// File: contracts/RiskManager.sol



// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.6;

import "./Governable.sol";
import "./interface/IVault.sol";
import "./interface/IRegistry.sol";
import "./interface/IProduct.sol";
import "./interface/IPolicyManager.sol";
import "./interface/IRiskManager.sol";


/**
 * @title RiskManager
 * @author solace.fi
 * @notice Calculates the acceptable risk, sellable cover, and capital requirements of Solace products and capital pool.
 *
 * The total amount of sellable coverage is proportional to the assets in the [**risk backing capital pool**](./Vault). The max cover is split amongst products in a weighting system. [**Governance**](/docs/protocol/governance) can change these weights and with it each product's sellable cover.
 *
 * The minimum capital requirement is proportional to the amount of cover sold to [active policies](./PolicyManager).
 *
 * Solace can use leverage to sell more cover than the available capital. The amount of leverage is stored as [`partialReservesFactor`](#partialreservesfactor) and is settable by [**governance**](/docs/protocol/governance).
 */
contract RiskManager is IRiskManager, Governable {

    /***************************************
    GLOBAL VARIABLES
    ***************************************/

    // enumerable map product address to uint32 weight
    mapping(address => uint256) internal _productToIndex;
    mapping(uint256 => address) internal _indexToProduct;
    uint256 internal _productCount;
    mapping(address => ProductRiskParams) internal _productRiskParams;
    uint32 internal _weightSum;

    // Multiplier for minimum capital requirement in BPS.
    uint16 internal _partialReservesFactor;
    // 10k basis points (100%)
    uint16 internal constant MAX_BPS = 10000;

    // Registry
    IRegistry internal _registry;

    /**
     * @notice Constructs the RiskManager contract.
     * @param governance_ The address of the [governor](/docs/protocol/governance).
     * @param registry_ Address of registry.
     */
    constructor(address governance_, address registry_) Governable(governance_) {
        require(registry_ != address(0x0), "zero address registry");
        _registry = IRegistry(registry_);
        _weightSum = type(uint32).max; // no div by zero
        _partialReservesFactor = MAX_BPS;
    }

    /***************************************
    MAX COVER VIEW FUNCTIONS
    ***************************************/

    /**
     * @notice Given a request for coverage, determines if that risk is acceptable and if so at what price.
     * @param prod The product that wants to sell coverage.
     * @param currentCover If updating an existing policy's cover amount, the current cover amount, otherwise 0.
     * @param newCover The cover amount requested.
     * @return acceptable True if risk of the new cover is acceptable, false otherwise.
     * @return price The price in wei per 1e12 wei of coverage per block.
     */
    function assessRisk(address prod, uint256 currentCover, uint256 newCover) external view override returns (bool acceptable, uint24 price) {
        // must be a registered product
        if(_productToIndex[prod] == 0) return (false, type(uint24).max);
        // max cover checks
        uint256 mc = maxCover();
        ProductRiskParams storage params = _productRiskParams[prod];
        // must be less than maxCoverPerProduct
        mc = mc * params.weight / _weightSum;
        uint256 productActiveCoverAmount = IProduct(prod).activeCoverAmount();
        productActiveCoverAmount = productActiveCoverAmount + newCover - currentCover;
        if(productActiveCoverAmount > mc) return (false, params.price);
        // must be less than maxCoverPerPolicy
        mc = mc / params.divisor;
        if(newCover > mc) return (false, params.price);
        // risk is acceptable
        return (true, params.price);
    }

    /**
     * @notice The maximum amount of cover that Solace as a whole can sell.
     * @return cover The max amount of cover in wei.
     */
    function maxCover() public view override returns (uint256 cover) {
        return IVault(payable(_registry.vault())).totalAssets() * MAX_BPS / _partialReservesFactor;
    }

    /**
     * @notice The maximum amount of cover that a product can sell in total.
     * @param prod The product that wants to sell cover.
     * @return cover The max amount of cover in wei.
     */
    function maxCoverPerProduct(address prod) public view override returns (uint256 cover) {
        return maxCover() * _productRiskParams[prod].weight / _weightSum;
    }

    /**
     * @notice The amount of cover that a product can still sell.
     * @param prod The product that wants to sell cover.
     * @return cover The max amount of cover in wei.
     */
    function sellableCoverPerProduct(address prod) external view override returns (uint256 cover) {
        // max cover
        uint256 mc = maxCoverPerProduct(prod);
        // active cover
        uint256 ac = IProduct(prod).activeCoverAmount();
        // diff non underflow
        return (mc < ac)
          ? 0
          : (mc - ac);
    }

    /**
     * @notice The maximum amount of cover that a product can sell in a single policy.
     * @param prod The product that wants to sell cover.
     * @return cover The max amount of cover in wei.
     */
    function maxCoverPerPolicy(address prod) external view override returns (uint256 cover) {
        ProductRiskParams storage params = _productRiskParams[prod];
        require(params.weight > 0, "product inactive");
        return maxCover() * params.weight / (_weightSum * params.divisor);
    }

    /**
     * @notice Checks is an address is an active product.
     * @param prod The product to check.
     * @return status Returns true if the product is active.
     */
    function productIsActive(address prod) external view override returns (bool status) {
        return _productToIndex[prod] != 0;
    }

    /**
     * @notice Return the number of registered products.
     * @return count Number of products.
     */
    function numProducts() external view override returns (uint256 count) {
        return _productCount;
    }

    /**
     * @notice Return the product at an index.
     * @dev Enumerable `[1, numProducts]`.
     * @param index Index to query.
     * @return prod The product address.
     */
    function product(uint256 index) external view override returns (address prod) {
        return _indexToProduct[index];
    }

    /**
     * @notice Returns a product's risk parameters.
     * The product must be active.
     * @param prod The product to get parameters for.
     * @return weight The weighted allocation of this product vs other products.
     * @return price The price in wei per 1e12 wei of coverage per block.
     * @return divisor The max cover amount divisor for per policy. (maxCover / divisor = maxCoverPerPolicy).
     */
    function productRiskParams(address prod) external view override returns (uint32 weight, uint24 price, uint16 divisor) {
        ProductRiskParams storage params = _productRiskParams[prod];
        require(params.weight > 0, "product inactive");
        return (params.weight, params.price, params.divisor);
    }

    /**
     * @notice Returns the sum of weights.
     * @return sum WeightSum.
     */
    function weightSum() external view override returns (uint32 sum) {
        return _weightSum;
    }

    /***************************************
    MIN CAPITAL VIEW FUNCTIONS
    ***************************************/

    /**
     * @notice The minimum amount of capital required to safely cover all policies.
     * @return mcr The minimum capital requirement.
     */
    function minCapitalRequirement() external view override returns (uint256 mcr) {
        return IPolicyManager(_registry.policyManager()).activeCoverAmount() * _partialReservesFactor / MAX_BPS;
    }

    /**
     * @notice Multiplier for minimum capital requirement.
     * @return factor Partial reserves factor in BPS.
     */
    function partialReservesFactor() external view override returns (uint16 factor) {
        return _partialReservesFactor;
    }

