{% extends "base.html" %}

{% block title %}{{ exam.title if exam else '参加考试' }} - FlashExam{% endblock %}

{% block head %}
<link rel="stylesheet" href="/static/css/libs/prism/prism.min.css">
<link rel="stylesheet" href="/static/css/libs/prism/prism-tomorrow.min.css">

<style>
:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-success: #10b981;
    --accent-warning: #f59e0b;
    --accent-danger: #ef4444;
    --border-color: #475569;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.exam-layout {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 20px;
    min-height: calc(100vh - 80px);
    padding: 20px;
}

.material-sidebar {
    position: sticky;
    top: 20px;
    height: calc(100vh - 120px);
    overflow-y: auto;
    background: var(--bg-secondary);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
}

.material-header {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    padding: 16px 20px;
    border-radius: 16px 16px 0 0;
    position: sticky;
    top: 0;
    z-index: 10;
}

.material-header h5 {
    margin: 0;
    color: white;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.material-content {
    padding: 20px;
    line-height: 1.7;
    font-size: 14px;
}

.material-content pre {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 16px;
    overflow-x: auto;
    border: 1px solid var(--border-color);
}

.material-content code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 13px;
}

.questions-area {
    overflow-y: auto;
    max-height: calc(100vh - 120px);
    padding-right: 10px;
}

.progress-header {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.timer-display {
    background: linear-gradient(135deg, var(--accent-danger), #dc2626);
    color: white;
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.timer-display.warning {
    background: linear-gradient(135deg, var(--accent-warning), #d97706);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

.progress-info {
    display: flex;
    gap: 24px;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.question-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: border-color 0.2s;
}

.question-card:hover {
    border-color: var(--accent-primary);
}

.question-card.has-material {
    border-left: 4px solid var(--accent-secondary);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.question-number {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 14px;
}

.type-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.type-choice { background: rgba(59, 130, 246, 0.2); color: #60a5fa; }
.type-judge { background: rgba(168, 85, 247, 0.2); color: #c084fc; }
.type-short_answer { background: rgba(16, 185, 129, 0.2); color: #34d399; }
.type-essay { background: rgba(245, 158, 11, 0.2); color: #fbbf24; }
.type-code_reading { background: rgba(236, 72, 153, 0.2); color: #f472b6; }
.type-code_practice { background: rgba(6, 182, 212, 0.2); color: #22d3ee; }
.type-programming { background: rgba(34, 197, 94, 0.2); color: #4ade80; }
.type-fill_blank { background: rgba(251, 146, 60, 0.2); color: #fb923c; }
.type-code_execution { background: rgba(139, 92, 246, 0.2); color: #a78bfa; }

.score-badge {
    background: rgba(16, 185, 129, 0.2);
    color: var(--accent-success);
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 13px;
}

.question-text {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.options-grid {
    display: grid;
    gap: 12px;
}

.option-item {
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s;
}

.option-item:hover {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--accent-primary);
}

.option-item.selected {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--accent-primary);
}

.option-label {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
}

.option-item.selected .option-label {
    background: var(--accent-primary);
}

.option-text {
    flex: 1;
    font-size: 14px;
}

.judge-options {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.judge-btn {
    flex: 1;
    max-width: 200px;
    padding: 16px;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    background: var(--bg-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.2s;
}

.judge-btn:hover {
    border-color: var(--accent-primary);
}

.judge-btn.true.selected {
    background: rgba(16, 185, 129, 0.2);
    border-color: var(--accent-success);
    color: var(--accent-success);
}

.judge-btn.false.selected {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--accent-danger);
    color: var(--accent-danger);
}

.text-answer {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.6;
    width: 100%;
    resize: vertical;
    min-height: 120px;
}

.text-answer:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.code-editor {
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 13px;
    line-height: 1.5;
    width: 100%;
    resize: vertical;
    min-height: 200px;
}

.code-editor:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.code-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border-radius: 8px;
}

.language-select {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 12px;
    color: var(--text-primary);
    font-size: 13px;
}

.run-btn {
    background: linear-gradient(135deg, var(--accent-success), #059669);
    border: none;
    border-radius: 8px;
    padding: 8px 16px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
}

.run-btn:hover {
    transform: translateY(-1px);
}

.run-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.output-panel {
    margin-top: 12px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.output-header {
    background: var(--bg-tertiary);
    padding: 8px 12px;
    font-size: 12px;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.output-content {
    padding: 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    max-height: 200px;
    overflow-y: auto;
    white-space: pre-wrap;
}

.output-content.success { color: var(--accent-success); }
.output-content.error { color: var(--accent-danger); }

