import React, { useCallback, useEffect, useState } from 'react';
import { Button, Snackbar, Text } from 'react-native-paper';
import Icon from 'react-native-vector-icons/MaterialCommunityIcons';
import { TxBody, AuthInfo } from 'cosmjs-types/cosmos/tx/v1beta1/tx';

import { SignClientTypes } from '@walletconnect/types';
import { useNavigation } from '@react-navigation/native';
import {
  NativeStackNavigationProp,
  createNativeStackNavigator,
} from '@react-navigation/native-stack';
import { getSdkError } from '@walletconnect/utils';
import { Web3WalletTypes } from '@walletconnect/web3wallet';
import { formatJsonRpcResult } from '@json-rpc-tools/utils';

import PairingModal from './components/PairingModal';
import { useWalletConnect } from './context/WalletConnectContext';
import { useAccounts } from './context/AccountsContext';
import InvalidPath from './screens/InvalidPath';
import SignMessage from './screens/SignMessage';
import HomeScreen from './screens/HomeScreen';
import SignRequest from './screens/SignRequest';
import AddSession from './screens/AddSession';
import WalletConnect from './screens/WalletConnect';
import { StackParamsList } from './types';
import { web3wallet } from './utils/wallet-connect/WalletConnectUtils';
import { EIP155_SIGNING_METHODS } from './utils/wallet-connect/EIP155Data';
import { getSignParamsMessage } from './utils/wallet-connect/helpers';
import ApproveTransaction from './screens/ApproveTransaction';
import AddNetwork from './screens/AddNetwork';
import EditNetwork from './screens/EditNetwork';
import { COSMOS, EIP155 } from './utils/constants';
import { useNetworks } from './context/NetworksContext';
import { NETWORK_METHODS } from './utils/wallet-connect/common-data';

const Stack = createNativeStackNavigator<StackParamsList>();

const App = (): React.JSX.Element => {
  const navigation =
    useNavigation<NativeStackNavigationProp<StackParamsList>>();

  const { setActiveSessions } = useWalletConnect();
  const { accounts, setCurrentIndex } = useAccounts();
  const { networksData, selectedNetwork, setSelectedNetwork } = useNetworks();
  const [modalVisible, setModalVisible] = useState(false);
  const [toastVisible, setToastVisible] = useState(false);
  const [currentProposal, setCurrentProposal] = useState<
    SignClientTypes.EventArguments['session_proposal'] | undefined
  >();

  const onSessionProposal = useCallback(
    async (proposal: SignClientTypes.EventArguments['session_proposal']) => {
      if (!accounts.length || !accounts.length) {
        const { id } = proposal;
        await web3wallet!.rejectSession({
          id,
          reason: getSdkError('UNSUPPORTED_ACCOUNTS'),
        });
        return;
      }
      setModalVisible(true);
      setCurrentProposal(proposal);
    },
    [accounts],
  );

  const onSessionRequest = useCallback(
    async (requestEvent: Web3WalletTypes.SessionRequest) => {
      const { topic, params, id } = requestEvent;
      const { request } = params;

      const requestSessionData =
        web3wallet!.engine.signClient.session.get(topic);
      switch (request.method) {
        case NETWORK_METHODS.GET_NETWORKS:
          const currentNetworkId = networksData.find(
            networkData => networkData.networkId === selectedNetwork!.networkId,
          )?.networkId;

          const networkNamesData = networksData.map(networkData => {
            return {
              id: networkData.networkId,
              name: networkData.networkName,
            };
          });

          const formattedResponse = formatJsonRpcResult(id, {
            currentNetworkId,
            networkNamesData,
          });

          await web3wallet!.respondSessionRequest({
            topic,
            response: formattedResponse,
          });
          break;

        case NETWORK_METHODS.CHANGE_NETWORK:
          const networkNameData = request.params[0];
          const network = networksData.find(
            networkData => networkData.networkId === networkNameData.id,
          );
          setCurrentIndex(0);
          setSelectedNetwork(network);

          const response = formatJsonRpcResult(id, {
            response: 'true',
          });

          await web3wallet!.respondSessionRequest({
            topic,
            response: response,
          });
          break;

        case EIP155_SIGNING_METHODS.ETH_SEND_TRANSACTION:
          navigation.navigate('ApproveTransaction', {
            transaction: request.params[0],
            requestEvent,
            requestSessionData,
          });
          break;

        case EIP155_SIGNING_METHODS.PERSONAL_SIGN:
          navigation.navigate('SignRequest', {
            namespace: EIP155,
            address: request.params[1],
            message: getSignParamsMessage(request.params),
            requestEvent,
            requestSessionData,
          });
          break;

