text: const CONTRACT_NAME = process.env.CONTRACT_NAME || 'challenge4.aiko.testnet';
  
  function getConfig(env) {
    switch(env) {
      case 'mainnet':
        return {
          networkId: 'mainnet',
          nodeUrl: 'https://rpc.mainnet.near.org',
          contractName: CONTRACT_NAME,
          walletUrl: 'https://wallet.near.org',
          helperUrl: 'https://helper.mainnet.near.org'
        };
      // This is an example app so production is set to testnet.
      // You can move production to mainnet if that is applicable.
      case 'production':
      case 'development':
      case 'testnet':
        return {
          networkId: 'testnet',
          nodeUrl: 'https://rpc.testnet.near.org',
          contractName: CONTRACT_NAME,
          walletUrl: 'https://wallet.testnet.near.org',
          helperUrl: 'https://helper.testnet.near.org'
        };
      case 'betanet':
        return {
          networkId: 'betanet',
          nodeUrl: 'https://rpc.betanet.near.org',
          contractName: CONTRACT_NAME,
          walletUrl: 'https://wallet.betanet.near.org',
          helperUrl: 'https://helper.betanet.near.org'
        };
      case 'local':
        return {
          networkId: 'local',
          nodeUrl: 'http://localhost:3030',
          keyPath: `${process.env.HOME}/.near/validator_key.json`,
          walletUrl: 'http://localhost:4000/wallet',
          contractName: CONTRACT_NAME
        };
      case 'test':
      case 'ci':
        return {
          networkId: 'shared-test',
          nodeUrl: 'https://rpc.ci-testnet.near.org',
          contractName: CONTRACT_NAME,
          masterAccount: 'test.near'
        };
      case 'ci-betanet':
        return {
          networkId: 'shared-test-staging',
          nodeUrl: 'https://rpc.ci-betanet.near.org',
          contractName: CONTRACT_NAME,
          masterAccount: 'test.near'
        };
      default:
        throw Error(`Unconfigured environment '${env}'. Can be configured in src/config.js.`);
    }
  }
  
  module.exports = getConfig;
  