Contract 0x98e119990E3653486d84Ba46b66BbC4d82f7f604

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/Address.sol";

import "./interfaces/IPoolToken.sol";
import "./CoffinOracle.sol";
import "./interfaces/IGatePolicy.sol";

import "./interfaces/IGate.sol";
import "./interfaces/ICollateralReserve.sol";
import "./interfaces/IWETH.sol";

contract Gate is Ownable, Initializable, IGate, ReentrancyGuard {
    using SafeERC20 for ERC20;
    using SafeMath for uint256;
    using Address for address;

    address public oracle;
    address public collateral;
    address public dollar;
    address public policy;
    address public share;

    address public collateralReserve;

    mapping(address => uint256) public redeem_share_balances;
    mapping(address => uint256) public redeem_collateral_balances;

    uint256 public override unclaimed_pool_collateral;
    uint256 public unclaimed_pool_share;

    mapping(address => uint256) public last_redeemed;

    // Constants for various precisions
    uint256 private constant PRICE_PRECISION = 1e6;
    uint256 private constant RATIO_PRECISION = 1e6;

    uint256 private constant COLLATERAL_RATIO_PRECISION = 1e6;
    uint256 private constant COLLATERAL_RATIO_MAX = 1e6;
    uint256 private constant LIMIT_SWAP_TIME = 10 minutes;
    
    // 

    // wrapped ftm
    address private wftmAddress = 0x21be370D5312f44cB42ce377BC9b8a0cEF1A4C83;

    uint256 private missing_decimals;

    // AccessControl state variables
    bool public mint_paused = false;
    bool public redeem_paused = false;
    
    // router address. it's spooky router by default. 
    address routerAddress = 0xF491e7B69E4244ad4002BC14e878a34207E38c29;

        
    /* ========== MODIFIERS ========== */

    modifier notContract() {
        require(!msg.sender.isContract(), "Allow non-contract only");
        _;
    }

    /* ========== CONSTRUCTOR ========== */

    function init(
        address _oracle,
        address _dollar,
        address _share,
        address _collateral,
        address _collateralReserve,
        address _policy
    ) external initializer onlyOwner {
        oracle = _oracle;
        dollar = _dollar;
        share = _share;
        collateral = _collateral;
        missing_decimals = 18 - ERC20(_collateral).decimals();
        collateralReserve = _collateralReserve;
        policy = _policy;
    }

    /* ========== VIEWS ========== */

    function getCollateralPrice() public view override returns (uint256) {
        (uint256 __price, uint8 __d) = ICoffinOracle(oracle).getFTMUSD();
        return __price.mul(PRICE_PRECISION).div(10**__d);
    }

    function getDollarPrice() public view override returns (uint256) {
        (uint256 __price, uint8 __d) = ICoffinOracle(oracle).getCOUSDUSD();
        return __price.mul(PRICE_PRECISION).div(10**__d);
    }

    function getCoffinPrice() public view override returns (uint256) {
        (uint256 __price, uint8 __d) = ICoffinOracle(oracle).getCOFFINUSD();
        return __price.mul(PRICE_PRECISION).div(10**__d);
    }


    // function getCollateralTwap() public view override returns (uint256) {
    //     (uint256 __price, uint8 __d) = ICoffinOracle(oracle).getTwapFTMUSD();
    //     return __price.mul(PRICE_PRECISION).div(10**__d);
    // }

    function getDollarTwap() public view override returns (uint256) {
        (uint256 __price, uint8 __d) = ICoffinOracle(oracle).getTwapCOUSDUSD();
        return __price.mul(PRICE_PRECISION).div(10**__d);
    }

    function getCoffinTwap() public view override returns (uint256) {
        (uint256 __price, uint8 __d) = ICoffinOracle(oracle).getTwapCOFFINUSD();
        return __price.mul(PRICE_PRECISION).div(10**__d);
    }

    /* ========== PUBLIC FUNCTIONS ========== */

    function gateInfo()
        public
        view
        returns (
            uint256 _minting_fee,
            uint256 _redemption_fee,
            uint256 _ex_red_fee,
            uint256 _collateral_price,
            uint256 _share_price,
            uint256 _dollar_price,
            uint256 _share_twap,
            uint256 _dollar_twap,
            // uint256 _ecr,
            uint256 _tcr,
            bool _mint_paused,
            bool _redeem_paused,
            uint256 _unclaimed_pool_collateral,
            uint256 _unclaimed_pool_share
        )
    {
        _minting_fee = IGatePolicy(policy).minting_fee();
        _redemption_fee = IGatePolicy(policy).redemption_fee();
        _ex_red_fee = IGatePolicy(policy).extra_redemption_fee();
        _collateral_price = getCollateralPrice();
        _share_price = getCoffinPrice();
        _dollar_price = getDollarPrice();
        _share_twap = getCoffinTwap();
        _dollar_twap = getDollarTwap();

        _tcr = IGatePolicy(policy).target_collateral_ratio();
        // _ecr = IGatePolicy(policy).getEffectiveCollateralRatio();

