/**
 *Submitted for verification at Etherscan.io on 2020-01-31
*/

/**
 PeterJeon 
*/

pragma solidity 0.4.25;

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 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);
}

contract DetailedERC20 is ERC20 {
	string public name;
	string public symbol;
	uint8 public decimals;
	
	constructor(string _name, string _symbol, uint8 _decimals) public {
		name = _name;
		symbol = _symbol;
		decimals = _decimals;
	}
}

contract BasicToken is ERC20Basic {
	using SafeMath for uint256;
	mapping(address => uint256) balances;
	mapping (address => uint256) freezeOf;
	uint256 _totalSupply;
	function totalSupply() public view returns (uint256) {
		return _totalSupply;
	}

	function transfer(address _to, uint256 _value) public returns (bool) {
		require(_to != address(0) && _value > 0 &&_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 ERC20Token is BasicToken, ERC20 {
	using SafeMath for uint256;
	mapping (address => mapping (address => uint256)) allowed;
	mapping (address => uint256) freezeOf;
	
	function approve(address _spender, uint256 _value) public returns (bool) {
		require(_value == 0 || allowed[msg.sender][_spender] == 0);
		allowed[msg.sender][_spender] = _value;
		emit Approval(msg.sender, _spender, _value);
		
		return true;
	}
	
	function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
		return allowed[_owner][_spender];
	}

	function increaseApproval(address _spender, uint256 _addedValue) public returns (bool success) {
		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, uint256 _subtractedValue) public returns (bool success) {
		uint256 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 Ownable {

	address public owner;
	mapping (address => bool) admin;
	
	event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
	
	constructor() public {
		owner = msg.sender;
	}


	modifier onlyOwner() {
		require(msg.sender == owner);
		_;
	}
	
	modifier onlyOwnerOrAdmin() {
		require(msg.sender != address(0) || msg.sender == owner || admin[msg.sender] == true);
		_;
	}
	
	function transferOwnership(address newOwner) onlyOwner public {
		require(newOwner != address(0) && newOwner != owner && admin[newOwner] == true);
		emit OwnershipTransferred(owner, newOwner);
		owner = newOwner;
	}

	function setAdmin(address newAdmin) onlyOwner public {
		require(admin[newAdmin] != true && owner != newAdmin);
		admin[newAdmin] = true;
	}
	
	function unsetAdmin(address Admin) onlyOwner public {
		require(admin[Admin] != false && owner != Admin);
		admin[Admin] = false;
	}
  
}

contract Pausable is Ownable {
	event Pause();
	event Unpause();

	bool public paused = false;

	modifier whenNotPaused() {
		require(!paused);
		_;
	}

	modifier whenPaused() {
		require(paused);
		_;
	}

	function pause() onlyOwner whenNotPaused public {
		paused = true;
		emit Pause();
	}

	function unpause() onlyOwner whenPaused public {
		paused = false;
		emit Unpause();
	}
	
}


contract PauserRole {
	using Roles for Roles.Role;
	
	event PauserAdded(address indexed account);
	event PauserRemoved(address indexed account);

	Roles.Role private pausers;

	constructor() internal {
		_addPauser(msg.sender);
	}

	modifier onlyPauser() {
		require(isPauser(msg.sender));
		_;
	}

	function isPauser(address account) public view returns (bool) {
		return pausers.has(account);
	}

	function addPauser(address account) public onlyPauser {
		_addPauser(account);
	}

	function renouncePauser() public {
		_removePauser(msg.sender);
	}

	function _addPauser(address account) internal {
		pausers.add(account);
		emit PauserAdded(account);
	}

	function _removePauser(address account) internal {
		pausers.remove(account);
		emit PauserRemoved(account);
	}

}

library SafeMath {
	function mul(uint256 a, uint256 b) internal pure returns (uint256) {
		if (a == 0 || b == 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;
	}
}


library Roles {
	struct Role {
		mapping (address => bool) bearer;
	}

	function add(Role storage role, address account) internal {
		require(account != address(0));
		require(!has(role, account));

		role.bearer[account] = true;
	}

	function remove(Role storage role, address account) internal {
		require(account != address(0));
		require(has(role, account));

		role.bearer[account] = false;
	}

	function has(Role storage role, address account) internal view returns (bool){
		require(account != address(0));
		return role.bearer[account];
	}
	
}

contract BurnableToken is BasicToken, Ownable {
	event Burn(address indexed burner, uint256 amount);

	function burn(uint256 _value) onlyOwner public {
		balances[msg.sender] = balances[msg.sender].sub(_value);
		_totalSupply = _totalSupply.sub(_value);
		emit Burn(msg.sender, _value);
		emit Transfer(msg.sender, address(0), _value);
	}
}



contract GoldBlock is BurnableToken, DetailedERC20, ERC20Token,Pausable{
	using SafeMath for uint256;

	event Approval(address indexed owner, address indexed spender, uint256 value);
	event LockerChanged(address indexed _address, uint256 amount);
	event Recall(address indexed from, uint256 amount);
	
	mapping(address => uint) public locker;
	
	string public constant symbol = "GBK";
 	string public constant name = "GoldBlock";
	uint8 public constant decimals = 18;
	
	uint256 public constant TOTAL_SUPPLY = 100*(10**8)*(10**uint256(decimals));

	constructor() DetailedERC20(name, symbol, decimals) public {
		_totalSupply = TOTAL_SUPPLY;
		balances[owner] = _totalSupply;
		emit Transfer(address(0x0), msg.sender, _totalSupply);
	}

	
	function transfer(address _to, uint256 _value)  public whenNotPaused returns (bool){
		require(balances[msg.sender] - _value >= locker[msg.sender]);
		return super.transfer(_to, _value);
	}

	function transferFrom(address _from, address _to, uint256 _value) public whenNotPaused returns (bool){
		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 lockOf(address _address) public view returns (uint256 _locker) {
		return locker[_address];
	}

	function setLock(address _address, uint256 _value) public onlyOwnerOrAdmin {
		require(_value <= _totalSupply &&_address != address(0));
		locker[_address] = _value;
		emit LockerChanged(_address, _value);
	}

	function recall(address _from, uint256 _amount) public onlyOwnerOrAdmin {
	
		require(_amount > 0);

		uint256 currentLocker = locker[_from];
		uint256 currentBalance = balances[_from];

		require(currentLocker >= _amount && currentBalance >= _amount);

		uint256 newLock = currentLocker - _amount;
		locker[_from] = newLock;
		emit LockerChanged(_from, newLock);

		
		balances[_from] = balances[_from].sub(_amount);
		balances[owner] = balances[owner].add(_amount);
		emit Transfer(_from, owner, _amount);
		emit Recall(_from, _amount);
		
    }
		
	function transferList(address[] _recipients, uint256[] _balances) public onlyOwnerOrAdmin{
		require(_recipients.length == _balances.length);
		
		for (uint i=0; i < _recipients.length; i++) {
		    balances[msg.sender] = balances[msg.sender].sub(_balances[i]);
			balances[_recipients[i]] = balances[_recipients[i]].add(_balances[i]);
    		emit Transfer(msg.sender,_recipients[i],_balances[i]);
		}
	}

	function setLockList(address[] _recipients, uint256[] _balances) public onlyOwnerOrAdmin{
		require(_recipients.length == _balances.length);
		
		for (uint i=0; i < _recipients.length; i++) {
			locker[_recipients[i]] = _balances[i];
		    emit LockerChanged(_recipients[i], _balances[i]);
		}
	}
	
	function() public payable {
		revert();
	}
}