from __future__ import annotations

import os
import secrets
from typing import List, Optional, Union

from pydantic import AnyHttpUrl, EmailStr, field_validator
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    API_V1_STR: str = "/api/v1"
    SECRET_KEY: str = os.environ.get("SECRET_KEY", secrets.token_urlsafe(32))
    # 60 minutes * 24 hours * 8 days = 8 days
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8
    # BACKEND_CORS_ORIGINS is a comma-separated list of origins
    # e.g: "http://localhost,http://localhost:4200,http://localhost:3000"
    BACKEND_CORS_ORIGINS: List[AnyHttpUrl] = []

    @field_validator("BACKEND_CORS_ORIGINS", mode="before")
    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(",")]
        if isinstance(v, (list, str)):
            return v
        raise ValueError(v)

    PROJECT_NAME: str = "Kids Learning Gamification API"
    PROJECT_DESCRIPTION: str = "API for a gamified learning platform for kids"
    VERSION: str = "0.1.0"

    # Database configuration
    SQLALCHEMY_DATABASE_URI: Optional[str] = None

    # JWT token configuration
    ALGORITHM: str = "HS256"

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

    model_config = SettingsConfigDict(case_sensitive=True)


settings = Settings()