<template>
  <div class="flex min-h-screen items-center justify-center bg-gray-50 px-4 dark:bg-dark-900">
    <div class="w-full max-w-md space-y-6">
      <!-- Loading -->
      <div v-if="loading" class="flex items-center justify-center py-20">
        <div class="h-8 w-8 animate-spin rounded-full border-4 border-primary-500 border-t-transparent"></div>
      </div>
      <template v-else>
        <!-- Status Icon -->
        <div class="text-center">
          <div v-if="isSuccess"
            class="mx-auto flex h-20 w-20 items-center justify-center rounded-full bg-green-100 dark:bg-green-900/30">
            <svg class="h-10 w-10 text-green-500" fill="none" viewBox="0 0 24 24" stroke="currentColor"
              stroke-width="2">
              <path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7" />
            </svg>
          </div>
          <div v-else
            class="mx-auto flex h-20 w-20 items-center justify-center rounded-full bg-red-100 dark:bg-red-900/30">
            <svg class="h-10 w-10 text-red-500" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
              <path stroke-linecap="round" stroke-linejoin="round" d="M6 18L18 6M6 6l12 12" />
            </svg>
          </div>
          <h2 class="mt-4 text-2xl font-bold text-gray-900 dark:text-white">
            {{ isSuccess ? t('payment.result.success') : t('payment.result.failed') }}
          </h2>
        </div>
        <!-- Order Info -->
        <div v-if="order" class="rounded-xl bg-white p-5 shadow-sm dark:bg-dark-800">
          <div class="space-y-3 text-sm">
            <div class="flex justify-between">
              <span class="text-gray-500 dark:text-gray-400">{{ t('payment.orders.orderId') }}</span>
              <span class="font-medium text-gray-900 dark:text-white">#{{ order.id }}</span>
            </div>
            <div v-if="order.out_trade_no" class="flex justify-between">
              <span class="text-gray-500 dark:text-gray-400">{{ t('payment.orders.orderNo') }}</span>
              <span class="font-medium text-gray-900 dark:text-white">{{ order.out_trade_no }}</span>
            </div>
            <div class="flex justify-between">
              <span class="text-gray-500 dark:text-gray-400">{{ t('payment.orders.amount') }}</span>
              <span class="font-medium text-gray-900 dark:text-white">&#165;{{ order.pay_amount.toFixed(2) }}</span>
            </div>
            <div class="flex justify-between">
              <span class="text-gray-500 dark:text-gray-400">{{ t('payment.orders.paymentMethod') }}</span>
              <span class="font-medium text-gray-900 dark:text-white">{{ t('payment.methods.' + order.payment_type, order.payment_type) }}</span>
            </div>
            <div class="flex justify-between">
              <span class="text-gray-500 dark:text-gray-400">{{ t('payment.orders.status') }}</span>
              <OrderStatusBadge :status="order.status" />
            </div>
          </div>
        </div>
        <!-- EasyPay return info (when no order loaded) -->
        <div v-else-if="returnInfo" class="rounded-xl bg-white p-5 shadow-sm dark:bg-dark-800">
          <div class="space-y-3 text-sm">
            <div v-if="returnInfo.outTradeNo" class="flex justify-between">
              <span class="text-gray-500 dark:text-gray-400">{{ t('payment.orders.orderId') }}</span>
              <span class="font-medium text-gray-900 dark:text-white">{{ returnInfo.outTradeNo }}</span>
            </div>
            <div v-if="returnInfo.money" class="flex justify-between">
              <span class="text-gray-500 dark:text-gray-400">{{ t('payment.orders.amount') }}</span>
              <span class="font-medium text-gray-900 dark:text-white">&#165;{{ returnInfo.money }}</span>
            </div>
            <div v-if="returnInfo.type" class="flex justify-between">
              <span class="text-gray-500 dark:text-gray-400">{{ t('payment.orders.paymentMethod') }}</span>
              <span class="font-medium text-gray-900 dark:text-white">{{ t('payment.methods.' + returnInfo.type, returnInfo.type) }}</span>
            </div>
          </div>
        </div>
        <!-- Actions -->
        <div class="flex gap-3">
          <button class="btn btn-secondary flex-1" @click="router.push('/purchase')">{{ t('payment.result.backToRecharge') }}</button>
          <button class="btn btn-primary flex-1" @click="router.push('/orders')">{{ t('payment.result.viewOrders') }}</button>
        </div>
      </template>
    </div>
  </div>
</template>

<script setup lang="ts">
import { ref, computed, onMounted } from 'vue'
import { useI18n } from 'vue-i18n'
import { useRoute, useRouter } from 'vue-router'
import OrderStatusBadge from '@/components/payment/OrderStatusBadge.vue'
import { usePaymentStore } from '@/stores/payment'
import { paymentAPI } from '@/api/payment'
import type { PaymentOrder } from '@/types/payment'

const { t } = useI18n()
const route = useRoute()
const router = useRouter()
const paymentStore = usePaymentStore()

const order = ref<PaymentOrder | null>(null)
const loading = ref(true)

interface ReturnInfo {
  outTradeNo: string
  money: string
  type: string
  tradeStatus: string
}
const returnInfo = ref<ReturnInfo | null>(null)

const isSuccess = computed(() => {
  // Always prioritize actual order status from backend
  if (order.value) {
    return order.value.status === 'COMPLETED' || order.value.status === 'PAID'
  }
  // Fallback only when order not loaded
  if (route.query.status === 'success') return true
  if (route.query.trade_status === 'TRADE_SUCCESS') return true
  return false
})

/** Extract numeric order ID from out_trade_no like "sub2_46" → 46 */
function parseOutTradeNo(outTradeNo: string): number {
  const match = outTradeNo.match(/_(\d+)$/)
  return match ? Number(match[1]) : 0
}

onMounted(async () => {
  // Try order_id first (internal navigation from QRCode/Stripe pages)
  let orderId = Number(route.query.order_id) || 0
  const outTradeNo = String(route.query.out_trade_no || '')

  // Fallback: EasyPay return URL with out_trade_no
  if (!orderId && outTradeNo) {
    orderId = parseOutTradeNo(outTradeNo)
    // Store return info for display when order lookup fails
    returnInfo.value = {
      outTradeNo,
      money: String(route.query.money || ''),
      type: String(route.query.type || ''),
      tradeStatus: String(route.query.trade_status || ''),
    }
  }

  // If we have an out_trade_no from a provider return URL, actively verify
  // the payment with the upstream provider (handles missed notify callbacks)
  if (outTradeNo) {
    try {
      const result = await paymentAPI.verifyOrder(outTradeNo)
      order.value = result.data
    } catch (_err: unknown) {
      // Verification failed, fall through to normal order lookup
    }
  }

  // Normal order lookup by ID (if verify didn't load the order)
  if (!order.value && orderId) {
    try {
      order.value = await paymentStore.pollOrderStatus(orderId)
    } catch (_err: unknown) {
      // Order lookup failed, will show returnInfo fallback
    }
  }
  loading.value = false
})
</script>
