// File: lib/solmate/src/tokens/ERC20.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

// File: lib/solmate/src/utils/ReentrancyGuard.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Gas optimized reentrancy protection for smart contracts.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/utils/ReentrancyGuard.sol)
/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/security/ReentrancyGuard.sol)
abstract contract ReentrancyGuard {
    uint256 private locked = 1;

    modifier nonReentrant() virtual {
        require(locked == 1, "REENTRANCY");

        locked = 2;

        _;

        locked = 1;
    }
}

// File: src/Kernel.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.15;

//     ███████    █████       █████ █████ ██████   ██████ ███████████  █████  █████  █████████
//   ███░░░░░███ ░░███       ░░███ ░░███ ░░██████ ██████ ░░███░░░░░███░░███  ░░███  ███░░░░░███
//  ███     ░░███ ░███        ░░███ ███   ░███░█████░███  ░███    ░███ ░███   ░███ ░███    ░░░
// ░███      ░███ ░███         ░░█████    ░███░░███ ░███  ░██████████  ░███   ░███ ░░█████████
// ░███      ░███ ░███          ░░███     ░███ ░░░  ░███  ░███░░░░░░   ░███   ░███  ░░░░░░░░███
// ░░███     ███  ░███      █    ░███     ░███      ░███  ░███         ░███   ░███  ███    ░███
//  ░░░███████░   ███████████    █████    █████     █████ █████        ░░████████  ░░█████████
//    ░░░░░░░    ░░░░░░░░░░░    ░░░░░    ░░░░░     ░░░░░ ░░░░░          ░░░░░░░░    ░░░░░░░░░

//============================================================================================//
//                                        GLOBAL TYPES                                        //
//============================================================================================//

/// @notice Actions to trigger state changes in the kernel. Passed by the executor
enum Actions {
    InstallModule,
    UpgradeModule,
    ActivatePolicy,
    DeactivatePolicy,
    ChangeExecutor,
    MigrateKernel
}

/// @notice Used by executor to select an action and a target contract for a kernel action
struct Instruction {
    Actions action;
    address target;
}

/// @notice Used to define which module functions a policy needs access to
struct Permissions {
    Keycode keycode;
    bytes4 funcSelector;
}

type Keycode is bytes5;

//============================================================================================//
//                                       UTIL FUNCTIONS                                       //
//============================================================================================//

error TargetNotAContract(address target_);
error InvalidKeycode(Keycode keycode_);

// solhint-disable-next-line func-visibility
function toKeycode(bytes5 keycode_) pure returns (Keycode) {
    return Keycode.wrap(keycode_);
}

// solhint-disable-next-line func-visibility
function fromKeycode(Keycode keycode_) pure returns (bytes5) {
    return Keycode.unwrap(keycode_);
}

// solhint-disable-next-line func-visibility
function ensureContract(address target_) view {
    if (target_.code.length == 0) revert TargetNotAContract(target_);
}

// solhint-disable-next-line func-visibility
function ensureValidKeycode(Keycode keycode_) pure {
    bytes5 unwrapped = Keycode.unwrap(keycode_);
    for (uint256 i = 0; i < 5; ) {
        bytes1 char = unwrapped[i];
        if (char < 0x41 || char > 0x5A) revert InvalidKeycode(keycode_); // A-Z only
        unchecked {
            i++;
        }
    }
}

//============================================================================================//
//                                        COMPONENTS                                          //
//============================================================================================//

/// @notice Generic adapter interface for kernel access in modules and policies.
abstract contract KernelAdapter {
    error KernelAdapter_OnlyKernel(address caller_);

    Kernel public kernel;

    constructor(Kernel kernel_) {
        kernel = kernel_;
    }

    /// @notice Modifier to restrict functions to be called only by kernel.
    modifier onlyKernel() {
        if (msg.sender != address(kernel)) revert KernelAdapter_OnlyKernel(msg.sender);
        _;
    }

    /// @notice Function used by kernel when migrating to a new kernel.
    function changeKernel(Kernel newKernel_) external onlyKernel {
        kernel = newKernel_;
    }
}

/// @notice Base level extension of the kernel. Modules act as independent state components to be
///         interacted with and mutated through policies.
/// @dev    Modules are installed and uninstalled via the executor.
abstract contract Module is KernelAdapter {
    error Module_PolicyNotPermitted(address policy_);

    constructor(Kernel kernel_) KernelAdapter(kernel_) {}

    /// @notice Modifier to restrict which policies have access to module functions.
    modifier permissioned() {
        if (!kernel.modulePermissions(KEYCODE(), Policy(msg.sender), msg.sig))
            revert Module_PolicyNotPermitted(msg.sender);
        _;
    }

    /// @notice 5 byte identifier for a module.
    function KEYCODE() public pure virtual returns (Keycode) {}

    /// @notice Returns which semantic version of a module is being implemented.
    /// @return major - Major version upgrade indicates breaking change to the interface.
    /// @return minor - Minor version change retains backward-compatible interface.
    function VERSION() external pure virtual returns (uint8 major, uint8 minor) {}

    /// @notice Initialization function for the module
    /// @dev    This function is called when the module is installed or upgraded by the kernel.
    /// @dev    MUST BE GATED BY onlyKernel. Used to encompass any initialization or upgrade logic.
    function INIT() external virtual onlyKernel {}
}

/// @notice Policies are application logic and external interface for the kernel and installed modules.
/// @dev    Policies are activated and deactivated in the kernel by the executor.
/// @dev    Module dependencies and function permissions must be defined in appropriate functions.
abstract contract Policy is KernelAdapter {
    error Policy_ModuleDoesNotExist(Keycode keycode_);

    constructor(Kernel kernel_) KernelAdapter(kernel_) {}

    /// @notice Easily accessible indicator for if a policy is activated or not.
    function isActive() external view returns (bool) {
        return kernel.isPolicyActive(this);
    }

    /// @notice Function to grab module address from a given keycode.
    function getModuleAddress(Keycode keycode_) internal view returns (address) {
        address moduleForKeycode = address(kernel.getModuleForKeycode(keycode_));
        if (moduleForKeycode == address(0)) revert Policy_ModuleDoesNotExist(keycode_);
        return moduleForKeycode;
    }

    /// @notice Define module dependencies for this policy.
    /// @return dependencies - Keycode array of module dependencies.
    function configureDependencies() external virtual returns (Keycode[] memory dependencies) {}

    /// @notice Function called by kernel to set module function permissions.
    /// @return requests - Array of keycodes and function selectors for requested permissions.
    function requestPermissions() external view virtual returns (Permissions[] memory requests) {}
}

/// @notice Main contract that acts as a central component registry for the protocol.
/// @dev    The kernel manages modules and policies. The kernel is mutated via predefined Actions,
/// @dev    which are input from any address assigned as the executor. The executor can be changed as needed.
contract Kernel {
    // =========  EVENTS ========= //

    event PermissionsUpdated(
        Keycode indexed keycode_,
        Policy indexed policy_,
        bytes4 funcSelector_,
        bool granted_
    );
    event ActionExecuted(Actions indexed action_, address indexed target_);

    // =========  ERRORS ========= //

    error Kernel_OnlyExecutor(address caller_);
    error Kernel_ModuleAlreadyInstalled(Keycode module_);
    error Kernel_InvalidModuleUpgrade(Keycode module_);
    error Kernel_PolicyAlreadyActivated(address policy_);
    error Kernel_PolicyNotActivated(address policy_);

    // =========  PRIVILEGED ADDRESSES ========= //

    /// @notice Address that is able to initiate Actions in the kernel. Can be assigned to a multisig or governance contract.
    address public executor;

    // =========  MODULE MANAGEMENT ========= //

    /// @notice Array of all modules currently installed.
    Keycode[] public allKeycodes;

    /// @notice Mapping of module address to keycode.
    mapping(Keycode => Module) public getModuleForKeycode;

    /// @notice Mapping of keycode to module address.
    mapping(Module => Keycode) public getKeycodeForModule;

    /// @notice Mapping of a keycode to all of its policy dependents. Used to efficiently reconfigure policy dependencies.
    mapping(Keycode => Policy[]) public moduleDependents;

    /// @notice Helper for module dependent arrays. Prevents the need to loop through array.
    mapping(Keycode => mapping(Policy => uint256)) public getDependentIndex;

