import { TransactionObject } from 'web3/eth/types';

type Web3Method<T> = (index: number) => TransactionObject<T>;

export async function collectArrayElements<T>(
  method: Web3Method<T>,
  account: string,
): Promise<T[]> {
  const arrayElements = [];
  let noError = true;
  let index = 0;
  while (noError) {
    try {
      arrayElements.push(await method(index).call({ from: account }));
      index += 1;
    } catch (e) {
      noError = false;
    }
  }
  return arrayElements;
}

interface Web3ErrorResponse {
  code: number;
  message: string;
}

export function web3ErrorToString(err: Web3ErrorResponse): string {
  return err.message
    .split('\n')[0]
    .split(':')
    .slice(-1)[0]
    .trim();
}

export function safeEnable(): Promise<void> {
  const w = typeof window === 'undefined' ? {} : (window as any);
  if (!w.ethereum || !w.ethereum.enable) {
    return Promise.reject('No web3 client installed');
  }

  return w.ethereum.enable();
}