// Taken from https://medium.com/walletconnect/how-to-build-a-wallet-in-react-native-with-the-web3wallet-sdk-b6f57bf02f9a
import {
  EIP155_CHAINS,
  EIP155_SIGNING_METHODS,
  TEIP155Chain,
} from './EIP155Lib';
import { eip155Wallets } from './EIP155Wallet';
import {
  getSignParamsMessage,
  getSignTypedDataParamsData,
  getWalletAddressFromParams,
} from './Helpers';
import { formatJsonRpcError, formatJsonRpcResult } from '@json-rpc-tools/utils';
import { SignClientTypes } from '@walletconnect/types';
import { getSdkError } from '@walletconnect/utils';
import { providers } from 'ethers';
import { currentETHAddress } from './WalletConnectUtils';

export async function approveEIP155Request(
  requestEvent: SignClientTypes.EventArguments['session_request'],
) {
  const { params, id } = requestEvent;
  const { chainId, request } = params;
  const wallet =
    eip155Wallets[getWalletAddressFromParams([currentETHAddress], params)];

  switch (request.method) {
    case EIP155_SIGNING_METHODS.PERSONAL_SIGN:
    case EIP155_SIGNING_METHODS.ETH_SIGN:
      const message = getSignParamsMessage(request.params);
      const signedMessage = await wallet.signMessage(message);
      return formatJsonRpcResult(id, signedMessage);

    case EIP155_SIGNING_METHODS.ETH_SIGN_TYPED_DATA:
    case EIP155_SIGNING_METHODS.ETH_SIGN_TYPED_DATA_V3:
    case EIP155_SIGNING_METHODS.ETH_SIGN_TYPED_DATA_V4:
      const {
        domain,
        types,
        message: data,
      } = getSignTypedDataParamsData(request.params);
      // https://github.com/ethers-io/ethers.js/issues/687#issuecomment-714069471
      delete types.EIP712Domain;
      const signedData = await wallet._signTypedData(domain, types, data);
      return formatJsonRpcResult(id, signedData);

    case EIP155_SIGNING_METHODS.ETH_SEND_TRANSACTION:
      const provider = new providers.JsonRpcProvider(
        EIP155_CHAINS[chainId as TEIP155Chain].rpc,
      );
      const sendTransaction = request.params[0];
      const connectedWallet = wallet.connect(provider);
      const { hash } = await connectedWallet.sendTransaction(sendTransaction);
      return formatJsonRpcResult(id, hash);

    case EIP155_SIGNING_METHODS.ETH_SIGN_TRANSACTION:
      const signTransaction = request.params[0];
      const signature = await wallet.signTransaction(signTransaction);
      return formatJsonRpcResult(id, signature);

    default:
      throw new Error(getSdkError('INVALID_METHOD').message);
  }
}

export function rejectEIP155Request(
  request: SignClientTypes.EventArguments['session_request'],
) {
  const { id } = request;

  return formatJsonRpcError(id, getSdkError('USER_REJECTED_METHODS').message);
}