/* ── VOX ANI TTS — Frontend Logic ── */

// ─── Helpers ────────────────────────────────────────────────
function apiKey() {
  return document.getElementById("api-key").value.trim();
}

function setStatus(id, msg, type = "") {
  const el = document.getElementById(id);
  el.textContent = msg;
  el.className = "status" + (type ? " " + type : "");
}

function setLoading(btnId, loading, label) {
  const btn = document.getElementById(btnId);
  btn.disabled = loading;
  btn.innerHTML = loading
    ? `<span class="spin">⟳</span> ${label}`
    : btn.dataset.label;
}

function initBtn(btnId, label) {
  const btn = document.getElementById(btnId);
  btn.dataset.label = label;
}

// ─── Tabs ───────────────────────────────────────────────────
function showTab(name) {
  document.querySelectorAll(".tab-panel").forEach((p) => p.classList.remove("active"));
  document.querySelectorAll(".tab-btn").forEach((b) => b.classList.remove("active"));
  document.getElementById("tab-" + name).classList.add("active");
  const map = { synth: 0, clone: 1, manage: 2, encode: 3 };
  document.querySelectorAll(".tab-btn")[map[name]].classList.add("active");
}

// ─── Load voices ─────────────────────────────────────────────
async function loadVoices() {
  const key = apiKey();
  if (!key) return;
  try {
    const res = await fetch(`/voices?api_key=${encodeURIComponent(key)}`);
    if (!res.ok) { clearVoiceDropdowns(); return; }
    const data = await res.json();
    const voices = data.voices || [];
    populateDropdown("voice-select", voices, true);
    const cloned = voices.filter((v) => v.type === "cloned");
    populateDropdown("dl-voice", cloned, false);
    populateDropdown("del-voice", cloned, false);
    renderVoiceList(cloned);
  } catch {
    clearVoiceDropdowns();
  }
}

function populateDropdown(id, voices, includeAll) {
  const el = document.getElementById(id);
  el.innerHTML = includeAll
    ? voices.map((v) => `<option value="${v.id}">${v.name}</option>`).join("")
    : `<option value="">— избери —</option>` +
      voices.map((v) => `<option value="${v.id}">${v.name} (${v.id})</option>`).join("");
}

function clearVoiceDropdowns() {
  ["voice-select", "dl-voice", "del-voice"].forEach((id) => {
    document.getElementById(id).innerHTML = `<option value="">— невалиден ключ —</option>`;
  });
  ["voices-list", "manage-list"].forEach((id) => {
    document.getElementById(id).textContent = "🔐 Въведи валиден API ключ";
  });
}

function renderVoiceList(cloned) {
  const text = cloned.length
    ? cloned.map((v) => `• ${v.name}  (ID: ${v.id})`).join("\n")
    : "Няма запазени гласове";
  document.getElementById("voices-list").textContent = text;
  document.getElementById("manage-list").textContent = text;
}

function onKeyChange() {
  clearTimeout(window._keyTimer);
  window._keyTimer = setTimeout(loadVoices, 500);
}

// ─── Enhance toggle ──────────────────────────────────────────
function toggleEnhance() {
  const on = document.getElementById("do-enhance").checked;
  document.getElementById("enhance-sliders").style.opacity = on ? "1" : "0.4";
  document.getElementById("enhance-sliders").style.pointerEvents = on ? "" : "none";
}

// ─── Synthesize ──────────────────────────────────────────────
async function synthesize() {
  const key   = apiKey();
  const text  = document.getElementById("synth-text").value.trim();
  const voice = document.getElementById("voice-select").value;
  const refFile = document.getElementById("ref-audio-synth").files[0];

  if (!key)   return setStatus("synth-status", "⚠️ Въведи API ключ", "warn");
  if (!text)  return setStatus("synth-status", "⚠️ Въведи текст", "warn");

  setStatus("synth-status", "⟳ Генериране…");
  document.getElementById("synth-btn").disabled = true;

  try {
    let url;

    if (refFile) {
      // Encode reference audio → embedding → synthesize with embedding
      setStatus("synth-status", "⟳ Encode на reference аудио…");
      const form = new FormData();
      form.append("file", refFile);
      const encRes = await fetch(
        `/encode_voice?api_key=${encodeURIComponent(key)}&enhance=false`,
        { method: "POST", body: form }
      );
      if (!encRes.ok) throw new Error(await encRes.text());
      const { embedding } = await encRes.json();
      setStatus("synth-status", "⟳ Синтез…");
      url =
        `/synthesize_with_embedding?api_key=${encodeURIComponent(key)}` +
        `&text=${encodeURIComponent(text)}` +
        `&embedding=${encodeURIComponent(JSON.stringify(embedding))}`;
    } else {
      if (!voice) return setStatus("synth-status", "⚠️ Избери глас", "warn");
      url =
        `/synthesize?api_key=${encodeURIComponent(key)}` +
        `&text=${encodeURIComponent(text)}` +
        `&voice=${encodeURIComponent(voice)}`;
    }

    const res = await fetch(url);
    if (!res.ok) throw new Error(await res.text());
    const blob = await res.blob();
    const audioEl = document.getElementById("synth-audio");
    audioEl.src = URL.createObjectURL(blob);
    audioEl.style.display = "block";
    audioEl.play();
    setStatus("synth-status", "✅ Готово", "ok");
  } catch (e) {
    setStatus("synth-status", "❌ Грешка: " + e.message, "err");
  } finally {
    document.getElementById("synth-btn").disabled = false;
  }
}

