const express = require('express');
const jianSunDb = require('../config/jianSunDatabase');

const router = express.Router();

const MAX_PAGE_SIZE = 100;

function safeInt(value, fallback) {
  const parsed = Number.parseInt(value, 10);
  return Number.isFinite(parsed) && parsed > 0 ? parsed : fallback;
}

function normalizeSortField(field) {
  const allowed = new Set([
    'id', 'shopName', 'createTime', 'activity_name', 'activity_id',
    'goods_name', 'goods_id', 'min_activity_sku_price', 'max_activity_sku_price',
    'activity_goods_start_time', 'activity_goods_end_time', 'status',
  ]);
  return allowed.has(field) ? field : 'activity_goods_start_time';
}

function normalizeSortOrder(order) {
  return String(order || '').toLowerCase() === 'asc' ? 'ASC' : 'DESC';
}

function escapeColumn(field) {
  const allowed = new Set([
    'id', 'shopName', 'createTime', 'business_type_str', 'activity_name', 'activity_id',
    'goods_name', 'goods_id', 'hd_thumb_url', 'enroll_time', 'min_activity_sku_price',
    'max_activity_sku_price', 'activity_goods_start_time', 'activity_goods_end_time', 'status',
  ]);
  if (!allowed.has(field)) return '[id]';
  return field === 'enroll_time' ? '[enroll_time]' : `[${field}]`;
}

async function getSecondLatestDate() {
  const rows = await jianSunDb.query(
    `SELECT DISTINCT TOP 2 LEFT([createTime], 10) AS createDate
     FROM dbo.pdd_DataActivityRecords
     WHERE [createTime] IS NOT NULL AND LTRIM(RTRIM([createTime])) != ''
     ORDER BY createDate DESC`
  );
  if (rows.length >= 2) return rows[1].createDate;
  if (rows.length === 1) return rows[0].createDate;
  return '';
}

router.get('/latest-date', async (req, res) => {
  try {
    const date = await getSecondLatestDate();
    res.json({ success: true, data: { date } });
  } catch (error) {
    console.error('[MarketingEvents] 查询最新数据日期失败:', error.message);
    res.status(500).json({ success: false, error: error.message });
  }
});

router.get('/list', async (req, res) => {
  try {
    const {
      page = 1,
      pageSize = 20,
      sortBy = 'activity_goods_start_time',
      sortOrder = 'DESC',
      shopName,
      activityType,
      activityName,
      activityId,
      goodsName,
      goodsId,
      status,
      date,
    } = req.query;

    const currentPage = safeInt(page, 1);
    const limit = Math.min(safeInt(pageSize, 20), MAX_PAGE_SIZE);
    const offset = (currentPage - 1) * limit;
    const sortColumn = normalizeSortField(sortBy);
    const sortDir = normalizeSortOrder(sortOrder);

    const whereParts = [];
    const params = {};

    const filterDate = (date && String(date).trim()) || await getSecondLatestDate();
    if (filterDate) {
      whereParts.push('LEFT([createTime], 10) = @filterDate');
      params.filterDate = filterDate;
    }

    if (shopName && shopName.trim()) {
      whereParts.push('[shopName] LIKE @shopName');
      params.shopName = `%${shopName.trim()}%`;
    }
    if (activityType && activityType.trim()) {
      whereParts.push('[business_type_str] LIKE @activityType');
      params.activityType = `%${activityType.trim()}%`;
    }
    if (activityName && activityName.trim()) {
      whereParts.push('[activity_name] LIKE @activityName');
      params.activityName = `%${activityName.trim()}%`;
    }
    if (activityId && String(activityId).trim()) {
      whereParts.push('[activity_id] = @activityId');
      params.activityId = Number(activityId);
    }
    if (goodsName && goodsName.trim()) {
      whereParts.push('[goods_name] LIKE @goodsName');
      params.goodsName = `%${goodsName.trim()}%`;
    }
    if (goodsId && String(goodsId).trim()) {
      whereParts.push('[goods_id] = @goodsId');
      params.goodsId = String(goodsId).trim();
    }
    if (status !== undefined && status !== '' && status !== 'all') {
      whereParts.push('[status] = @status');
      params.status = Number(status);
    }

    const whereSql = whereParts.length > 0 ? `WHERE ${whereParts.join(' AND ')}` : '';

    const countResult = await jianSunDb.query(
      `SELECT COUNT(*) AS total FROM dbo.pdd_DataActivityRecords ${whereSql}`,
      params
    );
    const total = countResult[0]?.total || 0;

