// Meetings Management JavaScript

let currentMeetings = [];
let currentFilter = 'all';

// 检查登录状态
async function checkLogin() {
    try {
        const response = await window.DAELAPI.auth.checkAuth();
        if (!response.authenticated) {
            window.location.href = 'login.html';
            return false;
        }
        return true;
    } catch (error) {
        window.location.href = 'login.html';
        return false;
    }
}

// 加载组会列表
async function loadMeetings() {
    try {
        const response = await window.DAELAPI.meetings.getMeetings();
        currentMeetings = response.meetings;
        displayMeetings(currentMeetings);
    } catch (error) {
        console.error('Failed to load meetings:', error);
        document.getElementById('meetings-list').innerHTML = '<p class="text-red-600">加载失败</p>';
    }
}

// 显示组会列表
function displayMeetings(meetings) {
    const container = document.getElementById('meetings-list');
    
    // 根据筛选器过滤
    let filteredMeetings = meetings;
    if (currentFilter !== 'all') {
        filteredMeetings = meetings.filter(m => m.status === currentFilter);
    }
    
    if (filteredMeetings.length === 0) {
        container.innerHTML = '<p class="text-gray-500 text-center py-12">暂无组会</p>';
        return;
    }
    
    container.innerHTML = filteredMeetings.map(meeting => {
        const date = new Date(meeting.date);
        const isOwner = meeting.organizer_id === (window.currentUser?.id);
        
        return `
            <div class="bg-white border border-gray-200 p-6 rounded-lg hover:shadow-md transition-shadow">
                <div class="flex justify-between items-start">
                    <div class="flex-1">
                        <div class="flex items-center gap-3 mb-2">
                            <h3 class="text-xl font-bold">${meeting.title}</h3>
                            <span class="text-xs px-2 py-1 rounded ${getStatusColor(meeting.status)}">${getStatusText(meeting.status)}</span>
                            <span class="text-xs px-2 py-1 rounded bg-gray-100">${getTypeText(meeting.meeting_type)}</span>
                        </div>
                        <p class="text-gray-600 text-sm mb-3">${meeting.description || ''}</p>
                        <div class="flex gap-6 text-sm text-gray-500">
                            <span>📅 ${date.toLocaleDateString('zh-CN')}</span>
                            <span>🕐 ${meeting.time || ''}</span>
                            <span>📍 ${meeting.location || '未指定'}</span>
                            <span>👤 组织者: ${meeting.organizer_name || ''}</span>
                            <span>👥 报名: ${meeting.attendee_count || 0} 人</span>
                        </div>
                    </div>
                    <div class="flex gap-2 ml-4">
                        <button onclick="viewMeeting(${meeting.id})" class="text-sm text-blue-600 hover:text-blue-800 px-3 py-1 border border-blue-600 rounded">查看</button>
                        ${isOwner ? `
                            <button onclick="editMeeting(${meeting.id})" class="text-sm text-gray-600 hover:text-gray-800 px-3 py-1 border border-gray-600 rounded">编辑</button>
                            <button onclick="deleteMeeting(${meeting.id})" class="text-sm text-red-600 hover:text-red-800 px-3 py-1 border border-red-600 rounded">删除</button>
                        ` : ''}
                    </div>
                </div>
            </div>
        `;
    }).join('');
}

// 状态颜色
function getStatusColor(status) {
    const colors = {
        'planned': 'bg-blue-100 text-blue-800',
        'ongoing': 'bg-green-100 text-green-800',
        'completed': 'bg-gray-100 text-gray-800',
        'cancelled': 'bg-red-100 text-red-800'
    };
    return colors[status] || 'bg-gray-100 text-gray-800';
}

// 状态文本
function getStatusText(status) {
    const texts = {
        'planned': '计划中',
        'ongoing': '进行中',
        'completed': '已结束',
        'cancelled': '已取消'
    };
    return texts[status] || status;
}

// 类型文本
function getTypeText(type) {
    const texts = {
        'weekly': '周会',
        'monthly': '月会',
        'special': '专题会'
    };
    return texts[type] || type;
}

