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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8" />
  <title>Web DAW – AI Music Idea Helper (Transformers.js Demo)</title>
  <meta name="viewport" content="width=device-width,initial-scale=1" />
  <link rel="stylesheet" href="style.css" />
</head>
<body>
  <header class="app-header">
    <div class="logo-title">
      <div class="logo-dot"></div>
      <div>
        <h1>Web DAW – AI Music Idea Helper</h1>
        <p class="subtitle">
          Browser-based multi-track sketchpad with AI-powered composition ideas (Transformers.js)
        </p>
      </div>
    </div>
    <nav class="header-links">
      <a href="https://huggingface.co/spaces/akhaliq/anycoder" target="_blank" rel="noopener">
        Built with anycoder
      </a>
      <a href="https://huggingface.co/docs/transformers.js/index" target="_blank" rel="noopener">
        transformers.js docs
      </a>
    </nav>
  </header>

  <main class="app-main">
    <section class="left-panel">
      <section class="ai-panel card">
        <h2>AI Song Starter</h2>
        <p class="help-text">
          Use a local Transformers.js model (running entirely in your browser) to generate text prompts
          like chord ideas, drum patterns, or arrangement suggestions. Paste the results into your
          tracks and tweak them.
        </p>

        <div class="field">
          <label for="ai-genre">Genre / Style</label>
          <input id="ai-genre" type="text" placeholder="lofi hip hop, drill, EDM, pop, trap..." />
        </div>

        <div class="field">
          <label for="ai-mood">Mood / Vibe</label>
          <input id="ai-mood" type="text" placeholder="chill, dark, uplifting, emotional, aggressive..." />
        </div>

        <div class="field">
          <label for="ai-task">What do you want?</label>
          <select id="ai-task">
            <option value="chords">Chord progression idea</option>
            <option value="drums">Drum pattern idea</option>
            <option value="melody">Melody / hook idea</option>
            <option value="arrangement">Arrangement suggestion (A/B sections)</option>
            <option value="mix">Mixing suggestions</option>
          </select>
        </div>

        <button id="generate-idea-btn" class="primary-btn" disabled>
          Load model…
        </button>

        <div id="model-status" class="status status-loading">
          Loading Transformers.js in a Web Worker…
        </div>
        <div id="model-progress" class="progress-container hidden">
          <div class="progress-label">
            Model download:
            <span id="model-progress-text">0%</span>
          </div>
          <div class="progress-bar">
            <div id="model-progress-bar-inner"></div>
          </div>
        </div>

        <div id="ai-error" class="status status-error hidden"></div>

        <label for="ai-output">AI Output (editable)</label>
        <textarea id="ai-output" rows="7" placeholder="AI suggestions will appear here. You can edit and copy them into your tracks."></textarea>

        <div class="ai-quick-examples">
          <span>Quick examples:</span>
          <button class="chip" data-example="lofi hip hop|chill|chords">Lofi chords</button>
          <button class="chip" data-example="trap|dark|drums">Trap drums</button>
          <button class="chip" data-example="house|uplifting|arrangement">House arrangement</button>
        </div>
      </section>

      <section class="project-panel card">
        <h2>Project Notes & Export</h2>
        <div class="field">
          <label for="project-title">Project title</label>
          <input id="project-title" type="text" placeholder="My Web3 Beat v1" />
        </div>
        <div class="field">
          <label for="project-bpm">Tempo (BPM)</label>
          <input id="project-bpm" type="number" min="60" max="200" value="90" />
        </div>
        <div class="field">
          <label for="project-key">Key</label>
          <input id="project-key" type="text" placeholder="C minor, F# dorian…" />
        </div>
        <button id="export-json-btn" class="secondary-btn">Export sketch as JSON</button>
        <p class="small-text">
          This demo exports a JSON snapshot of the sequencer state (timeline, grid, and notes),
          representing how a real cloud sync API might serialize projects.
        </p>
        <a id="download-link" class="hidden"></a>
      </section>
    </section>