        _mint_paused = mint_paused;
        _redeem_paused = redeem_paused;

        _unclaimed_pool_collateral = unclaimed_pool_collateral;
        _unclaimed_pool_share = unclaimed_pool_share;

    }

    // function setWFTMAddress(address adr) external onlyOwner {
    //     wftmAddress = adr;
    // }

    receive() external payable {}

    function rescueFund() external onlyOwner {
        uint256 amount = ERC20(collateral).balanceOf(collateralReserve);
        _requestTransferCollateralFTM(msg.sender, amount);
    }

    function redeem(
        uint256 _dollar_amount,
        uint256 _share_out_min,
        uint256 _collateral_out_min
    ) external nonReentrant {
        uint256 _share_price = 0;
        uint256 _dollar_price = 0;
        if (IGatePolicy(policy).using_twap_for_redeem()) { 
            _share_price = getCoffinTwap();
            _dollar_price = getDollarTwap();
        }
        if (_share_price==0 ) {
            _share_price = getCoffinPrice();
        }
        if (_dollar_price==0) {
            _dollar_price = getDollarPrice();
        }

        uint256 _redemption_fee = IGatePolicy(policy).redemption_fee();
        uint256 extra_redemption_fee = IGatePolicy(policy).extra_redemption_fee();
        uint256 price_target = IGatePolicy(policy).price_target();

        // uint256 _redemption_fee = redemption_fee;
        if (_dollar_price < price_target) {
            _redemption_fee += extra_redemption_fee;
        }

        uint256 _ecr = IGatePolicy(policy).getEffectiveCollateralRatio();

        uint256 _collateral_price = getCollateralPrice();
        require(_collateral_price > 0, "Invalid collateral price");
        require(_share_price > 0, "Invalid share price");
        uint256 _dollar_amount_post_fee = _dollar_amount - ((_dollar_amount * _redemption_fee) / PRICE_PRECISION);
        uint256 _collateral_output_amount = 0;
        uint256 _share_output_amount = 0;

        if (_ecr < COLLATERAL_RATIO_MAX) {
            uint256 _share_output_value 
                = _dollar_amount_post_fee - ((_dollar_amount_post_fee * _ecr) / PRICE_PRECISION);
            _share_output_amount 
                = (_share_output_value * PRICE_PRECISION) / _share_price;
        }

        if (_ecr > 0) {
            uint256 _collateral_output_value 
                = ((_dollar_amount_post_fee * _ecr) / PRICE_PRECISION) / (10**missing_decimals);
            _collateral_output_amount 
                = (_collateral_output_value * PRICE_PRECISION) / _collateral_price;
        }

        // Check if collateral balance meets and meet output expectation
        uint256 _totalCollateralBalance = globalCollateralBalance();
        require(_collateral_output_amount <= _totalCollateralBalance, "<collateralBalance");
        require(_collateral_out_min <= _collateral_output_amount , ">> slippage than expected...");
        require(_share_out_min <= _share_output_amount, ">> slippage than expected......");

        if (_collateral_output_amount > 0) {
            redeem_collateral_balances[msg.sender] = redeem_collateral_balances[msg.sender] + _collateral_output_amount;
            unclaimed_pool_collateral = unclaimed_pool_collateral + _collateral_output_amount;
        }
        
        if (_share_output_amount > 0) {
            redeem_share_balances[msg.sender] = redeem_share_balances[msg.sender] + _share_output_amount;
            unclaimed_pool_share = unclaimed_pool_share + _share_output_amount;
        }

        last_redeemed[msg.sender] = block.timestamp;

        uint256 dollar_amount = _dollar_amount;
        IPoolToken(dollar).pool_burn_from(msg.sender, dollar_amount);
        if (_share_output_amount > 0) {
            _mintShareToCollateralReserve(_share_output_amount);
        }
    }

    // mint CoUSD(dollar) by  COFFIN(share) & FTM(collateral)
    function mint(uint256 _share_amount, uint256 _dollar_out_min) external payable nonReentrant {
        require(mint_paused == false, "Minting is paused");
        require(msg.value > 0, "need FTM");

        uint256 _collateral_amount = msg.value;

        uint256 _minting_fee = IGatePolicy(policy).minting_fee();

        uint256 _share_price = 0;
        if (IGatePolicy(policy).using_twap_for_mint()) {
            _share_price = getCoffinTwap();
        }
        if (_share_price==0) {
            _share_price = getCoffinPrice();
        }
    
