#!/usr/bin/env python3
"""
Gradio demo — 坐姿检测 / Sitting Posture Detection
HF Spaces 入口：sdk: gradio，app_file: app.py
"""

import sys
import types

# yolov5 内部引用了 huggingface_hub.utils._errors，新版 hf_hub 已将这些类移到
# huggingface_hub.errors。打一个向前兼容的 shim，避免 ImportError。
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+ 将 weights_only 默认改为 True，旧版 yolov5 模型需要兼容处理
_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
import gradio as gr
from app_models.load_model import InferenceModel

# 全局加载模型（避免每次请求重复加载）
MODEL = InferenceModel("small640.pt")


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


def analyze(image):
    """
    Gradio 推理函数
    image: numpy array (RGB，Gradio 默认格式)
    returns: (annotated_image_rgb, result_text)
    """
    if image is None:
        return None, "请上传图片"

    img_bgr = cv2.cvtColor(image, cv2.COLOR_RGB2BGR)

    results = MODEL.predict(img_bgr)
    x1, y1, x2, y2, cls, conf = InferenceModel.get_results(results)

    if cls is None:
        return image, "⚠️ 未检测到人（置信度低于 0.5）\n\n建议：请使用侧面角度的坐姿图片"

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

    annotated_bgr = draw_result(img_bgr.copy(), x1, y1, x2, y2, label, conf)
    annotated_rgb = cv2.cvtColor(annotated_bgr, cv2.COLOR_BGR2RGB)

    return annotated_rgb, result_text


demo = gr.Interface(
    fn=analyze,
    inputs=gr.Image(type="numpy", label="上传坐姿图片（建议侧面角度）"),
    outputs=[
        gr.Image(type="numpy", label="检测结果"),
        gr.Textbox(label="分析结果", lines=3),
    ],
    title="🪑 坐姿检测 / Sitting Posture Detection",
    description=(
        "上传一张**侧面坐姿图片**，自动识别好/坏坐姿。\n\n"
        "基于 YOLOv5s，训练数据为侧面标准座椅场景。"
    ),
    examples=[
        ["examples/bad_1.png"],
        ["examples/bad_2.png"],
        ["examples/good_1.png"],
    ],
    allow_flagging="never",
)

if __name__ == "__main__":
    demo.launch()