import { randomUUID } from 'crypto'
import { getSession } from '@/lib/session'
import { getGameCharacters, findCharacterByName } from '@/lib/characters'
import { checkGift } from '@/lib/gift-check'
import {
  priceStoreCart,
  purchaseStoreCart,
  storeEuroTotal,
  createStoreOrder,
  storeConcept,
  giftMail,
  isValidCharName,
  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'
}

/**
 * Envío de un regalo: es la compra de la tienda pero el correo va a OTRO
 * personaje y diciendo quién lo manda. Mismo catálogo y mismo carrito
 * (`priceStoreCart`), así que los precios se recalculan igual contra la BD.
 *
 * A diferencia de la tienda exige, como el original: personaje de origen de tu
 * cuenta, personaje de destino que exista, y token de seguridad.
 */
export async function POST(request: Request) {
  const session = await getSession()
  if (!session.accountId || !session.username) {
    return Response.json({ success: false, error: 'notAuthenticated' }, { status: 401 })
  }

  let body: {
    source?: string
    destination?: string
    items?: StoreCartLine[]
    security_token?: string
    provider?: string
    locale?: string
  } = {}
  try {
    body = await request.json()
  } catch {
    return Response.json({ success: false, error: 'invalidRequest' }, { status: 400 })
  }

  const check = await checkGift(session.accountId, body)
  if ('error' in check) return Response.json({ success: false, error: check.error })
  const { source, destination } = check

  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')
  const mail = giftMail(source)

  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()
    // El pedido se guarda a nombre del DESTINO: es a quien hay que entregarlo
    // cuando la pasarela confirme el pago.
    if (!(await createStoreOrder(ref, session.accountId, destination, 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'
    const productName = storeConcept(cart, {
      bnetEmail: session.bnetEmail,
      account: session.username,
      character: `${source} → ${destination}`,
      ip,
    })
    // `sender` lo necesita la entrega para redactar el correo del regalo.
    const metadata = { service: 'send-gift', order_ref: ref, sender: source }
    const back = `${site}/${safeLocale(body.locale)}/send-gift`

    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: `${site}/service-success?service=send-gift&provider=sumup&ref=${ref}`,
        service: 'send-gift',
        characterName: destination,
        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: destination,
      productName,
      successUrl: `${site}/service-success?service=send-gift&name=${encodeURIComponent(destination)}`,
      cancelUrl: back,
      metadata,
    })
    if (!r.success || !r.url) return Response.json({ success: false, error: 'stripeError' })
    return Response.json({ success: true, url: r.url })
  }

  // Saldo PD/PV: se cobra a TU cuenta y el correo va al personaje de destino.
  const r = await purchaseStoreCart(session.accountId, destination, cart, mail)
  if (!r.success) return Response.json({ success: false, error: r.error })
  return Response.json({ success: true })
}