services/controllers/stats.js

const { query } = require('../config/database')

async function getTodayStats(ctx) {
  const today = new Date()
  const todayStart = `${today.getFullYear()}-${String(today.getMonth() + 1).padStart(2, '0')}-${String(today.getDate()).padStart(2, '0')} 00:00:00`
  const todayEnd = `${today.getFullYear()}-${String(today.getMonth() + 1).padStart(2, '0')}-${String(today.getDate()).padStart(2, '0')} 23:59:59`

  const orderResult = await query(
    'SELECT COUNT(*) as orderCount, COALESCE(SUM(total_price), 0) as totalSales FROM orders WHERE created_at >= ? AND created_at <= ? AND status IN ("paid", "completed")',
    [todayStart, todayEnd]
  )

  const customerResult = await query(
    'SELECT COUNT(DISTINCT user_id) as customerCount FROM orders WHERE created_at >= ? AND created_at <= ?',
    [todayStart, todayEnd]
  )

  const stockThreshold = parseInt(process.env.STOCK_WARN_THRESHOLD) || 10
  const lowStockResult = await query(
    'SELECT COUNT(*) as lowStockCount FROM goods WHERE stock < ? AND status != 0',
    [stockThreshold]
  )

  ctx.body = {
    code: 200,
    data: {
      sales: orderResult[0].totalSales,
      orders: orderResult[0].orderCount,
      customers: customerResult[0].customerCount,
      lowStockCount: lowStockResult[0].lowStockCount
    }
  }
}

module.exports = {
  getTodayStats
}