// AI帮你面试 - 核心JavaScript功能

// 全局变量
let currentQuestionId = 1;
const totalQuestions = 4;

// API配置
const API_CONFIG = {
    // 开发环境API密钥（实际生产环境应使用更安全的方式管理）
    apiKey: 'sk-0944c102849e45d9ab3f24d5169de289',
    headers: {
        'Content-Type': 'application/json',
        'X-API-Key': 'sk-0944c102849e45d9ab3f24d5169de289'
    }
};

// 面试流程数据（与后端保持一致）
const interviewProcess = [
    {"id": 1, "title": "自我介绍", "description": "请简要介绍您自己，包括教育背景和工作经验", "duration": "3分钟"},
    {"id": 2, "title": "技术能力评估", "description": "回答技术相关问题，展示专业知识", "duration": "15分钟"},
    {"id": 3, "title": "项目经验分享", "description": "分享您参与的重要项目和成果", "duration": "10分钟"},
    {"id": 4, "title": "问题与解答", "description": "您可以向面试官提问", "duration": "7分钟"}
];

// 页面加载完成后初始化
document.addEventListener('DOMContentLoaded', function() {
    // 初始化面试流程界面
    initInterviewProcess();
    
    // 绑定事件监听器
    bindEventListeners();
});

// 初始化面试流程界面
function initInterviewProcess() {
    // 高亮第一个步骤
    updateStepHighlight(currentQuestionId);
    
    // 更新当前问题显示
    updateCurrentQuestion(currentQuestionId);
}

// 绑定事件监听器
function bindEventListeners() {
    // 分析按钮
    const analyzeBtn = document.getElementById('analyze-btn');
    if (analyzeBtn) {
        analyzeBtn.addEventListener('click', handleAnalyzeAnswer);
    }
    
    // 下一题按钮
    const nextBtn = document.getElementById('next-question-btn');
    if (nextBtn) {
        nextBtn.addEventListener('click', handleNextQuestion);
    }
    
    // 返回修改按钮
    const backBtn = document.getElementById('back-to-question-btn');
    if (backBtn) {
        backBtn.addEventListener('click', handleBackToQuestion);
    }
    
    // 完成面试按钮
    const finishBtn = document.getElementById('finish-interview-btn');
    if (finishBtn) {
        finishBtn.addEventListener('click', handleFinishInterview);
    }
    
    // 关闭结果弹窗按钮
    const closeModalBtn = document.querySelector('.close');
    if (closeModalBtn) {
        closeModalBtn.addEventListener('click', closeResultsModal);
    }
    
    // 点击弹窗外部关闭
    const modal = document.getElementById('results-modal');
    if (modal) {
        modal.addEventListener('click', function(event) {
            if (event.target === modal) {
                closeResultsModal();
            }
        });
    }
    
    // 点击流程步骤切换问题
    const processSteps = document.querySelectorAll('.process-step');
    processSteps.forEach(step => {
        step.addEventListener('click', function() {
            const stepId = parseInt(this.dataset.stepId);
            if (stepId <= currentQuestionId) {
                switchToQuestion(stepId);
            }
        });
    });
}

// 处理AI分析回答
function handleAnalyzeAnswer() {
    const answerText = document.getElementById('answer-text').value;
    
    if (!answerText.trim()) {
        alert('请先输入您的回答！');
        return;
    }
    
    // 显示加载状态
    const analyzeBtn = document.getElementById('analyze-btn');
    const originalText = analyzeBtn.textContent;
    analyzeBtn.textContent = '分析中...';
    analyzeBtn.disabled = true;
    
    // 模拟AI分析过程（实际项目中这里会调用后端API）
    setTimeout(() => {
        // 调用AI分析API
        analyzeAnswerAPI(currentQuestionId, answerText)
            .then(data => {
                // 显示分析结果
                displayAnalysisResults(data);
                
