from pydantic import Field, model_validator
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """应用全局配置"""

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

    # 应用基础配置
    app_name: str = "DreamWeaver"
    debug: bool = False
    secret_key: str = Field(..., description="JWT 签名密钥")
    base_url: str = Field("http://localhost:8000", description="后端对外回调地址")

    # 数据库
    database_url: str = Field(..., description="SQLAlchemy async URL")

    # OAuth - GitHub
    github_client_id: str = ""
    github_client_secret: str = ""

    # OAuth - Google
    google_client_id: str = ""
    google_client_secret: str = ""

    # AI Capability Keys
    text_api_key: str = ""
    tts_api_base: str = ""
    tts_api_key: str = ""
    image_api_key: str = ""

    # Additional Provider API Keys
    openai_api_key: str = ""
    elevenlabs_api_key: str = ""
    cqtai_api_key: str = ""
    minimax_api_key: str = ""
    minimax_group_id: str = ""
    antigravity_api_key: str = ""
    antigravity_api_base: str = ""

    # AI Model Configuration
    text_model: str = "gemini-2.0-flash"
    tts_model: str = ""
    image_model: str = ""

    # Provider routing (ordered lists)
    text_providers: list[str] = Field(default_factory=lambda: ["gemini"])
    image_providers: list[str] = Field(default_factory=lambda: ["cqtai"])
    tts_providers: list[str] = Field(default_factory=lambda: ["minimax", "elevenlabs", "edge_tts"])

    # Celery (Redis)
    celery_broker_url: str = Field("redis://localhost:6379/0")
    celery_result_backend: str = Field("redis://localhost:6379/0")
    
    # Generic Redis
    redis_url: str = Field("redis://localhost:6379/0", description="Redis connection URL")

    # Admin console
    enable_admin_console: bool = False
    admin_username: str = "admin"
    admin_password: str = "admin123"  # 建议通过环境变量覆盖

    # CORS
    cors_origins: list[str] = Field(default_factory=lambda: ["http://localhost:5173"])

    @model_validator(mode="after")
    def _require_core_settings(self) -> "Settings":  # type: ignore[override]
        missing = []
        if not self.secret_key or self.secret_key == "change-me-in-production":
            missing.append("SECRET_KEY")
        if not self.database_url:
            missing.append("DATABASE_URL")
        if missing:
            raise ValueError(f"Missing required settings: {', '.join(missing)}")
        return self


settings = Settings()