Sticky Cart

import { Button } from '@/components/ui/button';
import {
  Card,
  CardContent,
  CardFooter,
  CardHeader,
  CardTitle,
} from '@/components/ui/card';
import {
  ShoppingCart,
  Trash2,
  Plus,
  Minus,
  CreditCard,
  Package,
  ChevronUp,
  ChevronDown,
} from 'lucide-react';
import { useState } from 'react';
import { Badge } from '@/components/ui/badge';
import { Separator } from '@/components/ui/separator';

interface CartItem {
  id: string;
  name: string;
  price: number;
  originalPrice?: number;
  quantity: number;
  image: string;
  color: string;
  size: string;
  stock: number;
}

export default function StickyCart() {
  const [items, setItems] = useState<CartItem[]>([
    {
      id: '1',
      name: 'Classic Chronograph Watch',
      price: 299.99,
      originalPrice: 399.99,
      quantity: 1,
      image: 'https://images.unsplash.com/photo-1523275335684-37898b6baf30',
      color: 'Black',
      size: 'Standard',
      stock: 5,
    },
    {
      id: '2',
      name: 'Sport Diver Watch',
      price: 199.99,
      quantity: 2,
      image: 'https://images.unsplash.com/photo-1523275335684-37898b6baf30',
      color: 'Blue',
      size: 'Standard',
      stock: 3,
    },
  ]);

  const [isExpanded, setIsExpanded] = useState(true);

  const subtotal = items.reduce(
    (sum, item) => sum + item.price * item.quantity,
    0
  );
  const shipping = subtotal > 200 ? 0 : 5.99;
  const total = subtotal + shipping;

  const updateQuantity = (id: string, change: number) => {
    setItems((prev) =>
      prev.map((item) => {
        if (item.id === id) {
          const newQuantity = Math.max(
            1,
            Math.min(item.stock, item.quantity + change)
          );
          return { ...item, quantity: newQuantity };
        }
        return item;
      })
    );
  };

  const removeItem = (id: string) => {
    setItems((prev) => prev.filter((item) => item.id !== id));
  };

  const totalItems = items.reduce((sum, item) => sum + item.quantity, 0);

  return (
    <>
      {/* Height set for example purpose only */}
      <div className="relative h-[650px] p-6">
        {/* Main content would go here */}
        <div className="text-muted-foreground py-20 text-center">
          Main page content
        </div>

        {/* Sticky Cart */}
        <div className="bg-background fixed right-0 bottom-0 left-0 z-40 border-t shadow-lg">
          {/* Cart Header - Always Visible */}
          <div
            className="flex cursor-pointer items-center justify-between p-4"
            onClick={() => setIsExpanded(!isExpanded)}
          >
            <div className="flex items-center gap-3">
              <div className="relative">
                <ShoppingCart className="h-5 w-5" />
                {items.length > 0 && (
                  <Badge
                    variant="destructive"
                    className="absolute -top-2 -right-2 flex h-5 w-5 items-center justify-center p-0"
                  >
                    {totalItems}
                  </Badge>
                )}
              </div>
              <div>
                <span className="font-medium">Your Cart</span>
                <span className="text-muted-foreground ml-2 text-sm">
                  (${total.toFixed(2)})
                </span>
              </div>
            </div>

            <div className="flex items-center gap-4">
              <Button size="sm" className="hidden sm:flex">
                <CreditCard className="mr-2 h-4 w-4" />
                Checkout
              </Button>
              {isExpanded ? (
                <ChevronDown className="h-5 w-5" />
              ) : (
                <ChevronUp className="h-5 w-5" />
              )}
            </div>
          </div>

          {/* Expandable Cart Content */}
          {isExpanded && (
            <div className="border-t p-4 pt-0">
              <div className="grid grid-cols-1 gap-6 md:grid-cols-3">
                {/* Cart Items */}
                <div className="md:col-span-2">
                  <div className="max-h-[300px] space-y-3 overflow-y-auto">
                    {items.map((item) => (
                      <div
                        key={item.id}
                        className="flex gap-3 border-b py-3 last:border-0"
                      >
                        {/* Product Image */}
                        <div className="relative h-16 w-16 flex-shrink-0 overflow-hidden rounded-md">
                          <img
                            src={item.image}
                            alt={item.name}
                            className="object-cover"
                            sizes="64px"
                          />
                        </div>

                        {/* Product Details */}
                        <div className="min-w-0 flex-1">
                          <div className="flex justify-between">
                            <div>
                              <h3 className="truncate pr-6 text-sm font-medium">
                                {item.name}
                              </h3>
                              <p className="text-muted-foreground text-xs">
                                {item.color} • {item.size}
                              </p>
                            </div>
                            <Button
                              variant="ghost"
                              size="icon"
                              className="h-7 w-7"
                              onClick={() => removeItem(item.id)}
                            >
                              <Trash2 className="h-4 w-4" />
                            </Button>
                          </div>

                          <div className="mt-2 flex items-center justify-between">
                            <div className="flex items-center gap-1">
                              <Button
                                variant="outline"
                                size="icon"
                                className="h-7 w-7"
                                onClick={() => updateQuantity(item.id, -1)}
                              >
                                <Minus className="h-3 w-3" />
                              </Button>
                              <span className="w-7 text-center text-sm">
                                {item.quantity}
                              </span>
                              <Button
                                variant="outline"
                                size="icon"
                                className="h-7 w-7"
                                onClick={() => updateQuantity(item.id, 1)}
                              >
                                <Plus className="h-3 w-3" />
                              </Button>
                            </div>

                            <div className="text-right">
                              <div className="text-sm font-medium">
                                ${(item.price * item.quantity).toFixed(2)}
                              </div>
                              {item.originalPrice && (
                                <div className="text-muted-foreground text-xs line-through">
                                  $
                                  {(item.originalPrice * item.quantity).toFixed(
                                    2
                                  )}
                                </div>
                              )}
                            </div>
                          </div>
                        </div>
                      </div>
                    ))}
                  </div>
                </div>

                {/* Order Summary */}
                <div className="space-y-4">
                  <Card>
                    <CardHeader className="pb-2">
                      <CardTitle className="text-lg">Order Summary</CardTitle>
                    </CardHeader>
                    <CardContent className="space-y-3">
                      <div className="flex justify-between text-sm">
                        <span>Subtotal</span>
                        <span>${subtotal.toFixed(2)}</span>
                      </div>
                      <div className="flex justify-between text-sm">
                        <span>Shipping</span>
                        <span>
                          {shipping === 0 ? 'Free' : `$${shipping.toFixed(2)}`}
                        </span>
                      </div>
                      <Separator />
                      <div className="flex justify-between font-medium">
                        <span>Total</span>
                        <span>${total.toFixed(2)}</span>
                      </div>

                      <div className="text-muted-foreground mt-2 flex items-center gap-2 text-xs">
                        <Package className="h-3 w-3" />
                        <span>Free shipping on orders over $200</span>
                      </div>
                    </CardContent>
                    <CardFooter>
                      <Button className="w-full">
                        <CreditCard className="mr-2 h-4 w-4" />
                        Checkout
                      </Button>
                    </CardFooter>
                  </Card>
                </div>
              </div>
            </div>
          )}
        </div>
      </div>
    </>
  );
}