    /// @notice Module <> Policy Permissions.
    /// @dev    Keycode -> Policy -> Function Selector -> bool for permission
    mapping(Keycode => mapping(Policy => mapping(bytes4 => bool))) public modulePermissions;

    // =========  POLICY MANAGEMENT ========= //

    /// @notice List of all active policies
    Policy[] public activePolicies;

    /// @notice Helper to get active policy quickly. Prevents need to loop through array.
    mapping(Policy => uint256) public getPolicyIndex;

    //============================================================================================//
    //                                       CORE FUNCTIONS                                       //
    //============================================================================================//

    constructor() {
        executor = msg.sender;
    }

    /// @notice Modifier to check if caller is the executor.
    modifier onlyExecutor() {
        if (msg.sender != executor) revert Kernel_OnlyExecutor(msg.sender);
        _;
    }

    function isPolicyActive(Policy policy_) public view returns (bool) {
        return activePolicies.length > 0 && activePolicies[getPolicyIndex[policy_]] == policy_;
    }

    /// @notice Main kernel function. Initiates state changes to kernel depending on Action passed in.
    function executeAction(Actions action_, address target_) external onlyExecutor {
        if (action_ == Actions.InstallModule) {
            ensureContract(target_);
            ensureValidKeycode(Module(target_).KEYCODE());
            _installModule(Module(target_));
        } else if (action_ == Actions.UpgradeModule) {
            ensureContract(target_);
            ensureValidKeycode(Module(target_).KEYCODE());
            _upgradeModule(Module(target_));
        } else if (action_ == Actions.ActivatePolicy) {
            ensureContract(target_);
            _activatePolicy(Policy(target_));
        } else if (action_ == Actions.DeactivatePolicy) {
            ensureContract(target_);
            _deactivatePolicy(Policy(target_));
        } else if (action_ == Actions.ChangeExecutor) {
            executor = target_;
        } else if (action_ == Actions.MigrateKernel) {
            ensureContract(target_);
            _migrateKernel(Kernel(target_));
        }

        emit ActionExecuted(action_, target_);
    }

    function _installModule(Module newModule_) internal {
        Keycode keycode = newModule_.KEYCODE();

        if (address(getModuleForKeycode[keycode]) != address(0))
            revert Kernel_ModuleAlreadyInstalled(keycode);

        getModuleForKeycode[keycode] = newModule_;
        getKeycodeForModule[newModule_] = keycode;
        allKeycodes.push(keycode);

        newModule_.INIT();
    }

    function _upgradeModule(Module newModule_) internal {
        Keycode keycode = newModule_.KEYCODE();
        Module oldModule = getModuleForKeycode[keycode];

        if (address(oldModule) == address(0) || oldModule == newModule_)
            revert Kernel_InvalidModuleUpgrade(keycode);

        getKeycodeForModule[oldModule] = Keycode.wrap(bytes5(0));
        getKeycodeForModule[newModule_] = keycode;
        getModuleForKeycode[keycode] = newModule_;

        newModule_.INIT();

        _reconfigurePolicies(keycode);
    }

    function _activatePolicy(Policy policy_) internal {
        if (isPolicyActive(policy_)) revert Kernel_PolicyAlreadyActivated(address(policy_));

        // Add policy to list of active policies
        activePolicies.push(policy_);
        getPolicyIndex[policy_] = activePolicies.length - 1;

        // Record module dependencies
        Keycode[] memory dependencies = policy_.configureDependencies();
        uint256 depLength = dependencies.length;

        for (uint256 i; i < depLength; ) {
            Keycode keycode = dependencies[i];

            moduleDependents[keycode].push(policy_);
            getDependentIndex[keycode][policy_] = moduleDependents[keycode].length - 1;

            unchecked {
                ++i;
            }
        }

        // Grant permissions for policy to access restricted module functions
        Permissions[] memory requests = policy_.requestPermissions();
        _setPolicyPermissions(policy_, requests, true);
    }

    function _deactivatePolicy(Policy policy_) internal {
        if (!isPolicyActive(policy_)) revert Kernel_PolicyNotActivated(address(policy_));

        // Revoke permissions
        Permissions[] memory requests = policy_.requestPermissions();
        _setPolicyPermissions(policy_, requests, false);

        // Remove policy from all policy data structures
        uint256 idx = getPolicyIndex[policy_];
        Policy lastPolicy = activePolicies[activePolicies.length - 1];

        activePolicies[idx] = lastPolicy;
        activePolicies.pop();
        getPolicyIndex[lastPolicy] = idx;
        delete getPolicyIndex[policy_];

        // Remove policy from module dependents
        _pruneFromDependents(policy_);
    }

    /// @notice All functionality will move to the new kernel. WARNING: ACTION WILL BRICK THIS KERNEL.
    /// @dev    New kernel must add in all of the modules and policies via executeAction.
    /// @dev    NOTE: Data does not get cleared from this kernel.
    function _migrateKernel(Kernel newKernel_) internal {
        uint256 keycodeLen = allKeycodes.length;
        for (uint256 i; i < keycodeLen; ) {
            Module module = Module(getModuleForKeycode[allKeycodes[i]]);
            module.changeKernel(newKernel_);
            unchecked {
                ++i;
            }
        }

        uint256 policiesLen = activePolicies.length;
        for (uint256 j; j < policiesLen; ) {
            Policy policy = activePolicies[j];

            // Deactivate before changing kernel
            policy.changeKernel(newKernel_);
            unchecked {
                ++j;
            }
        }
    }

    function _reconfigurePolicies(Keycode keycode_) internal {
        Policy[] memory dependents = moduleDependents[keycode_];
        uint256 depLength = dependents.length;

        for (uint256 i; i < depLength; ) {
            dependents[i].configureDependencies();

            unchecked {
                ++i;
            }
        }
    }

    function _setPolicyPermissions(
        Policy policy_,
        Permissions[] memory requests_,
        bool grant_
    ) internal {
        uint256 reqLength = requests_.length;
        for (uint256 i = 0; i < reqLength; ) {
            Permissions memory request = requests_[i];
            modulePermissions[request.keycode][policy_][request.funcSelector] = grant_;

            emit PermissionsUpdated(request.keycode, policy_, request.funcSelector, grant_);

            unchecked {
                ++i;
            }
        }
    }

    function _pruneFromDependents(Policy policy_) internal {
        Keycode[] memory dependencies = policy_.configureDependencies();
        uint256 depcLength = dependencies.length;

        for (uint256 i; i < depcLength; ) {
            Keycode keycode = dependencies[i];
            Policy[] storage dependents = moduleDependents[keycode];

            uint256 origIndex = getDependentIndex[keycode][policy_];
            Policy lastPolicy = dependents[dependents.length - 1];

            // Swap with last and pop
            dependents[origIndex] = lastPolicy;
            dependents.pop();

            // Record new index and delete deactivated policy index
            getDependentIndex[keycode][lastPolicy] = origIndex;
            delete getDependentIndex[keycode][policy_];

            unchecked {
                ++i;
            }
        }
    }
}

// File: src/interfaces/AggregatorV2V3Interface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface AggregatorInterface {
    function latestAnswer() external view returns (int256);

    function latestTimestamp() external view returns (uint256);

    function latestRound() external view returns (uint256);

    function getAnswer(uint256 roundId) external view returns (int256);

    function getTimestamp(uint256 roundId) external view returns (uint256);

    event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 updatedAt);

    event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt);
}

interface AggregatorV3Interface {
    function decimals() external view returns (uint8);

    function description() external view returns (string memory);

    function version() external view returns (uint256);

    // getRoundData and latestRoundData should both raise "No data present"
    // if they do not have data to report, instead of returning unset values
    // which could be misinterpreted as actual reported values.
    function getRoundData(uint80 _roundId)
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );

    function latestRoundData()
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );
}

interface AggregatorV2V3Interface is AggregatorInterface, AggregatorV3Interface {}

// File: src/interfaces/IBondAggregator.sol



// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.0;

import {ERC20} from "solmate/tokens/ERC20.sol";
import {IBondAuctioneer} from "../interfaces/IBondAuctioneer.sol";
import {IBondTeller} from "../interfaces/IBondTeller.sol";

interface IBondAggregator {
    /// @notice             Register a auctioneer with the aggregator
    /// @notice             Only Guardian
    /// @param auctioneer_  Address of the Auctioneer to register
    /// @dev                A auctioneer must be registered with an aggregator to create markets
    function registerAuctioneer(IBondAuctioneer auctioneer_) external;