.submit-section {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    border: 1px solid var(--border-color);
    margin-top: 20px;
}

.submit-btn {
    background: linear-gradient(135deg, var(--accent-success), #059669);
    border: none;
    border-radius: 12px;
    padding: 16px 48px;
    color: white;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(16, 185, 129, 0.3);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.no-material-notice {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.no-material-notice i {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

@media (max-width: 1024px) {
    .exam-layout {
        grid-template-columns: 1fr;
    }
    
    .material-sidebar {
        position: relative;
        height: auto;
        max-height: 300px;
    }
    
    .questions-area {
        max-height: none;
    }
}
</style>
{% endblock %}

{% block content %}
{% if has_taken %}
<div class="container mt-4">
    <div class="question-card text-center">
        <i class="bi bi-check-circle-fill text-success" style="font-size: 64px;"></i>
        <h3 class="mt-3">考试已完成</h3>
        <p class="text-secondary">每场考试只能参加一次</p>
        <div class="mt-4">
            <a href="{{ url_for('student.exams') }}" class="btn btn-primary me-2">其他考试</a>
            <a href="{{ url_for('student.results') }}" class="btn btn-outline-success">查看成绩</a>
        </div>
    </div>
</div>
{% elif not exam %}
<div class="container mt-4">
    <div class="question-card text-center">
        <i class="bi bi-x-circle-fill text-danger" style="font-size: 64px;"></i>
        <h3 class="mt-3">考试不存在</h3>
        <a href="{{ url_for('student.exams') }}" class="btn btn-primary mt-3">返回考试列表</a>
    </div>
</div>
{% else %}
<div class="exam-layout">
    <aside class="material-sidebar" id="materialSidebar">
        <div class="material-header">
            <h5><i class="bi bi-file-earmark-code"></i> 阅读材料</h5>
        </div>
        <div class="material-content" id="materialContent">
            <div class="no-material-notice">
                <i class="bi bi-file-earmark-text"></i>
                <p>当前题目无阅读材料</p>
                <small>材料将随题目自动显示</small>
            </div>
        </div>
    </aside>
    
    <main class="questions-area" id="questionsArea">
        <div class="progress-header">
            <div>
                <h4 class="mb-1">{{ exam.title }}</h4>
                <small class="text-secondary">智能在线考试系统</small>
            </div>
            <div class="timer-display" id="timerDisplay">
                <i class="bi bi-clock"></i>
                <span id="timeRemaining">{{ exam.duration_minutes }}:00</span>
            </div>
            <div class="progress-info">
                <div class="stat-item">
                    <div class="stat-value" id="answeredCount">0</div>
                    <div class="stat-label">已答题</div>
                </div>
                <div class="stat-item">
                    <div class="stat-value">{{ questions|length }}</div>
                    <div class="stat-label">总题数</div>
                </div>
                <div class="stat-item">
                    <div class="stat-value" id="progressPercent">0%</div>
                    <div class="stat-label">进度</div>
                </div>
            </div>
        </div>
        
        <form id="examForm">
            {% for question in questions %}
            <div class="question-card {% if question.material %}has-material{% endif %}" 
                 id="question-{{ loop.index }}"
                 data-question-id="{{ question.id }}"
                 {% if question.material %}data-material="{{ question.material|e }}"{% endif %}>
                <div class="question-header">
                    <div class="d-flex align-items-center gap-2">
                        <span class="question-number">{{ loop.index }}</span>
                        <span class="type-badge type-{{ question.question_type }}">
                            {{ question.question_type.replace('_', ' ').title() }}
                        </span>
                        <span class="score-badge">{{ question.score }}分</span>
                    </div>
                    {% if question.difficulty %}
                    <span class="text-warning">
                        {% for i in range(question.difficulty) %}★{% endfor %}
                    </span>
                    {% endif %}
                </div>
                
                <div class="question-text">
                    {{ question.question_text|safe_markdown }}
                </div>
                
                {% if question.question_type == 'choice' %}
                {% if question.options %}
                {% set options_dict = question.options|from_json %}
                {% if options_dict %}
                <div class="options-grid">
                    {% for key, value in options_dict.items() %}
                    <div class="option-item" data-value="{{ key }}" onclick="selectOption(this, '{{ question.id }}')">
                        <div class="option-label">{{ key }}</div>
                        <div class="option-text">{{ value }}</div>
                        <input type="radio" name="question_{{ question.id }}" value="{{ key }}" style="display:none"
                               {% if saved_answers.get('question_' + question.id|string) == key %}checked{% endif %}>
                    </div>
                    {% endfor %}
                </div>
                {% endif %}
                {% endif %}
                
