"""Centralized application settings — loaded from environment variables."""

from __future__ import annotations

import os
from dataclasses import dataclass, field


@dataclass(frozen=True)
class Settings:
    app_version: str = "dev"
    conversion_engine: str = "local"  # "local" or "remote"
    docling_serve_url: str = "http://localhost:5001"
    docling_serve_api_key: str | None = None
    conversion_timeout: int = 600
    upload_dir: str = "./uploads"
    db_path: str = "./data/docling_studio.db"
    cors_origins: list[str] = field(
        default_factory=lambda: ["http://localhost:3000", "http://localhost:5173"]
    )

    @classmethod
    def from_env(cls) -> Settings:
        cors_raw = os.environ.get("CORS_ORIGINS", "http://localhost:3000,http://localhost:5173")
        return cls(
            app_version=os.environ.get("APP_VERSION", "dev"),
            conversion_engine=os.environ.get("CONVERSION_ENGINE", "local"),
            docling_serve_url=os.environ.get("DOCLING_SERVE_URL", "http://localhost:5001"),
            docling_serve_api_key=os.environ.get("DOCLING_SERVE_API_KEY"),
            conversion_timeout=int(os.environ.get("CONVERSION_TIMEOUT", "600")),
            upload_dir=os.environ.get("UPLOAD_DIR", "./uploads"),
            db_path=os.environ.get("DB_PATH", "./data/docling_studio.db"),
            cors_origins=[o.strip() for o in cors_raw.split(",")],
        )