const $ = (id) => document.getElementById(id);

const els = {
  text: $("text"),
  charCount: $("charCount"),
  language: $("language"),
  speaker: $("speaker"),
  speed: $("speed"),
  speedVal: $("speedVal"),
  pitch: $("pitch"),
  pitchVal: $("pitchVal"),
  generate: $("generate"),
  btnText: document.querySelector(".btn-text"),
  spinner: document.querySelector(".spinner"),
  result: $("result"),
  audio: $("audio"),
  download: $("download"),
  error: $("error"),
  deviceChip: $("deviceChip"),
};

let voices = [];
let lastUrl = null;

function updateCharCount() {
  els.charCount.textContent = els.text.value.length;
}

function populateSpeakers() {
  const code = els.language.value;
  const lang = voices.find((v) => v.code === code);
  els.speaker.innerHTML = "";
  if (!lang) return;
  lang.speakers.forEach((s) => {
    const opt = document.createElement("option");
    opt.value = s.id;
    opt.textContent = s.label;
    els.speaker.appendChild(opt);
  });
}

async function loadVoices() {
  try {
    const res = await fetch("/api/voices");
    const data = await res.json();
    voices = data.languages || [];
    els.language.innerHTML = "";
    voices.forEach((v) => {
      const opt = document.createElement("option");
      opt.value = v.code;
      opt.textContent = v.label;
      els.language.appendChild(opt);
    });
    populateSpeakers();
  } catch (e) {
    showError("목소리 목록을 불러오지 못했습니다.");
  }
}

async function loadHealth() {
  try {
    const res = await fetch("/api/health");
    const d = await res.json();
    if (d.cuda) {
      els.deviceChip.textContent = `GPU 가속: ${d.gpu}`;
      els.deviceChip.classList.add("gpu");
    } else {
      els.deviceChip.textContent = "CPU 모드로 동작 중";
    }
  } catch (e) {
    els.deviceChip.textContent = "";
  }
}

function showError(msg) {
  els.error.textContent = msg;
  els.error.hidden = false;
}
function clearError() {
  els.error.hidden = true;
}

function setLoading(on) {
  els.generate.disabled = on;
  els.spinner.hidden = !on;
  els.btnText.textContent = on ? "생성 중…" : "음성 생성";
}

async function generate() {
  clearError();
  const text = els.text.value.trim();
  if (!text) {
    showError("읽을 내용을 입력해 주세요.");
    return;
  }
  setLoading(true);
  try {
    const res = await fetch("/api/tts", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        text,
        language: els.language.value,
        speaker: els.speaker.value,
        speed: parseFloat(els.speed.value),
        pitch: parseFloat(els.pitch.value),
      }),
    });
    if (!res.ok) {
      let detail = "음성 생성에 실패했습니다.";
      try {
        const err = await res.json();
        if (err.detail) detail = err.detail;
      } catch (_) {}
      throw new Error(detail);
    }
    const blob = await res.blob();
    if (lastUrl) URL.revokeObjectURL(lastUrl);
    lastUrl = URL.createObjectURL(blob);
    els.audio.src = lastUrl;
    els.download.href = lastUrl;
    els.result.hidden = false;
    els.audio.play().catch(() => {});
  } catch (e) {
    showError(e.message || "오류가 발생했습니다.");
  } finally {
    setLoading(false);
  }
}

els.text.addEventListener("input", updateCharCount);
els.language.addEventListener("change", populateSpeakers);
els.speed.addEventListener("input", () => {
  els.speedVal.textContent = parseFloat(els.speed.value).toFixed(2) + "x";
});
els.pitch.addEventListener("input", () => {
  const v = parseInt(els.pitch.value, 10);
  els.pitchVal.textContent = (v > 0 ? "+" + v : v) + " 반음";
});
els.generate.addEventListener("click", generate);

updateCharCount();
loadVoices();
loadHealth();