// 显示组会表单
function showMeetingForm(meetingId = null) {
    const modal = document.getElementById('meeting-modal');
    const form = document.getElementById('meeting-form');
    const title = document.getElementById('meeting-modal-title');
    
    if (meetingId) {
        const meeting = currentMeetings.find(m => m.id === meetingId);
        if (meeting) {
            title.textContent = '编辑组会';
            document.getElementById('meeting-id').value = meeting.id;
            document.getElementById('meeting-title').value = meeting.title;
            document.getElementById('meeting-description').value = meeting.description || '';
            document.getElementById('meeting-date').value = meeting.date;
            document.getElementById('meeting-time').value = meeting.time || '';
            document.getElementById('meeting-location').value = meeting.location || '';
            document.getElementById('meeting-type').value = meeting.meeting_type;
            document.getElementById('meeting-status').value = meeting.status;
        }
    } else {
        title.textContent = '创建组会';
        form.reset();
        document.getElementById('meeting-id').value = '';
        // 设置默认日期为今天
        const today = new Date().toISOString().split('T')[0];
        document.getElementById('meeting-date').value = today;
    }
    
    modal.classList.remove('hidden');
}

// 关闭组会表单
function closeMeetingForm() {
    document.getElementById('meeting-modal').classList.add('hidden');
}

// 保存组会
async function saveMeeting(event) {
    event.preventDefault();
    
    const meetingId = document.getElementById('meeting-id').value;
    const meetingData = {
        title: document.getElementById('meeting-title').value,
        description: document.getElementById('meeting-description').value,
        date: document.getElementById('meeting-date').value,
        time: document.getElementById('meeting-time').value,
        location: document.getElementById('meeting-location').value,
        meeting_type: document.getElementById('meeting-type').value,
        status: document.getElementById('meeting-status').value
    };
    
    try {
        if (meetingId) {
            await window.DAELAPI.meetings.updateMeeting(meetingId, meetingData);
        } else {
            await window.DAELAPI.meetings.createMeeting(meetingData);
        }
        closeMeetingForm();
        loadMeetings();
    } catch (error) {
        alert('保存失败: ' + error.message);
    }
}

// 查看组会详情
async function viewMeeting(meetingId) {
    try {
        const response = await window.DAELAPI.meetings.getMeeting(meetingId);
        const meeting = response.meeting;
        displayMeetingDetail(meeting);
    } catch (error) {
        alert('加载失败: ' + error.message);
    }
}

// 显示组会详情
function displayMeetingDetail(meeting) {
    const modal = document.getElementById('meeting-detail-modal');
    const container = document.getElementById('meeting-detail-content');
    const date = new Date(meeting.date);
    const isOwner = meeting.organizer_id === (window.currentUser?.id);
    
    container.innerHTML = `
        <div class="flex justify-between items-start mb-6">
            <h3 class="text-2xl font-bold">${meeting.title}</h3>
            <button onclick="closeMeetingDetail()" class="text-gray-400 hover:text-gray-600">✕</button>
        </div>
        
        <div class="space-y-4 mb-6">
            <div>
                <span class="text-sm text-gray-500">日期时间：</span>
                <span class="text-sm">${date.toLocaleDateString('zh-CN')} ${meeting.time || ''}</span>
            </div>
            <div>
                <span class="text-sm text-gray-500">地点：</span>
                <span class="text-sm">${meeting.location || '未指定'}</span>
            </div>
            <div>
                <span class="text-sm text-gray-500">组织者：</span>
                <span class="text-sm">${meeting.organizer_name || ''}</span>
            </div>
            <div>
                <span class="text-sm text-gray-500">类型：</span>
                <span class="text-sm">${getTypeText(meeting.meeting_type)}</span>
            </div>
            <div>
                <span class="text-sm text-gray-500">状态：</span>
                <span class="text-sm ${getStatusColor(meeting.status)} px-2 py-1 rounded">${getStatusText(meeting.status)}</span>
            </div>
            ${meeting.description ? `
                <div>
                    <span class="text-sm text-gray-500">描述：</span>
                    <p class="text-sm mt-1">${meeting.description}</p>
                </div>
            ` : ''}
        </div>
        