                {% elif question.question_type == 'judge' %}
                <div class="judge-options">
                    <div class="judge-btn true" data-value="true" onclick="selectJudge(this, '{{ question.id }}')">
                        <i class="bi bi-check-circle-fill"></i> 正确
                        <input type="radio" name="question_{{ question.id }}" value="true" style="display:none"
                               {% if saved_answers.get('question_' + question.id|string) == 'true' %}checked{% endif %}>
                    </div>
                    <div class="judge-btn false" data-value="false" onclick="selectJudge(this, '{{ question.id }}')">
                        <i class="bi bi-x-circle-fill"></i> 错误
                        <input type="radio" name="question_{{ question.id }}" value="false" style="display:none"
                               {% if saved_answers.get('question_' + question.id|string) == 'false' %}checked{% endif %}>
                    </div>
                </div>
                
                {% elif question.question_type in ['code_reading', 'code_practice'] %}
                {% if question.question_type == 'code_practice' %}
                {% if question.options %}
                {% set options_dict = question.options|from_json %}
                {% if options_dict %}
                <div class="options-grid">
                    {% for key, value in options_dict.items() %}
                    <div class="option-item" data-value="{{ key }}" onclick="selectOption(this, '{{ question.id }}')">
                        <div class="option-label">{{ key }}</div>
                        <div class="option-text">{{ value }}</div>
                        <input type="radio" name="question_{{ question.id }}" value="{{ key }}" style="display:none"
                               {% if saved_answers.get('question_' + question.id|string) == key %}checked{% endif %}>
                    </div>
                    {% endfor %}
                </div>
                {% endif %}
                {% endif %}
                {% else %}
                <div>
                    <label class="form-label text-secondary mb-2">请在下方编写代码：</label>
                    <textarea class="code-editor question-input" name="question_{{ question.id }}" rows="10"
                              placeholder="// 在此输入您的代码...">{{ saved_answers.get('question_' + question.id|string, '') }}</textarea>
                </div>
                {% endif %}
                
                {% elif question.question_type == 'code_execution' %}
                <div class="code-execution-area">
                    <div class="code-toolbar">
                        <select class="language-select" id="lang_{{ question.id }}">
                            <option value="python">Python</option>
                            <option value="c">C</option>
                            <option value="java">Java</option>
                            <option value="bash">Shell</option>
                        </select>
                        <button type="button" class="run-btn" onclick="runCode({{ question.id }})">
                            <i class="bi bi-play-fill"></i> 运行代码
                        </button>
                    </div>
                    <textarea class="code-editor question-input" name="question_{{ question.id }}" id="code_{{ question.id }}" rows="12"
                              placeholder="// 编写代码后点击运行测试...">{{ saved_answers.get('question_' + question.id|string, '') }}</textarea>
                    <div class="output-panel" id="output_panel_{{ question.id }}" style="display:none;">
                        <div class="output-header">
                            <span>输出结果</span>
                            <span class="execution-time" id="exec_time_{{ question.id }}"></span>
                        </div>
                        <pre class="output-content" id="output_{{ question.id }}"></pre>
                    </div>
                </div>
                
                {% elif question.question_type == 'programming' %}
                <div>
                    <label class="form-label text-secondary mb-2">编程解答：</label>
                    <textarea class="code-editor question-input" name="question_{{ question.id }}" rows="15"
                              placeholder="// 请在此编写完整程序...">{{ saved_answers.get('question_' + question.id|string, '') }}</textarea>
                </div>
                
                {% elif question.question_type == 'fill_blank' %}
                <div>
                    <label class="form-label text-secondary mb-2">请填写答案：</label>
                    <input type="text" class="text-answer question-input" name="question_{{ question.id }}"
                           placeholder="在此输入答案..." value="{{ saved_answers.get('question_' + question.id|string, '') }}">
                </div>
                
                {% elif question.question_type in ['short_answer', 'essay', 'analysis', 'practice'] %}
                <div>
                    <label class="form-label text-secondary mb-2">答题区域：</label>
                    <textarea class="text-answer question-input" name="question_{{ question.id }}" rows="{{ 8 if question.question_type == 'essay' else 5 }}"
                              placeholder="请在此输入您的答案...">{{ saved_answers.get('question_' + question.id|string, '') }}</textarea>
                    <small class="text-muted mt-2 d-block">
                        {% if question.question_type == 'essay' %}建议字数：300-500字
                        {% elif question.question_type == 'analysis' %}建议字数：200-400字
                        {% endif %}
                    </small>
                </div>
                
