from pathlib import Path
from typing import Any, Dict, Optional

from pydantic import BaseSettings, validator


class Settings(BaseSettings):
    # Base settings
    PROJECT_NAME: str = "Web Scraper CLI"
    PROJECT_DESCRIPTION: str = "A FastAPI-based web scraper with CLI interface"
    VERSION: str = "0.1.0"
    API_V1_STR: str = "/api/v1"

    # Server settings
    HOST: str = "0.0.0.0"
    PORT: int = 8000
    DEBUG: bool = True

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

    @validator("SQLALCHEMY_DATABASE_URL", pre=True)
    def validate_db_url(cls, v: Optional[str], values: Dict[str, Any]) -> str:
        """
        Ensure the database directory exists.
        """
        if isinstance(v, str) and v.startswith("sqlite"):
            db_dir = values.get("DB_DIR")
            if db_dir:
                db_dir.mkdir(parents=True, exist_ok=True)
            return v
        return v

    # Scraper settings
    DEFAULT_USER_AGENT: str = (
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 "
        "(KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36"
    )
    DEFAULT_TIMEOUT: int = 30  # seconds

    # Ratelimit settings
    DEFAULT_RATE_LIMIT: float = 1.0  # requests per second

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


settings = Settings()