    /***************************************
    GOVERNANCE FUNCTIONS
    ***************************************/

    /**
     * @notice Adds a product.
     * If the product is already added, sets its parameters.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param product_ Address of the product.
     * @param weight_ The products weight.
     * @param price_ The products price in wei per 1e12 wei of coverage per block.
     * @param divisor_ The max cover amount divisor for per policy. (maxCover / divisor = maxCoverPerPolicy).
     */
    function addProduct(address product_, uint32 weight_, uint24 price_, uint16 divisor_) external override onlyGovernance {
        require(product_ != address(0x0), "zero address product");
        require(weight_ > 0, "no weight");
        require(price_ > 0, "no price");
        require(divisor_ > 0, "1/0");
        uint256 index = _productToIndex[product_];
        if(index == 0) {
            // add new product
            uint32 weightSum_ = (_productCount == 0)
              ? weight_ // first product
              : (_weightSum + weight_);
            _weightSum = weightSum_;
            _productRiskParams[product_] = ProductRiskParams({
                weight: weight_,
                price: price_,
                divisor: divisor_
            });
            index = ++_productCount;
            _productToIndex[product_] = index;
            _indexToProduct[index] = product_;
        } else {
            // change params of existing product
            uint32 prevWeight = _productRiskParams[product_].weight;
            uint32 weightSum_ = _weightSum - prevWeight + weight_;
            _weightSum = weightSum_;
            _productRiskParams[product_] = ProductRiskParams({
                weight: weight_,
                price: price_,
                divisor: divisor_
            });
        }
        emit ProductParamsSet(product_, weight_, price_, divisor_);
    }

    /**
     * @notice Removes a product.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param product_ Address of the product to remove.
     */
    function removeProduct(address product_) external override onlyGovernance {
        uint256 index = _productToIndex[product_];
        // product wasn't added to begin with
        if(index == 0) return;
        // if not at the end copy down
        uint256 lastIndex = _productCount;
        if(index != lastIndex) {
            address lastProduct = _indexToProduct[lastIndex];
            _productToIndex[lastProduct] = index;
            _indexToProduct[index] = lastProduct;
        }
        // pop end of array
        delete _productToIndex[product_];
        delete _indexToProduct[lastIndex];
        uint256 newProductCount = _productCount - 1;
        _weightSum = (newProductCount == 0)
          ? type(uint32).max // no div by zero
          : (_weightSum - _productRiskParams[product_].weight);
        _productCount = newProductCount;
        delete _productRiskParams[product_];
        emit ProductParamsSet(product_, 0, 0, 0);
    }

    /**
     * @notice Sets the products and their parameters.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param products_ The products.
     * @param weights_ The product weights.
     * @param prices_ The product prices.
     * @param divisors_ The max cover per policy divisors.
     */
    function setProductParams(address[] calldata products_, uint32[] calldata weights_, uint24[] calldata prices_, uint16[] calldata divisors_) external override onlyGovernance {
        // check array lengths
        uint256 length = products_.length;
        require(length == weights_.length && length == prices_.length && length == divisors_.length, "length mismatch");
        // delete old products
        for(uint256 index = _productCount; index > 0; index--) {
            address product_ = _indexToProduct[index];
            delete _productToIndex[product_];
            delete _indexToProduct[index];
            delete _productRiskParams[product_];
            emit ProductParamsSet(product_, 0, 0, 0);
        }
        // add new products
        uint32 weightSum_ = 0;
        for(uint256 i = 0; i < length; i++) {
            address product_ = products_[i];
            uint32 weight_ = weights_[i];
            uint24 price_ = prices_[i];
            uint16 divisor_ = divisors_[i];
            require(product_ != address(0x0), "zero address product");
            require(weight_ > 0, "no weight");
            require(price_ > 0, "no price");
            require(divisor_ > 0, "1/0");
            require(_productToIndex[product_] == 0, "duplicate product");
            _productRiskParams[product_] = ProductRiskParams({
                weight: weight_,
                price: price_,
                divisor: divisor_
            });
            weightSum_ += weight_;
            _productToIndex[product_] = i+1;
            _indexToProduct[i+1] = product_;
            emit ProductParamsSet(product_, weight_, price_, divisor_);
        }
        _weightSum = (length == 0)
          ? type(uint32).max // no div by zero
          : weightSum_;
        _productCount = length;
    }

    /**
     * @notice Sets the partial reserves factor.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param partialReservesFactor_ New partial reserves factor in BPS.
     */
    function setPartialReservesFactor(uint16 partialReservesFactor_) external override onlyGovernance {
        _partialReservesFactor = partialReservesFactor_;
        emit PartialReservesFactorSet(partialReservesFactor_);
    }
}

// File: contracts/Governable.sol



// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.6;

import "./interface/IGovernable.sol";

/**
 * @title Governable
 * @author solace.fi
 * @notice Enforces access control for important functions to [**governor**](/docs/protocol/governance).
 *
 * Many contracts contain functionality that should only be accessible to a privileged user. The most common access control pattern is [OpenZeppelin's `Ownable`](https://docs.openzeppelin.com/contracts/4.x/access-control#ownership-and-ownable). We instead use `Governable` with a few key differences:
   * - Transferring the governance role is a two step process. The current governance must [`setPendingGovernance(pendingGovernance_)`](#setPendingGovernance) then the new governance must [`acceptGovernance()`](#acceptgovernance). This is to safeguard against accidentally setting ownership to the wrong address and locking yourself out of your contract.
 * - `governance` is a constructor argument instead of `msg.sender`. This is especially useful when deploying contracts via a [`SingletonFactory`](./interface/ISingletonFactory).
 * - We use `lockGovernance()` instead of `renounceOwnership()`. `renounceOwnership()` is a prerequisite for the reinitialization bug because it sets `owner = address(0x0)`. We also use the `governanceIsLocked()` flag.
 */
contract Governable is IGovernable {

    /***************************************
    GLOBAL VARIABLES
    ***************************************/

    // Governor.
    address private _governance;

    // governance to take over.
    address private _pendingGovernance;

    bool private _locked;

    /**
     * @notice Constructs the governable contract.
     * @param governance_ The address of the [governor](/docs/protocol/governance).
     */
    constructor(address governance_) {
        require(governance_ != address(0x0), "zero address governance");
        _governance = governance_;
        _pendingGovernance = address(0x0);
        _locked = false;
    }

    /***************************************
    MODIFIERS
    ***************************************/

    // can only be called by governor
    // can only be called while unlocked
    modifier onlyGovernance() {
        require(!_locked, "governance locked");
        require(msg.sender == _governance, "!governance");
        _;
    }

    // can only be called by pending governor
    // can only be called while unlocked
    modifier onlyPendingGovernance() {
        require(!_locked, "governance locked");
        require(msg.sender == _pendingGovernance, "!pending governance");
        _;
    }

    /***************************************
    VIEW FUNCTIONS
    ***************************************/

    /// @notice Address of the current governor.
    function governance() external view override returns (address) {
        return _governance;
    }

    /// @notice Address of the governor to take over.
    function pendingGovernance() external view override returns (address) {
        return _pendingGovernance;
    }

    /// @notice Returns true if governance is locked.
    function governanceIsLocked() external view override returns (bool) {
        return _locked;
    }

    /***************************************
    MUTATOR FUNCTIONS
    ***************************************/

    /**
     * @notice Initiates transfer of the governance role to a new governor.
     * Transfer is not complete until the new governor accepts the role.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param pendingGovernance_ The new governor.
     */
    function setPendingGovernance(address pendingGovernance_) external override onlyGovernance {
        _pendingGovernance = pendingGovernance_;
        emit GovernancePending(pendingGovernance_);
    }

