LOTStaking

{{
  "language": "Solidity",
  "sources": {
    "src/LOTStaking.sol": {
      "content": "// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "./ILOTToken.sol";


contract LOTStaking is Ownable, ReentrancyGuard, Pausable {
    using SafeERC20 for IERC20;

    ILOTToken public immutable lotToken;
    
    // Pool configurations
    struct PoolConfig {
        uint256 duration;        
        uint256 apy;            
        uint256 totalStaked;    
        bool active;            
    }
    
    // Staking info for each user
    struct StakeInfo {
        uint256 amount;        
        uint256 poolId;        
        uint256 startTime;      
        uint256 endTime;        
        uint256 lastClaimTime;  
        uint256 rewardsClaimed; 
        bool withdrawn;        
    }
    
    struct YieldSource {
        string name;           
        uint256 amount;         
        uint256 timestamp;    
    }

    mapping(uint256 => PoolConfig) public pools;
    uint256 public poolCount;
    
    mapping(address => StakeInfo[]) public userStakes;
    mapping(address => uint256) public userStakeCount;
    
    YieldSource[] public yieldSources;
    uint256 public totalYieldGenerated;
    
    uint256 public constant ENTRY_FEE = 300;       
    uint256 public constant EXIT_FEE = 400;         
    uint256 public constant EARLY_EXIT_PENALTY = 700; 
    uint256 public constant REWARD_CLAIM_TAX = 300; 
    uint256 public constant EMERGENCY_WITHDRAWAL_FEE = 1200;  
    
    uint256 public constant BURN_PERCENTAGE = 3000;    
    uint256 public constant REWARD_POOL_PERCENTAGE = 5000; 
    uint256 public constant TREASURY_PERCENTAGE = 2000;   
    
    address public treasury;
    address public rewardPool;
    
    uint256 public totalStaked;
    uint256 public totalRewardsDistributed;
    uint256 public totalFeesBurned;
    uint256 public totalFeesCollected;
    
    event Staked(address indexed user, uint256 indexed stakeId, uint256 poolId, uint256 amount, uint256 afterFee);
    event Unstaked(address indexed user, uint256 indexed stakeId, uint256 amount, uint256 fee);
    event RewardsClaimed(address indexed user, uint256 indexed stakeId, uint256 reward, uint256 tax);
    event PoolCreated(uint256 indexed poolId, uint256 duration, uint256 apy);
    event PoolStatusChanged(uint256 indexed poolId, bool active);
    event YieldSourceAdded(string name, uint256 amount);
    event FeesDistributed(uint256 burned, uint256 toRewardPool, uint256 toTreasury);
    event EmergencyWithdrawal(address indexed user, uint256 amount);

    constructor(
        address _treasury,
        address _rewardPool
    ) Ownable(msg.sender){
        lotToken = ILOTToken(0x115b621cA7eAD65198Dd8BB14f788f1695c74CF7);
        require(_treasury != address(0), "Invalid treasury address");
        require(_rewardPool != address(0), "Invalid reward pool address");
        
        treasury = _treasury;
        rewardPool = _rewardPool;
        
        _createDefaultPools();
    }

   
    function _createDefaultPools() internal {
        pools[0] = PoolConfig({
            duration: 4 * 7 * 24 * 60 * 60, 
            apy: 300, 
            totalStaked: 0,
            active: true
        });
        
        pools[1] = PoolConfig({
            duration: 8 * 7 * 24 * 60 * 60, 
            apy: 500, 
            totalStaked: 0,
            active: true
        });
        
        pools[2] = PoolConfig({
            duration: 12 * 7 * 24 * 60 * 60, 
            apy: 700, 
            totalStaked: 0,
            active: true
        });
        
        pools[3] = PoolConfig({
            duration: 4 * 30 * 24 * 60 * 60,
            apy: 900, 
            totalStaked: 0,
            active: true
        });
        
        poolCount = 4;
        
        for (uint256 i = 0; i < poolCount; i++) {
            emit PoolCreated(i, pools[i].duration, pools[i].apy);
        }
    }

   
    function stake(uint256 amount, uint256 poolId) external nonReentrant whenNotPaused {
        require(amount > 0, "Amount must be greater than 0");
        require(poolId < poolCount, "Invalid pool ID");
        require(pools[poolId].active, "Pool is not active");
        
