

@@ -0,0 +1,17 @@
+{% extends "layout.html" %}
+
+{% block content %}
+<div class="row justify-content-center">
+    <div class="col-md-8 text-center">
+        <div class="card mt-5">
+            <div class="card-body">
+                <h1 class="display-4 mb-4">Document Management System</h1>
+                <p class="lead">A secure platform for managing, sharing, and collaborating on documents.</p>
+                <hr class="my-4">
+                <p>Please login to access your documents and start managing your files.</p>
+                <a href="{{ url_for('login') }}" class="btn btn-primary btn-lg">Login</a>
+            </div>
+        </div>
+    </div>
+</div>
+{% endblock %}

templates/layout.html

@@ -0,0 +1,92 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Document Management System</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/css/bootstrap.min.css" rel="stylesheet">
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.8.0/font/bootstrap-icons.css">
+    <link rel="stylesheet" href="{{ url_for('static', filename='styles.css') }}">
+</head>
+<body>
+    <!-- Navigation -->
+    <nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
+        <div class="container">
+            <a class="navbar-brand" href="{{ url_for('index') }}">
+                <i class="bi bi-folder2-open"></i> DMS
+            </a>
+            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav">
+                <span class="navbar-toggler-icon"></span>
+            </button>
+            <div class="collapse navbar-collapse" id="navbarNav">
+                <ul class="navbar-nav me-auto">
+                    {% if session.user_id %}
+                    <li class="nav-item">
+                        <a class="nav-link" href="{{ url_for('dashboard') }}">Dashboard</a>
+                    </li>
+                    <li class="nav-item">
+                        <a class="nav-link" href="{{ url_for('files') }}">Files</a>
+                    </li>
+                    <li class="nav-item">
+                        <a class="nav-link" href="{{ url_for('upload') }}">Upload</a>
+                    </li>
+                    {% if session.role == 'admin' %}
+                    <li class="nav-item">
+                        <a class="nav-link" href="{{ url_for('admin_panel') }}">Admin</a>
+                    </li>
+                    {% endif %}
+                    {% endif %}
+                </ul>
+                <ul class="navbar-nav">
+                    {% if session.user_id %}
+                    <li class="nav-item dropdown">
+                        <a class="nav-link dropdown-toggle" href="#" id="userDropdown" role="button" data-bs-toggle="dropdown">
+                            <i class="bi bi-person-circle"></i> {{ session.username }}
+                        </a>
+                        <ul class="dropdown-menu dropdown-menu-end">
+                            <li><a class="dropdown-item" href="{{ url_for('logout') }}">Logout</a></li>
+                        </ul>
+                    </li>
+                    {% else %}
+                    <li class="nav-item">
+                        <a class="nav-link" href="{{ url_for('login') }}">Login</a>
+                    </li>
+                    {% endif %}
+                </ul>
+            </div>
+        </div>
+    </nav>
+
+    <!-- Flash Messages -->
+    <div class="flash-messages">
+        {% for category, message in get_flashed_messages(with_categories=true) %}
+            {% set alert_class = 'alert-info' %}
+            {% if category == 'success' %}
+                {% set alert_class = 'alert-success' %}
+            {% elif category == 'error' %}
+                {% set alert_class = 'alert-danger' %}
+            {% endif %}
+            <div class="alert {{ alert_class }} alert-dismissible fade show">
+                {{ message }}
+                <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
+            </div>
+        {% endfor %}
+    </div>
+
+    <!-- Main Content -->
+    <div class="container mt-4">
+        {% block content %}{% endblock %}
+    </div>
+
+    <!-- Footer -->
+    <footer class="bg-dark text-white py-4 mt-5">
+        <div class="container text-center">
+            <p>Document Management System</p>
+        </div>
+    </footer>
+
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha1/dist/js/bootstrap.bundle.min.js"></script>
+    <script src="{{ url_for('static', filename='scripts.js') }}"></script>
+    {% block scripts %}{% endblock %}
+</body>
+</html>

