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| // SPDX-License-Identifier: MIT
pragma solidity 0.8.16;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Holder.sol";
import "@uniswap/v3-periphery/contracts/libraries/TransferHelper.sol";
import "@uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol";
import "@uniswap/v3-periphery/contracts/interfaces/IQuoter.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";
//xToken NFT in = shards. xToken in = NFT
//1 xToken = (tillableArea * cropShare) / 10000
contract XToken is Context, ERC20Permit, ERC20Burnable, Ownable, ERC1155Holder, IxToken {
struct Stake {
uint256 amount;
uint256 startTime;
}
string public crop;
address public xBasketContract;
address public lndx;
address public usdc;
ILandXNFT public landXNFT; //address of landXNFT
IxTokenRouter public xTokenRouter; // address of xTokenRouter
IRentFoundation public rentFoundation;
IOraclePrices public oraclePrices;
IKeyProtocolVariables public keyProtocolValues;
ISwapRouter public uniswapRouter;
IQuoter public quoter;
//only the initial owner of the NFT can redeem it
mapping(uint256 => address) public initialOwner;
mapping(address => uint256) public Claimed;
mapping(address => Stake) public Staked;
mapping(address => uint256) public Yield;
mapping(uint256 => uint256) public SecurityDepositedAmount;
Stake public TotalStaked;
uint256 public TotalYield;
Stake public NonStakedTokens;
uint256 public NonDistributedYield;
event Sharded(uint256 nftID, uint256 amount, string name);
event BuyOut(uint256 nftID, uint256 amount, string name);
event TokenStaked(address staker, uint256 amount);
event Unstaked(address staker, uint256 amount);
event YieldClaimed(address staker, uint256 amount);
constructor(
address _landXNFT,
address _lndx,
address _usdc,
address _rentFoundation,
address _xTokenRouter,
address _keyProtocolValues,
address _oraclePrices,
string memory _crop// "SOY, CORN etc",
) ERC20Permit(string(abi.encodePacked("x", _crop))) ERC20("LandX xToken", string(abi.encodePacked("x", _crop))) {
Erequire(_landXNFT != address(0), "zero address is not allowed");
Erequire(_lndx != address(0), "zero address is not allowed");
Erequire(_usdc != address(0), "zero address is not allowed");
Erequire(_rentFoundation != 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");
landXNFT = ILandXNFT(_landXNFT);
crop = _crop;
lndx = _lndx;
usdc = _usdc;
rentFoundation = IRentFoundation(_rentFoundation);
xTokenRouter = IxTokenRouter(_xTokenRouter);
keyProtocolValues = IKeyProtocolVariables(_keyProtocolValues);
oraclePrices = IOraclePrices(_oraclePrices);
quoter = IQuoter(0xb27308f9F90D607463bb33eA1BeBb41C27CE5AB6);
uniswapRouter = ISwapRouter(0xE592427A0AEce92De3Edee1F18E0157C05861564);
}
//deposits an NFT to get shards equivalence
function getShards(uint256 _id) external {
require(
landXNFT.tillableArea(_id) > 0,
"this NFT has no land area set"
);
require(landXNFT.cropShare(_id) > 0, "this NFT has no crop share set");
require(
landXNFT.initialOwner(_id) == msg.sender,
"only initial owner can shard"
);
require(
