<template>
  <div class="cart">
    <!-- 页面头部 -->
    <section class="page-header">
      <div class="container">
        <div class="header-content">
          <h1 class="page-title">购物车</h1>
          <p class="page-subtitle">确认您的商品信息</p>
        </div>
      </div>
    </section>

    <div class="container">
      <!-- 购物车内容 -->
      <div v-if="cartItems.length > 0" class="cart-content">
        <!-- 购物车列表 -->
        <div class="cart-list">
          <div class="cart-header">
            <div class="select-all">
              <el-checkbox 
                v-model="selectAll" 
                @change="handleSelectAll"
                :indeterminate="isIndeterminate"
              >
                全选
              </el-checkbox>
            </div>
            <div class="header-labels">
              <span class="product-label">商品信息</span>
              <span class="price-label">单价</span>
              <span class="quantity-label">数量</span>
              <span class="total-label">小计</span>
              <span class="action-label">操作</span>
            </div>
          </div>

          <div class="cart-items">
            <div 
              v-for="item in cartItems" 
              :key="item.id" 
              class="cart-item"
            >
              <div class="item-select">
                <el-checkbox 
                  v-model="item.selected" 
                  @change="updateSelection"
                />
              </div>
              
              <div class="item-product">
                <div class="product-image">
                  <div class="image-placeholder">
                    <svg viewBox="0 0 100 80" width="100%" height="80">
                      <rect width="100" height="80" :fill="item.color" opacity="0.2"/>
                      <circle cx="50" cy="40" r="20" :fill="item.color" opacity="0.5"/>
                      <text x="50" y="45" text-anchor="middle" :fill="item.color" 
                            font-size="10" font-weight="bold">{{ item.name.substring(0, 2) }}</text>
                    </svg>
                  </div>
                </div>
                <div class="product-info">
                  <h3 class="product-name">{{ item.name }}</h3>
                  <p class="product-specs">{{ item.specs || '规格：标准版' }}</p>
                  <p class="product-craftsman" v-if="item.craftsman">
                    <el-icon><User /></el-icon>
                    {{ item.craftsman }}
                  </p>
                </div>
              </div>
              
              <div class="item-price">
                <span class="current-price">¥{{ item.price }}</span>
                <span v-if="item.originalPrice" class="original-price">¥{{ item.originalPrice }}</span>
              </div>
              
              <div class="item-quantity">
                <div class="quantity-controls">
                  <el-button 
                    size="small" 
                    @click="decreaseQuantity(item)" 
                    :disabled="item.quantity <= 1"
                  >
                    -
                  </el-button>
                  <span class="quantity">{{ item.quantity }}</span>
                  <el-button 
                    size="small" 
                    @click="increaseQuantity(item)"
                    :disabled="item.quantity >= item.stock"
                  >
                    +
                  </el-button>
                </div>
                <div class="stock-info">
                  <span class="stock-text">库存{{ item.stock }}件</span>
                </div>
              </div>
              
              <div class="item-total">
                <span class="total-price">¥{{ (item.price * item.quantity).toFixed(2) }}</span>
              </div>
              
              <div class="item-actions">
                <el-button 
                  type="text" 
                  size="small" 
                  @click="removeFromCart(item.id)"
                  class="remove-btn"
                >
                  删除
                </el-button>
              </div>
            </div>
          </div>
        </div>

        <!-- 购物车汇总 -->
        <div class="cart-summary">
          <div class="summary-content">
            <div class="summary-info">
              <div class="selected-count">
                已选择 {{ selectedItems.length }} 件商品
              </div>
              <div class="total-amount">
                <span class="label">合计：</span>
                <span class="amount">¥{{ totalAmount.toFixed(2) }}</span>
              </div>
            </div>
            <div class="summary-actions">
              <el-button 
                type="primary" 
                size="large" 
                :disabled="selectedItems.length === 0"
                @click="checkout"
              >
                结算 ({{ selectedItems.length }})
              </el-button>
            </div>
          </div>
        </div>
      </div>

      <!-- 空购物车 -->
      <div v-else class="empty-cart">
        <div class="empty-icon">
          <el-icon size="80" color="#ddd"><ShoppingCart /></el-icon>
        </div>
        <h3>购物车是空的</h3>
        <p>快去挑选您喜欢的商品吧！</p>
        <el-button type="primary" @click="$router.push('/products')">
          去购物
        </el-button>
      </div>

