import React, { useEffect, useState } from 'react';
import { useParams, Link, useSearchParams } from 'react-router-dom';
import { useThankYouSettings } from '@/hooks/useAppearanceSettings';
import { useTheme } from '@/contexts/ThemeContext';
import Container from '@/components/Layout/Container';
import SEOHead from '@/components/SEOHead';
import { CheckCircle, ShoppingBag, Package, Truck, User, LogIn } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { formatPrice } from '@/lib/currency';
import { apiClient } from '@/lib/api/client';

export default function ThankYou() {
  const { orderId } = useParams<{ orderId: string }>();
  const [searchParams] = useSearchParams();
  const orderKey = searchParams.get('key');
  const { template, backgroundColor, customMessage, elements, isLoading: settingsLoading } = useThankYouSettings();
  const { colorMode } = useTheme();
  const [order, setOrder] = useState<any>(null);
  const [relatedProducts, setRelatedProducts] = useState<any[]>([]);
  const [loading, setLoading] = useState(true);
  const [, setError] = useState<string | null>(null);
  const isLoggedIn = (window as any).woonoowCustomer?.user?.isLoggedIn;

  useEffect(() => {
    const fetchOrderData = async () => {
      if (!orderId) return;

      try {
        // Use public order endpoint with key validation
        const keyParam = orderKey ? `?key=${orderKey}` : '';
        const orderData = await apiClient.get(`/checkout/order/${orderId}${keyParam}`) as any;
        setOrder(orderData);

        // Fetch related products from first order item
        if (orderData.items && orderData.items.length > 0) {
          const firstProductId = orderData.items[0].product_id;
          const productData = await apiClient.get(`/shop/products/${firstProductId}`) as any;
          if (productData.related_products && productData.related_products.length > 0) {
            setRelatedProducts(productData.related_products.slice(0, 4));
          }
        }
      } catch (err: any) {
        console.error('Failed to fetch order data:', err);
        setError(err.message || 'Failed to load order');
      } finally {
        setLoading(false);
      }
    };

    fetchOrderData();
  }, [orderId, orderKey]);

  if (loading || settingsLoading || !order) {
    return (
      <Container>
        <div className="py-20 text-center">
          <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-gray-900 mx-auto"></div>
        </div>
      </Container>
    );
  }

  const getStatusLabel = (status: string) => {
    const statusMap: Record<string, string> = {
      'pending': 'Pending Payment',
      'processing': 'Processing',
      'on-hold': 'On Hold',
      'completed': 'Completed',
      'cancelled': 'Cancelled',
      'refunded': 'Refunded',
      'failed': 'Failed',
    };
    return statusMap[status] || status.charAt(0).toUpperCase() + status.slice(1);
  };

  // Render receipt style template
  if (template === 'receipt') {
    return (
      <div style={colorMode === 'dark' ? undefined : { backgroundColor }} className="min-h-screen dark:bg-background">
        <SEOHead title="Order Confirmed" description={`Order #${order?.number || orderId} confirmed`} />
        <Container>
          <div className="py-12 max-w-2xl mx-auto">
            {/* Receipt Container */}
            <div className="bg-white shadow-lg" style={{ fontFamily: 'monospace' }}>
              {/* Receipt Header */}
              <div className="border-b-2 border-dashed border-gray-400 p-8 text-center">
                <div className="inline-flex items-center justify-center w-20 h-20 bg-green-100 rounded-full mb-4">
                  <CheckCircle className="w-10 h-10 text-green-600" />
                </div>
                <h1 className="text-2xl font-bold mb-2">PAYMENT RECEIPT</h1>
                <p className="text-gray-600">Order #{order.number}</p>
                <p className="text-sm text-gray-500 mt-1">
                  {new Date().toLocaleDateString('en-US', {
                    year: 'numeric',
                    month: 'long',
                    day: 'numeric',
                    hour: '2-digit',
                    minute: '2-digit'
                  })}
                </p>
              </div>

              {/* Custom Message */}
              <div className="px-8 py-4 bg-gray-50 dark:bg-blue-900/20 border-b border-dashed border-gray-300 dark:border-blue-800/50">
                <p className="text-sm text-center text-gray-700 dark:text-blue-100">{customMessage}</p>
              </div>

