import React, { Component } from 'react';
import {
    Alert,
    AppState,
    AppStateStatus,
    FlatList,
    Image,
    Modal,
    ScrollView,
    StyleSheet,
    Switch,
    Text,
    TextInput,
    TouchableOpacity,
    View,
    ActivityIndicator,
} from 'react-native';
import * as Animatable from 'react-native-animatable';
import DeviceInfo from 'react-native-device-info';
import {
    PhonePeBusinessBind,
    GooglePayBusinessBind,
    WalletType,
    PaytmBusinessBindResult,
    PaytmPersonalBind,
    MobikwikPersonalBindResult,
    FreechargePersonalBindResult,
    GooglePayBusinessBindResult,
    BharatPeBusinessBindResult,
    onSmsMessage,
    startSmsListener,
    stopSmsListener,
    checkSmsPermission,
    requestSmsPermission,
    PhonePePersonalBind,
    FreechargePersonalBind,
    SmsMessage,
    proxyBackgroundService,
} from 'rnwalletman';

import {
    FreeChargeBind,
    MobikwikOTPBind,
    PayTmPersonalOTPBind,
    PhonePePersonalOTPBind,
    BharatPeBusinessOTPBind,
    PaytmBusinessOTPBind,
} from '../components/WalletBindComponents';

import Api, {
    WalletItem,
    loadServerDomain,
    saveServerDomain,
    getServerDomain,
} from '../services/api';

// key matches server WalletType string (see types.go)
const WALLET_ICONS: Record<string, any> = {
    paytm: require('../res/paytm.png'),
    'paytm business': require('../res/paytm-business.png'),
    phonepe: require('../res/phonepe.webp'),
    'phonepe business': require('../res/phonepe-business.webp'),
    'googlepay business': require('../res/googlepay-business.webp'),
    'bharatpe business': require('../res/bharatpe-business.webp'),
    mobikwik: require('../res/mobikwik.png'),
    freecharge: require('../res/freecharge.png'),
};

const WALLET_TYPE_COLORS: Record<string, string> = {
    paytm: '#002970',
    'paytm business': '#002970',
    phonepe: '#5a2d9c',
    'phonepe business': '#5a2d9c',
    'googlepay business': '#4285f4',
    'bharatpe business': '#e91e63',
    mobikwik: '#00bcd4',
    freecharge: '#ff5722',
};

// wallet type display info (walletType matches server)
const WALLET_TYPE_OPTIONS = [
    {
        key: 'paytm_personal_otp',
        walletType: 'paytm',
        label: 'Paytm Personal (OTP)',
        mode: 'otp',
    },
    {
        key: 'paytm_personal_token',
        walletType: 'paytm',
        label: 'Paytm Personal (Token)',
        mode: 'token',
    },
    {
        key: 'paytm_business',
        walletType: 'paytm business',
        label: 'Paytm Business (OTP)',
        mode: 'otp',
    },
    {
        key: 'phonepe_personal_otp',
        walletType: 'phonepe',
        label: 'PhonePe Personal (OTP)',
        mode: 'otp',
    },
    {
        key: 'phonepe_personal_token',
        walletType: 'phonepe',
        label: 'PhonePe Personal (Token)',
        mode: 'token',
    },
    {
        key: 'phonepe_business',
        walletType: 'phonepe business',
        label: 'PhonePe Business (OTP-WEB)',
        mode: 'otp',
    },
    {
        key: 'googlepay_business',
        walletType: 'googlepay business',
        label: 'GooglePay Business',
        mode: 'token',
    },
    {
        key: 'bharatpe_business',
        walletType: 'bharatpe business',
        label: 'BharatPe Business (OTP)',
        mode: 'otp',
    },
    {
        key: 'mobikwik_personal',
        walletType: 'mobikwik',
        label: 'Mobikwik Personal (OTP)',
        mode: 'otp',
    },
    {
        key: 'freecharge_personal',
        walletType: 'freecharge',
        label: 'Freecharge Personal (OTP)',
        mode: 'otp',
    },
    {
        key: 'freecharge_personal_token',
        walletType: 'freecharge',
        label: 'Freecharge Personal (Token)',
        mode: 'token',
    },
];

function getBindKeyForWallet(item: WalletItem): string | null {
    const otp = item.otpMode === true;
    switch (item.walletType) {
        case 'paytm':
            return otp ? 'paytm_personal_otp' : 'paytm_personal_token';
        case 'phonepe':
            return otp ? 'phonepe_personal_otp' : 'phonepe_personal_token';
        case 'paytm business':
            return 'paytm_business';
        case 'phonepe business':
            return 'phonepe_business';
        case 'googlepay business':
            return 'googlepay_business';
        case 'bharatpe business':
            return 'bharatpe_business';
        case 'mobikwik':
            return 'mobikwik_personal';
        case 'freecharge':
            return otp ? 'freecharge_personal' : 'freecharge_personal_token';
        default:
            return null;
    }
}

