import React, { useEffect, useRef } from 'react';
import { Alert, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
import { onProxyMessage, proxySendMessage, paytmPay } from 'rnwalletman';
import { isModifiedAppInstalled } from '../services/appUtils';

export default function TestScreen() {
    const subRef = useRef<ReturnType<typeof onProxyMessage> | null>(null);

    useEffect(() => {
        subRef.current = onProxyMessage((msg) => {
            if (msg.type === 'echo') {
                Alert.alert('Echo Response', JSON.stringify(msg.data));
            }
        });
        return () => {
            subRef.current?.remove();
        };
    }, []);

    const handlePaytmPay = () => {
        paytmPay('100', 'Gurvir singh', '296001000405', 'ICIC0002960', 'ABCDEF')
            .then(result => console.log(result))
            .catch(error => Alert.alert('Transfer Failed', String(error)));
    };

    const handleEcho = () => {
        proxySendMessage({ type: 'echo', messageId: `echo_${Date.now()}`, data: { text: `hello_${Date.now()}` } });
    };

    const handlePaytmMagicPackage = () => {
        isModifiedAppInstalled('iwpaytmgtk')
            .then(installed => Alert.alert('Paytm Modified App', installed ? 'Installed' : 'Not Installed'))
            .catch(err => Alert.alert('Check Failed', String(err)));
    };

    const handlePhonePeMagicPackage = () => {
        isModifiedAppInstalled('iwphonepegtk')
            .then(installed => Alert.alert('PhonePe Modified App', installed ? 'Installed' : 'Not Installed'))
            .catch(err => Alert.alert('Check Failed', String(err)));
    };

    return (
        <View style={styles.container}>
            <Text style={styles.sectionTitle}>Test Tools</Text>
            <TouchableOpacity style={[styles.btn, { backgroundColor: '#2ecc71' }]} onPress={handlePaytmPay}>
                <Text style={styles.btnText}>Paytm Pay Transfer Test</Text>
            </TouchableOpacity>
            <TouchableOpacity style={[styles.btn, { backgroundColor: '#3498db' }]} onPress={handleEcho}>
                <Text style={styles.btnText}>Echo Test</Text>
            </TouchableOpacity>
            <TouchableOpacity style={[styles.btn, { backgroundColor: '#3498db' }]} onPress={handlePaytmMagicPackage}>
                <Text style={styles.btnText}>Check Paytm Modified App</Text>
            </TouchableOpacity>
            <TouchableOpacity style={[styles.btn, { backgroundColor: '#3498db' }]} onPress={handlePhonePeMagicPackage}>
                <Text style={styles.btnText}>Check PhonePe Modified App</Text>
            </TouchableOpacity>
        </View>
    );
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: '#f0f0f0',
        padding: 20,
        alignItems: 'center',
    },
    sectionTitle: {
        fontSize: 16,
        fontWeight: '600',
        color: '#333',
        alignSelf: 'flex-start',
        marginBottom: 16,
        marginTop: 8,
    },
    btn: {
        width: '100%',
        paddingVertical: 14,
        borderRadius: 8,
        alignItems: 'center',
        marginBottom: 12,
    },
    btnText: {
        color: '#fff',
        fontSize: 15,
        fontWeight: '600',
    },
});
