from pathlib import Path
from typing import List, Optional, Union

from pydantic import AnyHttpUrl, EmailStr, validator
from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    # Base Settings
    PROJECT_NAME: str = "User Authentication Service"
    API_V1_STR: str = "/api/v1"

    # Database Settings
    DB_DIR: Path = Path("/app") / "storage" / "db"
    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"

    # JWT Settings
    SECRET_KEY: str = "CHANGE_THIS_TO_A_SECURE_SECRET_IN_PRODUCTION"
    ALGORITHM: str = "HS256"
    # 60 minutes * 24 hours * 7 days = 7 days
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 7

    # CORS Settings
    BACKEND_CORS_ORIGINS: List[Union[str, AnyHttpUrl]] = ["*"]

    @validator("BACKEND_CORS_ORIGINS", pre=True)
    def assemble_cors_origins(cls, v: Union[str, List[str]]) -> Union[List[str], str]:
        if isinstance(v, str) and not v.startswith("["):
            return [i.strip() for i in v.split(",")]
        elif isinstance(v, (list, str)):
            return v
        raise ValueError(v)

    # Email Settings
    EMAILS_FROM_EMAIL: Optional[EmailStr] = None
    EMAILS_FROM_NAME: Optional[str] = None

    class Config:
        case_sensitive = True
        env_file = ".env"


# Create settings object
settings = Settings()

# Ensure DB directory exists
settings.DB_DIR.mkdir(parents=True, exist_ok=True)