              {/* Order Items */}
              {elements.order_details && (
                <div className="p-8">
                  <div className="border-b-2 border-gray-900 pb-2 mb-4">
                    <div className="flex justify-between text-sm font-bold">
                      <span>ITEM</span>
                      <span>AMOUNT</span>
                    </div>
                  </div>

                  <div className="space-y-3">
                    {order.items.map((item: any) => (
                      <div key={item.id}>
                        <div className="flex justify-between">
                          <div className="flex-1">
                            <div className="font-medium">{item.name}</div>
                            <div className="text-sm text-gray-600">Qty: {item.qty}</div>
                          </div>
                          <div className="text-right font-mono">
                            {formatPrice(item.total)}
                          </div>
                        </div>
                      </div>
                    ))}
                  </div>

                  {/* Totals */}
                  <div className="border-t-2 border-dashed border-gray-400 mt-6 pt-4 space-y-2">
                    <div className="flex justify-between text-sm">
                      <span>SUBTOTAL:</span>
                      <span className="font-mono">{formatPrice(parseFloat(order.subtotal || 0))}</span>
                    </div>
                    {parseFloat(order.shipping_total || 0) > 0 && (
                      <div className="flex justify-between text-sm">
                        <span>SHIPPING:</span>
                        <span className="font-mono">{formatPrice(parseFloat(order.shipping_total))}</span>
                      </div>
                    )}
                    {parseFloat(order.tax_total || 0) > 0 && (
                      <div className="flex justify-between text-sm">
                        <span>TAX:</span>
                        <span className="font-mono">{formatPrice(parseFloat(order.tax_total))}</span>
                      </div>
                    )}
                    {parseFloat(order.discount_total || 0) > 0 && (
                      <div className="flex justify-between text-sm text-green-600">
                        <span>DISCOUNT:</span>
                        <span className="font-mono">-{formatPrice(parseFloat(order.discount_total))}</span>
                      </div>
                    )}
                    <div className="flex justify-between text-lg font-bold border-t-2 border-gray-900 pt-2 mt-2">
                      <span>TOTAL:</span>
                      <span className="font-mono">{formatPrice(parseFloat(order.total || 0))}</span>
                    </div>
                  </div>

                  {/* Payment & Status Info */}
                  <div className="border-t-2 border-dashed border-gray-400 mt-6 pt-4 space-y-2 text-sm">
                    <div className="flex justify-between">
                      <span className="text-gray-600">Payment Method:</span>
                      <span className="font-medium uppercase">{order.payment_method || 'N/A'}</span>
                    </div>
                    <div className="flex justify-between">
                      <span className="text-gray-600">Status:</span>
                      <span className="font-medium uppercase">{getStatusLabel(order.status)}</span>
                    </div>
                  </div>

                  {/* Customer Info */}
                  <div className="border-t-2 border-dashed border-gray-400 mt-6 pt-4">
                    <div className="text-xs text-gray-600 uppercase mb-2">Bill To:</div>
                    <div className="text-sm">
                      <div className="font-medium">
                        {order.billing?.first_name} {order.billing?.last_name}
                      </div>
                      <div className="text-gray-600">{order.billing?.email}</div>
                      {order.billing?.phone && (
                        <div className="text-gray-600">{order.billing.phone}</div>
                      )}
                    </div>
                  </div>
                </div>
              )}

              {/* Receipt Footer */}
              <div className="border-t-2 border-dashed border-gray-400 p-8 text-center bg-gray-50">
                <p className="text-sm text-gray-600 mb-4">
                  {order.status === 'pending'
                    ? 'Awaiting payment confirmation'
                    : 'Thank you for your business!'}
                </p>

