/**
 * SarcoAdvisor-BSU 前端交互脚本
 * 处理用户输入、API调用和结果显示
 */

// 全局变量
let currentAssessment = null;
let currentLanguage = 'zh'; // 默认中文

// DOM加载完成后初始化
document.addEventListener('DOMContentLoaded', function() {
    console.log('SarcoAdvisor-BSU 前端已加载');
    
    // 初始化表单
    initializeForm();
    
    // 检查系统健康状态
    checkSystemHealth();
    
    // 添加输入验证
    addInputValidation();
    
    // 初始化语言
    initializeLanguage();
    
    // 初始化自动计算
    initializeAutoCalculation();
    
    // 初始化PAQ问卷逻辑
    initializePAQLogic();
});

/**
 * 初始化表单
 */
function initializeForm() {
    const form = document.getElementById('assessmentForm');
    const submitBtn = document.getElementById('submitBtn');
    
    // 添加表单提交事件监听
    form.addEventListener('submit', handleFormSubmit);
    
    // 添加实时验证
    const inputs = form.querySelectorAll('input[required], select[required]');
    inputs.forEach(input => {
        input.addEventListener('blur', validateInput);
        input.addEventListener('input', updateSubmitButton);
    });
    
    console.log('表单初始化完成');
}

/**
 * 检查系统健康状态
 */
async function checkSystemHealth() {
    try {
        const response = await fetch('/health');
        const health = await response.json();
        
        if (health.status === 'healthy') {
            console.log('系统状态正常:', health);
        } else {
            console.warn('系统状态异常:', health);
            const warningMsg = currentLanguage === 'zh' ?
                '系统部分功能可能不可用，但基础评估功能正常' :
                'Some system functions may be unavailable, but basic assessment functions are normal';
            showAlert(warningMsg, 'warning');
        }
    } catch (error) {
        console.error('健康检查失败:', error);
        const errorMsg = currentLanguage === 'zh' ?
            '无法连接到服务器，请稍后重试' :
            'Unable to connect to server, please try again later';
        showAlert(errorMsg, 'danger');
    }
}

/**
 * 处理表单提交
 */
async function handleFormSubmit(event) {
    event.preventDefault();
    
    console.log('开始处理表单提交');
    
    // 验证表单
    if (!validateForm()) {
        return;
    }
    
    // 收集表单数据
    const formData = collectFormData();
    
    // 显示加载状态
    showLoading();
    
    try {
        // 调用完整评估API
        const result = await performFullAssessment(formData);
        
        // 显示结果
        displayResults(result);
        
        // 保存当前评估
        currentAssessment = result;
        
    } catch (error) {
        console.error('评估失败:', error);
        hideLoading();
        
        // 显示详细错误信息
        let errorMessage = currentLanguage === 'zh' ? '评估过程中出现错误' : 'An error occurred during assessment';
        if (error.message) {
            errorMessage += currentLanguage === 'zh' ? '：' + error.message : ': ' + error.message;
        }
        errorMessage += currentLanguage === 'zh' ? '。请检查输入数据后重试。' : '. Please check your input data and try again.';
        
        showAlert(errorMessage, 'danger');
        
        // 同时在控制台输出用户数据用于调试
        console.error('失败的用户数据:', formData);
    }
}

/**
 * 验证表单
 */
function validateForm() {
    const form = document.getElementById('assessmentForm');
    const inputs = form.querySelectorAll('input[required], select[required]');
    let isValid = true;
    
    inputs.forEach(input => {
        if (!validateInput({ target: input })) {
            isValid = false;
        }
    });
    
    return isValid;
}

/**
 * 验证单个输入
 */
function validateInput(event) {
    const input = event.target;
    const value = input.value;
    const type = input.type;
    const min = parseFloat(input.min);
    const max = parseFloat(input.max);
    
    let isValid = true;
    let errorMessage = '';
    
    // 必填验证
    if (input.required && !value) {
        isValid = false;
        errorMessage = currentLanguage === 'zh' ? '此字段为必填项' : 'This field is required';
    }

    // 数值范围验证
    if (type === 'number' && value) {
        const numValue = parseFloat(value);
        if (isNaN(numValue)) {
            isValid = false;
            errorMessage = currentLanguage === 'zh' ? '请输入有效数字' : 'Please enter a valid number';
        } else if (!isNaN(min) && numValue < min) {
            isValid = false;
            errorMessage = currentLanguage === 'zh' ? `值不能小于 ${min}` : `Value cannot be less than ${min}`;
        } else if (!isNaN(max) && numValue > max) {
            isValid = false;
            errorMessage = currentLanguage === 'zh' ? `值不能大于 ${max}` : `Value cannot be greater than ${max}`;
        }
    }
    
    // 显示验证结果
    showInputValidation(input, isValid, errorMessage);
    
    return isValid;
}

/**
 * 显示输入验证结果
 */
function showInputValidation(input, isValid, errorMessage) {
    // 移除旧的验证状态
    input.classList.remove('is-valid', 'is-invalid');
    
    // 移除旧的错误信息
    const oldFeedback = input.parentNode.querySelector('.invalid-feedback');
    if (oldFeedback) {
        oldFeedback.remove();
    }
    
    if (!isValid && errorMessage) {
        // 添加错误状态
        input.classList.add('is-invalid');
        
        // 添加错误信息
        const feedback = document.createElement('div');
        feedback.className = 'invalid-feedback';
        feedback.textContent = errorMessage;
        input.parentNode.appendChild(feedback);
    } else if (input.value) {
        // 添加成功状态
        input.classList.add('is-valid');
    }
}

/**
 * 更新提交按钮状态
 */
function updateSubmitButton() {
    const form = document.getElementById('assessmentForm');
    const submitBtn = document.getElementById('submitBtn');
    const requiredInputs = form.querySelectorAll('input[required], select[required]');
    
    let allValid = true;
    requiredInputs.forEach(input => {
        if (!input.value || input.classList.contains('is-invalid')) {
            allValid = false;
        }
    });
    
    submitBtn.disabled = !allValid;
}

/**
 * 收集表单数据并计算衍生特征
 */
function collectFormData() {
    const rawData = {};
    const form = document.getElementById('assessmentForm');
    const formElements = form.elements;
    
    // 收集原始表单数据
    for (let element of formElements) {
        if (element.name) {
            let value = element.value;
            