templates/login.html

@@ -0,0 +1,33 @@
+{% extends "layout.html" %}
+
+{% block content %}
+<div class="row justify-content-center">
+    <div class="col-md-6">
+        <div class="card mt-5">
+            <div class="card-header bg-primary text-white">
+                <h4 class="mb-0"><i class="bi bi-person"></i> Login</h4>
+            </div>
+            <div class="card-body">
+                <form method="post" action="{{ url_for('login') }}">
+                    <div class="mb-3">
+                        <label for="username" class="form-label">Username</label>
+                        <input type="text" class="form-control" id="username" name="username" required>
+                    </div>
+                    <div class="mb-3">
+                        <label for="password" class="form-label">Password</label>
+                        <input type="password" class="form-control" id="password" name="password" required>
+                    </div>
+                    <div class="d-grid">
+                        <button type="submit" class="btn btn-primary">Login</button>
+                    </div>
+                </form>
+                <div class="mt-3 text-center">
+                    <!-- <p class="text-muted">Demo Accounts:</p>
+                    <p><small>Admin: username: <strong>admin</strong>, password: <strong>admin123</strong></small></p>
+                    <p><small>User: username: <strong>user</strong>, password: <strong>user123</strong></small></p> -->
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+{% endblock %}

templates/share_document.html

@@ -0,0 +1,163 @@
+{% extends "layout.html" %}
+
+{% block content %}
+<div class="row mb-3">
+    <div class="col-md-8">
+        <h2><i class="bi bi-share"></i> Share Document: {{ document.original_filename }}</h2>
+    </div>
+    <div class="col-md-4 text-end">
+        <a href="{{ url_for('view_document', document_id=document.id) }}" class="btn btn-secondary">
+            <i class="bi bi-arrow-left"></i> Back to Document
+        </a>
+    </div>
+</div>
+
+<div class="row">
+    <div class="col-md-6">
+        <div class="card mb-4">
+            <div class="card-header bg-primary text-white">
+                <h5 class="mb-0"><i class="bi bi-person-plus"></i> Share with User</h5>
+            </div>
+            <div class="card-body">
+                <form method="post" action="{{ url_for('share_document', document_id=document.id) }}">
+                    <input type="hidden" name="share_type" value="user">
+                    <div class="mb-3">
+                        <label for="username" class="form-label">Username</label>
+                        <select class="form-select" id="username" name="username" required>
+                            <option value="" selected disabled>Select a user</option>
+                            {% for user in users %}
+                            <option value="{{ user.username }}">{{ user.username }}</option>
+                            {% endfor %}
+                        </select>
+                    </div>
+                    <div class="d-grid">
+                        <button type="submit" class="btn btn-primary">
+                            <i class="bi bi-share"></i> Share with User
+                        </button>
+                    </div>
+                </form>
+            </div>
+        </div>
+    </div>
+    
+    <div class="col-md-6">
+        <div class="card mb-4">
+            <div class="card-header bg-info text-white">
+                <h5 class="mb-0"><i class="bi bi-link"></i> Create Shareable Link</h5>
+            </div>
+            <div class="card-body">
+                <form method="post" action="{{ url_for('share_document', document_id=document.id) }}">
+                    <input type="hidden" name="share_type" value="link">
+                    <div class="mb-3">
+                        <label for="expiry" class="form-label">Link Expiry</label>
+                        <select class="form-select" id="expiry" name="expiry">
+                            <option value="1">1 day</option>
+                            <option value="7" selected>7 days</option>
+                            <option value="30">30 days</option>
