import os
from typing import Optional

from pydantic_settings import BaseSettings, SettingsConfigDict


class DatabaseSettings(BaseSettings):
    database_url: str = "postgresql+psycopg://postgres:postgres@postgres:5432/xiaoxia_saas"
    pool_size: int = 20
    max_overflow: int = 40
    pool_timeout: int = 30
    pool_recycle: int = 3600

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


_settings: Optional[DatabaseSettings] = None


def get_database_settings() -> DatabaseSettings:
    global _settings
    if _settings is None:
        env = os.getenv("APP_ENV", "development")
        env_file = f".env.{env}" if env != "development" else ".env"
        if os.path.exists(env_file):
            _settings = DatabaseSettings(_env_file=env_file)
        else:
            _settings = DatabaseSettings()
    return _settings