import { Link, useNavigate } from 'react-router-dom'
import { useCartStore } from '@/store/cart'
import { Button } from '@/components/ui/button'
import { Card, CardContent } from '@/components/ui/card'
import { Minus, Plus, Trash2, ShoppingBag } from 'lucide-react'

function formatPrice(price: number): string {
  return new Intl.NumberFormat('ja-JP', { style: 'currency', currency: 'JPY' }).format(price)
}

export function CartPage() {
  const { items, total, removeItem, updateQuantity } = useCartStore()
  const navigate = useNavigate()

  if (items.length === 0) {
    return (
      <div className="container mx-auto px-4 py-24 text-center">
        <ShoppingBag className="h-16 w-16 mx-auto text-muted-foreground mb-4" />
        <h1 className="text-2xl font-bold mb-2">カートは空です</h1>
        <p className="text-muted-foreground mb-6">Your cart is empty.</p>
        <Link to="/products">
          <Button>商品一覧を見る</Button>
        </Link>
      </div>
    )
  }

  return (
    <div className="container mx-auto px-4 py-10 max-w-3xl">
      <h1 className="text-2xl font-bold mb-8">ショッピングカート</h1>

      <div className="space-y-4 mb-8">
        {items.map(item => (
          <Card key={item.product_id}>
            <CardContent className="p-4 flex items-center gap-4">
              {/* Image */}
              <div className="w-20 h-20 bg-amber-50 rounded-lg overflow-hidden flex-shrink-0 border border-border">
                {item.image ? (
                  <img src={item.image} alt={item.name} className="w-full h-full object-cover" />
                ) : (
                  <div className="w-full h-full flex items-center justify-center text-2xl">🏺</div>
                )}
              </div>

              {/* Info */}
              <div className="flex-1 min-w-0">
                <p className="font-semibold truncate">{item.name}</p>
                <p className="text-primary font-bold mt-1">{formatPrice(item.price)}</p>
              </div>

              {/* Quantity controls */}
              <div className="flex items-center gap-2">
                <Button
                  variant="outline"
                  size="icon"
                  className="h-8 w-8"
                  onClick={() => updateQuantity(item.product_id, item.quantity - 1)}
                >
                  <Minus className="h-3 w-3" />
                </Button>
                <span className="w-8 text-center font-medium">{item.quantity}</span>
                <Button
                  variant="outline"
                  size="icon"
                  className="h-8 w-8"
                  onClick={() => updateQuantity(item.product_id, item.quantity + 1)}
                >
                  <Plus className="h-3 w-3" />
                </Button>
              </div>

              {/* Item total */}
              <div className="w-24 text-right font-bold">
                {formatPrice(item.price * item.quantity)}
              </div>

              {/* Remove */}
              <Button
                variant="ghost"
                size="icon"
                className="h-8 w-8 text-muted-foreground hover:text-destructive"
                onClick={() => removeItem(item.product_id)}
              >
                <Trash2 className="h-4 w-4" />
              </Button>
            </CardContent>
          </Card>
        ))}
      </div>

      {/* Summary */}
      <Card>
        <CardContent className="p-6">
          <div className="flex justify-between items-center text-xl font-bold mb-6">
            <span>合計</span>
            <span className="text-primary">{formatPrice(total)}</span>
          </div>
          <Button
            size="lg"
            className="w-full"
            onClick={() => navigate('/checkout')}
          >
            レジに進む (Proceed to Checkout)
          </Button>
          <div className="mt-3 text-center">
            <Link to="/products" className="text-sm text-muted-foreground hover:text-primary transition-colors">
              買い物を続ける
            </Link>
          </div>
        </CardContent>
      </Card>
    </div>
  )
}