import json
import random
import string
from typing import Optional
import redis.asyncio as redis
from app.config import get_settings

settings = get_settings()


class RoomManager:
    def __init__(self):
        self.redis: Optional[redis.Redis] = None

    async def connect(self):
        if not self.redis:
            self.redis = await redis.from_url(settings.redis_url)

    async def disconnect(self):
        if self.redis:
            await self.redis.close()

    def _generate_room_code(self) -> str:
        """Generate a 6-character room code."""
        return ''.join(random.choices(string.ascii_uppercase + string.digits, k=6))

    async def create_room(self, player_name: str, socket_id: str) -> dict:
        """Create a new game room."""
        await self.connect()

        # Generate unique room code
        room_code = self._generate_room_code()
        while await self.redis.exists(f"room:{room_code}"):
            room_code = self._generate_room_code()

        # Create room state
        room_state = {
            "code": room_code,
            "status": "waiting",
            "host": player_name,
            "teams": {
                "A": [],
                "B": []
            },
            "current_team": None,
            "current_player_index": {"A": 0, "B": 0},
            "current_question": None,
            "can_steal": False,
            "scores": {"A": 0, "B": 0},
            "questions_used": [],
            "board": {}
        }

        # Save room state
        await self.redis.setex(
            f"room:{room_code}",
            3600 * 3,  # 3 hours TTL
            json.dumps(room_state)
        )

        # Add player to room
        room = await self.add_player(room_code, player_name, "A", socket_id)

        return room

    async def get_room(self, room_code: str) -> Optional[dict]:
        """Get room state by code."""
        await self.connect()
        data = await self.redis.get(f"room:{room_code}")
        if data:
            return json.loads(data)
        return None

    async def update_room(self, room_code: str, room_state: dict) -> bool:
        """Update room state."""
        await self.connect()
        await self.redis.setex(
            f"room:{room_code}",
            3600 * 3,
            json.dumps(room_state)
        )
        return True

    async def add_player(
        self,
        room_code: str,
        player_name: str,
        team: str,
        socket_id: str
    ) -> Optional[dict]:
        """Add a player to a room."""
        room = await self.get_room(room_code)
        if not room:
            return None

        # Check if team is full
        if len(room["teams"][team]) >= 4:
            return None

        # Check if name is taken
        for t in ["A", "B"]:
            for p in room["teams"][t]:
                if p["name"].lower() == player_name.lower():
                    return None

        # Add player
        player = {
            "name": player_name,
            "team": team,
            "position": len(room["teams"][team]),
            "socket_id": socket_id
        }
        room["teams"][team].append(player)

        # Save player mapping
        await self.redis.setex(
            f"player:{socket_id}",
            3600 * 3,
            json.dumps({"name": player_name, "room": room_code, "team": team})
        )

        await self.update_room(room_code, room)
        return room

    async def remove_player(self, socket_id: str) -> Optional[dict]:
        """Remove a player from their room."""
        await self.connect()

        # Get player info
        player_data = await self.redis.get(f"player:{socket_id}")
        if not player_data:
            return None

        player_info = json.loads(player_data)
        room_code = player_info["room"]
        team = player_info["team"]

        # Get room
        room = await self.get_room(room_code)
        if not room:
            return None

        # Remove player from team
        room["teams"][team] = [
            p for p in room["teams"][team] if p["socket_id"] != socket_id
        ]

        # Update positions
        for i, p in enumerate(room["teams"][team]):
            p["position"] = i

        # Delete player mapping
        await self.redis.delete(f"player:{socket_id}")

        # If room is empty, delete it
        if not room["teams"]["A"] and not room["teams"]["B"]:
            await self.redis.delete(f"room:{room_code}")
            return None

        await self.update_room(room_code, room)
        return room

    async def get_player(self, socket_id: str) -> Optional[dict]:
        """Get player info by socket ID."""
        await self.connect()
        data = await self.redis.get(f"player:{socket_id}")
        if data:
            return json.loads(data)
        return None

    async def update_player(self, socket_id: str, updates: dict) -> Optional[dict]:
        """Update player info."""
        await self.connect()
        data = await self.redis.get(f"player:{socket_id}")
        if not data:
            return None

        player = json.loads(data)
        player.update(updates)

        await self.redis.setex(
            f"player:{socket_id}",
            3600 * 3,
            json.dumps(player)
        )
        return player

    async def get_player_stats(self, room_code: str, player_name: str) -> Optional[dict]:
        """Obtiene stats de un jugador."""
        await self.connect()
        data = await self.redis.get(f"stats:{room_code}:{player_name}")
        if data:
            return json.loads(data)
        return None

    async def set_player_stats(self, room_code: str, player_name: str, stats: dict) -> None:
        """Guarda stats de un jugador."""
        await self.connect()
        await self.redis.setex(
            f"stats:{room_code}:{player_name}",
            3600 * 3,
            json.dumps(stats)
        )

    async def init_player_stats(self, room_code: str, player_name: str) -> dict:
        """Inicializa stats para un nuevo jugador."""
        stats = {
            "player_name": player_name,
            "current_streak": 0,
            "total_correct": 0,
            "total_steals": 0,
            "successful_steals": 0,
            "category_correct": {},
            "fastest_answer_seconds": None,
            "questions_500_correct": 0
        }
        await self.set_player_stats(room_code, player_name, stats)
        return stats


# Singleton instance
room_manager = RoomManager()