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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>语音交互系统</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f5f5f5;
        }
        .section {
            margin-bottom: 20px;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: 8px;
            background-color: white;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        h2 {
            color: #333;
            border-bottom: 1px solid #eee;
            padding-bottom: 10px;
        }
        button {
            padding: 10px 15px;
            margin-right: 10px;
            margin-bottom: 10px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 14px;
            transition: background-color 0.3s;
        }
        button:hover {
            background-color: #45a049;
        }
        button:disabled {
            background-color: #cccccc;
            cursor: not-allowed;
        }
        #transcript, #response {
            margin-top: 10px;
            padding: 12px;
            border: 1px solid #ccc;
            min-height: 100px;
            border-radius: 4px;
            background-color: #f9f9f9;
            font-size: 14px;
            line-height: 1.5;
        }
        input[type="text"] {
            width: 100%;
            padding: 10px;
            margin-bottom: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 14px;
        }
        .audio-controls {
            margin-top: 10px;
            display: flex;
            gap: 10px;
        }
        .audio-player {
            margin-top: 15px;
        }
        .loading {
            display: none;
            margin: 15px 0;
            padding: 10px;
            background-color: #f0f0f0;
            border-radius: 4px;
            text-align: center;
            color: #666;
        }
        .save-controls {
            margin-top: 15px;
            display: flex;
            gap: 10px;
        }
        .interaction-history {
            margin-top: 20px;
            padding: 10px;
            background-color: #f0f0f0;
            border-radius: 4px;
            max-height: 200px;
            overflow-y: auto;
        }
        .user-message {
            background-color: #e3f2fd;
            padding: 10px;
            border-radius: 4px;
            margin-bottom: 10px;
        }
        .system-message {
            background-color: #e8f5e9;
            padding: 10px;
            border-radius: 4px;
            margin-bottom: 10px;
        }
    </style>
</head>
<body>
<div class="section">
    <h2>语音交互系统</h2>
    <p>支持语音输入和文字输入，系统将自动回答您的问题。</p>
</div>

<div class="section">
    <h2>语音输入</h2>
    <div class="audio-controls">
        <button id="startRecording">开始录音</button>
        <button id="stopRecording" disabled>停止录音</button>
    </div>
    <div id="transcript" contenteditable="true">录音转写内容将显示在这里...</div>
</div>

<div class="section">
    <h2>文字输入</h2>
    <input type="text" id="textInput" placeholder="请输入文字">
    <button id="textSubmit">提交文字</button>
    <div id="response">系统回答将显示在这里...</div>
</div>

<div class="section">
    <h2>音频播放</h2>
    <div class="audio-player">
        <h3>用户录音：</h3>
        <audio id="userAudio" controls></audio>
        <h3>系统回答：</h3>
        <audio id="systemAudio" controls></audio>
    </div>
    <div class="loading" id="loading">正在处理请求，请稍候...</div>
    <div class="save-controls">
        <button id="saveWav">保存为WAV</button>
        <button id="savePcm">保存为PCM</button>
    </div>
</div>

<div class="section">
    <h2>交互历史</h2>
    <div id="interactionHistory" class="interaction-history"></div>
</div>

<script>
    let audioContext;
    let mediaStream;
    let scriptProcessor;
    let audioBuffer = [];
    let isRecording = false;
    const TARGET_SAMPLE_RATE = 16000;
    let lastRecordedPcmData = null;
    let lastRecordedWavBlob = null;

    // 初始化音频上下文
    function initAudioContext() {
        audioContext = new (window.AudioContext || window.webkitAudioContext)({
            sampleRate: TARGET_SAMPLE_RATE
        });
    }

    // 开始录音
    document.getElementById('startRecording').addEventListener('click', async () => {
        try {
            const stream = await navigator.mediaDevices.getUserMedia({
                audio: {
                    sampleRate: TARGET_SAMPLE_RATE,
                    channelCount: 1,
                    echoCancellation: true,
                    noiseSuppression: true
                }
            });
            mediaStream = stream;
            initAudioContext();

            const source = audioContext.createMediaStreamSource(stream);
            scriptProcessor = audioContext.createScriptProcessor(16384, 1, 1);
            scriptProcessor.onaudioprocess = handleAudioProcess;
            source.connect(scriptProcessor);
            scriptProcessor.connect(audioContext.destination);

            isRecording = true;
            document.getElementById('startRecording').disabled = true;
            document.getElementById('stopRecording').disabled = false;
        } catch (err) {
            console.error('录音错误:', err);
            alert('无法启动录音，请检查麦克风权限。');
        }
    });

