import { randomUUID } from 'crypto'
import { getSession } from '@/lib/session'
import { getGameCharacters } from '@/lib/characters'
import { getRealmName, realmSlug } from '@/lib/realm'
import { priceStoreCart, purchaseStoreCart, storeEuroTotal, createStoreOrder, storeConcept, type StoreCartLine } from '@/lib/store'
import { CARD_MIN_EUR } from '@/lib/store-pricing'
import { createCheckoutSession } from '@/lib/stripe'
import { createSumUpCheckout, sumupConfigured } from '@/lib/sumup'

function safeLocale(v: unknown): string {
  return v === 'en' ? 'en' : 'es'
}

/**
 * Compra de la tienda. `provider`:
 *  - ausente/'balance' → cobra del saldo PD/PV y envía los ítems al momento.
 *  - 'stripe'/'sumup'  → pago con tarjeta (euros); el pedido se guarda y se
 *    entrega tras confirmarse el pago (webhook/reconciliación).
 * El precio se recalcula siempre en el servidor; nunca se confía en el cliente.
 */
export async function POST(request: Request) {
  const session = await getSession()
  if (!session.accountId || !session.username) {
    return Response.json({ success: false, error: 'notAuthenticated' }, { status: 401 })
  }

  // `items` viene del cliente y NO se cree nada de él salvo los ids y las
  // copias: precios, moneda y lote los relee priceStoreCart de la BD.
  let body: { character?: string; items?: StoreCartLine[]; provider?: string; locale?: string } = {}
  try {
    body = await request.json()
  } catch {
    return Response.json({ success: false, error: 'invalidRequest' }, { status: 400 })
  }

  const character = String(body.character ?? '')
  const chars = await getGameCharacters(session.accountId)
  if (!character || !chars.find((c) => c.name === character)) {
    return Response.json({ success: false, error: 'invalidCharacter' })
  }

  const cart = await priceStoreCart(Array.isArray(body.items) ? body.items : [])
  if (!cart) return Response.json({ success: false, error: 'emptyCart' })

  const provider = String(body.provider ?? 'balance')

  // Pago con tarjeta: guarda el pedido y crea el checkout de la pasarela.
  if (provider === 'stripe' || provider === 'sumup') {
    const amount = storeEuroTotal(cart.pdTotal, cart.vpTotal)
    const minEur = CARD_MIN_EUR[provider]
    if (amount < minEur) return Response.json({ success: false, error: 'amountTooLow', min: minEur })

    const ref = randomUUID()
    if (!(await createStoreOrder(ref, session.accountId, character, cart))) {
      return Response.json({ success: false, error: 'genericError' })
    }

    const site = process.env.SITE_URL || ''
    const ip = (request.headers.get('x-forwarded-for') || '').split(',')[0].trim() || '0.0.0.0'
    // Concepto con quién compra y qué: es lo único que verá la pasarela en su
    // panel para identificar el pago (ver `storeConcept`).
    const productName = storeConcept(cart, {
      bnetEmail: session.bnetEmail,
      account: session.username,
      character,
      ip,
    })
    const metadata = { service: 'store', order_ref: ref }

    if (provider === 'sumup') {
      if (!sumupConfigured()) return Response.json({ success: false, error: 'notConfigured' })
      const r = await createSumUpCheckout({
        accountId: session.accountId,
        username: session.username || '',
        email: session.bnetEmail || '',
        acoreIp: ip,
        amount,
        points: 0,
        reference: ref,
        description: productName,
        returnUrl: `${site}/service-success?service=store&provider=sumup&ref=${ref}`,
        service: 'store',
        characterName: character,
        metadata,
      })
      if (!r.success || !r.url) return Response.json({ success: false, error: r.error || 'sumupError' })
      return Response.json({ success: true, url: r.url })
    }

    const r = await createCheckoutSession({
      accountId: session.accountId,
      username: session.username || '',
      email: session.bnetEmail || '',
      acoreIp: ip,
      amount,
      characterName: character,
      productName,
      successUrl: `${site}/service-success?service=store`,
      cancelUrl: `${site}/${safeLocale(body.locale)}/store-${realmSlug(await getRealmName())}`,
      metadata,
    })
    if (!r.success || !r.url) return Response.json({ success: false, error: 'stripeError' })
    return Response.json({ success: true, url: r.url })
  }

  // Pago con saldo PD/PV: cobra y envía al momento.
  const r = await purchaseStoreCart(session.accountId, character, cart)
  if (!r.success) return Response.json({ success: false, error: r.error })
  return Response.json({ success: true })
}