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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import './modules/ERC20Token.sol';

contract MomocoToken is ERC20Token {
    using SafeMath for uint;
    uint public constant MAXSUPPLY = 1e26;
    address public owner;
    address public admin;
    address public team;
    uint public teamRate;
    mapping (address => uint) public funds;
    
    event OwnerChanged(address indexed _user, address indexed _old, address indexed _new);
    event AdminChanged(address indexed _user, address indexed _old, address indexed _new);
    event TeamChanged(address indexed _user, address indexed _old, address indexed _new);
    event TeamRateChanged(address indexed _user, uint indexed _old, uint indexed _new);
    event FundChanged(address indexed _user, uint indexed _old, uint indexed _new);
    event Mint(address indexed from, address indexed to, uint value);
    
    modifier onlyOwner() {
        require(msg.sender == owner, 'forbidden');
        _;
    }

    modifier onlyAdmin() {
        require(msg.sender == admin || msg.sender == owner, "forbidden");
        _;
    }

    modifier onlyTeam() {
        require(msg.sender == team || msg.sender == owner, "forbidden");
        _;
    }

    constructor() {
        decimals = 18;
        name = 'Momoco Token';
        symbol = 'MOMOCO';
        owner = msg.sender;
        admin = msg.sender;
        team = msg.sender;
    }
    
    function changeOwner(address _user) external onlyOwner {
        require(owner != _user, 'no change');
        emit OwnerChanged(msg.sender, owner, _user);
        owner = _user;
    }

    function changeAdmin(address _user) external onlyAdmin {
        require(admin != _user, 'no change');
        emit AdminChanged(msg.sender, admin, _user);
        admin = _user;
    }

    function changeTeam(address _user) external onlyTeam {
        require(team != _user, 'no change');
        emit TeamChanged(msg.sender, team, _user);
        team = _user;
    }

    function changeTeamRate(uint _teamRate) external onlyAdmin {
        require(teamRate != _teamRate, 'no change');
        emit TeamRateChanged(msg.sender, teamRate, _teamRate);
        teamRate = _teamRate;
    }

    function increaseFund (address _user, uint _value) public onlyAdmin {
        require(_value > 0, 'zero');
        uint _old = funds[_user];
        funds[_user] = _old.add(_value);
        emit FundChanged(msg.sender, _old, funds[_user]);
    }

    function decreaseFund (address _user, uint _value) public onlyAdmin {
        uint _old = funds[_user];
        require(_value > 0, 'zero');
        require(_old >= _value, 'insufficient');
        funds[_user] = _old.sub(_value);
        emit FundChanged(msg.sender, _old, funds[_user]);
    }
    
    function increaseFunds (address[] calldata _users, uint[] calldata _values) external onlyAdmin {
        require(_users.length == _values.length, 'invalid parameters');
        for (uint i=0; i<_users.length; i++){
            increaseFund(_users[i], _values[i]);
        }
    }
    
    function decreaseFunds (address[] calldata _users, uint[] calldata _values) external onlyAdmin {
        require(_users.length == _values.length, 'invalid parameters');
        for (uint i=0; i<_users.length; i++){
            decreaseFund(_users[i], _values[i]);
        }
    }

    function _mint(address to, uint value) internal returns (bool) {
        balanceOf[to] = balanceOf[to].add(value);
        totalSupply = totalSupply.add(value);
        require(totalSupply <= MAXSUPPLY, 'over max supply');
        emit Transfer(address(this), to, value);
        emit Mint(msg.sender, to, value);
        return true;
    }

    function mint(address to, uint value) external returns (bool) {
        require(funds[msg.sender] >= value, "fund insufficient");
        funds[msg.sender] = funds[msg.sender].sub(value);
        _mint(to, value);

        if(value > 0 && teamRate > 0 && team != to) {
            uint reward = value.div(teamRate);
            _mint(team, reward);
        }
        return true;
    }

    function burn(uint value) external returns (bool) {
        _transfer(msg.sender, address(0), value);
        return true;
    }

    function take() public view returns (uint) {
        return funds[msg.sender];
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import '../libraries/SafeMath.sol';

contract ERC20Token {
    using SafeMath for uint;

    string public name;
    string public symbol;
    uint8 public decimals;
    uint public totalSupply;
    mapping(address => uint) public balanceOf;
    mapping(address => mapping(address => uint)) public allowance;

    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);

    function _transfer(address from, address to, uint value) internal {
        require(balanceOf[from] >= value, 'ERC20Token: INSUFFICIENT_BALANCE');
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        if (to == address(0)) { // burn
            totalSupply = totalSupply.sub(value);
        }
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint value) external returns (bool) {
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint value) external returns (bool) {
        require(allowance[from][msg.sender] >= value, 'ERC20Token: INSUFFICIENT_ALLOWANCE');
        allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        _transfer(from, to, value);
        return true;
    }

}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "metadata": {
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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