import React, { useState } from 'react';
import { Link, useNavigate } from 'react-router-dom';
import { useCartStore, type CartItem } from '@/lib/cart/store';
import { useCartSettings } from '@/hooks/useAppearanceSettings';
import { Button } from '@/components/ui/button';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog';
import Container from '@/components/Layout/Container';
import { formatPrice } from '@/lib/currency';
import { Trash2, Plus, Minus, ShoppingBag, ArrowLeft } from 'lucide-react';
import { toast } from 'sonner';

export default function Cart() {
  const navigate = useNavigate();
  const { cart, removeItem, updateQuantity, clearCart } = useCartStore();
  const { layout, elements } = useCartSettings();
  const [showClearDialog, setShowClearDialog] = useState(false);
  
  // Calculate total from items
  const total = cart.items.reduce((sum, item) => sum + (item.price * item.quantity), 0);

  const handleUpdateQuantity = (key: string, newQuantity: number) => {
    if (newQuantity < 1) {
      handleRemoveItem(key);
      return;
    }
    updateQuantity(key, newQuantity);
  };

  const handleRemoveItem = (key: string) => {
    removeItem(key);
    toast.success('Item removed from cart');
  };

  const handleClearCart = () => {
    clearCart();
    setShowClearDialog(false);
    toast.success('Cart cleared');
  };

  if (cart.items.length === 0) {
    return (
      <Container>
        <div className="text-center py-16">
          <ShoppingBag className="mx-auto h-16 w-16 text-gray-400 mb-4" />
          <h2 className="text-2xl font-bold mb-2">Your cart is empty</h2>
          <p className="text-gray-600 mb-6">Add some products to get started!</p>
          <Button onClick={() => navigate('/shop')}>
            <ArrowLeft className="mr-2 h-4 w-4" />
            Continue Shopping
          </Button>
        </div>
      </Container>
    );
  }

  return (
    <Container>
      <div className={`py-8 ${layout.style === 'boxed' ? 'max-w-5xl mx-auto' : ''}`}>
        {/* Header */}
        <div className="flex items-center justify-between mb-8">
          <h1 className="text-3xl font-bold">Shopping Cart</h1>
          <Button variant="outline" onClick={() => setShowClearDialog(true)}>
            <Trash2 className="mr-2 h-4 w-4" />
            Clear Cart
          </Button>
        </div>

        <div className={`grid gap-8 ${layout.summary_position === 'bottom' ? 'grid-cols-1' : 'lg:grid-cols-3'}`}>
          {/* Cart Items */}
          <div className={`space-y-4 ${layout.summary_position === 'bottom' ? '' : 'lg:col-span-2'}`}>
            {cart.items.map((item: CartItem) => (
              <div
                key={item.key}
                className="flex gap-4 p-4 border rounded-lg bg-white"
              >
                {/* Product Image */}
                {elements.product_images && (
                  <div className="relative w-24 h-24 flex-shrink-0 rounded-lg overflow-hidden bg-gray-100">
                    {item.image ? (
                      <img
                        src={item.image}
                        alt={item.name}
                        className="block w-full !h-full object-cover object-center"
                      />
                    ) : (
                      <div className="w-full !h-full flex items-center justify-center text-gray-400 text-xs">
                        No Image
                      </div>
                    )}
                  </div>
                )}

                {/* Product Info */}
                <div className="flex-1 min-w-0">
                  <h3 className="font-semibold text-lg mb-1 truncate">
                    {item.name}
                  </h3>
                  
                  {/* Variation Attributes */}
                  {item.attributes && Object.keys(item.attributes).length > 0 && (
                    <div className="text-sm text-gray-500 mb-1">
                      {Object.entries(item.attributes).map(([key, value]) => {
                        // Format attribute name: capitalize first letter
                        const formattedKey = key.charAt(0).toUpperCase() + key.slice(1);
                        return (
                          <span key={key} className="mr-3">
                            {formattedKey}: <span className="font-medium">{value}</span>
                          </span>
                        );
                      })}
                    </div>
                  )}
                  
                  <p className="text-gray-600 mb-2">
                    {formatPrice(item.price)}
                  </p>

