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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.20;

/**
 * Layout of the contract
 * version
 * imports
 * errors
 * interfaces, libraries, and contracts
 * type declarations
 * state variables
 * events
 * modifiers
 * functions
 *
 * layout of functions
 * constructor
 * receive function
 * fallback function
 * external functions
 * public functions
 * internal functions
 * private functions
 * view functions
 * pure functions
 * getters
 */
import {Strings} from "@openzeppelin/contracts/utils/Strings.sol";
import {FundingVault} from "./FundingVault.sol";
import {VotingPowerToken} from "./VotingPowerToken.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/**
 * @title FairFund
 * @author Aditya Bhattad
 * @notice This is the main FairFund contract that will be used for deployment and keeping track of all the funding vaults.
 */
contract FairFund is Ownable {
    // Errors //
    error FairFund__CannotBeAZeroAddress();
    error FairFund__TallyDateCannotBeInThePast();
    error FairFund__MinRequestableAmountCannotBeGreaterThanMaxRequestableAmount();
    error FairFund__MaxRequestableAmountCannotBeZero();
    error FairFund__TransferFailed(address token, address recepient, uint256 amount);

    // State Variables //
    uint256 private s_fundingVaultIdCounter;
    mapping(uint256 fundingVaultId => address fundingVault) private s_fundingVaults;
    uint256 private s_platformFee;

    // Events //
    event FundingVaultDeployed(address indexed fundingVault);
    event TransferTokens(address indexed token, address indexed recepient, uint256 amount);

    /**
     * @param _platformFee The fee that will be charged by the platform for using the FairFund platform
     */
    constructor(uint256 _platformFee) Ownable(msg.sender) {
        s_platformFee = _platformFee;
    }

    // Functions //

    /**
     * @param _fundingToken The token that will be used to fund the proposals
     * @param _votingToken The token that will be used to vote on the proposals
     * @param _minRequestableAmount The minimum amount that can be requested by a single proposal from the funding vault
     * @param _maxRequestableAmount The maximum amount that can be requested by a single proposal from the funding vault
     * @param _tallyDate The date when the voting will end and the proposals will be tallied
     */
    function deployFundingVault(
        address _fundingToken,
        address _votingToken,
        uint256 _minRequestableAmount,
        uint256 _maxRequestableAmount,
        uint256 _tallyDate
    ) external returns (address) {
        if (_fundingToken == address(0) || _votingToken == address(0)) {
            revert FairFund__CannotBeAZeroAddress();
        }
        if (_tallyDate < block.timestamp) {
            revert FairFund__TallyDateCannotBeInThePast();
        }
        if (_minRequestableAmount > _maxRequestableAmount) {
            revert FairFund__MinRequestableAmountCannotBeGreaterThanMaxRequestableAmount();
        }
        if (_maxRequestableAmount == 0) {
            revert FairFund__MaxRequestableAmountCannotBeZero();
        }

        s_fundingVaultIdCounter++;
        uint256 fundingVaultId = s_fundingVaultIdCounter;
        string memory fundingVaultIdString = Strings.toString(fundingVaultId);
        string memory votingPowerTokenName = string.concat("Voting Power Token ", fundingVaultIdString);
        string memory votingPowerTokenSymbol = string.concat("VOTE_", fundingVaultIdString);
        VotingPowerToken votingPowerToken = new VotingPowerToken(votingPowerTokenName, votingPowerTokenSymbol);
        FundingVault fundingVault = new FundingVault(
            _fundingToken,
            _votingToken,
            address(votingPowerToken),
            _minRequestableAmount,
            _maxRequestableAmount,
            _tallyDate,
            address(this)
        );
        votingPowerToken.transferOwnership(address(fundingVault));
        s_fundingVaults[fundingVaultId] = address(fundingVault);
        emit FundingVaultDeployed(address(fundingVault));
        return address(fundingVault);
    }

    function modityPlatformFee(uint256 _platformFee) external onlyOwner {
        s_platformFee = _platformFee;
    }

    function withdrawPlatformFee(address recepient, address token) external onlyOwner {
        if (recepient == address(0) || token == address(0)) {
            revert FairFund__CannotBeAZeroAddress();
        }
        uint256 platformBalance = IERC20(token).balanceOf(address(this));
        if (platformBalance != 0) {
            bool success = IERC20(token).transfer(recepient, platformBalance);
            if (!success) {
                revert FairFund__TransferFailed(token, recepient, platformBalance);
            }
            emit TransferTokens(token, recepient, platformBalance);
        }
    }