      <!-- 推荐商品 -->
      <div v-if="cartItems.length > 0" class="recommended-products">
        <h2 class="section-title">为您推荐</h2>
        <div class="products-grid">
          <div 
            v-for="product in recommendedProducts" 
            :key="product.id" 
            class="product-card card"
            @click="$router.push(`/product/${product.id}`)"
          >
            <div class="product-image">
              <div class="image-placeholder">
                <svg viewBox="0 0 200 150" width="100%" height="150">
                  <rect width="200" height="150" :fill="product.color" opacity="0.2"/>
                  <circle cx="100" cy="75" r="30" :fill="product.color" opacity="0.5"/>
                  <text x="100" y="80" text-anchor="middle" :fill="product.color" 
                        font-size="12" font-weight="bold">{{ product.name.substring(0, 2) }}</text>
                </svg>
              </div>
            </div>
            <div class="product-info">
              <h3 class="product-name">{{ product.name }}</h3>
              <div class="product-price">¥{{ product.price }}</div>
              <el-button 
                type="primary" 
                size="small" 
                @click.stop="addRecommendedToCart(product)"
              >
                加入购物车
              </el-button>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup lang="ts">
import { ref, computed, onMounted } from 'vue'
import { useRouter } from 'vue-router'
import { useMainStore } from '../stores'
import { User, ShoppingCart } from '@element-plus/icons-vue'
import { ElMessage, ElMessageBox } from 'element-plus'

const router = useRouter()
const store = useMainStore()

// 响应式数据
const selectAll = ref(false)

// 推荐商品
const recommendedProducts = ref([
  {
    id: 2,
    name: '鄂伦春族刺绣挂画',
    price: 288,
    color: '#2d5016'
  },
  {
    id: 4,
    name: '手工木雕摆件',
    price: 128,
    color: '#8b4513'
  },
  {
    id: 5,
    name: '野生蓝莓干',
    price: 58,
    color: '#2d5016'
  },
  {
    id: 6,
    name: '鄂伦春文化笔记本',
    price: 35,
    color: '#8b4513'
  }
])

// 计算属性
const cartItems = computed(() => {
  return store.cartItems.map(item => ({
    ...item,
    selected: item.selected !== false, // 默认选中
    color: getProductColor(item.id)
  }))
})

const selectedItems = computed(() => {
  return cartItems.value.filter(item => item.selected)
})

const totalAmount = computed(() => {
  return selectedItems.value.reduce((total, item) => {
    return total + (item.price * item.quantity)
  }, 0)
})

const isIndeterminate = computed(() => {
  const selectedCount = selectedItems.value.length
  return selectedCount > 0 && selectedCount < cartItems.value.length
})

// 方法
const getProductColor = (productId: number) => {
  const colors = ['#8b4513', '#2d5016', '#4a5568', '#2d3748']
  return colors[productId % colors.length]
}

const handleSelectAll = (checked: boolean) => {
  cartItems.value.forEach(item => {
    item.selected = checked
  })
  updateCartSelection()
}

const updateSelection = () => {
  const selectedCount = cartItems.value.filter(item => item.selected).length
  selectAll.value = selectedCount === cartItems.value.length
  updateCartSelection()
}

const updateCartSelection = () => {
  // 更新store中的选中状态
  cartItems.value.forEach(item => {
    const storeItem = store.cartItems.find(si => si.id === item.id)
    if (storeItem) {
      storeItem.selected = item.selected
    }
  })
}

const increaseQuantity = (item: any) => {
  if (item.quantity < item.stock) {
    store.updateCartItemQuantity(item.id, item.quantity + 1)
  } else {
    ElMessage.warning('库存不足')
  }
}

const decreaseQuantity = (item: any) => {
  if (item.quantity > 1) {
    store.updateCartItemQuantity(item.id, item.quantity - 1)
  }
}

const removeFromCart = async (itemId: number) => {
  try {
    await ElMessageBox.confirm(
      '确定要删除这件商品吗？',
      '确认删除',
      {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
      }
    )
    
    store.removeFromCart(itemId)
    ElMessage.success('商品已删除')
    
    // 重新计算全选状态
    updateSelection()
  } catch {
    // 用户取消删除
  }
}

const addRecommendedToCart = (product: any) => {
  store.addToCart(product)
  ElMessage.success('已添加到购物车')
}

const checkout = () => {
  if (selectedItems.value.length === 0) {
    ElMessage.warning('请选择要结算的商品')
    return
  }
  