                <div className="flex flex-col sm:flex-row gap-3 justify-center">
                  {elements.continue_shopping_button && (
                    <Link to="/shop">
                      <Button size="lg" className="gap-2">
                        <ShoppingBag className="w-5 h-5" />
                        Continue Shopping
                      </Button>
                    </Link>
                  )}
                  {isLoggedIn ? (
                    <Link to="/my-account">
                      <Button size="lg" variant="outline" className="gap-2">
                        <User className="w-5 h-5" />
                        Go to Account
                      </Button>
                    </Link>
                  ) : (
                    <Link to="/login">
                      <Button size="lg" variant="outline" className="gap-2">
                        <LogIn className="w-5 h-5" />
                        Login / Create Account
                      </Button>
                    </Link>
                  )}
                </div>
              </div>
            </div>

            {/* Related Products */}
            {elements.related_products && relatedProducts.length > 0 && (
              <div className="mt-12">
                <h2 className="text-2xl font-bold mb-6">You May Also Like</h2>
                <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
                  {relatedProducts.map((product: any) => (
                    <Link key={product.id} to={`/product/${product.slug}`} className="group no-underline">
                      <div className="bg-white border rounded-lg overflow-hidden hover:shadow-lg transition-shadow">
                        <div className="aspect-square bg-gray-100 flex items-center justify-center">
                          {product.image ? (
                            <img src={product.image} alt={product.name} className="w-full !h-full object-cover" />
                          ) : (
                            <Package className="w-12 h-12 text-gray-400" />
                          )}
                        </div>
                        <div className="p-3">
                          <h3 className="font-medium text-sm text-gray-900 group-hover:text-blue-600 transition-colors line-clamp-2">
                            {product.name}
                          </h3>
                          <p className="text-sm font-bold text-gray-900 mt-1">
                            {formatPrice(parseFloat(product.price || 0))}
                          </p>
                        </div>
                      </div>
                    </Link>
                  ))}
                </div>

                {/* Totals */}
                <div className="border-t-2 border-dashed border-gray-400 mt-6 pt-4 space-y-2">
                  <div className="flex justify-between text-sm">
                    <span>SUBTOTAL:</span>
                    <span className="font-mono">{formatPrice(parseFloat(order.subtotal || 0))}</span>
                  </div>
                  {parseFloat(order.shipping_total || 0) > 0 && (
                    <div className="flex justify-between text-sm">
                      <span>SHIPPING:</span>
                      <span className="font-mono">{formatPrice(parseFloat(order.shipping_total))}</span>
                    </div>
                  )}
                  {parseFloat(order.tax_total || 0) > 0 && (
                    <div className="flex justify-between text-sm">
                      <span>TAX:</span>
                      <span className="font-mono">{formatPrice(parseFloat(order.tax_total))}</span>
                    </div>
                  )}
                  {parseFloat(order.discount_total || 0) > 0 && (
                    <div className="flex justify-between text-sm text-green-600">
                      <span>DISCOUNT:</span>
                      <span className="font-mono">-{formatPrice(parseFloat(order.discount_total))}</span>
                    </div>
                  )}
                  <div className="flex justify-between text-lg font-bold border-t-2 border-gray-900 pt-2 mt-2">
                    <span>TOTAL:</span>
                    <span className="font-mono">{formatPrice(parseFloat(order.total || 0))}</span>
                  </div>
                </div>

                {/* Payment & Status Info */}
                <div className="border-t-2 border-dashed border-gray-400 mt-6 pt-4 space-y-2 text-sm">
                  <div className="flex justify-between">
                    <span className="text-gray-600">Payment Method:</span>
                    <span className="font-medium uppercase">{order.payment_method || 'N/A'}</span>
                  </div>
                  <div className="flex justify-between">
                    <span className="text-gray-600">Status:</span>
                    <span className="font-medium uppercase">{getStatusLabel(order.status)}</span>
                  </div>
                </div>

                {/* Customer Info */}
                <div className="border-t-2 border-dashed border-gray-400 mt-6 pt-4">
                  <div className="text-xs text-gray-600 uppercase mb-2">Bill To:</div>
                  <div className="text-sm">
                    <div className="font-medium">
                      {order.billing?.first_name} {order.billing?.last_name}
                    </div>
                    <div className="text-gray-600">{order.billing?.email}</div>
                    {order.billing?.phone && (
                      <div className="text-gray-600">{order.billing.phone}</div>
                    )}
                  </div>
                </div>
              </div>
            )}