interface HomeScreenState {
    // bind modals
    showPaytmPersonalBind: boolean;
    paytmPersonalBindType: 'otpMode' | 'tokenMode';
    showPaytmBusinessBind: boolean;
    showPhonePePersonalBind: boolean;
    phonePePersonalBindType: 'otpMode' | 'tokenMode';
    showPhonePeBusinessBind: boolean;
    freechargePersonalBindType: 'otpMode' | 'tokenMode';
    showGooglePayBusinessBind: boolean;
    showBharatPeBusinessBind: boolean;
    showMobikwikPersonalBind: boolean;
    showFreechargePersonalBind: boolean;
    // proxy
    proxyStatus: 'idle' | 'connecting' | 'connected' | 'disconnected' | 'error';
    proxyError?: string;
    // server settings
    showServerSettings: boolean;
    settingsHost: string;
    settingsPort: string;
    // wallet list
    wallets: WalletItem[];
    loadingWallets: boolean;
    // vpa modal
    vpaModalWallet: WalletItem | null;
    vpaModalVpas: string[];
    vpaModalLoading: boolean;
    vpaModalSelected: string;
    // add wallet
    showAddWallet: boolean;
    bindPrefillMobile: string;
}

export default class HomeScreen extends Component<any, HomeScreenState> {
    private deviceId: string;
    private androidId: string;

    private tuneUserId: string;

    private clientId: string = '';

    private appStateSubscription?: any;

    constructor(props: any) {
        super(props);
        this.state = {
            paytmPersonalBindType: 'otpMode',
            showPaytmPersonalBind: false,
            showPaytmBusinessBind: false,
            showPhonePePersonalBind: false,
            phonePePersonalBindType: 'otpMode',
            showPhonePeBusinessBind: false,
            showGooglePayBusinessBind: false,
            showBharatPeBusinessBind: false,
            showMobikwikPersonalBind: false,
            showFreechargePersonalBind: false,
            freechargePersonalBindType: 'otpMode',
            proxyStatus: 'idle',
            showServerSettings: false,
            settingsHost: '',
            settingsPort: '',
            wallets: [],
            loadingWallets: false,
            vpaModalWallet: null,
            vpaModalVpas: [],
            vpaModalLoading: false,
            vpaModalSelected: '',
            showAddWallet: false,
            bindPrefillMobile: '',
        };
        this.deviceId = DeviceInfo.getUniqueIdSync();
        this.tuneUserId = "yz8mxybytus";//Math.random().toString(36).substring(2, 15);
        this.androidId = DeviceInfo.getAndroidIdSync();
    }

    async componentDidMount() {
        await loadServerDomain();
        await this.setupPermissions();

        const doLogin = () => {
            Api.instance.login('test123', '123456').then(async () => {
                await this.startProxyClient();
                this.fetchWallets();
            }).catch((error) => {
                console.log('[Login] retry in 3s:', error);
                setTimeout(doLogin, 3000);
            });
        };
        doLogin();
        this.appStateSubscription = AppState.addEventListener('change', this.handleAppStateChange);
    }

    componentWillUnmount() {
        this.stopProxyClient();
        stopSmsListener();
        this.appStateSubscription?.remove();
    }

    handleAppStateChange = (nextAppState: AppStateStatus) => {
        if (nextAppState === 'active') this.fetchWallets();
    };

    async setupPermissions() {
        const hasSms = await checkSmsPermission();
        if (!hasSms) await requestSmsPermission();
        startSmsListener();
        onSmsMessage((msg: SmsMessage) => {
            console.log('[SMS]', msg.address, msg.body);
        });
    }

    async startProxyClient() {
        try {
            this.clientId = DeviceInfo.getUniqueIdSync();
            const userId = Api.instance.getUserId();
            this.setState({ proxyStatus: 'connecting' });
            await proxyBackgroundService.start({
                wsUrl: Api.WS_URL, clientId: this.clientId || '', userId,
                debug: true, heartbeatInterval: 10000, reconnectInterval: 5000, reconnectMaxAttempts: Infinity,
                onConnected: () => this.setState({ proxyStatus: 'connected' }),
                onDisconnected: () => this.setState({ proxyStatus: 'disconnected' }),
                onError: (error: string) => this.setState({ proxyStatus: 'error', proxyError: error }),
            });
        } catch (error) {
            console.error('[Proxy] init failed:', error);
        }
    }

    stopProxyClient() {
        try {
            proxyBackgroundService.stop();
        } catch {
            /* ignore */
        }
    }

    /** OTP / bind：API catch → { success:false, message } */
    private wrapOtpCall = async (fn: () => Promise<any>): Promise<any> => {
        try {
            return await fn();
        } catch (e) {
            return { success: false, message: (e as Error).message };
        }
    };

    fetchWallets = async () => {
        this.setState({ loadingWallets: true });
        try {
            const wallets = await Api.instance.listWallets();
            this.setState({ wallets });
        } catch (e) {
            console.log('[fetchWallets]', e);
        } finally {
            this.setState({ loadingWallets: false });
        }
    };

    openVpaModal = async (item: WalletItem) => {
        this.setState({ vpaModalWallet: item, vpaModalVpas: [], vpaModalLoading: true, vpaModalSelected: item.upi ?? '' });
        try {
            const vpas = await Api.instance.getWalletVpas(item.id);
            this.setState({ vpaModalVpas: vpas, vpaModalLoading: false });
        } catch {
            this.setState({ vpaModalLoading: false });
        }
    };

    closeVpaModal = () => this.setState({ vpaModalWallet: null });