    // Getters //
    function getFundingVault(uint256 _fundingVaultId) external view returns (address) {
        return s_fundingVaults[_fundingVaultId];
    }

    function getTotalNumberOfFundingVaults() external view returns (uint256) {
        return s_fundingVaultIdCounter;
    }

    function getPlatformFee() external view returns (uint256) {
        return s_platformFee;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Strings.sol)

pragma solidity ^0.8.20;

import {Math} from "./math/Math.sol";
import {SignedMath} from "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant HEX_DIGITS = "0123456789abcdef";
    uint8 private constant ADDRESS_LENGTH = 20;

    /**
     * @dev The `value` string doesn't fit in the specified `length`.
     */
    error StringsInsufficientHexLength(uint256 value, uint256 length);

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), HEX_DIGITS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toStringSigned(int256 value) internal pure returns (string memory) {
        return string.concat(value < 0 ? "-" : "", toString(SignedMath.abs(value)));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        uint256 localValue = value;
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = HEX_DIGITS[localValue & 0xf];
            localValue >>= 4;
        }
        if (localValue != 0) {
            revert StringsInsufficientHexLength(value, length);
        }
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal
     * representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return bytes(a).length == bytes(b).length && keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.20;

/**
 * Layout of the contract
 * version
 * imports
 * errors
 * interfaces, libraries, and contracts
 * type declarations
 * state variables
 * events
 * modifiers
 * functions
 *
 * layout of functions
 * constructor
 * receive function
 * fallback function
 * external functions
 * public functions
 * internal functions
 * private functions
 * view functions
 * pure functions
 * getters
 */
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {VotingPowerToken} from "./VotingPowerToken.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import {FairFund} from "./FairFund.sol";

/**
 * @title FundingVault
 * @author Aditya Bhattad
 * @notice  A contract that allows users to deposit funds and vote on proposals, after voting ends anyone can call distributeFunds to distribute the funds to the proposals
 * Whether a proposal is selected for receiving funds is decided using this formula:
 * Let:
 * `V(p)` be the number of votingPowerTokens assigned to proposal `p`
 * `S` be the total supply of votingPowerTokens
 * `R` be the vault's balance of fundingTokens
 *
 * A proposal `p` is accepted iff `R * V(p)/S >= p.minimumAmount`.
 *
 * The funding to be received by an accepted proposal `p` is `min(p.maximumAmount, R * V(p)/S)`.
 * The funding to be received by a rejected proposal `p` is `0`.
 */
contract FundingVault is ReentrancyGuard {
    // Errors //
    error FundingVault__AmountCannotBeZero();
    error FundingVault__MaxRequestableAmountCannotBeLessThanMinRequestableAmount();
    error FundingVault__MinRequestableAmountCannotBeGreaterThanMaxRequestableAmount();
    error FundingVault__CannotBeAZeroAddress();
    error FundingVault__MetadataCannotBeEmpty();
    error FundingVault__AmountExceededsLimit();
    error FundingVault__ProposalDoesNotExist();
    error FundingVault__AlreadyVoted();
    error FundingVault__TallyDateNotPassed();
    error FundingVault__NotEnoughBalance();
    error FundingVault__NoVotingPowerTokenMinted();
    error FundingVault__TransferFailed();
    error FundingVault__AlreadyDistributedFunds();
    error FundingVault__FundsNotDistributedYet();
    error FundingVault__NoFundsToWithdraw();
    error FundingVault__NoRemainingFundsToWithdraw();
    error FundingVault__WithdrawableAmountTooSmall();

    // Type Declarations //
    struct Proposal {
        string metadata;
        uint256 minimumAmount;
        uint256 maximumAmount;
        address recipient;
    }