            {/* Receipt Footer */}
            <div className="border-t-2 border-dashed border-gray-400 p-8 text-center bg-gray-50">
              <p className="text-sm text-gray-600 mb-4">
                {order.status === 'pending'
                  ? 'Awaiting payment confirmation'
                  : 'Thank you for your business!'}
              </p>

              {elements.continue_shopping_button && (
                <Link to="/shop">
                  <Button size="lg" className="gap-2">
                    <ShoppingBag className="w-5 h-5" />
                    Continue Shopping
                  </Button>
                </Link>
              )}
            </div>
          </div>

          {/* Related Products */}
          {elements.related_products && relatedProducts.length > 0 && (
            <div className="mt-12">
              <h2 className="text-2xl font-bold mb-6">You May Also Like</h2>
              <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
                {relatedProducts.map((product: any) => (
                  <Link key={product.id} to={`/product/${product.slug}`} className="group no-underline">
                    <div className="bg-white border rounded-lg overflow-hidden hover:shadow-lg transition-shadow">
                      <div className="aspect-square bg-gray-100 flex items-center justify-center">
                        {product.image ? (
                          <img src={product.image} alt={product.name} className="w-full !h-full object-cover" />
                        ) : (
                          <Package className="w-12 h-12 text-gray-400" />
                        )}
                      </div>
                      <div className="p-3">
                        <h3 className="font-medium text-sm text-gray-900 group-hover:text-blue-600 transition-colors line-clamp-2">
                          {product.name}
                        </h3>
                        <p className="text-sm font-bold text-gray-900 mt-1">
                          {formatPrice(parseFloat(product.price || 0))}
                        </p>
                      </div>
                    </div>
                  </Link>
                ))}
              </div>
            </div>
          )}
        </Container>
      </div>
    );
  }

  // Render basic style template (default)
  return (
    <div style={colorMode === 'dark' ? undefined : { backgroundColor }} className="min-h-screen dark:bg-background">
      <SEOHead title="Order Confirmed" description={`Order #${order?.number || orderId} confirmed`} />
      <Container>
        <div className="py-12 max-w-3xl mx-auto">
          {/* Success Header */}
          <div className="text-center mb-8">
            <div className="inline-flex items-center justify-center w-16 h-16 bg-green-100 rounded-full mb-4">
              <CheckCircle className="w-8 h-8 text-green-600" />
            </div>
            <h1 className="text-3xl font-bold text-gray-900 mb-2">Order Confirmed!</h1>
            <p className="text-gray-600">Order #{order.number}</p>
          </div>

          {/* Custom Message */}
          <div className="bg-blue-50 dark:bg-blue-900/20 border border-blue-200 dark:border-blue-800/50 rounded-lg p-6 mb-8">
            <p className="text-gray-800 dark:text-blue-100 text-center">{customMessage}</p>
          </div>

          {/* Order Details */}
          {elements.order_details && (
            <div className="bg-white border rounded-lg p-6 mb-6">
              <h2 className="text-xl font-bold mb-4">Order Details</h2>

              {/* Order Items */}
              <div className="space-y-4 mb-6">
                {order.items.map((item: any) => (
                  <div key={item.id} className="flex items-center gap-4 pb-4 border-b last:border-0">
                    <div className="w-16 h-16 bg-gray-100 rounded-lg flex items-center justify-center flex-shrink-0">
                      {item.image && typeof item.image === 'string' ? (
                        <img src={item.image} alt={item.name} className="w-full !h-full object-cover rounded-lg" />
                      ) : (
                        <Package className="w-8 h-8 text-gray-400" />
                      )}
                    </div>
                    <div className="flex-1">
                      <h3 className="font-medium text-gray-900">{item.name}</h3>
                      <p className="text-sm text-gray-500">Quantity: {item.qty}</p>
                    </div>
                    <div className="text-right">
                      <p className="font-medium text-gray-900">{formatPrice(item.total)}</p>
                    </div>
                  </div>
                ))}
              </div>

