// Title search runs entirely in the browser: the full list is already in the
// DOM, so filtering it needs no request.
(function () {
  function applyFilter() {
    var box = document.getElementById("search");
    if (!box) return;
    var query = box.value.trim();
    var needle = query.toLowerCase();
    var cards = document.querySelectorAll(".card");
    var visible = 0;
    cards.forEach(function (card) {
      var title = (card.dataset.title || "").toLowerCase();
      card.hidden = needle !== "" && title.indexOf(needle) === -1;
      if (!card.hidden) visible++;
    });

    // The strip is never filtered, so leaving it up during a search puts
    // non-matching covers above an empty list and the screen contradicts
    // itself.
    var recent = document.querySelector(".recent");
    if (recent) recent.hidden = needle !== "";

    // An empty bucket already explains itself server-side; this only speaks
    // when the filter is what emptied the screen.
    var none = document.getElementById("no-match");
    if (none) {
      none.hidden = !(needle !== "" && cards.length > 0 && visible === 0);
      if (!none.hidden) none.querySelector(".no-match-q").textContent = query;
    }
  }

  document.addEventListener("input", function (e) {
    if (e.target && e.target.id === "search") applyFilter();
  });

  document.addEventListener("click", function (e) {
    if (!e.target || !e.target.classList.contains("clear-search")) return;
    var box = document.getElementById("search");
    box.value = "";
    applyFilter();
    box.focus();
  });

  // htmx replaces the list on a tab switch, so re-apply to the new cards.
  document.body.addEventListener("htmx:afterSwap", applyFilter);
})();

function setActiveTab(el) {
  el.parentElement.querySelectorAll("a").forEach(function (t) {
    var on = t === el;
    t.classList.toggle("active", on);
    if (on) t.setAttribute("aria-current", "page");
    else t.removeAttribute("aria-current");
  });
}

// The chapter-edit form and the archive/finish/remove confirm rows are the
// per-card disclosure panels; only one makes sense open at a time. The button
// that owns an open panel carries .open, which is how the strip shows which
// cell the panel belongs to.
function closeCardPanels(key) {
  var card = document.getElementById("card-" + key);
  if (!card) return;
  card.querySelectorAll(".chapter-form, .confirm-row").forEach(function (p) {
    p.hidden = true;
  });
  card.querySelectorAll(".actions .open").forEach(function (b) {
    b.classList.remove("open");
    b.setAttribute("aria-expanded", "false");
  });
}

function togglePanel(key, panelId, buttonSelector) {
  var panel = document.getElementById(panelId);
  if (!panel) return null;
  var opening = panel.hidden;
  closeCardPanels(key);
  panel.hidden = !opening;
  var card = document.getElementById("card-" + key);
  var button = card && card.querySelector(buttonSelector);
  if (button) {
    button.classList.toggle("open", opening);
    button.setAttribute("aria-expanded", opening ? "true" : "false");
  }
  return panel;
}

function toggleChapterForm(key) {
  var form = togglePanel(key, "chapter-form-" + key, ".actions .pencil");
  if (form && !form.hidden) form.querySelector("input").focus();
}

// kind is "archive" | "finish" | "remove" — the panel id and the owning action
// cell share it.
function toggleConfirmRow(key, kind) {
  var cls = { archive: ".box", finish: ".finish", remove: ".remove" }[kind];
  togglePanel(key, "confirm-" + kind + "-" + key, ".actions " + cls);
}

// A failed favourite/chapter/delete request leaves the card in place (htmx
// does not swap on a non-2xx response) but otherwise gives no sign anything
// went wrong. Surface it inline instead of leaving the tap looking ignored.
(function () {
  function showError(elt, message, linkHref, linkText) {
    var card = elt.closest(".card");
    var slot = card && card.querySelector(".error-inline");
    if (!slot) return;
    slot.textContent = message;
    if (linkHref) {
      var a = document.createElement("a");
      a.href = linkHref;
      a.textContent = linkText;
      a.className = "error-link";
      slot.append(" ", a);
    }
    slot.hidden = false;
    clearTimeout(slot._hideTimer);
    slot._hideTimer = setTimeout(function () {
      slot.hidden = true;
    }, linkHref ? 30000 : 5000);
  }

  // The handlers answer a bad value with http.Error, i.e. a short plain-text
  // line — worth showing verbatim. Anything long or HTML-ish is an error page,
  // not a reason, so fall back to the generic copy.
  function reasonFrom(xhr) {
    var body = (xhr.responseText || "").trim();
    if (!body || body.length > 120 || body.indexOf("<") === 0) return "";
    return body.charAt(0).toUpperCase() + body.slice(1);
  }

  document.body.addEventListener("htmx:responseError", function (e) {
    var xhr = e.detail.xhr;
    if (xhr.status === 401) {
      showError(e.detail.elt, "Session expired — nothing was saved.", "/login", "Log in again");
      return;
    }
    if (xhr.status === 400) {
      var reason = reasonFrom(xhr);
      showError(e.detail.elt, reason ? reason + "." : "That value wasn't accepted — check it and try again.");
      return;
    }
    showError(e.detail.elt, "Couldn't save — try again.");
  });
  document.body.addEventListener("htmx:sendError", function (e) {
    showError(e.detail.elt, "No connection — try again.");
  });
})();