import { useEffect, useState, useRef } from "react";
import { Button } from "@/components/ui/button";
import { useToast } from "@/hooks/use-toast";
import { Loader2, CreditCard, Check } from "lucide-react";

// PayPal SDK types
declare global {
  interface Window {
    paypal?: any;
  }
}

interface PayPalPaymentProps {
  amount: string;
  currency?: string;
  item: string;
  onPaymentComplete?: (orderId: string) => void;
}

type PaymentMethod = 'paypal' | 'card' | 'ideal';

const PayPalPayment = ({ 
  amount, 
  currency = "EUR",
  item,
  onPaymentComplete 
}: PayPalPaymentProps) => {
  const [sdkReady, setSdkReady] = useState(false);
  const [loading, setLoading] = useState(true);
  const [selectedMethod, setSelectedMethod] = useState<PaymentMethod>('paypal');
  const [paymentComplete, setPaymentComplete] = useState(false);
  const [orderId, setOrderId] = useState<string | null>(null);
  const paypalButtonRef = useRef<HTMLDivElement>(null);
  const cardButtonRef = useRef<HTMLDivElement>(null);
  const idealButtonRef = useRef<HTMLDivElement>(null);
  const { toast } = useToast();

  // Replace with your PayPal Client ID
  // Get one at: https://developer.paypal.com/dashboard/applications
  const PAYPAL_CLIENT_ID = "YOUR_PAYPAL_CLIENT_ID";

  useEffect(() => {
    const loadPayPalSDK = () => {
      if (window.paypal) {
        setSdkReady(true);
        setLoading(false);
        return;
      }

      const script = document.createElement("script");
      script.src = `https://www.paypal.com/sdk/js?client-id=${PAYPAL_CLIENT_ID}&currency=${currency}&components=buttons,funding-eligibility&enable-funding=ideal,card`;
      script.async = true;
      
      script.onload = () => {
        setSdkReady(true);
        setLoading(false);
      };
      
      script.onerror = () => {
        console.error("PayPal SDK failed to load");
        setLoading(false);
        toast({
          title: "Error",
          description: "Failed to load payment system. Check your Client ID.",
          variant: "destructive",
        });
      };

      document.body.appendChild(script);
    };

    loadPayPalSDK();

    return () => {
      // Cleanup if needed
    };
  }, [currency, toast]);

  useEffect(() => {
    if (!sdkReady || !window.paypal || paymentComplete) return;

    const createOrder = (_data: any, actions: any) => {
      return actions.order.create({
        purchase_units: [{
          description: item,
          amount: {
            currency_code: currency,
            value: amount,
          },
        }],
      });
    };

    const onApprove = async (_data: any, actions: any) => {
      try {
        const order = await actions.order.capture();
        console.log("Payment successful:", order);
        
        setPaymentComplete(true);
        setOrderId(order.id);
        
        toast({
          title: "Payment Successful!",
          description: `Order ${order.id} has been confirmed.`,
        });
        
        onPaymentComplete?.(order.id);
      } catch (error) {
        console.error("Payment capture error:", error);
        toast({
          title: "Payment Failed",
          description: "There was an error processing your payment.",
          variant: "destructive",
        });
      }
    };

    const onError = (err: any) => {
      console.error("PayPal error:", err);
      toast({
        title: "Payment Error",
        description: "Something went wrong. Please try again.",
        variant: "destructive",
      });
    };

    // Render PayPal button
    if (paypalButtonRef.current && selectedMethod === 'paypal') {
      paypalButtonRef.current.innerHTML = '';
      window.paypal.Buttons({
        fundingSource: window.paypal.FUNDING.PAYPAL,
        style: {
          layout: 'vertical',
          color: 'black',
          shape: 'rect',
          label: 'paypal',
          height: 40,
        },
        createOrder,
        onApprove,
        onError,
      }).render(paypalButtonRef.current);
    }

    // Render Card button
    if (cardButtonRef.current && selectedMethod === 'card') {
      cardButtonRef.current.innerHTML = '';
      window.paypal.Buttons({
        fundingSource: window.paypal.FUNDING.CARD,
        style: {
          layout: 'vertical',
          color: 'black',
          shape: 'rect',
          height: 40,
        },
        createOrder,
        onApprove,
        onError,
      }).render(cardButtonRef.current);
    }