                {% else %}
                <div>
                    <label class="form-label text-secondary mb-2">请在此解答：</label>
                    <textarea class="text-answer question-input" name="question_{{ question.id }}" rows="5"
                              placeholder="请输入答案...">{{ saved_answers.get('question_' + question.id|string, '') }}</textarea>
                </div>
                {% endif %}
            </div>
            {% endfor %}
        </form>
        
        <div class="submit-section">
            <button type="button" class="submit-btn" id="submitExam">
                <i class="bi bi-check-circle-fill me-2"></i> 提交考试
            </button>
            <p class="text-secondary mt-3 mb-0"><small>请确认所有题目已完成后再提交</small></p>
        </div>
    </main>
</div>

<div class="modal fade" id="submitModal" tabindex="-1">
    <div class="modal-dialog">
        <div class="modal-content" style="background: var(--bg-secondary); border: 1px solid var(--border-color);">
            <div class="modal-header" style="border-bottom: 1px solid var(--border-color);">
                <h5 class="modal-title"><i class="bi bi-exclamation-triangle text-warning me-2"></i>确认提交</h5>
                <button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal"></button>
            </div>
            <div class="modal-body">
                <div class="text-center mb-3">
                    <div class="d-flex justify-content-around">
                        <div>
                            <div class="stat-value" id="modalAnswered">0</div>
                            <div class="stat-label">已答题</div>
                        </div>
                        <div>
                            <div class="stat-value text-danger" id="modalUnanswered">0</div>
                            <div class="stat-label">未答题</div>
                        </div>
                    </div>
                </div>
                <div id="submitWarning"></div>
            </div>
            <div class="modal-footer" style="border-top: 1px solid var(--border-color);">
                <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">取消</button>
                <button type="button" class="btn btn-success" id="confirmSubmit">确认提交</button>
            </div>
        </div>
    </div>
</div>
{% endif %}
{% endblock %}

{% block scripts %}
<script src="/static/js/libs/prism/prism-core.min.js"></script>
<script src="/static/js/libs/prism/plugins/autoloader/prism-autoloader.min.js"></script>

<script>
let examDuration = {{ exam.duration_minutes | default(60) }} * 60;
let currentMaterial = null;

$(document).ready(function() {
    initializeExam();
    startTimer();
    bindEvents();
    setupMaterialObserver();
    if (typeof Prism !== 'undefined') Prism.highlightAll();
});

function initializeExam() {
    $('input[type="radio"]:checked').each(function() {
        const value = $(this).val();
        $(this).closest('.question-card').find(`[data-value="${value}"]`).addClass('selected');
    });
    updateProgress();
}

function selectOption(element, questionId) {
    const card = $(element).closest('.question-card');
    card.find('.option-item').removeClass('selected');
    card.find('input[type="radio"]').prop('checked', false);
    $(element).addClass('selected');
    $(element).find('input[type="radio"]').prop('checked', true);
    updateProgress();
    autoSave();
}

function selectJudge(element, questionId) {
    const card = $(element).closest('.question-card');
    card.find('.judge-btn').removeClass('selected');
    card.find('input[type="radio"]').prop('checked', false);
    $(element).addClass('selected');
    $(element).find('input[type="radio"]').prop('checked', true);
    updateProgress();
    autoSave();
}

function bindEvents() {
    $('.question-input').on('input change', function() {
        updateProgress();
        autoSave();
    });
    
    $('#submitExam').click(showSubmitModal);
    $('#confirmSubmit').click(submitExam);
    
    window.addEventListener('beforeunload', function(e) {
        autoSave();
    });
}

function setupMaterialObserver() {
    const observer = new IntersectionObserver((entries) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                const card = $(entry.target);
                const material = card.data('material');
                if (material) {
                    showMaterial(material);
                } else {
                    showNoMaterial();
                }
            }
        });
    }, { threshold: 0.5 });
    
    $('.question-card').each(function() {
        observer.observe(this);
    });
}

function showMaterial(material) {
    const content = renderMaterial(material);
    $('#materialContent').html(content);
    if (typeof Prism !== 'undefined') {
        $('#materialContent pre code').each(function() {
            Prism.highlightElement(this);
        });
    }
}

function showNoMaterial() {
    $('#materialContent').html(`
        <div class="no-material-notice">
            <i class="bi bi-file-earmark-text"></i>
            <p>当前题目无阅读材料</p>
        </div>
    `);
}

