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

from pydantic import EmailStr, validator
from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    PROJECT_NAME: str = "Task Manager API"
    API_V1_STR: str = "/api/v1"
    SECRET_KEY: str = secrets.token_urlsafe(32)
    # 60 minutes * 24 hours * 8 days = 8 days
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8
    
    # CORS Configuration
    BACKEND_CORS_ORIGINS: List[str] = ["*"]

    @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)

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

    # Users
    USERS_OPEN_REGISTRATION: bool = True
    
    # First Superuser
    FIRST_SUPERUSER_EMAIL: EmailStr = "admin@example.com"
    FIRST_SUPERUSER_USERNAME: str = "admin"
    FIRST_SUPERUSER_PASSWORD: str = "admin123"

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


settings = Settings()