from pydantic_settings import BaseSettings
from typing import Optional, List
from pydantic import EmailStr, validator
import secrets
from pathlib import Path


class Settings(BaseSettings):
    # API Settings
    API_V1_STR: str = "/api"
    PROJECT_NAME: str = "Online Bookstore API"

    # Security
    SECRET_KEY: str = secrets.token_urlsafe(32)
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8  # 8 days

    # CORS
    BACKEND_CORS_ORIGINS: List[str] = ["*"]

    # Database
    DB_DIR: Path = Path("/app") / "storage" / "db"
    DATABASE_URL: Optional[str] = None

    @validator("DATABASE_URL", pre=True)
    def assemble_db_url(cls, v: Optional[str], values: dict) -> str:
        if v:
            return v
        db_dir = values.get("DB_DIR")
        db_dir.mkdir(parents=True, exist_ok=True)
        return f"sqlite:///{db_dir}/db.sqlite"

    # Email settings
    SMTP_TLS: bool = True
    SMTP_PORT: Optional[int] = None
    SMTP_HOST: Optional[str] = None
    SMTP_USER: Optional[str] = None
    SMTP_PASSWORD: Optional[str] = None
    EMAILS_FROM_EMAIL: Optional[EmailStr] = None
    EMAILS_FROM_NAME: Optional[str] = None

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


settings = Settings()