// ─── Clone voice ─────────────────────────────────────────────
async function cloneVoice() {
  const key      = apiKey();
  const name     = document.getElementById("voice-name").value.trim();
  const fileEl   = document.getElementById("ref-audio-clone");
  const file     = fileEl.files[0];
  const enhance  = document.getElementById("do-enhance").checked;
  const denoise  = document.getElementById("denoise").value;
  const deess    = document.getElementById("deess").value;
  const warm     = document.getElementById("warm").value;

  if (!key)  return setStatus("clone-status", "⚠️ Въведи API ключ", "warn");
  if (!file) return setStatus("clone-status", "⚠️ Качи аудио файл", "warn");

  setStatus("clone-status", "⟳ Клониране…");
  document.getElementById("clone-btn").disabled = true;

  try {
    const form = new FormData();
    form.append("file", file);

    const params = new URLSearchParams({
      api_key: key,
      name:    name || "",
      enhance: enhance,
      denoise_strength: denoise,
      deess_db: deess,
      warm_db:  warm,
    });

    const res = await fetch(`/clone_voice?${params}`, {
      method: "POST",
      body: form,
    });
    if (!res.ok) throw new Error(await res.text());
    const data = await res.json();
    setStatus("clone-status", `✅ Гласът '${data.name}' е запазен!`, "ok");
    fileEl.value = "";
    document.getElementById("voice-name").value = "";
    await loadVoices();
  } catch (e) {
    setStatus("clone-status", "❌ Грешка: " + e.message, "err");
  } finally {
    document.getElementById("clone-btn").disabled = false;
  }
}

// ─── Download voice ──────────────────────────────────────────
async function downloadVoice() {
  const key     = apiKey();
  const voiceId = document.getElementById("dl-voice").value;
  if (!key)     return setStatus("dl-status", "⚠️ Въведи API ключ", "warn");
  if (!voiceId) return setStatus("dl-status", "⚠️ Избери глас", "warn");

  setStatus("dl-status", "⟳ Изтегляне…");
  try {
    const res = await fetch(
      `/voices/${encodeURIComponent(voiceId)}/download?api_key=${encodeURIComponent(key)}`
    );
    if (!res.ok) throw new Error(await res.text());
    const blob = await res.blob();
    const cd   = res.headers.get("content-disposition") || "";
    const match = cd.match(/filename="?([^"]+)"?/);
    const fname = match ? match[1] : `voice_${voiceId}.json`;
    const a = document.createElement("a");
    a.href = URL.createObjectURL(blob);
    a.download = fname;
    a.click();
    setStatus("dl-status", `✅ ${fname} изтеглен`, "ok");
  } catch (e) {
    setStatus("dl-status", "❌ Грешка: " + e.message, "err");
  }
}

// ─── Delete voice ────────────────────────────────────────────
async function deleteVoice() {
  const key     = apiKey();
  const voiceId = document.getElementById("del-voice").value;
  if (!key)     return setStatus("del-status", "⚠️ Въведи API ключ", "warn");
  if (!voiceId) return setStatus("del-status", "⚠️ Избери глас", "warn");

  if (!confirm("Сигурен ли си, че искаш да изтриеш този глас?")) return;

  setStatus("del-status", "⟳ Изтриване…");
  document.getElementById("del-btn").disabled = true;
  try {
    const res = await fetch(
      `/voices/${encodeURIComponent(voiceId)}?api_key=${encodeURIComponent(key)}`,
      { method: "DELETE" }
    );
    if (!res.ok) throw new Error(await res.text());
    const data = await res.json();
    setStatus("del-status", `✅ '${data.name}' е изтрит`, "ok");
    await loadVoices();
  } catch (e) {
    setStatus("del-status", "❌ Грешка: " + e.message, "err");
  } finally {
    document.getElementById("del-btn").disabled = false;
  }
}

// ─── Encode / Decode API Key ────────────────────────────────
function encodeKey() {
  const key = document.getElementById("raw-key").value.trim();
  if (!key) return;
  const encoded = btoa(key).split("").reverse().join("");
  document.getElementById("encoded-out").value = encoded;
}

function decodeKey() {
  const encoded = document.getElementById("encoded-key").value.trim();
  if (!encoded) return;
  try {
    const decoded = atob(encoded.split("").reverse().join(""));
    document.getElementById("decoded-out").value = decoded;
  } catch {
    document.getElementById("decoded-out").value = "❌ Невалиден ключ";
  }
}

// ─── Init ────────────────────────────────────────────────────
document.addEventListener("DOMContentLoaded", () => {
  toggleEnhance();

  // Keyboard shortcut: Ctrl+Enter to synthesize
  document.getElementById("synth-text").addEventListener("keydown", (e) => {
    if ((e.ctrlKey || e.metaKey) && e.key === "Enter") synthesize();
  });

  // If there's already a key on load (browser autofill), fetch voices
  if (apiKey()) loadVoices();
});