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feat: free first party card bonding curve #373

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feat: free first party card bonding curve #373

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3325848
allow for a discount to be given for the first party card
arr00 Jan 30, 2024
b2dcd5a
impl complete
arr00 Jan 30, 2024
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49 changes: 37 additions & 12 deletions contracts/authorities/BondingCurveAuthority.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ contract BondingCurveAuthority {
error SellZeroPartyCards();
error DistributionsNotSupported();
error NeedAtLeastOneHost();
error InvalidDiscount();

event BondingCurvePartyCreated(
Party indexed party,
Expand Down Expand Up @@ -94,6 +95,8 @@ contract BondingCurveAuthority {
// The value of b in the bonding curve formula 1 ether * x ** 2 / a + b
// used by the Party to price cards
uint80 b;
// Discount when buying/selling the first card in the party
uint80 firstCardDiscount;
}

/// @notice Struct containing info stored for a party
Expand All @@ -110,6 +113,8 @@ contract BondingCurveAuthority {
// The value of b in the bonding curve formula 1 ether * x ** 2 / a + b
// used by the Party to price cards
uint80 b;
// Discount when buying/selling the first card in the party
uint80 firstCardDiscount;
}

modifier onlyPartyDao() {
Expand Down Expand Up @@ -153,6 +158,10 @@ contract BondingCurveAuthority {
address[] memory authorities = new address[](1);
authorities[0] = address(this);

if (partyOpts.firstCardDiscount > partyOpts.b) {
revert InvalidDiscount();
}

_validateGovernanceOpts(partyOpts.opts);

party = partyOpts.partyFactory.createParty(
Expand All @@ -173,7 +182,8 @@ contract BondingCurveAuthority {
supply: 0,
creatorFeeOn: partyOpts.creatorFeeOn,
a: partyOpts.a,
b: partyOpts.b
b: partyOpts.b,
firstCardDiscount: partyOpts.firstCardDiscount
});

emit BondingCurvePartyCreated(party, msg.sender, partyOpts);
Expand All @@ -198,6 +208,10 @@ contract BondingCurveAuthority {
address[] memory authorities = new address[](1);
authorities[0] = address(this);

if (partyOpts.firstCardDiscount > partyOpts.b) {
revert InvalidDiscount();
}

_validateGovernanceOpts(partyOpts.opts);

party = partyOpts.partyFactory.createPartyWithMetadata(
Expand All @@ -220,7 +234,8 @@ contract BondingCurveAuthority {
supply: 0,
creatorFeeOn: partyOpts.creatorFeeOn,
a: partyOpts.a,
b: partyOpts.b
b: partyOpts.b,
firstCardDiscount: partyOpts.firstCardDiscount
});

emit BondingCurvePartyCreated(party, msg.sender, partyOpts);
Expand Down Expand Up @@ -278,7 +293,8 @@ contract BondingCurveAuthority {
partyInfo.supply,
amount,
partyInfo.a,
partyInfo.b
partyInfo.b,
partyInfo.firstCardDiscount
);
uint256 partyDaoFee = (bondingCurvePrice * partyDaoFeeBps) / BPS;
uint256 treasuryFee = (bondingCurvePrice * treasuryFeeBps) / BPS;
Expand Down Expand Up @@ -321,7 +337,8 @@ contract BondingCurveAuthority {
partyInfo.supply + amount - 1,
1,
partyInfo.a,
partyInfo.b
partyInfo.b,
partyInfo.firstCardDiscount
);

emit PartyCardsBought(
Expand Down Expand Up @@ -365,7 +382,8 @@ contract BondingCurveAuthority {
partyInfo.supply - amount,
amount,
partyInfo.a,
partyInfo.b
partyInfo.b,
partyInfo.firstCardDiscount
);
uint256 partyDaoFee = (bondingCurvePrice * partyDaoFeeBps) / BPS;
uint256 treasuryFee = (bondingCurvePrice * treasuryFeeBps) / BPS;
Expand Down Expand Up @@ -420,7 +438,8 @@ contract BondingCurveAuthority {
partyInfo.supply - amount,
1,
partyInfo.a,
partyInfo.b
partyInfo.b,
partyInfo.firstCardDiscount
);

emit PartyCardsSold(
Expand All @@ -447,7 +466,8 @@ contract BondingCurveAuthority {
partyInfo.supply - amount,
amount,
partyInfo.a,
partyInfo.b
partyInfo.b,
partyInfo.firstCardDiscount
);
uint256 partyDaoFee = (bondingCurvePrice * partyDaoFeeBps) / BPS;
uint256 treasuryFee = (bondingCurvePrice * treasuryFeeBps) / BPS;
Expand All @@ -470,7 +490,8 @@ contract BondingCurveAuthority {
amount,
partyInfo.a,
partyInfo.b,
partyInfo.creatorFeeOn
partyInfo.creatorFeeOn,
partyInfo.firstCardDiscount
);
}

Expand All @@ -488,9 +509,10 @@ contract BondingCurveAuthority {
uint80 amount,
uint32 a,
uint80 b,
bool creatorFeeOn
bool creatorFeeOn,
uint80 firstCardDiscount
) public view returns (uint256) {
uint256 bondingCurvePrice = _getBondingCurvePrice(supply, amount, a, b);
uint256 bondingCurvePrice = _getBondingCurvePrice(supply, amount, a, b, firstCardDiscount);
uint256 partyDaoFee = (bondingCurvePrice * partyDaoFeeBps) / BPS;
uint256 treasuryFee = (bondingCurvePrice * treasuryFeeBps) / BPS;
uint256 creatorFee = (bondingCurvePrice * (creatorFeeOn ? creatorFeeBps : 0)) / BPS;
Expand All @@ -510,8 +532,10 @@ contract BondingCurveAuthority {
uint256 lowerSupply,
uint256 amount,
uint32 a,
uint80 b
uint80 b,
uint80 firstCardDiscount
) internal pure returns (uint256) {
uint256 discount = lowerSupply == 0 ? firstCardDiscount : 0;
// Using the function 1 ether * x ** 2 / a + b
uint256 amountSquared = amount * amount;
return
Expand All @@ -525,7 +549,8 @@ contract BondingCurveAuthority {
6)) /
uint256(a) +
amount *
uint256(b);
uint256(b) -
discount;
}

/**
Expand Down
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