pragma solidity 0.5.0;
/*
HUBTOKEN Standard ERC20 Tokens
*/
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) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    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;
  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;
  }
}
contract ERC20Basic {
  uint256 public totalSupply;  
  function balanceOf(address _owner) public view returns (uint256 balance);  
  function transfer(address _to, uint256 _amount) public returns (bool success);  
  event Transfer(address indexed from, address indexed to, uint256 value);
}
contract ERC20 is ERC20Basic {
  function allowance(address _owner, address _spender) public view returns (uint256 remaining);  
  function transferFrom(address _from, address _to, uint256 _amount) public returns (bool success);  
  function approve(address _spender, uint256 _amount) public returns (bool success);  
  event Approval(address indexed owner, address indexed spender, uint256 value);
}
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;
  mapping(address => uint256) balances;
  function transfer(address _to, uint256 _amount) public returns (bool success) {
    require(_to != address(0));
    require(balances[msg.sender] >= _amount && _amount > 0 && balances[_to].add(_amount) > balances[_to]);
    balances[msg.sender] = balances[msg.sender].sub(_amount);
    balances[_to] = balances[_to].add(_amount);
    emit Transfer(msg.sender, _to, _amount);
    return true;
  }
  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }
}
contract StandardToken is ERC20, BasicToken {  
  mapping (address => mapping (address => uint256)) internal allowed;
  function transferFrom(address _from, address _to, uint256 _amount) public returns (bool success) {
    require(_to != address(0));
    require(balances[_from] >= _amount);
    require(allowed[_from][msg.sender] >= _amount);
    require(_amount > 0 && balances[_to].add(_amount) > balances[_to]);
    balances[_from] = balances[_from].sub(_amount);
    balances[_to] = balances[_to].add(_amount);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_amount);
    emit Transfer(_from, _to, _amount);
    return true;
  }
  function approve(address _spender, uint256 _amount) public returns (bool success) {
    allowed[msg.sender][_spender] = _amount;
    emit Approval(msg.sender, _spender, _amount);
    return true;
  }
  function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
    return allowed[_owner][_spender];
  }
}
contract BurnableToken is StandardToken, Ownable {
    event Burn(address indexed burner, uint256 value);
	function burn(uint256 _value) public onlyOwner{
        require(_value <= balances[msg.sender]);
		balances[msg.sender] = balances[msg.sender].sub(_value);
        totalSupply = totalSupply.sub(_value);
        emit Burn(msg.sender, _value);
    }
}
contract HUBToken is BurnableToken {
    string public name = "HUB Token";
    string public symbol = "HUB";
    uint256 public totalSupply;
    uint8 public decimals = 18;
	function () external payable  {
        revert();
    }	 
    
	constructor(uint256 initialSupply, string memory tokenName, string memory tokenSymbol) public {
        initialSupply = 1000000000;
        totalSupply = initialSupply.mul( 10 ** uint256(decimals));
        tokenName = "HUB Token";
        tokenSymbol = "HUB";
        balances[msg.sender] = totalSupply;
        emit Transfer(address(0), msg.sender, totalSupply);
    }
    
	function getTokenDetail() public view returns (string memory, string memory, uint256) {
	    return (name, symbol, totalSupply);
    }
 }