// lazyflat — live time helpers.
// [data-rel-utc="<iso>"]       → "vor 3 min" (relative-past, updated every 5 s)
// [data-counter-up-utc="<iso>"] → "vor X s" counting up each second (used for
//                                  "aktualisiert vor X s"; resets when the
//                                  server ships a newer timestamp in the swap)

function fmtRelative(iso) {
  const ts = Date.parse(iso);
  if (!iso || Number.isNaN(ts)) return "—";
  const diff = Math.max(0, Math.floor((Date.now() - ts) / 1000));
  if (diff < 5)       return "gerade eben";
  if (diff < 60)      return `vor ${diff} s`;
  if (diff < 3600)    return `vor ${Math.floor(diff / 60)} min`;
  if (diff < 86400)   return `vor ${Math.floor(diff / 3600)} h`;
  return `vor ${Math.floor(diff / 86400)} Tagen`;
}

function fmtCountUp(iso) {
  const ts = Date.parse(iso);
  if (!iso || Number.isNaN(ts)) return "—";
  const diff = Math.max(0, Math.floor((Date.now() - ts) / 1000));
  return `vor ${diff} s`;
}

function updateRelativeTimes() {
  document.querySelectorAll("[data-rel-utc]").forEach((el) => {
    el.textContent = fmtRelative(el.dataset.relUtc);
  });
}

function updateCounterUps() {
  document.querySelectorAll("[data-counter-up-utc]").forEach((el) => {
    el.textContent = fmtCountUp(el.dataset.counterUpUtc);
  });
}

// After the HTMX swap rebuilds the list, the open-chevron class is gone even
// though the corresponding .flat-detail pane is preserved. Re-sync by looking
// at pane visibility.
function syncFlatExpandState() {
  document.querySelectorAll(".flat-detail").forEach((pane) => {
    const row = pane.closest(".flat-row");
    if (!row) return;
    const btn = row.querySelector(".flat-expand-btn");
    if (!btn) return;
    const open = pane.dataset.loaded === "1" && pane.style.display !== "none";
    btn.classList.toggle("open", open);
  });
}

function tick() {
  updateRelativeTimes();
  updateCounterUps();
}

document.addEventListener("DOMContentLoaded", tick);
document.addEventListener("DOMContentLoaded", syncFlatExpandState);
if (document.body) {
  document.body.addEventListener("htmx:afterSwap", tick);
  document.body.addEventListener("htmx:afterSwap", syncFlatExpandState);
}
setInterval(updateCounterUps, 1000);
setInterval(updateRelativeTimes, 5000);

// Flat detail expand — lazily fetches /partials/wohnung/<id> into the sibling
// .flat-detail container on first open, toggles visibility on subsequent clicks.
// Event delegation survives HTMX swaps without re-binding on each poll.
document.addEventListener("click", (ev) => {
  const btn = ev.target.closest(".flat-expand-btn");
  if (!btn) return;
  const row = btn.closest(".flat-row");
  if (!row) return;
  const pane = row.querySelector(".flat-detail");
  if (!pane) return;

  if (btn.classList.contains("open")) {
    pane.style.display = "none";
    btn.classList.remove("open");
    return;
  }
  btn.classList.add("open");
  pane.style.display = "block";
  if (pane.dataset.loaded) return;

  pane.innerHTML = '<div class="px-4 py-5 text-sm text-slate-500">lädt…</div>';
  const flatId = btn.dataset.flatId || "";
  fetch("/partials/wohnung/" + encodeURIComponent(flatId),
        { headers: { "HX-Request": "true" } })
    .then((r) => r.text())
    .then((html) => {
      pane.innerHTML = html;
      pane.dataset.loaded = "1";
      // DEBUG(lightbox): confirm fetched partial actually contains <button class="flat-gallery-tile">
      const tileCount = pane.querySelectorAll(".flat-gallery-tile").length;
      const aTagCount = pane.querySelectorAll("a.flat-gallery-tile").length;
      console.log("[lazyflat.lightbox] partial loaded flat=%s tiles=%d (a-tags=%d, html-snippet=%o)",
                  flatId, tileCount, aTagCount, html.slice(0, 200));
    })
    .catch(() => {
      pane.innerHTML = '<div class="px-4 py-5 text-sm text-slate-500">Detail konnte nicht geladen werden.</div>';
    });
});

// Deep-link landing: ?flat=<id> on first load expands + highlights that row.
// Used from Telegram match notifications so "Zur lazyflat Seite" jumps
// straight to the relevant card.
function openDeepLinkedFlat() {
  const params = new URLSearchParams(location.search);
  const targetId = params.get("flat");
  if (!targetId) return;
  let found = null;
  for (const btn of document.querySelectorAll(".flat-expand-btn")) {
    if (btn.dataset.flatId === targetId) { found = btn; break; }
  }
  if (!found) {
    // Flat not in the visible list (filter/age/rejected). Drop the param so
    // a reload doesn't keep failing silently.
    params.delete("flat");
    const qs = params.toString();
    history.replaceState(null, "", location.pathname + (qs ? "?" + qs : "") + location.hash);
    return;
  }
  const row = found.closest(".flat-row");
  if (!found.classList.contains("open")) found.click();
  if (row) {
    row.scrollIntoView({ behavior: "smooth", block: "center" });
    row.classList.add("flat-highlight");
    setTimeout(() => row.classList.remove("flat-highlight"), 3000);
  }
  params.delete("flat");
  const qs = params.toString();
  history.replaceState(null, "", location.pathname + (qs ? "?" + qs : "") + location.hash);
}

document.addEventListener("DOMContentLoaded", openDeepLinkedFlat);

