#!/usr/bin/env python3
import json
import urllib.parse
import urllib.request
from http.server import BaseHTTPRequestHandler, HTTPServer


def _json_get(path: str):
    with urllib.request.urlopen(f"http://127.0.0.1:9222{path}", timeout=2) as resp:
        return json.loads(resp.read().decode("utf-8"))


def _json_put(path: str):
    req = urllib.request.Request(f"http://127.0.0.1:9222{path}", method="PUT")
    with urllib.request.urlopen(req, timeout=2) as resp:
        return json.loads(resp.read().decode("utf-8"))


def chromium_open(url: str) -> None:
    encoded = urllib.parse.quote(url, safe=':/?#[]@!$&\'()*+,;=%')
    opened = _json_put(f"/json/new?{encoded}")
    opened_id = opened.get("id")
    # Keep exactly one active page tab to prevent tab/memory explosion in warm containers.
    pages = _json_get("/json/list")
    for page in pages:
        page_id = page.get("id")
        if page_id and page_id != opened_id:
            try:
                _json_put(f"/json/close/{page_id}")
            except Exception:
                pass


class Handler(BaseHTTPRequestHandler):
    def _json(self, code: int, payload: dict):
        body = json.dumps(payload).encode("utf-8")
        self.send_response(code)
        self.send_header("Content-Type", "application/json")
        self.send_header("Content-Length", str(len(body)))
        self.end_headers()
        self.wfile.write(body)

    def do_GET(self):
        if self.path == "/health":
            self._json(200, {"ok": True})
            return
        self._json(404, {"detail": "Not found"})

    def do_POST(self):
        if self.path != "/open":
            self._json(404, {"detail": "Not found"})
            return
        try:
            length = int(self.headers.get("Content-Length", "0"))
            raw = self.rfile.read(length)
            data = json.loads(raw.decode("utf-8")) if raw else {}
            url = (data.get("url") or "").strip()
            if not url.startswith("http://") and not url.startswith("https://"):
                self._json(400, {"detail": "Invalid URL"})
                return
            chromium_open(url)
            print(f"open_ok url={url}", flush=True)
            self._json(200, {"ok": True, "url": url})
        except Exception as exc:
            print(f"open_fail err={exc}", flush=True)
            self._json(500, {"detail": str(exc)})

    def log_message(self, format, *args):
        return


if __name__ == "__main__":
    server = HTTPServer(("0.0.0.0", 7000), Handler)
    server.serve_forever()