                  {/* Quantity Controls */}
                  <div className="flex items-center gap-2">
                    <button
                      onClick={() => handleUpdateQuantity(item.key, item.quantity - 1)}
                      className="font-[inherit] p-1 hover:bg-gray-100 rounded"
                    >
                      <Minus className="h-4 w-4" />
                    </button>
                    <input
                      type="number"
                      value={item.quantity}
                      onChange={(e) =>
                        handleUpdateQuantity(item.key, parseInt(e.target.value) || 1)
                      }
                      className="w-16 text-center border rounded py-1"
                      min="1"
                    />
                    <button
                      onClick={() => handleUpdateQuantity(item.key, item.quantity + 1)}
                      className="font-[inherit] p-1 hover:bg-gray-100 rounded"
                    >
                      <Plus className="h-4 w-4" />
                    </button>
                  </div>
                </div>

                {/* Item Total & Remove */}
                <div className="flex flex-col items-end justify-between">
                  <button
                    onClick={() => handleRemoveItem(item.key)}
                    className="font-[inherit] text-red-600 hover:text-red-700 p-2"
                  >
                    <Trash2 className="h-5 w-5" />
                  </button>
                  <p className="font-bold text-lg">
                    {formatPrice(item.price * item.quantity)}
                  </p>
                </div>
              </div>
            ))}
          </div>

          {/* Cart Summary */}
          <div className="lg:col-span-1">
            <div className="border rounded-lg p-6 bg-white sticky top-4">
              <h2 className="text-xl font-bold mb-4">Cart Summary</h2>

              {/* Coupon Field */}
              {elements.coupon_field && (
                <div className="mb-6">
                  <label className="block text-sm font-medium mb-2">Coupon Code</label>
                  <div className="flex gap-2">
                    <input
                      type="text"
                      placeholder="Enter coupon code"
                      className="flex-1 px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-primary"
                    />
                    <Button variant="outline" size="sm">Apply</Button>
                  </div>
                </div>
              )}

              {/* Shipping Calculator */}
              {elements.shipping_calculator && (
                <div className="mb-6 p-4 bg-gray-50 rounded-lg">
                  <h3 className="font-medium mb-3">Calculate Shipping</h3>
                  <div className="space-y-2">
                    <input
                      type="text"
                      placeholder="Postal Code"
                      className="w-full px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-primary"
                    />
                    <Button variant="outline" size="sm" className="w-full">Calculate</Button>
                  </div>
                </div>
              )}

              <div className="space-y-3 mb-6">
                <div className="flex justify-between text-gray-600">
                  <span>Subtotal</span>
                  <span>{formatPrice(total)}</span>
                </div>
                <div className="flex justify-between text-gray-600">
                  <span>Shipping</span>
                  <span>Calculated at checkout</span>
                </div>
                <div className="border-t pt-3 flex justify-between text-lg font-bold">
                  <span>Total</span>
                  <span>{formatPrice(total)}</span>
                </div>
              </div>

              <Button
                onClick={() => navigate('/checkout')}
                size="lg"
                className="w-full mb-3"
              >
                Proceed to Checkout
              </Button>

              {elements.continue_shopping_button && (
                <Button
                  onClick={() => navigate('/shop')}
                  variant="outline"
                  className="w-full"
                >
                  <ArrowLeft className="mr-2 h-4 w-4" />
                  Continue Shopping
                </Button>
              )}
            </div>
          </div>
        </div>
      </div>

      {/* Clear Cart Confirmation Dialog */}
      <Dialog open={showClearDialog} onOpenChange={setShowClearDialog}>
        <DialogContent>
          <DialogHeader>
            <DialogTitle>Clear Cart?</DialogTitle>
            <DialogDescription>
              Are you sure you want to remove all items from your cart? This action cannot be undone.
            </DialogDescription>
          </DialogHeader>
          <DialogFooter>
            <Button variant="outline" onClick={() => setShowClearDialog(false)}>
              Cancel
            </Button>
            <Button variant="destructive" onClick={handleClearCart}>
              Clear Cart
            </Button>
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </Container>
  );
}