from flask import Blueprint, request, jsonify, current_app
from flask_jwt_extended import jwt_required, get_jwt_identity
from backend.services.schedule_service import ScheduleService
from backend.celery_tasks.schedule_loader import load_schedules_task

schedules_bp = Blueprint('schedules', __name__)

@schedules_bp.route('/', methods=['OPTIONS'])
@schedules_bp.route('', methods=['OPTIONS'])
def handle_options():
    """Handle OPTIONS requests for preflight CORS checks."""
    return '', 200

@schedules_bp.route('/', methods=['GET'])
@schedules_bp.route('', methods=['GET'])
@jwt_required()
def get_schedules():
    """
    Get all schedules for the current user.
    
    Returns:
        JSON: List of schedules
    """
    try:
        user_id = get_jwt_identity()
        print(f"[DEBUG] get_schedules called for user_id: {user_id}")
        
        # Check if Supabase client is initialized
        if not hasattr(current_app, 'supabase') or current_app.supabase is None:
            print("[ERROR] Supabase client not initialized")
            # Add CORS headers to error response
            response_data = jsonify({
                'success': False,
                'message': 'Database connection not initialized'
            })
            response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
            response_data.headers.add('Access-Control-Allow-Credentials', 'true')
            return response_data, 500
        
        schedule_service = ScheduleService()
        schedules = schedule_service.get_user_schedules(user_id)
        print(f"[DEBUG] Found {len(schedules)} schedules for user {user_id}")
        
        # Add CORS headers explicitly
        response_data = jsonify({
            'success': True,
            'schedules': schedules
        })
        response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
        response_data.headers.add('Access-Control-Allow-Credentials', 'true')
        return response_data, 200
        
    except Exception as e:
        print(f"[ERROR] Get schedules error: {str(e)}")
        import traceback
        print(f"[ERROR] Full traceback: {traceback.format_exc()}")
        current_app.logger.error(f"Get schedules error: {str(e)}")
        # Add CORS headers to error response
        response_data = jsonify({
            'success': False,
            'message': f'An error occurred while fetching schedules: {str(e)}',
            'schedules': []  # Return empty array on error
        })
        response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
        response_data.headers.add('Access-Control-Allow-Credentials', 'true')
        return response_data, 500

@schedules_bp.route('/', methods=['POST'])
@schedules_bp.route('', methods=['POST'])
@jwt_required()
def create_schedule():
    """
    Create a new schedule for the current user.
    
    Request Body:
        social_network (str): Social account ID
        schedule_time (str): Schedule time in format "HH:MM"
        days (List[str]): List of days to schedule
        
    Returns:
        JSON: Create schedule result
    """
    try:
        user_id = get_jwt_identity()
        data = request.get_json()
        
        # Validate required fields
        required_fields = ['social_network', 'schedule_time', 'days']
        if not data or not all(k in data for k in required_fields):
            # Add CORS headers to error response
            response_data = jsonify({
                'success': False,
                'message': 'Social network, schedule time, and days are required'
            })
            response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
            response_data.headers.add('Access-Control-Allow-Credentials', 'true')
            return response_data, 400
        
        social_network = data['social_network']
        schedule_time = data['schedule_time']
        days = data['days']
        
        # Validate days format
        valid_days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
        if not isinstance(days, list) or not all(day in valid_days for day in days):
            # Add CORS headers to error response
            response_data = jsonify({
                'success': False,
                'message': 'Days must be a list of valid day names'
            })
            response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
            response_data.headers.add('Access-Control-Allow-Credentials', 'true')
            return response_data, 400
        
        # Validate time format
        try:
            hour, minute = map(int, schedule_time.split(':'))
            if hour < 0 or hour > 23 or minute < 0 or minute > 59:
                raise ValueError
        except ValueError:
            # Add CORS headers to error response
            response_data = jsonify({
                'success': False,
                'message': 'Schedule time must be in format HH:MM (24-hour format)'
            })
            response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
            response_data.headers.add('Access-Control-Allow-Credentials', 'true')
            return response_data, 400
        
        # Create schedule using schedule service
        schedule_service = ScheduleService()
        result = schedule_service.create_schedule(user_id, social_network, schedule_time, days)
        
        if result['success']:
            # Trigger immediate Celery Beat schedule update
            try:
                print("[INFO] Triggering immediate Celery Beat schedule update...")
                # Execute the schedule loader task immediately to update Celery Beat
                celery_result = load_schedules_task.delay()
                print(f"[INFO] Celery Beat update task queued: {celery_result.id}")
                
