"""应用全局配置模块。

通过 pydantic-settings 从 .env 文件和环境变量加载配置，
使用 lru_cache 保证全局单例。所有配置项均可通过环境变量覆盖。
"""

from functools import lru_cache
from pathlib import Path

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


BASE_DIR = Path(__file__).resolve().parents[2]
ENV_FILE = BASE_DIR / ".env"


class Settings(BaseSettings):
    """应用配置类，包含数据库、JWT、OSS、AI、微信等全部配置项。

    属性:
        app_env: 运行环境（dev/test/prod）。
        secret_key: JWT 签名密钥。
        jwt_expire_minutes: JWT 有效期（分钟）。
        mysql_*: MySQL 数据库连接配置。
        aliyun_oss_*: 阿里云 OSS 文件存储配置。
        ai_provider: AI 服务提供方（mock/aliyun）。
        wechat_*: 微信小程序通知配置。
        llm_parse_*: 大模型解析订单配置。
    """
    model_config = SettingsConfigDict(
        env_file=str(ENV_FILE),
        env_file_encoding="utf-8",
        extra="ignore",
    )

    app_env: str = Field(default="dev", alias="APP_ENV")
    app_name: str = Field(default="order-flow", alias="APP_NAME")
    api_prefix: str = Field(default="/api", alias="API_PREFIX")
    secret_key: str = Field(default="change-me", alias="SECRET_KEY")
    jwt_expire_minutes: int = Field(default=1440, alias="JWT_EXPIRE_MINUTES")
    auth_token_store_path: str = Field(default="D:/tmp/order-flow-auth/revoked_tokens.json", alias="AUTH_TOKEN_STORE_PATH")
    cors_allow_origins: str = Field(default="http://localhost:5173", alias="CORS_ALLOW_ORIGINS")
    mysql_host: str = Field(default="127.0.0.1", alias="MYSQL_HOST")
    mysql_port: int = Field(default=3306, alias="MYSQL_PORT")
    mysql_database: str = Field(default="order_flow", alias="MYSQL_DATABASE")
    mysql_user: str = Field(default="order_user", alias="MYSQL_USER")
    mysql_password: str = Field(default="password", alias="MYSQL_PASSWORD")
    sql_echo: bool = Field(default=False, alias="SQL_ECHO")
    redis_host: str = Field(default="127.0.0.1", alias="REDIS_HOST")
    redis_port: int = Field(default=6379, alias="REDIS_PORT")
    redis_db: int = Field(default=0, alias="REDIS_DB")
    redis_password: str = Field(default="", alias="REDIS_PASSWORD")
    aliyun_oss_bucket: str = Field(default="bucket-name", alias="ALIYUN_OSS_BUCKET")
    aliyun_oss_endpoint: str = Field(default="oss-cn-hangzhou.aliyuncs.com", alias="ALIYUN_OSS_ENDPOINT")
    aliyun_oss_public_base_url: str = Field(default="https://cdn.example.com", alias="ALIYUN_OSS_PUBLIC_BASE_URL")
    aliyun_oss_access_key_id: str = Field(default="xxx", alias="ALIYUN_OSS_ACCESS_KEY_ID")
    aliyun_oss_access_key_secret: str = Field(default="xxx", alias="ALIYUN_OSS_ACCESS_KEY_SECRET")
    oss_signed_url_expire_seconds: int = Field(default=3600, alias="OSS_SIGNED_URL_EXPIRE_SECONDS")
    oss_upload_max_image_mb: int = Field(default=10, alias="OSS_UPLOAD_MAX_IMAGE_MB")
    oss_upload_max_video_mb: int = Field(default=200, alias="OSS_UPLOAD_MAX_VIDEO_MB")
    ai_provider: str = Field(default="mock", alias="AI_PROVIDER")
    aliyun_ai_region: str = Field(default="cn-hangzhou", alias="ALIYUN_AI_REGION")
    aliyun_ai_access_key_id: str = Field(default="xxx", alias="ALIYUN_AI_ACCESS_KEY_ID")
    aliyun_ai_access_key_secret: str = Field(default="xxx", alias="ALIYUN_AI_ACCESS_KEY_SECRET")
    logistics_trace_provider: str = Field(default="internal", alias="LOGISTICS_TRACE_PROVIDER")
    logistics_trace_endpoint: str = Field(default="", alias="LOGISTICS_TRACE_ENDPOINT")
    logistics_trace_path: str = Field(default="", alias="LOGISTICS_TRACE_PATH")
    logistics_trace_app_code: str = Field(default="", alias="LOGISTICS_TRACE_APPCODE")
    kuaidi100_key: str = Field(default="", alias="KUAIDI100_KEY")
    kuaidi100_customer: str = Field(default="", alias="KUAIDI100_CUSTOMER")
    kuaidi100_secret: str = Field(default="", alias="KUAIDI100_SECRET")
    kuaidi100_userid: str = Field(default="", alias="KUAIDI100_USERID")
    wechat_app_id: str = Field(default="", alias="WECHAT_APP_ID")
    wechat_app_secret: str = Field(default="", alias="WECHAT_APP_SECRET")
    wechat_template_order_status: str = Field(default="", alias="WECHAT_TEMPLATE_ORDER_STATUS")
    wechat_template_approval: str = Field(default="", alias="WECHAT_TEMPLATE_APPROVAL")
    wechat_template_task_assigned: str = Field(default="", alias="WECHAT_TEMPLATE_TASK_ASSIGNED")
    wechat_template_logistics_timeout: str = Field(default="", alias="WECHAT_TEMPLATE_LOGISTICS_TIMEOUT")
    wechat_template_arrears: str = Field(default="", alias="WECHAT_TEMPLATE_ARREARS")
    wechat_template_inactive_customer: str = Field(default="", alias="WECHAT_TEMPLATE_INACTIVE_CUSTOMER")
    llm_parse_enabled: bool = Field(default=True, alias="LLM_PARSE_ENABLED")
    llm_parse_model: str = Field(default="qwen-plus", alias="LLM_PARSE_MODEL")
    llm_parse_api_key: str = Field(default="", alias="LLM_PARSE_API_KEY")
    llm_parse_api_url: str = Field(
        default="https://dashscope.aliyuncs.com/compatible-mode/v1/chat/completions",
        alias="LLM_PARSE_API_URL",
    )

    @property
    def cors_origins(self) -> list[str]:
        """将逗号分隔的 CORS 白名单字符串解析为列表。"""
        return [item.strip() for item in self.cors_allow_origins.split(",") if item.strip()]


@lru_cache
def get_settings() -> Settings:
    """获取全局配置单例，首次调用时从 .env 加载，后续调用返回缓存。

    Returns:
        Settings: 应用配置实例。
    """
    return Settings()