              {/* Order Summary */}
              <div className="border-t pt-4 space-y-2">
                <div className="flex justify-between text-gray-600">
                  <span>Subtotal</span>
                  <span>{formatPrice(parseFloat(order.subtotal || 0))}</span>
                </div>
                {parseFloat(order.shipping_total || 0) > 0 && (
                  <div className="flex justify-between text-gray-600">
                    <span>Shipping</span>
                    <span>{formatPrice(parseFloat(order.shipping_total))}</span>
                  </div>
                )}
                {parseFloat(order.tax_total || 0) > 0 && (
                  <div className="flex justify-between text-gray-600">
                    <span>Tax</span>
                    <span>{formatPrice(parseFloat(order.tax_total))}</span>
                  </div>
                )}
                {parseFloat(order.discount_total || 0) > 0 && (
                  <div className="flex justify-between text-green-600">
                    <span>Discount</span>
                    <span>-{formatPrice(parseFloat(order.discount_total))}</span>
                  </div>
                )}
                <div className="flex justify-between font-bold text-lg text-gray-900 pt-2 border-t">
                  <span>Total</span>
                  <span>{formatPrice(parseFloat(order.total || 0))}</span>
                </div>
              </div>

              {/* Customer Info */}
              <div className="mt-6 pt-6 border-t">
                <h3 className="font-medium text-gray-900 mb-3">Customer Information</h3>
                <div className="grid grid-cols-1 md:grid-cols-2 gap-4 text-sm">
                  <div>
                    <p className="text-gray-500 mb-1">Email</p>
                    <p className="text-gray-900">{order.billing?.email || 'N/A'}</p>
                  </div>
                  <div>
                    <p className="text-gray-500 mb-1">Phone</p>
                    <p className="text-gray-900">{order.billing?.phone || 'N/A'}</p>
                  </div>
                </div>
              </div>

              {/* Order Status */}
              <div className="mt-6 pt-6 border-t">
                <div className="flex items-center gap-3">
                  <Truck className="w-5 h-5 text-blue-600" />
                  <div>
                    <p className="font-medium text-gray-900">Order Status: {getStatusLabel(order.status)}</p>
                    <p className="text-sm text-gray-500">
                      {order.status === 'pending' ? 'Awaiting payment confirmation' : "We'll send you shipping updates via email"}
                    </p>
                  </div>
                </div>
              </div>
            </div>
          )}

          {/* Action Buttons */}
          <div className="text-center flex flex-col sm:flex-row gap-3 justify-center">
            {elements.continue_shopping_button && (
              <Link to="/shop">
                <Button size="lg" className="gap-2">
                  <ShoppingBag className="w-5 h-5" />
                  Continue Shopping
                </Button>
              </Link>
            )}
            {isLoggedIn ? (
              <Link to="/my-account">
                <Button size="lg" variant="outline" className="gap-2">
                  <User className="w-5 h-5" />
                  Go to Account
                </Button>
              </Link>
            ) : (
              <Link to="/login">
                <Button size="lg" variant="outline" className="gap-2">
                  <LogIn className="w-5 h-5" />
                  Login / Create Account
                </Button>
              </Link>
            )}
          </div>

          {/* Related Products */}
          {elements.related_products && relatedProducts.length > 0 && (
            <div className="mt-12">
              <h2 className="text-2xl font-bold mb-6">You May Also Like</h2>
              <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
                {relatedProducts.map((product: any) => (
                  <Link key={product.id} to={`/product/${product.slug}`} className="group no-underline">
                    <div className="bg-white border rounded-lg overflow-hidden hover:shadow-lg transition-shadow">
                      <div className="aspect-square bg-gray-100 flex items-center justify-center">
                        {product.image ? (
                          <img src={product.image} alt={product.name} className="w-full !h-full object-cover" />
                        ) : (
                          <Package className="w-12 h-12 text-gray-400" />
                        )}
                      </div>
                      <div className="p-3">
                        <h3 className="font-medium text-sm text-gray-900 group-hover:text-blue-600 transition-colors line-clamp-2">
                          {product.name}
                        </h3>
                        <p className="text-sm font-bold text-gray-900 mt-1">
                          {formatPrice(parseFloat(product.price || 0))}
                        </p>
                      </div>
                    </div>
                  </Link>
                ))}
              </div>
            </div>
          )}
        </div>
      </Container>
    </div>
  );
}
