<template>
  <div class="pay-page">
    <!-- 导航栏 -->
    <nav class="navbar">
      <div class="nav-left">
        <el-button 
          type="text" 
          @click="$router.go(-1)"
          class="back-btn"
        >
          <el-icon><ArrowLeft /></el-icon>
        </el-button>
      </div>
      <div class="nav-center">
        <h1 class="nav-title">确认支付</h1>
      </div>
      <div class="nav-right">
      </div>
    </nav>

    <div v-loading="loading" class="page-content">
      <!-- 支付倒计时 -->
      <div class="countdown-section">
        <div class="countdown-header">
          <el-icon class="clock-icon"><Clock /></el-icon>
          <span class="countdown-label">支付剩余时间</span>
        </div>
        <div class="countdown-display">
          <div class="time-block">
            <span class="time-number">{{ formatTime(minutes) }}</span>
            <span class="time-label">分</span>
          </div>
          <div class="time-separator">:</div>
          <div class="time-block">
            <span class="time-number">{{ formatTime(seconds) }}</span>
            <span class="time-label">秒</span>
          </div>
        </div>
        <div class="countdown-tip">
          <span v-if="timeLeft > 0">请在规定时间内完成支付</span>
          <span v-else class="timeout-text">支付超时，请重新下单</span>
        </div>
      </div>

      <!-- 支付金额 -->
      <div class="amount-section">
        <h3 class="section-title">支付金额</h3>
        <div class="amount-display">
          <div class="total-amount-large">
            <span class="currency-symbol">¥</span>
            <span class="amount-number">{{ paymentData.totalAmount || 0 }}</span>
          </div>
          <div class="amount-breakdown" v-if="paymentData.pointsAmount > 0 || paymentData.beansAmount > 0">
            <div v-if="paymentData.pointsAmount > 0" class="breakdown-item">
              <el-icon><Coin /></el-icon>
              <span>积分：{{ paymentData.pointsAmount }}</span>
            </div>
            <div v-if="paymentData.beansAmount > 0" class="breakdown-item">
              <el-icon><Orange /></el-icon>
              <span>融豆：{{ paymentData.beansAmount }}</span>
            </div>
          </div>
        </div>
      </div>

      <!-- 支付方式选择 -->
      <div class="payment-method-section">
        <h3 class="section-title">支付方式</h3>
        <div class="payment-options">
          <div 
            class="payment-option" 
            :class="{ active: selectedPaymentMethod === 'beans' }"
            @click="selectPaymentMethod('beans')"
          >
            <el-icon class="payment-icon"><Orange /></el-icon>
            <div class="payment-info">
              <div class="payment-name">融豆支付</div>
              <div class="payment-desc">使用账户融豆进行支付</div>
            </div>
            <el-icon class="check-icon" v-if="selectedPaymentMethod === 'beans'"><Check /></el-icon>
          </div>
          
          <div 
            class="payment-option" 
            :class="{ active: selectedPaymentMethod === 'points' }"
            @click="selectPaymentMethod('points')"
          >
            <el-icon class="payment-icon"><Coin /></el-icon>
            <div class="payment-info">
              <div class="payment-name">积分支付</div>
              <div class="payment-desc">使用账户积分进行支付</div>
            </div>
            <el-icon class="check-icon" v-if="selectedPaymentMethod === 'points'"><Check /></el-icon>
          </div>
          
          <div 
            class="payment-option" 
            :class="{ active: selectedPaymentMethod === 'mixed' }"
            @click="selectPaymentMethod('mixed')"
          >
            <div class="payment-icon-group">
              <el-icon class="payment-icon"><Coin /></el-icon>
              <span class="plus-sign">+</span>
              <el-icon class="payment-icon"><Orange /></el-icon>
            </div>
            <div class="payment-info">
              <div class="payment-name">积分+融豆</div>
              <div class="payment-desc">使用积分和融豆组合支付</div>
            </div>
            <el-icon class="check-icon" v-if="selectedPaymentMethod === 'mixed'"><Check /></el-icon>
          </div>
        </div>
      </div>
    </div>