        <div class="mb-6">
            <h4 class="font-bold mb-3">参会人员 (${meeting.attendees?.length || 0})</h4>
            <div class="space-y-2">
                ${meeting.attendees && meeting.attendees.length > 0 ? 
                    meeting.attendees.map(attendee => `
                        <div class="flex items-center justify-between p-2 bg-gray-50 rounded">
                            <span class="text-sm">${attendee.username}</span>
                            <span class="text-xs text-gray-500">${getStatusText(attendee.status)}</span>
                        </div>
                    `).join('') : 
                    '<p class="text-sm text-gray-500">暂无报名</p>'
                }
            </div>
            ${!isOwner && meeting.status === 'planned' ? `
                <button onclick="registerForMeeting(${meeting.id})" class="mt-3 bg-black text-white px-4 py-2 rounded text-sm hover:bg-gray-800">
                    报名参会
                </button>
            ` : ''}
        </div>
        
        ${meeting.meeting_notes ? `
            <div class="mb-6">
                <h4 class="font-bold mb-3">会议记录</h4>
                <div class="p-4 bg-gray-50 rounded text-sm whitespace-pre-wrap">${meeting.meeting_notes}</div>
            </div>
        ` : ''}
        
        ${meeting.files && meeting.files.length > 0 ? `
            <div class="mb-6">
                <h4 class="font-bold mb-3">附件 (${meeting.files.length})</h4>
                <div class="space-y-2">
                    ${meeting.files.map(file => `
                        <div class="flex items-center justify-between p-2 bg-gray-50 rounded">
                            <span class="text-sm">${file.name}</span>
                            <button onclick="window.DAELAPI.meetings.downloadMeetingFile(${meeting.id}, ${file.id})" 
                                    class="text-sm text-blue-600 hover:text-blue-800">
                                下载
                            </button>
                        </div>
                    `).join('')}
                </div>
            </div>
        ` : ''}
        
        ${isOwner ? `
            <div class="flex gap-4">
                <button onclick="editMeeting(${meeting.id})" class="bg-black text-white px-4 py-2 rounded text-sm hover:bg-gray-800">
                    编辑
                </button>
                <button onclick="deleteMeeting(${meeting.id})" class="bg-red-600 text-white px-4 py-2 rounded text-sm hover:bg-red-700">
                    删除
                </button>
            </div>
        ` : ''}
    `;
    
    modal.classList.remove('hidden');
}

// 关闭组会详情
function closeMeetingDetail() {
    document.getElementById('meeting-detail-modal').classList.add('hidden');
}

// 编辑组会
function editMeeting(meetingId) {
    closeMeetingDetail();
    showMeetingForm(meetingId);
}

// 删除组会
async function deleteMeeting(meetingId) {
    if (!confirm('确定要删除这个组会吗？')) return;
    
    try {
        await window.DAELAPI.meetings.deleteMeeting(meetingId);
        closeMeetingDetail();
        loadMeetings();
    } catch (error) {
        alert('删除失败: ' + error.message);
    }
}

// 报名参会
async function registerForMeeting(meetingId) {
    try {
        await window.DAELAPI.meetings.registerMeeting(meetingId);
        alert('报名成功！');
        viewMeeting(meetingId); // 刷新详情
    } catch (error) {
        alert('报名失败: ' + error.message);
    }
}

// 筛选器切换
document.querySelectorAll('.filter-tab').forEach(tab => {
    tab.addEventListener('click', () => {
        document.querySelectorAll('.filter-tab').forEach(t => {
            t.classList.remove('active', 'border-black', 'text-black');
            t.classList.add('text-gray-500');
        });
        tab.classList.add('active', 'border-black', 'text-black');
        tab.classList.remove('text-gray-500');
        
        currentFilter = tab.dataset.filter;
        displayMeetings(currentMeetings);
    });
});

// 初始化
document.addEventListener('DOMContentLoaded', async () => {
    if (await checkLogin()) {
        // 获取当前用户信息
        try {
            const authResponse = await window.DAELAPI.auth.checkAuth();
            window.currentUser = authResponse.user;
        } catch (error) {
            console.error('Failed to get user info:', error);
        }
        
        loadMeetings();
        
        // 退出按钮
        document.getElementById('logout-btn').addEventListener('click', async () => {
            await logout();
        });
    }
});