// Image lightbox — single global modal in base.html, opened by clicking any
// .flat-gallery-tile. Click handler is delegated so it survives HTMX swaps.
// Visibility is driven by inline style.display rather than a `hidden` class
// because Tailwind's CDN injects its own `.hidden { display: none }` rule
// at runtime, which conflicted with our class toggle and kept the modal
// invisible after open().
(function () {
  // DEBUG(lightbox): start-up trace, remove once the viewer is confirmed working.
  console.log("[lazyflat.lightbox] IIFE start");
  const overlay = document.getElementById("lazyflat-lightbox");
  console.log("[lazyflat.lightbox] overlay element:", overlay);
  if (!overlay) {
    console.warn("[lazyflat.lightbox] #lazyflat-lightbox not in DOM; viewer disabled");
    return;
  }
  const imgEl = overlay.querySelector(".lightbox-image");
  const counterEl = overlay.querySelector(".lightbox-counter");
  const prevBtn = overlay.querySelector("[data-lightbox-prev]");
  const nextBtn = overlay.querySelector("[data-lightbox-next]");
  const closeBtn = overlay.querySelector("[data-lightbox-close]");
  console.log("[lazyflat.lightbox] children:",
              { imgEl: !!imgEl, counterEl: !!counterEl, prevBtn: !!prevBtn,
                nextBtn: !!nextBtn, closeBtn: !!closeBtn });
  let urls = [];
  let idx = 0;

  function render() {
    imgEl.src = urls[idx];
    imgEl.alt = `Foto ${idx + 1} von ${urls.length}`;
    counterEl.textContent = urls.length > 1 ? `${idx + 1} / ${urls.length}` : "";
    prevBtn.hidden = idx <= 0;
    nextBtn.hidden = idx >= urls.length - 1;
  }

  function open(list, startIdx) {
    console.log("[lazyflat.lightbox] open() called", { count: list && list.length, startIdx, list });
    if (!list.length) {
      console.warn("[lazyflat.lightbox] open() bailed — empty url list");
      return;
    }
    urls = list;
    idx = Math.max(0, Math.min(startIdx | 0, urls.length - 1));
    overlay.style.display = "flex";
    overlay.setAttribute("aria-hidden", "false");
    document.body.classList.add("lightbox-open");
    render();
    console.log("[lazyflat.lightbox] open() done — overlay computed display:",
                getComputedStyle(overlay).display, "src:", imgEl.src);
  }

  function close() {
    overlay.style.display = "none";
    overlay.setAttribute("aria-hidden", "true");
    document.body.classList.remove("lightbox-open");
    imgEl.removeAttribute("src");
    urls = [];
  }

  function step(delta) {
    const next = idx + delta;
    if (next < 0 || next >= urls.length) return;
    idx = next;
    render();
  }

  prevBtn.addEventListener("click", () => step(-1));
  nextBtn.addEventListener("click", () => step(1));
  closeBtn.addEventListener("click", close);
  overlay.addEventListener("click", (ev) => {
    if (ev.target === overlay) close();
  });
  document.addEventListener("keydown", (ev) => {
    if (overlay.style.display === "none") return;
    if (ev.key === "Escape") close();
    else if (ev.key === "ArrowLeft") step(-1);
    else if (ev.key === "ArrowRight") step(1);
  });

  document.addEventListener("click", (ev) => {
    const tile = ev.target.closest(".flat-gallery-tile");
    if (!tile) {
      // DEBUG(lightbox): only log clicks somewhere INSIDE a gallery so we don't spam.
      if (ev.target.closest && ev.target.closest(".flat-gallery")) {
        console.log("[lazyflat.lightbox] click inside gallery but no .flat-gallery-tile ancestor",
                    { target: ev.target, tagName: ev.target.tagName });
      }
      return;
    }
    console.log("[lazyflat.lightbox] tile clicked", { tile, target: ev.target,
                tagName: tile.tagName, fullSrc: tile.dataset.fullSrc });
    const gallery = tile.closest(".flat-gallery");
    if (!gallery) {
      console.warn("[lazyflat.lightbox] tile has no .flat-gallery ancestor");
      return;
    }
    ev.preventDefault();
    const tiles = Array.from(gallery.querySelectorAll(".flat-gallery-tile"));
    const list = tiles
      .map((t) => t.dataset.fullSrc || (t.querySelector("img") || {}).src || "")
      .filter(Boolean);
    console.log("[lazyflat.lightbox] gallery has", tiles.length, "tiles,", list.length, "valid urls");
    open(list, tiles.indexOf(tile));
  });
  console.log("[lazyflat.lightbox] click delegate attached");
})();

// DEBUG(lightbox): catch any uncaught error so we know if app.js stopped
// running before the IIFE attached its handlers.
window.addEventListener("error", (ev) => {
  console.error("[lazyflat.lightbox] window error:", ev.message, ev.filename + ":" + ev.lineno);
});