// 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";
    })
    .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);