// AKAI Utils — Web UI
const API = '/api';

let eventSource = null;

// ─── Search ────────────────────────────────────────────────────────

document.getElementById('search-btn').addEventListener('click', doSearch);
document.getElementById('search-query').addEventListener('keydown', e => {
  if (e.key === 'Enter') doSearch();
});
document.getElementById('search-dl-all').addEventListener('click', downloadTop10);

async function doSearch() {
  const q = document.getElementById('search-query').value;
  const filter = document.getElementById('search-filter').value;
  const status = document.getElementById('search-status');
  const results = document.getElementById('search-results');

  status.textContent = 'Searching...';
  results.innerHTML = '';

  try {
    const params = new URLSearchParams();
    if (q) params.set('q', q);
    if (filter) params.set('filter', filter);
    params.set('limit', '50');

    const resp = await fetch(`${API}/search?${params}`);
    const data = await resp.json();
    status.textContent = `Found ${data.length} items`;
    document.getElementById('result-count').textContent = `(${data.length})`;
    renderResults(data);
  } catch (e) {
    status.textContent = 'Search failed: ' + e.message;
  }
}

function renderResults(items) {
  const container = document.getElementById('search-results');
  container.innerHTML = items.map(r => `
    <div class="result-card">
      <div class="title">${esc(r.title)}</div>
      <div class="meta">
        <span>${r.identifier}</span>
        <span>${r.downloads.toLocaleString()} downloads</span>
      </div>
      <div class="actions">
        <button class="btn-dl" data-action="download" data-identifier="${esc(r.identifier)}">Download ISOs</button>
        <button class="btn-list" data-action="list" data-identifier="${esc(r.identifier)}">List Files</button>
      </div>
      <div id="list-${sanitize(r.identifier)}" class="file-list"></div>
    </div>
  `).join('');
}

async function downloadTop10() {
  const q = document.getElementById('search-query').value;
  const filter = document.getElementById('search-filter').value;
  const params = new URLSearchParams();
  if (q) params.set('q', q);
  if (filter) params.set('filter', filter);
  params.set('limit', '10');

  try {
    const resp = await fetch(`${API}/search?${params}`);
    const data = await resp.json();
    for (const item of data) {
      await downloadItem(item.identifier);
    }
  } catch (e) {
    alert('Bulk download failed: ' + e.message);
  }
}

// ─── List ──────────────────────────────────────────────────────────

async function listItem(identifier) {
  const el = document.getElementById('list-' + sanitize(identifier));
  el.innerHTML = 'Loading...';

  try {
    const resp = await fetch(`${API}/list?identifier=${encodeURIComponent(identifier)}`);
    const files = await resp.json();
    if (!Array.isArray(files) || files.length === 0) {
      el.innerHTML = '<span class="no-files">No ISO files</span>';
      return;
    }
    el.innerHTML = files.map(f =>
      `<div class="file-row">${esc(f.name)} <span class="file-size">${f.size || '?'}</span></div>`
    ).join('');
  } catch (e) {
    el.innerHTML = 'Failed: ' + e.message;
  }
}

// ─── Download ──────────────────────────────────────────────────────

async function downloadItem(identifier) {
  try {
    const resp = await fetch(`${API}/download?identifier=${encodeURIComponent(identifier)}&dir=./output/isos`);
    const data = await resp.json();
    if (data.error) {
      alert(data.error);
      return;
    }
    startProgressStream();
  } catch (e) {
    alert('Download failed: ' + e.message);
  }
}

function startProgressStream() {
  if (eventSource) eventSource.close();
  eventSource = new EventSource(`${API}/progress`);

  eventSource.onmessage = function(e) {
    const jobs = JSON.parse(e.data);
    renderDownloadQueue(jobs);

    const allDone = Object.values(jobs).every(j => j.done || j.error);
    if (allDone && Object.keys(jobs).length > 0) {
      eventSource.close();
      eventSource = null;
    }
  };