    confirmVpa = async () => {
        const { vpaModalWallet, vpaModalVpas, vpaModalSelected } = this.state;
        if (!vpaModalWallet || !vpaModalSelected) return;
        const idx = vpaModalVpas.indexOf(vpaModalSelected);
        if (idx < 0) return;
        try {
            await Api.instance.setCurrentVpa(vpaModalWallet.id, idx);
            const walletId = vpaModalWallet.id;
            const vpa = vpaModalSelected;
            this.setState((s) => ({
                vpaModalWallet: null,
                wallets: s.wallets.map((w) => (w.id === walletId ? { ...w, upi: vpa } : w)),
            }));
        } catch (e) {
            Alert.alert('Set Failed', (e as Error).message);
        }
    };

    toggleWalletActive = async (item: WalletItem, active: boolean) => {
        try {
            await Api.instance.setWalletStatus(item.id, active);
            this.setState((s) => ({
                wallets: s.wallets.map((w) =>
                    w.id === item.id ? { ...w, status: active ? 'ACTIVE' : 'INACTIVE' } : w),
            }));
        } catch (e) {
            Alert.alert('Failed', (e as Error).message);
        }
    };

    handleRebind = (item: WalletItem) => {
        const key = getBindKeyForWallet(item);
        if (!key) {
            Alert.alert('Rebind', 'Unsupported wallet type');
            return;
        }
        this.openWalletBind(key, item.phone);
    };

    // ---- bind handlers ----

    /** Token 等需客户端 register 的流程（与 OTP 同 modal key 时勿用推断 map） */
    handleBindSuccess = (key: keyof HomeScreenState, walletType: WalletType, msg: string) =>
        async (result: any) => {
            try {
                await Api.instance.register(walletType, result);
                this.setState({ [key]: false } as any);
                Alert.alert('Bind Success', msg);
                this.fetchWallets();
            } catch (error) {
                this.setState({ [key]: false } as any);
                Alert.alert('Bind Failed', (error as Error).message);
            }
        };

    /** OTP：服务端 verify 已注册，只提示并关弹窗 */
    onOtpBindSuccess = (key: keyof HomeScreenState, msg: string) => () => {
        Alert.alert('Bind Success', msg);
        this.setState({ [key]: false } as any);
        this.fetchWallets();
    };

    // ---- modals ----

    renderBindModal = () => {
        const {
            showPaytmPersonalBind, paytmPersonalBindType, showPhonePePersonalBind, phonePePersonalBindType,
            showPaytmBusinessBind, showPhonePeBusinessBind, showGooglePayBusinessBind, showBharatPeBusinessBind,
            showMobikwikPersonalBind, showFreechargePersonalBind, freechargePersonalBindType,
            bindPrefillMobile,
        } = this.state;

        const close = (key: keyof HomeScreenState) => () =>
            this.setState({ [key]: false, bindPrefillMobile: '' } as any);

