// 房地产数据监控前端脚本

// 配置
const CONFIG = {
    apiBase: '/api',
    dateFormat: /^(\d{4})-(\d{2})-(\d{2})$/
};

// DOM元素
const elements = {
    datePicker: document.getElementById('datePicker'),
    loadBtn: document.getElementById('loadBtn'),
    todayBtn: document.getElementById('todayBtn'),
    loading: document.getElementById('loading'),
    error: document.getElementById('error'),
    content: document.getElementById('content'),
    dataDate: document.getElementById('dataDate'),
    lastUpdate: document.getElementById('lastUpdate')
};

// 表格映射
const tableMap = {
    'ksqf': 'kespTable',
    'ysxk': 'ysxkTable',
    'qfrg': 'qfrgTable',
    'qfqy': 'qfqyTable',
    'wyxf': 'wyqxTable',
    'xfxm': 'xfxmTable',
    'xfrg': 'xfrgTable',
    'xfqy': 'xfqyTable',
    'clf_month': 'clfyqyTable',
    'clf_day': 'clfrqyTable'
};

// 初始化
function init() {
    // 设置日期选择器默认值为今天
    const today = new Date().toISOString().split('T')[0];
    elements.datePicker.value = today;
    
    // 绑定事件
    elements.loadBtn.addEventListener('click', () => loadData(elements.datePicker.value));
    elements.todayBtn.addEventListener('click', () => {
        elements.datePicker.value = today;
        loadData(today);
    });
    
    // 加载今天的数据
    loadData(today);
    
    // 更新最后更新时间
    elements.lastUpdate.textContent = new Date().toLocaleString('zh-CN');
}

// 加载数据
async function loadData(date) {
    if (!date) {
        showError('请选择日期');
        return;
    }
    
    showLoading();
    
    try {
        const response = await fetch(`${CONFIG.apiBase}/data/${date}`);
        
        if (!response.ok) {
            throw new Error(`未找到 ${date} 的数据`);
        }
        
        const data = await response.json();
        
        if (data.error) {
            throw new Error(data.error);
        }
        
        displayData(data);
        showContent();
    } catch (err) {
        showError(`加载失败: ${err.message}`);
    }
}

// 显示数据
function displayData(data) {
    elements.dataDate.textContent = data.date;
    
    // 商品房数据统计
    const spfData = data.data.spfsjtj;
    for (const [key, value] of Object.entries(spfData)) {
        const tableId = tableMap[key];
        if (tableId) {
            renderSimpleTable(document.getElementById(tableId), value, rootDefined.spfsjtj.childMap[key].childMap);
        }
    }
    
    // 存量房月统计
    const clfData = data.data.clfwsqytj;
    for (const [key, value] of Object.entries(clfData)) {
        const tableId = tableMap[key];
        if (tableId) {
            renderSimpleTable(document.getElementById(tableId), value, rootDefined.clfwsqytj.childMap[key].childMap);
        }
    }
    
    // 经纪机构表格
    const jjjgData = data.data.clfwdtj.broker;
    renderBrokerTable(document.getElementById('jjjgTable'), jjjgData, rootDefined.clfwdtj.childMap.broker.childMap);

    // 按所在区县表格
    const districtData = data.data.clfwdtj.district;
    renderBrokerTable(document.getElementById('szqxTable'), districtData, rootDefined.clfwdtj.childMap.district.childMap);

    // 按建筑面积
    const areaData = data.data.clfwdtj.area;
    renderBrokerTable(document.getElementById('jzmjTable'), areaData, rootDefined.clfwdtj.childMap.area.childMap);

    // 加载截图
    loadScreenshot(data.date);
}

// 加载截图
function loadScreenshot(date) {
    const container = document.getElementById('screenshotContainer');
    const img = new Image();
    img.src = `/pic/${date}.png`;
    img.alt = '页面截图';
    img.className = 'screenshot-img';
    
    img.onload = function() {
        container.innerHTML = '';
        container.appendChild(img);
    };
    
    img.onerror = function() {
        container.innerHTML = '<p>暂无截图</p>';
    };
}

// 渲染简单表格（键值对）
function renderSimpleTable(table, data, fieldMap) {
    table.innerHTML = '';
    
    if (!data || Object.keys(data).length === 0) {
        table.innerHTML = '<tr><td colspan="2">暂无数据</td></tr>';
        return;
    }
    
    for (const item of Object.values(fieldMap)) {
        const row = document.createElement('tr');
        row.innerHTML = `
            <td>${item.label}</td>
            <td>${data[item.key]}</td>
        `;
        table.appendChild(row);
    }
}

// 渲染经纪机构表格
function renderBrokerTable(table, data, fieldMap) {
    table.innerHTML = '';
    
    if (!data || data.length === 0) {
        table.innerHTML = '<tr><td colspan="4">暂无数据</td></tr>';
        return;
    }
    
    // 表头
    const thead = document.createElement('thead');
    thead.innerHTML = `
        <tr>${Object.values(fieldMap).map(item => `<th>${item.label}</th>`).join('')}</tr>
    `;
    table.appendChild(thead);
    
    // 表体
    const tbody = document.createElement('tbody');
    data.forEach(item => {
        const row = document.createElement('tr');
        row.innerHTML = Object.values(fieldMap).map(field => `<td>${item[field.key]}</td>`).join('');
        tbody.appendChild(row);
    });
    table.appendChild(tbody);
}

// 格式化数字
function formatNumber(num) {
    if (num === null || num === undefined) return '-';
    const n = parseFloat(num);
    if (isNaN(n)) return num;
    
    // 如果是整数，添加千分位
    if (Number.isInteger(n)) {
        return n.toLocaleString('zh-CN');
    }
    
    // 保留2位小数
    return n.toLocaleString('zh-CN', { minimumFractionDigits: 2, maximumFractionDigits: 2 });
}

// 显示加载状态
function showLoading() {
    elements.loading.classList.remove('hidden');
    elements.error.classList.add('hidden');
    elements.content.classList.add('hidden');
}

// 显示错误
function showError(message) {
    elements.loading.classList.add('hidden');
    elements.error.textContent = message;
    elements.error.classList.remove('hidden');
    elements.content.classList.add('hidden');
}

// 显示内容
function showContent() {
    elements.loading.classList.add('hidden');
    elements.error.classList.add('hidden');
    elements.content.classList.remove('hidden');
}

// 启动
document.addEventListener('DOMContentLoaded', init);