    /**
     * @notice Accepts the governance role.
     * Can only be called by the pending governor.
     */
    function acceptGovernance() external override onlyPendingGovernance {
        // sanity check against transferring governance to the zero address
        // if someone figures out how to sign transactions from the zero address
        // consider the entirety of ethereum to be rekt
        require(_pendingGovernance != address(0x0), "zero governance");
        address oldGovernance = _governance;
        _governance = _pendingGovernance;
        _pendingGovernance = address(0x0);
        emit GovernanceTransferred(oldGovernance, _governance);
    }

    /**
     * @notice Permanently locks this contract's governance role and any of its functions that require the role.
     * This action cannot be reversed.
     * Before you call it, ask yourself:
     *   - Is the contract self-sustaining?
     *   - Is there a chance you will need governance privileges in the future?
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     */
    function lockGovernance() external override onlyGovernance {
        _locked = true;
        // intentionally not using address(0x0), see re-initialization exploit
        _governance = address(0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF);
        _pendingGovernance = address(0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF);
        emit GovernanceTransferred(msg.sender, address(0xFFfFfFffFFfffFFfFFfFFFFFffFFFffffFfFFFfF));
        emit GovernanceLocked();
    }
}

// File: contracts/interface/IVault.sol



// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.6;

import "./IWETH9.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol";

/**
 * @title IVault
 * @author solace.fi
 * @notice The risk-backing capital pool.
 *
 * [**Capital Providers**](/docs/user-guides/capital-provider/cp-role-guide) can deposit **ETH** or **WETH** into the `Vault` to mint shares. Shares are represented as **CP tokens** aka **SCP** and extend `ERC20`. [**Capital Providers**](/docs/user-guides/capital-provider/cp-role-guide) should use [`depositEth()`](#depositeth) or [`depositWeth()`](#depositweth), not regular **ETH** or **WETH** transfer.
 *
 * As [**Policyholders**](/docs/protocol/policy-holder) purchase coverage, premiums will flow into the capital pool and are split amongst the [**Capital Providers**](/docs/user-guides/capital-provider/cp-role-guide). If a loss event occurs in an active policy, some funds will be used to payout the claim. These events will affect the price per share but not the number or distribution of shares.
 *
 * By minting shares of the `Vault`, [**Capital Providers**](/docs/user-guides/capital-provider/cp-role-guide) willingly accept the risk that the whole or a part of their funds may be used payout claims. A malicious [**Capital Providers**](/docs/user-guides/capital-provider/cp-role-guide) could detect a loss event and try to withdraw their funds before claims are paid out. To prevent this, the `Vault` uses a cooldown mechanic such that while the [**capital provider**](/docs/user-guides/capital-provider/cp-role-guide) is not in cooldown mode (default) they can mint, send, and receive **SCP** but not withdraw **ETH**. To withdraw their **ETH**, the [**capital provider**](/docs/user-guides/capital-provider/cp-role-guide) must `startCooldown()`(#startcooldown), wait no less than `cooldownMin()`(#cooldownmin) and no more than `cooldownMax()`(#cooldownmax), then call `withdrawEth()`(#withdraweth) or `withdrawWeth()`(#withdrawweth). While in cooldown mode users cannot send or receive **SCP** and minting shares will take them out of cooldown.
 */
interface IVault is IERC20Metadata, IERC20Permit {

    /***************************************
    EVENTS
    ***************************************/

    /// @notice Emitted when a user deposits funds.
    event DepositMade(address indexed depositor, uint256 indexed amount, uint256 indexed shares);
    /// @notice Emitted when a user withdraws funds.
    event WithdrawalMade(address indexed withdrawer, uint256 indexed value);
    /// @notice Emitted when funds are sent to a requestor.
    event FundsSent(uint256 value);
    /// @notice Emitted when deposits are paused.
    event Paused();
    /// @notice Emitted when deposits are unpaused.
    event Unpaused();
    /// @notice Emitted when a user enters cooldown mode.
    event CooldownStarted(address user);
    /// @notice Emitted when a user leaves cooldown mode.
    event CooldownStopped(address user);
    /// @notice Emitted when the cooldown window is set.
    event CooldownWindowSet(uint40 cooldownMin, uint40 cooldownMax);
    /// @notice Emitted when a requestor is added.
    event RequestorAdded(address requestor);
    /// @notice Emitted when a requestor is removed.
    event RequestorRemoved(address requestor);

    /***************************************
    CAPITAL PROVIDER FUNCTIONS
    ***************************************/

    /**
     * @notice Allows a user to deposit **ETH** into the `Vault`(becoming a **Capital Provider**).
     * Shares of the `Vault` (CP tokens) are minted to caller.
     * It is called when `Vault` receives **ETH**.
     * It issues the amount of token share respected to the deposit to the `recipient`.
     * Reverts if `Vault` is paused.
     * @return shares The number of shares minted.
     */
    function depositEth() external payable returns (uint256 shares);

    /**
     * @notice Allows a user to deposit **WETH** into the `Vault`(becoming a **Capital Provider**).
     * Shares of the Vault (CP tokens) are minted to caller.
     * It issues the amount of token share respected to the deposit to the `recipient`.
     * Reverts if `Vault` is paused.
     * @param amount Amount of weth to deposit.
     * @return shares The number of shares minted.
     */
    function depositWeth(uint256 amount) external returns (uint256);

    /**
     * @notice Starts the cooldown.
     */
    function startCooldown() external;

    /**
     * @notice Stops the cooldown.
     */
    function stopCooldown() external;

    /**
     * @notice Allows a user to redeem shares for **ETH**.
     * Burns **SCP** and transfers **ETH** to the [**Capital Provider**](/docs/user-guides/capital-provider/cp-role-guide).
     * @param shares Amount of shares to redeem.
     * @return value The amount in **ETH** that the shares where redeemed for.
     */
    function withdrawEth(uint256 shares) external returns (uint256 value);

    /**
     * @notice Allows a user to redeem shares for **WETH**.
     * Burns **SCP** tokens and transfers **WETH** to the [**Capital Provider**](/docs/user-guides/capital-provider/cp-role-guide).
     * @param shares amount of shares to redeem.
     * @return value The amount in **WETH** that the shares where redeemed for.
     */
    function withdrawWeth(uint256 shares) external returns (uint256 value);

    /***************************************
    CAPITAL PROVIDER VIEW FUNCTIONS
    ***************************************/

    /**
     * @notice The price of one **SCP**.
     * @return price The price in **ETH**.
     */
    function pricePerShare() external view returns (uint256 price);

    /**
     * @notice Returns the maximum redeemable shares by the `user` such that `Vault` does not go under **MCR**(Minimum Capital Requirement). May be less than their balance.
     * @param user The address of user to check.
     * @return shares The max redeemable shares by the user.
     */
    function maxRedeemableShares(address user) external view returns (uint256 shares);

    /**
     * @notice Returns the total quantity of all assets held by the `Vault`.
     * @return assets The total assets under control of this vault.
    */
    function totalAssets() external view returns (uint256 assets);

    /// @notice The minimum amount of time a user must wait to withdraw funds.
    function cooldownMin() external view returns (uint40);

    /// @notice The maximum amount of time a user must wait to withdraw funds.
    function cooldownMax() external view returns (uint40);

    /**
     * @notice The timestamp that a depositor's cooldown started.
     * @param user The depositor.
     * @return start The timestamp in seconds.
     */
    function cooldownStart(address user) external view returns (uint40 start);