        case 'cosmos_signDirect':
          const message = {
            txbody: TxBody.toJSON(
              TxBody.decode(
                Uint8Array.from(
                  Buffer.from(request.params.signDoc.bodyBytes, 'hex'),
                ),
              ),
            ),
            authInfo: AuthInfo.toJSON(
              AuthInfo.decode(
                Uint8Array.from(
                  Buffer.from(request.params.signDoc.authInfoBytes, 'hex'),
                ),
              ),
            ),
          };
          navigation.navigate('SignRequest', {
            namespace: COSMOS,
            address: request.params.signerAddress,
            message: JSON.stringify(message, undefined, 2),
            requestEvent,
            requestSessionData,
          });
          break;

        case 'cosmos_signAmino':
          navigation.navigate('SignRequest', {
            namespace: COSMOS,
            address: request.params.signerAddress,
            message: request.params.signDoc.memo,
            requestEvent,
            requestSessionData,
          });
          break;

        case 'cosmos_sendTokens':
          navigation.navigate('ApproveTransaction', {
            transaction: request.params[0],
            requestEvent,
            requestSessionData,
          });
          break;

        default:
          throw new Error('Invalid method');
      }
    },
    [
      navigation,
      networksData,
      setSelectedNetwork,
      setCurrentIndex,
      selectedNetwork,
    ],
  );

  const onSessionDelete = useCallback(() => {
    const sessions = web3wallet!.getActiveSessions();
    setActiveSessions(sessions);
  }, [setActiveSessions]);

  useEffect(() => {
    web3wallet?.on('session_proposal', onSessionProposal);
    web3wallet?.on('session_request', onSessionRequest);
    web3wallet?.on('session_delete', onSessionDelete);
    return () => {
      web3wallet?.off('session_proposal', onSessionProposal);
      web3wallet?.off('session_request', onSessionRequest);
      web3wallet?.off('session_delete', onSessionDelete);
    };
    //TODO: Investigate dependencies
  });

  return (
    <>
      <Stack.Navigator>
        <Stack.Screen
          name="Laconic"
          component={HomeScreen}
          options={{
            // eslint-disable-next-line react/no-unstable-nested-components
            headerTitle: () => <Text variant="titleLarge">Laconic Wallet</Text>,
            headerBackVisible: false,
          }}
        />
        <Stack.Screen
          name="SignMessage"
          component={SignMessage}
          options={{
            // eslint-disable-next-line react/no-unstable-nested-components
            headerTitle: () => <Text variant="titleLarge">Sign Message</Text>,
          }}
        />
        <Stack.Screen
          name="SignRequest"
          component={SignRequest}
          options={{
            // eslint-disable-next-line react/no-unstable-nested-components
            headerTitle: () => <Text variant="titleLarge">Sign Request</Text>,
          }}
        />
        <Stack.Screen
          name="InvalidPath"
          component={InvalidPath}
          options={{
            // eslint-disable-next-line react/no-unstable-nested-components
            headerTitle: () => <Text variant="titleLarge">Bad Request</Text>,
            headerBackVisible: false,
          }}
        />
        <Stack.Screen
          name="WalletConnect"
          component={WalletConnect}
          options={{
            // eslint-disable-next-line react/no-unstable-nested-components
            headerTitle: () => <Text variant="titleLarge">WalletConnect</Text>,
            // eslint-disable-next-line react/no-unstable-nested-components
            headerRight: () => (
              <Button
                onPress={() => {
                  navigation.navigate('AddSession');
                }}>
                {<Icon name={'qrcode-scan'} size={20} />}
              </Button>
            ),
          }}
        />

        <Stack.Screen
          name="AddSession"
          component={AddSession}
          options={{
            title: 'New session',
          }}
        />

        <Stack.Screen
          name="ApproveTransaction"
          component={ApproveTransaction}
          options={{
            title: 'Approve transaction',
          }}
        />
        <Stack.Screen
          name="AddNetwork"
          component={AddNetwork}
          options={{
            title: 'Add Network',
          }}
        />
        <Stack.Screen
          name="EditNetwork"
          component={EditNetwork}
          options={{
            title: 'Edit Network',
          }}
        />
      </Stack.Navigator>
      <PairingModal
        visible={modalVisible}
        setModalVisible={setModalVisible}
        currentProposal={currentProposal}
        setCurrentProposal={setCurrentProposal}
        setToastVisible={setToastVisible}
      />
      <Snackbar
        visible={toastVisible}
        onDismiss={() => setToastVisible(false)}
        duration={3000}>
        Session approved
      </Snackbar>
    </>
  );
};

export default App;