    const dataResult = await jianSunDb.query(
      `SELECT
        [id],
        [shopName],
        [createTime],
        [business_type_str] AS activityType,
        [activity_name] AS activityName,
        [activity_id] AS activityId,
        [goods_name] AS goodsName,
        [goods_id] AS goodsId,
        [hd_thumb_url] AS thumbUrl,
        [enroll_time] AS enrollTime,
        TRY_CONVERT(decimal(18,2), [min_activity_sku_price]) / 100.0 AS minPrice,
        TRY_CONVERT(decimal(18,2), [max_activity_sku_price]) / 100.0 AS maxPrice,
        [activity_goods_start_time] AS activityStartTime,
        [activity_goods_end_time] AS activityEndTime,
        [status],
        CASE WHEN [status] = 501 THEN N'报名成功' ELSE CONCAT(N'状态 ', [status]) END AS statusLabel
       FROM dbo.pdd_DataActivityRecords
       ${whereSql}
       ORDER BY ${escapeColumn(sortColumn)} ${sortDir}
       OFFSET @offset ROWS FETCH NEXT @limit ROWS ONLY`,
      { ...params, offset, limit }
    );

    const statusCountsResult = await jianSunDb.query(
      `SELECT
        [status],
        COUNT(*) AS count
       FROM dbo.pdd_DataActivityRecords
       ${whereSql}
       GROUP BY [status]
       ORDER BY [status]`,
      params
    );

    const statusCounts = {};
    let totalAll = 0;
    statusCountsResult.forEach((row) => {
      statusCounts[row.status] = row.count;
      totalAll += row.count;
    });

    res.json({
      success: true,
      data: {
        list: dataResult,
        total,
        page: currentPage,
        pageSize: limit,
        filterDate,
        statusCounts: { all: totalAll, ...statusCounts },
      },
    });
  } catch (error) {
    console.error('[MarketingEvents] 查询活动记录失败:', error.message);
    res.status(500).json({ success: false, error: error.message });
  }
});

router.get('/summary', async (req, res) => {
  try {
    const { date } = req.query;
    const filterDate = (date && String(date).trim()) || await getSecondLatestDate();

    const whereSql = filterDate ? 'WHERE LEFT([createTime], 10) = @filterDate' : '';
    const params = filterDate ? { filterDate } : {};

    const [row] = await jianSunDb.query(
      `SELECT
        COUNT(*) AS totalRecords,
        SUM(CASE WHEN [status] = 501 THEN 1 ELSE 0 END) AS successCount,
        COUNT(DISTINCT TRY_CONVERT(varchar(50), [goods_id])) AS goodsCount,
        COUNT(DISTINCT [shopName]) AS shopCount,
        COUNT(DISTINCT [activity_id]) AS activityIdCount,
        COUNT(DISTINCT [business_type_str]) AS activityTypeCount,
        AVG(TRY_CONVERT(decimal(18,2), [min_activity_sku_price])) / 100.0 AS avgMinPrice,
        AVG(TRY_CONVERT(decimal(18,2), [max_activity_sku_price])) / 100.0 AS avgMaxPrice,
        MIN(TRY_CONVERT(decimal(18,2), [min_activity_sku_price])) / 100.0 AS globalMinPrice,
        MAX(TRY_CONVERT(decimal(18,2), [max_activity_sku_price])) / 100.0 AS globalMaxPrice
       FROM dbo.pdd_DataActivityRecords
       ${whereSql}`,
      params
    );

    const stats = row || {};
    const totalRecords = Number(stats.totalRecords) || 0;
    const successCount = Number(stats.successCount) || 0;
    const successRate = totalRecords > 0 ? ((successCount / totalRecords) * 100).toFixed(1) : '0.0';

    res.json({
      success: true,
      data: {
        filterDate,
        totalRecords,
        successCount,
        successRate,
        goodsCount: Number(stats.goodsCount) || 0,
        shopCount: Number(stats.shopCount) || 0,
        activityIdCount: Number(stats.activityIdCount) || 0,
        activityTypeCount: Number(stats.activityTypeCount) || 0,
        avgMinPrice: stats.avgMinPrice != null ? Number(stats.avgMinPrice).toFixed(2) : '-',
        avgMaxPrice: stats.avgMaxPrice != null ? Number(stats.avgMaxPrice).toFixed(2) : '-',
        globalMinPrice: stats.globalMinPrice != null ? Number(stats.globalMinPrice).toFixed(2) : '-',
        globalMaxPrice: stats.globalMaxPrice != null ? Number(stats.globalMaxPrice).toFixed(2) : '-',
      },
    });
  } catch (error) {
    console.error('[MarketingEvents] 查询汇总数据失败:', error.message);
    res.status(500).json({ success: false, error: error.message });
  }
});

router.get('/status-counts', async (req, res) => {
  try {
    const result = await jianSunDb.query(
      `SELECT
        [status],
        COUNT(*) AS count
       FROM dbo.pdd_DataActivityRecords
       GROUP BY [status]
       ORDER BY [status]`
    );

    const statusCounts = {};
    let total = 0;
    result.forEach((row) => {
      statusCounts[row.status] = row.count;
      total += row.count;
    });

    res.json({
      success: true,
      data: { all: total, ...statusCounts },
    });
  } catch (error) {
    console.error('[MarketingEvents] 查询状态统计失败:', error.message);
    res.status(500).json({ success: false, error: error.message });
  }
});

module.exports = router;