import { NextRequest, NextResponse } from 'next/server'

const BACKEND_URL = process.env.VULA_ECOMMERCE_BACKEND_URL || 'http://vula-ecommerce:9000'
const PUB_KEY     = process.env.NEXT_PUBLIC_MEDUSA_PUBLISHABLE_KEY || ''

let cache: { data: unknown; ts: number } | null = null
const CACHE_TTL = 5 * 60 * 1000 // 5 minutes

export async function GET(req: NextRequest) {
  const limit = Number(req.nextUrl.searchParams.get('limit') ?? '8')
  if (cache && Date.now() - cache.ts < CACHE_TTL) {
    return NextResponse.json(cache.data)
  }
  try {
    const regionRes = await fetch(`${BACKEND_URL}/store/regions?limit=1`, {
      headers: { 'x-publishable-api-key': PUB_KEY }, cache: 'no-store'
    })
    const regionData = regionRes.ok ? await regionRes.json() as { regions?: Array<{ id: string }> } : {}
    const regionId   = regionData.regions?.[0]?.id ?? ''

    const url = new URL(`${BACKEND_URL}/store/products`)
    url.searchParams.set('limit', '100')
    url.searchParams.set('fields', 'id,title,thumbnail,variants,metadata,created_at')
    if (regionId) url.searchParams.set('region_id', regionId)

    const res = await fetch(url.toString(), {
      headers: { 'x-publishable-api-key': PUB_KEY }, cache: 'no-store'
    })
    if (!res.ok) return NextResponse.json({ products: [] }, { status: res.status })

    const data = await res.json() as { products?: Array<{ metadata?: { order_count?: number }; created_at?: string }> }
    const sorted = (data.products ?? [])
      .slice()
      .sort((a, b) => {
        const aScore = (a.metadata?.order_count ?? 0)
        const bScore = (b.metadata?.order_count ?? 0)
        if (bScore !== aScore) return bScore - aScore
        return new Date(b.created_at ?? 0).getTime() - new Date(a.created_at ?? 0).getTime()
      })
      .slice(0, limit)

    const result = { products: sorted }
    cache = { data: result, ts: Date.now() }
    return NextResponse.json(result)
  } catch {
    return NextResponse.json({ products: [] }, { status: 500 })
  }
}