        PoolConfig storage pool = pools[poolId];
        
        uint256 entryFee = (amount * ENTRY_FEE) / 10000;
        uint256 stakeAmount = amount - entryFee;
        
        require(stakeAmount > 0, "Stake amount too small");
        
        IERC20(address(lotToken)).safeTransferFrom(msg.sender, address(this), amount);
         
        uint256 stakeId = userStakeCount[msg.sender];
        userStakes[msg.sender].push(StakeInfo({
            amount: stakeAmount,
            poolId: poolId,
            startTime: block.timestamp,
            endTime: block.timestamp + pool.duration,
            lastClaimTime: block.timestamp,
            rewardsClaimed: 0,
            withdrawn: false
        }));
        
        userStakeCount[msg.sender]++;
        pool.totalStaked += stakeAmount;
        totalStaked += stakeAmount;

        _distributeFees(entryFee, "Entry Fee");
        
        emit Staked(msg.sender, stakeId, poolId, amount, stakeAmount);
    }

   
    function unstake(uint256 stakeId) external nonReentrant {
        require(stakeId < userStakeCount[msg.sender], "Invalid stake ID");
        
        StakeInfo storage stakeInfo = userStakes[msg.sender][stakeId];
        require(!stakeInfo.withdrawn, "Already withdrawn");
        require(stakeInfo.amount > 0, "No stake found");
        
        uint256 pendingRewards = calculatePendingRewards(msg.sender, stakeId);
        
        bool isEarly = block.timestamp < stakeInfo.endTime;
        uint256 exitFee;
        
        if (isEarly) {
            exitFee = (stakeInfo.amount * EARLY_EXIT_PENALTY) / 10000;
        } else {
            exitFee = (stakeInfo.amount * EXIT_FEE) / 10000;
        }
        
        uint256 withdrawAmount = stakeInfo.amount - exitFee;
        

        
        stakeInfo.withdrawn = true;
        
        pools[stakeInfo.poolId].totalStaked -= stakeInfo.amount;
        totalStaked -= stakeInfo.amount;

        _distributeFees(exitFee, isEarly ? "Early Exit Penalty" : "Exit Fee");
        
        IERC20(address(lotToken)).safeTransfer(msg.sender, withdrawAmount);
        
        if (pendingRewards > 0) {
            _claimRewards(msg.sender, stakeId, pendingRewards);
        }
        
        emit Unstaked(msg.sender, stakeId, withdrawAmount, exitFee);
    }

    
    function claimRewards(uint256 stakeId) external nonReentrant {
        require(stakeId < userStakeCount[msg.sender], "Invalid stake ID");
        
        StakeInfo storage stakeInfo = userStakes[msg.sender][stakeId];
        require(!stakeInfo.withdrawn, "Stake already withdrawn");
        
        uint256 pendingRewards = calculatePendingRewards(msg.sender, stakeId);
        require(pendingRewards > 0, "No rewards to claim");
        
        _claimRewards(msg.sender, stakeId, pendingRewards);
    }

   
    function _claimRewards(address user, uint256 stakeId, uint256 rewardAmount) internal {
        StakeInfo storage stakeInfo = userStakes[user][stakeId];
        
        uint256 claimTax = (rewardAmount * REWARD_CLAIM_TAX) / 10000;
        uint256 netReward = rewardAmount - claimTax;
        
        stakeInfo.lastClaimTime = block.timestamp;
        stakeInfo.rewardsClaimed += rewardAmount;
        
        totalRewardsDistributed += rewardAmount;
        
        _distributeFees(claimTax, "Reward Claim Tax");
        
        IERC20(address(lotToken)).safeTransfer(user, netReward);
        
        emit RewardsClaimed(user, stakeId, netReward, claimTax);
    }

   
    function _distributeFees(uint256 feeAmount, string memory feeType) internal {
        if (feeAmount == 0) return;
        
        uint256 burnAmount = (feeAmount * BURN_PERCENTAGE) / 10000;
        uint256 rewardPoolAmount = (feeAmount * REWARD_POOL_PERCENTAGE) / 10000;
        uint256 treasuryAmount = feeAmount - burnAmount - rewardPoolAmount;
        
        // Burn tokens
        if (burnAmount > 0) {
            lotToken.burn(burnAmount);
            totalFeesBurned += burnAmount;
        }
        
