pragma solidity ^0.4.24;

library SafeMath {
    function add(uint a, uint b) internal pure returns (uint c) {
        c = a + b;
        require(c >= a);
    }
    function sub(uint a, uint b) internal pure returns (uint c) {
        require(b <= a);
        c = a - b;
    }
    function mul(uint a, uint b) internal pure returns (uint c) {
        c = a * b;
        require(a == 0 || c / a == b);
    }
    function div(uint a, uint b) internal pure returns (uint c) {
        require(b > 0);
        c = a / b;
    }
}

contract ERC20Interface {
    function totalSupply() public view returns (uint);
    function balanceOf(address tokenOwner) public view returns (uint balance);
    //function allowance(address tokenOwner, address spender) public view returns (uint remaining);
    function transfer(address to, uint tokens) public returns (bool success);
    //function approve(address spender, uint tokens) public returns (bool success);
    function transferFrom(address from, address to, uint tokens) public returns (bool success);

    event Transfer(address indexed from, address indexed to, uint tokens);
    //event Approval(address indexed tokenOwner, address indexed spender, uint tokens);

    event Burn(address indexed from, uint256 value);
}

contract Owned {
    address public owner;
    address public newOwner;
    address public admin;

    event OwnershipTransferred(address indexed _from, address indexed _to);

    constructor() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address _newOwner) public onlyOwner {
        newOwner = _newOwner;
    }
    function acceptOwnership() public onlyOwner {
        require(msg.sender == newOwner);
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
        newOwner = address(0);
    }
}

contract MGS is ERC20Interface, Owned {
    using SafeMath for uint;

    string public symbol;
    string public  name;
    uint8 public decimals;
    uint _totalSupply;
    uint   public  totallockedtime;

    mapping(address => uint) balances;
    mapping(address => mapping(address => uint)) allowed;

    constructor() public {
        symbol = "MGS";
        name = "MGS Token";
        decimals = 18;
        _totalSupply =  5000000000 * 10**uint(decimals);
        admin = owner;
        balances[owner] = _totalSupply;
        totallockedtime = now;
        emit Transfer(address(0), owner, _totalSupply);
    }

    modifier validDestination(address to){
        require(to != address(0x0));
        require(to != address(this));
        _;
    }

    modifier onlyWhenUnlocked(){
      require(getTime() >= totallockedtime);
      _;
    }

    function setTotalLockedTime(uint _value) onlyOwner public{
        totallockedtime = _value;
    }

    function totalSupply() public view returns (uint) {
        return _totalSupply.sub(balances[address(0)]);
    }

    function balanceOf(address tokenOwner) public view returns (uint balance) {
        return balances[tokenOwner];
    }

    function transfer(address to, uint tokens) onlyWhenUnlocked public validDestination(to) returns (bool success) {
        balances[msg.sender] = balances[msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens);
        emit Transfer(msg.sender, to, tokens);
        return true;
    }

    function transferFrom(address from, address to, uint tokens) public returns (bool success) {
        balances[from] = balances[from].sub(tokens);
        allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens);
        emit Transfer(from, to, tokens);
        return true;
    }

    function burn(uint256 _value) public returns (bool success) {
        balances[msg.sender] = balances[msg.sender].sub(_value);
        _totalSupply = _totalSupply.sub(_value);
        emit Burn(msg.sender, _value);
        emit Transfer(msg.sender, address(0x0), _value);
        return true;
    }

    function burnFrom(address _from, uint256 _value) public returns (bool success) {
      require(_from != 0);
      require(_value <= balances[_from]);
      _totalSupply = _totalSupply.sub(_value);
      balances[_from] = balances[_from].sub(_value);
      emit Transfer(_from, address(0), _value);
      return true;
    }

    function getTime() public constant returns (uint) {
        return now;
    }

    function () external payable {
        revert();
    }

}