import { NextResponse } from 'next/server'
import pool from '@/lib/db'

// GET /api/drops/past - Get all sold-out drops
export async function GET() {
  try {
    // Get all drops
    const [rows] = await pool.execute(
      'SELECT * FROM drops ORDER BY created_at DESC'
    )
    const drops = rows as any[]
    
    // Calculate fill from sales for each drop and filter sold-out ones
    const soldOutDrops = []
    
    for (const drop of drops) {
      // Calculate fill from sales records
      const [salesRows] = await pool.execute(
        'SELECT COALESCE(SUM(size), 0) as total_fill FROM sales WHERE drop_id = ?',
        [drop.id]
      )
      const salesData = salesRows as any[]
      const totalFillInGrams = salesData[0]?.total_fill || 0
      
      // Convert fill to drop's unit for comparison
      let fill = totalFillInGrams
      if (drop.unit === 'kg') {
        fill = totalFillInGrams / 1000
      }
      
      // Check if drop is sold out (fill >= size)
      if (fill >= drop.size) {
        // Get the timestamp of the last sale to calculate "sold out in X hours"
        const [lastSaleRows] = await pool.execute(
          'SELECT created_at FROM sales WHERE drop_id = ? ORDER BY created_at DESC LIMIT 1',
          [drop.id]
        )
        const lastSaleData = lastSaleRows as any[]
        const lastSaleDate = lastSaleData[0]?.created_at || drop.created_at
        
        // Calculate hours between drop creation and last sale
        const dropDate = new Date(drop.created_at)
        const soldOutDate = new Date(lastSaleDate)
        const hoursDiff = Math.round(
          (soldOutDate.getTime() - dropDate.getTime()) / (1000 * 60 * 60)
        )
        
        soldOutDrops.push({
          ...drop,
          fill: fill,
          soldOutInHours: hoursDiff,
        })
      }
    }
    
    return NextResponse.json(soldOutDrops)
  } catch (error) {
    console.error('Error fetching past drops:', error)
    return NextResponse.json(
      { error: 'Failed to fetch past drops' },
      { status: 500 }
    )
  }
}