        uint256 _tcr = IGatePolicy(policy).target_collateral_ratio();
        uint256 _price_collateral = getCollateralPrice();
        uint256 _total_dollar_value = 0;
        uint256 _required_share_amount = 0;
        if (_tcr > 0) {
            uint256 _collateral_value 
                = ((_collateral_amount * (10**missing_decimals)) * _price_collateral) / PRICE_PRECISION;
            _total_dollar_value = (_collateral_value * COLLATERAL_RATIO_PRECISION) / _tcr;
            if (_tcr < COLLATERAL_RATIO_MAX) {
                // 0 < _tcr <100
                require(_share_price > 0, "Invalid share price");
                _required_share_amount = ((_total_dollar_value - _collateral_value) * PRICE_PRECISION) / _share_price;
            }
        } else {
            // _tcr == 0
            require(_share_price > 0, "Invalid share price");
            _total_dollar_value = (_share_amount * _share_price) / PRICE_PRECISION;
            _required_share_amount = _share_amount;
        }
        uint256 _actual_dollar_amount = _total_dollar_value - ((_total_dollar_value * _minting_fee) / PRICE_PRECISION);
        require(_dollar_out_min <= _actual_dollar_amount, 
            "_actual_dollar_amount is smaller than _dollar_out_min. slippage is bigger than you expected.  ");

        if (_required_share_amount > 0) {
            require(_required_share_amount <= _share_amount, "Not enough SHARE input");
            IPoolToken(share).pool_burn_from(msg.sender, _required_share_amount);
        }
        if (_collateral_amount > 0) {
            IWETH(wftmAddress).deposit{value: _collateral_amount}();
            _transferCollateralToReserve(_collateral_amount);
        }

        IPoolToken(dollar).pool_mint(msg.sender, _actual_dollar_amount);

    }

    function collectRedemption() external nonReentrant {
        uint256 redemption_delay = IGatePolicy(policy).redemption_delay();
        require((last_redeemed[msg.sender] + redemption_delay) <= block.timestamp, "<redemption_delay");
        
        // update 
        // IGatePolicy(policy).refreshCollateralRatio(true);

        bool _send_share = false;
        bool _send_collateral = false;
        uint256 _share_amount;
        uint256 _collateral_amount;

        // Use Checks-Effects-Interactions pattern
        if (redeem_share_balances[msg.sender] > 0) {
            _share_amount = redeem_share_balances[msg.sender];
            redeem_share_balances[msg.sender] = 0;
            unclaimed_pool_share = unclaimed_pool_share - _share_amount;
            _send_share = true;
        }

        if (redeem_collateral_balances[msg.sender] > 0) {
            _collateral_amount = redeem_collateral_balances[msg.sender];
            redeem_collateral_balances[msg.sender] = 0;
            unclaimed_pool_collateral = unclaimed_pool_collateral - _collateral_amount;
            _send_collateral = true;
        }

        if (_send_share) {
            _requestTransferShare(msg.sender, _share_amount);
        }

        if (_send_collateral) {
            _requestTransferCollateralFTM(msg.sender, _collateral_amount);
        }
    }

    /* ========== INTERNAL FUNCTIONS ========== */

    // transfer collateral(wftm) from a user to reserve directly by transferFrom.
    function _transferWFTMCollateralToReserve(address _sender, uint256 _amount) internal {
        require(collateralReserve != address(0), "Invalid reserve address");
        ERC20(collateral).safeTransferFrom(_sender, collateralReserve, _amount);
    }

    // transfer collateral(wftm) from the gate to reserve.
    function _transferCollateralToReserve(uint256 _amount) internal {
        require(collateralReserve != address(0), "Invalid reserve address");
        ERC20(collateral).safeTransfer(collateralReserve, _amount);
    }

    // mint share(ERC20) to reserve.
    function _mintShareToCollateralReserve(uint256 _amount) internal {
        require(collateralReserve != address(0), "Invalid reserve address");
        IPoolToken(share).pool_mint(collateralReserve, _amount);
    }

    // transfer collateral(wftm) from reserve to the gate.
    // then convert wftm to ftm, then transfer it to a user.
    function _requestTransferCollateralFTM(address to, uint256 amount) internal {
        require(to != address(0), "Invalid reserve address");
        ICollateralReserve(collateralReserve).transferTo(collateral, address(this), amount);
        IWETH(wftmAddress).withdraw(amount);
        payable(to).transfer(amount);
    }

    // transfer collateral(wftm) from reserve to a user.
    function _requestTransferCollateralWrappedFTM(address _receiver, uint256 _amount) internal {
        ICollateralReserve(collateralReserve).transferTo(collateral, _receiver, _amount);
    }

    // transfer share(ERC20) from reserve to users.
    function _requestTransferShare(address _receiver, uint256 _amount) internal {
        ICollateralReserve(collateralReserve).transferTo(share, _receiver, _amount);
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    function toggleMinting() external onlyOwner {
        mint_paused = !mint_paused;
    }

    function toggleRedeeming() external onlyOwner {
        redeem_paused = !redeem_paused;
    }


    function setOracle(address _oracle) external onlyOwner {
        require(_oracle != address(0), "Invalid address");
        oracle = _oracle;
    }


    function setPolicy(address _policy) external onlyOwner {
        require(_policy != address(0), "Invalid address");
        policy = _policy;
    }

    function getDollarSupply() public view override returns (uint256) {
        return IERC20(dollar).totalSupply();
    }

    function getCoffinSupply() public view override returns (uint256) {
        return IERC20(share).totalSupply();
    }

    function globalCollateralValue() public view override returns (uint256) {
        return (globalCollateralBalance() * getCollateralPrice() * (10**missing_decimals)) / PRICE_PRECISION;
    }

    function globalCollateralBalance() public view override returns (uint256) {
        uint256 _collateralReserveBalance = IERC20(collateral).balanceOf(collateralReserve);
        return _collateralReserveBalance - unclaimed_pool_collateral;
    }

    function setCollateralReserve(address _collateralReserve) public onlyOwner {
        require(_collateralReserve != address(0), "invalidAddress");
        collateralReserve = _collateralReserve;
    }

    function getCollateralBalance() public view override returns (uint256) {
        return IERC20(collateral).balanceOf(collateralReserve);
    }


    event ZapSwapped(uint256 indexed collateralAmount, uint256 indexed shareAmount);