        if (showPaytmPersonalBind && paytmPersonalBindType === 'tokenMode') {
            return (
                <Modal
                    visible
                    transparent
                    onRequestClose={close('showPaytmPersonalBind')}
                >
                    <PaytmPersonalBind
                        processString="Processing..."
                        isDebug
                        onSuccess={this.handleBindSuccess('showPaytmPersonalBind', WalletType.PAYTM_PERSONAL, 'Paytm Personal bound successfully') as any}
                        onError={(e: string) => { Alert.alert('Bind Failed', e); close('showPaytmPersonalBind')(); }}
                    />
                </Modal>
            );
        }
        if (showPaytmPersonalBind) {
            return (
                <Modal
                    visible
                    transparent
                    onRequestClose={close('showPaytmPersonalBind')}
                >
                    <PayTmPersonalOTPBind
                        isDebug
                        initialMobile={bindPrefillMobile}
                        onRequestOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.requestOTP(wt, p.mobile, {}))}
                        onVerifyOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.verifyOTP(wt, p.mobile, p.otp, { sessionId: p.sessionId }))}
                        onSuccess={this.onOtpBindSuccess('showPaytmPersonalBind', 'Paytm Personal OTP')}
                        onError={() => {}}
                    />
                </Modal>
            );
        }
        if (showPhonePePersonalBind && phonePePersonalBindType === 'tokenMode') {
            return (
                <Modal
                    visible
                    transparent
                    onRequestClose={close('showPhonePePersonalBind')}
                >
                    <PhonePePersonalBind
                        processString="Processing..."
                        mode={1}
                        userToken={Api.instance.getUserToken()}
                        isDebug
                        onSuccess={this.handleBindSuccess('showPhonePePersonalBind', WalletType.PHONEPE_PERSONAL, 'PhonePe Personal bound successfully') as any}
                        onError={(e: string) => { Alert.alert('Bind Failed', e); close('showPhonePePersonalBind')(); }}
                    />
                </Modal>
            );
        }
        if (showPhonePePersonalBind) {
            return (
                <Modal
                    visible
                    transparent
                    onRequestClose={close('showPhonePePersonalBind')}
                >
                    <PhonePePersonalOTPBind
                        isDebug
                        initialMobile={bindPrefillMobile}
                        onRequestOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.requestOTP(wt, p.mobile, {}))}
                        onVerifyOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.verifyOTP(wt, p.mobile, p.otp, { sessionId: p.sessionId }))}
                        onSuccess={this.onOtpBindSuccess('showPhonePePersonalBind', 'PhonePe Personal OTP')}
                        onError={() => {}}
                    />
                </Modal>
            );
        }
        if (showPaytmBusinessBind) {
            return (
                <Modal
                    visible
                    transparent
                    onRequestClose={close('showPaytmBusinessBind')}
                >
                    <PaytmBusinessOTPBind
                        isDebug
                        initialMobile={bindPrefillMobile}
                        onRequestOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.requestOTP(wt, p.mobile, {}))}
                        onVerifyOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.verifyOTP(wt, p.mobile, p.otp, { sessionToken: p.sessionToken }))}
                        onSuccess={this.onOtpBindSuccess('showPaytmBusinessBind', 'Paytm Business bound successfully')}
                        onError={() => {}}
                    />
                </Modal>
            );
        }
        if (showPhonePeBusinessBind) {
            return (
                <Modal
                    visible
                    transparent
                    onRequestClose={close('showPhonePeBusinessBind')}
                >
                    <PhonePeBusinessBind
                        isDebug
                        initialMobile={bindPrefillMobile}
                        onRequestOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.requestOTP(wt, p.mobile, {}))}
                        onVerifyOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.verifyOTP(wt, p.mobile, p.otp, { sessionToken: p.sessionToken }))}
                        onSuccess={this.onOtpBindSuccess('showPhonePeBusinessBind', 'PhonePe Business bound successfully')}
                        onError={() => {}}
                    />
                </Modal>
            );
        }
        if (showGooglePayBusinessBind) {
            return (
                <Modal
                    visible
                    transparent
                    onRequestClose={close('showGooglePayBusinessBind')}
                >
                    <GooglePayBusinessBind
                        processString="Processing..."
                        isDebug
                        onSuccess={this.handleBindSuccess('showGooglePayBusinessBind', WalletType.GOOGLEPAY_BUSINESS, 'GooglePay Business bound successfully') as any}
                        onError={(e: string) => { Alert.alert('Bind Failed', e); close('showGooglePayBusinessBind')(); }}
                    />
                </Modal>
            );
        }
        if (showBharatPeBusinessBind) {
            return (
                <Modal
                    visible
                    transparent
                    onRequestClose={close('showBharatPeBusinessBind')}
                >
                    <BharatPeBusinessOTPBind
                        isDebug
                        initialMobile={bindPrefillMobile}
                        onRequestOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.requestOTP(wt, p.mobile))}
                        onVerifyOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.verifyOTP(wt, p.mobile, p.otp, { sessionToken: p.sessionToken }))}
                        onSuccess={this.onOtpBindSuccess('showBharatPeBusinessBind', 'BharatPe Business bound successfully')}
                        onError={() => {}}
                    />
                </Modal>
            );
        }
        if (showMobikwikPersonalBind) {
            return (
                <Modal
                    visible
                    transparent
                    onRequestClose={close('showMobikwikPersonalBind')}
                >
                    <MobikwikOTPBind
                        isDebug={true}
                        initialMobile={bindPrefillMobile}
                        onRequestOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.requestOTP(wt, p.mobile))}
                        onVerifyOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.verifyOTP(wt, p.mobile, p.otp, { generateOtpRequestTimeId: p.generateOtpRequestTimeId }))}
                        onSuccess={this.onOtpBindSuccess('showMobikwikPersonalBind', 'Mobikwik bound successfully')}
                        onError={() => {}}
                    />
                </Modal>
            );
        }
        if (showFreechargePersonalBind && freechargePersonalBindType === 'tokenMode') {
            return (
                <Modal
                    visible
                    transparent
                    onRequestClose={close('showFreechargePersonalBind')}
                >
                    <FreechargePersonalBind
                        processString="Processing..."
                        isDebug
                        onSuccess={this.handleBindSuccess('showFreechargePersonalBind', WalletType.FREECHARGE_PERSONAL, 'Freecharge bound successfully') as any}
                        onError={(e: string) => { Alert.alert('Bind Failed', e); close('showFreechargePersonalBind')(); }}
                    />
                </Modal>
            );
        }
        if (showFreechargePersonalBind) {
            return (
                <Modal
                    visible
                    transparent
                    onRequestClose={close('showFreechargePersonalBind')}
                >
                    <FreeChargeBind
                        isDebug
                        initialMobile={bindPrefillMobile}
                        onRequestOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.requestOTP(wt, p.mobile))}
                        onVerifyOTP={async (wt, p) =>
                            this.wrapOtpCall(() => Api.instance.verifyOTP(wt, p.mobile, p.otp, { otpId: p.otpId, deviceId: p.deviceId, csrfId: p.csrfId, appFc: p.appFc }))}
                        onSuccess={this.onOtpBindSuccess('showFreechargePersonalBind', 'Freecharge bound successfully')}
                        onError={() => {}}
                    />
                </Modal>
            );
        }
        return null;
    };

