import asyncio
from datetime import datetime
import logging
from typing import Dict, List
import json

logger = logging.getLogger(__name__)

class EventMonitor:
    def __init__(self, bot):
        self.bot = bot
        self.monitoring_tasks: Dict[int, asyncio.Task] = {}  # user_id -> task
        self.user_filters: Dict[int, dict] = {}  # user_id -> filters
        self.last_events: Dict[int, List[str]] = {}  # user_id -> list of event IDs

    async def start_monitoring(self, user_id: int, filters: dict):
        """Start monitoring events for a user with given filters"""
        if user_id in self.monitoring_tasks:
            # Stop existing task if any
            self.monitoring_tasks[user_id].cancel()
        
        # Store user filters
        self.user_filters[user_id] = filters
        self.last_events[user_id] = []
        
        # Create and start new monitoring task
        task = asyncio.create_task(self._monitor_loop(user_id))
        self.monitoring_tasks[user_id] = task
        
        return True

    async def stop_monitoring(self, user_id: int):
        """Stop monitoring events for a user"""
        if user_id in self.monitoring_tasks:
            self.monitoring_tasks[user_id].cancel()
            del self.monitoring_tasks[user_id]
            del self.user_filters[user_id]
            del self.last_events[user_id]
            return True
        return False

    async def _monitor_loop(self, user_id: int):
        """Main monitoring loop"""
        while True:
            try:
                filters = self.user_filters[user_id]
                # Get current events using existing payload method
                payload = self.bot._get_events_payload(**filters)
                response = await self.bot._make_request(payload)
                events = response["data"]["eventCollection"]["items"]
                
                # Check for new events
                current_event_ids = [event['id'] for event in events]
                new_events = [event for event in events 
                            if event['id'] not in self.last_events[user_id]]
                
                if new_events:
                    # Send notification for each new event
                    for event in new_events:
                        message = self._format_event_message(event)
                        await self.bot.send_message(user_id, message)
                
                # Update last events list
                self.last_events[user_id] = current_event_ids
                
                # Wait for 1 minute before next check
                await asyncio.sleep(60)
                
            except asyncio.CancelledError:
                break
            except Exception as e:
                logger.error(f"Error in monitor loop for user {user_id}: {e}")
                await asyncio.sleep(60)  # Wait before retrying

    def _format_event_message(self, event: dict) -> str:
        """Format event details into a message"""
        message_parts = [
            "🎉 *New Event Alert!* 🎉",
            f"🏆 *{event.get('title', 'N/A')}*",
        ]
        
        if event.get('subtitle'):
            message_parts.append(f"_{event.get('subtitle')}_")
            
        location = event.get('location', {}).get('title', 'N/A')
        message_parts.append(f"📍 Location: {location}")
        
        price = event.get('startingPrice', 'N/A')
        currency = event.get('currencyCode', 'N/A')
        message_parts.append(f"💰 Starting Price: {price} {currency}")
        
        schedule = event.get('schedule', {})
        if schedule.get('openDateTime'):
            message_parts.append(f"🕒 Starts: {schedule['openDateTime']}")
            
        if event.get('ticketingUrlSlug'):
            message_parts.append(
                f"[More Info/Tickets](https://webook.com/ar/events/{event['ticketingUrlSlug']})"
            )
            
        return "\n".join(message_parts)