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<!DOCTYPE html>
<html lang="vi">
<head>
    <meta charset="UTF-8">
    <title>Expert Audio Analyzer - ARG Decoder PRO</title>
    <style>
        body { background: #0a0a0a; color: #00ff41; font-family: 'Courier New', monospace; overflow: hidden; margin: 0; }
        #container { display: flex; flex-direction: column; height: 100vh; padding: 10px; box-sizing: border-box; }
        canvas { width: 100%; background: #000; border: 1px solid #333; display: block; }
        .controls { background: #1a1a1a; padding: 10px 15px; display: flex; flex-wrap: wrap; gap: 15px; align-items: center; font-size: 12px; border-bottom: 2px solid #00ff41; }
        input[type="file"] { color: #00ff41; width: 200px; }
        .stat-box { border-left: 2px solid #00ff41; padding-left: 10px; display: flex; align-items: center; gap: 5px; }
        button { background: #00ff41; color: #000; border: none; padding: 5px 15px; cursor: pointer; font-weight: bold; }
        button:hover { background: #00cc33; }
        #freqCanvas { flex-grow: 1; }
        #specCanvas { height: 250px; margin-top: 5px; cursor: crosshair; }
        #timeCanvas { height: 100px; margin-top: 5px; }
        label { font-weight: bold; color: #aaa; }
    </style>
</head>
<body>
    <div id="container">
        <div class="controls">
            <div>
                <label>SOURCE:</label>
                <input type="file" id="audioFile" accept="audio/*">
            </div>
            <div class="stat-box">
                <label>FFT:</label>
                <select id="fftControl">
                    <option value="1024">1024</option>
                    <option value="2048">2048</option>
                    <option value="4096">4096</option>
                    <option value="8192">8192</option>
                    <option value="16384" selected>16384 (ARG Mode)</option>
                    <option value="32768">32768 (Ultra Deep)(Không khuyến khích)</option>
                </select>
            </div>
            <div class="stat-box">
                <label>SMOOTHING:</label>
                <input type="range" id="smoothControl" min="0" max="0.95" step="0.05" value="0.0"> </div>
            <div class="stat-box">
                <label>SPEC ZOOM:</label>
                <input type="range" id="specZoom" min="1" max="8" step="0.1" value="1">
            </div>
            <div class="stat-box">
                <label>SHOW SPEC:</label>
                <input type="checkbox" id="showSpec" checked>
            </div>
            <button id="playBtn">PLAY/PAUSE</button>
        </div>

        <canvas id="freqCanvas"></canvas>
        <canvas id="specCanvas"></canvas>
        <canvas id="timeCanvas"></canvas>
    </div>

<script>
const audioFile = document.getElementById('audioFile');
const fftControl = document.getElementById('fftControl');
const smoothControl = document.getElementById('smoothControl');
const specZoom = document.getElementById('specZoom');
const showSpec = document.getElementById('showSpec');
const playBtn = document.getElementById('playBtn');

const fCanvas = document.getElementById('freqCanvas');
const sCanvas = document.getElementById('specCanvas');
const tCanvas = document.getElementById('timeCanvas');
const fCtx = fCanvas.getContext('2d');
const sCtx = sCanvas.getContext('2d');
const tCtx = tCanvas.getContext('2d');

// Canvas phụ để xử lý cuộn Spectrogram mượt mà
const offscreenCanvas = document.createElement('canvas');
const offCtx = offscreenCanvas.getContext('2d');

let audioCtx, analyser, source, dataArray, bufferLength;
let isPlaying = false;
let audioTag = new Audio();
audioTag.crossOrigin = "anonymous";

function initAudio() {
    if (audioCtx) return;
    audioCtx = new (window.AudioContext || window.webkitAudioContext)();
    analyser = audioCtx.createAnalyser();
    updateAnalyserSettings();

    source = audioCtx.createMediaElementSource(audioTag);
    source.connect(analyser);
    analyser.connect(audioCtx.destination);

    bufferLength = analyser.frequencyBinCount;
    dataArray = new Uint8Array(bufferLength);
}

function updateAnalyserSettings() {
    if (analyser) {
        analyser.fftSize = parseInt(fftControl.value);
        analyser.smoothingTimeConstant = parseFloat(smoothControl.value);
        bufferLength = analyser.frequencyBinCount;
        dataArray = new Uint8Array(bufferLength);
    }
}