+                            <option value="90">90 days</option>
+                        </select>
+                    </div>
+                    <div class="d-grid">
+                        <button type="submit" class="btn btn-info">
+                            <i class="bi bi-link"></i> Generate Link
+                        </button>
+                    </div>
+                </form>
+            </div>
+        </div>
+    </div>
+</div>
+
+<div class="card">
+    <div class="card-header bg-success text-white">
+        <h5 class="mb-0"><i class="bi bi-people"></i> Current Shares</h5>
+    </div>
+    <div class="card-body">
+        {% if shares %}
+        <div class="table-responsive">
+            <table class="table table-striped">
+                <thead>
+                    <tr>
+                        <th>Type</th>
+                        <th>Shared With</th>
+                        <th>Date Shared</th>
+                        <th>Expiry</th>
+                        <th>Actions</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {% for share in shares %}
+                    <tr>
+                        <td>
+                            {% if share.shared_with %}
+                            <span class="badge bg-primary"><i class="bi bi-person"></i> User</span>
+                            {% elif share.share_link %}
+                            <span class="badge bg-info"><i class="bi bi-link"></i> Link</span>
+                            {% endif %}
+                        </td>
+                        <td>
+                            {% if share.shared_with %}
+                            {{ share.username }}
+                            {% elif share.share_link %}
+                            <div class="input-group input-group-sm">
+                                <input type="text" class="form-control form-control-sm" value="{{ request.host_url }}shared/{{ share.share_link }}" readonly id="link-{{ share.id }}">
+                                <button class="btn btn-outline-secondary" type="button" onclick="copyLink('link-{{ share.id }}')">
+                                    <i class="bi bi-clipboard"></i>
+                                </button>
+                            </div>
+                            {% endif %}
+                        </td>
+                        <td>{{ share.created_at.split(' ')[0] }}</td>
+                        <td>
+                            {% if share.expires_at %}
+                            {{ share.expires_at.split(' ')[0] }}
+                            {% else %}
+                            Never
+                            {% endif %}
+                        </td>
+                        <td>
+                            <a href="#" class="btn btn-sm btn-danger">
+                                <i class="bi bi-x-circle"></i> Revoke
+                            </a>
+                        </td>
+                    </tr>
+                    {% endfor %}
+                </tbody>
+            </table>
+        </div>
+        {% else %}
+        <div class="alert alert-info">
+            <i class="bi bi-info-circle"></i> This document hasn't been shared yet.
+        </div>
+        {% endif %}
+    </div>
+</div>
+{% endblock %}
+
+{% block scripts %}
+<script>
+    function copyLink(elementId) {
+        var copyText = document.getElementById(elementId);
+        copyText.select();
+        copyText.setSelectionRange(0, 99999);
+        navigator.clipboard.writeText(copyText.value);
+        
+        // Show a temporary tooltip
+        var tooltip = document.createElement("div");
+        tooltip.innerHTML = "Copied!";
+        tooltip.style.position = "fixed";
+        tooltip.style.backgroundColor = "#4CAF50";
+        tooltip.style.color = "white";
+        tooltip.style.padding = "5px 10px";
+        tooltip.style.borderRadius = "5px";
+        tooltip.style.zIndex = "1000";
+        tooltip.style.top = (event.clientY - 30) + "px";
+        tooltip.style.left = event.clientX + "px";
+        document.body.appendChild(tooltip);
+        
+        setTimeout(function() {
+            document.body.removeChild(tooltip);
+        }, 2000);
+    }
+</script>
+{% endblock %}