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * 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 ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override 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 this function is
     * overridden;
     *
     * 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 override returns (uint8) {
        return 18;
    }

    /**
     * @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);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        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] + 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) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This 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);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(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:
     *
     * - `account` 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 += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(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);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(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 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 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 {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

interface IPoolToken {
    function pool_burn_from(address _address, uint256 _amount) external;
    function approve(address a, uint256 b) external returns (bool);
    function pool_mint(address _address, uint256 m_amount) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/proxy/utils/Initializable.sol";

import "@openzeppelin/contracts/access/Ownable.sol";
import "./interfaces/IUniswapV2Router02.sol";
import "./interfaces/IUniswapV2Factory.sol";
import "./interfaces/IUniswapLP.sol";
import "./libs/FixedPoint.sol";
import "./interfaces/IBandStdReference.sol";


interface ICoffinOracle {
    function PERIOD() external view returns (uint32);
    function getCOFFINUSD() external view returns (uint256, uint8);
    function updateTwap(address token0, address token1) external ;
    function getCOUSDUSD() external view returns (uint256, uint8);
    function getTwapCOUSDUSD() external view returns (uint256, uint8);
    function getTwapCOFFINUSD() external view returns (uint256, uint8);
    function getTwapXCOFFINUSD() external view returns (uint256, uint8);
    function updateTwapDollar() external ;
    function updateTwapCoffin() external ;
    function updateTwapXCoffin() external ;
    function getXCOFFINUSD() external view returns (uint256, uint8);
    function getCOUSDFTM() external view returns (uint256, uint8);
    function getXCOFFINFTM() external view returns (uint256, uint8);
    function getCOFFINFTM() external view returns (uint256, uint8);
    function getFTMUSD() external view returns (uint256, uint8);

}

contract MockCoffinOracle is ICoffinOracle, Ownable {
    uint256 public xcoffinftm = (1 / 2) * 1 * 10**18;
    uint256 public coffinftm = 2 * 1 * 10**18;
    uint256 public ftmusd = (1 / 4) * 1 * 10**18;
    uint256 public cousdftm = (101 / 100) * 4 * 1 * 10**18;
    uint32 public override PERIOD = 600; // 10-minute TWAP 

    function updateTwap(address token0, address token1) external override {

    }
    function updateTwapDollar() external override{

    }
    function updateTwapCoffin() external override{

    }
    function updateTwapXCoffin() external override{

    }
    function setCOUSDFTM(uint256 val) external {
        cousdftm = val;
    }

    function getCOUSDFTM() public view override returns (uint256, uint8) {
        return (cousdftm, 18);
    }

    function setXCOFFINFTM(uint256 val) external {
        xcoffinftm = val;
    }

    function getXCOFFINFTM() public view override returns (uint256, uint8) {
        return (xcoffinftm, 18);
    }

    function setCOFFINFTM(uint256 val) external {
        coffinftm = val;
    }

    function getCOFFINFTM() public view override returns (uint256, uint8) {
        return (coffinftm, 18);
    }

 
    uint256 public cousdusd = 1030000000000000000;
    function setCOUSDUSD(uint256 val) external {
        cousdusd = val;// decimal 18 
    }
    function getCOUSDUSD() public view override returns(uint256,uint8){
        return (cousdusd,18);// decimal 18 
    }
    
 
    
    function setFTMUSD(uint256 val) external {
        ftmusd = val;
    }

    function getFTMUSD() public view override returns (uint256, uint8) {
        return (ftmusd, 18);
    }


    function getCOFFINUSD() public view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }

    function getXCOFFINUSD() public view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getXCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }

    function getTwapCOUSDUSD() external view override returns (uint256, uint8){
        return getCOUSDUSD();
    }
    function getTwapCOFFINUSD() external view override returns (uint256, uint8){
        return getCOFFINUSD();
    }
    function getTwapXCOFFINUSD() external view override returns (uint256, uint8){
        return getXCOFFINUSD();
    }

}


contract CoffinOracle is ICoffinOracle, Initializable,Ownable {
    using SafeMath for uint256;
    using FixedPoint for *;

