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",
        extra="ignore",
    )

    # 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"
    openai_model: str = "gpt-4o-mini"
    tts_model: str = ""
    image_model: str = "nano-banana-pro"
    tts_minimax_model: str = "speech-2.6-turbo"
    tts_elevenlabs_model: str = "eleven_multilingual_v2"
    tts_edge_voice: str = "zh-CN-XiaoxiaoNeural"
    antigravity_model: str = "gemini-3-pro-image"

    # 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"])
    storybook_providers: list[str] = Field(default_factory=lambda: ["storybook_primary"])
    enable_demo_providers: bool = Field(
        False,
        description="Enable local deterministic demo providers for portfolio demos",
    )
    story_audio_cache_dir: str = Field(
        "storage/audio",
        description="Directory for cached story audio files",
    )
    story_audio_cache_ttl_days: int = Field(
        30,
        description="TTL in days before cached story audio is pruned",
    )
    generation_job_stale_minutes: int = Field(
        60,
        description="Minutes before a running generation job is considered stale",
    )

    # 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")
    redis_sentinel_enabled: bool = Field(False, description="Whether to enable Redis Sentinel")
    redis_sentinel_nodes: str = Field(
        "",
        description="Comma-separated Redis Sentinel nodes, e.g. host1:26379,host2:26379",
    )
    redis_sentinel_master_name: str = Field("mymaster", description="Redis Sentinel master name")
    redis_sentinel_password: str = Field("", description="Password for Redis Sentinel (optional)")
    redis_sentinel_db: int = Field(0, description="Redis DB index when using Sentinel")
    redis_sentinel_socket_timeout: float = Field(
        0.5,
        description="Socket timeout in seconds for Sentinel clients",
    )

    # Admin console
    enable_admin_console: bool = False
    admin_username: str = "admin"
    admin_password: str = ""

    # 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 self.redis_sentinel_enabled and not self.redis_sentinel_nodes.strip():
            missing.append("REDIS_SENTINEL_NODES")
        if missing:
            raise ValueError(f"Missing required settings: {', '.join(missing)}")
        if self.enable_admin_console:
            weak_admin_passwords = {"", "admin", "admin123", "password", "change-me"}
            if not self.debug and self.admin_password in weak_admin_passwords:
                raise ValueError(
                    "ADMIN_PASSWORD must be set to a strong value when admin console is enabled"
                )
        return self

    @property
    def redis_sentinel_hosts(self) -> list[tuple[str, int]]:
        """Parse Redis Sentinel nodes into (host, port) tuples."""
        nodes = []
        raw = self.redis_sentinel_nodes.strip()
        if not raw:
            return nodes

        for item in raw.split(","):
            value = item.strip()
            if not value:
                continue
            if ":" not in value:
                raise ValueError(f"Invalid sentinel node format: {value}")
            host, port_text = value.rsplit(":", 1)
            if not host:
                raise ValueError(f"Invalid sentinel node host: {value}")
            try:
                port = int(port_text)
            except ValueError as exc:
                raise ValueError(f"Invalid sentinel node port: {value}") from exc
            nodes.append((host, port))
        return nodes

    @property
    def redis_sentinel_urls(self) -> list[str]:
        """Build Celery-compatible Sentinel URLs with DB index."""
        return [
            f"sentinel://{host}:{port}/{self.redis_sentinel_db}"
            for host, port in self.redis_sentinel_hosts
        ]


settings = Settings()