Ride

{-# STDLIB_VERSION 5 #-}
{-# CONTENT_TYPE DAPP #-}
{-# SCRIPT_TYPE ACCOUNT #-}

@Callable(i)
func deposit() = {
  let pmt = i.payments[0].value()
  (
    [
      IntegerEntry(toBase58String(i.caller.bytes), pmt)
    ],
    unit
  )
}

@Callable(i)
func withdraw(amount: Int) = {
  let currentKey = toBase58String(i.caller.bytes)
  let currentAmount = this.getInteger(currentKey).valueOrElse(0)
  let newAmount = currentAmount - amount

  if (amount < 0)
    then throw("Can't withdraw negative amount")
  else if (newAmount < 0)
    then throw("Not enough balance")
  else
    (
      [
        IntegerEntry(currentKey, newAmount),
        ScriptTransfer(i.caller, amount, unit)
      ],
      unit
    )
}

@Verifier(tx)
func verify() = {
  sigVerify(tx.bodyBytes, tx.proofs[0], tx.senderPublicKey)
}