keccak256(abi.encodePacked(landXNFT.crop(_id))) ==
keccak256(abi.encodePacked(crop)),
"wrong crop"
);
require(
xTokenRouter.getXToken(crop) == address(this),
"tokens are not set for this crop"
);
require(
landXNFT.balanceOf(msg.sender, _id) > 0,
"you must own this NFT"
);
require(
rentFoundation.initialRentApplied(_id) == false,
"rent was already applied"
);
initialOwner[_id] = msg.sender; //set the initial owner
//transfers the nft. must have setApprovalForAll
landXNFT.safeTransferFrom(msg.sender, address(this), _id, 1, "");
uint256 shards = landXNFT.tillableArea(_id) *
(landXNFT.cropShare(_id)) *
(1e6) / 10000; // xTokens has 6 decimal
_mint(address(this), shards);
uint256 fee = _calcFee(shards);
uint256 validatorFee = _validatorFee(_id, shards);
uint256 annualRent = getAnnualRentAmount(_id);
uint256 xTokensAnnualRent = ((annualRent * oraclePrices.prices(crop)) /
oraclePrices.getXTokenPrice(address(this))) * 1e3; // oraclePrices.prices returns price per megatonne, to to get value per KG we multiply by 10 ** 3
uint256 toSecurityDepositsAmount = (xTokensAnnualRent / 12) *
keyProtocolValues.securityDepositMonths();
if (keyProtocolValues.preLaunch()) {
_transfer(
address(this),
keyProtocolValues.landxOperationalWallet(),
xTokensAnnualRent
);
_transfer(
address(this),
keyProtocolValues.landxOperationalWallet(),
fee
);
} else {
// transfer xTokens to securityDeposit
uint256 usdcFee = _convertToUsdc(fee);
uint256 usdcAnnualRent = _convertToUsdc(xTokensAnnualRent);
uint256 toHedgeFund = (usdcAnnualRent *
keyProtocolValues.hedgeFundAllocation()) / 10000;
ERC20(usdc).transfer(
keyProtocolValues.hedgeFundWallet(),
toHedgeFund
);
ERC20(usdc).transfer(
address(rentFoundation),
usdcAnnualRent - toHedgeFund
);
_feeDistributor(usdcFee);
}
_transfer(
address(this),
keyProtocolValues.xTokensSecurityWallet(),
toSecurityDepositsAmount
);
if (landXNFT.validator(_id) != address(0)) {
_transfer(address(this), landXNFT.validator(_id), validatorFee);
}
_transfer(
address(this),
msg.sender,
shards - fee - xTokensAnnualRent - toSecurityDepositsAmount - validatorFee
);
SecurityDepositedAmount[_id] = toSecurityDepositsAmount;
rentFoundation.payInitialRent(_id, annualRent);
_calculateNonDistributedYield();
emit Sharded(_id, shards, symbol());
}
//returns the NFT after if caller has enough xTokens to burn. requires allowance!
function getTheNFT(uint256 _id) external {
require(
initialOwner[_id] == msg.sender,
"only initial owner can redeem the NFT"
);
uint256 remainingRentUSDC;
remainingRentUSDC = rentFoundation.buyOut(_id);
uint256 securityDepositedAmount = SecurityDepositedAmount[_id];
if (rentFoundation.spentSecurityDeposit(_id)) {
securityDepositedAmount = 0;
}
uint256 xTokens = 0;
if (remainingRentUSDC > 0) {
xTokens = _convertToXToken(remainingRentUSDC);
}
uint256 shards = landXNFT.tillableArea(_id) *
landXNFT.cropShare(_id) *
1e6 / 10000; // xToken has 6 decimals
//approval required for xTokensSecurityWalle
if (securityDepositedAmount > 0) {
_burn(keyProtocolValues.xTokensSecurityWallet(), securityDepositedAmount);
}
_burn(address(this), xTokens);
//burns shards!