templates/shared_view.html

@@ -0,0 +1,140 @@
+{% extends "layout.html" %}
+
+{% block content %}
+<div class="row mb-3">
+    <div class="col-md-12">
+        <div class="alert alert-info">
+            <i class="bi bi-info-circle"></i> You are viewing a shared document. 
+            {% if not session.user_id %}
+            <a href="{{ url_for('login') }}" class="alert-link">Login</a> to access more features.
+            {% endif %}
+        </div>
+    </div>
+</div>
+
+<div class="row">
+    <div class="col-md-8">
+        <div class="card mb-4">
+            <div class="card-header bg-primary text-white">
+                <h5 class="mb-0"><i class="bi bi-file-earmark"></i> {{ document.original_filename }}</h5>
+            </div>
+            <div class="card-body">
+                <div class="document-viewer">
+                    {% if document.file_type == 'pdf' %}
+                    <div class="ratio ratio-16x9">
+                        <iframe src="{{ url_for('download_shared', share_token=share_token) }}" allowfullscreen></iframe>
+                    </div>
+                    {% elif document.file_type == 'image' %}
+                    <img src="{{ url_for('download_shared', share_token=share_token) }}" class="img-fluid" alt="{{ document.original_filename }}">
+                    {% elif document.file_type == 'video' %}
+                    <div class="ratio ratio-16x9">
+                        <video controls>
+                            <source src="{{ url_for('download_shared', share_token=share_token) }}" type="video/mp4">
+                            Your browser does not support the video tag.
+                        </video>
+                    </div>
+                    {% else %}
+                    <div class="alert alert-info">
+                        <i class="bi bi-info-circle"></i> Preview not available for this file type. Please download the file to view its contents.
+                    </div>
+                    {% endif %}
+                </div>
+                
+                <div class="mt-3">
+                    <a href="{{ url_for('download_shared', share_token=share_token) }}" class="btn btn-primary">
+                        <i class="bi bi-download"></i> Download
+                    </a>
+                </div>
+            </div>
+        </div>
+    </div>
+    
+    <div class="col-md-4">
+        <div class="card mb-4">
+            <div class="card-header bg-secondary text-white">
+                <h5 class="mb-0"><i class="bi bi-info-circle"></i> Document Information</h5>
+            </div>
+            <div class="card-body">
+                <ul class="list-group list-group-flush">
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        File Type
+                        <span class="badge bg-primary rounded-pill">{{ document.file_type }}</span>
+                    </li>
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Size
+                        <span class="badge bg-secondary rounded-pill">{{ (document.file_size / 1024)|round(1) }} KB</span>
+                    </li>
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Uploaded
+                        <span class="badge bg-info rounded-pill">{{ document.created_at.split(' ')[0] }}</span>
+                    </li>
+                </ul>
+            </div>
+        </div>
+        
+        <div class="card">
+            <div class="card-header bg-success text-white">
+                <h5 class="mb-0"><i class="bi bi-share"></i> Sharing Options</h5>
+            </div>
+            <div class="card-body">
+                <p>This document has been shared with you via a secure link.</p>
+                
+                <div class="input-group mb-3">
+                    <input type="text" class="form-control" value="{{ request.url }}" readonly id="share-link">
+                    <button class="btn btn-outline-secondary" type="button" onclick="copyLink('share-link')">
+                        <i class="bi bi-clipboard"></i> Copy
+                    </button>
+                </div>
+                
+                <div class="d-grid gap-2">
+                    <button class="btn btn-outline-primary" onclick="shareViaEmail()">
+                        <i class="bi bi-envelope"></i> Share via Email
+                    </button>
+                    <button class="btn btn-outline-success" onclick="shareViaWhatsApp()">
+                        <i class="bi bi-whatsapp"></i> Share via WhatsApp
+                    </button>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+{% endblock %}
+
+{% block scripts %}
+<script>
+    function copyLink(elementId) {
+        var copyText = document.getElementById(elementId);
+        copyText.select();
+        copyText.setSelectionRange(0, 99999);
+        navigator.clipboard.writeText(copyText.value);
+        
+        // Show a temporary tooltip
+        var tooltip = document.createElement("div");
+        tooltip.innerHTML = "Copied!";
+        tooltip.style.position = "fixed";
+        tooltip.style.backgroundColor = "#4CAF50";
+        tooltip.style.color = "white";
+        tooltip.style.padding = "5px 10px";
+        tooltip.style.borderRadius = "5px";
+        tooltip.style.zIndex = "1000";
+        tooltip.style.top = (event.clientY - 30) + "px";
+        tooltip.style.left = event.clientX + "px";
+        document.body.appendChild(tooltip);
+        
+        setTimeout(function() {
+            document.body.removeChild(tooltip);
+        }, 2000);
+    }
+    
+    function shareViaEmail() {
+        var subject = "Shared Document: {{ document.original_filename }}";
+        var body = "I'm sharing a document with you: {{ document.original_filename }}\\n\\nYou can access it here: " + window.location.href;
+        window.location.href = "mailto:?subject=" + encodeURIComponent(subject) + "&body=" + encodeURIComponent(body);
+    }
+    
+    function shareViaWhatsApp() {
+        var text = "I'm sharing a document with you: {{ document.original_filename }}\\n\\nYou can access it here: " + window.location.href;
+        window.open("https://wa.me/?text=" + encodeURIComponent(text), "_blank");
+    }
+</script>
+{% endblock %}

