import { formatBytes, formatDuration } from "/js/format.js";

async function getJSON(url, opts) {
  const res = await fetch(url, opts);
  if (!res.ok) throw new Error(`${url}: ${res.status} ${await res.text()}`);
  return res.json();
}

export function initRecordingPanel(defaultSaveDir) {
  const saveDirInput = document.getElementById("rec-save-dir");
  saveDirInput.value = defaultSaveDir;

  const browseBtn = document.getElementById("btn-browse");
  const browsePanel = document.getElementById("browse-panel");
  const filenameInput = document.getElementById("rec-filename");
  const confirmBtn = document.getElementById("btn-rec-confirm");
  const stopBtn = document.getElementById("btn-rec-stop");
  const bagList = document.getElementById("bag-list");

  browseBtn.onclick = async () => {
    if (!browsePanel.classList.contains("hidden")) {
      browsePanel.classList.add("hidden");
      return;
    }
    await renderBrowse(saveDirInput.value || defaultSaveDir);
    browsePanel.classList.remove("hidden");
  };

  async function renderBrowse(path) {
    const data = await getJSON(`/api/fs/browse?path=${encodeURIComponent(path)}`);
    browsePanel.innerHTML = "";
    const cur = document.createElement("div");
    cur.className = "dir-entry";
    cur.style.fontWeight = "bold";
    cur.textContent = `✓ 선택: ${data.path}`;
    cur.onclick = () => {
      saveDirInput.value = data.path;
      browsePanel.classList.add("hidden");
      refreshBags();
    };
    browsePanel.appendChild(cur);
    if (data.parent) {
      const up = document.createElement("div");
      up.className = "dir-entry";
      up.textContent = "..";
      up.onclick = () => renderBrowse(data.parent);
      browsePanel.appendChild(up);
    }
    for (const d of data.dirs) {
      const el = document.createElement("div");
      el.className = "dir-entry";
      el.textContent = d.name;
      el.onclick = () => renderBrowse(d.path);
      browsePanel.appendChild(el);
    }
  }

  saveDirInput.addEventListener("change", refreshBags);

  confirmBtn.onclick = async () => {
    try {
      await getJSON("/api/recording/start", {
        method: "POST", headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ filename: filenameInput.value, save_dir: saveDirInput.value }),
      });
      refreshBags();
      document.getElementById("overlay-recording").classList.add("hidden");
    } catch (e) {
      alert(String(e));
    }
  };

  stopBtn.onclick = async () => {
    await getJSON("/api/recording/stop", { method: "POST" });
    // rosbag2 flushes metadata.yaml on SIGINT — give it a moment before
    // reading the bag back, otherwise it still shows as "incomplete".
    setTimeout(refreshBags, 1200);
  };

  function renderBagItem(bag) {
    const li = document.createElement("li");
    li.className = "bag-item";

    const nameRow = document.createElement("div");
    nameRow.className = "bag-item-name";
    nameRow.textContent = bag.name;
    if (!bag.complete) {
      const badge = document.createElement("span");
      badge.className = "bag-item-incomplete";
      badge.textContent = "(녹화 중 / 미완료)";
      nameRow.appendChild(badge);
    }
    li.appendChild(nameRow);

    const meta = document.createElement("div");
    meta.className = "bag-item-meta";
    const parts = [formatDuration(bag.duration_s), formatBytes(bag.size_bytes)];
    if (bag.message_count != null) parts.push(`msg ${bag.message_count.toLocaleString()}`);
    if (bag.topics && bag.topics.length) parts.push(`topic ${bag.topics.length}개`);
    meta.textContent = parts.filter(Boolean).join(" · ");
    li.appendChild(meta);

    return li;
  }

  // Disk-free is owned entirely by status-panel.js now (HUD strip, driven by
  // /ws/status) — this panel only needs the bag list.
  async function refreshBags() {
    const dir = saveDirInput.value || defaultSaveDir;
    try {
      const bagsData = await getJSON(`/api/bags?save_dir=${encodeURIComponent(dir)}`);
      bagList.innerHTML = "";
      for (const bag of bagsData.bags) {
        bagList.appendChild(renderBagItem(bag));
      }
    } catch (e) {
      // Directory may not exist yet (new save path) — not an error worth alarming over.
      bagList.innerHTML = "";
    }
  }
  refreshBags();
  setInterval(refreshBags, 15000);
}