        // Send to reward pool
        if (rewardPoolAmount > 0) {
            IERC20(address(lotToken)).safeTransfer(rewardPool, rewardPoolAmount);
            _addYieldSource(string(abi.encodePacked("Fee Distribution: ", feeType)), rewardPoolAmount);
        }
        
        // Send to treasury
        if (treasuryAmount > 0) {
            IERC20(address(lotToken)).safeTransfer(treasury, treasuryAmount);
        }
        
        totalFeesCollected += feeAmount;
        
        emit FeesDistributed(burnAmount, rewardPoolAmount, treasuryAmount);
    }

    /**
     * @dev Calculate pending rewards for a stake
     */
   function calculatePendingRewards(address user, uint256 stakeId) public view returns (uint256) {
    if (stakeId >= userStakeCount[user]) return 0;
    
    StakeInfo storage stakeInfo = userStakes[user][stakeId];
    if (stakeInfo.withdrawn || stakeInfo.amount == 0) return 0;
    
    PoolConfig storage pool = pools[stakeInfo.poolId];
    
    // Calculate time since last claim
    uint256 rewardEndTime = block.timestamp < stakeInfo.endTime 
        ? block.timestamp 
        : stakeInfo.endTime;
    
    // Don't allow rewards beyond pool end time
    if (rewardEndTime <= stakeInfo.lastClaimTime) return 0;
    
    uint256 stakingTime = rewardEndTime - stakeInfo.lastClaimTime;
    

    uint256 reward = (stakeInfo.amount * pool.apy * stakingTime) / (365 days * 10000);
    
    return reward;
}

    /**
     * @dev Add yield source for PoY tracking
     */
    function addYieldSource(string memory name, uint256 amount) external onlyOwner {
        _addYieldSource(name, amount);
    }

    /**
     * @dev Internal function to add yield source
     */
    function _addYieldSource(string memory name, uint256 amount) internal {
        yieldSources.push(YieldSource({
            name: name,
            amount: amount,
            timestamp: block.timestamp
        }));
        
        totalYieldGenerated += amount;
        
        emit YieldSourceAdded(name, amount);
    }

    /**
     * @dev Get user's all stakes
     */
    function getUserStakes(address user) external view returns (StakeInfo[] memory) {
        return userStakes[user];
    }

    /**
     * @dev Get pool information
     */
    function getPoolInfo(uint256 poolId) external view returns (PoolConfig memory) {
        require(poolId < poolCount, "Invalid pool ID");
        return pools[poolId];
    }

    /**
     * @dev Get all pools information
     */
    function getAllPools() external view returns (PoolConfig[] memory) {
        PoolConfig[] memory allPools = new PoolConfig[](poolCount);
        for (uint256 i = 0; i < poolCount; i++) {
            allPools[i] = pools[i];
        }
        return allPools;
    }

    /**
     * @dev Get yield sources for PoY
     */
    function getYieldSources() external view returns (YieldSource[] memory) {
        return yieldSources;
    }

    /**
     * @dev Get contract statistics
     */
    function getContractStats() external view returns (
        uint256 totalStaked_,
        uint256 totalRewardsDistributed_,
        uint256 totalFeesBurned_,
        uint256 totalFeesCollected_,
        uint256 totalYieldGenerated_,
        uint256 contractBalance
    ) {
        totalStaked_ = totalStaked;
        totalRewardsDistributed_ = totalRewardsDistributed;
        totalFeesBurned_ = totalFeesBurned;
        totalFeesCollected_ = totalFeesCollected;
        totalYieldGenerated_ = totalYieldGenerated;
        contractBalance = lotToken.balanceOf(address(this));
    }

    /**
     * @dev Create new staking pool (admin only)
     */
    function createPool(uint256 duration, uint256 apy) external onlyOwner {
        pools[poolCount] = PoolConfig({
            duration: duration,
            apy: apy,
            totalStaked: 0,
            active: true
        });
        
        emit PoolCreated(poolCount, duration, apy);
        poolCount++;
    }

    /**
     * @dev Toggle pool status
     */
    function togglePoolStatus(uint256 poolId) external onlyOwner {
        require(poolId < poolCount, "Invalid pool ID");
        pools[poolId].active = !pools[poolId].active;
        emit PoolStatusChanged(poolId, pools[poolId].active);
    }

    /**
     * @dev Update treasury address
     */
    function updateTreasury(address newTreasury) external onlyOwner {
        require(newTreasury != address(0), "Invalid treasury address");
        treasury = newTreasury;
    }