    <!-- 底部支付按钮 -->
    <div class="bottom-actions">
      <div class="payment-summary">
        <div class="total-amount">
          <span>实付：</span>
          <span class="amount">¥{{ paymentData.totalAmount || 0 }}</span>
        </div>
      </div>
      <el-button 
        type="primary" 
        size="large"
        class="pay-button"
        @click="confirmPayment"
        :disabled="timeLeft <= 0 || paying || !selectedPaymentMethod"
        :loading="paying"
      >
        {{ timeLeft <= 0 ? '支付超时' : paying ? '支付中...' : '确认支付' }}
      </el-button>
    </div>
  </div>
</template>

<script setup>
import { ref, computed, onMounted, onUnmounted } from 'vue'
import { useRoute, useRouter } from 'vue-router'
import { ElMessage, ElMessageBox } from 'element-plus'
import { 
  ArrowLeft,
  Clock,
  Coin,
  Orange,
  Check
} from '@element-plus/icons-vue'
import api from '@/utils/api'

const route = useRoute()
const router = useRouter()

// 响应式数据
const loading = ref(false)
const paying = ref(false)
const timeLeft = ref(0) // 从后端获取倒计时时间
const timer = ref(null)
const selectedPaymentMethod = ref('') // 当前选择的支付方式
const paymentData = ref({
  totalAmount: 0,
  pointsAmount: 0,
  beansAmount: 0,
  cartId: null
})

// 计算属性
const minutes = computed(() => Math.floor(timeLeft.value / 60))
const seconds = computed(() => timeLeft.value % 60)

// 方法
const formatTime = (time) => {
  return time.toString().padStart(2, '0')
}

const selectPaymentMethod = (method) => {
  selectedPaymentMethod.value = method
}

const startCountdown = () => {
  timer.value = setInterval(() => {
    if (timeLeft.value > 0) {
      timeLeft.value--
    } else {
      clearInterval(timer.value)
      ElMessage.error('支付超时，请重新下单')
    }
  }, 1000)
}

const fetchPaymentData = async () => {
  try {
    loading.value = true
    const cartId = route.query.cartId
    
    if (!cartId) {
      ElMessage.error('缺少购物车信息')
      router.go(-1)
      return
    }
    
    // 获取支付信息
    const response = await api.get(`/payment/info/${cartId}`)
    
    if (response.data.success) {
      const data = response.data.data
      paymentData.value = {
        totalAmount: data.totalAmount || 0,
        pointsAmount: data.pointsAmount || 0,
        beansAmount: data.beansAmount || 0,
        cartId: cartId
      }
      
      // 设置倒计时时间（从后端获取，单位：秒）
      timeLeft.value = data.remainingTime || 900 // 默认15分钟
      
      // 开始倒计时
      startCountdown()
    } else {
      throw new Error(response.data.message || '获取支付信息失败')
    }
  } catch (error) {
    ElMessage.error(error.message || '获取支付信息失败')
    router.go(-1)
  } finally {
    loading.value = false
  }
}

const confirmPayment = async () => {
  if (timeLeft.value <= 0) {
    ElMessage.error('支付超时，请重新下单')
    return
  }

  if (!selectedPaymentMethod.value) {
    ElMessage.error('请选择支付方式')
    return
  }

  try {
    await ElMessageBox.confirm(
      `确定要支付 ¥${paymentData.value.totalAmount} 吗？`,
      '确认支付',
      {
        confirmButtonText: '确定支付',
        cancelButtonText: '取消',
        type: 'warning'
      }
    )

    paying.value = true

    // 构建支付数据
    const submitData = {
      cartId: paymentData.value.cartId,
      paymentMethod: selectedPaymentMethod.value,
      totalAmount: paymentData.value.totalAmount
    }