    /// @notice             Register a new market with the aggregator
    /// @notice             Only registered depositories
    /// @param payoutToken_ Token to be paid out by the market
    /// @param quoteToken_  Token to be accepted by the market
    /// @param marketId     ID of the market being created
    function registerMarket(ERC20 payoutToken_, ERC20 quoteToken_)
        external
        returns (uint256 marketId);

    /// @notice     Get the auctioneer for the provided market ID
    /// @param id_  ID of Market
    function getAuctioneer(uint256 id_) external view returns (IBondAuctioneer);

    /// @notice             Calculate current market price of payout token in quote tokens
    /// @dev                Accounts for debt and control variable decay since last deposit (vs _marketPrice())
    /// @param id_          ID of market
    /// @return             Price for market (see the specific auctioneer for units)
    //
    // if price is below minimum price, minimum price is returned
    // this is enforced on deposits by manipulating total debt (see _decay())
    function marketPrice(uint256 id_) external view returns (uint256);

    /// @notice             Scale value to use when converting between quote token and payout token amounts with marketPrice()
    /// @param id_          ID of market
    /// @return             Scaling factor for market in configured decimals
    function marketScale(uint256 id_) external view returns (uint256);

    /// @notice             Payout due for amount of quote tokens
    /// @dev                Accounts for debt and control variable decay so it is up to date
    /// @param amount_      Amount of quote tokens to spend
    /// @param id_          ID of market
    /// @param referrer_    Address of referrer, used to get fees to calculate accurate payout amount.
    ///                     Inputting the zero address will take into account just the protocol fee.
    /// @return             amount of payout tokens to be paid
    function payoutFor(
        uint256 amount_,
        uint256 id_,
        address referrer_
    ) external view returns (uint256);

    /// @notice             Returns maximum amount of quote token accepted by the market
    /// @param id_          ID of market
    /// @param referrer_    Address of referrer, used to get fees to calculate accurate payout amount.
    ///                     Inputting the zero address will take into account just the protocol fee.
    function maxAmountAccepted(uint256 id_, address referrer_) external view returns (uint256);

    /// @notice             Does market send payout immediately
    /// @param id_          Market ID to search for
    function isInstantSwap(uint256 id_) external view returns (bool);

    /// @notice             Is a given market accepting deposits
    /// @param id_          ID of market
    function isLive(uint256 id_) external view returns (bool);

    /// @notice             Returns array of active market IDs within a range
    /// @dev                Should be used if length exceeds max to query entire array
    function liveMarketsBetween(uint256 firstIndex_, uint256 lastIndex_)
        external
        view
        returns (uint256[] memory);

    /// @notice             Returns an array of all active market IDs for a given quote token
    /// @param token_       Address of token to query by
    /// @param isPayout_    If true, search by payout token, else search for quote token
    function liveMarketsFor(address token_, bool isPayout_)
        external
        view
        returns (uint256[] memory);

    /// @notice             Returns an array of all active market IDs for a given owner
    /// @param owner_       Address of owner to query by
    /// @param firstIndex_  Market ID to start at
    /// @param lastIndex_   Market ID to end at (non-inclusive)
    function liveMarketsBy(
        address owner_,
        uint256 firstIndex_,
        uint256 lastIndex_
    ) external view returns (uint256[] memory);

    /// @notice             Returns an array of all active market IDs for a given payout and quote token
    /// @param payout_      Address of payout token
    /// @param quote_       Address of quote token
    function marketsFor(address payout_, address quote_) external view returns (uint256[] memory);

    /// @notice                 Returns the market ID with the highest current payoutToken payout for depositing quoteToken
    /// @param payout_          Address of payout token
    /// @param quote_           Address of quote token
    /// @param amountIn_        Amount of quote tokens to deposit
    /// @param minAmountOut_    Minimum amount of payout tokens to receive as payout
    /// @param maxExpiry_       Latest acceptable vesting timestamp for bond
    ///                         Inputting the zero address will take into account just the protocol fee.
    function findMarketFor(
        address payout_,
        address quote_,
        uint256 amountIn_,
        uint256 minAmountOut_,
        uint256 maxExpiry_
    ) external view returns (uint256 id);

    /// @notice             Returns the Teller that services the market ID
    function getTeller(uint256 id_) external view returns (IBondTeller);

    /// @notice             Returns current capacity of a market
    function currentCapacity(uint256 id_) external view returns (uint256);
}

// File: src/interfaces/IBondAuctioneer.sol



// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.0;

import {ERC20} from "solmate/tokens/ERC20.sol";
import {IBondTeller} from "../interfaces/IBondTeller.sol";
import {IBondAggregator} from "../interfaces/IBondAggregator.sol";

interface IBondAuctioneer {
    /// @notice                 Creates a new bond market
    /// @param params_          Configuration data needed for market creation, encoded in a bytes array
    /// @dev                    See specific auctioneer implementations for details on encoding the parameters.
    /// @return id              ID of new bond market
    function createMarket(bytes memory params_) external returns (uint256);

    /// @notice                 Disable existing bond market
    /// @notice                 Must be market owner
    /// @param id_              ID of market to close
    function closeMarket(uint256 id_) external;

    /// @notice                 Exchange quote tokens for a bond in a specified market
    /// @notice                 Must be teller
    /// @param id_              ID of the Market the bond is being purchased from
    /// @param amount_          Amount to deposit in exchange for bond (after fee has been deducted)
    /// @param minAmountOut_    Minimum acceptable amount of bond to receive. Prevents frontrunning
    /// @return payout          Amount of payout token to be received from the bond
    function purchaseBond(
        uint256 id_,
        uint256 amount_,
        uint256 minAmountOut_
    ) external returns (uint256 payout);

    /// @notice                         Set market intervals to different values than the defaults
    /// @notice                         Must be market owner
    /// @dev                            Changing the intervals could cause markets to behave in unexpected way
    ///                                 tuneInterval should be greater than tuneAdjustmentDelay
    /// @param id_                      Market ID
    /// @param intervals_               Array of intervals (3)
    ///                                 1. Tune interval - Frequency of tuning
    ///                                 2. Tune adjustment delay - Time to implement downward tuning adjustments
    ///                                 3. Debt decay interval - Interval over which debt should decay completely
    function setIntervals(uint256 id_, uint32[3] calldata intervals_) external;

    /// @notice                      Designate a new owner of a market
    /// @notice                      Must be market owner
    /// @dev                         Doesn't change permissions until newOwner calls pullOwnership
    /// @param id_                   Market ID
    /// @param newOwner_             New address to give ownership to
    function pushOwnership(uint256 id_, address newOwner_) external;

    /// @notice                      Accept ownership of a market
    /// @notice                      Must be market newOwner
    /// @dev                         The existing owner must call pushOwnership prior to the newOwner calling this function
    /// @param id_                   Market ID
    function pullOwnership(uint256 id_) external;

    /// @notice             Set the auctioneer defaults
    /// @notice             Must be policy
    /// @param defaults_    Array of default values
    ///                     1. Tune interval - amount of time between tuning adjustments
    ///                     2. Tune adjustment delay - amount of time to apply downward tuning adjustments
    ///                     3. Minimum debt decay interval - minimum amount of time to let debt decay to zero
    ///                     4. Minimum deposit interval - minimum amount of time to wait between deposits
    ///                     5. Minimum market duration - minimum amount of time a market can be created for
    ///                     6. Minimum debt buffer - the minimum amount of debt over the initial debt to trigger a market shutdown
    /// @dev                The defaults set here are important to avoid edge cases in market behavior, e.g. a very short market reacts doesn't tune well
    /// @dev                Only applies to new markets that are created after the change
    function setDefaults(uint32[6] memory defaults_) external;

    /// @notice             Change the status of the auctioneer to allow creation of new markets
    /// @dev                Setting to false and allowing active markets to end will sunset the auctioneer
    /// @param status_      Allow market creation (true) : Disallow market creation (false)
    function setAllowNewMarkets(bool status_) external;

    /// @notice             Change whether a market creator is allowed to use a callback address in their markets or not
    /// @notice             Must be guardian
    /// @dev                Callback is believed to be safe, but a whitelist is implemented to prevent abuse
    /// @param creator_     Address of market creator
    /// @param status_      Allow callback (true) : Disallow callback (false)
    function setCallbackAuthStatus(address creator_, bool status_) external;