                # Add the task ID to the response for tracking
                result['celery_update_task_id'] = celery_result.id
                result['message'] += ' (Scheduler updated immediately)'
            except Exception as e:
                print(f"[WARNING] Failed to trigger immediate Celery update: {str(e)}")
                # Don't fail the schedule creation if Celery update fails
                result['message'] += ' (Note: Scheduler update will occur in 5 minutes)'
            
            # Add CORS headers to success response
            response_data = jsonify(result)
            response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
            response_data.headers.add('Access-Control-Allow-Credentials', 'true')
            return response_data, 201
        else:
            # Add CORS headers to error response
            response_data = jsonify(result)
            response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
            response_data.headers.add('Access-Control-Allow-Credentials', 'true')
            return response_data, 400
        
    except Exception as e:
        current_app.logger.error(f"Create schedule error: {str(e)}")
        # Add CORS headers to error response
        response_data = jsonify({
            'success': False,
            'message': f'An error occurred while creating schedule: {str(e)}'
        })
        response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
        response_data.headers.add('Access-Control-Allow-Credentials', 'true')
        return response_data, 500

@schedules_bp.route('/<schedule_id>', methods=['OPTIONS'])
def handle_schedule_options(schedule_id):
    """Handle OPTIONS requests for preflight CORS checks for specific schedule."""
    return '', 200

@schedules_bp.route('/<schedule_id>', methods=['DELETE'])
@jwt_required()
def delete_schedule(schedule_id):
    """
    Delete a schedule.
    
    Path Parameters:
        schedule_id (str): Schedule ID
        
    Returns:
        JSON: Delete schedule result
    """
    try:
        user_id = get_jwt_identity()
        
        # Verify the schedule belongs to the user
        response = (
            current_app.supabase
            .table("Scheduling")
            .select("Social_network(id_utilisateur)")
            .eq("id", schedule_id)
            .execute()
        )
        
        if not response.data:
            # Add CORS headers to error response
            response_data = jsonify({
                'success': False,
                'message': 'Schedule not found'
            })
            response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
            response_data.headers.add('Access-Control-Allow-Credentials', 'true')
            return response_data, 404
        
        schedule = response.data[0]
        if schedule.get('Social_network', {}).get('id_utilisateur') != user_id:
            # Add CORS headers to error response
            response_data = jsonify({
                'success': False,
                'message': 'Unauthorized to delete this schedule'
            })
            response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
            response_data.headers.add('Access-Control-Allow-Credentials', 'true')
            return response_data, 403
        
        # Delete schedule using schedule service
        schedule_service = ScheduleService()
        result = schedule_service.delete_schedule(schedule_id)
        
        if result['success']:
            # Trigger immediate Celery Beat schedule update
            try:
                print("[INFO] Triggering immediate Celery Beat schedule update after deletion...")
                # Execute the schedule loader task immediately to update Celery Beat
                celery_result = load_schedules_task.delay()
                print(f"[INFO] Celery Beat update task queued: {celery_result.id}")
                
                # Add the task ID to the response for tracking
                result['celery_update_task_id'] = celery_result.id
                result['message'] += ' (Scheduler updated immediately)'
            except Exception as e:
                print(f"[WARNING] Failed to trigger immediate Celery update: {str(e)}")
                # Don't fail the schedule deletion if Celery update fails
                result['message'] += ' (Note: Scheduler update will occur in 5 minutes)'
            
            # Add CORS headers to success response
            response_data = jsonify(result)
            response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
            response_data.headers.add('Access-Control-Allow-Credentials', 'true')
            return response_data, 200
        else:
            # Add CORS headers to error response
            response_data = jsonify(result)
            response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
            response_data.headers.add('Access-Control-Allow-Credentials', 'true')
            return response_data, 404
        
    except Exception as e:
        current_app.logger.error(f"Delete schedule error: {str(e)}")
        # Add CORS headers to error response
        response_data = jsonify({
            'success': False,
            'message': f'An error occurred while deleting schedule: {str(e)}'
        })
        response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
        response_data.headers.add('Access-Control-Allow-Credentials', 'true')
        return response_data, 500