    // 发送支付请求到后端
    const response = await api.post('/payment/confirm', submitData)
    
    if (response.data.success) {
      ElMessage.success('支付成功！')
      // 清除定时器
      if (timer.value) {
        clearInterval(timer.value)
      }
      // 跳转到订单页面
      router.push('/shop')
    } else {
      throw new Error(response.data.message || '支付失败')
    }
  } catch (error) {
    if (error !== 'cancel') {
      ElMessage.error(error.message || '支付失败，请重试')
    }
  } finally {
    paying.value = false
  }
}

// 生命周期
onMounted(() => {
  fetchPaymentData()
})

onUnmounted(() => {
  if (timer.value) {
    clearInterval(timer.value)
  }
})
</script>

<style scoped>
.pay-page {
  min-height: 100vh;
  background: #f5f5f5;
  display: flex;
  flex-direction: column;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: white;
  border-bottom: 1px solid #eee;
}

.nav-title {
  font-size: 18px;
  font-weight: 500;
  margin: 0;
}

.back-btn {
  color: #333;
  padding: 0;
}

.page-content {
  flex: 1;
  padding: 0;
}

.countdown-section {
  background: white;
  padding: 24px 16px;
  margin-bottom: 8px;
  text-align: center;
}

.countdown-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 16px;
}

.clock-icon {
  color: #ff4757;
  font-size: 18px;
}

.countdown-label {
  font-size: 16px;
  font-weight: 500;
  color: #333;
}

.countdown-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
}

.time-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #ff4757;
  color: white;
  padding: 12px 16px;
  border-radius: 8px;
  min-width: 60px;
}

.time-number {
  font-size: 24px;
  font-weight: bold;
  line-height: 1;
}

.time-label {
  font-size: 12px;
  margin-top: 4px;
}

.time-separator {
  font-size: 24px;
  font-weight: bold;
  color: #ff4757;
}

.countdown-tip {
  font-size: 14px;
  color: #666;
}

.timeout-text {
  color: #ff4757;
  font-weight: 500;
}

.amount-section,
.payment-method-section {
  background: white;
  padding: 16px;
  margin-bottom: 8px;
}

.section-title {
  font-size: 16px;
  font-weight: 500;
  margin: 0 0 12px 0;
  color: #333;
}

.amount-display {
  text-align: center;
  padding: 20px 0;
}

.total-amount-large {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin-bottom: 16px;
}

.currency-symbol {
  font-size: 20px;
  color: #ff4757;
  font-weight: 500;
}

.amount-number {
  font-size: 36px;
  font-weight: bold;
  color: #ff4757;
}

.amount-breakdown {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.breakdown-item {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  color: #666;
  background: #f8f9fa;
  padding: 6px 12px;
  border-radius: 12px;
}

.payment-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.payment-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  border: 1px solid #eee;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.payment-option.active {
  border-color: #ffae00;
  background: #fff7e6;
}

.payment-icon {
  color: #ffae00;
  font-size: 20px;
}

.payment-icon-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.plus-sign {
  font-size: 14px;
  color: #666;
  font-weight: bold;
}

.payment-info {
  flex: 1;
}

.payment-name {
  font-size: 14px;
  font-weight: 500;
  color: #333;
  margin-bottom: 4px;
}

.payment-desc {
  font-size: 12px;
  color: #666;
}

.check-icon {
  color: #ffae00;
  font-size: 18px;
}

.bottom-actions {
  padding: 16px;
  background: white;
  border-top: 1px solid #eee;
  display: flex;
  align-items: center;
  gap: 16px;
}

.payment-info {
  flex: 1;
}

.payment-summary {
  flex: 1;
}

.total-amount {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 16px;
}

.amount {
  color: #ff4757;
  font-size: 18px;
  font-weight: bold;
}

.pay-button {
  min-width: 120px;
  height: 48px;
  background: #ffae00;
  border: none;
  border-radius: 24px;
  font-size: 16px;
  font-weight: 500;
}

.pay-button:hover {
  background: #e69900;
}

.pay-button:disabled {
  background: #ccc;
  cursor: not-allowed;
}
</style>