import React, { useEffect, useState } from 'react';
import { View, Text, ScrollView, Alert } from 'react-native';
import { RouteProp, useNavigation, useRoute } from '@react-navigation/native';
import { StackNavigationProp } from '@react-navigation/stack';
import { getStyles } from './checkoutPaymentScreen.styles';
import {
  Header,
  StepProgress,
  PaymentOption,
  PrimaryButton,
} from '@components';
import { useAppTheme } from '@theme';
import { AppStackParamList } from '../../../navigation/appStack';
import { RootState, useAppDispatch, useAppSelector } from '@store';
import { getAllPaymentMethodsThunk, placeOrderThunk } from './thunk';
import { v4 } from 'react-native-uuid/dist/v4';
import { useStripePayment } from './hooks/useStripePayment';
import { useRazorPayment } from './hooks/useRazorPayment';

type CheckoutPaymentNavProp = StackNavigationProp<
  AppStackParamList,
  'CheckoutPaymentScreen'
>;
type CheckoutPaymentRouteProp = RouteProp<
  AppStackParamList,
  'CheckoutPaymentScreen'
>;

const CHECKOUT_STEPS = [
  { key: 'address', label: 'Address' },
  { key: 'payment', label: 'Payment' },
  { key: 'confirm', label: 'Confirm' },
];

// const PAYMENT_METHODS = [
//   { id: 'upi', type: 'UPI' as const, label: 'UPI (Google Pay, PhonePe)' },
//   { id: 'card', type: 'Card' as const, label: 'Credit / Debit Card' },
//   { id: 'wallet', type: 'Wallet' as const, label: 'Wallet' },
//   { id: 'cod', type: 'COD' as const, label: 'Cash on Delivery' },
// ];

export const CheckoutPaymentScreen: React.FC = () => {
  const { colors } = useAppTheme();
  const styles = getStyles(colors);
  const route = useRoute<CheckoutPaymentRouteProp>();
  const navigation = useNavigation<CheckoutPaymentNavProp>();
  const dispatch = useAppDispatch();
  const [selectedMethod, setSelectedMethod] = useState('upi');
  const selectedAddressId = route.params?.selectedAddressId;
  // console.log(selectedAddressId);
  const uuid = v4();
  // console.log(uuid);
  const { paymentMethods, placeOrderLoading } = useAppSelector(
    (state: RootState) => state.paymentMethods,
  );

  const { processCardPayment, isPaymentProcessing } = useStripePayment();
  const { processRazorpayPayment, isPaymentProcessing: isRazorpayProcessing } =
    useRazorPayment();

  useEffect(() => {
    dispatch(getAllPaymentMethodsThunk());
  }, [dispatch]);

  // console.log('paymentMethods', paymentMethods);

  const selectedPaymentMethod = paymentMethods.find(
    item => item.id === selectedMethod,
  );

  const methodName = selectedPaymentMethod?.code;
  // console.log('methodName', methodName);

  // useEffect(() => {

  // },);

  const handlePlaceOrder = async () => {
    try {
      const response = await dispatch(
        placeOrderThunk({
          addressId: selectedAddressId || '',
          paymentMethodId: selectedMethod,
          paymentMethod: methodName || '',
          orderType: 'DELIVERY',
          idempotencyKey: `idemp-key-${uuid}`,
        }),
      ).unwrap();

      if (methodName === 'CARD') {
        // Delegate entire Stripe flow to the hook
        const success = await processCardPayment(response);
        if (success) {
          navigation.navigate('OrderConfirmedScreen', {
            orderId:
              response.orders[0]?.orderNumber ||
              'ORD-' + Math.floor(Math.random() * 900000 + 100000),
          });
        }
      } else if (methodName === 'UPI') {
        // Delegate entire Razorpay UPI flow to the hook
        const success = await processRazorpayPayment(response, 'upi');
        if (success) {
          navigation.navigate('OrderConfirmedScreen', {
            orderId:
              response.orders[0]?.orderNumber ||
              'ORD-' + Math.floor(Math.random() * 900000 + 100000),
          });
        }
      } else {
        // Non-card methods (COD, Wallet) – navigate directly
        navigation.navigate('OrderConfirmedScreen', {
          orderId:
            response.orders[0]?.orderNumber ||
            'ORD-' + Math.floor(Math.random() * 900000 + 100000),
        });
      }
    } catch (err: any) {
      Alert.alert('Error', err || 'Failed to place order');
    }
  };

  const isLoading =
    placeOrderLoading || isPaymentProcessing || isRazorpayProcessing;

  return (
    <View style={styles.container}>
      <Header title="Checkout" onBack={() => navigation.goBack()} />
      <StepProgress steps={CHECKOUT_STEPS} activeStep={1} />
      <ScrollView contentContainerStyle={styles.content}>
        <Text style={styles.sectionTitle}>Select Payment Method</Text>
        {paymentMethods?.map(method => (
          <PaymentOption
            key={method.id}
            label={method.code}
            icon={method.iconUrl}
            isSelected={selectedMethod === method.id}
            onSelect={() => setSelectedMethod(method.id)}
          />
        ))}
      </ScrollView>
      <View style={styles.footer}>
        <PrimaryButton
          title={isLoading ? 'Processing...' : 'Place Order'}
          onPress={handlePlaceOrder}
          disabled={isLoading}
        />
      </View>
    </View>
  );
};