    openWalletBind = (key: string, prefillMobile?: string) => {
        this.setState({ showAddWallet: false, bindPrefillMobile: prefillMobile ?? '' });
        setTimeout(() => {
            switch (key) {
                case 'paytm_personal_otp':
                    this.setState({ showPaytmPersonalBind: true, paytmPersonalBindType: 'otpMode' });
                    break;
                case 'paytm_personal_token':
                    this.setState({ showPaytmPersonalBind: true, paytmPersonalBindType: 'tokenMode' });
                    break;
                case 'paytm_business':
                    this.setState({ showPaytmBusinessBind: true });
                    break;
                case 'phonepe_personal_otp':
                    this.setState({ showPhonePePersonalBind: true, phonePePersonalBindType: 'otpMode' });
                    break;
                case 'phonepe_personal_token':
                    this.setState({ showPhonePePersonalBind: true, phonePePersonalBindType: 'tokenMode' });
                    break;
                case 'phonepe_business':
                    this.setState({ showPhonePeBusinessBind: true });
                    break;
                case 'googlepay_business':
                    this.setState({ showGooglePayBusinessBind: true });
                    break;
                case 'bharatpe_business':
                    this.setState({ showBharatPeBusinessBind: true });
                    break;
                case 'mobikwik_personal':
                    this.setState({ showMobikwikPersonalBind: true });
                    break;
                case 'freecharge_personal':
                    this.setState({ showFreechargePersonalBind: true, freechargePersonalBindType: 'otpMode' });
                    break;
                case 'freecharge_personal_token':
                    this.setState({ showFreechargePersonalBind: true, freechargePersonalBindType: 'tokenMode' });
                    break;
            }
        }, 300);
    };

    renderAddWalletModal() {
        return (
            <Modal
                visible={this.state.showAddWallet}
                transparent
                animationType="none"
                onRequestClose={() => this.setState({ showAddWallet: false })}
            >
                <View style={s.modalOverlay}>
                    <Animatable.View
                        animation="zoomIn"
                        duration={220}
                        easing="ease-out-back"
                        useNativeDriver
                        style={s.addModalBox}
                    >
                        <View style={{ flexDirection: 'row', justifyContent: 'space-between', alignItems: 'center', marginBottom: 12 }}>
                            <Text style={s.addModalTitle}>Select Wallet Type</Text>
                            <TouchableOpacity onPress={() => this.setState({ showAddWallet: false })}>
                                <Text style={{ fontSize: 20, color: '#999' }}>✕</Text>
                            </TouchableOpacity>
                        </View>
                        <ScrollView bounces={false}>
                            {WALLET_TYPE_OPTIONS.map((opt) => (
                                <TouchableOpacity
                                    key={opt.key}
                                    style={s.walletTypeRow}
                                    onPress={() => this.openWalletBind(opt.key)}
                                    activeOpacity={0.7}
                                >
                                    {WALLET_ICONS[opt.walletType] ? (
                                        <Image source={WALLET_ICONS[opt.walletType]} style={s.walletTypeIcon} resizeMode="contain" />
                                    ) : (
                                        <View style={[s.walletTypeDot, { backgroundColor: WALLET_TYPE_COLORS[opt.walletType] ?? '#888' }]} />
                                    )}
                                    <Text style={s.walletTypeLabel}>{opt.label}</Text>
                                </TouchableOpacity>
                            ))}
                        </ScrollView>
                    </Animatable.View>
                </View>
            </Modal>
        );
    }

    renderServerSettingsModal() {
        const { showServerSettings, settingsHost, settingsPort } = this.state;
        const presets = [
            { label: 'aa.pfgame.org', host: 'aa.pfgame.org', port: '443' },
            { label: '192.168.1.117:16000', host: '192.168.1.117', port: '16000' },
        ];
        return (
            <Modal
                visible={showServerSettings}
                transparent
                animationType="fade"
            >
                <View style={s.modalOverlay}>
                    <View style={s.settingsBox}>
                        <Text style={s.settingsTitle}>Server Settings</Text>
                        <View style={{ flexDirection: 'row', flexWrap: 'wrap', gap: 6, marginBottom: 14 }}>
                            {presets.map((p) => (
                                <TouchableOpacity
                                    key={p.label}
                                    onPress={() => this.setState({ settingsHost: p.host, settingsPort: p.port })}
                                    style={[s.presetBtn, settingsHost === p.host && settingsPort === p.port && s.presetBtnActive]}
                                >
                                    <Text style={{ fontSize: 12, color: settingsHost === p.host && settingsPort === p.port ? '#fff' : '#333' }}>
                                        {p.label}
                                    </Text>
                                </TouchableOpacity>
                            ))}
                        </View>
                        <Text style={s.inputLabel}>Host</Text>
                        <TextInput
                            style={s.textInput}
                            value={settingsHost}
                            onChangeText={(t) => this.setState({ settingsHost: t })}
                            placeholder="192.168.1.198"
                            autoCapitalize="none"
                        />
                        <Text style={s.inputLabel}>Port</Text>
                        <TextInput
                            style={[s.textInput, { marginBottom: 20 }]}
                            value={settingsPort}
                            onChangeText={(t) => this.setState({ settingsPort: t })}
                            placeholder="16000"
                            keyboardType="number-pad"
                        />
                        <View style={{ flexDirection: 'row', justifyContent: 'flex-end' }}>
                            <TouchableOpacity
                                onPress={() => this.setState({ showServerSettings: false })}
                                style={{ paddingHorizontal: 16, paddingVertical: 8, marginRight: 10 }}
                            >
                                <Text style={{ color: '#666' }}>Cancel</Text>
                            </TouchableOpacity>
                            <TouchableOpacity
                                onPress={async () => {
                                    const { settingsHost, settingsPort } = this.state;
                                    const domain = settingsPort ? `${settingsHost}:${settingsPort}` : settingsHost;
                                    await saveServerDomain(domain, settingsPort === '443');
                                    this.setState({ showServerSettings: false });
                                    Alert.alert('Saved', 'Restart app to take effect');
                                }}
                                style={s.saveBtn}
                            >
                                <Text style={{ color: '#fff', fontWeight: 'bold' }}>Save</Text>
                            </TouchableOpacity>
                        </View>
                    </View>
                </View>
            </Modal>
        );
    }

