pragma solidity 0.5.6;




// ERC20 declare
contract IERC20 {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  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 Transfer(address indexed from, address indexed to, uint256 value);
  event Approval(address indexed owner, address indexed spender, uint256 value);
  event Burn(address indexed burner, uint256 value);
}




// Ownable
contract Ownable {
  address public owner;
  address public 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 == owner || msg.sender == admin));
    _;
  }


  function transferOwnership(address newOwner) onlyOwner public {
    require(newOwner != address(0));
    require(newOwner != owner);
    require(newOwner != admin);

    emit OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

  function setAdmin(address newAdmin) onlyOwner public {
    require(admin != newAdmin);
    require(owner != newAdmin);

    admin = newAdmin;
  }
}




// ERC20 functions
contract ERC20 is IERC20, Ownable {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;
    mapping(address => bool) internal locks;
    mapping (address => mapping (address => uint256)) private _allowed;
    
    uint256 public Max_supply = 10000000000 * (10 ** 18);
    uint256 private _totalSupply;

    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }


    function balanceOf(address owner) public view returns (uint256) {
        return _balances[owner];
    }


    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowed[owner][spender];
    }


    function transfer(address to, uint256 value) public returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }
    
    function _transfer(address from, address to, uint256 value) internal {
        require(to != address(0));
        require(locks[msg.sender] == false);
        _balances[from] = _balances[from].sub(value);
        _balances[to] = _balances[to].add(value);
        emit Transfer(from, to, value);
    }
    

    function approve(address spender, uint256 value) public returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }
    
    function _approve(address owner, address spender, uint256 value) internal {
        require(spender != address(0));
        require(owner != address(0));

        _allowed[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function transferFrom(address from, address to, uint256 value) public returns (bool) {
        _transfer(from, to, value);
        _approve(from, msg.sender, _allowed[from][msg.sender].sub(value));
        return true;
    }


    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowed[msg.sender][spender].add(addedValue));
        return true;
    }


    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowed[msg.sender][spender].sub(subtractedValue));
        return true;
    }


    function _mint(address account, uint256 value) internal {
        require(account != address(0));
        require(Max_supply >= _totalSupply.add(value));
        _totalSupply = _totalSupply.add(value);
        _balances[account] = _balances[account].add(value);
        emit Transfer(address(0), account, value);
    }
    
    
    function burn(address from, uint256 value) public onlyOwner {
        _burn(from, value);
    }
    

    function _burn(address account, uint256 value) internal {
        require(account != address(0));
        
        _totalSupply = _totalSupply.sub(value);
        _balances[account] = _balances[account].sub(value);
        emit Transfer(account, address(0), value);
    }
    

    function lock(address _owner) public onlyOwner returns (bool) {
        require(locks[_owner] == false);
        locks[_owner] = true;
        return true;
    }

    function unlock(address _owner) public onlyOwner returns (bool) {
        require(locks[_owner] == true);
        locks[_owner] = false;
        return true;
    }

    function showLockState(address _owner) public view returns (bool) {
        return locks[_owner];
    }

}


// Pause, Mint base
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];
    }
}



// ERC20Detailed
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }
    
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}




// Math
library Math {

    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }


    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }


    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}




// SafeMath
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) {
    // 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); // overflow check
    return c;
  }
}




// Pause part
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);
    }
}





contract Pausable is PauserRole {
    event Paused(address account);
    event Unpaused(address account);

    bool private _paused;

    constructor () internal {
        _paused = false;
    }

    function paused() public view returns (bool) {
        return _paused;
    }


    modifier whenNotPaused() {
        require(!_paused);
        _;
    }


    modifier whenPaused() {
        require(_paused);
        _;
    }


    function pause() public onlyPauser whenNotPaused {
        _paused = true;
        emit Paused(msg.sender);
    }


    function unpause() public onlyPauser whenPaused {
        _paused = false;
        emit Unpaused(msg.sender);
    }
}




contract ERC20Pausable is ERC20, Pausable {
    function transfer(address to, uint256 value) public whenNotPaused returns (bool) {
        return super.transfer(to, value);
    }

    function transferFrom(address from, address to, uint256 value) public whenNotPaused returns (bool) {
        return super.transferFrom(from, to, value);
    }

    function approve(address spender, uint256 value) public whenNotPaused returns (bool) {
        return super.approve(spender, value);
    }

    function increaseAllowance(address spender, uint addedValue) public whenNotPaused returns (bool) {
        return super.increaseAllowance(spender, addedValue);
    }

    function decreaseAllowance(address spender, uint subtractedValue) public whenNotPaused returns (bool) {
        return super.decreaseAllowance(spender, subtractedValue);
    }
}




// Mintable part
contract MinterRole {
    using Roles for Roles.Role;

    event MinterAdded(address indexed account);
    event MinterRemoved(address indexed account);

    Roles.Role private _minters;

    constructor () internal {
        _addMinter(msg.sender);
    }

    modifier onlyMinter() {
        require(isMinter(msg.sender));
        _;
    }

    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }

    function addMinter(address account) public onlyMinter {
        _addMinter(account);
    }

    function renounceMinter() public {
        _removeMinter(msg.sender);
    }

    function _addMinter(address account) internal {
        _minters.add(account);
        emit MinterAdded(account);
    }

    function _removeMinter(address account) internal {
        _minters.remove(account);
        emit MinterRemoved(account);
    }
}




contract ERC20Mintable is ERC20, MinterRole {
    function mint(address to, uint256 value) public onlyMinter returns (bool) {
        _mint(to, value);
        return true;
    }
}



// Token detailed
contract DAFIN is ERC20, ERC20Detailed, ERC20Pausable, ERC20Mintable {
    
    string public constant name = "DAFIN";
    string public constant symbol = "DAF";
    
    uint8 public constant DECIMALS = 18;
    uint256 public constant INITIAL_SUPPLY = 300000000 * (10 ** uint256(DECIMALS));

    constructor () public ERC20Detailed(name, symbol, DECIMALS) {
        _mint(msg.sender, INITIAL_SUPPLY);
    }
  
}