    // 处理音频数据
    function handleAudioProcess(event) {
        if (!isRecording) return;
        const inputBuffer = event.inputBuffer;
        const data = inputBuffer.getChannelData(0);
        audioBuffer.push(new Float32Array(data));
    }

    // 停止录音
    document.getElementById('stopRecording').addEventListener('click', () => {
        if (mediaStream && isRecording) {
            mediaStream.getTracks().forEach(track => track.stop());
            scriptProcessor.disconnect();
            isRecording = false;
            document.getElementById('startRecording').disabled = false;
            document.getElementById('stopRecording').disabled = true;

            // 将音频数据转换为PCM
            convertAudioBufferToPCM();
        }
    });

    // 将音频数据转换为PCM
    function convertAudioBufferToPCM() {
        // 计算总采样点数
        let totalSamples = 0;
        for (let i = 0; i < audioBuffer.length; i++) {
            totalSamples += audioBuffer[i].length;
        }

        // 创建正确大小的数组
        const audioData = new Float32Array(totalSamples);
        let offset = 0;

        // 复制音频数据
        for (let i = 0; i < audioBuffer.length; i++) {
            audioData.set(audioBuffer[i], offset);
            offset += audioBuffer[i].length;
        }

        // 将Float32Array转换为Int16Array（PCM格式）
        const pcmData = new Int16Array(audioData.length);
        for (let i = 0; i < audioData.length; i++) {
            pcmData[i] = Math.max(-1, Math.min(1, audioData[i])) * 0x7FFF;
        }

        // 创建WAV文件头
        const wavHeader = new Uint8Array([
            82, 73, 70, 70, // "RIFF" 标识
            0, 0, 0, 0,     // 文件大小（待填充）
            87, 65, 86, 69, // "WAVE" 标识
            102, 109, 116, 32, // "fmt " 标识
            16, 0, 0, 0,    // fmt块大小
            1, 0,           // 音频格式，1表示PCM
            1, 0,           // 声道数，1表示单声道
            TARGET_SAMPLE_RATE & 0xFF, (TARGET_SAMPLE_RATE >> 8) & 0xFF, (TARGET_SAMPLE_RATE >> 16) & 0xFF, (TARGET_SAMPLE_RATE >> 24) & 0xFF, // 采样率
            (TARGET_SAMPLE_RATE * 2) & 0xFF, ((TARGET_SAMPLE_RATE * 2) >> 8) & 0xFF, ((TARGET_SAMPLE_RATE * 2) >> 16) & 0xFF, ((TARGET_SAMPLE_RATE * 2) >> 24) & 0xFF, // 字节率
            2, 0,           // 块对齐
            16, 0,          // 位深度
            100, 97, 116, 97, // "data" 标识
            0, 0, 0, 0      // 数据大小（待填充）
        ]);

        // 填充文件大小和数据大小
        const dataSize = pcmData.length * 2; // 16位 = 2字节
        const fileSize = dataSize + 36; // 文件总大小 = 数据大小 + 头部大小(44字节)

        // 填充文件大小（4-7字节）
        wavHeader[4] = fileSize & 0xFF;
        wavHeader[5] = (fileSize >> 8) & 0xFF;
        wavHeader[6] = (fileSize >> 16) & 0xFF;
        wavHeader[7] = (fileSize >> 24) & 0xFF;

        // 填充数据大小（40-43字节）
        wavHeader[40] = dataSize & 0xFF;
        wavHeader[41] = (dataSize >> 8) & 0xFF;
        wavHeader[42] = (dataSize >> 16) & 0xFF;
        wavHeader[43] = (dataSize >> 24) & 0xFF;

        // 创建WAV Blob
        lastRecordedWavBlob = new Blob([wavHeader, pcmData.buffer], { type: 'audio/wav' });
        lastRecordedPcmData = pcmData;

        // 创建音频URL并播放
        const audioUrl = URL.createObjectURL(lastRecordedWavBlob);
        document.getElementById('userAudio').src = audioUrl;
        document.getElementById('userAudio').load();

        // 上传PCM数据
        const formData = new FormData();
        const pcmBlob = new Blob([pcmData.buffer], { type: 'audio/pcm' });
        formData.append('audio', pcmBlob, 'recording.pcm');

        // 显示加载提示
        document.getElementById('loading').style.display = 'block';