    IUniswapV2Router02 public uniswapv2router;
    address public coffin;
    address public dollar;
    address public xcoffin;
    address public wftm = 0x21be370D5312f44cB42ce377BC9b8a0cEF1A4C83;
    address public usdc = 0x04068DA6C83AFCFA0e13ba15A6696662335D5B75;
    address public dai = 0x8D11eC38a3EB5E956B052f67Da8Bdc9bef8Abf3E;
    address public boo = 0x841FAD6EAe12c286d1Fd18d1d525DFfA75C7EFFE;
    IBandStdReference bandRef;
    uint32 public override PERIOD = 600; // 10-minute TWAP

    struct Pair {
        uint256 price0CumulativeLast;
        uint256 price1CumulativeLast;
        uint32 blockTimestampLast;
        FixedPoint.uq112x112 price0Average;
        FixedPoint.uq112x112 price1Average;
        bool initialized;
    }

    mapping(address => Pair) public getPair;

    function setPeriod(uint32 _period) external onlyOwner {
        PERIOD = _period;
    }

    function init(
        address _coffinAddress,
        address _cousdAddress,
        address _xcoffinAddress
    ) external  initializer onlyOwner{
        // router address. it's spooky router by default. 
        address routerAddress = 0xF491e7B69E4244ad4002BC14e878a34207E38c29;
        setRouter(routerAddress);

        address fantomBandProtocol = 0x56E2898E0ceFF0D1222827759B56B28Ad812f92F;

        setBandOracle(fantomBandProtocol);
        setCOFFINAddress(_coffinAddress);
        setDollarAddress(_cousdAddress);
        setXCOFFINAddress(_xcoffinAddress);
    }

    function getBandRate(string memory token0, string memory token1)
        public
        view
        returns (uint256)
    {
        IBandStdReference.ReferenceData memory data = bandRef.getReferenceData(
            token0,
            token1
        );
        return data.rate;
    }


    function getFTMUSD() public view override returns (uint256, uint8) {
        return (getBandRate("FTM","USD"), 18);
    }

    



    function setCOFFINAddress(address _coffinAddress) public onlyOwner {
        coffin = _coffinAddress;
    }

    function setXCOFFINAddress(address _xcoffinAddress) public onlyOwner {
        xcoffin = _xcoffinAddress;
    }

    function setDollarAddress(address _cousdAddress) public onlyOwner {
        dollar = _cousdAddress;
    }

    function setRouter(address _uniswapv2routeraddress)
        public
        onlyOwner
    {
        uniswapv2router = IUniswapV2Router02(_uniswapv2routeraddress);
    }

    function setBandOracle(address _bandOracleAddress) public onlyOwner {
        bandRef = IBandStdReference(_bandOracleAddress);
    }


    function getCOFFINUSD() external view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }

    function getTwapCOFFINUSD() external view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getTwapCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }
    
    function getUSDCUSD() public view  returns (uint256, uint8) {
        return (getBandRate("USDC","USD"), 18);
    }
    function getDAIUSD() public view  returns (uint256, uint8) {
        return (getBandRate("DAI","USD"), 18);
    }
    
    uint8 public oracleMode = 0; 

    function enableFTMOracle() external onlyOwner {
        oracleMode = 1;
    }
    function enableDAIOracle() external onlyOwner {
        oracleMode = 2 ;
    }
    function enableUSDCracle() external onlyOwner {
        oracleMode = 0 ;
    }

    function getCOUSDUSD() external view override returns (uint256, uint8) {
        if (oracleMode==1) {
            (uint256 v1, uint8 d1) = getCOUSDFTM();
            (uint256 v2, uint8 d2) = getFTMUSD();
            return ((v1 * v2) / (10**d1), d2);
        } else if (oracleMode==2) {
            (uint256 v1, uint8 d1) = getCOUSDDAI();
            (uint256 v2, uint8 d2) = getDAIUSD();
            return ((v1 * v2) / (10**d1), d2);
        } else {
            (uint256 v1, uint8 d1) = getCOUSDUSDC();
            (uint256 v2, uint8 d2) = getUSDCUSD();
            return ((v1 * v2) / (10**d1), d2);
        }
    }

    function getTwapCOUSDUSD() external view override returns (uint256, uint8) {
        if (oracleMode==1) {
            (uint256 v1, uint8 d1) = getTwapCOUSDFTM();
            (uint256 v2, uint8 d2) = getFTMUSD();
            return ((v1 * v2) / (10**d1), d2);
        } else if (oracleMode==2) {   
            (uint256 v1, uint8 d1) = getTwapCOUSDDAI();
            (uint256 v2, uint8 d2) = getDAIUSD();
            return ((v1 * v2) / (10**d1), d2);
        } else {
            (uint256 v1, uint8 d1) = getTwapCOUSDUSDC();
            (uint256 v2, uint8 d2) = getUSDCUSD();
            return ((v1 * v2) / (10**d1), d2);     
        }