burn(shards - securityDepositedAmount - xTokens);
_calculateNonDistributedYield();
//transfer the NFTs
landXNFT.safeTransferFrom(address(this), msg.sender, _id, 1, "");
emit BuyOut(_id, shards, symbol());
}
function getTheNFTPreview(uint256 _id) public view returns(uint256) {
bool allow;
uint256 remainingRentUSDC;
(allow, remainingRentUSDC) = rentFoundation.buyOutPreview(_id);
require(allow, "there is a debt");
uint256 securityDepositedAmount = SecurityDepositedAmount[_id];
if (rentFoundation.spentSecurityDeposit(_id)) {
securityDepositedAmount = 0;
}
uint256 xTokens = remainingRentUSDC * 1e6 / oraclePrices.getXTokenPrice(address(this)); //xToken has 6 decimals
uint256 shards = landXNFT.tillableArea(_id) *
landXNFT.cropShare(_id) *
1e6 / 10000; // xToken has 6 decimals
return (shards - securityDepositedAmount - xTokens);
}
function stake(uint256 amount) public {
_transfer(msg.sender, address(this), amount);
uint256 yield = _calculateYield(Staked[msg.sender]);
TotalYield += _calculateTotalYield();
Yield[msg.sender] += yield;
Staked[msg.sender].startTime = block.timestamp;
TotalStaked.startTime = block.timestamp;
TotalStaked.amount += amount;
Staked[msg.sender].amount += amount;
_calculateNonDistributedYield();
emit TokenStaked(msg.sender, amount);
}
function unstake(uint256 amount) public {
Erequire(Staked[msg.sender].amount >= amount);
_transfer(address(this), msg.sender, amount);
claim();
Staked[msg.sender].amount -= amount;
TotalStaked.amount -= amount;
_calculateNonDistributedYield();
emit Unstaked(msg.sender, amount);
}
function claim() public {
address cToken = xTokenRouter.getCToken(crop);
uint256 yield = _calculateYield(Staked[msg.sender]);
TotalYield =
TotalYield +
_calculateTotalYield() -
(Yield[msg.sender] + yield);
IcToken(cToken).mint(msg.sender, (Yield[msg.sender] + yield));
Claimed[msg.sender] += (Yield[msg.sender] + yield);
Staked[msg.sender].startTime = block.timestamp;
TotalStaked.startTime = block.timestamp;
Yield[msg.sender] = 0;
emit YieldClaimed(msg.sender, yield);
}
function _feeDistributor(uint256 _fee) internal {
uint256 lndxFee = (_fee * keyProtocolValues.lndxHoldersPercentage()) /
10000;
uint256 operationalFee = (_fee *
keyProtocolValues.landXOperationsPercentage()) / 10000;
ERC20(usdc).transfer(lndx, lndxFee);
ILNDX(lndx).feeToDistribute(lndxFee);
ERC20(usdc).transfer(
keyProtocolValues.landxOperationalWallet(),
operationalFee
);
ERC20(usdc).transfer(
keyProtocolValues.landxChoiceWallet(),
_fee - lndxFee - operationalFee
);
}
function availableToClaim(address account) public view returns (uint256) {
return Yield[account] + _calculateYield(Staked[account]);
}
function totalAvailableToClaim() public view returns (uint256) {
return TotalYield + _calculateTotalYield();
}
// calculate cTokanes amount generated since amount was staked
function _calculateYield(Stake storage s) internal view returns (uint256) {
uint256 elapsedSeconds = block.timestamp - s.startTime;
uint256 delimeter = 365 * 1 days;
return (s.amount * elapsedSeconds) / delimeter;
}
function _calculateTotalYield() internal view returns (uint256) {
uint256 elapsedSeconds = block.timestamp - TotalStaked.startTime;
uint256 delimeter = 365 * 1 days;
return (TotalStaked.amount * elapsedSeconds) / delimeter;
}
function xBasketTransfer(address _from, uint256 amount) external {
require(msg.sender == xBasketContract, "not authorized");
_transfer(_from, xBasketContract, amount);
}
// change the address of xBasket.
function changeXBasketAddress(address _newAddress) public onlyOwner {
require(_newAddress != address(0), "zero address is not allowed");
xBasketContract = _newAddress;
}
function _calcFee(uint256 amount) internal view returns (uint256) {
uint256 fee = keyProtocolValues.xTokenMintFee();
return (amount * fee) / 10000;
}
function _validatorFee(uint256 tokenID, uint256 amount) internal view returns(uint256) {
if (landXNFT.validator(tokenID) == address(0)) {
return 0;
}
uint256 validatorFee = landXNFT.validatorFee(tokenID);
Iif (validatorFee == 0) {
return 0;
}
return (amount* validatorFee) / 10000;
}
