# ==============================================
# Breakpilot Drive - Game Database
# ==============================================
# Async PostgreSQL database access for game sessions
# and student learning state.
#
# Barrel re-export: all public symbols are importable from here.

import logging
from typing import Optional

from .database_models import (
    GAME_DB_URL,
    LearningLevel,
    StudentLearningState,
    GameSessionRecord,
    GameQuizAnswer,
    Achievement,
    ACHIEVEMENTS,
)
from .database_learning import LearningStateMixin
from .database_sessions import SessionsMixin
from .database_extras import ExtrasMixin

logger = logging.getLogger(__name__)


class GameDatabase(LearningStateMixin, SessionsMixin, ExtrasMixin):
    """
    Async database access for Breakpilot Drive game data.

    Uses asyncpg for PostgreSQL access with connection pooling.
    """

    def __init__(self, database_url: Optional[str] = None):
        self.database_url = database_url or GAME_DB_URL
        self._pool = None
        self._connected = False

    async def connect(self):
        """Initialize connection pool."""
        if self._connected:
            return

        try:
            import asyncpg
            self._pool = await asyncpg.create_pool(
                self.database_url,
                min_size=2,
                max_size=10,
            )
            self._connected = True
            logger.info("Game database connected")
        except ImportError:
            logger.warning("asyncpg not installed, database features disabled")
        except Exception as e:
            logger.error(f"Game database connection failed: {e}")

    async def close(self):
        """Close connection pool."""
        if self._pool:
            await self._pool.close()
            self._connected = False

    async def _ensure_connected(self):
        """Ensure database is connected."""
        if not self._connected:
            await self.connect()


# Global database instance
_game_db: Optional[GameDatabase] = None


async def get_game_db() -> GameDatabase:
    """Get or create the global game database instance."""
    global _game_db

    if _game_db is None:
        _game_db = GameDatabase()
        await _game_db.connect()

    return _game_db