"""在图片上绘制绿色点并保存为 output/keypoint.png。

程序里可调用 ``draw_point(match_dict, \"output/point.png\")``，字典须含
``screenshot_image_path``、``matched_keypoints_original_xy``。

命令行示例（在仓库根目录执行）::

    python -m thirdparty.draw_point input/screenshot.png --npy points.npy
    python -m thirdparty.draw_point input/screenshot.png --xy \"100,200;300,400;500,600\"

.npy 形状须为 (N, 2) 或长度 2N 的一维数组（按 x0,y0,x1,y1,… 展开）。
"""

from __future__ import annotations

import argparse
import sys
from pathlib import Path

import cv2
import numpy as np

from routing import OUTPUT_DIR, repo_path

_OUTPUT_PATH = OUTPUT_DIR / "keypoint.png"


def _load_points_from_npy(path: Path) -> np.ndarray:
    arr = np.load(path, allow_pickle=False)
    if arr.ndim == 1:
        if arr.size % 2 != 0:
            raise ValueError(f"一维点数组长度须为偶数，当前 size={arr.size}")
        arr = arr.reshape(-1, 2)
    elif arr.ndim == 2:
        if arr.shape[1] != 2:
            raise ValueError(f".npy 二维数组形状须为 (N,2)，当前 {arr.shape}")
    else:
        raise ValueError(f"不支持的数组维度: {arr.ndim}")
    return arr.astype(np.float64)


def _parse_xy_string(s: str) -> np.ndarray:
    parts = [p.strip() for p in s.split(";") if p.strip()]
    if not parts:
        raise ValueError("未解析到任何点，格式示例：100,200;300,400")
    rows: list[list[float]] = []
    for p in parts:
        xy = [float(x.strip()) for x in p.split(",")]
        if len(xy) != 2:
            raise ValueError(f"每点须为 x,y，无效片段：{p!r}")
        rows.append(xy)
    return np.asarray(rows, dtype=np.float64)


def draw_point(
    match_dict: dict,
    output_image_path: str | Path | None = None,
    *,
    point_color_bgr: tuple[int, int, int] = (0, 255, 0),
    radius: int = 8,
    thickness: int = -1,
) -> Path:
    """在 ``match_dict['screenshot_image_path']`` 上绘制 ``matched_keypoints_original_xy``。"""
    out = (
        repo_path(output_image_path)
        if output_image_path is not None
        else _OUTPUT_PATH.resolve()
    )
    scr = repo_path(match_dict["screenshot_image_path"])
    raw = match_dict.get("matched_keypoints_original_xy")
    if raw is None:
        raise KeyError("match_dict 缺少 matched_keypoints_original_xy")
    pts = np.asarray(raw, dtype=np.float64).reshape(-1, 2)
    bgr = cv2.imread(str(scr), cv2.IMREAD_COLOR)
    if bgr is None:
        raise FileNotFoundError(f"无法读取截图：{scr}")
    for x, y in pts:
        cv2.circle(
            bgr,
            (int(round(x)), int(round(y))),
            radius,
            point_color_bgr,
            thickness,
            lineType=cv2.LINE_AA,
        )
    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


class DrawPoint:
    """Thin wrapper around :func:`draw_point` when you already have an ``(N, 2)`` array."""

    def __init__(
        self,
        points: np.ndarray | list,
        screenshot_image_path: str | Path,
        output_image_path: str | Path | None = None,
        *,
        point_color_bgr: tuple[int, int, int] = (0, 255, 0),
        radius: int = 8,
        thickness: int = -1,
    ) -> None:
        self._match_dict = {
            "screenshot_image_path": str(repo_path(screenshot_image_path)),
            "matched_keypoints_original_xy": np.asarray(points, dtype=np.float64).tolist(),
        }
        self._output_image_path = (
            repo_path(output_image_path) if output_image_path is not None else None
        )
        self._style = dict(
            point_color_bgr=point_color_bgr,
            radius=radius,
            thickness=thickness,
        )

    def draw_point(self) -> Path:
        return draw_point(self._match_dict, self._output_image_path, **self._style)


def main() -> None:
    parser = argparse.ArgumentParser(description="在截图上绘制关键点并保存。")
    parser.add_argument("screenshot", type=Path, help="截图路径（相对路径相对仓库根目录）")
    g = parser.add_mutually_exclusive_group(required=True)
    g.add_argument("--npy", type=Path, help="点坐标 .npy")
    g.add_argument("--xy", type=str, help='点列表，如 "100,200;300,400"')
    parser.add_argument(
        "-o",
        "--out",
        type=Path,
        default=_OUTPUT_PATH,
        help=f"输出路径（默认 {_OUTPUT_PATH}）",
    )
    parser.add_argument("--radius", type=int, default=8)
    args = parser.parse_args()
    if args.npy is not None:
        pts = _load_points_from_npy(repo_path(args.npy))
    else:
        pts = _parse_xy_string(args.xy)
    out_path = repo_path(args.out)
    d = {
        "screenshot_image_path": str(repo_path(args.screenshot)),
        "matched_keypoints_original_xy": pts.tolist(),
    }
    draw_point(d, out_path, radius=args.radius)
    print(f"已写入：{out_path}", flush=True)


if __name__ == "__main__":
    if sys.platform == "win32":
        for stream in (sys.stdout, sys.stderr):
            try:
                stream.reconfigure(encoding="utf-8")
            except Exception:
                pass
    main()


__all__ = ["draw_point", "DrawPoint"]