"""Application configuration using Pydantic Settings."""

import secrets
from functools import lru_cache

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Application settings loaded from environment variables."""

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        case_sensitive=False,
    )

    # Database (port 5433 to avoid conflict with existing Postgres)
    DATABASE_URL: str = "postgresql+asyncpg://orchestrator:orchestrator@localhost:5433/orchestrator"

    # Application
    DEBUG: bool = False
    APP_NAME: str = "LetsBe Orchestrator"
    APP_VERSION: str = "0.1.0"

    # Connection pool settings
    DB_POOL_SIZE: int = 5
    DB_MAX_OVERFLOW: int = 10
    DB_POOL_TIMEOUT: int = 30
    DB_POOL_RECYCLE: int = 1800

    # Authentication
    # Admin API key for protected endpoints (registration token management)
    # In production, this MUST be set via ADMIN_API_KEY environment variable
    ADMIN_API_KEY: str = Field(
        default_factory=lambda: secrets.token_hex(32),
        description="API key for admin endpoints. Set via ADMIN_API_KEY env var in production.",
    )


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


# For backward compatibility
settings = get_settings()