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

    /// @notice                 Provides information for the Teller to execute purchases on a Market
    /// @param id_              Market ID
    /// @return owner           Address of the market owner (tokens transferred from this address if no callback)
    /// @return callbackAddr    Address of the callback contract to get tokens for payouts
    /// @return payoutToken     Payout Token (token paid out) for the Market
    /// @return quoteToken      Quote Token (token received) for the Market
    /// @return vesting         Timestamp or duration for vesting, implementation-dependent
    /// @return maxPayout       Maximum amount of payout tokens you can purchase in one transaction
    function getMarketInfoForPurchase(uint256 id_)
        external
        view
        returns (
            address owner,
            address callbackAddr,
            ERC20 payoutToken,
            ERC20 quoteToken,
            uint48 vesting,
            uint256 maxPayout
        );

    /// @notice             Calculate current market price of payout token in quote tokens
    /// @param id_          ID of market
    /// @return             Price for market in configured decimals
    //
    // if price is below minimum price, minimum price is returned
    function marketPrice(uint256 id_) external view returns (uint256);

    /// @notice             Scale value to use when converting between quote token and payout token amounts with marketPrice()
    /// @param id_          ID of market
    /// @return             Scaling factor for market in configured decimals
    function marketScale(uint256 id_) external view returns (uint256);

    /// @notice             Payout due for amount of quote tokens
    /// @dev                Accounts for debt and control variable decay so it is up to date
    /// @param amount_      Amount of quote tokens to spend
    /// @param id_          ID of market
    /// @param referrer_    Address of referrer, used to get fees to calculate accurate payout amount.
    ///                     Inputting the zero address will take into account just the protocol fee.
    /// @return             amount of payout tokens to be paid
    function payoutFor(
        uint256 amount_,
        uint256 id_,
        address referrer_
    ) external view returns (uint256);

    /// @notice             Returns maximum amount of quote token accepted by the market
    /// @param id_          ID of market
    /// @param referrer_    Address of referrer, used to get fees to calculate accurate payout amount.
    ///                     Inputting the zero address will take into account just the protocol fee.
    function maxAmountAccepted(uint256 id_, address referrer_) external view returns (uint256);

    /// @notice             Does market send payout immediately
    /// @param id_          Market ID to search for
    function isInstantSwap(uint256 id_) external view returns (bool);

    /// @notice             Is a given market accepting deposits
    /// @param id_          ID of market
    function isLive(uint256 id_) external view returns (bool);

    /// @notice             Returns the address of the market owner
    /// @param id_          ID of market
    function ownerOf(uint256 id_) external view returns (address);

    /// @notice             Returns the Teller that services the Auctioneer
    function getTeller() external view returns (IBondTeller);

    /// @notice             Returns the Aggregator that services the Auctioneer
    function getAggregator() external view returns (IBondAggregator);

    /// @notice             Returns current capacity of a market
    function currentCapacity(uint256 id_) external view returns (uint256);
}

// File: src/interfaces/IBondCallback.sol



// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.0;

import {ERC20} from "solmate/tokens/ERC20.sol";

interface IBondCallback {
    /// @notice                 Send payout tokens to Teller while allowing market owners to perform custom logic on received or paid out tokens
    /// @notice                 Market ID on Teller must be whitelisted
    /// @param id_              ID of the market
    /// @param inputAmount_     Amount of quote tokens bonded to the market
    /// @param outputAmount_    Amount of payout tokens to be paid out to the market
    /// @dev Must transfer the output amount of payout tokens back to the Teller
    /// @dev Should check that the quote tokens have been transferred to the contract in the _callback function
    function callback(
        uint256 id_,
        uint256 inputAmount_,
        uint256 outputAmount_
    ) external;

    /// @notice         Returns the number of quote tokens received and payout tokens paid out for a market
    /// @param id_      ID of the market
    /// @return in_     Amount of quote tokens bonded to the market
    /// @return out_    Amount of payout tokens paid out to the market
    function amountsForMarket(uint256 id_) external view returns (uint256 in_, uint256 out_);

    /// @notice         Whitelist a teller and market ID combination
    /// @notice         Must be callback owner
    /// @param teller_  Address of the Teller contract which serves the market
    /// @param id_      ID of the market
    function whitelist(address teller_, uint256 id_) external;

    /// @notice Remove a market ID on a teller from the whitelist
    /// @dev    Shutdown function in case there's an issue with the teller
    /// @param  teller_ Address of the Teller contract which serves the market
    /// @param  id_     ID of the market to remove from whitelist
    function blacklist(address teller_, uint256 id_) external;
}

// File: src/interfaces/IBondSDA.sol



// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.0;

import {ERC20} from "solmate/tokens/ERC20.sol";
import {IBondAuctioneer} from "../interfaces/IBondAuctioneer.sol";

interface IBondSDA is IBondAuctioneer {
    /// @notice Main information pertaining to bond market
    struct BondMarket {
        address owner; // market owner. sends payout tokens, receives quote tokens (defaults to creator)
        ERC20 payoutToken; // token to pay depositors with
        ERC20 quoteToken; // token to accept as payment
        address callbackAddr; // address to call for any operations on bond purchase. Must inherit to IBondCallback.
        bool capacityInQuote; // capacity limit is in payment token (true) or in payout (false, default)
        uint256 capacity; // capacity remaining
        uint256 totalDebt; // total payout token debt from market
        uint256 minPrice; // minimum price (hard floor for the market)
        uint256 maxPayout; // max payout tokens out in one order
        uint256 sold; // payout tokens out
        uint256 purchased; // quote tokens in
        uint256 scale; // scaling factor for the market (see MarketParams struct)
    }

    /// @notice Information used to control how a bond market changes
    struct BondTerms {
        uint256 controlVariable; // scaling variable for price
        uint256 maxDebt; // max payout token debt accrued
        uint48 vesting; // length of time from deposit to expiry if fixed-term, vesting timestamp if fixed-expiry
        uint48 conclusion; // timestamp when market no longer offered
    }

    /// @notice Data needed for tuning bond market
    /// @dev Durations are stored in uint32 (not int32) and timestamps are stored in uint48, so is not subject to Y2K38 overflow
    struct BondMetadata {
        uint48 lastTune; // last timestamp when control variable was tuned
        uint48 lastDecay; // last timestamp when market was created and debt was decayed
        uint32 length; // time from creation to conclusion.
        uint32 depositInterval; // target frequency of deposits
        uint32 tuneInterval; // frequency of tuning
        uint32 tuneAdjustmentDelay; // time to implement downward tuning adjustments
        uint32 debtDecayInterval; // interval over which debt should decay completely
        uint256 tuneIntervalCapacity; // capacity expected to be used during a tuning interval
        uint256 tuneBelowCapacity; // capacity that the next tuning will occur at
        uint256 lastTuneDebt; // target debt calculated at last tuning
    }

    /// @notice Control variable adjustment data
    struct Adjustment {
        uint256 change;
        uint48 lastAdjustment;
        uint48 timeToAdjusted; // how long until adjustment happens
        bool active;
    }

