"""
统一配置：密钥与连接串经 .env / Settings；其余非密钥项见 config/*.toml（AppConfig）。

本地开发时由 api/development.sh 在启动前将 .env.development 同步为 .env。
"""

from __future__ import annotations

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

from app.core.app_config_models import DeployConfig
from app.core.redis_urls import resolve_redis_urls

_DEV_SECRET_KEY = "dev-only-secret-key-do-not-use-in-production"

_DEPLOY_FIELD_NAMES = frozenset(DeployConfig.model_fields.keys())


class Settings(BaseSettings):
    """Secrets and bootstrap only — non-secret deploy/product config lives in TOML."""

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

    database_url: str = "postgresql://postgres:postgres@localhost:48291/life_echo"
    redis_url: str = "redis://localhost:48307/0"
    redis_password: str = ""
    celery_redis_url: str = ""
    app_environment: str = Field(
        default="development",
        validation_alias=AliasChoices("APP_ENV", "APP_ENVIRONMENT"),
    )

    secret_key: str = _DEV_SECRET_KEY
    deepseek_api_key: str = ""
    zhipu_api_key: str = ""

    tencent_secret_id: str = ""
    tencent_secret_key: str = ""
    tencent_app_id: str = ""

    wechat_pay_api_v3_key: str = ""
    wechat_pay_private_key: str = ""
    wechat_pay_platform_public_key: str = ""

    alipay_private_key: str = ""
    alipay_public_key: str = ""

    liblib_access_key: str = ""
    liblib_secret_key: str = ""

    internal_eval_api_key: str = ""

    google_token_verifier_secret: str = ""

    @model_validator(mode="after")
    def _validate_secret_key(self) -> "Settings":
        env = (self.app_environment or "").strip().lower()
        if env in ("production", "staging") and (
            not self.secret_key or self.secret_key == _DEV_SECRET_KEY
        ):
            raise ValueError(
                "SECRET_KEY must be set to a strong random value in production/staging"
            )
        return self

    @property
    def is_production(self) -> bool:
        return (self.app_environment or "").strip().lower() == "production"

    @property
    def enable_test_subscription(self) -> bool:
        return not self.is_production

    @property
    def enable_test_plan(self) -> bool:
        return not self.is_production

    @property
    def redis_url_resolved(self) -> str:
        business, _ = resolve_redis_urls(
            self.redis_url,
            redis_password=self.redis_password or None,
            celery_redis_url_override=None,
        )
        return business

    @property
    def celery_redis_url_resolved(self) -> str:
        override = (self.celery_redis_url or "").strip() or None
        _, celery = resolve_redis_urls(
            self.redis_url,
            redis_password=self.redis_password or None,
            celery_redis_url_override=override,
        )
        return celery


class SettingsFacade:
    """Backward-compatible facade: secrets from Settings, deploy flags from TOML."""

    __slots__ = ("_secrets",)

    def __init__(self, secrets: Settings) -> None:
        object.__setattr__(self, "_secrets", secrets)

    @property
    def _deploy(self) -> DeployConfig:
        from app.core.app_config import get_app_config

        return get_app_config().deploy

    def __getattr__(self, name: str):
        secrets = object.__getattribute__(self, "_secrets")
        if hasattr(secrets, name):
            return getattr(secrets, name)
        if name in _DEPLOY_FIELD_NAMES:
            return getattr(self._deploy, name)
        raise AttributeError(f"Settings has no attribute {name!r}")

    def __setattr__(self, name: str, value) -> None:
        if name == "_secrets":
            object.__setattr__(self, name, value)
            return
        secrets = object.__getattribute__(self, "_secrets")
        if hasattr(type(secrets), name) and name not in _DEPLOY_FIELD_NAMES:
            setattr(secrets, name, value)
            return
        if name in _DEPLOY_FIELD_NAMES:
            setattr(self._deploy, name, value)
            return
        setattr(secrets, name, value)


settings = SettingsFacade(Settings())