    }

    
    


    function getXCOFFINUSD() external view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getXCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }

    function getTwapXCOFFINUSD() external view override returns (uint256, uint8) {
        (uint256 v1, uint8 d1) = getTwapXCOFFINFTM();
        (uint256 v2, uint8 d2) = getFTMUSD();
        return ((v1 * v2) / (10**d1), d2);
    }

    function getTwapCOUSDFTM() public view  returns (uint256, uint8) {
        (uint256 a, uint8 b) = getTwapRate(dollar,wftm);
        if (a>0) {
            return (a,b);
        }
        return getRealtimeRate(dollar,wftm);
    }
    
    function getTwapCOUSDDAI() public view  returns (uint256, uint8) {
        (uint256 a, uint8 b) = getTwapRate(dollar,dai);
        if (a>0) {
            return (a,b);
        }
        return getRealtimeRate(dollar,usdc);
    }
    function getTwapCOUSDUSDC() public view  returns (uint256, uint8) {
        (uint256 a, uint8 b) = getTwapRate(dollar,usdc);
        if (a>0) {
            return (a,b);
        }
        return getRealtimeRate(dollar,usdc);
    }
    
    function getCOUSDFTM() public view override returns (uint256, uint8) {
        return getRealtimeRate(dollar,wftm);
    }
    function getCOUSDUSDC() public view returns (uint256, uint8) {
        return getRealtimeRate(dollar,usdc);
    }
    function getCOUSDDAI() public view returns (uint256, uint8) {
        return getRealtimeRate(dollar,dai);
    }
    

    function getTwapXCOFFINFTM() public view  returns (uint256, uint8) {
        (uint256 a, uint8 b) = getTwapRate(xcoffin,wftm);
        if (a>0) {
            return (a,b);
        }
        return getRealtimeRate(xcoffin,wftm);
    }

    function getXCOFFINFTM() public view override returns (uint256, uint8) {
        return getRealtimeRate(xcoffin,wftm);
    }

    function getTwapCOFFINFTM() public view returns (uint256, uint8) {
        (uint256 a, uint8 b) = getTwapRate(coffin,wftm);
        if (a>0) {
            return (a,b);
        }
        return getRealtimeRate(coffin,wftm);
    }
    function getCOFFINFTM() public view override returns (uint256, uint8) {
        return getRealtimeRate(coffin,wftm);
    }


    function currentBlockTimestamp() internal view returns (uint32) {
        return uint32(block.timestamp % 2**32);
    }

    function currentCumulativePrices(address uniswapV2Pair)
        internal
        view
        returns (
            uint256 price0Cumulative,
            uint256 price1Cumulative,
            uint32 blockTimestamp
        )
    {
        // Pair storage pairStorage = getPair[uniswapV2Pair];

        blockTimestamp = currentBlockTimestamp();
        IUniswapLP uniswapPair = IUniswapLP(uniswapV2Pair);
        price0Cumulative = uniswapPair.price0CumulativeLast();
        price1Cumulative = uniswapPair.price1CumulativeLast();

        // if time has elapsed since the last update on the pair, mock the accumulated price values
        (uint112 reserve0, uint112 reserve1, uint32 _blockTimestampLast) = uniswapPair.getReserves();
        if (_blockTimestampLast != blockTimestamp) {
            // subtraction overflow is desired
            uint32 timeElapsed = blockTimestamp - _blockTimestampLast;
            // addition overflow is desired
            // counterfactual
            price0Cumulative += uint256(FixedPoint.fraction(reserve1, reserve0)._x) * timeElapsed;
            // counterfactual
            price1Cumulative += uint256(FixedPoint.fraction(reserve0, reserve1)._x) * timeElapsed;
        }
    }


    function getTwapRate(address token0, address token1)
        public
        view
        returns (uint256 priceLatest, uint8 decimals)
    {
        address[] memory path = new address[](2);
        path[0] = token0;
        path[1] = token1;
        address factory = address(uniswapv2router.factory());
        address uniswapV2Pair = IUniswapV2Factory(factory).getPair(token0, token1);

        if (uniswapV2Pair== address(0)) {
            return (0,0);
        } 

        // Pair memory pair = getPair[uniswapV2Pair];
        Pair storage pairStorage = getPair[uniswapV2Pair];

        // require(pairStorage.initialized, "need to setup first");
        if (!pairStorage.initialized) {
            return getRealtimeRate(token0, token1);
            // return (0,0);
        }
        
        (uint256 price0Cumulative, uint256 price1Cumulative, uint32 blockTimestamp) = currentCumulativePrices(
            address(uniswapV2Pair)
        );
        uint32 timeElapsed = blockTimestamp - pairStorage.blockTimestampLast; // Overflow is desired

