// static/history.js

// 页面加载完成后加载历史记录
document.addEventListener('DOMContentLoaded', function() {
    loadHistory();
});

async function loadHistory() {
    const fileList = document.getElementById('fileList');
    
    try {
        const response = await fetch('/api/history', {
            method: 'POST'
        });
        if (!response.ok) {
            throw new Error('获取历史记录失败');
        }
        
        const data = await response.json();
        
        if (data.files && data.files.length > 0) {
            displayFileList(data.files);
        } else {
            fileList.innerHTML = `
                <div class="no-records">
                    <div style="font-size: 48px; margin-bottom: 20px;">📁</div>
                    <h3>暂无历史记录</h3>
                    <p>还没有上传过STP文件</p>
                    <button class="upload-btn" onclick="location.href='/upload'">
                        上传第一个文件
                    </button>
                </div>
            `;
        }
        
    } catch (error) {
        fileList.innerHTML = `
            <div class="no-records">
                <div style="font-size: 48px; margin-bottom: 20px;">❌</div>
                <h3>加载失败</h3>
                <p>${error.message}</p>
                <button class="upload-btn" onclick="loadHistory()">
                    重试
                </button>
            </div>
        `;
    }
}

function displayFileList(files) {
    const fileList = document.getElementById('fileList');
    
    fileList.innerHTML = files.map(file => `
        <div class="file-item" id="file-${file.filename}">
            <div class="file-header" onclick="toggleFileRecords('${file.filename}')">
                <div class="file-info">
                    <div class="file-name">📄 ${file.filename}</div>
                    <div class="file-meta">
                        总记录: ${file.record_count} 条 |
                        最后上传: ${formatDateTime(file.last_upload)}
                    </div>
                </div>
                <button class="expand-btn" onclick="event.stopPropagation(); toggleFileRecords('${file.filename}')">
                    ➕
                </button>
            </div>
            <div class="record-list" id="records-${file.filename}">
                <div class="loading">
                    <div class="spinner"></div>
                    <p>正在加载记录详情...</p>
                </div>
            </div>
        </div>
    `).join('');
}

async function toggleFileRecords(filename) {
    const fileItem = document.getElementById(`file-${filename}`);
    const recordList = document.getElementById(`records-${filename}`);
    const expandBtn = fileItem.querySelector('.expand-btn');
    
    // 切换展开状态
    if (fileItem.classList.contains('expanded')) {
        fileItem.classList.remove('expanded');
        expandBtn.textContent = '➕';
        return;
    }
    
    // 先设置展开状态
    fileItem.classList.add('expanded');
    expandBtn.textContent = '➖';
    
    // 如果已经加载过数据，直接显示
    if (recordList.dataset.loaded === 'true') {
        return;
    }
    
    try {
        const response = await fetch(`/api/history/${encodeURIComponent(filename)}`, {
            method: 'POST'
        });
        if (!response.ok) {
            throw new Error('获取记录详情失败');
        }
        
        const records = await response.json();
        
        if (records.length > 0) {
            recordList.innerHTML = records.map(record => `
                <div class="record-item" onclick="viewRecordDetails('${record.task_id}')">
                    <div class="record-header">
                        <div class="record-time">
                            📅 ${formatDateTime(record.upload_time)}
                        </div>
                        <div class="record-status status-${record.status}">
                            ${getStatusText(record.status)}
                        </div>
                    </div>
                    <div class="record-details">
                        <div>文件大小: ${formatFileSize(record.file_size)}</div>
                        <div>任务ID: ${record.task_id}</div>
                        <div>状态: ${record.status}</div>
                        ${record.completed_at ? `<div>完成时间: ${formatDateTime(record.completed_at)}</div>` : ''}
                    </div>
                </div>
            `).join('');
        } else {
            recordList.innerHTML = `
                <div class="no-records">
                    <p>暂无详细记录</p>
                </div>
            `;
        }
        
        recordList.dataset.loaded = 'true';
        
    } catch (error) {
        recordList.innerHTML = `
            <div class="no-records">
                <p>❌ 加载失败: ${error.message}</p>
                <button class="upload-btn" onclick="toggleFileRecords('${filename}')">
                    重试
                </button>
            </div>
        `;
    }
}

async function viewRecordDetails(taskId) {
    // 直接跳转到结果页面，由后端从数据库加载完整数据
    window.location.href = `/result/${taskId}`;
}

async function reanalyzeTask(taskId) {
    try {
        const response = await fetch(`/api/reanalyze/${taskId}`, {
            method: 'POST'
        });
        
        if (response.ok) {
            alert('重新分析任务已启动，请稍后查看结果');
            // 跳转到分析状态页面
            window.location.href = `/status/${taskId}`;
        } else {
            throw new Error('重新分析失败');
        }
    } catch (error) {
        alert(`重新分析失败: ${error.message}`);
    }
}

function getStatusText(status) {
    const statusMap = {
        'completed': '已完成',
        'processing': '处理中',
        'failed': '失败'
    };
    return statusMap[status] || status;
}

function formatFileSize(bytes) {
    if (!bytes || bytes === 0) return '0 Bytes';
    const k = 1024;
    const sizes = ['Bytes', 'KB', 'MB', 'GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
}

function formatDateTime(dateString) {
    if (!dateString) return 'N/A';
    // 后端已经返回格式化的时间字符串，直接返回
    return dateString;
}

// 跳转到上传页面
async function goToUpload() {
    try {
        // 上传页面需要GET请求，直接跳转
        window.location.href = '/';
    } catch (error) {
        console.error('跳转失败:', error);
        window.location.href = '/';
    }
}

// 跳转到主页
async function goToHome() {
    try {
        // 主页需要GET请求，直接跳转
        window.location.href = '/';
    } catch (error) {
        console.error('跳转失败:', error);
        window.location.href = '/';
    }
}