    /**
     * @dev Update reward pool address
     */
    function updateRewardPool(address newRewardPool) external onlyOwner {
        require(newRewardPool != address(0), "Invalid reward pool address");
        rewardPool = newRewardPool;
    }

    /**
     * @dev Pause contract
     */
    function pause() external onlyOwner {
        _pause();
    }

    /**
     * @dev Unpause contract
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    /**
     * @dev Emergency withdrawal for users (testnet safety)
     */
function emergencyWithdraw(uint256 stakeId) external nonReentrant {
    require(paused(), "Only available when paused");
    require(stakeId < userStakeCount[msg.sender], "Invalid stake ID");
    
    StakeInfo storage stakeInfo = userStakes[msg.sender][stakeId];
    require(!stakeInfo.withdrawn, "Already withdrawn");
    require(stakeInfo.amount > 0, "No stake found");
    
    // Calculate emergency withdrawal fee
    uint256 emergencyFee = (stakeInfo.amount * EMERGENCY_WITHDRAWAL_FEE) / 10000;
    uint256 withdrawAmount = stakeInfo.amount - emergencyFee;
    
    // Update state first
    stakeInfo.withdrawn = true;
    pools[stakeInfo.poolId].totalStaked -= stakeInfo.amount;
    totalStaked -= stakeInfo.amount;
    
    // Distribute emergency fee
    _distributeFees(emergencyFee, "Emergency Withdrawal Fee");
    
    // Transfer reduced amount back to user
    IERC20(address(lotToken)).safeTransfer(msg.sender, withdrawAmount);
    
    emit EmergencyWithdrawal(msg.sender, withdrawAmount);
}

    /**
     * @dev Admin emergency withdrawal (testnet only)
     */
    function adminEmergencyWithdraw(uint256 amount) external onlyOwner nonReentrant{
        require(amount <= lotToken.balanceOf(address(this)), "Insufficient balance");
        IERC20(address(lotToken)).safeTransfer(owner(), amount);
    }

    /**
 * @dev Get specific stake info for a user
 */
function getStake(address user, uint256 stakeId) external view returns (
    uint256 amount,
    uint256 poolId,
    uint256 startTime,
    uint256 endTime,
    uint256 lastClaimTime,
    uint256 rewardsClaimed,
    bool withdrawn
) {
    require(stakeId < userStakeCount[user], "Invalid stake ID");

    StakeInfo storage stakeInfo = userStakes[user][stakeId];
    return (
        stakeInfo.amount,
        stakeInfo.poolId,
        stakeInfo.startTime,
        stakeInfo.endTime,
        stakeInfo.lastClaimTime,
        stakeInfo.rewardsClaimed,
        stakeInfo.withdrawn
    );
}

}
"
    },
    "lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}
"
    },
    "lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}
"
    },
    "lib/openzeppelin-contracts/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
"
    },
    "lib/openzeppelin-contracts/contracts/utils/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}
"
    },
    "lib/openzeppelin-contracts/contracts/utils/Pausable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    bool private _paused;

    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}
"
    },
    "src/ILOTToken.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;


interface ILOTToken {
    function burn(uint256 amount) external;
    function transfer(address to, uint256 amount) external returns (bool);
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
    function balanceOf(address account) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    // Add other functions from your ABI
}"
    },
    "lib/openzeppelin-contracts/contracts/interfaces/IERC1363.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}
"
    },
    "lib/openzeppelin-contracts/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
"
    },
    "lib/openzeppelin-contracts/contracts/interfaces/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";
"
    },
    "lib/openzeppelin-contracts/contracts/interfaces/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";
"
    },
    "lib/openzeppelin-contracts/contracts/utils/introspection/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
"
    }
  },
  "settings": {
    "remappings": [
      "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
      "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
      "forge-std/=lib/openzeppelin-contracts/lib/forge-std/src/",
      "halmos-cheatcodes/=lib/openzeppelin-contracts/lib/halmos-cheatcodes/src/",
      "openzeppelin-contracts/=lib/openzeppelin-contracts/"
    ],
    "optimizer": {
      "enabled": false,
      "runs": 200
    },
    "metadata": {
      "useLiteralContent": false,
      "bytecodeHash": "ipfs",
      "appendCBOR": true
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "evmVersion": "cancun",
    "viaIR": false
  }
}}