  // 这里应该跳转到结算页面
  ElMessage.success('跳转到结算页面')
  // router.push('/checkout')
}

// 生命周期
onMounted(() => {
  // 初始化选中状态
  updateSelection()
})
</script>

<style scoped>
/* 页面头部 */
.page-header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 3rem 0 2rem;
  text-align: center;
}

.page-title {
  font-size: 2.5rem;
  font-weight: bold;
  margin-bottom: 0.5rem;
}

.page-subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* 购物车内容 */
.cart-content {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2rem;
  margin: 2rem 0;
}

/* 购物车列表 */
.cart-list {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.cart-header {
  background: var(--background-light);
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
}

.select-all {
  width: 120px;
}

.header-labels {
  flex: 1;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 1rem;
  font-weight: 500;
  color: var(--text-color);
}

.cart-items {
  max-height: 600px;
  overflow-y: auto;
}

.cart-item {
  padding: 1.5rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.cart-item:last-child {
  border-bottom: none;
}

.item-select {
  width: 40px;
}

.item-product {
  flex: 2;
  display: flex;
  gap: 1rem;
  align-items: center;
}

.product-image {
  width: 80px;
  height: 80px;
  border-radius: 4px;
  overflow: hidden;
  flex-shrink: 0;
}

.image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--background-light);
}

.product-info {
  flex: 1;
}

.product-name {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.product-specs {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.product-craftsman {
  color: var(--text-light);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.item-price {
  flex: 1;
  text-align: center;
}

.current-price {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--secondary-color);
}

.original-price {
  display: block;
  font-size: 0.9rem;
  color: var(--text-light);
  text-decoration: line-through;
  margin-top: 0.25rem;
}

.item-quantity {
  flex: 1;
  text-align: center;
}

.quantity-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.quantity {
  font-size: 1rem;
  font-weight: 500;
  min-width: 2rem;
  text-align: center;
}

.stock-info {
  font-size: 0.8rem;
  color: var(--text-light);
}

.item-total {
  flex: 1;
  text-align: center;
}

.total-price {
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--secondary-color);
}

.item-actions {
  flex: 1;
  text-align: center;
}

.remove-btn {
  color: var(--danger-color);
}

.remove-btn:hover {
  color: var(--danger-color);
  background: rgba(218, 54, 51, 0.1);
}

/* 购物车汇总 */
.cart-summary {
  position: sticky;
  top: 2rem;
  height: fit-content;
}

.summary-content {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  padding: 1.5rem;
}

.summary-info {
  margin-bottom: 1.5rem;
}

.selected-count {
  color: var(--text-light);
  margin-bottom: 1rem;
}

.total-amount {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.2rem;
}

.total-amount .label {
  color: var(--text-color);
}

.total-amount .amount {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--secondary-color);
}

.summary-actions .el-button {
  width: 100%;
  height: 50px;
  font-size: 1.1rem;
}

/* 空购物车 */
.empty-cart {
  text-align: center;
  padding: 4rem 2rem;
}

.empty-icon {
  margin-bottom: 2rem;
}

.empty-cart h3 {
  font-size: 1.5rem;
  color: var(--text-color);
  margin-bottom: 1rem;
}

.empty-cart p {
  color: var(--text-light);
  margin-bottom: 2rem;
}

/* 推荐商品 */
.recommended-products {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.product-card {
  cursor: pointer;
  transition: all 0.3s ease;
}

.product-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.product-card .product-image {
  width: 100%;
  height: 150px;
  margin-bottom: 1rem;
}

.product-card .product-info {
  padding: 1rem;
}

.product-card .product-name {
  font-size: 1rem;
  font-weight: 500;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.product-card .product-price {
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--secondary-color);
  margin-bottom: 1rem;
}

.product-card .el-button {
  width: 100%;
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .cart-content {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .cart-summary {
    position: static;
  }
}

@media (max-width: 768px) {
  .page-title {
    font-size: 2rem;
  }
  
  .cart-header {
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
  }
  
  .header-labels {
    display: none;
  }
  
  .cart-item {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
  }
  
  .item-select {
    width: auto;
    align-self: flex-start;
  }
  
  .item-product {
    flex-direction: column;
    text-align: center;
  }
  
  .item-price,
  .item-quantity,
  .item-total,
  .item-actions {
    text-align: center;
  }
  
  .quantity-controls {
    justify-content: center;
  }
  
  .products-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  }
}

@media (max-width: 480px) {
  .cart-item {
    padding: 1rem 0.5rem;
  }
  
  .summary-content {
    padding: 1rem;
  }
  
  .products-grid {
    grid-template-columns: 1fr 1fr;
  }
}
</style>