from functools import lru_cache
from pathlib import Path
from urllib.parse import quote_plus

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


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

    app_env: str = "development"
    app_timezone: str = "Asia/Shanghai"
    jwt_secret: str = Field(default="change_me_to_a_long_random_string")
    token_expire_minutes: int = 60 * 24 * 30
    auto_create_tables: bool = False
    background_tasks_enabled: bool | None = None

    mysql_host: str = "127.0.0.1"
    mysql_port: int = 3306
    mysql_database: str = "jiaheng_erp"
    mysql_user: str = "root"
    mysql_password: str = ""

    wechat_app_id: str = ""
    wechat_app_secret: str = ""
    wechat_qr_env_version: str = "release"
    public_base_url: str = "http://127.0.0.1:8000"
    upload_dir: str = "uploads"

    @property
    def database_url(self) -> str:
        user = quote_plus(self.mysql_user)
        password = quote_plus(self.mysql_password)
        database = quote_plus(self.mysql_database)
        return (
            f"mysql+pymysql://{user}:{password}@"
            f"{self.mysql_host}:{self.mysql_port}/{database}?charset=utf8mb4"
        )

    @property
    def upload_path(self) -> Path:
        return Path(self.upload_dir).resolve()


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


settings = get_settings()