templates/upload.html

@@ -0,0 +1,98 @@
+{% extends "layout.html" %}
+
+{% block content %}
+<h2 class="mb-4"><i class="bi bi-upload"></i> Upload Document</h2>
+
+<div class="row">
+    <div class="col-md-8">
+        <div class="card">
+            <div class="card-header bg-success text-white">
+                <h5 class="mb-0">Upload New Document</h5>
+            </div>
+            <div class="card-body">
+                <form method="post" action="{{ url_for('upload') }}" enctype="multipart/form-data">
+                    <div class="mb-3">
+                        <label for="file" class="form-label">Select File</label>
+                        <input type="file" class="form-control" id="file" name="file" required>
+                        <div class="form-text">
+                            Allowed file types: PDF, DOCX, XLSX, JPG, PNG, MP4, TXT
+                        </div>
+                    </div>
+                    
+                    <div class="mb-3">
+                        <label for="custom_filename" class="form-label">Custom File Name (Optional)</label>
+                        <input type="text" class="form-control" id="custom_filename" name="custom_filename" placeholder="Enter a custom name for this file">
+                        <div class="form-text">
+                            If left blank, the original filename will be used
+                        </div>
+                    </div>
+                    
+                    <div class="mb-3">
+                        <label for="category" class="form-label">Category</label>
+                        <select class="form-select" id="category" name="category" required>
+                            {% for category in categories %}
+                            <option value="{{ category }}" {% if category == 'general' %}selected{% endif %}>
+                                {{ category|capitalize }}
+                            </option>
+                            {% endfor %}
+                        </select>
+                    </div>
+                    
+                    <div class="mb-3">
+                        <label class="form-label">Visibility</label>
+                        <div class="form-check">
+                            <input class="form-check-input" type="radio" name="visibility" id="private" value="private" checked>
+                            <label class="form-check-label" for="private">
+                                <i class="bi bi-lock"></i> Private (Only you can access)
+                            </label>
+                        </div>
+                        <div class="form-check">
+                            <input class="form-check-input" type="radio" name="visibility" id="public" value="public">
+                            <label class="form-check-label" for="public">
+                                <i class="bi bi-globe"></i> Public (Anyone can access)
+                            </label>
+                        </div>
+                    </div>
+                    
+                    <div class="d-grid">
+                        <button type="submit" class="btn btn-success">
+                            <i class="bi bi-upload"></i> Upload Document
+                        </button>
+                    </div>
+                </form>
+            </div>
+        </div>
+    </div>
+    
+    <div class="col-md-4">
+        <div class="card">
+            <div class="card-header bg-info text-white">
+                <h5 class="mb-0"><i class="bi bi-info-circle"></i> Information</h5>
+            </div>
+            <div class="card-body">
+                <h6>File Size Limits</h6>
+                <p>Maximum file size: 16MB</p>
+                
+                <h6>Supported File Types</h6>
+                <ul>
+                    <li>Documents: PDF, DOCX, TXT</li>
+                    <li>Spreadsheets: XLSX</li>
+                    <li>Images: JPG, PNG</li>
+                    <li>Videos: MP4</li>
+                </ul>
+                
+                <h6>Categories</h6>
+                <ul>
+                    <li><strong>Admin:</strong> Administrative documents</li>
+                    <li><strong>Accounting:</strong> Financial documents</li>
+                    <li><strong>HR:</strong> Human resources documents</li>
+                    <li><strong>Marketing:</strong> Marketing materials</li>
+                    <li><strong>Legal:</strong> Legal documents</li>
+                    <li><strong>General:</strong> General purpose documents</li>
+                    <li><strong>Other:</strong> Miscellaneous documents</li>
+                </ul>
+            </div>
+        </div>
+    </div>
+</div>
+{% endblock %}