    /// @notice             Parameters to create a new bond market
    /// @dev                Note price should be passed in a specific format:
    ///                     formatted price = (payoutPriceCoefficient / quotePriceCoefficient)
    ///                             * 10**(36 + scaleAdjustment + quoteDecimals - payoutDecimals + payoutPriceDecimals - quotePriceDecimals)
    ///                     where:
    ///                         payoutDecimals - Number of decimals defined for the payoutToken in its ERC20 contract
    ///                         quoteDecimals - Number of decimals defined for the quoteToken in its ERC20 contract
    ///                         payoutPriceCoefficient - The coefficient of the payoutToken price in scientific notation (also known as the significant digits)
    ///                         payoutPriceDecimals - The significand of the payoutToken price in scientific notation (also known as the base ten exponent)
    ///                         quotePriceCoefficient - The coefficient of the quoteToken price in scientific notation (also known as the significant digits)
    ///                         quotePriceDecimals - The significand of the quoteToken price in scientific notation (also known as the base ten exponent)
    ///                         scaleAdjustment - see below
    ///                         * In the above definitions, the "prices" need to have the same unit of account (i.e. both in OHM, $, ETH, etc.)
    ///                         If price is not provided in this format, the market will not behave as intended.
    /// @param params_      Encoded bytes array, with the following elements
    /// @dev                    0. Payout Token (token paid out)
    /// @dev                    1. Quote Token (token to be received)
    /// @dev                    2. Callback contract address, should conform to IBondCallback. If 0x00, tokens will be transferred from market.owner
    /// @dev                    3. Is Capacity in Quote Token?
    /// @dev                    4. Capacity (amount in quoteDecimals or amount in payoutDecimals)
    /// @dev                    5. Formatted initial price (see note above)
    /// @dev                    6. Formatted minimum price (see note above)
    /// @dev                    7. Debt buffer. Percent with 3 decimals. Percentage over the initial debt to allow the market to accumulate at anyone time.
    /// @dev                       Works as a circuit breaker for the market in case external conditions incentivize massive buying (e.g. stablecoin depeg).
    /// @dev                       Minimum is the greater of 10% or initial max payout as a percentage of capacity.
    /// @dev                       If the value is too small, the market will not be able function normally and close prematurely.
    /// @dev                       If the value is too large, the market will not circuit break when intended. The value must be > 10% but can exceed 100% if desired.
    /// @dev                       A good heuristic to calculate a debtBuffer with is to determine the amount of capacity that you think is reasonable to be expended
    /// @dev                       in a short duration as a percent, e.g. 25%. Then a reasonable debtBuffer would be: 0.25 * 1e3 * decayInterval / marketDuration
    /// @dev                       where decayInterval = max(3 days, 5 * depositInterval) and marketDuration = conclusion - creation time.
    /// @dev                    8. Is fixed term ? Vesting length (seconds) : Vesting expiry (timestamp).
    /// @dev                        A 'vesting' param longer than 50 years is considered a timestamp for fixed expiry.
    /// @dev                    9. Conclusion (timestamp)
    /// @dev                    10. Deposit interval (seconds)
    /// @dev                    11. Market scaling factor adjustment, ranges from -24 to +24 within the configured market bounds.
    /// @dev                        Should be calculated as: (payoutDecimals - quoteDecimals) - ((payoutPriceDecimals - quotePriceDecimals) / 2)
    /// @dev                        Providing a scaling factor adjustment that doesn't follow this formula could lead to under or overflow errors in the market.
    /// @return                 ID of new bond market
    struct MarketParams {
        ERC20 payoutToken;
        ERC20 quoteToken;
        address callbackAddr;
        bool capacityInQuote;
        uint256 capacity;
        uint256 formattedInitialPrice;
        uint256 formattedMinimumPrice;
        uint32 debtBuffer;
        uint48 vesting;
        uint48 conclusion;
        uint32 depositInterval;
        int8 scaleAdjustment;
    }

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

    /// @notice             Calculate current market price of payout token in quote tokens
    /// @dev                Accounts for debt and control variable decay since last deposit (vs _marketPrice())
    /// @param id_          ID of market
    /// @return             Price for market in configured decimals (see MarketParams)
    //
    // price is derived from the equation
    //
    // p = c * d
    //
    // where
    // p = price
    // c = control variable
    // d = debt
    //
    // d -= ( d * (dt / l) )
    //
    // where
    // dt = change in time
    // l = length of program
    //
    // if price is below minimum price, minimum price is returned
    // this is enforced on deposits by manipulating total debt (see _decay())
    function marketPrice(uint256 id_) external view override returns (uint256);

    /// @notice             Calculate debt factoring in decay
    /// @dev                Accounts for debt decay since last deposit
    /// @param id_          ID of market
    /// @return             Current debt for market in payout token decimals
    function currentDebt(uint256 id_) external view returns (uint256);

    /// @notice             Up to date control variable
    /// @dev                Accounts for control variable adjustment
    /// @param id_          ID of market
    /// @return             Control variable for market in payout token decimals
    function currentControlVariable(uint256 id_) external view returns (uint256);
}

// File: src/interfaces/IBondTeller.sol



// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.0;

import {ERC20} from "solmate/tokens/ERC20.sol";

interface IBondTeller {
    /// @notice                 Exchange quote tokens for a bond in a specified market
    /// @param recipient_       Address of recipient of bond. Allows deposits for other addresses
    /// @param referrer_        Address of referrer who will receive referral fee. For frontends to fill.
    ///                         Direct calls can use the zero address for no referrer fee.
    /// @param id_              ID of the Market the bond is being purchased from
    /// @param amount_          Amount to deposit in exchange for bond
    /// @param minAmountOut_    Minimum acceptable amount of bond to receive. Prevents frontrunning
    /// @return                 Amount of payout token to be received from the bond
    /// @return                 Timestamp at which the bond token can be redeemed for the underlying token
    function purchase(
        address recipient_,
        address referrer_,
        uint256 id_,
        uint256 amount_,
        uint256 minAmountOut_
    ) external returns (uint256, uint48);

    /// @notice          Get current fee charged by the teller based on the combined protocol and referrer fee
    /// @param referrer_ Address of the referrer
    /// @return          Fee in basis points (3 decimal places)
    function getFee(address referrer_) external view returns (uint48);

    /// @notice         Set protocol fee
    /// @notice         Must be guardian
    /// @param fee_     Protocol fee in basis points (3 decimal places)
    function setProtocolFee(uint48 fee_) external;

    /// @notice          Set the discount for creating bond tokens from the base protocol fee
    /// @dev             The discount is subtracted from the protocol fee to determine the fee
    ///                  when using create() to mint bond tokens without using an Auctioneer
    /// @param discount_ Create Fee Discount in basis points (3 decimal places)
    function setCreateFeeDiscount(uint48 discount_) external;

    /// @notice         Set your fee as a referrer to the protocol
    /// @notice         Fee is set for sending address
    /// @param fee_     Referrer fee in basis points (3 decimal places)
    function setReferrerFee(uint48 fee_) external;

    /// @notice         Claim fees accrued by sender in the input tokens and sends them to the provided address
    /// @param tokens_  Array of tokens to claim fees for
    /// @param to_      Address to send fees to
    function claimFees(ERC20[] memory tokens_, address to_) external;
}

// File: src/libraries/TransferHelper.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "solmate/tokens/ERC20.sol";

/// @notice Safe ERC20 and ETH transfer library that safely handles missing return values.
/// @author Modified from Uniswap & old Solmate (https://github.com/Uniswap/uniswap-v3-periphery/blob/main/contracts/libraries/TransferHelper.sol)
library TransferHelper {
    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        (bool success, bytes memory data) = address(token).call(
            abi.encodeWithSelector(ERC20.transferFrom.selector, from, to, amount)
        );

        require(success && (data.length == 0 || abi.decode(data, (bool))), "TRANSFER_FROM_FAILED");
    }

    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        (bool success, bytes memory data) = address(token).call(
            abi.encodeWithSelector(ERC20.transfer.selector, to, amount)
        );

        require(success && (data.length == 0 || abi.decode(data, (bool))), "TRANSFER_FAILED");
    }

    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        (bool success, bytes memory data) = address(token).call(
            abi.encodeWithSelector(ERC20.approve.selector, to, amount)
        );

        require(success && (data.length == 0 || abi.decode(data, (bool))), "APPROVE_FAILED");
    }
}

// File: src/modules/PRICE/PRICE.v1.sol



// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.8.15;

import {AggregatorV2V3Interface} from "interfaces/AggregatorV2V3Interface.sol";
import "src/Kernel.sol";

/// @notice Price oracle data storage
/// @dev    The Olympus Price Oracle contract provides a standard interface for OHM price data against a reserve asset.
///         It also implements a moving average price calculation (same as a TWAP) on the price feed data over a configured
///         duration and observation frequency. The data provided by this contract is used by the Olympus Range Operator to
///         perform market operations. The Olympus Price Oracle is updated each epoch by the Olympus Heart contract.
abstract contract PRICEv1 is Module {
    // =========  EVENTS ========= //

    event NewObservation(uint256 timestamp_, uint256 price_, uint256 movingAverage_);
    event MovingAverageDurationChanged(uint48 movingAverageDuration_);
    event ObservationFrequencyChanged(uint48 observationFrequency_);
    event UpdateThresholdsChanged(uint48 ohmEthUpdateThreshold_, uint48 reserveEthUpdateThreshold_);

    // =========  ERRORS ========= //

    error Price_InvalidParams();
    error Price_NotInitialized();
    error Price_AlreadyInitialized();
    error Price_BadFeed(address priceFeed);

    // =========  STATE ========= //

    /// @dev    Price feeds. Chainlink typically provides price feeds for an asset in ETH. Therefore, we use two price feeds against ETH, one for OHM and one for the Reserve asset, to calculate the relative price of OHM in the Reserve asset.
    /// @dev    Update thresholds are the maximum amount of time that can pass between price feed updates before the price oracle is considered stale. These should be set based on the parameters of the price feed.

