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

// GET /api/drops/active - Get the earliest unfilled drop (not sold out)
export async function GET() {
  try {
    // Get all drops ordered by creation date
    const [rows] = await pool.execute(
      'SELECT * FROM drops ORDER BY created_at ASC'
    )
    
    const drops = rows as any[]
    
    // Find the first drop that's not fully sold out
    for (const drop of drops) {
      // Calculate fill from sales records
      // Sales are stored in grams, so we need to convert based on drop unit
      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 not fully sold out
      if (fill < drop.size) {
        // Return drop with calculated fill
        return NextResponse.json({
          ...drop,
          fill: fill,
        })
      }
    }
    
    // No active drops found
    return NextResponse.json(null)
  } catch (error) {
    console.error('Error fetching active drop:', error)
    return NextResponse.json(
      { error: 'Failed to fetch active drop' },
      { status: 500 }
    )
  }
}