import uuid
import json
from app.core.cache import redis_client

class TicketService:
    EXPIRE_SECONDS = 60 # Tickets are short lived

    @staticmethod
    def generate_ticket(user_id: int, target_app_id: str) -> str:
        ticket = str(uuid.uuid4())
        key = f"TICKET:{ticket}"
        data = {
            "user_id": user_id,
            "target_app_id": target_app_id
        }
        redis_client.setex(key, TicketService.EXPIRE_SECONDS, json.dumps(data))
        return ticket

    @staticmethod
    def consume_ticket(ticket: str, app_id: str) -> dict:
        """
        Validates and consumes (deletes) the ticket.
        Returns ticket data if valid and matches app_id.
        """
        key = f"TICKET:{ticket}"
        data_str = redis_client.get(key)
        
        if not data_str:
            return None
            
        data = json.loads(data_str)
        
        # Verify it was meant for this app
        if data.get("target_app_id") != app_id:
            return None
            
        # Delete (One-time use)
        redis_client.delete(key)
        
        return data