'use strict';
const _ = require('lodash');
const fs = require('fs');
const path = require('path');

function getUserHomePath() {
  return process.env.HOME || process.env.HOMEPATH || process.env.USERPROFILE;
}

function loadWallet() {
  const secretPath = path.join(getUserHomePath(), '.ripple_wallet');
  try {
    const walletRaw = fs.readFileSync(secretPath, {encoding: 'utf8'}).trim();
    return JSON.parse(walletRaw);
  } catch (e) {
    return null;
  }
}

const WALLET = loadWallet();

function getTestKey(key) {
  if (process.env.TEST_ADDRESS && process.env.TEST_SECRET) {
    if (key === 'address') {
      return process.env.TEST_ADDRESS;
    }
    if (key === 'secret') {
      return process.env.TEST_SECRET;
    }
  }
  if (WALLET === null) {
    throw new Error('Could not find .ripple_wallet file in home directory');
  }
  if (WALLET.test === undefined) {
    throw new Error('Wallet does not contain a "test" account');
  }
  return WALLET.test[key];
}

module.exports = {
  getAddress: _.partial(getTestKey, 'address'),
  getSecret: _.partial(getTestKey, 'secret')
};