    // State Variables //
    uint256 private s_proposalIdCounter;
    IERC20 private immutable i_fundingToken;
    IERC20 private immutable i_votingToken;
    VotingPowerToken private immutable i_votingPowerToken;
    FairFund private immutable i_deployer;

    uint256 private s_minRequestableAmount;
    uint256 private s_maxRequestableAmount;
    uint256 private s_totalBalanceAvailableForDistribution;
    uint256 private s_totalFundsDistributed;
    bool private s_fundsDistributed;

    /**
     * @dev The date in which the tally will be taken as seconds since unix epoch
     */
    uint256 private immutable i_tallyDate;

    mapping(address proposer => uint256[] proposalIds) private s_proposerToProposalIds;
    mapping(uint256 proposalId => Proposal proposal) private s_proposals;
    mapping(uint256 proposalId => uint256 votes) private s_votes;
    mapping(address voter => uint256 amountOfVotingTokens) private s_voterToVotingTokens;
    mapping(address user => uint256 amountDeposited) private s_userToDistributionAmountDeposited;

    // Events //
    event FundingTokenDeposited(address indexed from, uint256 indexed amount);
    event RegisteredVoter(address indexed voter, uint256 indexed amount);
    event ProposalSubmitted(address indexed proposer, uint256 indexed proposalId);
    event VotedOnProposal(address indexed voter, uint256 indexed proposalId, uint256 indexed amount);
    event ReleasedTokens(address indexed voter, uint256 indexed amount);
    event FundsDistributed(uint256 indexed proposalId, address indexed recipient, uint256 indexed amount);
    event RemainingFundsWithdrawn(address indexed user, uint256 amount);
    event PlatformFeeSubmitted(address indexed platform, uint256 amount);

    modifier tallyDatePassed() {
        if (block.timestamp < i_tallyDate) {
            revert FundingVault__TallyDateNotPassed();
        }
        _;
    }

    // Functions //

    /**
     * @param _fundingToken The token that will be used to fund the proposals
     * @param _votingToken The token that will be locked against voting power tokens, which allows the user to vote on proposals
     * @param _votingPowerToken The token that will be minted when a user locks their voting tokens
     * @param _minRequestableAmount The minimum amount of token that can be requested in proposal
     * @param _maxRequestableAmount The maximum amount of token that can be requested in proposal
     * @param _tallyDate The date in which the tally will be taken as seconds since unix epoch
     * @param _deployer The address of the main fairfund smart contract
     */
    constructor(
        address _fundingToken,
        address _votingToken,
        address _votingPowerToken,
        uint256 _minRequestableAmount,
        uint256 _maxRequestableAmount,
        uint256 _tallyDate,
        address _deployer
    ) {
        i_tallyDate = _tallyDate;
        i_fundingToken = IERC20(_fundingToken);
        i_votingToken = IERC20(_votingToken);
        i_votingPowerToken = VotingPowerToken(_votingPowerToken);
        s_minRequestableAmount = _minRequestableAmount;
        s_maxRequestableAmount = _maxRequestableAmount;
        s_totalBalanceAvailableForDistribution = 0;
        s_totalFundsDistributed = 0;
        s_fundsDistributed = false;
        i_deployer = FairFund(_deployer);
    }

    /**
     * @dev Allows users to deposit fundingToken into the vault
     * @param _amount The amount of fundingToken to deposit
     */
    function deposit(uint256 _amount) public nonReentrant {
        if (_amount <= 0) {
            revert FundingVault__AmountCannotBeZero();
        }
        s_totalBalanceAvailableForDistribution += _amount;
        i_fundingToken.transferFrom(msg.sender, address(this), _amount);
        s_userToDistributionAmountDeposited[msg.sender] = _amount;
        emit FundingTokenDeposited(msg.sender, _amount);
    }

    /**
     * @dev locks votingToken from the user and mints votingPowerToken
     * @param _amount The amount of votingTokens to lock in order to receive votingPowerTokens
     */
    function register(uint256 _amount) public nonReentrant {
        if (_amount <= 0) {
            revert FundingVault__AmountCannotBeZero();
        }
        if (i_votingToken.balanceOf(msg.sender) < _amount) {
            revert FundingVault__NotEnoughBalance();
        }
        i_votingToken.transferFrom(msg.sender, address(this), _amount);
        i_votingPowerToken.mint(msg.sender, _amount);
        s_voterToVotingTokens[msg.sender] += _amount;