            // 处理空值
            if (value === '' || value === null || value === undefined) {
                // 为必填字段提供默认值
                if (element.hasAttribute('required')) {
                    if (element.name === 'arthritis' || element.name === 'diabetes') {
                        value = '0'; // 默认无疾病史
                    } else if (element.type === 'select-one' && element.name.startsWith('PAQ')) {
                        value = '2'; // PAQ问题默认选择"否"
                    }
                }
            }
            
            if (value !== '' && value !== null && value !== undefined) {
                // 转换数字类型
                if (element.type === 'number') {
                    value = parseFloat(value);
                } else if (element.type === 'select-one') {
                    value = parseInt(value);
                }
                
                rawData[element.name] = value;
            }
        }
    }
    
    // 确保BMI和WWI有值（从自动计算获取）
    if (!rawData.body_mass_index) {
        const height = parseFloat(document.getElementById('height').value);
        const weight = parseFloat(document.getElementById('weight').value);
        if (height && weight) {
            const heightInMeters = height / 100;
            rawData.body_mass_index = parseFloat((weight / (heightInMeters * heightInMeters)).toFixed(1));
        }
    }
    
    if (!rawData.WWI) {
        const waist = parseFloat(document.getElementById('waist').value);
        const weight = parseFloat(document.getElementById('weight').value);
        if (waist && weight) {
            rawData.WWI = parseFloat((waist / Math.sqrt(weight)).toFixed(2));
        }
    }
    
    // 确保所有PAQ字段都有默认值（避免Pydantic验证错误）
    const requiredPAQFields = {
        // 必需的选择字段
        'PAQ605': 2, 'PAQ620': 2, 'PAQ635': 2, 'PAQ650': 2, 'PAQ665': 2,
        // 可选的天数字段（默认0）
        'PAQ610': 0, 'PAQ625': 0, 'PAQ640': 0, 'PAQ655': 0, 'PAQ670': 0,
        // 可选的时长字段（默认0）
        'PAD615': 0, 'PAD630': 0, 'PAD645': 0, 'PAD660': 0, 'PAD675': 0,
        // 久坐时间（默认8小时）
        'PAD680': 480,
        // 医疗史字段（默认否）
        'arthritis': 0, 'diabetes': 0
    };
    
    // 为缺失的字段设置默认值
    for (const [field, defaultValue] of Object.entries(requiredPAQFields)) {
        if (!(field in rawData)) {
            rawData[field] = defaultValue;
        }
    }
    
    // 使用PAD680作为sedentary_minutes
    rawData.sedentary_minutes = rawData.PAD680 || 480;
    
    // 计算衍生特征
    const derivedFeatures = calculateDerivedFeatures(rawData);
    
    // 合并原始数据和衍生特征
    const formData = { ...rawData, ...derivedFeatures };
    
    console.log('收集的表单数据（含默认值）:', formData);
    return formData;
}

/**
 * 根据NHANES PAQ数据计算衍生特征
 * 完全按照create_pa_derived_features.py的逻辑实现
 */
function calculateDerivedFeatures(data) {
    const derived = {};
    
    // =====================================================
    // A. 活动总量/剂量特征 (Activity Volume/Dose)
    // =====================================================
    
    // A1. 每周总MET-分钟 (Total MET-minutes/week)
    const vigorousWorkMETs = 8.0 * (data.PAD615 || 0) * (data.PAQ610 || 0);
    const moderateWorkMETs = 4.0 * (data.PAD630 || 0) * (data.PAQ625 || 0);
    const transportationMETs = 4.0 * (data.PAD645 || 0) * (data.PAQ640 || 0);
    const vigorousRecMETs = 8.0 * (data.PAD660 || 0) * (data.PAQ655 || 0);
    const moderateRecMETs = 4.0 * (data.PAD675 || 0) * (data.PAQ670 || 0);
    
    const totalMETMinutesWeek = vigorousWorkMETs + moderateWorkMETs + transportationMETs + vigorousRecMETs + moderateRecMETs;
    
    // A2. 每周高强度活动总分钟数 (Total Vigorous Minutes/week)
    const vigorousWorkMins = (data.PAD615 || 0) * (data.PAQ610 || 0);
    const vigorousRecMins = (data.PAD660 || 0) * (data.PAQ655 || 0);
    const totalVigorousMinutesWeek = vigorousWorkMins + vigorousRecMins;
    
    // A3. 每周中等强度活动总分钟数 (Total Moderate Minutes/week)
    const moderateWorkMins = (data.PAD630 || 0) * (data.PAQ625 || 0);
    const transportationMins = (data.PAD645 || 0) * (data.PAQ640 || 0);
    const moderateRecMins = (data.PAD675 || 0) * (data.PAQ670 || 0);
    const totalModerateMinutesWeek = moderateWorkMins + transportationMins + moderateRecMins;
    
    // =====================================================
    // B. 活动模式/行为特征 (Activity Pattern/Behavior)  
    // =====================================================
    
    // B1. 平均每次高强度活动时长
    const totalVigorousDays = (data.PAQ610 || 0) + (data.PAQ655 || 0);
    const avgVigorousDurationPerBout = totalVigorousDays > 0 ? totalVigorousMinutesWeek / totalVigorousDays : 0;
    
    // B2. 平均每次中等强度活动时长
    const totalModerateDays = (data.PAQ625 || 0) + (data.PAQ640 || 0) + (data.PAQ670 || 0);
    const avgModerateDurationPerBout = totalModerateDays > 0 ? totalModerateMinutesWeek / totalModerateDays : 0;
    
    // B3. 活动多样性指数
    let activityDiversityIndex = 0;
    if ((data.PAQ605 || 0) > 0) activityDiversityIndex++; // 工作高强度
    if ((data.PAQ620 || 0) > 0) activityDiversityIndex++; // 工作中等强度
    if ((data.PAQ635 || 0) > 0) activityDiversityIndex++; // 交通活动
    if ((data.PAQ650 || 0) > 0) activityDiversityIndex++; // 休闲高强度
    if ((data.PAQ665 || 0) > 0) activityDiversityIndex++; // 休闲中等强度
    
    // =====================================================
    // C. 活动比例/构成特征 (Activity Ratio/Composition)
    // =====================================================
    
