#!/usr/bin/env python3
"""
analyze.py — 单张图片坐姿检测

用法：
    python analyze.py <image_path>
    python analyze.py <image_path> --save
    python analyze.py <image_path> --save <output_path>
"""

import argparse
import os
import sys
from pathlib import Path

# 切换到脚本所在目录，确保 load_model.py 里的相对路径（./data/inference_models/）能正确找到模型
os.chdir(Path(__file__).parent)

import sys
import types

# yolov5 兼容 shim（新版 huggingface_hub 移除了 utils._errors 子模块）
try:
    import huggingface_hub.utils._errors  # noqa: F401
except (ModuleNotFoundError, ImportError):
    import huggingface_hub.errors as _hf_errors
    _shim = types.ModuleType("huggingface_hub.utils._errors")
    for _name in dir(_hf_errors):
        setattr(_shim, _name, getattr(_hf_errors, _name))
    sys.modules["huggingface_hub.utils._errors"] = _shim

import torch

# PyTorch 2.6+ 默认 weights_only=True，旧版 yolov5 模型需要关闭
_orig_torch_load = torch.load
def _patched_torch_load(*args, **kwargs):
    kwargs.setdefault("weights_only", False)
    return _orig_torch_load(*args, **kwargs)
torch.load = _patched_torch_load

import cv2
from app_models.load_model import InferenceModel


def draw_result(img, x1, y1, x2, y2, label, conf):
    """在原图上叠加黄色检测框和标签"""
    color = (0, 255, 255)  # 黄色 (BGR)
    cv2.rectangle(img, (x1, y1), (x2, y2), color, 2)
    text = f"{label} {conf:.2f}"
    # 标签背景，防止文字看不清
    (tw, th), _ = cv2.getTextSize(text, cv2.FONT_HERSHEY_SIMPLEX, 0.7, 2)
    cv2.rectangle(img, (x1, y1 - th - 10), (x1 + tw + 4, y1), color, -1)
    cv2.putText(img, text, (x1 + 2, y1 - 6),
                cv2.FONT_HERSHEY_SIMPLEX, 0.7, (0, 0, 0), 2)
    return img


def main():
    parser = argparse.ArgumentParser(description="坐姿检测（YOLOv5）")
    parser.add_argument("image", help="输入图片路径（JPG / PNG）")
    parser.add_argument(
        "--save",
        nargs="?",
        const="",          # --save 不带路径时用默认名
        metavar="OUTPUT",
        help="保存标注图；不指定路径则存为 <原文件名>_result.jpg",
    )
    args = parser.parse_args()

    image_path = Path(args.image).resolve()
    if not image_path.exists():
        print(f"错误：找不到图片 {image_path}")
        sys.exit(1)

    # 读图
    img = cv2.imread(str(image_path))
    if img is None:
        print(f"错误：无法读取图片 {image_path}")
        sys.exit(1)

    # 加载模型 & 推理
    model = InferenceModel("small640.pt")
    results = model.predict(img)
    x1, y1, x2, y2, cls, conf = InferenceModel.get_results(results)

    # 模型已设 conf=0.50，结果为空说明低于阈值
    if cls is None:
        print("未检测到人")
        return

    label = "good" if cls == 0 else "bad"
    print(f"姿势：{label}（置信度 {conf:.2f}）")
    print(f"BBox：[x1={x1}, y1={y1}, x2={x2}, y2={y2}]")

    # 保存标注图（仅在 --save 时）
    if args.save is not None:
        if args.save == "":
            output_path = image_path.parent / (image_path.stem + "_result" + image_path.suffix)
        else:
            output_path = Path(args.save)
        annotated = draw_result(img.copy(), x1, y1, x2, y2, label, conf)
        cv2.imwrite(str(output_path), annotated)
        print(f"标注图已保存：{output_path}")


if __name__ == "__main__":
    main()