        emit RegisteredVoter(msg.sender, _amount);
    }

    /**
     * @dev Allows users to submit a proposal
     * @param _metadata The metadata of the proposal
     * @param _minimumAmount The minimum amount of fundingToken requested
     * @param _maximumAmount The maximum amount of fundingToken requested
     * @param _recipient The address that will receive the fundingToken if the proposal is accepted
     */
    function submitProposal(string memory _metadata, uint256 _minimumAmount, uint256 _maximumAmount, address _recipient)
        public
        nonReentrant
        returns (uint256)
    {
        if (bytes(_metadata).length == 0) {
            revert FundingVault__MetadataCannotBeEmpty();
        }
        if (_minimumAmount < s_minRequestableAmount || _maximumAmount > s_maxRequestableAmount) {
            revert FundingVault__AmountExceededsLimit();
        }
        if (_minimumAmount > _maximumAmount) {
            revert FundingVault__MinRequestableAmountCannotBeGreaterThanMaxRequestableAmount();
        }
        if (_recipient == address(0)) {
            revert FundingVault__CannotBeAZeroAddress();
        }
        s_proposalIdCounter++;
        s_proposals[s_proposalIdCounter] = Proposal(_metadata, _minimumAmount, _maximumAmount, _recipient);
        s_proposerToProposalIds[msg.sender].push(s_proposalIdCounter);
        emit ProposalSubmitted(msg.sender, s_proposalIdCounter);
        return s_proposalIdCounter;
    }

    /**
     * @dev Allows users to vote on a proposal
     * @param _proposalId The id of the proposal to vote on
     * @param _amount The amount of votingToken to vote with
     */
    function voteOnProposal(uint256 _proposalId, uint256 _amount) public nonReentrant {
        if (_proposalId <= 0 || _proposalId > s_proposalIdCounter) {
            revert FundingVault__ProposalDoesNotExist();
        }
        uint256 votingPower = i_votingPowerToken.balanceOf(msg.sender);
        if (_amount > votingPower) {
            revert FundingVault__AmountExceededsLimit();
        }
        i_votingPowerToken.transferFrom(msg.sender, address(this), _amount);
        s_votes[_proposalId] += _amount;
        emit VotedOnProposal(msg.sender, _proposalId, _amount);
    }

    /**
     * @dev Calculates the amount of fundingToken to be received by a proposal
     * @param _proposalId The id of the proposal to calculate the funding for
     * @return The amount of fundingToken to be received by the proposal
     */
    function calculateFundingToBeReceived(uint256 _proposalId) public view tallyDatePassed returns (uint256) {
        if (_proposalId <= 0 || _proposalId > s_proposalIdCounter) {
            revert FundingVault__ProposalDoesNotExist();
        }

        uint256 totalVotingPowerTokens = i_votingPowerToken.totalSupply();
        if (totalVotingPowerTokens == 0) {
            revert FundingVault__NoVotingPowerTokenMinted();
        }
        // Floating point adjustment:
        // 1.totalVotes is multiplied by 1e18 to avoid rounding errors
        // 2.transferable is divided by 1e18 to get the actual amount
        uint256 totalVotes = s_votes[_proposalId] * 1e18;
        Proposal memory proposal = s_proposals[_proposalId];
        /**
         * Let:
         * `V(p)` be the number of votingPowerTokens assigned to proposal `p`
         * `S` be the total supply of votingPowerTokens
         * `R` be the vault's balance of fundingTokens
         * A proposal `p` is accepted iff `R * V(p)/S >= p.minimumAmount (bug: What if proposer sets the minimum amount to zero, their proposal will always get accepted)`.
         * The funding to be received by an accepted proposal `p` is `min(p.maximumAmount, R * V(p)/S)`.
         * The funding to be received by a rejected proposal `p` is `0`.
         */
        uint256 transferable = (s_totalBalanceAvailableForDistribution * (totalVotes / totalVotingPowerTokens)) / 1e18;

        bool isProposalAccepted = transferable >= proposal.minimumAmount;

        if (isProposalAccepted) {
            if (transferable > proposal.maximumAmount) {
                return proposal.maximumAmount;
            } else {
                return transferable;
            }
        } else {
            return 0;
        }
    }

