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smart-contracts/setting dynamic amount to the external function 🥑 #28

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Nov 27, 2022
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smart-contracts/setting dynamic amount to the external function 🥑 #28

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11 changes: 7 additions & 4 deletions smart-contracts/contracts/CoinFlip.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@ contract CoinFlip is VRFV2WrapperConsumerBase {
event CoinFlipResult(unit256 requestId, bool didWin);
// check each user status
struct CoinFlipStatus {
uint stakedAmount;
uint256 fees;
uint256 randomWord;
address player;
Expand All @@ -33,7 +34,7 @@ contract CoinFlip is VRFV2WrapperConsumerBase {
address constant vrfWrapperAddress = 0x99aFAf084eBA697E584501b8Ed2c0B37Dd136693;

//entry fee [update on function on the frontend later on]
uint128 constant entryFees = 0.01 ether;
// uint128 constant entryFees = 0.01 ether;

// gas limit to spare in LINK
uint32 constant callbackGasLimit = 1_000_000;
Expand All @@ -49,12 +50,13 @@ contract CoinFlip is VRFV2WrapperConsumerBase {

}
// flip function
function flip(CoinFlipSelection choice)
function flip(CoinFlipSelection choice, uint amount)
external
payable
returns (uint256) {

// if user already pays the entry fee or staking fee
require(msg.value == entryFees, "Entry Fees not sent");
require(msg.value == amount, "Entry Fees not sent");

// then request randomness
uint256 requestId = requestRandomness(
Expand All @@ -65,6 +67,7 @@ contract CoinFlip is VRFV2WrapperConsumerBase {

// update coinflipstatus with the requestId
statuses[requestId] = CoinFlipStatus({
stakedAmount: amount
fees : VRF_V2_WRAPPER.calculateRequestPrice(callbackGasLimit),
randomWord : 0;
player : msg.sender;
Expand Down Expand Up @@ -99,7 +102,7 @@ contract CoinFlip is VRFV2WrapperConsumerBase {
// pay *2 of staked amount if user win
if (statuses[requestId].choice == result) {
statuses[request].didWin = true;
payable(statuses[requestId].player).transfer(entryFees * 2);
payable(statuses[requestId].player).transfer(statuses[requestId].stakedAmount * 2);
}
emit CoinFlipResult(requestId, statuses[requestId].didWin);

Expand Down