        FixedPoint.uq112x112 memory price0Average 
            = FixedPoint.uq112x112(uint224((price0Cumulative - pairStorage.price0CumulativeLast) / timeElapsed));
        FixedPoint.uq112x112 memory price1Average 
            = FixedPoint.uq112x112(uint224((price1Cumulative - pairStorage.price1CumulativeLast) / timeElapsed));

        uint256 amountIn = 1e18;
        if (IUniswapLP(uniswapV2Pair).token0() == token0) {
            priceLatest = uint256(price0Average.mul(amountIn).decode144());
            decimals = ERC20(token1).decimals();
        } else {
            require(IUniswapLP(uniswapV2Pair).token0() == token1, "TwapOracle: INVALID_TOKEN");
            priceLatest = uint256(price1Average.mul(amountIn).decode144());
            decimals = ERC20(token0).decimals();
        }
    }

    function getTwapRateWithUpdate(address token0, address token1)
        external
        returns (uint256 priceLatest, uint8 decimals)
    {
        updateTwap(token0,token1);
        return getTwapRate(token0,token1);
    }
    

    function updateTwapDollarFTM() public  {
        updateTwap(dollar, wftm);
    }
    function updateTwapDollar() public override {
        updateTwap(dollar, dai);
    }
    function updateTwapDollarUSDC() public  {
        updateTwap(dollar, usdc);
    }
    function updateTwapCoffin() public override {
        updateTwap(coffin, wftm);
    }
    function updateTwapXCoffin() public override {
        updateTwap(xcoffin, wftm);
    }

    function updateTwap(address token0, address token1) public override {

        address[] memory path = new address[](2);
        path[0] = token0;
        path[1] = token1;
        address factory = address(uniswapv2router.factory());
        address uniswapV2Pair = IUniswapV2Factory(factory).getPair(token0, token1);

        if (uniswapV2Pair== address(0)) {
            return;
        }
        Pair storage pairStorage = getPair[uniswapV2Pair];
        // require(pairStorage.initialized, "need to setup first");
        
        (uint256 price0Cumulative, uint256 price1Cumulative, uint32 blockTimestamp) = currentCumulativePrices(
            address(uniswapV2Pair)
        );

        if (!pairStorage.initialized) {
            // first time 
            pairStorage.price0CumulativeLast = price0Cumulative;
            pairStorage.price1CumulativeLast = price1Cumulative;
            pairStorage.blockTimestampLast = blockTimestamp;
            pairStorage.initialized = true;
            return;
        }

        // Overflow is desired
        uint32 timeElapsed = blockTimestamp - pairStorage.blockTimestampLast; 
        
        // Ensure that at least one full period has passed since the last update
        if (timeElapsed < PERIOD) {
            return ;
        }
        
        pairStorage.price0Average 
            = FixedPoint.uq112x112(uint224((price0Cumulative - pairStorage.price0CumulativeLast) / timeElapsed));
        pairStorage.price1Average 
            = FixedPoint.uq112x112(uint224((price1Cumulative - pairStorage.price1CumulativeLast) / timeElapsed));
        pairStorage.price0CumulativeLast = price0Cumulative;
        pairStorage.price1CumulativeLast = price1Cumulative;
        pairStorage.blockTimestampLast = blockTimestamp;
    }

    function getRealtimeRate(address tokenA, address tokenB)
        public
        view
        returns (uint256 priceLatest, uint8 decimals)
    {

        address factory = address(uniswapv2router.factory());
        address pair = IUniswapV2Factory(factory).getPair(tokenA, tokenB);
        if (pair== address(0)) {
            return (0,0);
        }
        
        (uint112 reserve0, uint112 reserve1,) =
            IUniswapLP(pair).getReserves();
        if (IUniswapLP(pair).token0()==address(tokenA)) {
            priceLatest = uint256(reserve1).mul(uint256(10**ERC20(tokenA).decimals())).div(uint256(reserve0));
            decimals = ERC20(tokenB).decimals();
        } else {
            priceLatest = uint256(reserve0).mul(uint256(10**ERC20(tokenA).decimals())).div(uint256(reserve1));
            decimals = ERC20(tokenB).decimals();
        }

        if ((18-decimals)>0) { 
            priceLatest = priceLatest.mul(10**(18-decimals));
            decimals = 18;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;
pragma experimental ABIEncoderV2;

interface IGatePolicy {
    function target_collateral_ratio() external view returns (uint256);
    function redemption_delay() external view returns (uint256);
    // function effective_collateral_ratio() external view returns (uint256);
    function getEffectiveCollateralRatio() external view returns (uint256); 
    function refreshCollateralRatio(bool noerror) external  ; 
    function redemption_fee() external view returns (uint256); 
    function extra_redemption_fee() external view returns (uint256); 
    function minting_fee() external view returns (uint256); 
    function price_target() external view returns (uint256); 
    function using_twap_for_redeem() external view returns (bool); 
    function using_twap_for_mint() external view returns (bool); 
    function using_twap_for_tcr() external view returns (bool); 
    
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;


interface IGate {

    function unclaimed_pool_collateral() external view returns (uint256);


    function globalCollateralValue() external view returns (uint256) ;

    function getCollateralPrice() external view returns (uint256);
    function getDollarPrice() external view returns (uint256) ;
    function getCoffinPrice() external view returns (uint256) ;

    // function getCollateralTwap() external view returns (uint256);
    function getDollarTwap() external view returns (uint256) ;
    function getCoffinTwap() external view returns (uint256) ;

    
    function getDollarSupply() external view returns (uint256) ;

    function getCoffinSupply() external view returns (uint256) ;

    function globalCollateralBalance() external view returns (uint256);

    function getCollateralBalance() external view returns (uint256);