    // C1. 高强度活动MET-分钟占比
    const vigorousMETTotal = vigorousWorkMETs + vigorousRecMETs;
    const vigorousMETRatio = totalMETMinutesWeek > 0 ? vigorousMETTotal / totalMETMinutesWeek : 0;
    
    // C2. 活动/久坐比
    const totalActiveMinutesWeek = totalVigorousMinutesWeek + totalModerateMinutesWeek;
    const totalSedentaryMinutesWeek = (data.sedentary_minutes || data.PAD680 || 480) * 7; // 每日久坐 × 7天
    const activitySedentaryRatio = totalSedentaryMinutesWeek > 0 ? totalActiveMinutesWeek / totalSedentaryMinutesWeek : 0;
    
    // =====================================================
    // D. 指南达标特征 (Guideline Adherence)
    // =====================================================
    
    // D1. 每周中等强度等效总分钟数
    const totalModerateEquivalentMinutes = totalModerateMinutesWeek + (2 * totalVigorousMinutesWeek);
    
    // D2. 是否达到WHO体力活动推荐量
    const guidelineAdherenceBinary = totalModerateEquivalentMinutes >= 150 ? 1 : 0;
    
    // D3. 体力活动水平分级
    let activityLevelCategorical;
    if (totalModerateEquivalentMinutes >= 300) {
        activityLevelCategorical = 3; // 非常活跃
    } else if (totalModerateEquivalentMinutes >= 150) {
        activityLevelCategorical = 2; // 活跃
    } else if (totalModerateEquivalentMinutes > 0) {
        activityLevelCategorical = 1; // 低度活跃
    } else {
        activityLevelCategorical = 0; // 不活跃
    }
    
    // =====================================================
    // 整理最终衍生特征
    // =====================================================
    
    // A. 活动总量/剂量特征
    derived.Total_MET_minutes_week = parseFloat(totalMETMinutesWeek.toFixed(2));
    derived.Total_Vigorous_Minutes_week = parseFloat(totalVigorousMinutesWeek.toFixed(2));
    derived.Total_Moderate_Minutes_week = parseFloat(totalModerateMinutesWeek.toFixed(2));
    
    // B. 活动模式/行为特征
    derived.Avg_Vigorous_Duration_Per_Bout = parseFloat(avgVigorousDurationPerBout.toFixed(2));
    derived.Avg_Moderate_Duration_Per_Bout = parseFloat(avgModerateDurationPerBout.toFixed(2));
    derived.Activity_Diversity_Index = activityDiversityIndex;
    
    // C. 活动比例/构成特征
    derived.Vigorous_MET_Ratio = parseFloat(vigorousMETRatio.toFixed(3));
    derived.Activity_Sedentary_Ratio = parseFloat(activitySedentaryRatio.toFixed(3));
    
    // D. 指南达标特征
    derived.Total_Moderate_Equivalent_Minutes = parseFloat(totalModerateEquivalentMinutes.toFixed(2));
    derived.Guideline_Adherence_Binary = guidelineAdherenceBinary;
    derived.Activity_Level_Categorical = activityLevelCategorical;
    
    console.log('NHANES PAQ原始数据:', {
        PAQ610: data.PAQ610, PAD615: data.PAD615,
        PAQ625: data.PAQ625, PAD630: data.PAD630,
        PAQ640: data.PAQ640, PAD645: data.PAD645,
        PAQ655: data.PAQ655, PAD660: data.PAD660,
        PAQ670: data.PAQ670, PAD675: data.PAD675,
        PAD680: data.PAD680
    });
    console.log('计算的中间值:', {vigorousWorkMETs, moderateWorkMETs, transportationMETs, vigorousRecMETs, moderateRecMETs});
    console.log('计算的时间总量:', {totalVigorousMinutesWeek, totalModerateMinutesWeek, totalActiveMinutesWeek});
    console.log('最终衍生特征:', derived);
    
    return derived;
}

/**
 * 执行完整评估
 */
async function performFullAssessment(userData) {
    console.log('开始完整评估...');
    
    const response = await fetch('/api/full_assessment', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
        },
        body: JSON.stringify(userData)
    });
    
    if (!response.ok) {
        let errorMessage = `HTTP ${response.status}: `;
        try {
            const errorData = await response.json();
            console.error('服务器错误详情:', errorData);
            
            if (response.status === 422 && errorData.detail) {
                // 处理数据验证错误
                if (Array.isArray(errorData.detail)) {
                    const validationErrors = errorData.detail.map(err => 
                        `字段"${err.loc.join('.')}"错误: ${err.msg}`
                    ).join('; ');
                    errorMessage += validationErrors;
                } else {
                    errorMessage += JSON.stringify(errorData.detail);
                }
            } else {
                errorMessage += errorData.detail || JSON.stringify(errorData);
            }
        } catch (parseError) {
            errorMessage += response.statusText || '服务器错误';
        }
        throw new Error(errorMessage);
    }
    
    const result = await response.json();
    console.log('评估结果:', result);
    
    return result;
}

/**
 * 显示加载状态
 */
function showLoading() {
    document.getElementById('loadingSection').style.display = 'block';
    document.getElementById('resultsSection').style.display = 'none';
    
    // 滚动到加载区域
    document.getElementById('loadingSection').scrollIntoView({ 
        behavior: 'smooth' 
    });
}

/**
 * 隐藏加载状态
 */
function hideLoading() {
    document.getElementById('loadingSection').style.display = 'none';
}

/**
 * 显示评估结果
 */
function displayResults(assessment) {
    hideLoading();
    
    const resultsSection = document.getElementById('resultsSection');
    const resultsContent = document.getElementById('resultsContent');
    
    // 构建结果HTML
    const html = buildResultsHTML(assessment);
    resultsContent.innerHTML = html;
    
    // 显示结果区域
    resultsSection.style.display = 'block';
    resultsSection.classList.add('fade-in-up');
    
    // 滚动到结果区域
    resultsSection.scrollIntoView({ 
        behavior: 'smooth' 
    });
    
    console.log('结果显示完成');
}

/**
 * 构建结果HTML
 */
function buildResultsHTML(assessment) {
    const screening = assessment.screening;
    const advisory = assessment.advisory;
    const explanation = assessment.risk_explanation;

    let html = `
        <!-- 风险评估结果 -->
        <div class="row mb-4">
            <div class="col-12">
                <h4 class="text-primary mb-3">
                    <i class="fas fa-chart-pie me-2"></i>
                    <span class="lang-zh">风险评估结果</span>
                    <span class="lang-en" style="display: none;">Risk Assessment Results</span>
                </h4>
            </div>
        </div>

