"""在匹配图上绘制模板四角透视框（多边形）。"""

from __future__ import annotations

from pathlib import Path

import cv2
import numpy as np

from routing import repo_path


def draw_rect(
    corners_xy: np.ndarray | list,
    *,
    match_image: str | Path,
    output_path: str | Path,
    outline_color_bgr: tuple[int, int, int] = (0, 255, 0),
    outline_thickness_pixels: int = 6,
) -> Path:
    """
    ``corners_xy``：``(4, 2)`` 顶点顺序与 ``corner_points_on_match_img`` 一致（闭合四边形）。
    """
    scr = repo_path(match_image)
    bgr = cv2.imread(str(scr), cv2.IMREAD_COLOR)
    if bgr is None:
        raise FileNotFoundError(f"无法读取匹配图：{scr}")

    pts = np.asarray(corners_xy, dtype=np.float64).reshape(4, 2)
    if pts.shape != (4, 2) or not np.all(np.isfinite(pts)):
        raise ValueError("corners_xy 须为 (4, 2) 有限坐标")

    pi = pts.astype(np.int32).reshape(-1, 1, 2)
    cv2.polylines(
        bgr,
        [pi],
        isClosed=True,
        color=outline_color_bgr,
        thickness=int(outline_thickness_pixels),
        lineType=cv2.LINE_AA,
    )

    out = repo_path(output_path)
    out.parent.mkdir(parents=True, exist_ok=True)
    if not cv2.imwrite(str(out), bgr):
        raise OSError(f"无法写入：{out}")
    return out