}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

interface ICollateralReserve {
    function transferTo(
        address _token,
        address _receiver,
        uint256 _amount
    ) external;
    function fundBalance
    (
        address _token
    ) external view returns (uint256) ;

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

interface IWETH {
    function deposit() external payable;

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address src,
        address dst,
        uint256 wad
    ) external returns (bool);

    function withdraw(uint256) external;

    function balanceOf(address account) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.11;

import "./IUniswapV2Router01.sol";

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    ) external returns (uint256 amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint256 liquidity,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

}

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.7;
interface IUniswapV2Factory {

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.7;
pragma experimental ABIEncoderV2;

interface IUniswapLP {
    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function getTokenWeights() external view returns (uint32 tokenWeight0, uint32 tokenWeight1);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

import "./Babylonian.sol";

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
library FixedPoint {
    // range: [0, 2**112 - 1]
    // resolution: 1 / 2**112
    struct uq112x112 {
        uint224 _x;
    }

    // range: [0, 2**144 - 1]
    // resolution: 1 / 2**112
    struct uq144x112 {
        uint256 _x;
    }

    uint8 private constant RESOLUTION = 112;
    uint256 private constant Q112 = uint256(1) << RESOLUTION;
    uint256 private constant Q224 = Q112 << RESOLUTION;

    // encode a uint112 as a UQ112x112
    function encode(uint112 x) internal pure returns (uq112x112 memory) {
        return uq112x112(uint224(x) << RESOLUTION);
    }

    // encodes a uint144 as a UQ144x112
    function encode144(uint144 x) internal pure returns (uq144x112 memory) {
        return uq144x112(uint256(x) << RESOLUTION);
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function div(uq112x112 memory self, uint112 x) internal pure returns (uq112x112 memory) {
        require(x != 0, "FixedPoint: DIV_BY_ZERO");
        return uq112x112(self._x / uint224(x));
    }

    // multiply a UQ112x112 by a uint, returning a UQ144x112
    // reverts on overflow
    function mul(uq112x112 memory self, uint256 y) internal pure returns (uq144x112 memory) {
        uint256 z;
        require(y == 0 || (z = uint256(self._x) * y) / y == uint256(self._x), "FixedPoint: MULTIPLICATION_OVERFLOW");
        return uq144x112(z);
    }

    // returns a UQ112x112 which represents the ratio of the numerator to the denominator
    // equivalent to encode(numerator).div(denominator)
    function fraction(uint112 numerator, uint112 denominator) internal pure returns (uq112x112 memory) {
        require(denominator > 0, "FixedPoint: DIV_BY_ZERO");
        return uq112x112((uint224(numerator) << RESOLUTION) / denominator);
    }

    // decode a UQ112x112 into a uint112 by truncating after the radix point
    function decode(uq112x112 memory self) internal pure returns (uint112) {
        return uint112(self._x >> RESOLUTION);
    }

    // decode a UQ144x112 into a uint144 by truncating after the radix point
    function decode144(uq144x112 memory self) internal pure returns (uint144) {
        return uint144(self._x >> RESOLUTION);
    }

    // take the reciprocal of a UQ112x112
    function reciprocal(uq112x112 memory self) internal pure returns (uq112x112 memory) {
        require(self._x != 0, "FixedPoint: ZERO_RECIPROCAL");
        return uq112x112(uint224(Q224 / self._x));
    }

    // square root of a UQ112x112
    function sqrt(uq112x112 memory self) internal pure returns (uq112x112 memory) {
        return uq112x112(uint224(Babylonian.sqrt(uint256(self._x)) << 56));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

interface IBandStdReference {
    /// A structure returned whenever someone requests for standard reference data.
    struct ReferenceData {
        uint256 rate; // base/quote exchange rate, multiplied by 1e18.
        uint256 lastUpdatedBase; // UNIX epoch of the last time when base price gets updated.
        uint256 lastUpdatedQuote; // UNIX epoch of the last time when quote price gets updated.
    }

    /// Returns the price data for the given base/quote pair. Revert if not available.
    function getReferenceData(string memory _base, string memory _quote)
        external
        view
        returns (ReferenceData memory);
    
    /// Similar to getReferenceData, but with multiple base/quote pairs at once.
    function getReferenceDataBulk(
        string[] memory _bases,
        string[] memory _quotes
    ) external view returns (ReferenceData[] memory);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

interface IUniswapV2Router01 {
    function factory() external view   returns (address);
    function WETH() external view  returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.7;

// computes square roots using the babylonian method
// https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method
library Babylonian {
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
        // else z = 0
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 500
  },
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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56","name":"_share_out_min","type":"uint256"},{"internalType":"uint256","name":"_collateral_out_min","type":"uint256"}],"name":"redeem","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"redeem_collateral_balances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"redeem_paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"redeem_share_balances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rescueFund","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_collateralReserve","type":"address"}],"name":"setCollateralReserve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_oracle","type":"address"}],"name":"setOracle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_policy","type":"address"}],"name":"setPolicy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"share","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"toggleMinting","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"toggleRedeeming","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unclaimed_pool_collateral","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"unclaimed_pool_share","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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