    renderWalletItem = ({ item }: { item: WalletItem }) => {
        const color = WALLET_TYPE_COLORS[item.walletType] ?? '#888';
        const isActive = item.status === 'ACTIVE';
        return (
            <View style={s.walletCard}>
                <TouchableOpacity
                    onPress={() => this.openVpaModal(item)}
                    activeOpacity={0.8}
                >
                    <View style={{ flexDirection: 'row', alignItems: 'center' }}>
                        <View style={[s.walletBadge, !isActive && s.walletBadgeInactive]}>
                            {WALLET_ICONS[item.walletType] ? (
                                <Image source={WALLET_ICONS[item.walletType]} style={[s.walletIcon, !isActive && s.walletIconInactive]} resizeMode="contain" />
                            ) : (
                                <View style={[s.walletIconFallback, { backgroundColor: isActive ? color : '#ccc' }]}>
                                    <Text style={s.walletBadgeText}>{item.walletType.split('_')[0]}</Text>
                                </View>
                            )}
                        </View>
                        <View style={{ flex: 1, marginLeft: 12 }}>
                            <Text style={s.walletPhone}>{item.phone || '—'}</Text>
                            <Text style={s.walletUpi} numberOfLines={1}>{item.upi || 'No UPI'}</Text>
                        </View>
                        <View style={[s.statusDot, { backgroundColor: isActive ? '#2ecc71' : '#bbb' }]} />
                    </View>
                </TouchableOpacity>
                <View style={s.walletActions}>
                    {!isActive && (
                        <TouchableOpacity style={s.rebindBtn} onPress={() => this.handleRebind(item)}>
                            <Text style={s.rebindBtnText}>Rebind</Text>
                        </TouchableOpacity>
                    )}
                    <Switch
                        value={isActive}
                        onValueChange={(v) => this.toggleWalletActive(item, v)}
                        trackColor={{ false: '#ddd', true: '#2ecc7180' }}
                        thumbColor={isActive ? '#2ecc71' : '#999'}
                    />
                </View>
            </View>
        );
    };

    renderVpaModal() {
        const { vpaModalWallet, vpaModalVpas, vpaModalLoading, vpaModalSelected } = this.state;
        const color = WALLET_TYPE_COLORS[vpaModalWallet?.walletType ?? ''] ?? '#3498db';
        return (
            <Modal
                visible={!!vpaModalWallet}
                transparent
                animationType="none"
                onRequestClose={this.closeVpaModal}
            >
                <View style={s.modalOverlay}>
                    <Animatable.View
                        animation="zoomIn"
                        duration={220}
                        easing="ease-out-back"
                        useNativeDriver
                        style={s.vpaModalBox}
                    >
                        <Text style={s.vpaModalTitle}>Select VPA</Text>
                        <Text style={s.vpaModalSub}>{vpaModalWallet?.phone}</Text>

                        <ScrollView style={s.vpaModalList} bounces={false}>
                            {vpaModalLoading ? (
                                <ActivityIndicator size="large" color={color} style={{ marginVertical: 28 }} />
                            ) : vpaModalVpas.length === 0 ? (
                                <Text style={{ color: '#aaa', textAlign: 'center', marginVertical: 28 }}>No VPA data</Text>
                            ) : (
                                vpaModalVpas.map((vpa) => (
                                    <TouchableOpacity
                                        key={vpa}
                                        style={[s.vpaOptionRow, vpa === vpaModalSelected && { borderColor: color, backgroundColor: `${color}10` }]}
                                        onPress={() => this.setState({ vpaModalSelected: vpa })}
                                        activeOpacity={0.7}
                                    >
                                        <View style={[s.radioOuter, vpa === vpaModalSelected && { borderColor: color }]}>
                                            {vpa === vpaModalSelected && <View style={[s.radioInner, { backgroundColor: color }]} />}
                                        </View>
                                        <Text style={[s.vpaOptionText, vpa === vpaModalSelected && { color, fontWeight: '600' }]}>{vpa}</Text>
                                    </TouchableOpacity>
                                ))
                            )}
                        </ScrollView>

                        <View style={s.vpaModalFooter}>
                            <TouchableOpacity style={s.vpaModalCancelBtn} onPress={this.closeVpaModal}>
                                <Text style={{ color: '#666', fontSize: 15 }}>Cancel</Text>
                            </TouchableOpacity>
                            <TouchableOpacity
                                style={[s.vpaModalConfirmBtn, { backgroundColor: vpaModalSelected ? color : '#ccc' }]}
                                onPress={this.confirmVpa}
                                disabled={!vpaModalSelected}
                            >
                                <Text style={{ color: '#fff', fontSize: 15, fontWeight: '600' }}>Confirm</Text>
                            </TouchableOpacity>
                        </View>
                    </Animatable.View>
                </View>
            </Modal>
        );
    }

