/*  Importing this library provides react native with a secure random source.
For more information, "visit https://docs.ethers.org/v5/cookbook/react-native/#cookbook-reactnative-security" */
import 'react-native-get-random-values';
import '@ethersproject/shims';

import { Wallet, utils } from 'ethers';
import { HDNode } from 'ethers/lib/utils';
import {
  setInternetCredentials,
  getInternetCredentials,
  resetInternetCredentials,
} from 'react-native-keychain';

import { AccountData, Secp256k1HdWallet } from '@cosmjs/amino';
import { stringToPath } from '@cosmjs/crypto';

const createWallet = async (): Promise<{
  ethWalletInfo: { pubKey: string; address: string } | undefined;
  cosmosWalletInfo: { pubKey: string; address: string } | undefined;
}> => {
  try {
    const mnemonic = utils.entropyToMnemonic(utils.randomBytes(32));
    await setInternetCredentials('mnemonicServer', 'mnemonic', mnemonic);

    const hdNode = HDNode.fromMnemonic(mnemonic);

    const ethNode = hdNode.derivePath("m/44'/60'/0'/0/0");
    const cosmosNode = hdNode.derivePath("m/44'/118'/0'/0/0");

    const ethAddress = ethNode.address;
    const cosmosAddress = (await getCosmosAccounts(mnemonic, 0)).data.address;

    await setInternetCredentials(
      'eth:keyServer:0',
      'eth:key:0',
      ethNode.privateKey,
    );
    await setInternetCredentials(
      'cosmos:keyServer:0',
      'cosmos:key:0',
      cosmosNode.privateKey,
    );

    const ethWalletInfo = { pubKey: ethNode.publicKey, address: ethAddress };
    const cosmosWalletInfo = {
      pubKey: cosmosNode.publicKey,
      address: cosmosAddress,
    };

    return { ethWalletInfo, cosmosWalletInfo };
  } catch (error) {
    console.error('Error creating HD wallet:', error);

    return { ethWalletInfo: undefined, cosmosWalletInfo: undefined };
  }
};

async function getCosmosAccounts(
  mnemonic: string,
  index: number,
): Promise<{ cosmosWallet: Secp256k1HdWallet; data: AccountData }> {
  const cosmosWallet = await Secp256k1HdWallet.fromMnemonic(mnemonic, {
    hdPaths: [stringToPath(`m/44'/118'/0'/0/${index}`)],
  });

  const accountsData = await cosmosWallet.getAccounts();
  const data = accountsData[index];

  return { cosmosWallet, data };
}

const signMessage = async (
  message: string,
  walletType: string,
  index: number,
): Promise<string | undefined> => {
  try {
    console.log(walletType);
    switch (walletType) {
      case 'eth':
        return await signEthMessage(message, index);

      case 'cosmos':
        return await signCosmosMessage(message, index);

      default:
        throw new Error('Invalid wallet type');
    }
  } catch (error) {
    console.error('Error signing message:', error);
  }
};

const signEthMessage = async (
  message: string,
  index: number,
): Promise<string | undefined> => {
  try {
    const keyCred = await getInternetCredentials(`eth:keyServer:${index}`);

    if (!keyCred) {
      throw new Error('Failed to retrieve internet credentials');
    }

    const wallet = new Wallet(keyCred.password);
    const signature = await wallet.signMessage(message);

    return signature;
  } catch (error) {
    console.error('Error signing Ethereum message:', error);
  }
};

const signCosmosMessage = async (
  message: string,
  index: number,
): Promise<string | undefined> => {
  try {
    const mnemonicStore = await getInternetCredentials('mnemonicServer');

    if (mnemonicStore) {
      const mnemonic = mnemonicStore.password;
      const cosmosAddress = (await getCosmosAccounts(mnemonic, index)).data
        .address;

      const cosmosSignature = await (
        await getCosmosAccounts(mnemonic, index)
      ).cosmosWallet.signAmino(cosmosAddress, {
        chain_id: '',
        account_number: '0',
        sequence: '0',
        fee: {
          gas: '0',
          amount: [],
        },
        msgs: [
          {
            type: 'sign/MsgSignData',
            value: {
              signer: cosmosAddress,
              data: btoa(message),
            },
          },
        ],
        memo: '',
      });

      return cosmosSignature.signature.signature;
    }
  } catch (error) {
    console.error('Error signing message:', error);
  }
};

// const createAccount

const resetWallet = async () => {
  // TODO: Add method to reset all the accounts
  await resetInternetCredentials('mnemonicServer');
  await resetInternetCredentials('eth:keyServer:0');
  await resetInternetCredentials('cosmos:keyServer:0');
};

export { createWallet, signMessage, resetWallet };