function setXTokenRouter(address _router) public onlyOwner {
require(_router != address(0), "zero address is not allowed");
xTokenRouter = IxTokenRouter(_router);
}
// return annual rent amount in kg
function getAnnualRentAmount(uint256 tokenID)
public
view
returns (uint256)
{
uint256 rent = landXNFT.cropShare(tokenID);
uint256 area = landXNFT.tillableArea(tokenID);
return (rent * area) / 10000;
}
function quoteAmountOut(uint _amount) public returns (uint) {
uint amountOut = quoter.quoteExactInputSingle(address(this), usdc, 3000, _amount, 0);
return amountOut;
}
function _convertToXToken(uint256 amount) internal returns (uint256) {
uint256 slippage = keyProtocolValues.buyXTokenSlippage();
uint256 predictedAmountOut = quoter.quoteExactInputSingle(usdc, address(this), 3000, amount, 0);
uint256 minAmountOut = predictedAmountOut * 10000 / (10000 + slippage);
TransferHelper.safeApprove(usdc, address(uniswapRouter), amount);
ISwapRouter.ExactInputSingleParams memory params = ISwapRouter
.ExactInputSingleParams(
usdc,
address(this),
3000,
address(this),
block.timestamp + 15,
amount,
minAmountOut,
0
);
return uniswapRouter.exactInputSingle(params);
}
function _convertToUsdc(uint256 amount) internal returns (uint256) {
uint256 slippage = keyProtocolValues.sellXTokenSlippage();
uint256 predictedAmountOut = quoteAmountOut(amount);
uint256 minAmountOut = predictedAmountOut * 10000 / (10000 + slippage);
TransferHelper.safeApprove(
address(this),
address(uniswapRouter),
amount
);
ISwapRouter.ExactInputSingleParams memory params = ISwapRouter
.ExactInputSingleParams(
address(this),
usdc,
3000,
address(this),
block.timestamp + 15,
amount,
minAmountOut,
0
);
return uniswapRouter.exactInputSingle(params);
}
function preview(uint256 id)
public
view
returns (
uint256,
uint256,
uint256,
uint256
)
{
require(landXNFT.tillableArea(id) > 0, "this NFT has no land area set");
require(landXNFT.cropShare(id) > 0, "this NFT has no crop share set");
require(
keccak256(abi.encodePacked(landXNFT.crop(id))) ==
keccak256(abi.encodePacked(crop)),
"wrong crop"
);
require(
xTokenRouter.getXToken(landXNFT.crop(id)) == address(this),
"Unable to shard this NFT"
);
uint256 shards = (landXNFT.tillableArea(id) *
landXNFT.cropShare(id) *
1e6) / 10000;
uint256 annualRent = getAnnualRentAmount(id);
uint256 xTokensAnnualRent = ((annualRent * oraclePrices.prices(crop)) /
oraclePrices.getXTokenPrice(xTokenRouter.getXToken(crop))) * 1e3;
uint256 toSecurityDepositsAmount = (xTokensAnnualRent / 12) *
keyProtocolValues.securityDepositMonths();
uint256 fee = _calcFee(shards);
uint256 validatorFee = _validatorFee(id, shards);
uint256 toBeReceived = shards -
fee -
xTokensAnnualRent -
toSecurityDepositsAmount - validatorFee;
return (
shards,
fee,
xTokensAnnualRent + toSecurityDepositsAmount,
toBeReceived
);
}
function _calculateNonDistributedYield() internal {
uint256 elapsedSeconds = block.timestamp - NonStakedTokens.startTime;
uint256 delimeter = 365 * 1 days;
NonDistributedYield += NonStakedTokens.amount * elapsedSeconds / delimeter;
NonStakedTokens.amount = totalSupply() - TotalStaked.amount;
NonStakedTokens.startTime = block.timestamp;
}
function previewNonDistributedYield() external view returns(uint256) {
uint256 elapsedSeconds = block.timestamp - NonStakedTokens.startTime;
uint256 delimeter = 365 * 1 days;
return NonDistributedYield + NonStakedTokens.amount * elapsedSeconds / delimeter;
}
// returns cTokens amount
function getNonDistributedYield() external returns(uint256) {
Irequire(msg.sender == address(rentFoundation), "only rentFoundation can take it");
_calculateNonDistributedYield();
uint256 amount = NonDistributedYield;
NonDistributedYield = 0;
return amount;
}
function renounceOwnership() public view override EonlyOwner {
revert ("can 't renounceOwnership here");
}
// for test only purposes
function updateUniswapContracts(address _quoter, address _uniswapRouter) public EonlyOwner {
quoter = IQuoter(_quoter);
uniswapRouter = ISwapRouter(_uniswapRouter);
}
function decimals() public pure override returns (uint8) {
return 6;
}
} |