// Renders the top-bar health badges + startup/recording state lines from /ws/status.
import { formatBytes, formatElapsed } from "/js/format.js";

function badgeClass(health) {
  if (health === "OK") return "badge badge-ok";
  if (health === "STALE") return "badge badge-stale";
  return "badge badge-down";
}

// NBSP padding, not CSS min-width: regular spaces collapse in rendered
// text, so a guessed ch-width can still drift. Padding to a fixed character
// count (monospace font) makes each badge's pixel width identical on every
// tick regardless of health word or Hz digit count — nothing to reflow the
// row on mobile.
function padHealth(health) {
  return health.padEnd(5, " ");
}

function formatHz(hz) {
  return hz.toFixed(1).padStart(5, " ");
}

function makeBadge(label, health, hz) {
  const b = document.createElement("span");
  // badge-sensor: fixed CSS width (see style.css) — the NBSP padding above
  // keeps internal jitter down, but the box's own size being fixed is what
  // actually guarantees the position never moves, regardless of icon glyph
  // width or font-metric rounding.
  b.className = `${badgeClass(health)} badge-sensor`;
  b.textContent = `${label} ${padHealth(health)}`;
  const hzSpan = document.createElement("span");
  hzSpan.className = "badge-hz";
  hzSpan.textContent = health !== "DOWN" && hz > 0
    ? `${formatHz(hz)}Hz`
    : `${" ".repeat(5)}Hz`;
  b.appendChild(hzSpan);
  return b;
}

export function startStatusSocket(onStatus) {
  const proto = location.protocol === "https:" ? "wss:" : "ws:";
  let ws;

  function connect() {
    ws = new WebSocket(`${proto}//${location.host}/ws/status`);
    ws.onmessage = (ev) => {
      const status = JSON.parse(ev.data);
      render(status);
      if (onStatus) onStatus(status);
    };
    ws.onclose = () => setTimeout(connect, 1500);
    ws.onerror = () => ws.close();
  }
  connect();
}

function render(status) {
  const badges = document.getElementById("status-badges");
  badges.innerHTML = "";

  badges.appendChild(makeBadge("LiDAR", status.lidar.health, status.lidar.hz));
  badges.appendChild(makeBadge("IMU", status.lidar.imu_health, status.lidar.imu_hz));
  badges.appendChild(makeBadge("MAP", status.map.health, status.map.hz));
  for (const cam of status.cameras) {
    badges.appendChild(makeBadge(cam.id, cam.health, cam.hz));
  }

  if (status.recording.active) {
    const b = document.createElement("span");
    b.className = "badge badge-rec";
    b.textContent = "REC";
    badges.appendChild(b);
  }

  const lidarState = document.getElementById("lidar-state");
  if (lidarState) {
    lidarState.textContent = status.lidar.running ? "● 실행 중" : "● 정지";
    lidarState.className = "state-line " + (status.lidar.running ? "on" : "off");
  }

  const recPath = document.getElementById("rec-path");
  if (recPath) {
    recPath.textContent = status.recording.path ? `저장: ${status.recording.path}` : "";
  }
  const recMeter = document.getElementById("rec-meter");
  if (recMeter) {
    if (status.recording.active) {
      recMeter.textContent = `${formatElapsed(status.recording.elapsed_s)} · ${formatBytes(status.recording.size_bytes)}`;
      recMeter.classList.remove("hidden");
    } else {
      recMeter.classList.add("hidden");
    }
  }

  // Always-on compact readout in the HUD — the backend already resolves the
  // right path (DEFAULT_SAVE_DIR when idle, the live recording target while
  // active), so this can just mirror status.disk unconditionally.
  const diskEl = document.getElementById("disk-free");
  if (diskEl && status.disk) {
    const freeGb = status.disk.free_gb;
    diskEl.textContent = `여유 ${freeGb.toFixed(1)}GB`;
    diskEl.classList.remove("warning", "danger");
    if (freeGb < status.disk.low_danger_gb) diskEl.classList.add("danger");
    else if (freeGb < status.disk.low_warning_gb) diskEl.classList.add("warning");
  }

  const mapPointsEl = document.getElementById("map-points");
  if (mapPointsEl && status.map) {
    mapPointsEl.textContent = status.map.points > 0 ? `${status.map.points.toLocaleString()}pt` : "";
    mapPointsEl.classList.toggle("hidden", status.map.points === 0);
  }

  document.getElementById("btn-lidar-start").disabled = status.lidar.running;
  document.getElementById("btn-lidar-stop").disabled = !status.lidar.running;

  // The record button swaps for a stop button once recording is live,
  // rather than just disabling both — HUD real estate is tight on a phone.
  const recOpenBtn = document.getElementById("btn-rec-open");
  const recStopBtn = document.getElementById("btn-rec-stop");
  recOpenBtn.classList.toggle("hidden", status.recording.active);
  recStopBtn.classList.toggle("hidden", !status.recording.active);
  recOpenBtn.disabled = !status.lidar.running;

  const fastlioTestState = document.getElementById("fastlio-test-state");
  const fastlioTestStart = document.getElementById("btn-fastlio-test-start");
  const fastlioTestStop = document.getElementById("btn-fastlio-test-stop");
  if (fastlioTestState && status.map) {
    const running = !!(status.process_status && status.process_status.fastlio && status.process_status.fastlio.running);
    fastlioTestState.textContent = running
      ? `● 실행 중 (${status.map.health} · ${status.map.hz.toFixed(1)}Hz · ${status.map.points.toLocaleString()}pt)`
      : "● 정지";
    fastlioTestState.className = "state-line " + (running ? "on" : "off");
    fastlioTestStart.disabled = !status.lidar.running || running;
    // Stopping while a real recording owns fastlio is rejected server-side
    // (409) — disable client-side too so the test button can't fire that.
    fastlioTestStop.disabled = !running || status.recording.active;
  }
}