document.getElementById('importJson').addEventListener('change', function(event) {
    var files = event.target.files;
    if (files.length > 0) {
        Array.from(files).forEach(file => {
            var reader = new FileReader();
            reader.onload = function(e) {
                try {
                    var config = JSON.parse(e.target.result);
                    applyConfig(config);
                } catch (err) {
                    errorSystem.show('导入配置失败: ' + err.message, 'error');
                }
            };
            reader.readAsText(file);
        });
    }
});

function applyConfig(config) {
    try {
        fetch('audio_files.json')
            .then(response => response.json())
            .then(audioFiles => {
                const reminderCookie = getCookie("reminders");
                
                // 获取有效的音频列表和默认音频
                let validAudioTypes = Object.keys(audioFiles);
                let defaultAudio = validAudioTypes[0];

                if (config.examInfos) {
                    courseSchedule = config.examInfos;
                    updateScheduleTable();
                }
                if (config.examName) {
                    document.title = config.examName;
                    document.getElementById('examTitle').textContent = config.examName;
                }
                if (config.message) {
                    document.getElementById('examMessage').textContent = config.message;
                }
                if (config.room) {
                    document.getElementById('timeDescription').textContent = '考场: ' + config.room;
                }

                // 验证并修复提醒中的音频设置
                if (config.reminders) {
                    config.reminders = config.reminders.map(reminder => {
                        if (!validAudioTypes.includes(reminder.audio)) {
                            errorSystem.show(`音频"${reminder.audio}"不存在，已替换为"${defaultAudio}"`, 'info');
                            reminder.audio = defaultAudio;
                        }
                        return reminder;
                    });

                    // 清空现有提醒表
                    var table = document.getElementById('reminderTable');
                    while (table.rows.length > 2) {
                        table.deleteRow(1);
                    }

                    // 添加新的提醒设置
                    config.reminders.forEach(function(reminder) {
                        var row = table.insertRow(table.rows.length - 1);
                        let audioOptions = validAudioTypes
                            .map(audio => `<option value="${audio}" ${reminder.audio === audio ? 'selected' : ''}>${audio}</option>`)
                            .join('');
                        
                        row.innerHTML = `
                            <td>
                                <select>
                                    <option value="beforeStart" ${reminder.condition === 'beforeStart' ? 'selected' : ''}>当距离考试开始时间还有</option>
                                    <option value="beforeEnd" ${reminder.condition === 'beforeEnd' ? 'selected' : ''}>当距离考试结束时间还有</option>
                                    <option value="afterEnd" ${reminder.condition === 'afterEnd' ? 'selected' : ''}>当考试结束后</option>
                                    <option value="start" ${reminder.condition === 'start' ? 'selected' : ''}>当考试开始时</option>
                                    <option value="end" ${reminder.condition === 'end' ? 'selected' : ''}>当考试结束时</option>
                                </select>
                            </td>
                            <td><input type="number" value="${reminder.time}" placeholder="${reminder.condition === 'start' || reminder.condition === 'end' ? '-' : '分钟'}" ${reminder.condition === 'start' || reminder.condition === 'end' ? 'disabled' : ''}></td>
                            <td>
                                <select name="audioSelect">
                                    ${audioOptions}
                                </select>
                            </td>
                            <td><button onclick="removeReminder(this)">删除</button></td>
                        `;
                        row.cells[0].querySelector('select').addEventListener('change', function() {
                            row.cells[1].querySelector('input').disabled = this.value === 'start' || this.value === 'end';
                            row.cells[1].querySelector('input').placeholder = this.value === 'start' || this.value === 'end' ? '-' : '分钟';
                        });
                    });

                    // 只更新提醒队列，不保存到 Cookie
                    loadRemindersToQueue(config.reminders);
                }
                
                errorSystem.show('配置导入成功（临时生效）', 'info');
            })
            .catch(err => {
                errorSystem.show('获取音频列表失败: ' + err.message, 'error');
            });
    } catch (err) {
        errorSystem.show('应用配置失败: ' + err.message, 'error');
    }
}

function exportConfig() {
    var table = document.getElementById('reminderTable');
    var reminders = [];
    for (var i = 1; i < table.rows.length - 1; i++) {
        var row = table.rows[i];
        var condition = row.cells[0].querySelector('select').value;
        var timeInput = row.cells[1].querySelector('input');
        var audioSelect = row.cells[2].querySelector('select');
        if (timeInput && audioSelect) {
            reminders.push({
                condition: condition,
                time: timeInput.value || 0,
                audio: audioSelect.value || 'classStart'
            });
        }
    }
    
    var config = {
        examInfos: courseSchedule,
        examName: document.title,
        message: document.getElementById('examMessage').textContent || "诚信考试，禁止作弊",
        room: document.getElementById('timeDescription').textContent.replace('考场: ', ''),
        reminders: reminders
    };

    var dataStr = "data:text/json;charset=utf-8," + encodeURIComponent(JSON.stringify(config));
    var downloadAnchorNode = document.createElement('a');
    downloadAnchorNode.setAttribute("href", dataStr);
    downloadAnchorNode.setAttribute("download", "exam_config.json");
    document.body.appendChild(downloadAnchorNode);
    downloadAnchorNode.click();
    downloadAnchorNode.remove();
}