pragma solidity ^0.7.2;

/**
* @dev Provides data about the current execution setting, including the 
* sender of the exchange and its information. While these are commonly accessible 
* through msg.sender and msg.data, they ought not be gotten to in such a direct 
* way, since when managing GSN meta-exchanges the record sending and 
* paying for execution may not be the real sender (to the extent an application 
* is concerned). 
* 
* This agreement is just needed for middle, library-like agreements.
*/
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 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) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        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) {
        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 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) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

}

/** 
* @dev Contract module which gives a fundamental access control system, where 
* there is a record (a proprietor) that can be conceded selective admittance to 
* explicit capacities. 
* 
* By default, the proprietor record will be the one that conveys the agreement. This 
* can later be changed with {transferOwnership}. 
* 
* This module is utilized through legacy. It will make accessible the modifier 
* 'onlyOwner', which can be applied to your capacities to confine their utilization to 
* the proprietor. 
*/
contract Owned {
    address public owner;
    address public newOwner;

    event OwnershipTransferred(address indexed from, address indexed _to);

    constructor(address _owner) public {
        owner = _owner;
    }

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

    function transferOwnership(address _newOwner) external onlyOwner {
        newOwner = _newOwner;
    }
    function acceptOwnership() external {
        require(msg.sender == newOwner);
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
        newOwner = address(0);
    }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);
    
    /**
     * @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);
}


abstract contract ERC20 is IERC20, Owned {
    using SafeMath for uint256;

    mapping (address => uint256) internal _balances;

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

    uint256 internal _totalSupply;
    
    function totalSupply() public override view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public override view returns (uint256) {
        return _balances[account];
    }

    function allowance(address owner, address spender) public override view returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 value) public override returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount);
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    function _burn(address account, uint256 value) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _totalSupply = _totalSupply.sub(value);
        _balances[account] = _balances[account].sub(value);
        emit Transfer(account, address(0), value);
    }

    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
        return true;
    }

    function _approve(address owner, address spender, uint256 value) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = value;
        emit Approval(owner, spender, value);
    }
    
}

abstract contract StakeVXP {
     /**
     * @dev stakes amount of tokens to the liquidity provider pool
     */
  function _stake(address to, uint256 amount) internal{}

 /**
     * @dev redeems the amount of the current user
     */
  function _redeem(address to, uint256 amount) internal{}

 /**
     * @dev claims rewards transfer to his account.
     */
  function _claimRewards(address to, uint256 amount) internal{}
}

 /**
     * @dev VAULTXP Contract is completely unique and adheres to the traditional
     * allowance mechanism. The contract is made by 2 devs ken and XP
     */
contract VaultXP is ERC20, StakeVXP {


    using SafeMath for uint256;

    string  public name;
    string  public symbol;
    uint8   public decimals;
    uint256 public burnedToken;
    uint256 public presaleToken;
    
    uint256 public presaleTarget;
    uint256 public presalePool;
    bool public presaleEvent;
    
    address private stakeContractAddress;
    
    
    constructor() public Owned(msg.sender) {
        name = "VAULTXP.FINANCE";
        symbol = "VAULTXP";
        decimals = 18;
        
        _totalSupply = 15000000000000000000000; // 15,000 supply
        _balances[msg.sender] = _totalSupply;
        burnedToken = 0;
        presaleToken = 14500;
        presaleTarget = 650000000000000000000; // 650
        emit Transfer(address(0), msg.sender, _totalSupply);
    }
    
    function burn(uint256 _amount) external returns (bool) {
      super._burn(msg.sender, _amount);
      burnedToken = burnedToken.add(_amount);
      return true;
    }

    function transfer(address _recipient, uint256 _amount) public override returns (bool) {
        if(totalSupply() <= 3000) {
            super._transfer(msg.sender, _recipient, _amount);
            return true;
        }
        uint _burnAmount = _amount.mul(100).div(10000); // 1 percent burning
        _burn(msg.sender, _burnAmount);
        burnedToken = burnedToken.add(_burnAmount);
        uint _transferAmount = _amount.sub(_burnAmount);
        super._transfer(msg.sender, _recipient, _transferAmount);
        return true;
    }

    function transferFrom(address _sender, address _recipient, uint256 _amount) public override returns (bool) {
        super._transferFrom(_sender, _recipient, _amount);
        return true;
    }

    function buyPresaleToken() public payable{
        require(presaleEvent);

        transferToPresalePool();

        uint256 value = msg.value;
        require(value > 0);

        uint _tokenEquivalent = value.mul(22);

        _balances[owner] = _balances[owner].sub(_tokenEquivalent);
        _balances[msg.sender] = _balances[msg.sender].add(_tokenEquivalent);
        
        // update Presale Pool Value
        presalePool = presalePool.add(value);
        
    }

    function transferToPresalePool() private{
        address payable _to = address(uint160(owner));
        _to.transfer(getBalance());
    }
    
    function getBalance() private view returns(uint){
        return address(this).balance;
    }
    
    function getContractBalance() public view onlyOwner returns(uint){
        return getBalance();
    }
    
    function startPresaleEvent() public onlyOwner{
        presaleEvent = true;
    }
    
    function endPresaleEvent() public onlyOwner{
        presaleEvent = false;
    }
    
    function getTokenBalance() public view returns(uint){
        return _balances[msg.sender];
    }
    
    function setStakeContractAddress(address _stakeContractAddress) public onlyOwner{
        stakeContractAddress = _stakeContractAddress;
    }
    
    function getStakeContractAddress() public view onlyOwner returns(address){
        return stakeContractAddress;
    }
    
    function stake(address _stakeToContract, address _to, uint256 _amount) public{
        require(_stakeToContract == stakeContractAddress);
        _stake(_to, _amount);
    }
    
    function redeem(address _stakeToContract, address _to, uint256 _amount) public{
        require(_stakeToContract == stakeContractAddress);
        _redeem(_to, _amount);
    }
    
    function _claimRewards(address _stakeToContract, address _to, uint256 _amount) public{
        require(_stakeToContract == stakeContractAddress);
        _claimRewards(_to, _amount);
    }
    
}

{
  "compilationTarget": {
    "browser/VaultXP.sol": "VaultXP"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}