// app.js — HarmoSplit フロントエンドロジック（Stripe 認証対応）

const dropZone    = document.getElementById('dropZone');
const fileInput   = document.getElementById('fileInput');
const startBtn    = document.getElementById('startBtn');
const instVol     = document.getElementById('instVol');
const instVolLabel= document.getElementById('instVolLabel');
const modelSelect = document.getElementById('modelSelect');
const useMdx      = document.getElementById('useMdx');

const uploadSection  = document.getElementById('uploadSection');
const progressSection= document.getElementById('progressSection');
const resultSection  = document.getElementById('resultSection');
const errorSection   = document.getElementById('errorSection');

const progressBar  = document.getElementById('progressBar');
const progressPct  = document.getElementById('progressPct');
const progressFile = document.getElementById('progressFile');
const logBox       = document.getElementById('logBox');
const downloadBtn  = document.getElementById('downloadBtn');
const errorMsg     = document.getElementById('errorMsg');

let selectedFile = null;
let verifiedToken = '';

// ── 起動時: Stripe 有効かどうか確認 ────────────────────────
async function initAuth() {
  try {
    const res  = await fetch('/auth-mode');
    const data = await res.json();
    if (!data.free_mode) {
      // 有料モード: トークンエリアを表示
      document.getElementById('tokenArea').style.display = 'block';
      // ローカルストレージに保存済みトークンがあれば復元
      const saved = localStorage.getItem('hmsplit_token');
      if (saved) {
        document.getElementById('tokenInput').value = saved;
        await verifyToken(saved, false);
      }
    } else {
      // 無料モード: トークン不要
      verifiedToken = 'FREE';
    }
  } catch (e) {
    verifiedToken = 'FREE'; // エラー時は無料扱い
  }
}

// ── トークン検証 ─────────────────────────────────────────────
async function verifyToken(token, showAlert = true) {
  try {
    const res  = await fetch('/verify-token', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ token }),
    });
    const data = await res.json();
    if (data.valid) {
      verifiedToken = token;
      localStorage.setItem('hmsplit_token', token);
      document.getElementById('tokenOk').classList.remove('hidden');
      document.getElementById('tokenInput').style.borderColor = 'var(--success)';
    } else {
      verifiedToken = '';
      localStorage.removeItem('hmsplit_token');
      document.getElementById('tokenOk').classList.add('hidden');
      document.getElementById('tokenInput').style.borderColor = 'var(--error)';
      if (showAlert) alert('トークンが無効です。料金ページから登録してください。');
    }
    return data.valid;
  } catch {
    return false;
  }
}

document.getElementById('verifyBtn')?.addEventListener('click', async () => {
  const token = document.getElementById('tokenInput').value.trim();
  if (!token) { alert('トークンを入力してください'); return; }
  await verifyToken(token, true);
});

// ── ファイル選択 ──────────────────────────────────────────────
function selectFile(file) {
  selectedFile = file;
  dropZone.classList.add('has-file');
  dropZone.querySelector('.drop-icon').textContent = fileIsVideo(file.name) ? '🎬' : '🎵';
  const sub = dropZone.querySelector('.drop-sub');
  sub.textContent = file.name;
  sub.classList.add('drop-filename');
  updateStartBtn();
}

function fileIsVideo(name) {
  return /\.(mp4|mov|avi|mkv|m4v|flv|webm|ts)$/i.test(name);
}

function updateStartBtn() {
  const hasFile  = !!selectedFile;
  const hasToken = !!verifiedToken;
  startBtn.disabled = !(hasFile && hasToken);
}

dropZone.addEventListener('dragover', e => { e.preventDefault(); dropZone.classList.add('dragover'); });
dropZone.addEventListener('dragleave', () => dropZone.classList.remove('dragover'));
dropZone.addEventListener('drop', e => {
  e.preventDefault(); dropZone.classList.remove('dragover');
  if (e.dataTransfer.files.length) selectFile(e.dataTransfer.files[0]);
});
dropZone.addEventListener('click', () => fileInput.click());
fileInput.addEventListener('change', () => { if (fileInput.files.length) selectFile(fileInput.files[0]); });

instVol.addEventListener('input', () => {
  instVolLabel.textContent = Math.round(instVol.value * 100) + '%';
});

// ── 処理開始 ──────────────────────────────────────────────────
startBtn.addEventListener('click', async () => {
  if (!selectedFile || !verifiedToken) return;

  uploadSection.classList.add('hidden');
  progressSection.classList.remove('hidden');
  logBox.innerHTML = '';
  progressBar.style.width = '0%';
  progressPct.textContent = '0%';
  progressFile.textContent = selectedFile.name;

  const fd = new FormData();
  fd.append('file', selectedFile);
  fd.append('inst_vol', instVol.value);
  fd.append('model', modelSelect.value);
  fd.append('use_mdx', useMdx.checked ? 'true' : 'false');
  fd.append('token', verifiedToken === 'FREE' ? '' : verifiedToken);

  let jobId;
  try {
    const res  = await fetch('/upload', { method: 'POST', body: fd });
    const data = await res.json();
    if (!res.ok || data.error) throw new Error(data.error || 'アップロード失敗');
    jobId = data.job_id;
  } catch (e) {
    showError(e.message); return;
  }

  const sse = new EventSource(`/progress/${jobId}`);
  sse.addEventListener('message', e => {
    let payload;
    try { payload = JSON.parse(e.data); } catch { return; }
    if (payload.status) {
      sse.close();
      if (payload.status === 'done') showResult(jobId);
      else showError('処理中にエラーが発生しました。ログを確認してください。');
      return;
    }
    if (payload.msg) {
      const p = document.createElement('p');
      p.textContent = payload.msg;
      if (payload.msg.includes('✅') || payload.msg.includes('完了')) p.classList.add('ok');
      if (payload.msg.includes('❌')) p.classList.add('err');
      logBox.appendChild(p);
      logBox.scrollTop = logBox.scrollHeight;
    }
    if (payload.pct !== undefined) {
      progressBar.style.width = payload.pct + '%';
      progressPct.textContent  = payload.pct + '%';
    }
  });

  sse.onerror = () => {
    sse.close();
    setTimeout(async () => {
      try {
        const res  = await fetch(`/status/${jobId}`);
        const data = await res.json();
        if (data.status === 'done') showResult(jobId);
        else showError(data.error || '接続エラー');
      } catch { showError('サーバーとの接続が切れました'); }
    }, 500);
  };
});

function showResult(jobId) {
  progressSection.classList.add('hidden');
  resultSection.classList.remove('hidden');
  downloadBtn.href = `/download/${jobId}`;
}

function showError(msg) {
  progressSection.classList.add('hidden');
  errorSection.classList.remove('hidden');
  errorMsg.textContent = msg;
}

function reset() {
  selectedFile = null;
  fileInput.value = '';
  dropZone.classList.remove('has-file', 'dragover');
  dropZone.querySelector('.drop-icon').textContent = '🎵';
  const sub = dropZone.querySelector('.drop-sub');
  sub.textContent = 'または'; sub.classList.remove('drop-filename');
  progressBar.style.width = '0%'; progressPct.textContent = '0%';
  logBox.innerHTML = '';
  uploadSection.classList.remove('hidden');
  progressSection.classList.add('hidden');
  resultSection.classList.add('hidden');
  errorSection.classList.add('hidden');
  updateStartBtn();
}

document.getElementById('resetBtn').addEventListener('click', reset);
document.getElementById('resetBtnErr').addEventListener('click', reset);

// 起動
initAuth().then(() => updateStartBtn());