templates/view_document.html

@@ -0,0 +1,160 @@
+{% extends "layout.html" %}
+
+{% block content %}
+<div class="row mb-3">
+    <div class="col-md-8">
+        <h2><i class="bi bi-file-earmark"></i> {{ document.original_filename }}</h2>
+    </div>
+    <div class="col-md-4 text-end">
+        <a href="{{ url_for('dashboard') }}" class="btn btn-secondary">
+            <i class="bi bi-arrow-left"></i> Back to Dashboard
+        </a>
+    </div>
+</div>
+
+<div class="row">
+    <div class="col-md-8">
+        <div class="card mb-4">
+            <div class="card-header bg-primary text-white">
+                <h5 class="mb-0"><i class="bi bi-eye"></i> Document Viewer</h5>
+            </div>
+            <div class="card-body">
+                <div class="document-viewer">
+                    {% if document.file_type == 'pdf' %}
+                    <div class="ratio ratio-16x9">
+                        <iframe src="{{ url_for('serve_document_file', document_id=document.id) }}" allowfullscreen></iframe>
+                    </div>
+                    {% elif document.file_type == 'image' %}
+                    <img src="{{ url_for('download_document', document_id=document.id) }}" class="img-fluid" alt="{{ document.original_filename }}">
+                    {% elif document.file_type == 'video' %}
+                    <div class="ratio ratio-16x9">
+                        <video controls>
+                            <source src="{{ url_for('download_document', document_id=document.id) }}" type="video/mp4">
+                            Your browser does not support the video tag.
+                        </video>
+                    </div>
+                    {% else %}
+                    <div class="alert alert-info">
+                        <i class="bi bi-info-circle"></i> Preview not available for this file type. Please download the file to view its contents.
+                    </div>
+                    {% endif %}
+                </div>
+                
+                <div class="mt-3">
+                    <a href="{{ url_for('download_document', document_id=document.id) }}" class="btn btn-primary">
+                        <i class="bi bi-download"></i> Download
+                    </a>
+                    <a href="{{ url_for('share_document', document_id=document.id) }}" class="btn btn-info">
+                        <i class="bi bi-share"></i> Share
+                    </a>
+                    {% if document.user_id == session.user_id or session.role == 'admin' %}
+                    <a href="{{ url_for('delete_document', document_id=document.id) }}" class="btn btn-danger"
+                       onclick="return confirm('Are you sure you want to delete this document?')">
+                        <i class="bi bi-trash"></i> Delete
+                    </a>
+                    {% endif %}
+                </div>
+            </div>
+        </div>
+        
+        <div class="card mb-4">
+            <div class="card-header bg-info text-white">
+                <h5 class="mb-0"><i class="bi bi-clock-history"></i> Version History</h5>
+            </div>
+            <div class="card-body">
+                <div class="table-responsive">
+                    <table class="table table-striped">
+                        <thead>
+                            <tr>
+                                <th>Version</th>
+                                <th>Date</th>
+                                <th>Actions</th>
+                            </tr>
+                        </thead>
+                        <tbody>
+                            {% for version in versions %}
+                            <tr>
+                                <td>v{{ version.version_number }}</td>
+                                <td>{{ version.created_at }}</td>
+                                <td>
+                                    <a href="#" class="btn btn-sm btn-primary">
+                                        <i class="bi bi-download"></i> Download
+                                    </a>
+                                </td>
+                            </tr>
+                            {% endfor %}
+                        </tbody>
+                    </table>
+                </div>
+            </div>
+        </div>
+    </div>
+    
+    <div class="col-md-4">
+        <div class="card mb-4">
+            <div class="card-header bg-secondary text-white">
+                <h5 class="mb-0"><i class="bi bi-info-circle"></i> Document Information</h5>
+            </div>
+            <div class="card-body">
+                <ul class="list-group list-group-flush">
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        File Type
+                        <span class="badge bg-primary rounded-pill">{{ document.file_type }}</span>
+                    </li>
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Size
+                        <span class="badge bg-secondary rounded-pill">{{ (document.file_size / 1024)|round(1) }} KB</span>
+                    </li>
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Uploaded
+                        <span class="badge bg-info rounded-pill">{{ document.created_at.split(' ')[0] }}</span>
+                    </li>
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Visibility
+                        <span class="badge bg-{{ 'success' if document.visibility == 'public' else 'warning' }} rounded-pill">
+                            {{ document.visibility }}
+                        </span>
+                    </li>
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        Versions
+                        <span class="badge bg-dark rounded-pill">{{ versions|length }}</span>
+                    </li>
+                </ul>
+            </div>
+        </div>
+        
+        <div class="card">
+            <div class="card-header bg-success text-white">
+                <h5 class="mb-0"><i class="bi bi-share"></i> Sharing Information</h5>
+            </div>
+            <div class="card-body">
+                {% if shares %}
+                <h6>Shared With</h6>
+                <ul class="list-group list-group-flush mb-3">
+                    {% for share in shares %}
+                    <li class="list-group-item d-flex justify-content-between align-items-center">
+                        {% if share.shared_with %}
+                        <span><i class="bi bi-person"></i> {{ share.username }}</span>
+                        {% elif share.share_link %}
+                        <span><i class="bi bi-link"></i> Via Link</span>
+                        <small class="text-muted">
+                            {% if share.expires_at %}
+                            Expires: {{ share.expires_at.split(' ')[0] }}
+                            {% endif %}
+                        </small>
+                        {% endif %}
+                    </li>
+                    {% endfor %}
+                </ul>
+                {% else %}
+                <p>This document hasn't been shared yet.</p>
+                {% endif %}
+                
+                <a href="{{ url_for('share_document', document_id=document.id) }}" class="btn btn-success w-100">
+                    <i class="bi bi-share"></i> Manage Sharing
+                </a>
+            </div>
+        </div>
+    </div>
+</div>
+{% endblock %}

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