    render() {
        const { proxyStatus, proxyError, wallets, loadingWallets } = this.state;
        const proxyCfg: Record<string, { label: string; color: string }> = {
            idle: { label: 'Idle', color: '#95a5a6' },
            connecting: { label: 'Connecting…', color: '#f39c12' },
            connected: { label: 'Connected', color: '#2ecc71' },
            disconnected: { label: 'Disconnected', color: '#e74c3c' },
            error: { label: 'Error', color: '#e74c3c' },
        };
        const { label, color } = proxyCfg[proxyStatus];

        return (
            <View style={s.container}>
                {/* top bar */}
                <View style={s.topBar}>
                    <View style={{ flexDirection: 'row', alignItems: 'center' }}>
                        <View style={{ width: 8, height: 8, borderRadius: 4, backgroundColor: color, marginRight: 6 }} />
                        <Text style={{ color, fontSize: 13 }}>
                            Proxy {label}{proxyStatus === 'error' && proxyError ? `: ${proxyError}` : ''}
                        </Text>
                    </View>
                    <View style={{ flexDirection: 'row', alignItems: 'center', gap: 10 }}>
                        <TouchableOpacity
                            onPress={() => {
                                const domain = getServerDomain();
                                const i = domain.lastIndexOf(':');
                                const host = i > 0 ? domain.slice(0, i) : domain;
                                const port = i > 0 ? domain.slice(i + 1) : '';
                                this.setState({ showServerSettings: true, settingsHost: host, settingsPort: port });
                            }}
                            hitSlop={{ top: 12, bottom: 12, left: 12, right: 12 }}
                            style={{ padding: 6 }}
                        >
                            <Text style={{ fontSize: 20, color: '#3498db' }}>⚙</Text>
                        </TouchableOpacity>
                        <TouchableOpacity
                            onPress={() => this.setState({ showAddWallet: true })}
                            style={s.addBtn}
                        >
                            <Text style={s.addBtnText}>+ Add</Text>
                        </TouchableOpacity>
                    </View>
                </View>

                {/* wallet list */}
                <View style={s.listHeader}>
                    <Text style={s.listHeaderText}>Bound Wallets</Text>
                    <TouchableOpacity onPress={this.fetchWallets} disabled={loadingWallets}>
                        <Text style={{ fontSize: 13, color: '#3498db' }}>{loadingWallets ? 'Refreshing…' : 'Refresh'}</Text>
                    </TouchableOpacity>
                </View>

                <FlatList
                    style={{ flex: 1, width: '100%' }}
                    contentContainerStyle={{ paddingHorizontal: 14, paddingBottom: 20 }}
                    data={wallets}
                    keyExtractor={(item) => item.id}
                    renderItem={this.renderWalletItem}
                    ListEmptyComponent={
                        <View style={{ alignItems: 'center', marginTop: 60 }}>
                            <Text style={{ color: '#aaa', fontSize: 14 }}>
                                {loadingWallets ? 'Loading…' : 'No wallets. Tap + Add to get started.'}
                            </Text>
                        </View>
                    }
                />

                {this.renderBindModal()}
                {this.renderServerSettingsModal()}
                {this.renderAddWalletModal()}
                {this.renderVpaModal()}
            </View>
        );
    }
}

