/* ============================================================
   File: static/js/bookcard_controller.js
   Purpose:
     Single owner for updating book-card DOM from merged state
     (would_merge_to)
   ============================================================ */

console.log("[BOOKCARD] controller loaded");

/* ============================================================
   ENTRY POINT (called by state_updater.js)
   ============================================================ */

function updateBookCardsFromState(stateList) {
  console.log("[BOOKCARD] updateBookCardsFromState called");

  if (!Array.isArray(stateList)) {
    console.warn("[BOOKCARD] Invalid stateList", stateList);
    return;
  }

  const stateById = {};

  stateList.forEach((entry) => {
    const merged = entry.would_merge_to;
    if (!merged || merged.book_idx == null) {
      console.warn("[BOOKCARD] entry without merged/book_idx", entry);
      return;
    }
    stateById[String(merged.book_idx)] = merged;
  });

  document.querySelectorAll(".book-card").forEach((card) => {
    const bookIdx = card.dataset.bookIdx;
    const state = stateById[bookIdx];

    if (!state) {
      console.debug("[BOOKCARD] No state for book_idx", bookIdx);
      return;
    }

    console.log("[BOOKCARD] Updating card", bookIdx, state.status);
    updateSingleBookCard(card, state);
  });
}

/* ============================================================
   SINGLE CARD UPDATE
   ============================================================ */

function updateSingleBookCard(card, state) {
  console.log("[BOOKCARD] updateSingleBookCard", state.book_idx);

  updateStatus(card, state);
  updateButtons(card, state);
  updateProgress(card, state);
}

/* ============================================================
   STATUS
   ============================================================ */

function updateStatus(card, state) {
  console.log("[BOOKCARD][STATUS]", state.book_idx, "→", state.status);
  card.className = `book-card ${state.status || ""}`;
}

/* ============================================================
   BUTTONS
   ============================================================ */

function updateButtons(card, state) {
  const startBtn = card.querySelector(".icon-start");
  const abortBtn = card.querySelector(".icon-abort");

  const busy = ["starting", "downloading", "parsing", "audio"];

  console.log("[BOOKCARD][BUTTONS]", state.book_idx, "status:", state.status);

  if (startBtn) {
    // startBtn.disabled = busy.includes(state.status);
  }

  if (abortBtn) {
    abortBtn.disabled = !busy.includes(state.status);
  }
}

/* ============================================================
   PROGRESS (DOWNLOAD + AUDIO)
   ============================================================ */

function updateProgress(card, s) {
  const total = Number(s.chapters_total || 0);

  // const downloadDone =
  //   Number(s.chapters_download_done || 0) +
  //   Number(s.chapters_download_skipped || 0);
  const downloadDone = Number(s.downloaded || 0);

  const audioDone = Number(s.audio_done || 0) + Number(s.audio_skipped || 0);

  const downloadPct =
    total > 0 ? Math.min((downloadDone / total) * 100, 100) : 0;

  const audioPct = total > 0 ? Math.min((audioDone / total) * 100, 100) : 0;

  console.log("[BOOKCARD][PROGRESS]", s.book_idx, {
    total,
    downloadDone,
    audioDone,
    downloadPct,
    audioPct,
  });

  /* ---- DOWNLOAD ---- */
  const dlBar = card.querySelector('[data-field="download_pct"]');
  const dlText = card.querySelector('[data-field="download_text"]');

  if (dlBar) dlBar.style.width = `${downloadPct}%`;
  if (dlText) dlText.textContent = `${downloadDone} / ${total}`;

  /* ---- AUDIO ---- */
  const auBar = card.querySelector('[data-field="audio_pct"]');
  const auText = card.querySelector('[data-field="audio_text"]');

  if (auBar) auBar.style.width = `${audioPct}%`;
  if (auText) auText.textContent = `${audioDone} / ${total}`;
}