    /**
     * @dev Distributes the funds to the proposals
     * @notice Can only be called after the tally date has passed
     */
    function distributeFunds() external nonReentrant tallyDatePassed {
        if (s_fundsDistributed) {
            revert FundingVault__AlreadyDistributedFunds();
        }
        s_fundsDistributed = true;
        uint256 platformFeePercentage = i_deployer.getPlatformFee();
        uint256 feeAmount = 0;

        for (uint256 i = 1; i <= s_proposalIdCounter; i++) {
            uint256 amount = calculateFundingToBeReceived(i);
            if (amount > 0) {
                Proposal memory proposal = s_proposals[i];
                uint256 fee = (amount * platformFeePercentage) / 100;
                amount -= fee;
                feeAmount += fee;
                bool success = i_fundingToken.transfer(proposal.recipient, amount);
                if (!success) {
                    revert FundingVault__TransferFailed();
                }
                s_totalFundsDistributed += amount + fee;
                emit FundsDistributed(i, proposal.recipient, amount);
            }
        }
        if (feeAmount > 0) {
            bool success = i_fundingToken.transfer(address(i_deployer), feeAmount);
            if (!success) {
                revert FundingVault__TransferFailed();
            }
            emit PlatformFeeSubmitted(address(i_deployer), feeAmount);
        }
    }

    /**
     * @dev Allows users to release their votingToken after the tally date has passed
     * @notice Can only be called after the tally date has passed
     */
    function releaseVotingTokens() public nonReentrant tallyDatePassed {
        uint256 votingPower = s_voterToVotingTokens[msg.sender];
        if (votingPower <= 0) {
            revert FundingVault__AmountCannotBeZero();
        }
        s_voterToVotingTokens[msg.sender] = 0;
        i_votingToken.transfer(msg.sender, votingPower);
        emit ReleasedTokens(msg.sender, votingPower);
    }

    /**
     * @notice Allows users to withdraw their proportional share of remaining funds after distribution
     * @dev This function can only be called after the tally date has passed and funds have been distributed
     * @dev The function calculates the user's share based on their initial deposit and the remaining funds
     * @dev State changes are made before the transfer to prevent reentrancy
     * @dev Emits a RemainingFundsWithdrawn event upon successful withdrawal
     * @dev This function does not take any parameters as it uses msg.sender to identify the user
     * @custom:throws FundingVault__FundsNotDistributedYet if funds haven't been distributed yet
     * @custom:throws FundingVault__NoFundsToWithdraw if the user has no funds to withdraw
     * @custom:throws FundingVault__NoRemainingFundsToWithdraw if there are no remaining funds to withdraw
     * @custom:throws FundingVault__WithdrawableAmountTooSmall if the calculated withdrawable amount is zero
     * @custom:throws FundingVault__TransferFailed if the token transfer fails
     */
    function withdrawRemaining() public nonReentrant tallyDatePassed {
        if (!s_fundsDistributed) {
            revert FundingVault__FundsNotDistributedYet();
        }

        uint256 userDepositedAmount = s_userToDistributionAmountDeposited[msg.sender];
        if (userDepositedAmount == 0) {
            revert FundingVault__NoFundsToWithdraw();
        }

        uint256 totalDistributableFunds = s_totalBalanceAvailableForDistribution;
        uint256 totalDistributedFunds = s_totalFundsDistributed;

        if (totalDistributableFunds <= totalDistributedFunds) {
            revert FundingVault__NoRemainingFundsToWithdraw();
        }

        uint256 remainingFunds = totalDistributableFunds - totalDistributedFunds;
        uint256 userShareRatio = (userDepositedAmount * 1e18) / totalDistributableFunds;
        uint256 userWithdrawableAmount = (userShareRatio * remainingFunds) / 1e18;

        if (userWithdrawableAmount == 0) {
            revert FundingVault__WithdrawableAmountTooSmall();
        }

        s_userToDistributionAmountDeposited[msg.sender] = 0;

        bool success = i_fundingToken.transfer(msg.sender, userWithdrawableAmount);
        if (!success) {
            revert FundingVault__TransferFailed();
        }

