import { NextResponse } from 'next/server'
import { auth } from '@/auth'
import { getCreditUsageSummary, getQuotasCompatFromCredits } from '@/lib/credits'

export const dynamic = 'force-dynamic'

export async function GET() {
  const session = await auth()

  if (!session?.user?.id) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
  }

  try {
    const summary = await getCreditUsageSummary(session.user.id)
    // Compat anciens clients : quotas dérivés des crédits
    const quotas = await getQuotasCompatFromCredits(session.user.id)

    return NextResponse.json({
      tier: summary.tier,
      period: summary.period,
      balance: {
        totalRemaining: summary.balance.unlimited
          ? null
          : summary.balance.totalRemaining,
        subscriptionRemaining: summary.balance.unlimited
          ? null
          : summary.balance.subscriptionRemaining,
        purchasedRemaining: summary.balance.purchasedRemaining,
        subscriptionGranted: summary.balance.unlimited
          ? null
          : summary.balance.subscriptionGranted,
        subscriptionSpent: summary.balance.subscriptionSpent,
        spentThisPeriod: summary.balance.spentThisPeriod,
        unlimited: summary.balance.unlimited,
      },
      breakdown: summary.breakdown,
      // legacy
      quotas,
    })
  } catch (error) {
    console.error('[usage/current] Failed to fetch usage data:', error)
    return NextResponse.json(
      { error: 'Failed to fetch usage data' },
      { status: 503 },
    )
  }
}