    /**
     * @notice Returns true if the user is allowed to receive or send vault shares.
     * @param user User to query.
     * return status True if can transfer.
     */
    function canTransfer(address user) external view returns (bool status);

    /**
     * @notice Returns true if the user is allowed to withdraw vault shares.
     * @param user User to query.
     * return status True if can withdraw.
     */
    function canWithdraw(address user) external view returns (bool status);

    /// @notice Returns true if the vault is paused.
    function paused() external view returns (bool paused_);

    /***************************************
    REQUESTOR FUNCTIONS
    ***************************************/

    /**
     * @notice Sends **ETH** to other users or contracts.
     * Can only be called by authorized requestors.
     * @param amount Amount of **ETH** wanted.
     */
    function requestEth(uint256 amount) external;

    /**
     * @notice Returns true if the destination is authorized to request **ETH**.
     * @param dst Account to check requestability.
     * @return status True if requestor, false if not.
     */
    function isRequestor(address dst) external view returns (bool status);

    /***************************************
    GOVERNANCE FUNCTIONS
    ***************************************/

    /**
     * @notice Pauses deposits.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * While paused:
     * 1. No users may deposit into the Vault.
     * 2. Withdrawls can bypass cooldown.
     * 3. Only Governance may unpause.
    */
    function pause() external;

    /**
     * @notice Unpauses deposits.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
    */
    function unpause() external;

    /**
     * @notice Sets the `minimum` and `maximum` amount of time in seconds that a user must wait to withdraw funds.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param cooldownMin_ Minimum time in seconds.
     * @param cooldownMax_ Maximum time in seconds.
     */
    function setCooldownWindow(uint40 cooldownMin_, uint40 cooldownMax_) external;

    /**
     * @notice Adds requesting rights.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param requestor The requestor to grant rights.
     */
    function addRequestor(address requestor) external;

    /**
     * @notice Removes requesting rights.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param requestor The requestor to revoke rights.
     */
    function removeRequestor(address requestor) external;

    /***************************************
    FALLBACK FUNCTIONS
    ***************************************/

    /**
     * @notice Fallback function to allow contract to receive *ETH*.
     * Does _not_ mint shares.
     */
    receive () external payable;

    /**
     * @notice Fallback function to allow contract to receive **ETH**.
     * Does _not_ mint shares.
     */
    fallback () external payable;
}

// File: contracts/interface/IRegistry.sol



// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.6;

/**
 * @title IRegistry
 * @author solace.fi
 * @notice Tracks the contracts of the Solaverse.
 *
 * [**Governance**](/docs/protocol/governance) can set the contract addresses and anyone can look them up.
 *
 * Note that `Registry` doesn't track all Solace contracts. FarmController is tracked in [`OptionsFarming`](../OptionsFarming), farms are tracked in FarmController, Products are tracked in [`PolicyManager`](../PolicyManager), and the `Registry` is untracked.
 */
interface IRegistry {

    /***************************************
    EVENTS
    ***************************************/

    // Emitted when WETH is set.
    event WethSet(address weth);
    // Emitted when Vault is set.
    event VaultSet(address vault);
    // Emitted when ClaimsEscrow is set.
    event ClaimsEscrowSet(address claimsEscrow);
    // Emitted when Treasury is set.
    event TreasurySet(address treasury);
    // Emitted when PolicyManager is set.
    event PolicyManagerSet(address policyManager);
    // Emitted when RiskManager is set.
    event RiskManagerSet(address riskManager);
    // Emitted when Solace Token is set.
    event SolaceSet(address solace);
    // Emitted when OptionsFarming is set.
    event OptionsFarmingSet(address optionsFarming);
    // Emitted when FarmController is set.
    event FarmControllerSet(address farmController);
    // Emitted when Locker is set.
    event LockerSet(address locker);

    /***************************************
    VIEW FUNCTIONS
    ***************************************/

    /**
     * @notice Gets the [**WETH**](../WETH9) contract.
     * @return weth_ The address of the [**WETH**](../WETH9) contract.
     */
    function weth() external view returns (address weth_);

    /**
     * @notice Gets the [`Vault`](../Vault) contract.
     * @return vault_ The address of the [`Vault`](../Vault) contract.
     */
    function vault() external view returns (address vault_);

    /**
     * @notice Gets the [`ClaimsEscrow`](../ClaimsEscrow) contract.
     * @return claimsEscrow_ The address of the [`ClaimsEscrow`](../ClaimsEscrow) contract.
     */
    function claimsEscrow() external view returns (address claimsEscrow_);

    /**
     * @notice Gets the [`Treasury`](../Treasury) contract.
     * @return treasury_ The address of the [`Treasury`](../Treasury) contract.
     */
    function treasury() external view returns (address treasury_);

    /**
     * @notice Gets the [`PolicyManager`](../PolicyManager) contract.
     * @return policyManager_ The address of the [`PolicyManager`](../PolicyManager) contract.
     */
    function policyManager() external view returns (address policyManager_);

    /**
     * @notice Gets the [`RiskManager`](../RiskManager) contract.
     * @return riskManager_ The address of the [`RiskManager`](../RiskManager) contract.
     */
    function riskManager() external view returns (address riskManager_);

    /**
     * @notice Gets the [**SOLACE**](../SOLACE) contract.
     * @return solace_ The address of the [**SOLACE**](../SOLACE) contract.
     */
    function solace() external view returns (address solace_);

    /**
     * @notice Gets the [`OptionsFarming`](../OptionsFarming) contract.
     * @return optionsFarming_ The address of the [`OptionsFarming`](../OptionsFarming) contract.
     */
    function optionsFarming() external view returns (address optionsFarming_);

    /**
     * @notice Gets the [`FarmController`](../FarmController) contract.
     * @return farmController_ The address of the [`FarmController`](../FarmController) contract.
     */
    function farmController() external view returns (address farmController_);

    /**
     * @notice Gets the [`Locker`](../Locker) contract.
     * @return locker_ The address of the [`Locker`](../Locker) contract.
     */
    function locker() external view returns (address locker_);

    /***************************************
    GOVERNANCE FUNCTIONS
    ***************************************/

    /**
     * @notice Sets the [**WETH**](../WETH9) contract.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param weth_ The address of the [**WETH**](../WETH9) contract.
     */
    function setWeth(address weth_) external;

    /**
     * @notice Sets the [`Vault`](../Vault) contract.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param vault_ The address of the [`Vault`](../Vault) contract.
     */
    function setVault(address vault_) external;

    /**
     * @notice Sets the [`Claims Escrow`](../ClaimsEscrow) contract.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param claimsEscrow_ The address of the [`Claims Escrow`](../ClaimsEscrow) contract.
     */
    function setClaimsEscrow(address claimsEscrow_) external;

    /**
     * @notice Sets the [`Treasury`](../Treasury) contract.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param treasury_ The address of the [`Treasury`](../Treasury) contract.
     */
    function setTreasury(address treasury_) external;

    /**
     * @notice Sets the [`Policy Manager`](../PolicyManager) contract.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param policyManager_ The address of the [`Policy Manager`](../PolicyManager) contract.
     */
    function setPolicyManager(address policyManager_) external;

    /**
     * @notice Sets the [`Risk Manager`](../RiskManager) contract.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param riskManager_ The address of the [`Risk Manager`](../RiskManager) contract.
     */
    function setRiskManager(address riskManager_) external;

