import * as _ from 'lodash';

import { Network } from '../types';

const etherscanPrefix = (networkId: number): string | undefined => {
    switch (networkId) {
        case Network.Kovan:
            return 'kovan.';
        case Network.Mainnet:
            return '';
        default:
            return undefined;
    }
};

export const etherscanUtil = {
    getEtherScanTxnAddressIfExists: (txnHash: string, networkId: number) => {
        const prefix = etherscanPrefix(networkId);
        if (_.isUndefined(prefix)) {
            return;
        }
        return `https://${prefix}etherscan.io/tx/${txnHash}`;
    },
};