import os
from typing import Optional

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    APP_NAME: str = "xiaoxia-saas"
    APP_VERSION: str = "0.1.0"
    ENVIRONMENT: str = "development"
    DEBUG: bool = True

    API_HOST: str = "0.0.0.0"
    API_PORT: int = 8000
    API_PREFIX: str = "/api/v1"

    DATABASE_URL: str = "postgresql+psycopg://postgres:postgres@localhost:5432/xiaoxia_saas"
    DATABASE_POOL_SIZE: int = 20
    DATABASE_MAX_OVERFLOW: int = 40
    DATABASE_POOL_TIMEOUT: int = 30
    DATABASE_POOL_RECYCLE: int = 3600
    USE_IN_MEMORY_DB: bool = False
    AUTO_CREATE_SCHEMA: bool = False

    REDIS_URL: str = "redis://localhost:6379/0"
    REDIS_MAX_CONNECTIONS: int = 50

    JWT_SECRET_KEY: str = "your-secret-key-change-in-production"

    CELERY_BROKER_URL: str = "redis://localhost:6379/0"
    CELERY_RESULT_BACKEND: str = "redis://localhost:6379/1"

    # 阿里云 OSS 配置
    OSS_ENDPOINT: str = "oss-cn-hangzhou.aliyuncs.com"
    OSS_ACCESS_KEY_ID: str = ""
    OSS_ACCESS_KEY_SECRET: str = ""
    OSS_BUCKET_NAME: str = "xiaoxia-autocut"

    LOG_LEVEL: str = "INFO"
    CORS_ORIGINS_RAW: str = "http://localhost:3000,http://localhost:5173,http://localhost:8000"

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

    @property
    def CORS_ORIGINS(self) -> list[str]:
        return [origin.strip() for origin in self.CORS_ORIGINS_RAW.split(",") if origin.strip()]

    @property
    def database_url(self) -> str:
        return self.DATABASE_URL

    @property
    def redis_url(self) -> str:
        return self.REDIS_URL

    @property
    def celery_broker_url(self) -> str:
        return self.CELERY_BROKER_URL

    @property
    def celery_result_backend(self) -> str:
        return self.CELERY_RESULT_BACKEND

    @property
    def oss_endpoint(self) -> str:
        return self.OSS_ENDPOINT

    @property
    def oss_access_key_id(self) -> str:
        return self.OSS_ACCESS_KEY_ID

    @property
    def oss_access_key_secret(self) -> str:
        return self.OSS_ACCESS_KEY_SECRET

    @property
    def oss_bucket_name(self) -> str:
        return self.OSS_BUCKET_NAME


_settings: Optional[Settings] = None


def get_settings() -> Settings:
    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 = Settings(_env_file=env_file)
        else:
            _settings = Settings()
    return _settings


settings = get_settings()