from pathlib import Path
from typing import ClassVar, List

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


class Settings(BaseSettings):
    PROJECT_NAME: str = "Small Business Inventory Management System"
    DESCRIPTION: str = "API for managing inventory for small businesses"
    VERSION: str = "0.1.0"
    API_V1_STR: str = "/api/v1"
    
    # SECURITY
    SECRET_KEY: str = "CHANGE_ME_IN_PRODUCTION"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 7  # 7 days
    
    # Database setup
    DB_DIR: ClassVar[Path] = Path("/app") / "storage" / "db"
    DB_DIR.mkdir(parents=True, exist_ok=True)
    SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"

    # CORS
    BACKEND_CORS_ORIGINS: List[AnyHttpUrl] = []

    @validator("BACKEND_CORS_ORIGINS", pre=True)
    def assemble_cors_origins(cls, v: str | List[str]) -> 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
    SMTP_TLS: bool = True
    SMTP_PORT: int | None = None
    SMTP_HOST: str | None = None
    SMTP_USER: str | None = None
    SMTP_PASSWORD: str | None = None
    EMAILS_FROM_EMAIL: EmailStr | None = None
    EMAILS_FROM_NAME: str | None = None

    @validator("EMAILS_FROM_NAME")
    def get_project_name(cls, v: str | None, values: dict) -> str:
        if not v:
            return values["PROJECT_NAME"]
        return v

    EMAIL_RESET_TOKEN_EXPIRE_HOURS: int = 48
    EMAIL_TEMPLATES_DIR: str = "/app/app/email-templates/build"
    EMAILS_ENABLED: bool = False

    @validator("EMAILS_ENABLED", pre=True)
    def get_emails_enabled(cls, v: bool, values: dict) -> bool:
        return bool(
            values.get("SMTP_HOST")
            and values.get("SMTP_PORT")
            and values.get("EMAILS_FROM_EMAIL")
        )

    model_config = {
        "case_sensitive": True,
        "env_file": ".env"
    }


settings = Settings()