import http.server, json, sys

PORT = int(sys.argv[1])
DATA_FILE = sys.argv[2]

class Handler(http.server.BaseHTTPRequestHandler):
    def log_message(self, fmt, *args):
        pass

    def _read_body(self):
        length = int(self.headers.get("Content-Length", 0))
        return json.loads(self.rfile.read(length)) if length else {}

    def _json(self, code, body):
        data = json.dumps(body).encode()
        self.send_response(code)
        self.send_header("Content-Type", "application/json")
        self.end_headers()
        self.wfile.write(data)

    def do_POST(self):
        if self.path == "/api/annotations":
            body = self._read_body()
            try:
                with open(DATA_FILE) as f:
                    annotations = json.load(f)
            except Exception:
                annotations = []
            aid = len(annotations) + 1
            body["id"] = aid
            annotations.append(body)
            with open(DATA_FILE, "w") as f:
                json.dump(annotations, f)
            self._json(200, {"id": aid, "message": "Annotation added"})
        else:
            self.send_response(404)
            self.end_headers()

    def do_PATCH(self):
        if self.path.startswith("/api/annotations/"):
            aid = int(self.path.rsplit("/", 1)[-1])
            body = self._read_body()
            try:
                with open(DATA_FILE) as f:
                    annotations = json.load(f)
            except Exception:
                annotations = []
            for a in annotations:
                if a["id"] == aid:
                    a.update(body)
            with open(DATA_FILE, "w") as f:
                json.dump(annotations, f)
            self._json(200, {"message": "Annotation patched"})
        else:
            self.send_response(404)
            self.end_headers()

http.server.HTTPServer(("127.0.0.1", PORT), Handler).serve_forever()