pragma solidity ^0.4.23;

library SafeMath {

    
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }

    
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        
        uint256 c = a / b;
        
        return c;
    }

    
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

contract Ownable {
    address public owner;
    bool public stopped = false;

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


    
    constructor() public{
        owner = msg.sender;
    }

    
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    
    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }

    
    function stop() onlyOwner public{
        stopped = true;
    }

    
    function start() onlyOwner public{
        stopped = false;
    }

    
    modifier isRunning {
        assert (!stopped);
        _;
    }
}

contract ERC20Basic {
    function totalSupply() public view returns (uint256);
    function balanceOf(address who) public view returns (uint256);
    function transfer(address to, uint256 value) public returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
}

contract BasicToken is ERC20Basic {
    using SafeMath for uint256;

    mapping(address => uint256) balances;

    uint256 totalSupply_;

    
    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    
    function transfer(address _to, uint256 _value) public returns (bool) {
        require(_to != address(0));
        require(_value <= balances[msg.sender]);

        
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    
    function balanceOf(address _owner) public view returns (uint256 balance) {
        return balances[_owner];
    }

}

contract BurnableToken is BasicToken, Ownable {

    event Burn(address indexed burner, uint256 value);

    
    function burn(uint256 _value) public onlyOwner{
        require(_value <= balances[msg.sender]);
        
        

        address burner = msg.sender;
        balances[burner] = balances[burner].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);
        emit Burn(burner, _value);
    }
}

contract ERC20 is ERC20Basic {
    function allowance(address owner, address spender) public view returns (uint256);
    function transferFrom(address from, address to, uint256 value) public returns (bool);
    function approve(address spender, uint256 value) public returns (bool);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

library SafeERC20 {
    function safeTransfer(ERC20Basic token, address to, uint256 value) internal {
        assert(token.transfer(to, value));
    }

    function safeTransferFrom(ERC20 token, address from, address to, uint256 value) internal {
        assert(token.transferFrom(from, to, value));
    }

    function safeApprove(ERC20 token, address spender, uint256 value) internal {
        assert(token.approve(spender, value));
    }
}

contract StandardToken is ERC20, BasicToken {

    mapping (address => mapping (address => uint256)) internal allowed;

    
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
        require(_to != address(0));
        require(_value <= balances[_from]);
        require(_value <= allowed[_from][msg.sender]);

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        emit Transfer(_from, _to, _value);
        return true;
    }

    
    function approve(address _spender, uint256 _value) public returns (bool) {
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    
    function allowance(address _owner, address _spender) public view returns (uint256) {
        return allowed[_owner][_spender];
    }

    
    function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
        allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    
    function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
        uint oldValue = allowed[msg.sender][_spender];
        if (_subtractedValue > oldValue) {
            allowed[msg.sender][_spender] = 0;
        } else {
            allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
        }
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }
}

contract VGWToken is StandardToken, BurnableToken {

    using SafeMath for uint;    

    string constant public symbol = "VGW";
    string constant public name = "VegaWallet";

    uint8 constant public decimals = 5;    
    uint256 public constant decimalFactor = 10 ** uint256(decimals);
    uint256 public constant INITIAL_SUPPLY = 200000000 * decimalFactor;

    uint constant ITSStartTime = 1537185600;  
    uint constant ITSEndTime = 1542369600;    
    uint constant unlockTimeF1 = 1550125800;  
    uint constant unlockTimeF2 = 1565937000;  

    uint256 constant publicTokens = 120000000 * decimalFactor;
    uint256 constant investorTokens = 20000000 * decimalFactor;
    uint256 constant founderTokens1 = 8750000 * decimalFactor;
    uint256 constant founderTokens2 = 26250000 * decimalFactor;
    uint256 constant devTokens = 25000000 * decimalFactor;

    address constant adrInvestor = 0x23Ce1F8d4926bd6d768815Cc45B1D4Fc7B920efB;
    address constant adrFounder1 = 0xf56E5B449f2966fc3718AD6d44B9e75a94B6852b;
    address constant adrFounder2 = 0x73EE65A92f551D613b77Ab6D72Ee08570cfC8Dc6;
    address constant adrDevTeam = 0x8856D5434602a65933DBbb0636a19953AA5dcCa1;

    constructor(address owner) public {
        totalSupply_ = INITIAL_SUPPLY;
        
        preSale(owner,publicTokens);
        preSale(adrInvestor,investorTokens);
        preSale(adrFounder1,founderTokens1);
        preSale(adrFounder2,founderTokens2);
        preSale(adrDevTeam,devTokens);
    }

    function preSale(address _address, uint _amount) internal returns (bool) {
        balances[_address] = _amount;
        emit Transfer(address(0x0), _address, _amount);
    }

    function checkPermissions(address _address) internal view returns (bool) {

        if( ( _address == adrInvestor || _address == adrDevTeam ) && ( block.timestamp < ITSEndTime ) ){
            return false;
        }else if( ( block.timestamp < unlockTimeF1 ) && ( _address == adrFounder1 ) ){
            return false;
        }else if( ( block.timestamp < unlockTimeF2 ) && ( _address == adrFounder2 ) ){
            return false;
        }else if ( _address == owner ){
            return true;
        }else if( block.timestamp < ITSEndTime ){
            return false;
        }else{
            return true;
        }
    }

    function transfer(address _to, uint256 _value) isRunning public returns (bool) {

        require(checkPermissions(msg.sender));
        super.transfer(_to, _value);
    }

    function transferFrom(address _from, address _to, uint256 _value) isRunning public returns (bool) {

        require(checkPermissions(_from));
        super.transferFrom(_from, _to, _value);
    }

    function () public payable {
        require(msg.value >= 1e16);
        owner.transfer(msg.value);
    }
}