    // Render iDEAL button (available in Netherlands)
    if (idealButtonRef.current && selectedMethod === 'ideal') {
      idealButtonRef.current.innerHTML = '';
      if (window.paypal.FUNDING.IDEAL) {
        window.paypal.Buttons({
          fundingSource: window.paypal.FUNDING.IDEAL,
          style: {
            layout: 'vertical',
            shape: 'rect',
            height: 40,
          },
          createOrder,
          onApprove,
          onError,
        }).render(idealButtonRef.current);
      } else {
        idealButtonRef.current.innerHTML = '<p class="text-xs text-muted-foreground text-center py-4">iDEAL not available in your region</p>';
      }
    }
  }, [sdkReady, selectedMethod, amount, currency, item, toast, onPaymentComplete, paymentComplete]);

  if (paymentComplete && orderId) {
    return (
      <div className="border border-primary bg-card p-4 w-full max-w-sm">
        <div className="border-b border-primary pb-2 mb-4">
          <span className="text-xs text-primary uppercase tracking-wider">
            [ PAYMENT CONFIRMED ]
          </span>
        </div>

        <div className="text-center py-6">
          <div className="w-16 h-16 mx-auto mb-4 rounded-full bg-primary/20 flex items-center justify-center">
            <Check className="w-8 h-8 text-primary" />
          </div>
          <h3 className="text-lg font-bold text-foreground mb-2">
            Payment Successful!
          </h3>
          <p className="text-sm text-muted-foreground mb-4">
            {amount} {currency} paid
          </p>
        </div>

        <div className="border border-border bg-secondary p-3 mb-4">
          <p className="text-xs text-muted-foreground mb-1">Order ID:</p>
          <code className="text-xs text-primary break-all font-mono">
            {orderId}
          </code>
        </div>

        <p className="text-xs text-muted-foreground text-center">
          Your purchase is complete. Check your email for confirmation.
        </p>
      </div>
    );
  }

  return (
    <div className="border border-border bg-card p-4 w-full max-w-sm">
      <div className="border-b border-border pb-2 mb-4">
        <span className="text-xs text-muted-foreground uppercase tracking-wider">
          [ CARD / PAYPAL PAYMENT ]
        </span>
      </div>

      <div className="mb-4">
        <p className="text-sm text-foreground mb-1">{item}</p>
        <p className="text-xs text-muted-foreground">
          Pay securely with PayPal, card, or iDEAL
        </p>
      </div>

      <div className="grid grid-cols-3 gap-1 mb-4">
        <Button
          variant={selectedMethod === 'paypal' ? "default" : "secondary"}
          size="sm"
          onClick={() => setSelectedMethod('paypal')}
          className="text-xs px-2 py-1 h-auto"
        >
          PayPal
        </Button>
        <Button
          variant={selectedMethod === 'card' ? "default" : "secondary"}
          size="sm"
          onClick={() => setSelectedMethod('card')}
          className="text-xs px-2 py-1 h-auto flex items-center gap-1"
        >
          <CreditCard className="h-3 w-3" />
          Card
        </Button>
        <Button
          variant={selectedMethod === 'ideal' ? "default" : "secondary"}
          size="sm"
          onClick={() => setSelectedMethod('ideal')}
          className="text-xs px-2 py-1 h-auto"
        >
          iDEAL
        </Button>
      </div>

      <div className="border-t border-border pt-3 mb-4">
        <div className="flex justify-between text-sm">
          <span className="text-muted-foreground">Amount:</span>
          <span className="text-foreground font-medium">
            {amount} {currency}
          </span>
        </div>
      </div>

      {loading ? (
        <div className="flex items-center justify-center py-8">
          <Loader2 className="h-6 w-6 animate-spin text-muted-foreground" />
        </div>
      ) : !sdkReady ? (
        <div className="text-center py-4">
          <p className="text-xs text-destructive mb-2">
            PayPal SDK not loaded
          </p>
          <p className="text-xs text-muted-foreground">
            Replace YOUR_PAYPAL_CLIENT_ID with your actual PayPal Client ID
          </p>
        </div>
      ) : (
        <div className="space-y-3">
          <div 
            ref={paypalButtonRef} 
            className={selectedMethod === 'paypal' ? 'block' : 'hidden'}
          />
          <div 
            ref={cardButtonRef} 
            className={selectedMethod === 'card' ? 'block' : 'hidden'}
          />
          <div 
            ref={idealButtonRef} 
            className={selectedMethod === 'ideal' ? 'block' : 'hidden'}
          />
        </div>
      )}

      <p className="text-xs text-muted-foreground mt-4 leading-relaxed">
        {selectedMethod === 'paypal' && "Pay with your PayPal balance or linked cards."}
        {selectedMethod === 'card' && "Pay securely with Visa, Mastercard, or Amex."}
        {selectedMethod === 'ideal' && "Pay directly from your Dutch bank account."}
      </p>
    </div>
  );
};

export default PayPalPayment;