from functools import lru_cache

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict
from sqlalchemy.engine import URL


class Settings(BaseSettings):
    app_name: str = Field(default="Jiaheng Hardware ERP API", alias="APP_NAME")
    app_env: str = Field(default="dev", alias="APP_ENV")
    app_host: str = Field(default="0.0.0.0", alias="APP_HOST")
    app_port: int = Field(default=8000, alias="APP_PORT")
    api_prefix: str = "/api"
    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="jiaheng_erp", alias="MYSQL_DATABASE")
    mysql_user: str = Field(default="root", alias="MYSQL_USER")
    mysql_password: str = Field(default="replace_me", alias="MYSQL_PASSWORD")
    allowed_origins: str = Field(default="http://localhost:5173", alias="ALLOWED_ORIGINS")
    auth_secret_key: str = Field(default="jiaheng-erp-dev-secret-change-me", alias="AUTH_SECRET_KEY")
    auth_token_expire_minutes: int = Field(default=480, alias="AUTH_TOKEN_EXPIRE_MINUTES")

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

    @property
    def mysql_dsn(self) -> URL:
        return URL.create(
            "mysql+pymysql",
            username=self.mysql_user,
            password=self.mysql_password,
            host=self.mysql_host,
            port=self.mysql_port,
            database=self.mysql_database,
        )

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


@lru_cache
def get_settings() -> Settings:
    return Settings()