                // 更新UI
                document.getElementById('question-stage').classList.add('hidden');
                document.getElementById('analysis-stage').classList.remove('hidden');
            })
            .catch(error => {
                console.error('分析失败:', error);
                alert('分析失败，请稍后重试！');
            })
            .finally(() => {
                // 恢复按钮状态
                analyzeBtn.textContent = originalText;
                analyzeBtn.disabled = false;
            });
    }, 1500);
}

// 调用AI分析API
async function analyzeAnswerAPI(questionId, answer) {
    try {
        const response = await fetch('/analyze_answer', {
            method: 'POST',
            headers: API_CONFIG.headers,
            body: JSON.stringify({
                question_id: questionId,
                answer: answer
            })
        });
        
        if (!response.ok) {
            throw new Error('分析请求失败');
        }
        
        return await response.json();
    } catch (error) {
        console.error('API调用错误:', error);
        throw error;
    }
}

// 显示AI分析结果
function displayAnalysisResults(data) {
    // 更新综合评分
    document.getElementById('overall-score').textContent = data.overall_score;
    
    // 更新内容分析进度条
    updateProgressBar('completeness-bar', 'completeness-value', data.content_analysis.completeness);
    updateProgressBar('relevance-bar', 'relevance-value', data.content_analysis.relevance);
    updateProgressBar('depth-bar', 'depth-value', data.content_analysis.depth);
    
    // 更新建议列表
    const suggestionsList = document.getElementById('suggestions-list');
    suggestionsList.innerHTML = '';
    
    data.suggestions.forEach(suggestion => {
        const li = document.createElement('li');
        li.textContent = suggestion;
        suggestionsList.appendChild(li);
    });
}

// 更新进度条
function updateProgressBar(barId, valueId, percentage) {
    const bar = document.getElementById(barId);
    const value = document.getElementById(valueId);
    
    bar.style.width = `${percentage}%`;
    value.textContent = `${percentage}%`;
}

// 处理下一题按钮点击
function handleNextQuestion() {
    if (currentQuestionId < totalQuestions) {
        currentQuestionId++;
        switchToQuestion(currentQuestionId);
    } else {
        alert('这是最后一个问题！');
    }
}

// 切换到指定问题
function switchToQuestion(questionId) {
    currentQuestionId = questionId;
    
    // 更新当前问题显示
    updateCurrentQuestion(questionId);
    
    // 更新步骤高亮
    updateStepHighlight(questionId);
    
    // 切换到问题阶段
    document.getElementById('question-stage').classList.remove('hidden');
    document.getElementById('analysis-stage').classList.add('hidden');
    
    // 清空回答输入
    document.getElementById('answer-text').value = '';
}

// 更新当前问题显示
function updateCurrentQuestion(questionId) {
    const question = interviewProcess.find(q => q.id === questionId);
    if (question) {
        document.getElementById('current-question-title').textContent = question.title;
        document.getElementById('current-question-description').textContent = question.description;
    }
}

// 更新步骤高亮
function updateStepHighlight(questionId) {
    const steps = document.querySelectorAll('.process-step');
    steps.forEach(step => {
        const stepId = parseInt(step.dataset.stepId);
        if (stepId === questionId) {
            step.classList.add('active');
        } else if (stepId < questionId) {
            step.classList.add('completed');
            step.classList.remove('active');
        } else {
            step.classList.remove('active', 'completed');
        }
    });
}

// 处理返回修改按钮
function handleBackToQuestion() {
    document.getElementById('analysis-stage').classList.add('hidden');
    document.getElementById('question-stage').classList.remove('hidden');
}

// 处理完成面试按钮
function handleFinishInterview() {
    // 显示确认对话框
    if (confirm('确定要完成面试吗？')) {
        // 调用获取面试结果API
        getInterviewResults()
            .then(results => {
                displayInterviewResults(results);
                openResultsModal();
            })
            .catch(error => {
                console.error('获取结果失败:', error);
                alert('获取面试结果失败，请稍后重试！');
            });
    }
}