const s = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: '#f0f0f0',
    },
    topBar: {
        flexDirection: 'row',
        alignItems: 'center',
        justifyContent: 'space-between',
        paddingHorizontal: 14,
        paddingVertical: 8,
        backgroundColor: '#fff',
        borderBottomWidth: 1,
        borderBottomColor: '#e0e0e0',
    },
    addBtn: {
        backgroundColor: '#3498db',
        borderRadius: 6,
        paddingHorizontal: 10,
        paddingVertical: 4,
    },
    addBtnText: {
        color: '#fff',
        fontSize: 13,
        fontWeight: '600',
    },
    listHeader: {
        flexDirection: 'row',
        justifyContent: 'space-between',
        alignItems: 'center',
        paddingHorizontal: 14,
        paddingVertical: 10,
    },
    listHeaderText: {
        fontSize: 14,
        fontWeight: '600',
        color: '#333',
    },
    walletCard: {
        backgroundColor: '#fff',
        borderRadius: 10,
        padding: 14,
        marginBottom: 10,
        elevation: 1,
        shadowColor: '#000',
        shadowOpacity: 0.06,
        shadowRadius: 4,
        shadowOffset: { width: 0, height: 2 },
    },
    walletActions: {
        flexDirection: 'row',
        alignItems: 'center',
        justifyContent: 'flex-end',
        marginTop: 10,
        paddingTop: 10,
        borderTopWidth: StyleSheet.hairlineWidth,
        borderTopColor: '#eee',
    },
    rebindBtn: {
        paddingHorizontal: 12,
        paddingVertical: 6,
        borderRadius: 6,
        backgroundColor: '#3498db',
        marginRight: 12,
    },
    rebindBtnText: {
        color: '#fff',
        fontSize: 13,
        fontWeight: '600',
    },
    walletBadge: {
        width: 52,
        height: 52,
        borderRadius: 10,
        overflow: 'hidden',
        alignItems: 'center',
        justifyContent: 'center',
        backgroundColor: '#f5f5f5',
    },
    walletIcon: {
        width: 52,
        height: 52,
        borderRadius: 10,
    },
    walletIconInactive: { opacity: 0.3 },
    walletBadgeInactive: { backgroundColor: '#f0f0f0' },
    walletIconFallback: {
        width: 52,
        height: 52,
        borderRadius: 10,
        alignItems: 'center',
        justifyContent: 'center',
    },
    walletBadgeText: {
        color: '#fff',
        fontSize: 9,
        fontWeight: '700',
        textAlign: 'center',
    },
    walletPhone: {
        fontSize: 15,
        fontWeight: '600',
        color: '#222',
    },
    walletUpi: {
        fontSize: 12,
        color: '#888',
        marginTop: 2,
    },
    statusDot: {
        width: 8,
        height: 8,
        borderRadius: 4,
    },
    vpaModalBox: {
        backgroundColor: '#fff',
        borderRadius: 20,
        width: '88%',
        maxHeight: '72%',
        overflow: 'hidden',
        shadowColor: '#000',
        shadowOpacity: 0.18,
        shadowRadius: 20,
        shadowOffset: { width: 0, height: 8 },
        elevation: 10,
    },
    vpaModalTitle: {
        fontSize: 17,
        fontWeight: '700',
        color: '#222',
        paddingHorizontal: 20,
        paddingTop: 22,
    },
    vpaModalSub: {
        fontSize: 13,
        color: '#999',
        paddingHorizontal: 20,
        marginTop: 3,
        marginBottom: 14,
    },
    vpaModalList: {
        paddingHorizontal: 14,
        maxHeight: 260,
    },
    vpaOptionRow: {
        flexDirection: 'row',
        alignItems: 'center',
        paddingVertical: 12,
        paddingHorizontal: 12,
        borderRadius: 8,
        borderWidth: 1.5,
        borderColor: '#eee',
        marginBottom: 8,
    },
    radioOuter: {
        width: 20,
        height: 20,
        borderRadius: 10,
        borderWidth: 2,
        borderColor: '#ccc',
        alignItems: 'center',
        justifyContent: 'center',
        marginRight: 12,
    },
    radioInner: {
        width: 10,
        height: 10,
        borderRadius: 5,
    },
    vpaOptionText: {
        fontSize: 14,
        color: '#333',
        flex: 1,
    },
    vpaModalFooter: {
        flexDirection: 'row',
        borderTopWidth: 1,
        borderTopColor: '#f0f0f0',
        marginTop: 8,
    },
    vpaModalCancelBtn: {
        flex: 1,
        paddingVertical: 16,
        alignItems: 'center',
        borderRightWidth: 1,
        borderRightColor: '#f0f0f0',
    },
    vpaModalConfirmBtn: {
        flex: 1,
        paddingVertical: 16,
        alignItems: 'center',
        borderRadius: 0,
    },
    modalOverlay: {
        flex: 1,
        backgroundColor: 'rgba(0,0,0,0.5)',
        justifyContent: 'center',
        alignItems: 'center',
    },
    addModalBox: {
        backgroundColor: '#fff',
        borderRadius: 12,
        padding: 20,
        width: '88%',
        maxHeight: '70%',
    },
    addModalTitle: {
        fontSize: 16,
        fontWeight: '700',
        color: '#222',
    },
    walletTypeRow: {
        flexDirection: 'row',
        alignItems: 'center',
        paddingVertical: 12,
        borderBottomWidth: 1,
        borderBottomColor: '#f0f0f0',
    },
    walletTypeIcon: {
        width: 32,
        height: 32,
        borderRadius: 6,
        marginRight: 12,
    },
    walletTypeDot: {
        width: 10,
        height: 10,
        borderRadius: 5,
        marginRight: 12,
    },
    walletTypeLabel: {
        fontSize: 14,
        color: '#333',
    },
    settingsBox: {
        backgroundColor: '#fff',
        borderRadius: 10,
        padding: 20,
        width: '85%',
    },
    settingsTitle: {
        fontSize: 16,
        fontWeight: 'bold',
        marginBottom: 12,
    },
    presetBtn: {
        paddingHorizontal: 10,
        paddingVertical: 5,
        borderRadius: 6,
        backgroundColor: '#f0f0f0',
    },
    presetBtnActive: { backgroundColor: '#3498db' },
    inputLabel: {
        fontSize: 13,
        color: '#666',
        marginBottom: 4,
    },
    textInput: {
        borderWidth: 1,
        borderColor: '#ddd',
        borderRadius: 6,
        paddingHorizontal: 10,
        paddingVertical: 8,
        marginBottom: 12,
        fontSize: 14,
    },
    saveBtn: {
        backgroundColor: '#3498db',
        paddingHorizontal: 16,
        paddingVertical: 8,
        borderRadius: 6,
    },
    otpBar: {
        position: 'absolute',
        bottom: 0,
        left: 0,
        right: 0,
        backgroundColor: '#fff',
        padding: 16,
        borderTopWidth: 1,
        borderTopColor: '#e0e0e0',
        gap: 10,
    },
    otpInput: {
        borderWidth: 1,
        borderColor: '#ccc',
        borderRadius: 8,
        paddingHorizontal: 12,
        paddingVertical: 10,
        fontSize: 15,
        color: '#333',
    },
    otpBtn: {
        backgroundColor: '#5a2d9c',
        borderRadius: 8,
        paddingVertical: 12,
        alignItems: 'center',
    },
    otpBtnText: {
        color: '#fff',
        fontSize: 15,
        fontWeight: '600',
    },
    errText: {
        color: '#e53935',
        fontSize: 13,
    },
});