// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes memory) {
        this; 
        return msg.data;
    }
    
}
pragma solidity ^0.6.0;
interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}
pragma solidity ^0.6.0;
library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "add of");
        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "sub of");
    }
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "mult of");

        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "div by 0");
    }
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;

        return c;
    }
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "mod by 0");
    }
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}
pragma solidity ^0.6.2;
library Address {
    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Unable to send value, recipient may have reverted");
    }
}
pragma solidity ^0.6.0;
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    uint256 private _totalSupply;
    string private _name = "SirotToken";
    string private _symbol = "SIROT";
    uint8 private _decimals = 18;
    constructor () public {
    }
    function name() public view returns (string memory) {
        return _name;
    }
    function symbol() public view returns (string memory) {
        return _symbol;
    }
    function decimals() public view returns (uint8) {
        return _decimals;
    }
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "transfer from zero address");
        require(recipient != address(0), "transfer to zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "transfer amount exceeds bal");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "mint to  zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "burn from  zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "burn exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "approve from  zero address");
        require(spender != address(0), "approve to  zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
pragma solidity ^0.6.0;
abstract contract ERC20Capped is ERC20 {
    uint256 private _cap;
    constructor () public {
        uint256 cap = 1500000000000000000000000000;
        _cap = cap;
    }
    function cap() public view returns (uint256) {
        return _cap;
    }
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override {
        super._beforeTokenTransfer(from, to, amount);

        if (from == address(0)) { // When minting tokens
            require(totalSupply().add(amount) <= _cap, "cap exceeded");
        }
    }
}
pragma solidity ^0.6.0;
abstract contract ERC20Burnable is Context, ERC20 {
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

}
pragma solidity ^0.6.0;
contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }
    function owner() public view returns (address) {
        return _owner;
    }
    modifier onlyOwner() {
        require(_owner == _msgSender(), "caller not owner");
        _;
    }
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "new owner is zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}
pragma solidity ^0.6.0;
contract TokenRecover is Ownable {
    function recoverERC20(address tokenAddress, uint256 tokenAmount) public onlyOwner {
        IERC20(tokenAddress).transfer(owner(), tokenAmount);
    }
}
pragma solidity ^0.6.0;
library EnumerableSet {
    struct Set {
        bytes32[] _values;
        mapping (bytes32 => uint256) _indexes;
    }
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        uint256 valueIndex = set._indexes[value];
        if (valueIndex != 0) { 
            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;
            bytes32 lastvalue = set._values[lastIndex];
            set._values[toDeleteIndex] = lastvalue;
            set._indexes[lastvalue] = toDeleteIndex + 1;
            set._values.pop();
            delete set._indexes[value];
            return true;
        } else {
            return false;
        }
    }
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "index out of bounds");
        return set._values[index];
    }
    struct AddressSet {
        Set _inner;
    }
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(value)));
    }
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(value)));
    }
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(value)));
    }
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint256(_at(set._inner, index)));
    }
    struct UintSet {
        Set _inner;
    }
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}
pragma solidity ^0.6.0;
abstract contract AccessControl is Context {
    using EnumerableSet for EnumerableSet.AddressSet;
    using Address for address;
    struct RoleData {
        EnumerableSet.AddressSet members;
        bytes32 adminRole;
    }
    mapping (bytes32 => RoleData) private _roles;
    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
    function hasRole(bytes32 role, address account) public view returns (bool) {
        return _roles[role].members.contains(account);
    }
    function getRoleMemberCount(bytes32 role) public view returns (uint256) {
        return _roles[role].members.length();
    }
    function getRoleMember(bytes32 role, uint256 index) public view returns (address) {
        return _roles[role].members.at(index);
    }
    function getRoleAdmin(bytes32 role) public view returns (bytes32) {
        return _roles[role].adminRole;
    }
    function grantRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "sender must be admin to grant");
        _grantRole(role, account);
    }
    function revokeRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "sender must be admin to revoke");
        _revokeRole(role, account);
    }
    function renounceRole(bytes32 role, address account) public virtual {
        require(account == _msgSender(), "can only renounce roles for self");
        _revokeRole(role, account);
    }
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
        _roles[role].adminRole = adminRole;
    }
    function _grantRole(bytes32 role, address account) private {
        if (_roles[role].members.add(account)) {
            emit RoleGranted(role, account, _msgSender());
        }
    }
    function _revokeRole(bytes32 role, address account) private {
        if (_roles[role].members.remove(account)) {
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}
pragma solidity ^0.6.0;
contract Roles is AccessControl {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER");
    bytes32 public constant OPERATOR_ROLE = keccak256("OPERATOR");
    constructor () public {
        _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());
        _setupRole(MINTER_ROLE, _msgSender());
        _setupRole(OPERATOR_ROLE, _msgSender());
    }
    modifier onlyMinter() {
        require(hasRole(MINTER_ROLE, _msgSender()), "caller not MINTER role");
        _;
    }
    modifier onlyOperator() {
        require(hasRole(OPERATOR_ROLE, _msgSender()), "caller not OPERATOR role");
        _;
    }
}
pragma solidity ^0.6.0;
contract SirotToken is ERC20Capped, ERC20Burnable, Roles, TokenRecover {
    bool private _mintingFinished = false;
    bool private _transferEnabled = false;
    event MintFinished();
    event TransferEnabled();
    modifier canMint() {
        require(!_mintingFinished, "Minting is finished");
        _;
    }
    modifier canTransfer(address from) {
        require(
            _transferEnabled || hasRole(OPERATOR_ROLE, from),
            "Disallowed"
        );
        _;
    }
    constructor()
        public
        ERC20Capped()
        ERC20()
    {
        uint8 decimals = 18;
        uint256 initialSupply = 1000000000000000000000000000;
        bool transferEnabled = true;
        bool mintingFinished = false;
        _setupDecimals(decimals);
        if (initialSupply > 0) {
            _mint(owner(), initialSupply);
        }
        if (mintingFinished) {
            finishMinting();
        }
        if (transferEnabled) {
            enableTransfer();
        }
    }
    function mintingFinished() public view returns (bool) {
        return _mintingFinished;
    }
    function transferEnabled() public view returns (bool) {
        return _transferEnabled;
    }
    function mint(address to, uint256 value) public canMint onlyMinter {
        _mint(to, value);
    }
    function transfer(address to, uint256 value) public virtual override(ERC20) canTransfer(_msgSender()) returns (bool) {
        return super.transfer(to, value);
    }
    function finishMinting() public canMint onlyOwner {
        _mintingFinished = true;
        emit MintFinished();
    }
    function enableTransfer() public onlyOwner {
        _transferEnabled = true;
        emit TransferEnabled();
    }
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override(ERC20, ERC20Capped) {
        super._beforeTokenTransfer(from, to, amount);
    }
}