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| // SPDX-License-Identifier: MIT
pragma solidity 0.8.16;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "./interfaces/IKeyProtocolVariables.sol";
import "./interfaces/ILandXNFT.sol";
import "./interfaces/IxTokenRouter.sol";
import "./interfaces/IOraclePrices.sol";
import "./interfaces/IRentFoundation.sol";
import "./interfaces/IcToken.sol";
import "./interfaces/IxToken.sol";
import "./interfaces/ILNDX.sol";
contract RentFoundation is IRentFoundation, Context, Ownable {
struct deposit {
uint256 timestamp;
uint256 amount; // in kg
int256 depositBalance; //in kg
}
IERC20 public immutable usdc;
address public immutable lndx;
ILandXNFT public landXNFT; //address of landXNFT
IOraclePrices public grainPrices;
IxTokenRouter public xTokenRouter; // address of xTokenRouter
IKeyProtocolVariables public keyProtocolValues;
mapping(uint256 => deposit) public deposits;
mapping(uint256 => bool) public initialRentApplied;
mapping(uint256 => bool) public spentSecurityDeposit;
address public distributor;
string[] public crops = ["SOY", "WHEAT", "CORN", "RICE"];
event rentPaid(uint256 tokenID, uint256 amount);
event initialRentPaid(uint256 tokenID, uint256 amount);
constructor(
address _usdc,
address _lndx,
address _grainPrices,
address _landXNFT,
address _xTokenRouter,
address _keyProtocolValues,
address _distributor
) {
Erequire(_usdc != address(0), "zero address is not allowed");
Erequire(_lndx != address(0), "zero address is not allowed");
Erequire(_grainPrices != address(0), "zero address is not allowed");
Erequire(_landXNFT != address(0), "zero address is not allowed");
Erequire(_xTokenRouter!= address(0), "zero address is not allowed");
Erequire(_keyProtocolValues != address(0), "zero address is not allowed");
usdc = IERC20(_usdc);
lndx = _lndx;
xTokenRouter = IxTokenRouter(_xTokenRouter);
grainPrices = IOraclePrices(_grainPrices);
landXNFT = ILandXNFT(_landXNFT);
keyProtocolValues = IKeyProtocolVariables(_keyProtocolValues);
distributor = _distributor;
}
// deposit rent for token ID, in USDC
function payRent(uint256 tokenID, uint256 amount) public {
require(initialRentApplied[tokenID], "Initial rent was not applied");
if (msg.sender == keyProtocolValues.xTokensSecurityWallet()) {
require(!spentSecurityDeposit[tokenID], "securityDeposit is already spent");
spentSecurityDeposit[tokenID] = true;
}
require(
usdc.transferFrom(msg.sender, address(this), amount),
"transfer failed"
);
uint256 platformFee = (amount * keyProtocolValues.payRentFee()) / 10000; // 100% = 10000
uint256 validatorFee = (amount *
keyProtocolValues.validatorCommission()) / 10000; // 100% = 10000
usdc.transfer(
keyProtocolValues.hedgeFundWallet(),
((amount - platformFee - validatorFee) *
keyProtocolValues.hedgeFundAllocation()) / 10000 // 100% = 10000
);
usdc.transfer(
keyProtocolValues.validatorCommisionWallet(),
validatorFee
);
uint256 grainAmount = (amount - platformFee - validatorFee) * 10 ** 3 / //grainPrices.prices returns price per megatonne, so to get amount in KG we multiply by 10 ** 3
grainPrices.prices(landXNFT.crop(tokenID));
_feeDistributor(platformFee);
deposits[tokenID].amount += grainAmount;
emit rentPaid(tokenID, grainAmount);
}
// prepay initial rent after sharding in kg
function payInitialRent(uint256 tokenID, uint256 amount) external {
string memory crop = landXNFT.crop(tokenID);
require(
!initialRentApplied[tokenID],
"Initial Paymant already applied"
);
require(
xTokenRouter.getXToken(crop) == msg.sender,
"not initial payer"
);
deposits[tokenID].timestamp = block.timestamp;
deposits[tokenID].amount = amount;
initialRentApplied[tokenID] = true;
spentSecurityDeposit[tokenID] = false;
emit initialRentPaid(tokenID, amount);
}
function getDepositBalance(uint256 tokenID) public view returns (int256) {
uint256 elapsedSeconds = block.timestamp - deposits[tokenID].timestamp;
uint256 delimeter = 365 * 1 days;
uint256 rentPerSecond = (landXNFT.cropShare(tokenID) *
landXNFT.tillableArea(tokenID) * 10 ** 3) / delimeter; // multiply by 10**3 to not loose precision
return
int256(deposits[tokenID].amount) -
int256(rentPerSecond * elapsedSeconds / 10 ** 7); // landXNFT.tillableArea returns area in square meters(so we divide by 10 ** 4 to get Ha) and diivide by 10 ** 3 from previous step
