contract BTSE is Initializable, ContextUpgradeSafe, AccessControlUpgradeSafe, ERC20BurnableUpgradeSafe, ERC20PausableUpgradeSafe {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
    bytes32 public constant BURNER_ROLE = keccak256("BURNER_ROLE");


    function initialize(string memory name, string memory symbol, address admin) public {
        __BTSE_init(name, symbol, admin);
    }

    function __BTSE_init(string memory name, string memory symbol, address admin) internal initializer {
        __Context_init_unchained();
        __AccessControl_init_unchained();
        __ERC20_init_unchained(name, symbol);
        __ERC20Burnable_init_unchained();
        __Pausable_init_unchained();
        __ERC20Pausable_init_unchained();
        __BTSE_init_unchained(name, symbol, admin);
    }

    function __BTSE_init_unchained(string memory name, string memory symbol, address admin) internal initializer {

        _setupRole(DEFAULT_ADMIN_ROLE, admin);
        _setupRole(MINTER_ROLE, admin);
        _setupRole(BURNER_ROLE, admin);
        _setupRole(PAUSER_ROLE, admin);

        _setupDecimals(8);
    }

    /**
    * @dev Destroys `amount` tokens for `from`.
    *
    * See {ERC20-_burn}.
    *
    * Requirements:
    *
    * - the caller must have the `BURNER_ROLE`.
    */
    function burn(address from, uint256 amount) public {
        require(hasRole(BURNER_ROLE, msg.sender), "BTSE: must have burner role to burn"); // _msgSender() ?
        _burn(from, amount);
    }

    /**
     * @dev Creates `amount` new tokens for `to`.
     *
     * See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the `MINTER_ROLE`.
     */
    function mint(address to, uint256 amount) public {
        require(hasRole(MINTER_ROLE, msg.sender), "BTSE: must have minter role to mint");
        _mint(to, amount);
    }

    /**
     * @dev Pauses all token transfers.
     *
     * See {ERC20Pausable} and {Pausable-_pause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function pause() public {
        require(hasRole(PAUSER_ROLE, msg.sender), "BTSE: must have pauser role to pause");
        _pause();
    }

    /**
     * @dev Unpauses all token transfers.
     *
     * See {ERC20Pausable} and {Pausable-_unpause}.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function unpause() public {
        require(hasRole(PAUSER_ROLE, msg.sender), "BTSE: must have pauser role to unpause");
        _unpause();
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal override(ERC20UpgradeSafe, ERC20PausableUpgradeSafe) {
        super._beforeTokenTransfer(from, to, amount);
    }
}
function pause() public {
        require(hasRole(PAUSER_ROLE, msg.sender), "BTSE: must have pauser role to pause");
        _pause();
    }
/**
 * @dev Pauses all token transfers.
 *
 * See {ERC20Pausable} and {Pausable-_pause}.
 *
 * Requirements:
 *
 * - the caller must have the `PAUSER_ROLE`.
 */