// Contract: JTrancheBToken
// Target function: function _updateFundsTokenBalance() internal returns (int256)
 these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20Upgradeable is Initializable, ContextUpgradeable, IERC20Upgradeable {
    using SafeMathUpgradeable for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    function __ERC20_init(string memory name_, string memory symbol_) internal initializer {
        __Context_init_unchained();
        __ERC20_init_unchained(name_, symbol_);
    }

    function __ERC20_init_unchained(string memory name_, string memory symbol_) internal initializer {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    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;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
    uint256[44] private __gap;
}


/** 
 *  SourceUnit: /home/fabio/Jibrel/tranche-compound-protocol/contracts/JTrancheBToken.sol
*/

////// SPDX-License-Identifier-FLATTEN-SUPPRESS-WARNING: MIT
pragma solidity 0.6.12;

////import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
////import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
////import "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";
////import "@openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.sol";
////import "./interfaces/IJTrancheTokens.sol";
////import "./math/SafeMathUint.sol";
////import "./math/SafeMathInt.sol";
////import "./interfaces/IFDTBasic.sol";
////import "./JTrancheBTokenStorage.sol";

contract JTrancheBToken is IFDTBasic, OwnableUpgradeable, ERC20Upgradeable, AccessControlUpgradeable, JTrancheBTokenStorage, IJTrancheTokens {
	using SafeMathUpgradeable for uint256;
	using SafeMathUint for uint256;
	using SafeMathInt for int256;

	function initialize(string memory name, string memory symbol) external initializer() {
		OwnableUpgradeable.__Ownable_init();
        __ERC20_init(name, symbol);
		// Grant the minter role to a specified account
        _setupRole(MINTER_ROLE, msg.sender);
	}

    function setJCompoundMinter(address _jCompound) external onlyOwner {
		// Grant the minter role to a specified account
        _setupRole(MINTER_ROLE, _jCompound);
	}

	function setRewardTokenAddress(address _token) external override onlyOwner {
		//rewardsTokenAddress = _token;
		rewardsToken = IERC20Upgradeable(_token);
	}

	/** 
	 * prev. distributeDividends
	 * @notice Distributes funds to token holders.
	 * @dev It reverts if the total supply of tokens is 0.
	 * It emits the `FundsDistributed` event if the amount of received ether is greater than 0.
	 * About undistributed funds:
	 *   In each distribution, there is a small amount of funds which does not get distributed,
	 *     which is `(msg.value * pointsMultiplier) % totalSupply()`.
	 *   With a well-chosen `pointsMultiplier`, the amount funds that are not getting distributed
	 *     in a distribution can be less than 1 (base unit).
	 *   We can actually keep track of the undistributed ether in a distribution
	 *     and try to distribute it in the next distribution ....... todo implement  
	 */
	function _distributeFunds(uint256 value) internal {
		require(totalSupply() > 0, "JTrancheB: supply is zero");
		if (value > 0) {
			pointsPerShare = pointsPerShare.add(value.mul(pointsMultiplier) / totalSupply());
			emit FundsDistributed(msg.sender, value);
		}
	}

	/**
	 * prev. withdrawDividend
	 * @notice Prepares funds withdrawal
	 * @dev It emits a `FundsWithdrawn` event if the amount of withdrawn ether is greater than 0.
	 */
	function _prepareWithdraw() internal returns (uint256) {
		uint256 _withdrawableDividend = withdrawableFundsOf(msg.sender);
		withdrawnFunds[msg.sender] = withdrawnFunds[msg.sender].add(_withdrawableDividend);
		emit FundsWithdrawn(msg.sender, _withdrawableDividend);
		return _withdrawableDividend;
	}

	/** 
	 * prev. withdrawableDividendOf
	 * @notice View the amount of funds that an address can withdraw.
	 * @param _owner The address of a token holder.
	 * @return The amount funds that `_owner` can withdraw.
	 */
	function withdrawableFundsOf(address _owner) public view override returns(uint256) {
		return accumulativeFundsOf(_owner).sub(withdrawnFunds[_owner]);
	}
	
	/**
	 * prev. withdrawnDividendOf
	 * @notice View the amount of funds that an address has withdrawn.
	 * @param _owner The address of a token holder.
	 * @return The amount of funds that `_owner` has withdrawn.
	 */
	function withdrawnFundsOf(address _owner) public view returns(uint256) {
		return withdrawnFunds[_owner];
	}

	/**
	 * prev. accumulativeDividendOf
	 * @notice View the amount of funds that an address has earned in total.
	 * @dev accumulativeFundsOf(_owner) = withdrawableFundsOf(_owner) + withdrawnFundsOf(_owner)
	 * = (pointsPerShare * balanceOf(_owner) + pointsCorrection[_owner]) / pointsMultiplier
	 * @param _owner The address of a token holder.
	 * @return The amount of funds that `_owner` has earned in total.
	 */
	function accumulativeFundsOf(address _owner) public view returns(uint256) {
		return pointsPerShare.mul(balanceOf(_owner)).toInt256Safe().add(pointsCorrection[_owner]).toUint256Safe() / pointsMultiplier;
	}

	/**
	 * @dev Internal function that transfer tokens from one address to another.
	 * Update pointsCorrection to keep funds unchanged.
	 * @param from The address to transfer from.
	 * @param to The address to transfer to.
	 * @param value The amount to be transferred.
	 */
	function _transfer(address from, address to, uint256 value) internal override {
		super._transfer(from, to, value);
		int256 _magCorrection = pointsPerShare.mul(value).toInt256Safe();
		pointsCorrection[from] = pointsCorrection[from].add(_magCorrection);
		pointsCorrection[to] = pointsCorrection[to].sub(_magCorrection);
	}

	/**
	 * @dev mints tokens to an account.
	 * Update pointsCorrection to keep funds unchanged.
	 * @param account The account that will receive the created tokens.
	 * @param value The amount that will be created.
	 */
	function mint(address account, uint256 value) external override {
		require(hasRole(MINTER_ROLE, msg.sender), "JTrancheB: caller is not a minter");
		require(value > 0, "JTrancheB: value is zero");
        super._mint(account, value);
        pointsCorrection[account] = pointsCorrection[account].sub((pointsPerShare.mul(value)).toInt256Safe());
    }
	
	/** 
	 * @dev Internal function that burns an amount of the token of a given account.
	 * Update pointsCorrection to keep funds unchanged.
	 * @param value The amount that will be burnt.
	 */
	function burn(uint256 value) external override {
		require(value > 0, "JTrancheB: value is zero");
		super._burn(msg.sender, value);
		pointsCorrection[msg.sender] = pointsCorrection[msg.sender].add( (pointsPerShare.mul(value)).toInt256Safe() );
	}

	/**
	 * @notice Withdraws all available funds for a token holder
	 */
	function withdrawFunds() external {
		uint256 withdrawableFunds = _prepareWithdraw();
		require(rewardsToken.transfer(msg.sender, withdrawableFunds), "JTrancheB: withdraw funds transfer failed");
		_updateFundsTokenBalance();
	}