const http = require("http");
const os = require("os");
const fs = require("fs");
const path = require("path");
const { read } = require("./lib/state");

const TOKEN = process.env.STATUS_TOKEN || "";
const PORT = Number(process.env.PORT || process.env.STATUS_PORT || 0);

function okAuth(req) {
  if (!TOKEN) return false;
  const h = req.headers["authorization"] || "";
  const bearer = h.startsWith("Bearer ") ? h.slice(7) : "";
  const url = new URL(req.url, "http://x");
  const q = url.searchParams.get("token") || "";
  return bearer === TOKEN || q === TOKEN;
}
function fmt(ts) {
  if (!ts) return "never";
  const d = new Date(ts);
  return d.toLocaleString();
}

const server = http.createServer((req, res) => {
  if (req.method === "GET" && req.url === "/health") {
    res.writeHead(200, { "Content-Type": "application/json" });
    return res.end(JSON.stringify({ ok: true }));
  }

  if (!okAuth(req)) {
    res.writeHead(401, { "Content-Type": "application/json" });
    return res.end(JSON.stringify({ error: "unauthorized" }));
  }

  if (req.method === "GET" && (req.url.startsWith("/api/status"))) {
    const s = read();
    res.writeHead(200, {
      "Content-Type": "application/json",
      "Cache-Control": "no-store",
      "Access-Control-Allow-Origin": "*"
    });
    return res.end(JSON.stringify({
      host: os.hostname(),
      uptimeSec: Math.floor(process.uptime()),
      data: s
    }));
  }

  if (req.method === "GET" && (req.url === "/status" || req.url === "/")) {
    const s = read();
    const keys = Object.keys(s).sort();
    let rows = "";
    for (const k of keys) rows += `<tr><td>${k}</td><td>${fmt(s[k])}</td></tr>`;
    const html = `<!doctype html>
<html><head>
<meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
<title>skynet status</title>
<style>
body{font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial;max-width:900px;margin:24px auto;padding:12px}
h1{font-size:22px;margin:0 0 12px}
table{width:100%;border-collapse:collapse}
td,th{border:1px solid #ddd;padding:8px;font-size:14px}
tr:nth-child(even){background:#fafafa}
small{color:#666}
</style>
</head>
<body>
<h1>skynet status</h1>
<small>host ${os.hostname()} uptime ${Math.floor(process.uptime())}s</small>
<table>
<tr><th>key</th><th>time</th></tr>
${rows}
</table>
</body></html>`;
    res.writeHead(200, { "Content-Type": "text/html", "Cache-Control": "no-store" });
    return res.end(html);
  }

  res.writeHead(404);
  res.end("not found");
});

server.listen(PORT, "0.0.0.0", () => {
  const addr = server.address();
  const port = typeof addr === "object" && addr ? addr.port : 0;
  console.log("status up on port", port);
  try { fs.writeFileSync(path.join(os.homedir(), ".skynet_status_port"), String(port)); } catch {}
});