"""
Application configuration using pydantic-settings.
Loads from environment variables and .env file.
"""

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


class Settings(BaseSettings):
    """Application settings loaded from environment."""

    # Paths
    data_dir: Path = Path(__file__).parent.parent / "data"
    frontend_dir: Path = Path(__file__).parent.parent / "frontend"

    # Server
    host: str = "0.0.0.0"
    port: int = 80
    debug: bool = False  # Set to False in production

    # Database
    database_url: str = "postgresql://schoolcompare:schoolcompare@localhost:5432/schoolcompare"

    # CORS - Production should only allow the actual domain
    allowed_origins: List[str] = ["https://schoolcompare.co.uk"]

    # API
    default_page_size: int = 50
    max_page_size: int = 100

    # Security
    admin_api_key: str = Field(default_factory=lambda: secrets.token_urlsafe(32))
    rate_limit_per_minute: int = 60  # Requests per minute per IP
    rate_limit_burst: int = 10  # Allow burst of requests
    max_request_size: int = 1024 * 1024  # 1MB max request size

    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"
        extra = "ignore"


# Singleton instance
settings = Settings()