<template>
  <view class="pay-bridge-page">
    <view class="status-card">
      <text class="eyebrow">支付桥页</text>
      <text class="title">{{ page_title }}</text>
      <text class="desc">
        {{ page_desc }}
      </text>
    </view>

    <view class="info-card">
      <text class="label">订单 ID</text>
      <text class="value">{{ order_id || '暂无' }}</text>
      <text class="label">授权状态</text>
      <text class="value" :class="{ success: is_authed }">
        {{ is_authed ? '已授权' : '未授权' }}
      </text>
      <text class="label">当前状态</text>
      <text class="value">{{ result_text }}</text>
      <text class="label">结果类型</text>
      <text class="value">{{ result_status }}</text>
    </view>

    <view v-if="should_auto_back" class="info-card">
      <text class="label">返回提示</text>
      <text class="value">
        {{ back_countdown > 0 ? `${back_countdown} 秒后自动返回上一页` : '正在返回上一页...' }}
      </text>
    </view>

    <button class="ghost-btn" @tap="goBackNow">立即返回上一页</button>
  </view>
</template>

<script setup>
import { ref, watch, onBeforeUnmount } from 'vue'
import Taro, { useDidShow, useLoad } from '@tarojs/taro'
import { useWechatMiniPay } from '@/composables/useWechatMiniPay'

const order_id = ref('')
const result_text = ref('等待接收支付参数')
const result_status = ref('pending')
const has_started = ref(false)
const should_auto_back = ref(true)
const back_countdown = ref(0)
const back_delay_seconds = ref(2)
const back_mode = ref('navigateBack')
const back_url = ref('/pages/webview-preview/index')
const page_title = ref('正在准备微信支付')
const page_desc = ref('该页面用于承接 WebView/H5 发起的小程序支付请求，支付结束后会返回上一页。')

const {
  is_authed,
  last_result_text,
  pay_by_order_id,
} = useWechatMiniPay()

let back_timer = null

watch(last_result_text, (value) => {
  result_text.value = value
})

const clearBackTimer = () => {
  if (!back_timer) return
  clearInterval(back_timer)
  back_timer = null
}

const goBackNow = async () => {
  clearBackTimer()

  try {
    if (back_mode.value === 'redirectTo' && back_url.value) {
      await Taro.redirectTo({ url: back_url.value })
      return
    }

    if (back_mode.value === 'reLaunch' && back_url.value) {
      await Taro.reLaunch({ url: back_url.value })
      return
    }

    await Taro.navigateBack()
  } catch (error) {
    await Taro.reLaunch({
      url: back_url.value || '/pages/webview-preview/index',
    })
  }
}

const startAutoBack = () => {
  if (!should_auto_back.value) return

  clearBackTimer()
  back_countdown.value = back_delay_seconds.value

  back_timer = setInterval(() => {
    back_countdown.value -= 1

    if (back_countdown.value <= 0) {
      clearBackTimer()
      goBackNow()
    }
  }, 1000)
}

const startPay = async () => {
  if (!order_id.value || has_started.value) return

  has_started.value = true

  const pay_res = await pay_by_order_id(order_id.value, {
    auto_auth: true,
    on_status: (text) => {
      result_text.value = text
    },
  })

  result_status.value = pay_res?.status || 'unknown'

  if (pay_res?.status === 'success') {
    result_text.value = '支付成功，准备返回上一页。'
    page_title.value = '支付已完成'
    page_desc.value = '支付桥页已经完成本次支付，你可以等待自动返回，或手动立即返回。'
  } else if (pay_res?.status === 'cancel') {
    result_text.value = '你已取消支付，准备返回上一页。'
    page_title.value = '支付已取消'
    page_desc.value = '你刚刚取消了本次支付，如需重试，可以重新从 WebView 发起。'
  } else {
    result_text.value = '支付未完成，准备返回上一页。'
    page_title.value = '支付未完成'
    page_desc.value = '本次支付没有完成，你可以返回上一页重新发起，或保留在当前页查看状态。'
  }

  startAutoBack()
}

useLoad((options) => {
  order_id.value = String(options?.order_id || '').trim()
  should_auto_back.value = String(options?.auto_back || '1') !== '0'
  back_mode.value = String(options?.back_mode || 'navigateBack')
  back_url.value = String(options?.back_url || '/pages/webview-preview/index')

  const parsed_back_delay = Number(options?.back_delay || 2)
  back_delay_seconds.value = Number.isFinite(parsed_back_delay) && parsed_back_delay > 0
    ? parsed_back_delay
    : 2

  if (!order_id.value) {
    result_text.value = '缺少订单 ID，无法发起支付。'
    result_status.value = 'invalid'
    page_title.value = '缺少支付参数'
    page_desc.value = '当前页面没有拿到有效的订单 ID，无法继续发起支付。'
    startAutoBack()
  }
})

useDidShow(() => {
  startPay()
})

onBeforeUnmount(() => {
  clearBackTimer()
})
</script>

<style lang="less">
.pay-bridge-page {
  min-height: 100vh;
  padding: 32rpx 24rpx 48rpx;
  box-sizing: border-box;
  background:
    radial-gradient(circle at top right, rgba(15, 118, 110, 0.16), transparent 30%),
    linear-gradient(180deg, #f5fbfa 0%, #edf5f4 100%);
}

.status-card,
.info-card {
  background: rgba(255, 255, 255, 0.94);
  border-radius: 28rpx;
  padding: 32rpx;
  box-sizing: border-box;
  border: 2rpx solid rgba(15, 23, 42, 0.05);
  box-shadow: 0 18rpx 50rpx rgba(15, 23, 42, 0.06);
}

.status-card {
  margin-bottom: 24rpx;
}

.info-card {
  margin-bottom: 24rpx;
}

.eyebrow {
  display: inline-block;
  padding: 8rpx 18rpx;
  border-radius: 999rpx;
  background: #d1fae5;
  color: #065f46;
  font-size: 24rpx;
  font-weight: 600;
}

.title {
  display: block;
  margin-top: 18rpx;
  font-size: 40rpx;
  font-weight: 700;
  color: #111827;
}

.desc {
  display: block;
  margin-top: 16rpx;
  font-size: 26rpx;
  line-height: 1.7;
  color: #6b7280;
}

.label {
  display: block;
  margin-top: 12rpx;
  font-size: 24rpx;
  color: #6b7280;
}

.value {
  display: block;
  margin-top: 8rpx;
  font-size: 30rpx;
  line-height: 1.7;
  color: #111827;
  word-break: break-all;
}

.success {
  color: #047857;
}

.ghost-btn {
  width: 100%;
  border-radius: 999rpx;
  font-size: 30rpx;
  line-height: 88rpx;
  color: #134e4a;
  background: #ffffff;
  border: 2rpx solid #cbd5e1;
}
</style>