        // 发送到后端进行处理
        fetchAudioResponse(formData);
    }

    // 保存WAV文件
    document.getElementById('saveWav').addEventListener('click', () => {
        if (lastRecordedWavBlob) {
            const url = URL.createObjectURL(lastRecordedWavBlob);
            const a = document.createElement('a');
            a.href = url;
            a.download = `recording_${new Date().toISOString().replace(/[:.]/g, '-')}.wav`;
            document.body.appendChild(a);
            a.click();
            document.body.removeChild(a);
            URL.revokeObjectURL(url);
        } else {
            alert('没有可保存的录音！');
        }
    });

    // 保存PCM文件
    document.getElementById('savePcm').addEventListener('click', () => {
        if (lastRecordedPcmData) {
            const pcmBlob = new Blob([lastRecordedPcmData.buffer], { type: 'audio/pcm' });
            const url = URL.createObjectURL(pcmBlob);
            const a = document.createElement('a');
            a.href = url;
            a.download = `recording_${new Date().toISOString().replace(/[:.]/g, '-')}.pcm`;
            document.body.appendChild(a);
            a.click();
            document.body.removeChild(a);
            URL.revokeObjectURL(url);
        } else {
            alert('没有可保存的录音！');
        }
    });

    // 文字输入功能
    document.getElementById('textSubmit').addEventListener('click', () => {
        const text = document.getElementById('textInput').value.trim();
        if (!text) {
            alert('请输入文字内容！');
            return;
        }

        // 创建表单数据
        const formData = new FormData();
        formData.append('context', text);

        // 显示加载提示
        document.getElementById('loading').style.display = 'block';

        // 发送到后端进行处理
        fetchAudioResponse(formData);
    });

    // 获取音频响应
    function fetchAudioResponse(formData) {
        const systemAudio = document.getElementById('systemAudio');
        const loading = document.getElementById('loading');

        // 创建MediaSource
        const mediaSource = new MediaSource();
        systemAudio.src = URL.createObjectURL(mediaSource);

        // 准备接收数据
        mediaSource.addEventListener('sourceopen', () => {
            // 检查浏览器是否支持所需的MIME类型
            if (!MediaSource.isTypeSupported('audio/mpeg')) {
                console.error('浏览器不支持audio/mpeg格式');
                loading.style.display = 'none';
                return;
            }

            const sourceBuffer = mediaSource.addSourceBuffer('audio/mpeg');
            const queue = [];
            let isAppending = false;

            function appendNextChunk() {
                if (queue.length > 0 && !isAppending && !sourceBuffer.updating) {
                    isAppending = true;
                    const chunk = queue.shift();
                    sourceBuffer.appendBuffer(chunk);
                }
            }

            sourceBuffer.addEventListener('updateend', () => {
                isAppending = false;
                appendNextChunk();
            });

            sourceBuffer.addEventListener('error', (e) => {
                console.error('SourceBuffer error:', e);
                loading.style.display = 'none';
            });

            // 发送请求到后端
            fetch('http://localhost:26061/dify/audio/voice', {
                method: 'POST',
                body: formData
            })
                .then(response => {
                    if (!response.ok) {
                        throw new Error('Network response was not ok');
                    }
                    return response.body;
                })
                .then(stream => {
                    const reader = stream.getReader();
                    return readStream(reader, queue, appendNextChunk, sourceBuffer, loading);
                })
                .catch(error => {
                    console.error('Error fetching audio response:', error);
                    loading.style.display = 'none';
                });
        });
    }

    function readStream(reader, queue, appendNextChunk, sourceBuffer, loading) {
        function processResult() {
            reader.read().then(({ done, value }) => {
                if (done) {
                    sourceBuffer.abort();
                    loading.style.display = 'none';
                    return;
                }
                if (value && value.byteLength > 0) {
                    queue.push(value);
                    appendNextChunk();
                }
                processResult();
            }).catch(error => {
                console.error('Error reading stream:', error);
                loading.style.display = 'none';
            });
        }
        processResult();
    }

    // 添加消息到历史记录
    function addToHistory(type, content) {
        const historyDiv = document.getElementById('interactionHistory');
        const messageDiv = document.createElement('div');

        if (type === 'user') {
            messageDiv.className = 'user-message';
            messageDiv.textContent = `用户: ${content}`;
        } else if (type === 'system') {
            messageDiv.className = 'system-message';
            messageDiv.textContent = `系统: ${content}`;
        }

        historyDiv.appendChild(messageDiv);
        historyDiv.scrollTop = historyDiv.scrollHeight;
    }
</script>
</body>
</html>