<template>
  <div class="space-y-6">
    <!-- Cart Header -->
    <div class="flex items-center justify-between">
      <div>
        <h2 class="text-2xl font-bold text-foreground">Shopping Cart</h2>
        <p class="text-muted-foreground">
          {{ totalCartItems }} items across {{ allStallCarts.length }} stalls
        </p>
      </div>
      
      <div class="flex items-center space-x-4">
        <div class="text-right">
          <p class="text-sm text-muted-foreground">Total Value</p>
          <p class="text-xl font-bold text-green-600">
            {{ formatPrice(totalCartValue, 'sats') }}
          </p>
        </div>
        
        <Button 
          v-if="allStallCarts.length > 0"
          @click="clearAllCarts"
          variant="outline"
          size="sm"
        >
          Clear All
        </Button>
      </div>
    </div>

    <!-- Empty Cart State -->
    <div v-if="allStallCarts.length === 0" class="text-center py-12">
      <ShoppingCart class="mx-auto h-12 w-12 text-muted-foreground/50 mb-4" />
      <h3 class="text-lg font-medium text-foreground mb-2">Your cart is empty</h3>
      <p class="text-muted-foreground mb-6">Start shopping to add items to your cart</p>
      <Button @click="$router.push('/market')" variant="default">
        Continue Shopping
      </Button>
    </div>

    <!-- Stall Carts -->
    <div v-else class="space-y-6">
      <div 
        v-for="cart in allStallCarts" 
        :key="cart.id"
        class="border border-border rounded-lg p-6 bg-card shadow-sm"
      >
        <!-- Stall Header -->
        <div class="flex items-center justify-between mb-4">
          <div class="flex items-center space-x-3">
            <div class="w-10 h-10 bg-primary/10 rounded-full flex items-center justify-center">
              <Store class="w-5 h-5 text-primary" />
            </div>
            <div>
              <h3 class="font-semibold text-foreground">
                {{ getStallName(cart.id) }}
              </h3>
              <p class="text-sm text-muted-foreground">
                {{ cart.products.length }} item{{ cart.products.length !== 1 ? 's' : '' }}
              </p>
            </div>
          </div>
          
          <div class="text-right">
            <p class="text-sm text-muted-foreground">Stall Total</p>
            <p class="text-lg font-semibold text-green-600">
              {{ formatPrice(cart.subtotal, cart.currency) }}
            </p>
          </div>
        </div>

        <!-- Cart Items -->
        <div class="space-y-3 mb-4">
          <CartItem
            v-for="item in cart.products"
            :key="item.product.id"
            :item="item"
            :stall-id="cart.id"
            @update-quantity="updateQuantity"
            @remove-item="removeItem"
          />
        </div>

        <!-- Stall Cart Actions -->
        <div class="pt-4 border-t border-border">
          <!-- Desktop Layout -->
          <div class="hidden md:flex items-center justify-between">
            <div class="flex items-center space-x-4">
              <Button 
                @click="clearStallCart(cart.id)"
                variant="outline"
                size="sm"
              >
                Clear Stall
              </Button>
              
              <Button 
                @click="viewStall(cart.id)"
                variant="ghost"
                size="sm"
              >
                View Stall
              </Button>
            </div>
            
            <div class="flex items-center space-x-3">
              <!-- Cart Summary for this stall -->
              <div class="text-right mr-4">
                <p class="text-sm text-muted-foreground">Total</p>
                <p class="text-lg font-semibold text-green-600">
                  {{ formatPrice(cart.subtotal, cart.currency) }}
                </p>
              </div>
              
              <Button 
                @click="proceedToCheckout(cart.id)"
                :disabled="!canProceedToCheckout(cart.id)"
                variant="default"
              >
                Checkout
                <ArrowRight class="w-4 h-4 ml-2" />
              </Button>
            </div>
          </div>

          <!-- Mobile Layout -->
          <div class="md:hidden space-y-4">
            <!-- Action Buttons Row -->
            <div class="flex items-center justify-between">
              <div class="flex items-center space-x-2">
                <Button 
                  @click="clearStallCart(cart.id)"
                  variant="outline"
                  size="sm"
                >
                  Clear Stall
                </Button>
                
                <Button 
                  @click="viewStall(cart.id)"
                  variant="ghost"
                  size="sm"
                >
                  View Stall
                </Button>
              </div>
            </div>
            
            <!-- Total and Checkout Row -->
            <div class="flex items-center justify-between">
              <!-- Cart Summary for this stall -->
              <div class="text-left">
                <p class="text-sm text-muted-foreground">Total</p>
                <p class="text-lg font-semibold text-green-600">
                  {{ formatPrice(cart.subtotal, cart.currency) }}
                </p>
              </div>
              
              <Button 
                @click="proceedToCheckout(cart.id)"
                :disabled="!canProceedToCheckout(cart.id)"
                variant="default"
                class="flex items-center"
              >
                Checkout
                <ArrowRight class="w-4 h-4 ml-2" />
              </Button>
            </div>
          </div>
        </div>
      </div>
    </div>

    <!-- Continue Shopping Button -->
    <div v-if="allStallCarts.length > 0" class="text-center mt-8">
      <Button @click="$router.push('/market')" variant="outline" size="lg">
        Continue Shopping
      </Button>
    </div>
  </div>
</template>

<script setup lang="ts">
import { computed } from 'vue'
import { useRouter } from 'vue-router'
import { useMarketStore } from '@/stores/market'
import { Button } from '@/components/ui/button'
import { 
  ShoppingCart, 
  Store, 
  ArrowRight 
} from 'lucide-vue-next'
import CartItem from './CartItem.vue'


const router = useRouter()
const marketStore = useMarketStore()

// Computed properties
const allStallCarts = computed(() => marketStore.allStallCarts)
const totalCartItems = computed(() => marketStore.totalCartItems)
const totalCartValue = computed(() => marketStore.totalCartValue)

// Methods
const getStallName = (stallId: string) => {
  const stall = marketStore.stalls.find(s => s.id === stallId)
  return stall?.name || 'Unknown Stall'
}

const updateQuantity = (stallId: string, productId: string, quantity: number) => {
  marketStore.updateStallCartQuantity(stallId, productId, quantity)
}

const removeItem = (stallId: string, productId: string) => {
  marketStore.removeFromStallCart(stallId, productId)
}

const clearStallCart = (stallId: string) => {
  marketStore.clearStallCart(stallId)
}

const clearAllCarts = () => {
  marketStore.clearAllStallCarts()
}

const viewStall = (stallId: string) => {
  // TODO: Navigate to stall page
  console.log('View stall:', stallId)
}

const proceedToCheckout = (stallId: string) => {
  marketStore.setCheckoutCart(stallId)
  router.push(`/checkout/${stallId}`)
}

const canProceedToCheckout = (stallId: string) => {
  const cart = marketStore.stallCarts[stallId]
  return cart && cart.products.length > 0
}

const formatPrice = (price: number, currency: string) => {
  if (currency === 'sats' || currency === 'sat') {
    return `${price.toLocaleString()} sats`
  }
  return new Intl.NumberFormat('en-US', {
    style: 'currency',
    currency: currency.toUpperCase()
  }).format(price)
}
</script>