    /// @notice OHM/ETH price feed
    AggregatorV2V3Interface public ohmEthPriceFeed;

    /// @notice Maximum expected time between OHM/ETH price feed updates
    uint48 public ohmEthUpdateThreshold;

    /// @notice Reserve/ETH price feed
    AggregatorV2V3Interface public reserveEthPriceFeed;

    /// @notice Maximum expected time between OHM/ETH price feed updates
    uint48 public reserveEthUpdateThreshold;

    /// @notice    Running sum of observations to calculate the moving average price from
    /// @dev       See getMovingAverage()
    uint256 public cumulativeObs;

    /// @notice Array of price observations. Check nextObsIndex to determine latest data point.
    /// @dev    Observations are stored in a ring buffer where the moving average is the sum of all observations divided by the number of observations.
    ///         Observations can be cleared by changing the movingAverageDuration or observationFrequency and must be re-initialized.
    uint256[] public observations;

    /// @notice Index of the next observation to make. The current value at this index is the oldest observation.
    uint32 public nextObsIndex;

    /// @notice Number of observations used in the moving average calculation. Computed from movingAverageDuration / observationFrequency.
    uint32 public numObservations;

    /// @notice Frequency (in seconds) that observations should be stored.
    uint48 public observationFrequency;

    /// @notice Duration (in seconds) over which the moving average is calculated.
    uint48 public movingAverageDuration;

    /// @notice Unix timestamp of last observation (in seconds).
    uint48 public lastObservationTime;

    /// @notice Whether the price module is initialized (and therefore active).
    bool public initialized;

    /// @notice Number of decimals in the price values provided by the contract.
    uint8 public constant decimals = 18;

    // =========  FUNCTIONS ========= //

    /// @notice Trigger an update of the moving average. Permissioned.
    /// @dev    This function does not have a time-gating on the observationFrequency on this contract. It is set on the Heart policy contract.
    ///         The Heart beat frequency should be set to the same value as the observationFrequency.
    function updateMovingAverage() external virtual;

    /// @notice Initialize the price module
    /// @notice Access restricted to activated policies
    /// @param  startObservations_ - Array of observations to initialize the moving average with. Must be of length numObservations.
    /// @param  lastObservationTime_ - Unix timestamp of last observation being provided (in seconds).
    /// @dev    This function must be called after the Price module is deployed to activate it and after updating the observationFrequency
    ///         or movingAverageDuration (in certain cases) in order for the Price module to function properly.
    function initialize(uint256[] memory startObservations_, uint48 lastObservationTime_)
        external
        virtual;

    /// @notice Change the moving average window (duration)
    /// @param  movingAverageDuration_ - Moving average duration in seconds, must be a multiple of observation frequency
    /// @dev    Changing the moving average duration will erase the current observations array
    ///         and require the initialize function to be called again. Ensure that you have saved
    ///         the existing data and can re-populate before calling this function.
    function changeMovingAverageDuration(uint48 movingAverageDuration_) external virtual;

    /// @notice   Change the observation frequency of the moving average (i.e. how often a new observation is taken)
    /// @param    observationFrequency_ - Observation frequency in seconds, must be a divisor of the moving average duration
    /// @dev      Changing the observation frequency clears existing observation data since it will not be taken at the right time intervals.
    ///           Ensure that you have saved the existing data and/or can re-populate before calling this function.
    function changeObservationFrequency(uint48 observationFrequency_) external virtual;

    /// @notice   Change the update thresholds for the price feeds
    /// @param    ohmEthUpdateThreshold_ - Maximum allowed time between OHM/ETH price feed updates
    /// @param    reserveEthUpdateThreshold_ - Maximum allowed time between Reserve/ETH price feed updates
    /// @dev      The update thresholds should be set based on the update threshold of the chainlink oracles.
    function changeUpdateThresholds(
        uint48 ohmEthUpdateThreshold_,
        uint48 reserveEthUpdateThreshold_
    ) external virtual;

    /// @notice Get the current price of OHM in the Reserve asset from the price feeds
    function getCurrentPrice() external view virtual returns (uint256);

    /// @notice Get the last stored price observation of OHM in the Reserve asset
    function getLastPrice() external view virtual returns (uint256);

    /// @notice Get the moving average of OHM in the Reserve asset over the defined window (see movingAverageDuration and observationFrequency).
    function getMovingAverage() external view virtual returns (uint256);
}

// File: src/modules/ROLES/OlympusRoles.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.15;

import {ROLESv1} from "src/modules/ROLES/ROLES.v1.sol";
import "src/Kernel.sol";

/// @notice Abstract contract to have the `onlyRole` modifier
/// @dev    Inheriting this automatically makes ROLES module a dependency
abstract contract RolesConsumer {
    ROLESv1 public ROLES;

    modifier onlyRole(bytes32 role_) {
        ROLES.requireRole(role_, msg.sender);
        _;
    }
}

/// @notice Module that holds multisig roles needed by various policies.
contract OlympusRoles is ROLESv1 {
    //============================================================================================//
    //                                        MODULE SETUP                                        //
    //============================================================================================//

    constructor(Kernel kernel_) Module(kernel_) {}

    /// @inheritdoc Module
    function KEYCODE() public pure override returns (Keycode) {
        return toKeycode("ROLES");
    }

    /// @inheritdoc Module
    function VERSION() external pure override returns (uint8 major, uint8 minor) {
        major = 1;
        minor = 0;
    }

    //============================================================================================//
    //                                       CORE FUNCTIONS                                       //
    //============================================================================================//

    /// @inheritdoc ROLESv1
    function saveRole(bytes32 role_, address addr_) external override permissioned {
        if (hasRole[addr_][role_]) revert ROLES_AddressAlreadyHasRole(addr_, role_);

        ensureValidRole(role_);

        // Grant role to the address
        hasRole[addr_][role_] = true;

        emit RoleGranted(role_, addr_);
    }

    /// @inheritdoc ROLESv1
    function removeRole(bytes32 role_, address addr_) external override permissioned {
        if (!hasRole[addr_][role_]) revert ROLES_AddressDoesNotHaveRole(addr_, role_);

        hasRole[addr_][role_] = false;

        emit RoleRevoked(role_, addr_);
    }

    //============================================================================================//
    //                                       VIEW FUNCTIONS                                       //
    //============================================================================================//

    /// @inheritdoc ROLESv1
    function requireRole(bytes32 role_, address caller_) external view override {
        if (!hasRole[caller_][role_]) revert ROLES_RequireRole(role_);
    }

    /// @inheritdoc ROLESv1
    function ensureValidRole(bytes32 role_) public pure override {
        for (uint256 i = 0; i < 32; ) {
            bytes1 char = role_[i];
            if ((char < 0x61 || char > 0x7A) && char != 0x5f && char != 0x00) {
                revert ROLES_InvalidRole(role_); // a-z only
            }
            unchecked {
                i++;
            }
        }
    }
}

// File: src/modules/ROLES/ROLES.v1.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity 0.8.15;

import "src/Kernel.sol";

abstract contract ROLESv1 is Module {
    // =========  EVENTS ========= //

    event RoleGranted(bytes32 indexed role_, address indexed addr_);
    event RoleRevoked(bytes32 indexed role_, address indexed addr_);

    // =========  ERRORS ========= //

    error ROLES_InvalidRole(bytes32 role_);
    error ROLES_RequireRole(bytes32 role_);
    error ROLES_AddressAlreadyHasRole(address addr_, bytes32 role_);
    error ROLES_AddressDoesNotHaveRole(address addr_, bytes32 role_);
    error ROLES_RoleDoesNotExist(bytes32 role_);

    // =========  STATE ========= //

    /// @notice Mapping for if an address has a policy-defined role.
    mapping(address => mapping(bytes32 => bool)) public hasRole;

