"""Application configuration via environment variables."""

from __future__ import annotations

import os
from functools import lru_cache
from pydantic_settings import BaseSettings


class Settings(BaseSettings):
    """All config comes from environment variables or .env file."""

    # App
    app_name: str = "ISP Handbook OCR Engine"
    app_version: str = "1.0.0"
    debug: bool = False
    port: int = 7860  # Hugging Face Spaces default

    # Upload
    max_upload_bytes: int = 100 * 1024 * 1024  # 100 MB
    upload_dir: str = "/tmp/handbook_uploads"
    export_dir: str = "/tmp/handbook_exports"

    # OCR
    tesseract_cmd: str = ""  # blank = auto-detect
    ocr_dpi: int = 300
    ocr_language: str = "eng"
    ocr_timeout_seconds: int = 300  # 5 min per document

    # External API
    api_base_url: str = "https://finsapdev.qhtestingserver.com"
    handbook_import_path: str = "/MODEL_APIS/handbook_import_export.php"

    # CORS
    cors_origins: str = (
        "http://localhost:5173,http://localhost:5174,"
        "http://127.0.0.1:5173,http://127.0.0.1:5174,"
        "https://finsapdev.qhtestingserver.com,"
        "https://internationalscholarsdev.qhtestingserver.com"
    )

    model_config = {
        "env_file": ".env",
        "env_file_encoding": "utf-8",
        "extra": "ignore",
    }

    @property
    def cors_origins_list(self) -> list[str]:
        return [o.strip() for o in self.cors_origins.split(",") if o.strip()]

    @property
    def handbook_import_url(self) -> str:
        return self.api_base_url.rstrip("/") + self.handbook_import_path


@lru_cache()
def get_settings() -> Settings:
    return Settings()