  eventSource.onerror = function() {
    if (eventSource) {
      eventSource.close();
      eventSource = null;
    }
  };
}

function renderDownloadQueue(jobs) {
  const container = document.getElementById('download-queue');
  const count = document.getElementById('dl-count');
  const entries = Object.values(jobs);
  count.textContent = `(${entries.length})`;

  container.innerHTML = entries.map(j => {
    const pct = j.total_size > 0 ? Math.round(j.downloaded / j.total_size * 100) : 0;
    let cls = '';
    if (j.error) cls = 'error';
    else if (j.done) cls = 'done';

    let info = '';
    if (j.error) info = j.error;
    else if (j.done) info = formatBytes(j.total_size) + ' — complete';
    else info = formatBytes(j.downloaded) + ' / ' + formatBytes(j.total_size) +
                (j.speed > 0 ? ' — ' + formatBytes(j.speed) + '/s' : '');

    return `
      <div class="dl-item">
        <div class="dl-name">${esc(j.file_name)}</div>
        <div class="dl-bar"><div class="dl-bar-fill ${cls}" style="width:${pct}%"></div></div>
        <div class="dl-info"><span>${info}</span><span>${j.done && !j.error ? '✓' : pct + '%'}</span></div>
      </div>`;
  }).join('');
}

// ─── Extract ───────────────────────────────────────────────────────

document.getElementById('extract-btn').addEventListener('click', doExtract);

async function doExtract() {
  const isoDir = document.getElementById('extract-iso-dir').value;
  const wavDir = document.getElementById('extract-wav-dir').value;
  const status = document.getElementById('extract-status');

  status.textContent = 'Extracting... (check server console for output)';
  status.style.color = 'var(--yellow)';

  try {
    const resp = await fetch(`${API}/extract?dir=${encodeURIComponent(isoDir)}&out=${encodeURIComponent(wavDir)}`);
    const data = await resp.json();
    status.textContent = data.message || 'Extraction complete';
    status.style.color = 'var(--green)';
  } catch (e) {
    status.textContent = 'Extraction failed: ' + e.message;
    status.style.color = 'var(--accent)';
  }
}

// ─── WAV Browser ──────────────────────────────────────────────────

let audioCtx = null;
let currentSource = null;
let currentAudioBuffer = null;
let startTime = 0;
let pauseOffset = 0;
let isPlaying = false;
let animationFrame = null;

document.getElementById('wav-browse-btn').addEventListener('click', browseWavs);

async function browseWavs() {
  const dir = document.getElementById('wav-dir').value;
  const list = document.getElementById('wav-list');
  list.innerHTML = 'Loading...';
  console.log('browseWavs: dir =', dir);

  try {
    const url = `${API}/list-wavs?dir=${encodeURIComponent(dir)}`;
    console.log('browseWavs: fetching', url);
    const resp = await fetch(url);
    console.log('browseWavs: response status', resp.status, 'ok', resp.ok);

    if (!resp.ok) {
      list.innerHTML = '<span class="no-files">HTTP ' + resp.status + '</span>';
      return;
    }
    const data = await resp.json();
    console.log('browseWavs: parsed data', data, 'type', typeof data, 'isArray', Array.isArray(data));
    if (!data || data.error) {
      list.innerHTML = '<span class="no-files">Error: ' + (data && data.error ? data.error : 'server error') + '</span>';
      return;
    }
    if (!Array.isArray(data) || data.length === 0) {
      list.innerHTML = '<span class="no-files">No WAV files found</span>';
      return;
    }
    console.log('browseWavs: found', data.length, 'wavs');
    list.innerHTML = data.map(f => `
      <div class="wav-item" data-file="${esc(f)}">
        <span class="wav-name" title="${esc(f)}">${esc(f)}</span>
        <button class="wav-play-btn" data-action="play" data-wav="${esc(f)}">Play</button>
      </div>
    `).join('');
  } catch (e) {
    console.error('browseWavs: error', e);
    list.innerHTML = 'Failed: ' + e.message;
  }
}