    /**
     * @notice Sets the [**SOLACE**](../SOLACE) contract.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param solace_ The address of the [**SOLACE**](../SOLACE) contract.
     */
    function setSolace(address solace_) external;

    /**
     * @notice Sets the [`OptionsFarming`](../OptionsFarming) contract.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param optionsFarming_ The address of the [`OptionsFarming`](../OptionsFarming) contract.
     */
    function setOptionsFarming(address optionsFarming_) external;

    /**
     * @notice Sets the [`FarmController`](../FarmController) contract.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param farmController_ The address of the [`FarmController`](../FarmController) contract.
     */
    function setFarmController(address farmController_) external;

    /**
     * @notice Sets the [`Locker`](../Locker) contract.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param locker_ The address of the [`Locker`](../Locker) contract.
     */
    function setLocker(address locker_) external;

    /**
     * @notice Sets multiple contracts in one call.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param weth_ The address of the [**WETH**](../WETH9) contract.
     * @param vault_ The address of the [`Vault`](../Vault) contract.
     * @param claimsEscrow_ The address of the [`Claims Escrow`](../ClaimsEscrow) contract.
     * @param treasury_ The address of the [`Treasury`](../Treasury) contract.
     * @param policyManager_ The address of the [`Policy Manager`](../PolicyManager) contract.
     * @param riskManager_ The address of the [`Risk Manager`](../RiskManager) contract.
     * @param solace_ The address of the [**SOLACE**](../SOLACE) contract.
     * @param optionsFarming_ The address of the [`OptionsFarming`](./OptionsFarming) contract.
     * @param farmController_ The address of the [`FarmController`](./FarmController) contract.
     * @param locker_ The address of the [`Locker`](../Locker) contract.
     */
    function setMultiple(
        address weth_,
        address vault_,
        address claimsEscrow_,
        address treasury_,
        address policyManager_,
        address riskManager_,
        address solace_,
        address optionsFarming_,
        address farmController_,
        address locker_
    ) external;
}

// File: contracts/interface/IProduct.sol



// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.6;

/**
 * @title IProduct
 * @author solace.fi
 * @notice Interface for product contracts
 */
interface IProduct {

    /***************************************
    EVENTS
    ***************************************/

    /// @notice Emitted when a policy is created.
    event PolicyCreated(uint256 indexed policyID);
    /// @notice Emitted when a policy is extended.
    event PolicyExtended(uint256 indexed policyID);
    /// @notice Emitted when a policy is canceled.
    event PolicyCanceled(uint256 indexed policyID);
    /// @notice Emitted when a policy is updated.
    event PolicyUpdated(uint256 indexed policyID);
    /// @notice Emitted when a claim is submitted.
    event ClaimSubmitted(uint256 indexed policyID);
    /// @notice Emitted when min period is set.
    event MinPeriodSet(uint40 minPeriod);
    /// @notice Emitted when max period is set.
    event MaxPeriodSet(uint40 maxPeriod);
    /// @notice Emitted when buying is paused or unpaused.
    event PauseSet(bool paused);
    /// @notice Emitted when covered platform is set.
    event CoveredPlatformSet(address coveredPlatform);
    /// @notice Emitted when PolicyManager is set.
    event PolicyManagerSet(address policyManager);

    /***************************************
    POLICYHOLDER FUNCTIONS
    ***************************************/

    /**
     * @notice Purchases and mints a policy on the behalf of the policyholder.
     * User will need to pay **ETH**.
     * @param policyholder Holder of the position(s) to cover.
     * @param coverAmount The value to cover in **ETH**.
     * @param blocks The length (in blocks) for policy.
     * @param positionDescription A byte encoded description of the position(s) to cover.
     * @return policyID The ID of newly created policy.
     */
    function buyPolicy(address policyholder, uint256 coverAmount, uint40 blocks, bytes memory positionDescription) external payable returns (uint256 policyID);

    /**
     * @notice Increase or decrease the cover amount of the policy.
     * User may need to pay **ETH** for increased cover amount or receive a refund for decreased cover amount.
     * Can only be called by the policyholder.
     * @param policyID The ID of the policy.
     * @param newCoverAmount The new value to cover in **ETH**.
     */
    function updateCoverAmount(uint256 policyID, uint256 newCoverAmount) external payable;

    /**
     * @notice Extend a policy.
     * User will need to pay **ETH**.
     * Can only be called by the policyholder.
     * @param policyID The ID of the policy.
     * @param extension The length of extension in blocks.
     */
    function extendPolicy(uint256 policyID, uint40 extension) external payable;

    /**
     * @notice Extend a policy and update its cover amount.
     * User may need to pay **ETH** for increased cover amount or receive a refund for decreased cover amount.
     * Can only be called by the policyholder.
     * @param policyID The ID of the policy.
     * @param newCoverAmount The new value to cover in **ETH**.
     * @param extension The length of extension in blocks.
     */
    function updatePolicy(uint256 policyID, uint256 newCoverAmount, uint40 extension) external payable;

    /**
     * @notice Cancel and burn a policy.
     * User will receive a refund for the remaining blocks.
     * Can only be called by the policyholder.
     * @param policyID The ID of the policy.
     */
    function cancelPolicy(uint256 policyID) external;

    /***************************************
    QUOTE VIEW FUNCTIONS
    ***************************************/

    /**
     * @notice Calculate a premium quote for a policy.
     * @param coverAmount The value to cover in **ETH**.
     * @param blocks The duration of the policy in blocks.
     * @return premium The quote for their policy in **ETH**.
     */
    function getQuote(uint256 coverAmount, uint40 blocks) external view returns (uint256 premium);

    /***************************************
    GLOBAL VIEW FUNCTIONS
    ***************************************/

    /// @notice The minimum policy period in blocks.
    function minPeriod() external view returns (uint40);
    /// @notice The maximum policy period in blocks.
    function maxPeriod() external view returns (uint40);
    /// @notice Covered platform.
    /// A platform contract which locates contracts that are covered by this product.
    /// (e.g., `UniswapProduct` will have `Factory` as `coveredPlatform` contract, because every `Pair` address can be located through `getPool()` function).
    function coveredPlatform() external view returns (address);
    /// @notice The current amount covered (in wei).
    function activeCoverAmount() external view returns (uint256);

    /**
     * @notice Returns the name of the product.
     * Must be implemented by child contracts.
     * @return productName The name of the product.
     */
    function name() external view returns (string memory productName);

    /// @notice Cannot buy new policies while paused. (Default is False)
    function paused() external view returns (bool);

    /// @notice Address of the [`PolicyManager`](../PolicyManager).
    function policyManager() external view returns (address);

    /**
     * @notice Returns true if the given account is authorized to sign claims.
     * @param account Potential signer to query.
     * @return status True if is authorized signer.
     */
     function isAuthorizedSigner(address account) external view returns (bool status);

    /***************************************
    MUTATOR FUNCTIONS
    ***************************************/

    /**
     * @notice Updates the product's book-keeping variables.
     * Can only be called by the [`PolicyManager`](../PolicyManager).
     * @param coverDiff The change in active cover amount.
     */
    function updateActiveCoverAmount(int256 coverDiff) external;

    /***************************************
    GOVERNANCE FUNCTIONS
    ***************************************/

    /**
     * @notice Sets the minimum number of blocks a policy can be purchased for.
     * @param minPeriod_ The minimum number of blocks.
     */
    function setMinPeriod(uint40 minPeriod_) external;