    // =========  FUNCTIONS ========= //

    /// @notice Function to grant policy-defined roles to some address. Can only be called by admin.
    function saveRole(bytes32 role_, address addr_) external virtual;

    /// @notice Function to revoke policy-defined roles from some address. Can only be called by admin.
    function removeRole(bytes32 role_, address addr_) external virtual;

    /// @notice "Modifier" to restrict policy function access to certain addresses with a role.
    /// @dev    Roles are defined in the policy and granted by the ROLES admin.
    function requireRole(bytes32 role_, address caller_) external virtual;

    /// @notice Function that checks if role is valid (all lower case)
    function ensureValidRole(bytes32 role_) external pure virtual;
}

// File: src/policies/Heart.sol



// SPDX-License-Identifier: AGPL-3.0
pragma solidity 0.8.15;

import {ReentrancyGuard} from "solmate/utils/ReentrancyGuard.sol";
import {ERC20} from "solmate/tokens/ERC20.sol";

import {TransferHelper} from "libraries/TransferHelper.sol";

import {IOperator} from "policies/interfaces/IOperator.sol";
import {IHeart} from "policies/interfaces/IHeart.sol";

import {RolesConsumer} from "modules/ROLES/OlympusRoles.sol";
import {ROLESv1} from "modules/ROLES/ROLES.v1.sol";
import {PRICEv1} from "modules/PRICE/PRICE.v1.sol";

import "src/Kernel.sol";

/// @title  Olympus Heart
/// @notice Olympus Heart (Policy) Contract
/// @dev    The Olympus Heart contract provides keeper rewards to call the heart beat function which fuels
///         Olympus market operations. The Heart orchestrates state updates in the correct order to ensure
///         market operations use up to date information.
contract OlympusHeart is IHeart, Policy, RolesConsumer, ReentrancyGuard {
    using TransferHelper for ERC20;

    // =========  STATE ========= //

    /// @notice Status of the Heart, false = stopped, true = beating
    bool public active;

    /// @notice Timestamp of the last beat (UTC, in seconds)
    uint256 public lastBeat;

    /// @notice Reward for beating the Heart (in reward token decimals)
    uint256 public reward;

    /// @notice Reward token address that users are sent for beating the Heart
    ERC20 public rewardToken;

    // Modules
    PRICEv1 internal PRICE;

    // Policies
    IOperator internal _operator;

    //============================================================================================//
    //                                      POLICY SETUP                                          //
    //============================================================================================//

    constructor(
        Kernel kernel_,
        IOperator operator_,
        ERC20 rewardToken_,
        uint256 reward_
    ) Policy(kernel_) {
        _operator = operator_;

        active = true;
        lastBeat = block.timestamp;
        rewardToken = rewardToken_;
        reward = reward_;
    }

    /// @inheritdoc Policy
    function configureDependencies() external override returns (Keycode[] memory dependencies) {
        dependencies = new Keycode[](2);
        dependencies[0] = toKeycode("PRICE");
        dependencies[1] = toKeycode("ROLES");

        PRICE = PRICEv1(getModuleAddress(dependencies[0]));
        ROLES = ROLESv1(getModuleAddress(dependencies[1]));
    }

    /// @inheritdoc Policy
    function requestPermissions()
        external
        view
        override
        returns (Permissions[] memory permissions)
    {
        permissions = new Permissions[](1);
        permissions[0] = Permissions(PRICE.KEYCODE(), PRICE.updateMovingAverage.selector);
    }

    //============================================================================================//
    //                                       CORE FUNCTIONS                                       //
    //============================================================================================//

    /// @inheritdoc IHeart
    function beat() external nonReentrant {
        if (!active) revert Heart_BeatStopped();
        if (block.timestamp < lastBeat + frequency()) revert Heart_OutOfCycle();

        // Update the moving average on the Price module
        PRICE.updateMovingAverage();

        // Trigger price range update and market operations
        _operator.operate();

        // Update the last beat timestamp
        // Ensure that update frequency doesn't change, but do not allow multiple beats if one is skipped
        lastBeat = block.timestamp - ((block.timestamp - lastBeat) % frequency());

        // Issue reward to sender
        _issueReward(msg.sender);

        emit Beat(block.timestamp);
    }

    function _issueReward(address to_) internal {
        uint256 amount = reward > rewardToken.balanceOf(address(this))
            ? rewardToken.balanceOf(address(this))
            : reward;
        rewardToken.safeTransfer(to_, amount);
        emit RewardIssued(to_, amount);
    }

    //============================================================================================//
    //                                      ADMIN FUNCTIONS                                       //
    //============================================================================================//

    function _resetBeat() internal {
        lastBeat = block.timestamp - frequency();
    }

    /// @inheritdoc IHeart
    function resetBeat() external onlyRole("heart_admin") {
        _resetBeat();
    }

    /// @inheritdoc IHeart
    function activate() external onlyRole("heart_admin") {
        active = true;
        _resetBeat();
    }

    /// @inheritdoc IHeart
    function deactivate() external onlyRole("heart_admin") {
        active = false;
    }

    modifier notWhileBeatAvailable() {
        // Prevent calling if a beat is available to avoid front-running a keeper
        if (block.timestamp >= lastBeat + frequency()) revert Heart_BeatAvailable();
        _;
    }

    /// @inheritdoc IHeart
    function setRewardTokenAndAmount(ERC20 token_, uint256 reward_)
        external
        onlyRole("heart_admin")
        notWhileBeatAvailable
    {
        rewardToken = token_;
        reward = reward_;
        emit RewardUpdated(token_, reward_);
    }

    /// @inheritdoc IHeart
    function withdrawUnspentRewards(ERC20 token_)
        external
        onlyRole("heart_admin")
        notWhileBeatAvailable
    {
        token_.safeTransfer(msg.sender, token_.balanceOf(address(this)));
    }

    //============================================================================================//
    //                                       VIEW FUNCTIONS                                       //
    //============================================================================================//

    /// @inheritdoc IHeart
    function frequency() public view returns (uint256) {
        return uint256(PRICE.observationFrequency());
    }
}

// File: src/policies/interfaces/IHeart.sol



// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.0;

import {ERC20} from "solmate/tokens/ERC20.sol";

interface IHeart {
    // =========  EVENTS ========= //

    event Beat(uint256 timestamp_);
    event RewardIssued(address to_, uint256 rewardAmount_);
    event RewardUpdated(ERC20 token_, uint256 rewardAmount_);

    // =========  ERRORS ========= //

    error Heart_OutOfCycle();
    error Heart_BeatStopped();
    error Heart_InvalidParams();
    error Heart_BeatAvailable();

    // =========  CORE FUNCTIONS ========= //

    /// @notice Beats the heart
    /// @notice Only callable when enough time has passed since last beat (determined by frequency variable)
    /// @notice This function is incentivized with a token reward (see rewardToken and reward variables).
    /// @dev    Triggers price oracle update and market operations
    function beat() external;

    // =========  ADMIN FUNCTIONS ========= //

    /// @notice Unlocks the cycle if stuck on one side, eject function
    /// @notice Access restricted
    function resetBeat() external;

    /// @notice Turns the heart on and resets the beat
    /// @notice Access restricted
    /// @dev    This function is used to restart the heart after a pause
    function activate() external;

    /// @notice Turns the heart off
    /// @notice Access restricted
    /// @dev    Emergency stop function for the heart
    function deactivate() external;

    /// @notice Sets the reward token and amount for the beat function
    /// @notice Access restricted
    /// @param  token_ - New reward token address
    /// @param  reward_ - New reward amount, in units of the reward token
    function setRewardTokenAndAmount(ERC20 token_, uint256 reward_) external;

    /// @notice Withdraws unspent balance of provided token to sender
    /// @notice Access restricted
    function withdrawUnspentRewards(ERC20 token_) external;

    // =========  VIEW FUNCTIONS ========= //

    /// @notice Heart beat frequency, in seconds
    function frequency() external view returns (uint256);
}

