const BRIDGE_ERROR = {
  MISSING_WEB3: new Error('no web3 object found'),
  MISSING_WALLET: new Error('no wallet found'),
  MISSING_TXN: new Error('no transaction found'),
  MISSING_CONTRACTS: new Error('no contracts found'),
  MISSING_KEYSTORE: new Error('no keystore text found'),
  MISSING_MNEMONIC: new Error('no authentication mnemonic found'),
  MISSING_URBIT_WALLET: new Error('no urbit wallet found'),
  MISSING_POINT: new Error('no point found'),
  INVALID_ROUTE: new Error('invalid route'),
  INVALID_NETWORK_TYPE: new Error('invalid network type'),
  INVALID_WALLET_TYPE: new Error('invalid wallet type'),
}

const renderTxnError = (web3, msg) => {
  const txnCost = (web3, msg) => {
    const costWei = msg.match(/upfront cost is: ([0-9]+)/)
    const costEth = web3.utils.fromWei(costWei[1], 'ether')
    return parseFloat(costEth).toFixed(4)
  }

  const acctBalance = (web3, msg) => {
    const balWei = msg.match(/sender's account only has: ([0-9]+)/)
    const balEth = web3.utils.fromWei(balWei[1], 'ether')
    return parseFloat(balEth).toFixed(4)
  }

  return (
    msg.includes("doesn't have enough funds")

  ? "The account doesn't have enough Ether. " +
    `The up-front transaction cost is ${txnCost(web3, msg)} ETH, but the ` +
    `account only holds ${acctBalance(web3, msg)} ETH.`

  : "You may want to verify that the account that has signed the " +
    "transaction holds sufficient Ether to pay for the gas, and " +
    "also that you haven't set the gas limit for the transaction " +
    "too low."
  )
}

export {
  BRIDGE_ERROR,
  renderTxnError
}