let mediaRecorder;
let audioChunks = [];
let audioBlob;

// 获取DOM元素
const languageSelect = document.getElementById('language');
const textInput = document.getElementById('text');
const recordBtn = document.getElementById('recordBtn');
const stopBtn = document.getElementById('stopBtn');
const statusDiv = document.getElementById('status');
const resultDiv = document.getElementById('result');
const resultContent = document.getElementById('resultContent');

// 语言切换时自动填充示例文本
// 移除语言切换事件监听
// languageSelect.addEventListener('change', () => {
//     if (languageSelect.value === 'chinese') {
//         textInput.value = '窗前明月光，疑是地上霜。';
//     } else {
//         textInput.value = 'Nice to meet you.';
//     }
// });

// 移除页面加载事件监听
// window.addEventListener('load', () => {
//     textInput.value = '窗前明月光，疑是地上霜。';
//     stopBtn.disabled = true;
// });

// 开始录音
recordBtn.addEventListener('click', async () => {
    try {
        statusDiv.textContent = '正在获取麦克风权限...';
        statusDiv.className = 'status';

        // 获取麦克风权限并处理可能的错误
        const stream = await navigator.mediaDevices.getUserMedia({ audio: true })
            .catch(err => {
                if (err.name === 'NotAllowedError') {
                    throw new Error('用户拒绝了麦克风访问权限。请在浏览器设置中允许麦克风访问，或刷新页面重试。');
                } else if (err.name === 'NotFoundError') {
                    throw new Error('未检测到麦克风设备，请确保您的设备已正确连接麦克风。');
                } else if (err.name === 'NotReadableError') {
                    throw new Error('麦克风设备正在被其他程序占用，请关闭其他可能使用麦克风的程序后重试。');
                } else {
                    throw err;
                }
            });

        // 检测浏览器支持的录制格式
        const getSupportedMimeType = () => {
            const options = [
                'audio/webm; codecs=opus',
                'audio/webm',
                'audio/mp4',
                ''  // 空字符串表示使用浏览器默认格式
            ];
            for (const option of options) {
                if (MediaRecorder.isTypeSupported(option)) return option;
            }
            return '';
        };
        
        // 使用检测到的格式初始化
        mediaRecorder = new MediaRecorder(stream, {
            mimeType: getSupportedMimeType(),
            audioBitsPerSecond: 16000
        });
        
        // 同时修正Blob类型（确保前后一致）
        mediaRecorder.onstop = () => {
            audioBlob = new Blob(audioChunks, { type: 'audio/webm' });  // 与录制格式匹配
            statusDiv.textContent = '录音完成，正在自动提交评测...';
            submitEvaluation();
            // 停止所有音轨以释放麦克风
            stream.getTracks().forEach(track => track.stop());
        };

        // 设置60秒自动停止录音
        const maxRecordingTime = 60000; // 60秒
        const timeoutId = setTimeout(() => {
            if (mediaRecorder && mediaRecorder.state === 'recording') {
                alert('已达到最大录音时长（60秒）');
                mediaRecorder.stop();
                recordBtn.disabled = false;
                stopBtn.disabled = true;
            }
        }, maxRecordingTime);

        mediaRecorder.start();
        statusDiv.textContent = '正在录音...（最多60秒）';
        recordBtn.disabled = true;
        stopBtn.disabled = false;

    } catch (error) {
        console.error('录音初始化失败:', error);
        alert('录音失败: ' + error.message);
        statusDiv.textContent = '录音失败: ' + error.message;
        statusDiv.className = 'status error';
        recordBtn.disabled = false;
        stopBtn.disabled = true;
    }
});

// 停止录音
stopBtn.addEventListener('click', () => {
    if (mediaRecorder && mediaRecorder.state === 'recording') {
        mediaRecorder.stop();
        recordBtn.disabled = false;
        stopBtn.disabled = true;
    }
});

// 提交评测
async function submitEvaluation() {
    if (!audioBlob) {
        statusDiv.textContent = '请先完成录音';
        statusDiv.className = 'status error';
        return;
    }

    // 移除文本验证
    // if (!textInput.value.trim()) {
    //     statusDiv.textContent = '请输入评测文本内容';
    //     statusDiv.className = 'status error';
    //     return;
    // }

    try {
        statusDiv.textContent = '正在提交评测...';
        statusDiv.className = 'status';

        const formData = new FormData();
        formData.append('audio_file', audioBlob, 'recording.webm');
        formData.append('language', languageSelect.value);
        // 移除文本参数
        // formData.append('text', textInput.value.trim());
        formData.append('group', 'adult');
        formData.append('check_type', 'common');
        formData.append('grade', 'middle');

        const response = await fetch('/api/xunFei/evaluate-audio', {
            method: 'POST',
            body: formData
        });

        if (!response.ok) {
            throw new Error(`服务器错误: HTTP状态码 ${response.status}`);
        }

        const result = await response.json();

        if (result.status === 'success') {
            displayResults(result.results);
            statusDiv.textContent = '评测成功完成';
            statusDiv.className = 'status success';
        } else {
            throw new Error(result.error_message || '评测失败，服务器返回未知错误');
        }

    } catch (error) {
        console.error('评测提交失败:', error);
        statusDiv.textContent = '评测失败: ' + error.message;
        statusDiv.className = 'status error';
    }
}

// 显示评测结果
function displayResults(results) {
    resultDiv.style.display = 'block';

    if (!results) {
        resultContent.innerHTML = '<p>暂无评测结果</p>';
        return;
    }

    let html = '<div class="result-summary">';

    // 显示总分
    if (results.total_score !== undefined) {
        html += `<p><strong>总分:</strong> ${results.total_score.toFixed(4)} / 5.0</p>`;
    }

    // 显示各项评分
    if (results.accuracy_score !== undefined) {
        html += `<p><strong>准确度:</strong> ${results.accuracy_score.toFixed(4)}</p>`;
    }
    // 添加结果对象有效性检查
    if (!results) {
        showError("评测结果格式错误");
        return;
    }
    
    if (results.fluency_score !== undefined) {
        html += `<p><strong>流利度:</strong> ${results.fluency_score.toFixed(4)}</p>`;
    } else {
        html += `<p><strong>流利度:</strong> 未获取</p>`; // 添加默认值
    }
    
    if (results.completeness_score !== undefined) {
        html += `<p><strong>完整度:</strong> ${results.completeness_score.toFixed(4)}</p>`;
    } else {
        html += `<p><strong>完整度:</strong> 未获取</p>`; // 添加默认值
    }
    
    html += '</div>';

    // 显示单词级评分
    if (results.words && results.words.length > 0) {
        html += '<div class="word-scores"><h4>单词评分:</h4><ul>';
        results.words.forEach(word => {
            // 为单词评分添加空值检查
            const score = word.score !== undefined ? word.score.toFixed(4) : '无';
            html += `<li>${word.content}: ${score}</li>`;
        });
        html += '</ul></div>';
    }

    resultContent.innerHTML = html;
}