# -*- coding: utf-8 -*-
"""NudeNet 本地检测服务：由 Go 侧启动，常驻提供 /health 和 /detect。

只依赖 Python 标准库 + nudenet 包，模型在进程里只加载一次。
收到 /detect 就把图片路径丢给 NudeDetector，返回结果 JSON。
"""
import json
import sys
from http.server import BaseHTTPRequestHandler, HTTPServer

from nudenet import NudeDetector

# 只有这些"暴露部位"才算色情；其它如肚子/腋窝/脚踝暴露不判。
SENSITIVE = {
    "FEMALE_GENITALIA_EXPOSED",
    "MALE_GENITALIA_EXPOSED",
    "ANUS_EXPOSED",
    "FEMALE_BREAST_EXPOSED",
}

_detector = None


def get_detector():
    global _detector
    if _detector is None:
        _detector = NudeDetector()
    return _detector


class Handler(BaseHTTPRequestHandler):
    def _send(self, obj, status=200):
        data = json.dumps(obj, ensure_ascii=False).encode("utf-8")
        self.send_response(status)
        self.send_header("Content-Type", "application/json; charset=utf-8")
        self.send_header("Content-Length", str(len(data)))
        self.end_headers()
        self.wfile.write(data)

    def do_GET(self):
        if self.path == "/health":
            self._send({"ok": True})
        else:
            self._send({"ok": False, "error": "not found"}, 404)

    def do_POST(self):
        if self.path != "/detect":
            return self._send({"ok": False, "error": "not found"}, 404)
        length = int(self.headers.get("Content-Length", 0))
        try:
            body = json.loads(self.rfile.read(length) or b"{}")
            path = body.get("path", "")
            threshold = float(body.get("threshold", 0.5))
            detections = get_detector().detect(path)
        except Exception as exc:  # noqa: BLE001 - 服务端任何异常都要回给 Go，别让进程崩
            return self._send({"ok": False, "error": str(exc)})

        max_score = 0.0
        nsfw = False
        for det in detections or []:
            cls = det.get("class", "")
            sc = float(det.get("score", 0) or 0)
            if cls in SENSITIVE:
                if sc > max_score:
                    max_score = sc
                if sc >= threshold:
                    nsfw = True
        self._send({"ok": True, "nsfw": nsfw, "score": max_score, "detections": detections})

    def log_message(self, *args):  # 不刷屏
        pass


if __name__ == "__main__":
    port = int(sys.argv[1]) if len(sys.argv) > 1 else 0
    HTTPServer(("127.0.0.1", port), Handler).serve_forever()