    <section class="daw-panel card">
      <div class="daw-header">
        <h2>Sequencer & Step Grid</h2>
        <div class="transport">
          <button id="play-btn" class="icon-btn"></button>
          <button id="stop-btn" class="icon-btn"></button>
          <label class="checkbox-inline">
            <input type="checkbox" id="metronome-toggle" checked />
            Metronome
          </label>
        </div>
      </div>

      <div class="timeline-meta">
        <div>Bars: <span id="bars-count">4</span></div>
        <div>Resolution: 16th notes</div>
        <div>Grid snap: On</div>
      </div>

      <div class="tracks-container">
        <div class="tracks-sidebar">
          <div class="track-strip" data-track="0">
            <div class="track-header">
              <div class="track-name">Kick</div>
              <div class="track-controls">
                <button class="mute-btn" data-track="0">M</button>
                <button class="solo-btn" data-track="0">S</button>
              </div>
            </div>
            <div class="track-faders">
              <label>Vol</label>
              <input type="range" min="0" max="1" step="0.01" value="0.9" data-type="gain" data-track="0" />
            </div>
          </div>

          <div class="track-strip" data-track="1">
            <div class="track-header">
              <div class="track-name">Snare</div>
              <div class="track-controls">
                <button class="mute-btn" data-track="1">M</button>
                <button class="solo-btn" data-track="1">S</button>
              </div>
            </div>
            <div class="track-faders">
              <label>Vol</label>
              <input type="range" min="0" max="1" step="0.01" value="0.8" data-type="gain" data-track="1" />
            </div>
          </div>

          <div class="track-strip" data-track="2">
            <div class="track-header">
              <div class="track-name">Hi-hat</div>
              <div class="track-controls">
                <button class="mute-btn" data-track="2">M</button>
                <button class="solo-btn" data-track="2">S</button>
              </div>
            </div>
            <div class="track-faders">
              <label>Vol</label>
              <input type="range" min="0" max="1" step="0.01" value="0.7" data-type="gain" data-track="2" />
            </div>
          </div>

          <div class="track-strip" data-track="3">
            <div class="track-header">
              <div class="track-name">Bass (AI idea)</div>
              <div class="track-controls">
                <button class="mute-btn" data-track="3">M</button>
                <button class="solo-btn" data-track="3">S</button>
              </div>
            </div>
            <div class="track-faders">
              <label>Vol</label>
              <input type="range" min="0" max="1" step="0.01" value="0.8" data-type="gain" data-track="3" />
            </div>
          </div>
        </div>

        <div class="grid-and-editors">
          <!-- Step sequencer grid -->
          <div class="step-grid-container">
            <div class="step-grid-header">
              <div class="label">Step Sequencer (16-step loop)</div>
              <button id="clear-grid-btn" class="secondary-btn small">Clear</button>
            </div>
            <div id="step-grid" class="step-grid"></div>
          </div>

          <!-- Simple "piano roll" for melody track (bar-based, very simplified) -->
          <div class="piano-roll-container">
            <div class="piano-roll-header">
              <div class="label">Melody Sketch (text based)</div>
            </div>
            <textarea id="melody-notes" rows="4"
              placeholder="Use this area to convert AI chord/melody ideas into a structure, e.g.:
Bar 1: Cmin - Gmin
Bar 2: Ebmaj - Fmin
Bar 3: Abmaj - Gmin
Bar 4: turnaround…"
            ></textarea>
          </div>
        </div>
      </div>

      <div class="footer-hint">
        This is a focused demo: Web Audio is used for a simple 4‑track drum loop engine,
        while Transformers.js (via Web Worker) powers AI text suggestions for chords, drums,
        and mix tips – matching the “AI-powered creativity” section of the spec.
        In a full app, this engine would be extended into the multi-track DAW, cloud,
        and collaboration architecture you described.
      </div>
    </section>
  </main>

  <script src="index.js" type="module"></script>
</body>
</html>