        emit RemainingFundsWithdrawn(msg.sender, userWithdrawableAmount);
    }

    // Getters //
    function getProposal(uint256 _proposalId) public view returns (string memory, uint256, uint256, address) {
        Proposal memory proposal = s_proposals[_proposalId];
        return (proposal.metadata, proposal.minimumAmount, proposal.maximumAmount, proposal.recipient);
    }

    function getProposalIdsByProposer(address _proposer) public view returns (uint256[] memory) {
        return s_proposerToProposalIds[_proposer];
    }

    function getTotalProposals() public view returns (uint256) {
        return s_proposalIdCounter;
    }

    function getMinRequestableAmount() public view returns (uint256) {
        return s_minRequestableAmount;
    }

    function getMaxRequestableAmount() public view returns (uint256) {
        return s_maxRequestableAmount;
    }

    function getTallyDate() public view returns (uint256) {
        return i_tallyDate;
    }

    function getFundingToken() public view returns (address) {
        return address(i_fundingToken);
    }

    function getVotingToken() public view returns (address) {
        return address(i_votingToken);
    }

    function getVotingPowerToken() public view returns (address) {
        return address(i_votingPowerToken);
    }

    function getTotalVotingPowerTokensMinted() public view returns (uint256) {
        return i_votingPowerToken.totalSupply();
    }

    function getTotalVotingPowerTokensUsed() public view returns (uint256) {
        return i_votingPowerToken.balanceOf(address(this));
    }

    function getTotalBalanceAvailbleForDistribution() public view returns (uint256) {
        return s_totalBalanceAvailableForDistribution;
    }

    function getTotalFundsDistributed() public view returns (uint256) {
        return s_totalFundsDistributed;
    }

    function getVotingPowerOf(address _voter) public view returns (uint256) {
        return s_voterToVotingTokens[_voter];
    }

    function getDeployer() public view returns (address) {
        return address(i_deployer);
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.20;

/**
 * Layout of the contract
 * version
 * imports
 * errors
 * interfaces, libraries, and contracts
 * type declarations
 * state variables
 * events
 * modifiers
 * functions
 *
 * layout of functions
 * constructor
 * receive function
 * fallback function
 * external functions
 * public functions
 * internal functions
 * private functions
 * view functions
 * pure functions
 * getters
 */
import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";

contract VotingPowerToken is ERC20, Ownable {
    constructor(string memory _name, string memory _symbol) ERC20(_name, _symbol) Ownable(msg.sender) {}

    function mint(address _to, uint256 _amount) external onlyOwner {
        _mint(_to, _amount);
    }

    function burn(address _of, uint256 _amount) external onlyOwner {
        _burn(_of, _amount);
    }

    function transferFrom(address from, address to, uint256 value) public override returns (bool) {
        if (msg.sender != owner()) {
            super.transferFrom(from, to, value);
        }
        _transfer(from, to, value);
        return true;
    }
}

// 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);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/Math.sol)

pragma solidity ^0.8.20;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Muldiv operation overflow.
     */
    error MathOverflowedMulDiv();

    enum Rounding {
        Floor, // Toward negative infinity
        Ceil, // Toward positive infinity
        Trunc, // Toward zero
        Expand // Away from zero
    }

    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds towards infinity instead
     * of rounding towards zero.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        if (b == 0) {
            // Guarantee the same behavior as in a regular Solidity division.
            return a / b;
        }

        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or
     * denominator == 0.
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) with further edits by
     * Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0 = x * y; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            if (denominator <= prod1) {
                revert MathOverflowedMulDiv();
            }

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator.
            // Always >= 1. See https://cs.stackexchange.com/q/138556/92363.

            uint256 twos = denominator & (0 - denominator);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also
            // works in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (unsignedRoundsUp(rounding) && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded
     * towards zero.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (unsignedRoundsUp(rounding) && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2 of a positive value rounded towards zero.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (unsignedRoundsUp(rounding) && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10 of a positive value rounded towards zero.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (unsignedRoundsUp(rounding) && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256 of a positive value rounded towards zero.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (unsignedRoundsUp(rounding) && 1 << (result << 3) < value ? 1 : 0);
        }
    }