        <div class="row mb-4">
            <!-- 综合风险 -->
            <div class="col-md-12 mb-3">
                <div class="risk-level risk-${screening.overall_risk}">
                    <i class="fas fa-heartbeat fa-2x mb-2"></i>
                    <div>
                        <span class="lang-zh">综合风险评估: ${getRiskLevelText(screening.overall_risk)}</span>
                        <span class="lang-en" style="display: none;">Overall Risk Assessment: ${getRiskLevelText(screening.overall_risk, 'en')}</span>
                    </div>
                    <small>
                        <span class="lang-zh">系统置信度: ${(screening.confidence * 100).toFixed(1)}%</span>
                        <span class="lang-en" style="display: none;">System Confidence: ${(screening.confidence * 100).toFixed(1)}%</span>
                    </small>
                </div>
            </div>
        </div>

        <!-- 详细模型结果 -->
        <div class="row mb-4">
            <div class="col-12">
                <h5 class="text-secondary mb-3">
                    <i class="fas fa-chart-bar me-2"></i>
                    <span class="lang-zh">详细评估结果</span>
                    <span class="lang-en" style="display: none;">Detailed Assessment Results</span>
                </h5>
            </div>
        </div>

        <!-- 筛查模型结果 -->
        <div class="row mb-3">
            <div class="col-12">
                <h6 class="text-info">
                    <i class="fas fa-search me-1"></i>
                    <span class="lang-zh">筛查阶段 (高召回率 - 不漏诊)</span>
                    <span class="lang-en" style="display: none;">Screening Stage (High Recall - No Missed Diagnosis)</span>
                </h6>
            </div>
        </div>
        <div class="row mb-4">
            <!-- SarcoI筛查 -->
            <div class="col-md-6 mb-3">
                <div class="card border-info bg-light">
                    <div class="card-body text-center">
                        <div class="risk-level risk-${screening.sarcoI_risk} mb-2">
                            <i class="fas fa-user-injured fa-lg mb-1"></i>
                            <div>
                                <strong>
                                    <span class="lang-zh">SarcoI 筛查</span>
                                    <span class="lang-en" style="display: none;">SarcoI Screening</span>
                                </strong>
                            </div>
                            <div class="small">
                                <span class="lang-zh">RandomForest 模型</span>
                                <span class="lang-en" style="display: none;">RandomForest Model</span>
                            </div>
                        </div>
                        <div class="text-muted">
                            <div>
                                <span class="lang-zh">风险等级: <strong>${getRiskLevelText(screening.sarcoI_risk)}</strong></span>
                                <span class="lang-en" style="display: none;">Risk Level: <strong>${getRiskLevelText(screening.sarcoI_risk, 'en')}</strong></span>
                            </div>
                            <div>
                                <span class="lang-zh">肌少症特征相似度: <strong>${(screening.sarcoI_probability * 100).toFixed(1)}%</strong> (筛查阈值: 50%)</span>
                                <span class="lang-en" style="display: none;">Sarcopenia Feature Similarity: <strong>${(screening.sarcoI_probability * 100).toFixed(1)}%</strong> (Screening Threshold: 50%)</span>
                            </div>
                        </div>
                        <div class="mt-2 small text-info">
                            <div>Recall: <strong>91.14%</strong></div>
                            <div>Precision: <strong>43.05%</strong></div>
                        </div>
                    </div>
                </div>
            </div>

            <!-- SarcoII筛查 -->
            <div class="col-md-6 mb-3">
                <div class="card border-info bg-light">
                    <div class="card-body text-center">
                        <div class="risk-level risk-${screening.sarcoII_risk} mb-2">
                            <i class="fas fa-wheelchair fa-lg mb-1"></i>
                            <div>
                                <strong>
                                    <span class="lang-zh">SarcoII 筛查</span>
                                    <span class="lang-en" style="display: none;">SarcoII Screening</span>
                                </strong>
                            </div>
                            <div class="small">
                                <span class="lang-zh">CatBoost 模型</span>
                                <span class="lang-en" style="display: none;">CatBoost Model</span>
                            </div>
                        </div>
                        <div class="text-muted">
                            <div>
                                <span class="lang-zh">风险等级: <strong>${getRiskLevelText(screening.sarcoII_risk)}</strong></span>
                                <span class="lang-en" style="display: none;">Risk Level: <strong>${getRiskLevelText(screening.sarcoII_risk, 'en')}</strong></span>
                            </div>
                            <div>
                                <span class="lang-zh">肌少症特征相似度: <strong>${(screening.sarcoII_probability * 100).toFixed(1)}%</strong> (筛查阈值: 50%)</span>
                                <span class="lang-en" style="display: none;">Sarcopenia Feature Similarity: <strong>${(screening.sarcoII_probability * 100).toFixed(1)}%</strong> (Screening Threshold: 50%)</span>
                            </div>
                        </div>
                        <div class="mt-2 small text-info">
                            <div>Precision: <strong>25.48%</strong></div>
                            <div>Recall: <strong>89.83%</strong></div>
                        </div>
                    </div>
                </div>
            </div>
        </div>