async function playWav(filename) {
  console.log('playWav:', filename);
  if (!audioCtx) {
    audioCtx = new AudioContext();
    console.log('playWav: created AudioContext');
  }

  if (currentSource) {
    currentSource.stop();
    currentSource = null;
  }
  if (animationFrame) {
    cancelAnimationFrame(animationFrame);
    animationFrame = null;
  }

  const nowPlaying = document.getElementById('wav-now-playing');
  nowPlaying.textContent = 'Loading: ' + filename;

  try {
    const resp = await fetch(`/wavs/${encodeURIComponent(filename)}`);
    if (!resp.ok) throw new Error('HTTP ' + resp.status);
    const arrayBuffer = await resp.arrayBuffer();
    currentAudioBuffer = await audioCtx.decodeAudioData(arrayBuffer);

    currentSource = audioCtx.createBufferSource();
    currentSource.buffer = currentAudioBuffer;
    currentSource.connect(audioCtx.destination);

    currentSource.onended = () => {
      if (isPlaying) {
        isPlaying = false;
        pauseOffset = 0;
        nowPlaying.textContent = '';
        document.getElementById('wav-progress-fill').style.width = '0%';
        document.getElementById('wav-time').textContent = formatTime(0);
        clearActiveItem();
      }
    };

    startTime = audioCtx.currentTime - pauseOffset;
    currentSource.start(0, pauseOffset);
    isPlaying = true;
    pauseOffset = 0;

    nowPlaying.textContent = '▶ ' + filename;
    setActiveItem(filename);
    updateProgress();
  } catch (e) {
    nowPlaying.textContent = 'Error: ' + e.message;
  }
}

function updateProgress() {
  if (!isPlaying || !currentAudioBuffer) return;

  const elapsed = audioCtx.currentTime - startTime;
  const duration = currentAudioBuffer.duration;
  const pct = Math.min((elapsed / duration) * 100, 100);

  document.getElementById('wav-progress-fill').style.width = pct + '%';
  document.getElementById('wav-time').textContent = formatTime(elapsed);

  if (elapsed < duration) {
    animationFrame = requestAnimationFrame(updateProgress);
  }
}

function formatTime(secs) {
  const m = Math.floor(secs / 60);
  const s = Math.floor(secs % 60);
  return m + ':' + s.toString().padStart(2, '0');
}

function setActiveItem(filename) {
  document.querySelectorAll('.wav-item').forEach(el => {
    el.classList.toggle('playing', el.dataset.file === filename);
  });
}

function clearActiveItem() {
  document.querySelectorAll('.wav-item').forEach(el => {
    el.classList.remove('playing');
  });
}

// ─── Helpers ──────────────────────────────────────────────────────

function esc(s) {
  if (!s) return '';
  return s.replace(/&/g, '&amp;').replace(/</g, '&lt;')
          .replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#39;');
}

function sanitize(s) {
  return s.replace(/[^a-zA-Z0-9_-]/g, '_');
}

function formatBytes(bytes) {
  if (bytes === 0) return '0 B';
  const k = 1024;
  const sizes = ['B', 'KB', 'MB', 'GB'];
  const i = Math.floor(Math.log(bytes) / Math.log(k));
  return parseFloat((bytes / Math.pow(k, i)).toFixed(1)) + ' ' + sizes[i];
}

// Initial load
doSearch();

// Event delegation for dynamically generated buttons
document.addEventListener('click', function(e) {
  const btn = e.target.closest('[data-action]');
  if (!btn) return;
  const action = btn.dataset.action;
  if (action === 'download') {
    downloadItem(btn.dataset.identifier);
  } else if (action === 'list') {
    listItem(btn.dataset.identifier);
  } else if (action === 'play') {
    playWav(btn.dataset.wav);
  }
});