    /**
     * @notice Sets the maximum number of blocks a policy can be purchased for.
     * @param maxPeriod_ The maximum number of blocks
     */
    function setMaxPeriod(uint40 maxPeriod_) external;

    /**
     * @notice Changes the covered platform.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @dev Use this if the the protocol changes their registry but keeps the children contracts.
     * A new version of the protocol will likely require a new Product.
     * @param coveredPlatform_ The platform to cover.
     */
    function setCoveredPlatform(address coveredPlatform_) external;

    /**
     * @notice Changes the policy manager.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param policyManager_ The new policy manager.
     */
    function setPolicyManager(address policyManager_) external;
}

// File: contracts/interface/IPolicyManager.sol



// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.6;

import "./IERC721Enhanced.sol";

/**
 * @title IPolicyManager
 * @author solace.fi
 * @notice The **PolicyManager** manages the creation of new policies and modification of existing policies.
 *
 * Most users will not interact with **PolicyManager** directly. To buy, modify, or cancel policies, users should use the respective [**product**](../products/BaseProduct) for the position they would like to cover. Use **PolicyManager** to view policies.
 *
 * Policies are [**ERC721s**](https://docs.openzeppelin.com/contracts/4.x/api/token/erc721#ERC721).
 */
interface IPolicyManager is IERC721Enhanced {

    /***************************************
    EVENTS
    ***************************************/

    /// @notice Emitted when a policy is created.
    event PolicyCreated(uint256 policyID);
    /// @notice Emitted when a policy is updated.
    event PolicyUpdated(uint256 indexed policyID);
    /// @notice Emitted when a policy is burned.
    event PolicyBurned(uint256 policyID);
    /// @notice Emitted when the policy descriptor is set.
    event PolicyDescriptorSet(address policyDescriptor);
    /// @notice Emitted when a new product is added.
    event ProductAdded(address product);
    /// @notice Emitted when a new product is removed.
    event ProductRemoved(address product);

    /***************************************
    POLICY VIEW FUNCTIONS
    ***************************************/

    /// @notice PolicyInfo struct.
    struct PolicyInfo {
        uint256 coverAmount;
        address product;
        uint40 expirationBlock;
        uint24 price;
        bytes positionDescription;
    }

    /**
     * @notice Information about a policy.
     * @param policyID The policy ID to return info.
     * @return info info in a struct.
     */
    function policyInfo(uint256 policyID) external view returns (PolicyInfo memory info);

    /**
     * @notice Information about a policy.
     * @param policyID The policy ID to return info.
     * @return policyholder The address of the policy holder.
     * @return product The product of the policy.
     * @return coverAmount The amount covered for the policy.
     * @return expirationBlock The expiration block of the policy.
     * @return price The price of the policy.
     * @return positionDescription The description of the covered position(s).
     */
    function getPolicyInfo(uint256 policyID) external view returns (address policyholder, address product, uint256 coverAmount, uint40 expirationBlock, uint24 price, bytes calldata positionDescription);

    /**
     * @notice The holder of the policy.
     * @param policyID The policy ID.
     * @return policyholder The address of the policy holder.
     */
    function getPolicyholder(uint256 policyID) external view returns (address policyholder);

    /**
     * @notice The product used to purchase the policy.
     * @param policyID The policy ID.
     * @return product The product of the policy.
     */
    function getPolicyProduct(uint256 policyID) external view returns (address product);

    /**
     * @notice The expiration block of the policy.
     * @param policyID The policy ID.
     * @return expirationBlock The expiration block of the policy.
     */
    function getPolicyExpirationBlock(uint256 policyID) external view returns (uint40 expirationBlock);

    /**
     * @notice The cover amount of the policy.
     * @param policyID The policy ID.
     * @return coverAmount The cover amount of the policy.
     */
    function getPolicyCoverAmount(uint256 policyID) external view returns (uint256 coverAmount);

    /**
     * @notice The cover price in wei per block per wei multiplied by 1e12.
     * @param policyID The policy ID.
     * @return price The price of the policy.
     */
    function getPolicyPrice(uint256 policyID) external view returns (uint24 price);

    /**
     * @notice The byte encoded description of the covered position(s).
     * Only makes sense in context of the product.
     * @param policyID The policy ID.
     * @return positionDescription The description of the covered position(s).
     */
    function getPositionDescription(uint256 policyID) external view returns (bytes calldata positionDescription);

    /*
     * @notice These functions can be used to check a policys stage in the lifecycle.
     * There are three major lifecycle events:
     *   1 - policy is bought (aka minted)
     *   2 - policy expires
     *   3 - policy is burnt (aka deleted)
     * There are four stages:
     *   A - pre-mint
     *   B - pre-expiration
     *   C - post-expiration
     *   D - post-burn
     * Truth table:
     *               A B C D
     *   exists      0 1 1 0
     *   isActive    0 1 0 0
     *   hasExpired  0 0 1 0

    /**
     * @notice Checks if a policy is active.
     * @param policyID The policy ID.
     * @return status True if the policy is active.
     */
    function policyIsActive(uint256 policyID) external view returns (bool);

    /**
     * @notice Checks whether a given policy is expired.
     * @param policyID The policy ID.
     * @return status True if the policy is expired.
     */
    function policyHasExpired(uint256 policyID) external view returns (bool);

    /// @notice The total number of policies ever created.
    function totalPolicyCount() external view returns (uint256 count);

    /// @notice The address of the [`PolicyDescriptor`](./PolicyDescriptor) contract.
    function policyDescriptor() external view returns (address);

    /***************************************
    POLICY MUTATIVE FUNCTIONS
    ***************************************/

    /**
     * @notice Creates a new policy.
     * Can only be called by **products**.
     * @param policyholder The receiver of new policy token.
     * @param coverAmount The policy coverage amount (in wei).
     * @param expirationBlock The policy expiration block number.
     * @param price The coverage price.
     * @param positionDescription The description of the covered position(s).
     * @return policyID The policy ID.
     */
    function createPolicy(
        address policyholder,
        uint256 coverAmount,
        uint40 expirationBlock,
        uint24 price,
        bytes calldata positionDescription
    ) external returns (uint256 policyID);

    /**
     * @notice Modifies a policy.
     * Can only be called by **products**.
     * @param policyID The policy ID.
     * @param coverAmount The policy coverage amount (in wei).
     * @param expirationBlock The policy expiration block number.
     * @param price The coverage price.
     * @param positionDescription The description of the covered position(s).
     */
    function setPolicyInfo(uint256 policyID, uint256 coverAmount, uint40 expirationBlock, uint24 price, bytes calldata positionDescription) external;

    /**
     * @notice Burns expired or cancelled policies.
     * Can only be called by **products**.
     * @param policyID The ID of the policy to burn.
     */
    function burn(uint256 policyID) external;

    /**
     * @notice Burns expired policies.
     * @param policyIDs The list of expired policies.
     */
    function updateActivePolicies(uint256[] calldata policyIDs) external;

    /***************************************
    PRODUCT VIEW FUNCTIONS
    ***************************************/

    /**
     * @notice Checks is an address is an active product.
     * @param product The product to check.
     * @return status True if the product is active.
     */
    function productIsActive(address product) external view returns (bool status);

    /**
     * @notice Returns the number of products.
     * @return count The number of products.
     */
    function numProducts() external view returns (uint256 count);