        <!-- 建议模型结果 -->
        <!-- 建议模型部分 - 始终显示 -->
        <div class="row mb-3">
            <div class="col-12">
                <h6 class="text-success">
                    <i class="fas fa-lightbulb me-1"></i>
                    <span class="lang-zh">建议阶段 (高精确率 - 减少误诊)</span>
                    <span class="lang-en" style="display: none;">Advisory Stage (High Precision - Reduce Misdiagnosis)</span>
                </h6>
            </div>
        </div>
        <div class="row mb-4">
            <!-- SarcoI建议 -->
            <div class="col-md-6 mb-3">
                <div class="card border-success bg-light">
                    <div class="card-body text-center">
                        <div class="risk-level risk-${screening.sarcoI_advisory_risk} mb-2">
                            <i class="fas fa-user-injured fa-lg mb-1"></i>
                            <div>
                                <strong>
                                    <span class="lang-zh">SarcoI 建议</span>
                                    <span class="lang-en" style="display: none;">SarcoI Advisory</span>
                                </strong>
                            </div>
                            <div class="small">
                                <span class="lang-zh">CatBoost 模型</span>
                                <span class="lang-en" style="display: none;">CatBoost Model</span>
                            </div>
                        </div>
                        <div class="text-muted">
                            <div>
                                <span class="lang-zh">风险等级: <strong>${screening.sarcoI_advisory_risk ? getRiskLevelText(screening.sarcoI_advisory_risk) : '未评估'}</strong></span>
                                <span class="lang-en" style="display: none;">Risk Level: <strong>${screening.sarcoI_advisory_risk ? getRiskLevelText(screening.sarcoI_advisory_risk, 'en') : 'Not Assessed'}</strong></span>
                            </div>
                            <div>
                                <span class="lang-zh">肌少症特征相似度: <strong>${screening.sarcoI_advisory_probability ? (screening.sarcoI_advisory_probability * 100).toFixed(1) + '%' : 'N/A'}</strong> (建议阈值: 36%)</span>
                                <span class="lang-en" style="display: none;">Sarcopenia Feature Similarity: <strong>${screening.sarcoI_advisory_probability ? (screening.sarcoI_advisory_probability * 100).toFixed(1) + '%' : 'N/A'}</strong> (Advisory Threshold: 36%)</span>
                            </div>
                        </div>
                        <div class="mt-2 small text-success">
                            <div>
                                <span class="lang-zh">Precision: <strong>高精确率</strong></span>
                                <span class="lang-en" style="display: none;">Precision: <strong>High Precision</strong></span>
                            </div>
                            <div>
                                <span class="lang-zh">Recall: <strong>DiCE优化</strong></span>
                                <span class="lang-en" style="display: none;">Recall: <strong>DiCE Optimized</strong></span>
                            </div>
                        </div>
                    </div>
                </div>
            </div>

            <!-- SarcoII建议 -->
            <div class="col-md-6 mb-3">
                <div class="card border-success bg-light">
                    <div class="card-body text-center">
                        <div class="risk-level risk-${screening.sarcoII_advisory_risk} mb-2">
                            <i class="fas fa-wheelchair fa-lg mb-1"></i>
                            <div>
                                <strong>
                                    <span class="lang-zh">SarcoII 建议</span>
                                    <span class="lang-en" style="display: none;">SarcoII Advisory</span>
                                </strong>
                            </div>
                            <div class="small">
                                <span class="lang-zh">RandomForest 模型</span>
                                <span class="lang-en" style="display: none;">RandomForest Model</span>
                            </div>
                        </div>
                        <div class="text-muted">
                            <div>
                                <span class="lang-zh">风险等级: <strong>${screening.sarcoII_advisory_risk ? getRiskLevelText(screening.sarcoII_advisory_risk) : '未评估'}</strong></span>
                                <span class="lang-en" style="display: none;">Risk Level: <strong>${screening.sarcoII_advisory_risk ? getRiskLevelText(screening.sarcoII_advisory_risk, 'en') : 'Not Assessed'}</strong></span>
                            </div>
                            <div>
                                <span class="lang-zh">肌少症特征相似度: <strong>${screening.sarcoII_advisory_probability ? (screening.sarcoII_advisory_probability * 100).toFixed(1) + '%' : 'N/A'}</strong> (建议阈值: 52%)</span>
                                <span class="lang-en" style="display: none;">Sarcopenia Feature Similarity: <strong>${screening.sarcoII_advisory_probability ? (screening.sarcoII_advisory_probability * 100).toFixed(1) + '%' : 'N/A'}</strong> (Advisory Threshold: 52%)</span>
                            </div>
                        </div>
                        <div class="mt-2 small text-success">
                            <div>
                                <span class="lang-zh">Precision: <strong>高精确率</strong></span>
                                <span class="lang-en" style="display: none;">Precision: <strong>High Precision</strong></span>
                            </div>
                            <div>
                                <span class="lang-zh">Recall: <strong>DiCE优化</strong></span>
                                <span class="lang-en" style="display: none;">Recall: <strong>DiCE Optimized</strong></span>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>

        <!-- 风险解释 -->
        <div class="row mb-4">
            <div class="col-12">
                <div class="alert alert-info">
                    <h5 class="alert-heading">
                        <i class="fas fa-info-circle me-2"></i>${explanation.title}
                    </h5>
                    <p class="mb-2">${explanation.description}</p>
                    <hr>
                    <p class="mb-0">
                        <strong>
                            <span class="lang-zh">建议:</span>
                            <span class="lang-en" style="display: none;">Recommendation:</span>
                        </strong> ${explanation.recommendation}
                    </p>
                </div>
            </div>
        </div>
    `;

    // 如果有个性化建议，显示建议内容
    if (advisory && assessment.needs_advisory) {
        html += buildAdvisoryHTML(advisory);
    }

    // 添加处理时间信息
    html += `
        <div class="row mt-4">
            <div class="col-12">
                <small class="text-muted">
                    <i class="fas fa-clock me-1"></i>
                    <span class="lang-zh">评估耗时: ${assessment.total_processing_time.toFixed(2)} 秒</span>
                    <span class="lang-en" style="display: none;">Processing Time: ${assessment.total_processing_time.toFixed(2)} seconds</span>
                </small>
            </div>
        </div>
    `;

    return html;
}

/**
 * 构建建议HTML
 */
function buildAdvisoryHTML(advisory) {
    let html = `
        <div class="row mb-4">
            <div class="col-12">
                <h4 class="text-success mb-3">
                    <i class="fas fa-lightbulb me-2"></i>
                    <span class="lang-zh">个性化建议</span>
                    <span class="lang-en" style="display: none;">Personalized Recommendations</span>
                </h4>
            </div>
        </div>
    `;

    // 优先级行动
    if (advisory.priority_actions && advisory.priority_actions.length > 0) {
        html += `
            <div class="row mb-4">
                <div class="col-12">
                    <div class="alert alert-warning">
                        <h6 class="alert-heading">
                            <i class="fas fa-exclamation-triangle me-2"></i>
                            <span class="lang-zh">优先建议</span>
                            <span class="lang-en" style="display: none;">Priority Recommendations</span>
                        </h6>
                        <ul class="mb-0">
                            ${advisory.priority_actions.map(action => `<li>${action}</li>`).join('')}
                        </ul>
                    </div>
                </div>
            </div>
        `;
    }