}
// Check and return remainig rent paid
function buyOut(uint256 tokenID) external returns(uint256) {
string memory crop = landXNFT.crop(tokenID);
require(
initialRentApplied[tokenID],
"Initial Paymant isn't applied"
);
require(
xTokenRouter.getXToken(crop) == msg.sender,
"not initial payer"
);
int256 depositBalance = getDepositBalance(tokenID); //KG
if (depositBalance < 0) {
revert("NFT has a debt");
}
uint256 usdcAmount = (uint256(depositBalance) * grainPrices.prices(crop)) / (10**3); // price per megatonne and usdc has 6 decimals (10**6 / 10**9)
deposits[tokenID].depositBalance = 0;
deposits[tokenID].amount = 0;
deposits[tokenID].timestamp = 0;
initialRentApplied[tokenID] = false;
usdc.transfer(msg.sender, usdcAmount);
return usdcAmount;
}
function buyOutPreview(uint256 tokenID) external view returns(bool, uint256) {
string memory crop = landXNFT.crop(tokenID);
require(
initialRentApplied[tokenID],
"Initial Paymant isn't applied"
);
require(
xTokenRouter.getXToken(crop) == msg.sender,
"not initial payer"
);
int256 depositBalance = getDepositBalance(tokenID); //KG
if (depositBalance < 0) {
return (false, 0);
}
uint256 usdcAmount = (uint256(depositBalance) * grainPrices.prices(crop)) / (10**3); // price per megatonne and usdc has 6 decimals (10**6 / 10**9)
return (true, usdcAmount);
}
function sellCToken(address account, uint256 amount) public {
string memory crop = IcToken(msg.sender).crop();
require(xTokenRouter.getCToken(crop) == msg.sender, "no valid cToken");
uint256 usdcAmount = (amount * grainPrices.prices(crop)) / (10**9);
uint256 sellTokenFee = (usdcAmount *
keyProtocolValues.cTokenSellFee()) / 10000; // 100% = 10000
usdc.transfer(account, usdcAmount - sellTokenFee);
_feeDistributor(sellTokenFee);
}
function _feeDistributor(uint256 _fee) internal {
uint256 lndxFee = (_fee * keyProtocolValues.lndxHoldersPercentage()) /
10000;
uint256 operationalFee = (_fee *
keyProtocolValues.landXOperationsPercentage()) / 10000; // 100% = 10000
usdc.transfer(lndx, lndxFee);
ILNDX(lndx).feeToDistribute(lndxFee);
usdc.transfer(
keyProtocolValues.landxOperationalWallet(),
operationalFee
);
usdc.transfer(
keyProtocolValues.landxChoiceWallet(),
_fee - lndxFee - operationalFee
);
}
function previewSurplusUSDC() public view returns(uint256) {
uint256 totalUsdcYield;
for (uint i=0; i<crops.length; i++) {
address xTokenAddress = xTokenRouter.getXToken(crops[i]);
uint amount = IxToken(xTokenAddress).previewNonDistributedYield();
uint usdcYield = (amount * grainPrices.prices(crops[i])) / (10**9);
totalUsdcYield += usdcYield;
}
return totalUsdcYield;
}
function _getSurplusUSDC() internal returns(uint256) {
uint totalUsdcYield;
for (uint i=0; i<crops.length; i++) {
address xTokenAddress = xTokenRouter.getXToken(crops[i]);
uint amount = IxToken(xTokenAddress).getNonDistributedYield();
uint usdcYield = (amount * grainPrices.prices(crops[i])) / (10**9);
totalUsdcYield += usdcYield;
}
return totalUsdcYield;
}
function withdrawSurplusUSDC(uint _amount) public {
require(msg.sender == distributor, "only distributor can withdraw");
require(_getSurplusUSDC() >= _amount && _amount < usdc.balanceOf(address(this)), "not enough surplus funds");
usdc.transfer(distributor, _amount);
}
function updateDistributor(address _distributor) public onlyOwner {
distributor = _distributor;
}
function updateCrops(string[] memory _crops) public onlyOwner {
crops = _crops;
}
function setXTokenRouter(address _router) public onlyOwner {
require(_router != address(0), "zero address is not allowed");
xTokenRouter = IxTokenRouter(_router);
}
function setGrainPrices(address _grainPrices) public onlyOwner {
require(_grainPrices != address(0), "zero address is not allowed");
grainPrices = IOraclePrices(_grainPrices);
}
// change the address of landxNFT.
function changeLandXNFTAddress(address _newAddress) public onlyOwner {
require(_newAddress != address(0), "zero address is not allowed");
landXNFT = ILandXNFT(_newAddress);
}
function renounceOwnership() public view override EonlyOwner {
revert ("can 't renounceOwnership here");
}
}
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