    /**
     * @notice Returns the product at the given index.
     * @param productNum The index to query.
     * @return product The address of the product.
     */
    function getProduct(uint256 productNum) external view returns (address product);

    /***************************************
    OTHER VIEW FUNCTIONS
    ***************************************/

    function activeCoverAmount() external view returns (uint256);

    /***************************************
    GOVERNANCE FUNCTIONS
    ***************************************/

    /**
     * @notice Adds a new product.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param product the new product
     */
    function addProduct(address product) external;

    /**
     * @notice Removes a product.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param product the product to remove
     */
    function removeProduct(address product) external;


    /**
     * @notice Set the token descriptor.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param policyDescriptor The new token descriptor address.
     */
    function setPolicyDescriptor(address policyDescriptor) external;
}

// File: contracts/interface/IRiskManager.sol



// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.6;


/**
 * @title IRiskManager
 * @author solace.fi
 * @notice Calculates the acceptable risk, sellable cover, and capital requirements of Solace products and capital pool.
 *
 * The total amount of sellable coverage is proportional to the assets in the [**risk backing capital pool**](../Vault). The max cover is split amongst products in a weighting system. [**Governance**](/docs/protocol/governance). can change these weights and with it each product's sellable cover.
 *
 * The minimum capital requirement is proportional to the amount of cover sold to [active policies](../PolicyManager).
 *
 * Solace can use leverage to sell more cover than the available capital. The amount of leverage is stored as [`partialReservesFactor`](#partialreservesfactor) and is settable by [**governance**](/docs/protocol/governance).
 */
interface IRiskManager {

    /***************************************
    EVENTS
    ***************************************/

    /// @notice Emitted when a product's risk parameters are set.
    /// Includes adding and removing products.
    event ProductParamsSet(address product, uint32 weight, uint24 price, uint16 divisor);
    /// @notice Emitted when the partial reserves factor is set.
    event PartialReservesFactorSet(uint16 partialReservesFactor);

    /***************************************
    MAX COVER VIEW FUNCTIONS
    ***************************************/

    /// @notice Struct for a product's risk parameters.
    struct ProductRiskParams {
        uint32 weight;  // The weighted allocation of this product vs other products.
        uint24 price;   // The price in wei per 1e12 wei of coverage per block.
        uint16 divisor; // The max cover per policy divisor. (maxCoverPerProduct / divisor = maxCoverPerPolicy)
    }

    /**
     * @notice Given a request for coverage, determines if that risk is acceptable and if so at what price.
     * @param product The product that wants to sell coverage.
     * @param currentCover If updating an existing policy's cover amount, the current cover amount, otherwise 0.
     * @param newCover The cover amount requested.
     * @return acceptable True if risk of the new cover is acceptable, false otherwise.
     * @return price The price in wei per 1e12 wei of coverage per block.
     */
    function assessRisk(address product, uint256 currentCover, uint256 newCover) external view returns (bool acceptable, uint24 price);

    /**
     * @notice The maximum amount of cover that Solace as a whole can sell.
     * @return cover The max amount of cover in wei.
     */
    function maxCover() external view returns (uint256 cover);

    /**
     * @notice The maximum amount of cover that a product can sell in total.
     * @param prod The product that wants to sell cover.
     * @return cover The max amount of cover in wei.
     */
    function maxCoverPerProduct(address prod) external view returns (uint256 cover);

    /**
     * @notice The amount of cover that a product can still sell.
     * @param prod The product that wants to sell cover.
     * @return cover The max amount of cover in wei.
     */
    function sellableCoverPerProduct(address prod) external view returns (uint256 cover);

    /**
     * @notice The maximum amount of cover that a product can sell in a single policy.
     * @param prod The product that wants to sell cover.
     * @return cover The max amount of cover in wei.
     */
    function maxCoverPerPolicy(address prod) external view returns (uint256 cover);

    /**
     * @notice Checks is an address is an active product.
     * @param prod The product to check.
     * @return status True if the product is active.
     */
    function productIsActive(address prod) external view returns (bool status);

    /**
     * @notice Return the number of registered products.
     * @return count Number of products.
     */
    function numProducts() external view returns (uint256 count);

    /**
     * @notice Return the product at an index.
     * @dev Enumerable `[1, numProducts]`.
     * @param index Index to query.
     * @return prod The product address.
     */
    function product(uint256 index) external view returns (address prod);

    /**
     * @notice Returns a product's risk parameters.
     * The product must be active.
     * @param prod The product to get parameters for.
     * @return weight The weighted allocation of this product vs other products.
     * @return price The price in wei per 1e12 wei of coverage per block.
     * @return divisor The max cover per policy divisor.
     */
    function productRiskParams(address prod) external view returns (uint32 weight, uint24 price, uint16 divisor);

    /**
     * @notice Returns the sum of weights.
     * @return sum WeightSum.
     */
    function weightSum() external view returns (uint32 sum);

    /***************************************
    MIN CAPITAL VIEW FUNCTIONS
    ***************************************/

    /**
     * @notice The minimum amount of capital required to safely cover all policies.
     * @return mcr The minimum capital requirement.
     */
    function minCapitalRequirement() external view returns (uint256 mcr);

    /**
     * @notice Multiplier for minimum capital requirement.
     * @return factor Partial reserves factor in BPS.
     */
    function partialReservesFactor() external view returns (uint16 factor);

    /***************************************
    GOVERNANCE FUNCTIONS
    ***************************************/

    /**
     * @notice Adds a product.
     * If the product is already added, sets its parameters.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param product_ Address of the product.
     * @param weight_ The products weight.
     * @param price_ The products price in wei per 1e12 wei of coverage per block.
     * @param divisor_ The max cover per policy divisor.
     */
    function addProduct(address product_, uint32 weight_, uint24 price_, uint16 divisor_) external;

    /**
     * @notice Removes a product.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param product_ Address of the product to remove.
     */
    function removeProduct(address product_) external;

    /**
     * @notice Sets the products and their parameters.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param products_ The products.
     * @param weights_ The product weights.
     * @param prices_ The product prices.
     * @param divisors_ The max cover per policy divisors.
     */
    function setProductParams(address[] calldata products_, uint32[] calldata weights_, uint24[] calldata prices_, uint16[] calldata divisors_) external;

    /**
     * @notice Sets the partial reserves factor.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param partialReservesFactor_ New partial reserves factor in BPS.
     */
    function setPartialReservesFactor(uint16 partialReservesFactor_) external;
}

// File: contracts/interface/IGovernable.sol



// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.8.6;

/**
 * @title IGovernable
 * @author solace.fi
 * @notice Enforces access control for important functions to [**governor**](/docs/protocol/governance).
 *
 * Many contracts contain functionality that should only be accessible to a privileged user. The most common access control pattern is [OpenZeppelin's `Ownable`](https://docs.openzeppelin.com/contracts/4.x/access-control#ownership-and-ownable). We instead use `Governable` with a few key differences:
 * - Transferring the governance role is a two step process. The current governance must [`setPendingGovernance(pendingGovernance_)`](#setPendingGovernance) then the new governance must [`acceptGovernance()`](#acceptgovernance). This is to safeguard against accidentally setting ownership to the wrong address and locking yourself out of your contract.
 * - `governance` is a constructor argument instead of `msg.sender`. This is especially useful when deploying contracts via a [`SingletonFactory`](./ISingletonFactory).
 * - We use `lockGovernance()` instead of `renounceOwnership()`. `renounceOwnership()` is a prerequisite for the reinitialization bug because it sets `owner = address(0x0)`. We also use the `governanceIsLocked()` flag.
 */
interface IGovernable {