function renderMaterial(content) {
    let html = content;
    html = html.replace(/```(\w+)?\n?([\s\S]*?)```/g, function(m, lang, code) {
        lang = lang || 'text';
        return `<pre><code class="language-${lang}">${escapeHtml(code.trim())}</code></pre>`;
    });
    html = html.replace(/`([^`]+)`/g, '<code class="inline-code">$1</code>');
    return html.replace(/\n/g, '<br>');
}

function escapeHtml(text) {
    const map = { '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#039;' };
    return text.replace(/[&<>"']/g, m => map[m]);
}

function startTimer() {
    const timerEl = document.getElementById('timeRemaining');
    const displayEl = document.getElementById('timerDisplay');
    let timeLeft = examDuration;
    
    const timer = setInterval(function() {
        timeLeft--;
        const mins = Math.floor(timeLeft / 60);
        const secs = timeLeft % 60;
        timerEl.textContent = `${mins}:${secs.toString().padStart(2, '0')}`;
        
        if (timeLeft <= 300) {
            displayEl.classList.add('warning');
        }
        if (timeLeft <= 0) {
            clearInterval(timer);
            alert('考试时间结束，系统将自动提交！');
            submitExam();
        }
    }, 1000);
}

function updateProgress() {
    const total = $('.question-card').length;
    let answered = 0;
    
    $('.question-card').each(function() {
        if ($(this).find('input[type="radio"]:checked').length > 0) {
            answered++;
        } else if ($(this).find('.question-input').toArray().some(i => $(i).val().trim())) {
            answered++;
        }
    });
    
    const pct = total > 0 ? Math.round((answered / total) * 100) : 0;
    $('#answeredCount').text(answered);
    $('#progressPercent').text(pct + '%');
}

function autoSave() {
    const formData = new FormData(document.getElementById('examForm'));
    fetch(`/student/exam/{{ exam.id }}/save`, {
        method: 'POST',
        body: formData
    }).then(r => r.json()).then(d => {
        if (d.success) console.log('Auto-saved');
    }).catch(e => console.error('Auto-save error:', e));
}

function showSubmitModal() {
    updateProgress();
    const total = $('.question-card').length;
    const answered = parseInt($('#answeredCount').text());
    
    $('#modalAnswered').text(answered);
    $('#modalUnanswered').text(total - answered);
    
    if (total - answered > 0) {
        $('#submitWarning').html(`<div class="alert alert-danger">还有 ${total - answered} 道题目未完成！</div>`);
    } else {
        $('#submitWarning').html(`<div class="alert alert-success">所有题目已完成！</div>`);
    }
    
    new bootstrap.Modal(document.getElementById('submitModal')).show();
}

function submitExam() {
    bootstrap.Modal.getInstance(document.getElementById('submitModal')).hide();
    
    const btn = $('#submitExam');
    btn.prop('disabled', true).html('<i class="bi bi-arrow-repeat me-2"></i>提交中...');
    
    const formData = new FormData(document.getElementById('examForm'));
    fetch(`/student/exam/{{ exam.id }}/submit`, {
        method: 'POST',
        body: formData
    }).then(r => r.json()).then(d => {
        if (d.success) {
            alert('考试提交成功！');
            window.location.href = '/student/results';
        } else {
            alert('提交失败: ' + d.message);
            btn.prop('disabled', false).html('<i class="bi bi-check-circle-fill me-2"></i>提交考试');
        }
    }).catch(e => {
        alert('提交失败，请重试');
        btn.prop('disabled', false).html('<i class="bi bi-check-circle-fill me-2"></i>提交考试');
    });
}

async function runCode(questionId) {
    const code = document.getElementById(`code_${questionId}`).value;
    const lang = document.getElementById(`lang_${questionId}`).value;
    const outputPanel = document.getElementById(`output_panel_${questionId}`);
    const outputEl = document.getElementById(`output_${questionId}`);
    const timeEl = document.getElementById(`exec_time_${questionId}`);
    
    if (!code.trim()) {
        alert('请先输入代码');
        return;
    }
    
    outputPanel.style.display = 'block';
    outputEl.textContent = '执行中...';
    outputEl.className = 'output-content';
    
    try {
        const response = await fetch('/api/execute-code', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ code, language: lang })
        });
        
        const result = await response.json();
        
        if (result.success) {
            outputEl.textContent = result.output || '(无输出)';
            outputEl.classList.add('success');
            timeEl.textContent = `耗时: ${result.execution_time || 0}ms`;
        } else {
            outputEl.textContent = result.error || '执行失败';
            outputEl.classList.add('error');
            timeEl.textContent = '';
        }
    } catch (e) {
        outputEl.textContent = '请求失败: ' + e.message;
        outputEl.classList.add('error');
    }
}
</script>
{% endblock %}