    // SarcoI建议
    if (advisory.sarcoI_recommendations && advisory.sarcoI_recommendations.length > 0) {
        html += `
            <div class="row mb-3">
                <div class="col-12">
                    <h5 class="text-secondary">
                        <i class="fas fa-user-injured me-2"></i>
                        <span class="lang-zh">SarcoI相关建议</span>
                        <span class="lang-en" style="display: none;">SarcoI Related Recommendations</span>
                    </h5>
                </div>
            </div>
            <div class="row mb-4">
                ${advisory.sarcoI_recommendations.map(rec => buildRecommendationCard(rec)).join('')}
            </div>
        `;
    }

    // SarcoII建议
    if (advisory.sarcoII_recommendations && advisory.sarcoII_recommendations.length > 0) {
        html += `
            <div class="row mb-3">
                <div class="col-12">
                    <h5 class="text-secondary">
                        <i class="fas fa-wheelchair me-2"></i>
                        <span class="lang-zh">SarcoII相关建议</span>
                        <span class="lang-en" style="display: none;">SarcoII Related Recommendations</span>
                    </h5>
                </div>
            </div>
            <div class="row mb-4">
                ${advisory.sarcoII_recommendations.map(rec => buildRecommendationCard(rec)).join('')}
            </div>
        `;
    }

    // 目标指标
    if (advisory.target_metrics && Object.keys(advisory.target_metrics).length > 0) {
        html += `
            <div class="row mb-4">
                <div class="col-12">
                    <h5 class="text-secondary mb-3">
                        <i class="fas fa-target me-2"></i>
                        <span class="lang-zh">目标指标</span>
                        <span class="lang-en" style="display: none;">Target Metrics</span>
                    </h5>
                    <div class="row">
                        ${Object.entries(advisory.target_metrics).map(([key, value]) => `
                            <div class="col-md-6 mb-2">
                                <div class="d-flex justify-content-between">
                                    <span class="fw-bold">${key}:</span>
                                    <span class="text-primary">${value}</span>
                                </div>
                            </div>
                        `).join('')}
                    </div>
                </div>
            </div>
        `;
    }

    // 降级提示
    if (advisory.fallback_used) {
        html += `
            <div class="row mb-4">
                <div class="col-12">
                    <div class="alert alert-info">
                        <i class="fas fa-info-circle me-2"></i>
                        <span class="lang-zh">部分建议基于规则生成，建议咨询专业医生获取更详细的个性化指导。</span>
                        <span class="lang-en" style="display: none;">Some recommendations are rule-based. Please consult professional doctors for more detailed personalized guidance.</span>
                    </div>
                </div>
            </div>
        `;
    }

    return html;
}

/**
 * 构建单个建议卡片
 */
function buildRecommendationCard(recommendation) {
    // 获取优先级文本
    const getPriorityText = (priority, lang) => {
        const priorityTexts = {
            'zh': {
                'High': '高',
                'Medium': '中',
                'Low': '低'
            },
            'en': {
                'High': 'High',
                'Medium': 'Medium',
                'Low': 'Low'
            }
        };
        return priorityTexts[lang]?.[priority] || priority;
    };

    return `
        <div class="col-md-6 mb-3">
            <div class="recommendation-item">
                <div class="recommendation-title">
                    <i class="fas fa-arrow-right me-2 text-primary"></i>
                    ${recommendation.title}
                </div>
                <div class="recommendation-description">
                    ${recommendation.description}
                </div>
                ${recommendation.target_change ? `
                    <div class="text-muted small mb-2">
                        <i class="fas fa-target me-1"></i>
                        ${recommendation.target_change}
                    </div>
                ` : ''}
                <div class="recommendation-meta">
                    <span class="priority-badge priority-${recommendation.priority.toLowerCase()}">
                        <span class="lang-zh">${getPriorityText(recommendation.priority, 'zh')}优先级</span>
                        <span class="lang-en" style="display: none;">${getPriorityText(recommendation.priority, 'en')} Priority</span>
                    </span>
                    ${recommendation.expected_impact ? `
                        <small class="text-success">
                            <i class="fas fa-chart-line me-1"></i>
                            ${recommendation.expected_impact}
                        </small>
                    ` : ''}
                </div>
            </div>
        </div>
    `;
}

/**
 * 获取风险等级文本
 */
function getRiskLevelText(level, language = null) {
    const lang = language || currentLanguage;

    const levels = {
        'zh': {
            'low': '低风险',
            'medium': '中等风险',
            'high': '高风险'
        },
        'en': {
            'low': 'Low Risk',
            'medium': 'Medium Risk',
            'high': 'High Risk'
        }
    };

    return levels[lang]?.[level] || level;
}

/**
 * 显示警告信息
 */
function showAlert(message, type = 'info') {
    const alertHTML = `
        <div class="alert alert-${type} alert-dismissible fade show" role="alert">
            <i class="fas fa-${getAlertIcon(type)} me-2"></i>
            ${message}
            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
        </div>
    `;

    // 在表单上方插入警告
    const form = document.getElementById('assessmentForm');
    const alertContainer = document.createElement('div');
    alertContainer.innerHTML = alertHTML;
    form.parentNode.insertBefore(alertContainer, form);

    // 5秒后自动关闭
    setTimeout(() => {
        const alert = alertContainer.querySelector('.alert');
        if (alert) {
            alert.remove();
        }
    }, 5000);
}

/**
 * 获取警告图标
 */
function getAlertIcon(type) {
    const icons = {
        'info': 'info-circle',
        'warning': 'exclamation-triangle',
        'danger': 'exclamation-circle',
        'success': 'check-circle'
    };
    return icons[type] || 'info-circle';
}

/**
 * 添加输入验证
 */
function addInputValidation() {
    // 身高合理性检查
    const heightInput = document.getElementById('height');
    if (heightInput) {
        heightInput.addEventListener('input', function() {
            const height = parseFloat(this.value);
            if (height && (height < 120 || height > 220)) {
                const message = currentLanguage === 'zh' ? '身高数值请确认是否正确' : 'Please confirm if height value is correct';
                showInputWarning(this, message);
            } else {
                hideInputWarning(this);
            }
        });
    }
    