    /***************************************
    EVENTS
    ***************************************/

    /// @notice Emitted when pending Governance is set.
    event GovernancePending(address pendingGovernance);
    /// @notice Emitted when Governance is set.
    event GovernanceTransferred(address oldGovernance, address newGovernance);
    /// @notice Emitted when Governance is locked.
    event GovernanceLocked();

    /***************************************
    VIEW FUNCTIONS
    ***************************************/

    /// @notice Address of the current governor.
    function governance() external view returns (address);

    /// @notice Address of the governor to take over.
    function pendingGovernance() external view returns (address);

    /// @notice Returns true if governance is locked.
    function governanceIsLocked() external view returns (bool);

    /***************************************
    MUTATORS
    ***************************************/

    /**
     * @notice Initiates transfer of the governance role to a new governor.
     * Transfer is not complete until the new governor accepts the role.
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     * @param pendingGovernance_ The new governor.
     */
    function setPendingGovernance(address pendingGovernance_) external;

    /**
     * @notice Accepts the governance role.
     * Can only be called by the new governor.
     */
    function acceptGovernance() external;

    /**
     * @notice Permanently locks this contract's governance role and any of its functions that require the role.
     * This action cannot be reversed.
     * Before you call it, ask yourself:
     *   - Is the contract self-sustaining?
     *   - Is there a chance you will need governance privileges in the future?
     * Can only be called by the current [**governor**](/docs/protocol/governance).
     */
    function lockGovernance() external;
}

// File: contracts/interface/IWETH9.sol



// SPDX-License-Identifier: NONE
// code borrowed from https://etherscan.io/address/0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2#code

// Copyright (C) 2015, 2016, 2017 Dapphub

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity 0.8.6;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";


/**
 * @title IWETH9
 * @author Dapphub
 * @notice [Wrapped Ether](https://weth.io/) smart contract. Extends **ERC20**.
 */
interface IWETH9 is IERC20Metadata {

    /// @notice Emitted when **ETH** is wrapped.
    event Deposit(address indexed dst, uint wad);
    /// @notice Emitted when **ETH** is unwrapped.
    event Withdrawal(address indexed src, uint wad);

    /**
     * @notice Wraps Ether. **WETH** will be minted to the sender at 1 **ETH** : 1 **WETH**.
     */
    receive() external payable;

    /**
     * @notice Wraps Ether. **WETH** will be minted to the sender at 1 **ETH** : 1 **WETH**.
     */
    fallback () external payable;

    /**
     * @notice Wraps Ether. **WETH** will be minted to the sender at 1 **ETH** : 1 **WETH**.
     */
    function deposit() external payable;

    /**
     * @notice Unwraps Ether. **ETH** will be returned to the sender at 1 **ETH** : 1 **WETH**.
     * @param wad Amount to unwrap.
     */
    function withdraw(uint wad) external;
}


/*
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  Nothing in this License shall be construed as excluding or limiting
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  12. No Surrender of Others' Freedom.

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  14. Revised Versions of this License.

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  Each version is given a distinguishing version number.  If the
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  If the Program specifies that a proxy can decide which future
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  15. Disclaimer of Warranty.

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  17. Interpretation of Sections 15 and 16.

  If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.

                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

Also add information on how to contact you by electronic and paper mail.

  If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:

    <program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".

  You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.

  The GNU General Public License does not permit incorporating your program
into proprietary programs.  If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library.  If this is what you want to do, use the GNU Lesser General
Public License instead of this License.  But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

*/

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol



// 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);
}

// File: @openzeppelin/contracts/token/ERC20/extensions/draft-IERC20Permit.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// 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);
}

// File: contracts/interface/IERC721Enhanced.sol



// SPDX-License-Identifier: GPL-3.0-or-later
// code borrowed from OpenZeppelin and @uniswap/v3-periphery
pragma solidity 0.8.6;

import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";

/**
 * @title ERC721Enhanced
 * @author solace.fi
 * @notice An extension of `ERC721`.
 *
 * The base is OpenZeppelin's `ERC721Enumerable` which also includes the `Metadata` extension. This extension includes simpler transfers, gasless approvals, and better enumeration.
 */
interface IERC721Enhanced is IERC721Enumerable {

    /***************************************
    SIMPLER TRANSFERS
    ***************************************/

    /**
     * @notice Transfers `tokenID` from `msg.sender` to `to`.
     * @dev This was excluded from the official `ERC721` standard in favor of `transferFrom(address from, address to, uint256 tokenID)`. We elect to include it.
     * @param to The receipient of the token.
     * @param tokenID The token to transfer.
     */
    function transfer(address to, uint256 tokenID) external;

    /**
     * @notice Safely transfers `tokenID` from `msg.sender` to `to`.
     * @dev This was excluded from the official `ERC721` standard in favor of `safeTransferFrom(address from, address to, uint256 tokenID)`. We elect to include it.
     * @param to The receipient of the token.
     * @param tokenID The token to transfer.
     */
    function safeTransfer(address to, uint256 tokenID) external;

    /***************************************
    GASLESS APPROVALS
    ***************************************/

    /**
     * @notice Approve of a specific `tokenID` for spending by `spender` via signature.
     * @param spender The account that is being approved.
     * @param tokenID The ID of the token that is being approved for spending.
     * @param deadline The deadline timestamp by which the call must be mined for the approve to work.
     * @param v Must produce valid secp256k1 signature from the holder along with `r` and `s`.
     * @param r Must produce valid secp256k1 signature from the holder along with `v` and `s`.
     * @param s Must produce valid secp256k1 signature from the holder along with `r` and `v`.
     */
    function permit(
        address spender,
        uint256 tokenID,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @notice Returns the current nonce for `tokenID`. This value must be
     * included whenever a signature is generated for `permit`.
     * Every successful call to `permit` increases ``tokenID``'s nonce by one. This
     * prevents a signature from being used multiple times.
     * @param tokenID ID of the token to request nonce.
     * @return nonce Nonce of the token.
     */
    function nonces(uint256 tokenID) external view returns (uint256 nonce);

    /**
     * @notice The permit typehash used in the `permit` signature.
     * @return typehash The typehash for the `permit`.
     */
    // solhint-disable-next-line func-name-mixedcase
    function PERMIT_TYPEHASH() external view returns (bytes32 typehash);

    /**
     * @notice The domain separator used in the encoding of the signature for `permit`, as defined by `EIP712`.
     * @return seperator The domain seperator for `permit`.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32 seperator);

    /***************************************
    BETTER ENUMERATION
    ***************************************/

    /**
     * @notice Lists all tokens.
     * Order not specified.
     * @dev This function is more useful off chain than on chain.
     * @return tokenIDs The list of token IDs.
     */
    function listTokens() external view returns (uint256[] memory tokenIDs);

    /**
     * @notice Lists the tokens owned by `owner`.
     * Order not specified.
     * @dev This function is more useful off chain than on chain.
     * @return tokenIDs The list of token IDs.
     */
    function listTokensOfOwner(address owner) external view returns (uint256[] memory tokenIDs);

    /**
     * @notice Determines if a token exists or not.
     * @param tokenID The ID of the token to query.
     * @return status True if the token exists, false if it doesn't.
     */
    function exists(uint256 tokenID) external view returns (bool status);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}