// File: src/policies/interfaces/IOperator.sol



// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.0;

import {ERC20} from "solmate/tokens/ERC20.sol";
import {IBondSDA} from "interfaces/IBondSDA.sol";
import {IBondCallback} from "interfaces/IBondCallback.sol";

interface IOperator {
    // =========  EVENTS ========= //

    event Swap(
        ERC20 indexed tokenIn_,
        ERC20 indexed tokenOut_,
        uint256 amountIn_,
        uint256 amountOut_
    );
    event CushionFactorChanged(uint32 cushionFactor_);
    event CushionParamsChanged(uint32 duration_, uint32 debtBuffer_, uint32 depositInterval_);
    event ReserveFactorChanged(uint32 reserveFactor_);
    event RegenParamsChanged(uint32 wait_, uint32 threshold_, uint32 observe_);

    // =========  ERRORS ========= //

    error Operator_InvalidParams();
    error Operator_InsufficientCapacity();
    error Operator_AmountLessThanMinimum(uint256 amountOut, uint256 minAmountOut);
    error Operator_WallDown();
    error Operator_AlreadyInitialized();
    error Operator_NotInitialized();
    error Operator_Inactive();

    // =========  STRUCTS ========== //

    /// @notice Configuration variables for the Operator
    struct Config {
        uint32 cushionFactor; // percent of capacity to be used for a single cushion deployment, assumes 2 decimals (i.e. 1000 = 10%)
        uint32 cushionDuration; // duration of a single cushion deployment in seconds
        uint32 cushionDebtBuffer; // Percentage over the initial debt to allow the market to accumulate at any one time. Percent with 3 decimals, e.g. 1_000 = 1 %. See IBondSDA for more info.
        uint32 cushionDepositInterval; // Target frequency of deposits. Determines max payout of the bond market. See IBondSDA for more info.
        uint32 reserveFactor; // percent of reserves in treasury to be used for a single wall, assumes 2 decimals (i.e. 1000 = 10%)
        uint32 regenWait; // minimum duration to wait to reinstate a wall in seconds
        uint32 regenThreshold; // number of price points on other side of moving average to reinstate a wall
        uint32 regenObserve; // number of price points to observe to determine regeneration
    }

    /// @notice Combines regeneration status for low and high sides of the range
    struct Status {
        Regen low; // regeneration status for the low side of the range
        Regen high; // regeneration status for the high side of the range
    }

    /// @notice Tracks status of when a specific side of the range can be regenerated by the Operator
    struct Regen {
        uint32 count; // current number of price points that count towards regeneration
        uint48 lastRegen; // timestamp of the last regeneration
        uint32 nextObservation; // index of the next observation in the observations array
        bool[] observations; // individual observations: true = price on other side of average, false = price on same side of average
    }

    // =========  CORE FUNCTIONS ========= //

    /// @notice Executes market operations logic.
    /// @notice Access restricted
    /// @dev    This function is triggered by a keeper on the Heart contract.
    function operate() external;

    // =========  OPEN MARKET OPERATIONS (WALL) ========= //

    /// @notice Swap at the current wall prices
    /// @param  tokenIn_ - Token to swap into the wall
    ///         - OHM: swap at the low wall price for Reserve
    ///         - Reserve: swap at the high wall price for OHM
    /// @param  amountIn_ - Amount of tokenIn to swap
    /// @param  minAmountOut_ - Minimum amount of opposite token to receive
    /// @return amountOut - Amount of opposite token received
    function swap(
        ERC20 tokenIn_,
        uint256 amountIn_,
        uint256 minAmountOut_
    ) external returns (uint256 amountOut);

    /// @notice Returns the amount to be received from a swap
    /// @param  tokenIn_ - Token to swap into the wall
    ///         - If OHM: swap at the low wall price for Reserve
    ///         - If Reserve: swap at the high wall price for OHM
    /// @param  amountIn_ - Amount of tokenIn to swap
    /// @return Amount of opposite token received
    function getAmountOut(ERC20 tokenIn_, uint256 amountIn_) external view returns (uint256);

    // =========  ADMIN FUNCTIONS ========= //

    /// @notice Set the wall and cushion spreads
    /// @notice Access restricted
    /// @dev    Interface for externally setting these values on the RANGE module
    /// @param  cushionSpread_ - Percent spread to set the cushions at above/below the moving average, assumes 2 decimals (i.e. 1000 = 10%)
    /// @param  wallSpread_ - Percent spread to set the walls at above/below the moving average, assumes 2 decimals (i.e. 1000 = 10%)
    function setSpreads(uint256 cushionSpread_, uint256 wallSpread_) external;

    /// @notice Set the threshold factor for when a wall is considered "down"
    /// @notice Access restricted
    /// @dev    Interface for externally setting this value on the RANGE module
    /// @param  thresholdFactor_ - Percent of capacity that the wall should close below, assumes 2 decimals (i.e. 1000 = 10%)
    function setThresholdFactor(uint256 thresholdFactor_) external;

    /// @notice Set the cushion factor
    /// @notice Access restricted
    /// @param  cushionFactor_ - Percent of wall capacity that the operator will deploy in the cushion, assumes 2 decimals (i.e. 1000 = 10%)
    function setCushionFactor(uint32 cushionFactor_) external;

    /// @notice Set the parameters used to deploy cushion bond markets
    /// @notice Access restricted
    /// @param  duration_ - Duration of cushion bond markets in seconds
    /// @param  debtBuffer_ - Percentage over the initial debt to allow the market to accumulate at any one time. Percent with 3 decimals, e.g. 1_000 = 1 %. See IBondSDA for more info.
    /// @param  depositInterval_ - Target frequency of deposits in seconds. Determines max payout of the bond market. See IBondSDA for more info.
    function setCushionParams(
        uint32 duration_,
        uint32 debtBuffer_,
        uint32 depositInterval_
    ) external;

    /// @notice Set the reserve factor
    /// @notice Access restricted
    /// @param  reserveFactor_ - Percent of treasury reserves to deploy as capacity for market operations, assumes 2 decimals (i.e. 1000 = 10%)
    function setReserveFactor(uint32 reserveFactor_) external;

    /// @notice Set the wall regeneration parameters
    /// @notice Access restricted
    /// @param  wait_ - Minimum duration to wait to reinstate a wall in seconds
    /// @param  threshold_ - Number of price points on other side of moving average to reinstate a wall
    /// @param  observe_ - Number of price points to observe to determine regeneration
    /// @dev    We must see Threshold number of price points that meet our criteria within the last Observe number of price points to regenerate a wall.
    function setRegenParams(
        uint32 wait_,
        uint32 threshold_,
        uint32 observe_
    ) external;

    /// @notice Set the contracts that the Operator deploys bond markets with.
    /// @notice Access restricted
    /// @param  auctioneer_ - Address of the bond auctioneer to use.
    /// @param  callback_ - Address of the callback to use.
    function setBondContracts(IBondSDA auctioneer_, IBondCallback callback_) external;

    /// @notice Initialize the Operator to begin market operations
    /// @notice Access restricted
    /// @notice Can only be called once
    /// @dev    This function executes actions required to start operations that cannot be done prior to the Operator policy being approved by the Kernel.
    function initialize() external;

    /// @notice Regenerate the wall for a side
    /// @notice Access restricted
    /// @param  high_ Whether to regenerate the high side or low side (true = high, false = low)
    /// @dev    This function is an escape hatch to trigger out of cycle regenerations and may be useful when doing migrations of Treasury funds
    function regenerate(bool high_) external;

    /// @notice Deactivate the Operator
    /// @notice Access restricted
    /// @dev    Emergency pause function for the Operator. Prevents market operations from occurring.
    function deactivate() external;

    /// @notice Activate the Operator
    /// @notice Access restricted
    /// @dev    Restart function for the Operator after a pause.
    function activate() external;

    /// @notice Manually close a cushion bond market
    /// @notice Access restricted
    /// @param  high_ Whether to deactivate the high or low side cushion (true = high, false = low)
    /// @dev    Emergency shutdown function for Cushions
    function deactivateCushion(bool high_) external;

    // =========  VIEW FUNCTIONS ========= //

    /// @notice Returns the full capacity of the specified wall (if it was regenerated now)
    /// @dev    Calculates the capacity to deploy for a wall based on the amount of reserves owned by the treasury and the reserve factor.
    /// @param  high_ - Whether to return the full capacity for the high or low wall
    function fullCapacity(bool high_) external view returns (uint256);

    /// @notice Returns the status variable of the Operator as a Status struct
    function status() external view returns (Status memory);

    /// @notice Returns the config variable of the Operator as a Config struct
    function config() external view returns (Config memory);
}