// 学伴录音功能核心逻辑
// 模型配置

// 录音相关变量
let mediaRecorder; let audioChunks = []; let isRecording = false;
// 音频播放相关变量
let audioElement = null; let isPlaying = false;

// 获取URL参数
function getUrlParam(name) {
    const reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)');
    const r = window.location.search.substr(1).match(reg);
    return r ? unescape(r[2]) : null;
}

// 开始录音
function startRecording() {
    if (isRecording) return;

    console.log("尝试开始录音");
    navigator.mediaDevices.getUserMedia({ audio: true })
        .then(stream => {
            mediaRecorder = new MediaRecorder(stream);
            audioChunks = [];

            mediaRecorder.ondataavailable = event => {
                if (event.data.size > 0) audioChunks.push(event.data);
            };

            mediaRecorder.onstop = () => {
                const audioBlob = new Blob(audioChunks, { type: 'audio/wav' });
                console.log("录音完成，音频数据大小:", audioBlob.size);
                uploadAudioToServer(audioBlob);
            };

            mediaRecorder.start();
            isRecording = true;
            document.getElementById('recordingIndicator').style.display = 'flex';
            document.getElementById('startRecordBtn').style.display = 'none';
            document.getElementById('stopRecordBtn').style.display = 'flex';
            console.log("开始录音成功");

            // 设置最长录音时间为60秒
            setTimeout(stopRecording, 60000);
        })
        .catch(error => {
            console.error("获取麦克风权限失败:", error);
            alert("请授权麦克风权限以使用录音功能");
        });
}

// 停止录音
function stopRecording() {
    if (!isRecording || !mediaRecorder) return;

    mediaRecorder.stop();
    isRecording = false;
    document.getElementById('recordingIndicator').style.display = 'none';
    document.getElementById('startRecordBtn').style.display = 'flex';
    document.getElementById('stopRecordBtn').style.display = 'none';
    console.log("停止录音");

    if (mediaRecorder.stream) {
        mediaRecorder.stream.getTracks().forEach(track => track.stop());
    }
}

// 上传音频到服务器
function uploadAudioToServer(audioBlob) {
    console.log("开始上传音频到服务器");
    document.getElementById('thinkingIndicator').style.display = 'flex';
    
    const formData = new FormData();
    formData.append('file', audioBlob, 'recording.wav');

    fetch('/api/xueban/upload-audio', {
        method: 'POST',
        body: formData
    })
    .then(response => {
        if (!response.ok) throw new Error('服务器响应错误');
        return response.json();
    })
    .then(data => {
        console.log("处理结果:", data);
        document.getElementById('thinkingIndicator').style.display = 'none';
        
        if (data.success) {
            showResults(data.data);
        } else {
            alert('音频处理失败: ' + data.message);
        }
    })
    .catch(error => {
        console.error("上传音频失败:", error);
        document.getElementById('thinkingIndicator').style.display = 'none';
        alert('上传音频失败: ' + error.message);
    });
}

// 显示ASR识别结果和反馈
function showResults(data) {
    const resultContainer = document.getElementById('resultContainer');
    resultContainer.style.display = 'flex';

    document.getElementById('asrResultText').textContent = data.asr_text || '未识别到内容';
    document.getElementById('feedbackResultText').textContent = data.feedback_text || '无反馈内容';

    if (data.audio_url) {
        if (audioElement) audioElement.pause();
        audioElement = new Audio(data.audio_url);
        audioElement.onloadedmetadata = function() {
            updateAudioTimeDisplay();
            try { audioElement.play(); isPlaying = true; updatePlayButton(); }
            catch (e) { console.error("自动播放失败:", e); }
        };
        audioElement.ontimeupdate = function() { updateAudioProgress(); updateAudioTimeDisplay(); };
        audioElement.onended = function() { isPlaying = false; updatePlayButton(); };
        document.getElementById('playAudioBtn').onclick = togglePlayAudio;
        document.getElementById('audioProgress').onclick = function(e) {
            const rect = this.getBoundingClientRect();
            audioElement.currentTime = (e.clientX - rect.left) / rect.width * audioElement.duration;
        };
    }
}

// 音频播放控制函数
function togglePlayAudio() {
    if (!audioElement) return;
    isPlaying ? audioElement.pause() : audioElement.play();
    isPlaying = !isPlaying;
    updatePlayButton();
}

function updatePlayButton() {
    const btn = document.getElementById('playAudioBtn');
    btn.innerHTML = isPlaying ? 
        '<svg width="20" height="20" viewBox="0 0 24 24" fill="none"><path d="M6 19H10V5H6V19ZM14 19H18V5H14V19Z" fill="white"/></svg>' : 
        '<svg width="20" height="20" viewBox="0 0 24 24" fill="none"><path d="M8 5V19L19 12L8 5Z" fill="white"/></svg>';
}

function updateAudioProgress() {
    if (!audioElement) return;
    const progress = (audioElement.currentTime / audioElement.duration) * 100;
    document.getElementById('progressBar').style.width = `${progress}%`;
}

function updateAudioTimeDisplay() {
    if (!audioElement) return;
    const format = s => `${Math.floor(s/60).toString().padStart(2,'0')}:${Math.floor(s%60).toString().padStart(2,'0')}`;
    document.getElementById('audioTime').textContent = `${format(audioElement.currentTime)} / ${format(audioElement.duration)}`;
}