from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path
from typing import Any, Optional

import yaml


@dataclass(frozen=True)
class AppConfig:
    umi_ocr_url: str
    prefer_mss: bool = True
    default_region: Optional[tuple[int, int, int, int]] = None  # left, top, width, height
    click_pause: float = 0.05


def load_config(path: str | Path) -> AppConfig:
    p = Path(path)
    data: dict[str, Any] = yaml.safe_load(p.read_text(encoding="utf-8")) or {}

    umi_ocr = data.get("umi_ocr", {}) or {}
    screenshot = data.get("screenshot", {}) or {}
    click = data.get("click", {}) or {}

    region = screenshot.get("default_region")
    default_region: Optional[tuple[int, int, int, int]]
    if region is None:
        default_region = None
    else:
        if not (isinstance(region, (list, tuple)) and len(region) == 4):
            raise ValueError("config.yaml screenshot.default_region 必须是 null 或 [left, top, width, height]")
        default_region = (int(region[0]), int(region[1]), int(region[2]), int(region[3]))

    return AppConfig(
        umi_ocr_url=str(umi_ocr.get("url", "http://127.0.0.1:1224/api/ocr")),
        prefer_mss=bool(screenshot.get("prefer_mss", True)),
        default_region=default_region,
        click_pause=float(click.get("pause", 0.05)),
    )