Fix channel management: add delete, edit, and content management functionality with proper navigation

server.py

@@ -260,14 +260,14 @@ def upload_file():
                 
                 if channel and channel.is_active:
                     # Get next order number for this channel
-                    max_order = db.session.query(db.func.max(ChannelContent.order)).filter_by(channel_id=channel_id).scalar() or 0
+                    max_order = db.session.query(db.func.max(ChannelContent.order_index)).filter_by(channel_id=channel_id).scalar() or 0
                     
                     # Add to channel
                     channel_content = ChannelContent(
                         channel_id=channel_id,
                         media_file_id=media_file.id,
-                        duration=int(display_duration),
-                        order=max_order + 1
+                        display_duration=int(display_duration),
+                        order_index=max_order + 1
                     )
                     db.session.add(channel_content)
                     db.session.commit()
@@ -353,6 +353,139 @@ def add_channel():
     
     return redirect(url_for('view_channels'))
 
+@app.route('/delete_channel/<int:channel_id>')
+@login_required
+def delete_channel(channel_id):
+    channel = StreamingChannel.query.get_or_404(channel_id)
+    
+    # Check permissions
+    if current_user.role != 'admin' and channel.created_by != current_user.id:
+        flash('Access denied. You can only delete your own channels.', 'error')
+        return redirect(url_for('view_channels'))
+    
+    # Prevent deleting default channel
+    if channel.is_default:
+        flash('Cannot delete the default channel.', 'error')
+        return redirect(url_for('view_channels'))
+    
+    # Check if any players are assigned to this channel
+    assigned_players = Player.query.filter_by(channel_id=channel_id).count()
+    if assigned_players > 0:
+        flash(f'Cannot delete channel. {assigned_players} player(s) are assigned to this channel.', 'error')
+        return redirect(url_for('view_channels'))
+    
+    channel_name = channel.name
+    db.session.delete(channel)
+    db.session.commit()
+    
+    log_activity('Channel deleted', f'Deleted channel: {channel_name}')
+    flash(f'Channel "{channel_name}" deleted successfully!', 'success')
+    return redirect(url_for('view_channels'))
+
+@app.route('/edit_channel/<int:channel_id>', methods=['GET', 'POST'])
+@login_required
+def edit_channel(channel_id):
+    channel = StreamingChannel.query.get_or_404(channel_id)
+    
+    # Check permissions
+    if current_user.role != 'admin' and channel.created_by != current_user.id:
+        flash('Access denied. You can only edit your own channels.', 'error')
+        return redirect(url_for('view_channels'))
+    
+    if request.method == 'POST':
+        try:
+            # If setting as default, unset other defaults
+            is_default = 'is_default' in request.form
+            if is_default and not channel.is_default:
+                StreamingChannel.query.filter_by(is_default=True).update({'is_default': False})
+            
+            channel.name = request.form['name']
+            channel.description = request.form.get('description', '')
+            channel.is_default = is_default
+            channel.is_active = 'is_active' in request.form
+            
+            db.session.commit()
+            
+            log_activity('Channel updated', f'Updated channel: {channel.name}')
+            flash(f'Channel "{channel.name}" updated successfully!', 'success')
+        except Exception as e:
+            flash(f'Error updating channel: {str(e)}', 'error')
+        
+        return redirect(url_for('view_channels'))
+    
+    return render_template('edit_channel.html', channel=channel)
+
+@app.route('/manage_content/<int:channel_id>')
+@login_required
+def manage_content(channel_id):
+    channel = StreamingChannel.query.get_or_404(channel_id)
+    
+    # Check permissions
+    if current_user.role != 'admin' and channel.created_by != current_user.id:
+        flash('Access denied. You can only manage content of your own channels.', 'error')
+        return redirect(url_for('view_channels'))
+    
+    # Get all available media files
+    available_media = MediaFile.query.filter_by(is_active=True).order_by(MediaFile.upload_date.desc()).all()
+    
+    # Get current channel content with media file details
+    channel_content = ChannelContent.query.filter_by(channel_id=channel_id).order_by(ChannelContent.order_index).all()
+    
+    return render_template('manage_content.html', channel=channel, available_media=available_media, channel_content=channel_content)
+
+@app.route('/add_content_to_channel', methods=['POST'])
+@login_required
+def add_content_to_channel():
+    channel_id = request.form['channel_id']
+    media_file_id = request.form['media_file_id']
+    duration = request.form.get('duration', 10)
+    
+    channel = StreamingChannel.query.get_or_404(channel_id)
+    
+    # Check permissions
+    if current_user.role != 'admin' and channel.created_by != current_user.id:
+        flash('Access denied.', 'error')
+        return redirect(url_for('view_channels'))
+    
+    # Get next order number
+    max_order = db.session.query(db.func.max(ChannelContent.order_index)).filter_by(channel_id=channel_id).scalar() or 0
+    
+    # Add content
+    content = ChannelContent(
+        channel_id=channel_id,
+        media_file_id=media_file_id,
+        display_duration=int(duration),
+        order_index=max_order + 1
+    )
+    
+    db.session.add(content)
+    db.session.commit()
+    
+    media_file = MediaFile.query.get(media_file_id)
+    log_activity('Content added to channel', f'Added {media_file.original_name} to {channel.name}')
+    flash('Content added to channel successfully!', 'success')
+    
+    return redirect(url_for('manage_content', channel_id=channel_id))
+
+@app.route('/remove_content_from_channel/<int:content_id>')
+@login_required
+def remove_content_from_channel(content_id):
+    content = ChannelContent.query.get_or_404(content_id)
+    channel = content.channel
+    
+    # Check permissions
+    if current_user.role != 'admin' and channel.created_by != current_user.id:
+        flash('Access denied.', 'error')
+        return redirect(url_for('view_channels'))
+    
+    db.session.delete(content)
+    db.session.commit()
+    
+    log_activity('Content removed from channel', f'Removed content from {channel.name}')
+    flash('Content removed from channel successfully!', 'success')
+    
+    return redirect(url_for('manage_content', channel_id=channel.id))
+
 # User Management Routes
 @app.route('/add_user', methods=['POST'])
 @login_required