(() => {
  "use strict";

  const MOODS = ["😎", "🔥", "💀", "😭", "🥲", "✨", "😤", "🖤", "🫠", "👾"];
  const MAX_BADGES = 5;

  // ---------------- tabs ----------------
  const tabForm = document.getElementById("tab-form");
  const tabGallery = document.getElementById("tab-gallery");
  const panelForm = document.getElementById("panel-form");
  const panelGallery = document.getElementById("panel-gallery");

  function showPanel(which) {
    const showForm = which === "form";
    panelForm.classList.toggle("is-hidden", !showForm);
    panelGallery.classList.toggle("is-hidden", showForm);
    tabForm.classList.toggle("is-active", showForm);
    tabGallery.classList.toggle("is-active", !showForm);
    tabForm.setAttribute("aria-selected", String(showForm));
    tabGallery.setAttribute("aria-selected", String(!showForm));
    if (!showForm) loadEntries();
  }

  tabForm.addEventListener("click", () => showPanel("form"));
  tabGallery.addEventListener("click", () => showPanel("gallery"));

  // ---------------- mood picker ----------------
  const moodPicker = document.querySelector(".mood-picker");
  const moodInput = document.getElementById("mood");

  MOODS.forEach((emoji, i) => {
    const btn = document.createElement("button");
    btn.type = "button";
    btn.className = "mood-btn";
    btn.textContent = emoji;
    btn.setAttribute("role", "radio");
    btn.setAttribute("aria-pressed", i === MOODS.length - 1 ? "true" : "false"); // default last = 🖤
    btn.setAttribute("aria-label", `Mood: ${emoji}`);
    btn.addEventListener("click", () => {
      moodPicker.querySelectorAll(".mood-btn").forEach((b) => b.setAttribute("aria-pressed", "false"));
      btn.setAttribute("aria-pressed", "true");
      moodInput.value = emoji;
    });
    moodPicker.appendChild(btn);
  });
  moodInput.value = MOODS[MOODS.length - 1];

  // ---------------- badge preview ----------------
  const badgeInput = document.getElementById("badges");
  const badgePreview = document.getElementById("badge-preview");
  const formError = document.getElementById("form-error");
  const formSuccess = document.getElementById("form-success");

  badgeInput.addEventListener("change", () => {
    badgePreview.innerHTML = "";
    const files = Array.from(badgeInput.files || []);

    if (files.length > MAX_BADGES) {
      showError(`Please choose at most ${MAX_BADGES} images.`);
      badgeInput.value = "";
      return;
    }
    clearError();

    files.forEach((file) => {
      const url = URL.createObjectURL(file);
      const img = document.createElement("img");
      img.src = url;
      img.alt = file.name;
      img.onload = () => URL.revokeObjectURL(url);
      badgePreview.appendChild(img);
    });
  });

  function showError(msg) {
    clearSuccess();
    formError.textContent = msg;
    formError.hidden = false;
  }
  function clearError() {
    formError.hidden = true;
    formError.textContent = "";
  }
  function showSuccess(msg) {
    clearError();
    formSuccess.textContent = msg;
    formSuccess.hidden = false;
  }
  function clearSuccess() {
    formSuccess.hidden = true;
    formSuccess.textContent = "";
  }

  // ---------------- form submit ----------------
  const form = document.getElementById("entry-form");
  const submitBtn = document.getElementById("submit-btn");

  form.addEventListener("submit", async (e) => {
    e.preventDefault();
    clearError();
    clearSuccess();

    const name = document.getElementById("name").value.trim();
    if (!name) {
      showError("Your Name is required.");
      document.getElementById("name").focus();
      return;
    }

    const formData = new FormData(form);

    submitBtn.disabled = true;
    submitBtn.querySelector("span").textContent = "ADDING...";

    try {
      const res = await fetch("/api/entries", { method: "POST", body: formData });
      const data = await res.json().catch(() => ({}));

      if (!res.ok) {
        throw new Error(data.error || "Something went wrong submitting your page.");
      }

      form.reset();
      badgePreview.innerHTML = "";
      moodPicker.querySelectorAll(".mood-btn").forEach((b, i) =>
        b.setAttribute("aria-pressed", i === MOODS.length - 1 ? "true" : "false")
      );
      moodInput.value = MOODS[MOODS.length - 1];

      showSuccess("Thanks! Your page has been submitted and is waiting for approval — check back on \u201cEveryone's pages\u201d soon 💌");
    } catch (err) {
      showError(err.message);
    } finally {
      submitBtn.disabled = false;
      submitBtn.querySelector("span").textContent = "ADD MY PAGE";
    }
  });

  // ---------------- gallery ----------------
  const galleryGrid = document.getElementById("gallery-grid");
  const galleryStatus = document.getElementById("gallery-status");

  function escapeHtml(str) {
    const div = document.createElement("div");
    div.textContent = str == null ? "" : String(str);
    return div.innerHTML;
  }

  function ordinal(n) {
    const s = ["th", "st", "nd", "rd"];
    const v = n % 100;
    return n + (s[(v - 20) % 10] || s[v] || s[0]);
  }

  function formatDate(ts) {
    const d = new Date(ts);
    const months = [
      "January", "February", "March", "April", "May", "June",
      "July", "August", "September", "October", "November", "December",
    ];
    return `${ordinal(d.getDate())} ${months[d.getMonth()]} ${d.getFullYear()}`;
  }

  function renderRow(label, value) {
    if (!value) return "";
    return `<div class="entry-card__row"><span class="k">${escapeHtml(label)}</span><span class="v">${escapeHtml(value)}</span></div>`;
  }

  function renderCard(entry) {
    const card = document.createElement("article");
    card.className = "entry-card";

    const badgesHtml = (entry.badges || [])
      .map((src) => `<img src="${escapeHtml(src)}" alt="badge" loading="lazy" />`)
      .join("");

    card.innerHTML = `
      <span class="entry-card__mood" aria-hidden="true">${escapeHtml(entry.mood || "🖤")}</span>
      <h3 class="entry-card__name">${escapeHtml(entry.name)}</h3>
      ${renderRow("Fun fact", entry.funFact)}
      ${renderRow("Favourite colour", entry.favColor)}
      ${renderRow("Favourite music genre", entry.favGenre)}
      ${renderRow("Favourite agent", entry.petPeeves)}
      ${renderRow("On Valo", entry.merzHate)}
      ${renderRow("IGN", entry.socialLink)}
      ${badgesHtml ? `<div class="entry-card__badges">${badgesHtml}</div>` : ""}
      <div class="entry-card__time">${escapeHtml(formatDate(entry.createdAt))}</div>
    `;
    return card;
  }

  async function loadEntries() {
    galleryStatus.textContent = "flipping through pages...";
    galleryGrid.innerHTML = "";
    try {
      const res = await fetch("/api/entries");
      if (!res.ok) throw new Error("Could not load pages.");
      const entries = await res.json();

      if (!entries.length) {
        galleryStatus.textContent = "no pages yet — be the first to sign the book!";
        return;
      }

      galleryStatus.textContent = `${entries.length} page${entries.length === 1 ? "" : "s"} taped in so far`;
      entries.forEach((entry) => galleryGrid.appendChild(renderCard(entry)));
    } catch (err) {
      galleryStatus.textContent = "hmm, couldn't load the pages. is the server running?";
    }
  }

  // initial load in the background so the gallery is ready when switched to
  loadEntries();
})();