    // 体重合理性检查
    const weightInput = document.getElementById('weight');
    if (weightInput) {
        weightInput.addEventListener('input', function() {
            const weight = parseFloat(this.value);
            if (weight && (weight < 35 || weight > 150)) {
                const message = currentLanguage === 'zh' ? '体重数值请确认是否正确' : 'Please confirm if weight value is correct';
                showInputWarning(this, message);
            } else {
                hideInputWarning(this);
            }
        });
    }
    
    // 腰围合理性检查
    const waistInput = document.getElementById('waist');
    if (waistInput) {
        waistInput.addEventListener('input', function() {
            const waist = parseFloat(this.value);
            if (waist && (waist < 60 || waist > 150)) {
                const message = currentLanguage === 'zh' ? '腰围数值请确认是否正确' : 'Please confirm if waist circumference is correct';
                showInputWarning(this, message);
            } else {
                hideInputWarning(this);
            }
        });
    }
    
    // 年龄合理性检查
    const ageInput = document.getElementById('age_years');
    if (ageInput) {
        ageInput.addEventListener('input', function() {
            const age = parseFloat(this.value);
            if (age && age > 80) {
                const message = currentLanguage === 'zh' ? '高龄用户建议咨询专业医生' : 'Elderly users are advised to consult professional doctors';
                showInputWarning(this, message);
            } else {
                hideInputWarning(this);
            }
        });
    }
}

/**
 * 显示输入警告
 */
function showInputWarning(input, message) {
    let warning = input.parentNode.querySelector('.input-warning');
    if (!warning) {
        warning = document.createElement('div');
        warning.className = 'input-warning text-warning small mt-1';
        input.parentNode.appendChild(warning);
    }
    warning.innerHTML = `<i class="fas fa-exclamation-triangle me-1"></i>${message}`;
}

/**
 * 隐藏输入警告
 */
function hideInputWarning(input) {
    const warning = input.parentNode.querySelector('.input-warning');
    if (warning) {
        warning.remove();
    }
}

/**
 * 导出评估结果 (未来功能)
 */
function exportResults() {
    if (!currentAssessment) {
        const noResultMsg = currentLanguage === 'zh' ?
            '没有可导出的评估结果' :
            'No assessment results to export';
        showAlert(noResultMsg, 'warning');
        return;
    }

    // TODO: 实现结果导出功能
    console.log('导出评估结果:', currentAssessment);
    const devMsg = currentLanguage === 'zh' ?
        '导出功能正在开发中' :
        'Export function is under development';
    showAlert(devMsg, 'info');
}

/**
 * 初始化语言设置
 */
function initializeLanguage() {
    // 从localStorage读取语言设置
    const savedLang = localStorage.getItem('sarco-language');
    if (savedLang) {
        currentLanguage = savedLang;
        if (currentLanguage === 'en') {
            switchToEnglish();
        }
    }
}

/**
 * 切换语言
 */
function toggleLanguage() {
    if (currentLanguage === 'zh') {
        switchToEnglish();
    } else {
        switchToChinese();
    }
}

/**
 * 切换到英文
 */
function switchToEnglish() {
    currentLanguage = 'en';
    document.querySelectorAll('.lang-zh').forEach(el => el.style.display = 'none');
    document.querySelectorAll('.lang-en').forEach(el => el.style.display = 'inline');
    document.getElementById('langToggleText').textContent = '中文';
    document.documentElement.lang = 'en';
    document.title = 'SarcoAdvisor-BSU - Sarcopenia Risk Assessment System';

    // 更新select选项
    updateSelectOptions('en');

    // 如果有已显示的结果，重新渲染
    if (currentAssessment) {
        displayResults(currentAssessment);
    }

    // 保存设置
    localStorage.setItem('sarco-language', 'en');
}

/**
 * 切换到中文
 */
function switchToChinese() {
    currentLanguage = 'zh';
    document.querySelectorAll('.lang-en').forEach(el => el.style.display = 'none');
    document.querySelectorAll('.lang-zh').forEach(el => el.style.display = 'inline');
    document.getElementById('langToggleText').textContent = 'English';
    document.documentElement.lang = 'zh-CN';
    document.title = 'SarcoAdvisor-BSU - 肌少症风险评估系统';

    // 更新select选项
    updateSelectOptions('zh');

    // 如果有已显示的结果，重新渲染
    if (currentAssessment) {
        displayResults(currentAssessment);
    }

    // 保存设置
    localStorage.setItem('sarco-language', 'zh');
}

/**
 * 更新select选项的显示
 */
function updateSelectOptions(lang) {
    const select = document.getElementById('race_ethnicity');
    const options = select.querySelectorAll('option');
    
    options.forEach(option => {
        if (option.value === '') {
            option.textContent = lang === 'zh' ? '请选择' : 'Please select';
        } else if (option.value === '0') {
            option.textContent = lang === 'zh' ? '美洲原住民' : 'Native American';
        } else if (option.value === '1') {
            option.textContent = lang === 'zh' ? '亚洲人' : 'Asian';
        } else if (option.value === '2') {
            option.textContent = lang === 'zh' ? '非洲裔美国人' : 'African American';
        } else if (option.value === '3') {
            option.textContent = lang === 'zh' ? '西班牙裔' : 'Hispanic';
        } else if (option.value === '4') {
            option.textContent = lang === 'zh' ? '白人' : 'White';
        }
    });
}

/**
 * 初始化自动计算功能
 */
function initializeAutoCalculation() {
    // 获取输入元素
    const heightInput = document.getElementById('height');
    const weightInput = document.getElementById('weight');
    const waistInput = document.getElementById('waist');
    const bmiInput = document.getElementById('body_mass_index');
    const wwiInput = document.getElementById('WWI');
    
    // 添加事件监听器
    if (heightInput && weightInput && waistInput) {
        heightInput.addEventListener('input', calculateBMIAndWWI);
        weightInput.addEventListener('input', calculateBMIAndWWI);
        waistInput.addEventListener('input', calculateBMIAndWWI);
        
        console.log('自动计算功能已初始化');
    } else {
        console.warn('未找到身体测量输入字段');
    }
}

