from functools import lru_cache

from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    """Application settings"""

    # Application
    app_env: str = "development"
    debug: bool = True
    secret_key: str

    # Database
    database_url: str
    db_pool_size: int = 20
    db_max_overflow: int = 10

    # Redis
    redis_url: str = "redis://localhost:6379/0"

    # Discord OAuth
    discord_client_id: str
    discord_client_secret: str
    discord_redirect_uri: str  # Legacy frontend callback
    discord_server_redirect_uri: str = ""  # Server-side callback URL
    frontend_url: str = "http://localhost:3000"  # Frontend base URL for redirects

    # Access Control - Comma-separated list of allowed Discord user IDs
    # Leave empty or set to "*" to allow all users (NOT recommended for production)
    allowed_discord_ids: str = ""

    # League APIs
    sba_api_url: str
    sba_api_key: str
    pd_api_url: str
    pd_api_key: str

    # WebSocket
    ws_heartbeat_interval: int = 30
    ws_connection_timeout: int = 60

    # CORS
    cors_origins: list[str] = ["http://localhost:3000", "http://localhost:3001"]

    # Game settings
    max_concurrent_games: int = 20
    game_idle_timeout: int = 86400  # 24 hours

    # Game eviction settings (memory management)
    game_idle_timeout_hours: int = 24  # Evict games idle > 24 hours
    game_eviction_interval_minutes: int = 60  # Check every hour
    game_max_in_memory: int = 500  # Hard limit on in-memory games

    # Rate limiting settings
    rate_limit_websocket_per_minute: int = 120  # Events per minute per connection
    rate_limit_api_per_minute: int = 100  # API calls per minute per user
    rate_limit_decision_per_game: int = 20  # Decisions per minute per game
    rate_limit_roll_per_game: int = 30  # Rolls per minute per game
    rate_limit_substitution_per_game: int = 15  # Substitutions per minute per game
    rate_limit_cleanup_interval: int = 300  # Cleanup stale buckets every 5 min

    class Config:
        env_file = ".env"
        case_sensitive = False


@lru_cache
def get_settings() -> Settings:
    """Get cached settings instance"""
    return Settings()