audioFile.onchange = function() {
    const file = this.files[0];
    if (file) {
        audioTag.src = URL.createObjectURL(file);
        if (!audioCtx) initAudio();
    }
};

playBtn.onclick = () => {
    if (!audioCtx) initAudio();
    if (audioCtx.state === 'suspended') audioCtx.resume();

    if (isPlaying) {
        audioTag.pause();
        isPlaying = false;
    } else {
        audioTag.play();
        isPlaying = true;
        requestAnimationFrame(draw);
    }
};

fftControl.onchange = updateAnalyserSettings;
smoothControl.onchange = updateAnalyserSettings;

function draw() {
    if (!isPlaying) return;
    requestAnimationFrame(draw);

    // Resize canvases
    [fCanvas, sCanvas, tCanvas].forEach(c => {
        if (c.width !== c.clientWidth || c.height !== c.clientHeight) {
            c.width = c.clientWidth;
            c.height = c.clientHeight;
        }
    });

    analyser.getByteFrequencyData(dataArray);

    // 1. VẼ FREQUENCY DOMAIN (BARS)
    fCtx.fillStyle = '#000';
    fCtx.fillRect(0, 0, fCanvas.width, fCanvas.height);
    const barWidth = (fCanvas.width / bufferLength) * 2;
    let x = 0;
    for (let i = 0; i < bufferLength; i++) {
        const barHeight = (dataArray[i] / 255) * fCanvas.height;
        fCtx.fillStyle = `rgb(${dataArray[i]+50}, ${i/bufferLength*255}, 50)`;
        fCtx.fillRect(x, fCanvas.height - barHeight, barWidth, barHeight);
        x += barWidth;
    }

    // 2. VẼ SPECTROGRAM (Cuộn từ phải sang trái)
    if (showSpec.checked) {
        sCanvas.style.display = 'block';
        if (offscreenCanvas.width !== sCanvas.width || offscreenCanvas.height !== sCanvas.height) {
            offscreenCanvas.width = sCanvas.width;
            offscreenCanvas.height = sCanvas.height;
            offCtx.fillStyle = '#000';
            offCtx.fillRect(0,0, offscreenCanvas.width, offscreenCanvas.height);
        }

        // Trượt hình ảnh cũ sang trái
        offCtx.drawImage(offscreenCanvas, -2, 0);

        const zoom = parseFloat(specZoom.value);
        const step = sCanvas.height / (bufferLength / zoom);

        for (let i = 0; i < bufferLength / zoom; i++) {
            const val = dataArray[i];
            // Bảng màu Heatmap: Đen -> Tím -> Đỏ -> Vàng -> Trắng
            offCtx.fillStyle = `rgb(${val > 100 ? val : val/2}, ${val > 180 ? val : 0}, ${val < 100 ? val*2 : 0})`;
            if (val > 200) offCtx.fillStyle = '#fff'; // Điểm cực đại hiện màu trắng để soi chữ

            offCtx.fillRect(offscreenCanvas.width - 2, sCanvas.height - (i * step), 2, step);
        }
        sCtx.drawImage(offscreenCanvas, 0, 0);
    } else {
        sCanvas.style.display = 'none';
    }

    // 3. VẼ TIME DOMAIN (OSCILLOSCOPE)
    analyser.getByteTimeDomainData(dataArray);
    tCtx.fillStyle = 'rgba(0, 5, 0, 0.2)';
    tCtx.fillRect(0, 0, tCanvas.width, tCanvas.height);
    tCtx.lineWidth = 2;
    tCtx.strokeStyle = '#00ff41';
    tCtx.beginPath();
    const sliceWidth = tCanvas.width / bufferLength;
    let tx = 0;
    for (let i = 0; i < bufferLength; i++) {
        const v = dataArray[i] / 128.0;
        const ty = v * tCanvas.height / 2;
        i === 0 ? tCtx.moveTo(tx, ty) : tCtx.lineTo(tx, ty);
        tx += sliceWidth;
    }
    tCtx.lineTo(tCanvas.width, tCanvas.height / 2);
    tCtx.stroke();
}
</script>
</body>
</html>