// 获取面试结果
async function getInterviewResults() {
    try {
        const response = await fetch('/get_results', {
            headers: API_CONFIG.headers
        });
        if (!response.ok) {
            throw new Error('获取结果请求失败');
        }
        return await response.json();
    } catch (error) {
        console.error('API调用错误:', error);
        throw error;
    }
}

// 显示面试结果
function displayInterviewResults(results) {
    const container = document.getElementById('results-container');
    
    container.innerHTML = `
        <div class="score-card">
            <h3>最终评分</h3>
            <div class="score-value">${results.overall_score}</div>
        </div>
        
        <div class="results-details">
            <h3>分类评分</h3>
            <div class="category-scores">
                <div class="score-item">
                    <label>专业知识</label>
                    <div class="progress">
                        <div class="progress-fill" style="width: ${results.category_scores.professional_knowledge}%"></div>
                    </div>
                    <span>${results.category_scores.professional_knowledge}%</span>
                </div>
                
                <div class="score-item">
                    <label>沟通能力</label>
                    <div class="progress">
                        <div class="progress-fill" style="width: ${results.category_scores.communication_skills}%"></div>
                    </div>
                    <span>${results.category_scores.communication_skills}%</span>
                </div>
                
                <div class="score-item">
                    <label>解决问题</label>
                    <div class="progress">
                        <div class="progress-fill" style="width: ${results.category_scores.problem_solving}%"></div>
                    </div>
                    <span>${results.category_scores.problem_solving}%</span>
                </div>
                
                <div class="score-item">
                    <label>经验相关性</label>
                    <div class="progress">
                        <div class="progress-fill" style="width: ${results.category_scores.experience_relevance}%"></div>
                    </div>
                    <span>${results.category_scores.experience_relevance}%</span>
                </div>
            </div>
        </div>
        
        <div class="strengths-improvements">
            <div class="strengths">
                <h3>👍 优点</h3>
                <ul>
                    ${results.strengths.map(strength => `<li>${strength}</li>`).join('')}
                </ul>
            </div>
            
            <div class="improvements">
                <h3>📈 需要改进的地方</h3>
                <ul>
                    ${results.improvement_areas.map(area => `<li>${area}</li>`).join('')}
                </ul>
            </div>
        </div>
        
        <div class="final-recommendation">
            <h3>💡 最终建议</h3>
            <p class="recommendation-text">${results.final_recommendation}</p>
        </div>
    `;
    
    // 添加结果页面样式
    addResultsStyles();
}

// 添加结果页面样式
function addResultsStyles() {
    // 动态添加结果页面需要的CSS样式
    const style = document.createElement('style');
    style.textContent = `
        .results-details {
            margin: 30px 0;
        }
        
        .category-scores {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }
        
        .score-item {
            background: white;
            padding: 15px;
            border-radius: 10px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }
        
        .score-item label {
            display: block;
            margin-bottom: 10px;
            font-weight: bold;
            color: #555;
        }
        
        .strengths-improvements {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin: 30px 0;
        }
        
        .strengths, .improvements {
            background: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
        }
        
        .strengths h3, .improvements h3 {
            margin-bottom: 15px;
            color: #333;
            border-bottom: 2px solid #eee;
            padding-bottom: 10px;
        }
        
        .strengths ul, .improvements ul {
            list-style: none;
        }
        
        .strengths li, .improvements li {
            padding: 10px 0;
            border-bottom: 1px solid #f0f0f0;
            color: #555;
        }
        
        .strengths li:last-child, .improvements li:last-child {
            border-bottom: none;
        }
        
        .final-recommendation {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 30px;
            border-radius: 10px;
            text-align: center;
        }
        
        .final-recommendation h3 {
            margin-bottom: 20px;
            font-size: 1.5rem;
        }
        
        .recommendation-text {
            font-size: 1.2rem;
            font-weight: bold;
            line-height: 1.6;
        }
    `;
    document.head.appendChild(style);
}

// 打开结果弹窗
function openResultsModal() {
    document.getElementById('results-modal').classList.remove('hidden');
}

// 关闭结果弹窗
function closeResultsModal() {
    document.getElementById('results-modal').classList.add('hidden');
}