    /**
     * @dev Returns whether a provided rounding mode is considered rounding up for unsigned integers.
     */
    function unsignedRoundsUp(Rounding rounding) internal pure returns (bool) {
        return uint8(rounding) % 2 == 1;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.20;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (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 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC20Metadata} from "./extensions/IERC20Metadata.sol";
import {Context} from "../../utils/Context.sol";
import {IERC20Errors} from "../../interfaces/draft-IERC6093.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 */
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
    mapping(address account => uint256) private _balances;

    mapping(address account => mapping(address spender => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `value`.
     */
    function transfer(address to, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, value);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `value` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, value);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `value`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `value`.
     */
    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, value);
        _transfer(from, to, value);
        return true;
    }

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _transfer(address from, address to, uint256 value) internal {
        if (from == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        if (to == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(from, to, value);
    }

    /**
     * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
     * (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
     * this function.
     *
     * Emits a {Transfer} event.
     */
    function _update(address from, address to, uint256 value) internal virtual {
        if (from == address(0)) {
            // Overflow check required: The rest of the code assumes that totalSupply never overflows
            _totalSupply += value;
        } else {
            uint256 fromBalance = _balances[from];
            if (fromBalance < value) {
                revert ERC20InsufficientBalance(from, fromBalance, value);
            }
            unchecked {
                // Overflow not possible: value <= fromBalance <= totalSupply.
                _balances[from] = fromBalance - value;
            }
        }

        if (to == address(0)) {
            unchecked {
                // Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
                _totalSupply -= value;
            }
        } else {
            unchecked {
                // Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
                _balances[to] += value;
            }
        }

        emit Transfer(from, to, value);
    }

    /**
     * @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
     * Relies on the `_update` mechanism
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _mint(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(address(0), account, value);
    }

    /**
     * @dev Destroys a `value` amount of tokens from `account`, lowering the total supply.
     * Relies on the `_update` mechanism.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead
     */
    function _burn(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        _update(account, address(0), value);
    }

    /**
     * @dev Sets `value` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     *
     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _approve(owner, spender, value, true);
    }

    /**
     * @dev Variant of {_approve} with an optional flag to enable or disable the {Approval} event.
     *
     * By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
     * `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
     * `Approval` event during `transferFrom` operations.
     *
     * Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
     * true using the following override:
     * ```
     * function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
     *     super._approve(owner, spender, value, true);
     * }
     * ```
     *
     * Requirements are the same as {_approve}.
     */
    function _approve(address owner, address spender, uint256 value, bool emitEvent) internal virtual {
        if (owner == address(0)) {
            revert ERC20InvalidApprover(address(0));
        }
        if (spender == address(0)) {
            revert ERC20InvalidSpender(address(0));
        }
        _allowances[owner][spender] = value;
        if (emitEvent) {
            emit Approval(owner, spender, value);
        }
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `value`.
     *
     * Does not update the allowance value in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Does not emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(spender, currentAllowance, value);
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }
}

// 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;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;

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

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC6093.sol)
pragma solidity ^0.8.20;

/**
 * @dev Standard ERC20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

/**
 * @dev Standard ERC721 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.
     * Used in balance queries.
     * @param owner Address of the current owner of a token.
     */
    error ERC721InvalidOwner(address owner);

    /**
     * @dev Indicates a `tokenId` whose `owner` is the zero address.
     * @param tokenId Identifier number of a token.
     */
    error ERC721NonexistentToken(uint256 tokenId);

    /**
     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param tokenId Identifier number of a token.
     * @param owner Address of the current owner of a token.
     */
    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC721InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC721InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param tokenId Identifier number of a token.
     */
    error ERC721InsufficientApproval(address operator, uint256 tokenId);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC721InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC721InvalidOperator(address operator);
}

/**
 * @dev Standard ERC1155 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.
 */
interface IERC1155Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     * @param tokenId Identifier number of a token.
     */
    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC1155InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC1155InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param owner Address of the current owner of a token.
     */
    error ERC1155MissingApprovalForAll(address operator, address owner);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC1155InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC1155InvalidOperator(address operator);

    /**
     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
     * Used in batch transfers.
     * @param idsLength Length of the array of token identifiers
     * @param valuesLength Length of the array of token amounts
     */
    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}

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  "optimizer": {
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0000000000000000000000000000000000000000000000000000000000000005

-----Decoded View---------------
Arg [0] : _platformFee (uint256): 5

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000005