// File: /contracts/vesting/NexifyInvestorsVesting.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

contract NexifyInvestorsVesting {

    uint256 constant private PRESEED_MAX = 100000000 * 10 ** 18;
    uint256 constant private PRIVATE_ROUND_1_MAX = 50000000 * 10 ** 18;
    uint256 constant private PRIVATE_ROUND_2_MAX = 100000000 * 10 ** 18;

    address immutable private nexifyToken;
    address private owner;

    uint256 private listingDate;

    mapping(address => uint256) preSeedAmounts;
    mapping(address => uint256) privateRound1Amounts;
    mapping(address => uint256) privateRound2Amounts;

    mapping(address => uint256) preSeedWithdrawnAmounts;
    mapping(address => uint256) privateRound1WithdrawnAmounts;
    mapping(address => uint256) privateRound2WithdrawnAmounts;

    event onWithdrawPreSeedTokens(address _investor, uint256 _amount);
    event onWithdrawPrivateRound1Tokens(address _investor, uint256 _amount);
    event onWithdrawPrivateRound2Tokens(address _investor, uint256 _amount);
    event onEmergencyWidthdraw(address _account, uint256 _amount);

    constructor(address _nexifyToken) {
        nexifyToken = _nexifyToken;
        owner = msg.sender;
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "OnlyOwner");
        _;
    }

    modifier onlyPreeSeedWallet() {
        require(preSeedAmounts[msg.sender] > 0 || msg.sender == owner, "OnlyPreeSeed");
        _;
    }

    function setListingDate(uint256 _listingDate) external onlyOwner {
        listingDate = _listingDate;
    }

    function setPreSeedInvestments(address[] memory _wallets, uint256[] memory _amounts) external onlyOwner {
        require(_wallets.length == _amounts.length, "BadLength");

        uint256 amount = 0;
        for (uint256 i=0; i<_wallets.length; i++) {
            preSeedAmounts[_wallets[i]] = _amounts[i];
            amount += _amounts[i];
        }

        require(amount <= PRESEED_MAX, "PreSeedMaxLimit");
    }

    function setPrivateRound1Investments(address[] memory _wallets, uint256[] memory _amounts) external onlyOwner {
        require(_wallets.length == _amounts.length, "BadLength");

        uint256 amount = 0;
        for (uint256 i=0; i<_wallets.length; i++) {
            privateRound1Amounts[_wallets[i]] = _amounts[i];
            amount += _amounts[i];
        }

        require(amount <= PRIVATE_ROUND_1_MAX, "PreSeedMaxLimit");
    }

    function setPrivateRound2Investments(address[] memory _wallets, uint256[] memory _amounts) external onlyOwner {
        require(_wallets.length == _amounts.length, "BadLength");

        uint256 amount = 0;
        for (uint256 i=0; i<_wallets.length; i++) {
            privateRound2Amounts[_wallets[i]] = _amounts[i];
            amount += _amounts[i];
        }

        require(amount <= PRIVATE_ROUND_2_MAX, "PreSeedMaxLimit");
    }

    function withdrawPreSeedWallets(address _account) external onlyPreeSeedWallet {
        require(block.timestamp > listingDate + 360 days, "TokensVested");
        require(preSeedWithdrawnAmounts[_account] < preSeedAmounts[_account], "MaxBalance");

        uint256 timeDiff = block.timestamp - (listingDate + 360 days);
        uint256 month = (timeDiff / 30 days) + 1;
        uint256 totalAmount = preSeedAmounts[_account];
        uint256 monthTranche = totalAmount / 12;
        uint256 tranchesWithdrawed = preSeedWithdrawnAmounts[_account] / monthTranche;

        require(month > tranchesWithdrawed, "MaxForThisMonth");
        uint256 numTranches = month - tranchesWithdrawed;
        uint256 availableAmount = monthTranche * numTranches;

        if (preSeedWithdrawnAmounts[_account] + availableAmount > preSeedAmounts[_account])
            availableAmount = preSeedAmounts[_account] - preSeedWithdrawnAmounts[_account];

        preSeedWithdrawnAmounts[_account] += availableAmount;
        IERC20(nexifyToken).transfer(_account, availableAmount);

        emit onWithdrawPreSeedTokens(_account, availableAmount);
    }

    function withdrawPrivateRound1Wallets(address _account) external onlyPreeSeedWallet {
        require(block.timestamp > listingDate + 300 days, "TokensVested");
        require(privateRound1WithdrawnAmounts[_account] < privateRound1Amounts[_account], "MaxBalance");

        uint256 timeDiff = block.timestamp - (listingDate + 300 days);
        uint256 month = (timeDiff / 30 days) + 1;
        uint256 totalAmount = privateRound1Amounts[_account];
        uint256 monthTranche = totalAmount / 12;
        uint256 tranchesWithdrawed = privateRound1WithdrawnAmounts[_account] / monthTranche;

        require(month > tranchesWithdrawed, "MaxForThisMonth");
        uint256 numTranches = month - tranchesWithdrawed;
        uint256 availableAmount = monthTranche * numTranches;

        if (privateRound1WithdrawnAmounts[_account] + availableAmount > privateRound1Amounts[_account])
            availableAmount = privateRound1Amounts[_account] - privateRound1WithdrawnAmounts[_account];

        privateRound1WithdrawnAmounts[_account] += availableAmount;
        IERC20(nexifyToken).transfer(_account, availableAmount);

        emit onWithdrawPrivateRound1Tokens(_account, availableAmount);
    }

    function withdrawPrivateRound2Wallets(address _account) external onlyPreeSeedWallet {
        require(block.timestamp > listingDate + 240 days, "TokensVested");
        require(privateRound1WithdrawnAmounts[_account] < privateRound1Amounts[_account], "MaxBalance");

        uint256 timeDiff = block.timestamp - (listingDate + 240 days);
        uint256 month = (timeDiff / 30 days) + 1;
        uint256 totalAmount = privateRound2Amounts[_account];
        uint256 monthTranche = totalAmount / 12;
        uint256 tranchesWithdrawed = privateRound2WithdrawnAmounts[_account] / monthTranche;

        require(month > tranchesWithdrawed, "MaxForThisMonth");
        uint256 numTranches = month - tranchesWithdrawed;
        uint256 availableAmount = monthTranche * numTranches;

        if (privateRound2WithdrawnAmounts[_account] + availableAmount > privateRound2Amounts[_account])
            availableAmount = privateRound2Amounts[_account] - privateRound2WithdrawnAmounts[_account];

        privateRound2WithdrawnAmounts[_account] += availableAmount;
        IERC20(nexifyToken).transfer(_account, availableAmount);

        emit onWithdrawPrivateRound2Tokens(_account, availableAmount);
    }

    function emergencyWidthdraw(address _account, uint256 _amount) external onlyOwner {
        IERC20(nexifyToken).transfer(_account, _amount);

        emit onEmergencyWidthdraw(_account, _amount);
    }

    function transferOwnership(address _newOwner) external onlyOwner {
        require(_newOwner != address(0), "NoEmpty");
        
        owner = _newOwner;
    }
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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 amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` 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 amount) 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 `amount` 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 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` 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 amount
    ) external returns (bool);
}