/// <summary>
/// mint tokens is called when a user wishes to purchase tokens
/// </summary>
/// <returns></returns>
public static bool MintTokens()
{
object[] transactionData = Helpers.GetTransactionAndSaleData();
Transaction tx = (Transaction)transactionData[0];
byte[] sender = (byte[])transactionData[1];
byte[] receiver = (byte[])transactionData[2];
ulong receivedNEO = (ulong)transactionData[3];
ulong receivedGAS = (ulong)transactionData[4];
BigInteger whiteListGroupNumber = (BigInteger)transactionData[5];
BigInteger crowdsaleAvailableAmount = (BigInteger)transactionData[6];
BigInteger groupMaximumContribution = (BigInteger)transactionData[7];
BigInteger totalTokensPurchased = (BigInteger)transactionData[8];
BigInteger neoRemainingAfterPurchase = (BigInteger)transactionData[9];
BigInteger gasRemainingAfterPurchase = (BigInteger)transactionData[10];
BigInteger totalContributionBalance = (BigInteger)transactionData[11];
if (Helpers.GetBlockTimestamp() >= ICOTemplate.PublicSaleEndTime())
{
Runtime.Notify("MintTokens() failed. Token Sale is closed.", false);
return(false);
}
if (!CanUserParticipateInSale(transactionData))
{
Runtime.Notify("MintTokens() CanUserParticipate failed", false);
return(false);
}
byte[] lastTransactionHash = Storage.Get(Storage.CurrentContext, StorageKeys.MintTokensLastTX());
if (lastTransactionHash == tx.Hash)
{
// ensure that minTokens doesnt process the same transaction more than once
Runtime.Notify("MintTokens() not processing duplicate tx.Hash", tx.Hash);
return(false);
}
Storage.Put(Storage.CurrentContext, StorageKeys.MintTokensLastTX(), tx.Hash);
Runtime.Notify("MintTokens() receivedNEO / receivedGAS", receivedNEO, receivedGAS);
if (neoRemainingAfterPurchase > 0 || gasRemainingAfterPurchase > 0)
{
// this purchase would have exceed the allowed max supply so we spent what we could and will refund the remainder
refund(sender, neoRemainingAfterPurchase, gasRemainingAfterPurchase);
}
BigInteger senderAmountSubjectToVesting = SubjectToVestingPeriod(sender);
BigInteger newTokenBalance = NEP5.BalanceOf(sender) + totalTokensPurchased + senderAmountSubjectToVesting;
Helpers.SetBalanceOf(sender, newTokenBalance);
Helpers.SetBalanceOfSaleContribution(sender, totalContributionBalance);
Helpers.SetTotalSupply(totalTokensPurchased);
transfer(null, sender, totalTokensPurchased);
return(true);
}