/**
 * 计算BMI和WWI
 */
function calculateBMIAndWWI() {
    const height = parseFloat(document.getElementById('height').value);
    const weight = parseFloat(document.getElementById('weight').value);
    const waist = parseFloat(document.getElementById('waist').value);
    
    const bmiInput = document.getElementById('body_mass_index');
    const wwiInput = document.getElementById('WWI');
    
    // 计算BMI
    if (height && weight && height > 0) {
        const heightInMeters = height / 100; // 转换为米
        const bmi = weight / (heightInMeters * heightInMeters);
        bmiInput.value = bmi.toFixed(1);
        
        // 添加BMI颜色指示
        updateBMIStatus(bmi);
    } else {
        bmiInput.value = '';
        bmiInput.className = 'form-control bg-light';
    }
    
    // 计算WWI
    if (waist && weight && weight > 0) {
        const wwi = waist / Math.sqrt(weight);
        wwiInput.value = wwi.toFixed(2);
        
        // 添加WWI颜色指示
        updateWWIStatus(wwi);
    } else {
        wwiInput.value = '';
        wwiInput.className = 'form-control bg-light';
    }
    
    // 触发表单验证更新
    updateSubmitButton();
}

/**
 * 更新BMI状态指示
 */
function updateBMIStatus(bmi) {
    const bmiInput = document.getElementById('body_mass_index');
    
    // 移除旧的状态类
    bmiInput.className = 'form-control bg-light';
    
    if (bmi < 18.5) {
        bmiInput.classList.add('border-info'); // 偏瘦
    } else if (bmi >= 18.5 && bmi < 24) {
        bmiInput.classList.add('border-success'); // 正常
    } else if (bmi >= 24 && bmi < 28) {
        bmiInput.classList.add('border-warning'); // 超重
    } else if (bmi >= 28) {
        bmiInput.classList.add('border-danger'); // 肥胖
    }
}

/**
 * 更新WWI状态指示
 */
function updateWWIStatus(wwi) {
    const wwiInput = document.getElementById('WWI');
    
    // 移除旧的状态类
    wwiInput.className = 'form-control bg-light';
    
    // WWI正常范围大约在9-12之间
    if (wwi < 9) {
        wwiInput.classList.add('border-info'); // 较低
    } else if (wwi >= 9 && wwi <= 12) {
        wwiInput.classList.add('border-success'); // 正常
    } else if (wwi > 12 && wwi <= 14) {
        wwiInput.classList.add('border-warning'); // 较高
    } else if (wwi > 14) {
        wwiInput.classList.add('border-danger'); // 很高
    }
}

/**
 * 初始化PAQ问卷条件显示逻辑
 */
function initializePAQLogic() {
    // 工作高强度活动条件显示
    const paq605 = document.getElementById('PAQ605');
    const vigorousWorkDetails = document.getElementById('vigorous_work_details');
    
    if (paq605 && vigorousWorkDetails) {
        paq605.addEventListener('change', function() {
            if (this.value === '1') {
                vigorousWorkDetails.style.display = 'block';
                document.getElementById('PAQ610').required = true;
                document.getElementById('PAD615').required = true;
            } else {
                vigorousWorkDetails.style.display = 'none';
                document.getElementById('PAQ610').required = false;
                document.getElementById('PAD615').required = false;
                document.getElementById('PAQ610').value = '';
                document.getElementById('PAD615').value = '';
            }
        });
    }
    
    // 工作中等强度活动条件显示
    const paq620 = document.getElementById('PAQ620');
    const moderateWorkDetails = document.getElementById('moderate_work_details');
    
    if (paq620 && moderateWorkDetails) {
        paq620.addEventListener('change', function() {
            if (this.value === '1') {
                moderateWorkDetails.style.display = 'block';
                document.getElementById('PAQ625').required = true;
                document.getElementById('PAD630').required = true;
            } else {
                moderateWorkDetails.style.display = 'none';
                document.getElementById('PAQ625').required = false;
                document.getElementById('PAD630').required = false;
                document.getElementById('PAQ625').value = '';
                document.getElementById('PAD630').value = '';
            }
        });
    }
    
    // 交通活动条件显示
    const paq635 = document.getElementById('PAQ635');
    const transportDetails = document.getElementById('transport_details');
    
    if (paq635 && transportDetails) {
        paq635.addEventListener('change', function() {
            if (this.value === '1') {
                transportDetails.style.display = 'block';
                document.getElementById('PAQ640').required = true;
                document.getElementById('PAD645').required = true;
            } else {
                transportDetails.style.display = 'none';
                document.getElementById('PAQ640').required = false;
                document.getElementById('PAD645').required = false;
                document.getElementById('PAQ640').value = '';
                document.getElementById('PAD645').value = '';
            }
        });
    }
    
    // 休闲高强度活动条件显示
    const paq650 = document.getElementById('PAQ650');
    const vigorousRecDetails = document.getElementById('vigorous_rec_details');
    
    if (paq650 && vigorousRecDetails) {
        paq650.addEventListener('change', function() {
            if (this.value === '1') {
                vigorousRecDetails.style.display = 'block';
                document.getElementById('PAQ655').required = true;
                document.getElementById('PAD660').required = true;
            } else {
                vigorousRecDetails.style.display = 'none';
                document.getElementById('PAQ655').required = false;
                document.getElementById('PAD660').required = false;
                document.getElementById('PAQ655').value = '';
                document.getElementById('PAD660').value = '';
            }
        });
    }
    
    // 休闲中等强度活动条件显示
    const paq665 = document.getElementById('PAQ665');
    const moderateRecDetails = document.getElementById('moderate_rec_details');
    
    if (paq665 && moderateRecDetails) {
        paq665.addEventListener('change', function() {
            if (this.value === '1') {
                moderateRecDetails.style.display = 'block';
                document.getElementById('PAQ670').required = true;
                document.getElementById('PAD675').required = true;
            } else {
                moderateRecDetails.style.display = 'none';
                document.getElementById('PAQ670').required = false;
                document.getElementById('PAD675').required = false;
                document.getElementById('PAQ670').value = '';
                document.getElementById('PAD675').value = '';
            }
        });
    }
    
    console.log('PAQ问卷条件显示逻辑已初始化');
}

// 导出到全局作用域
window.SarcoAdvisor = {
    exportResults,
    showAlert,
    getCurrentAssessment: () => currentAssessment,
    toggleLanguage
};