// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.25;

import { TimeManagerV8 } from "@venusprotocol/solidity-utilities/contracts/TimeManagerV8.sol";
import { InterestRateModel } from "./InterestRateModel.sol";
import { EXP_SCALE, MANTISSA_ONE } from "./lib/constants.sol";

/**
 * @title TwoKinksInterestRateModel
 * @author Venus
 * @notice An interest rate model with two different slope increase or decrease each after a certain utilization threshold called **kink** is reached.
 */
contract TwoKinksInterestRateModel is InterestRateModel, TimeManagerV8 {
    ////////////////////// SLOPE 1 //////////////////////

    /**
     * @notice The multiplier of utilization rate per block or second that gives the slope 1 of the interest rate scaled by EXP_SCALE
     */
    int256 public immutable MULTIPLIER_PER_BLOCK_OR_SECOND;

    /**
     * @notice The base interest rate per block or second which is the y-intercept when utilization rate is 0 scaled by EXP_SCALE
     */
    int256 public immutable BASE_RATE_PER_BLOCK_OR_SECOND;

    ////////////////////// SLOPE 2 //////////////////////

    /**
     * @notice The utilization point at which the multiplier2 is applied
     */
    int256 public immutable KINK_1;

    /**
     * @notice The multiplier of utilization rate per block or second that gives the slope 2 of the interest rate scaled by EXP_SCALE
     */
    int256 public immutable MULTIPLIER_2_PER_BLOCK_OR_SECOND;

    /**
     * @notice The base interest rate per block or second which is the y-intercept when utilization rate hits KINK_1 scaled by EXP_SCALE
     */
    int256 public immutable BASE_RATE_2_PER_BLOCK_OR_SECOND;

    /**
     * @notice The maximum kink interest rate scaled by EXP_SCALE
     */
    int256 public immutable RATE_1;

    ////////////////////// SLOPE 3 //////////////////////

    /**
     * @notice The utilization point at which the jump multiplier is applied
     */
    int256 public immutable KINK_2;

    /**
     * @notice The multiplier of utilization rate per block or second that gives the slope 3 of interest rate scaled by EXP_SCALE
     */
    int256 public immutable JUMP_MULTIPLIER_PER_BLOCK_OR_SECOND;

    /**
     * @notice The maximum kink interest rate scaled by EXP_SCALE
     */
    int256 public immutable RATE_2;

    /**
     * @notice Thrown when a negative value is not allowed
     */
    error NegativeValueNotAllowed();

    /**
     * @notice Thrown when the kink points are not in the correct order
     */
    error InvalidKink();

    /**
     * @notice Construct an interest rate model
     * @param baseRatePerYear_ The approximate target base APR, as a mantissa (scaled by EXP_SCALE)
     * @param multiplierPerYear_ The rate of increase or decrease in interest rate wrt utilization (scaled by EXP_SCALE)
     * @param kink1_ The utilization point at which the multiplier2 is applied
     * @param multiplier2PerYear_ The rate of increase or decrease in interest rate wrt utilization after hitting KINK_1 (scaled by EXP_SCALE)
     * @param baseRate2PerYear_ The additonal base APR after hitting KINK_1, as a mantissa (scaled by EXP_SCALE)
     * @param kink2_ The utilization point at which the jump multiplier is applied
     * @param jumpMultiplierPerYear_ The multiplier after hitting KINK_2
     * @param timeBased_ A boolean indicating whether the contract is based on time or block.
     * @param blocksPerYear_ The number of blocks per year
     */
    constructor(
        int256 baseRatePerYear_,
        int256 multiplierPerYear_,
        int256 kink1_,
        int256 multiplier2PerYear_,
        int256 baseRate2PerYear_,
        int256 kink2_,
        int256 jumpMultiplierPerYear_,
        bool timeBased_,
        uint256 blocksPerYear_
    ) TimeManagerV8(timeBased_, blocksPerYear_) {
        if (baseRatePerYear_ < 0 || baseRate2PerYear_ < 0) {
            revert NegativeValueNotAllowed();
        }

        if (kink2_ <= kink1_ || kink1_ <= 0) {
            revert InvalidKink();
        }

        int256 blocksOrSecondsPerYear_ = int256(blocksOrSecondsPerYear);
        BASE_RATE_PER_BLOCK_OR_SECOND = baseRatePerYear_ / blocksOrSecondsPerYear_;
        MULTIPLIER_PER_BLOCK_OR_SECOND = multiplierPerYear_ / blocksOrSecondsPerYear_;
        KINK_1 = kink1_;
        MULTIPLIER_2_PER_BLOCK_OR_SECOND = multiplier2PerYear_ / blocksOrSecondsPerYear_;
        BASE_RATE_2_PER_BLOCK_OR_SECOND = baseRate2PerYear_ / blocksOrSecondsPerYear_;
        KINK_2 = kink2_;
        JUMP_MULTIPLIER_PER_BLOCK_OR_SECOND = jumpMultiplierPerYear_ / blocksOrSecondsPerYear_;

        int256 expScale = int256(EXP_SCALE);
        RATE_1 = (((KINK_1 * MULTIPLIER_PER_BLOCK_OR_SECOND) / expScale) + BASE_RATE_PER_BLOCK_OR_SECOND);

        int256 slope2Util;
        unchecked {
            slope2Util = KINK_2 - KINK_1;
        }
        RATE_2 = ((slope2Util * MULTIPLIER_2_PER_BLOCK_OR_SECOND) / expScale) + BASE_RATE_2_PER_BLOCK_OR_SECOND;
    }

    /**
     * @notice Calculates the current borrow rate per slot (block or second)
     * @param cash The amount of cash in the market
     * @param borrows The amount of borrows in the market
     * @param reserves The amount of reserves in the market
     * @param badDebt The amount of badDebt in the market
     * @return The borrow rate percentage per slot (block or second) as a mantissa (scaled by EXP_SCALE)
     */
    function getBorrowRate(
        uint256 cash,
        uint256 borrows,
        uint256 reserves,
        uint256 badDebt
    ) external view override returns (uint256) {
        return _getBorrowRate(cash, borrows, reserves, badDebt);
    }

    /**
     * @notice Calculates the current supply rate per slot (block or second)
     * @param cash The amount of cash in the market
     * @param borrows The amount of borrows in the market
     * @param reserves The amount of reserves in the market
     * @param reserveFactorMantissa The current reserve factor for the market
     * @param badDebt The amount of badDebt in the market
     * @return The supply rate percentage per slot (block or second) as a mantissa (scaled by EXP_SCALE)
     */
    function getSupplyRate(
        uint256 cash,
        uint256 borrows,
        uint256 reserves,
        uint256 reserveFactorMantissa,
        uint256 badDebt
    ) public view virtual override returns (uint256) {
        uint256 oneMinusReserveFactor = MANTISSA_ONE - reserveFactorMantissa;
        uint256 borrowRate = _getBorrowRate(cash, borrows, reserves, badDebt);
        uint256 rateToPool = (borrowRate * oneMinusReserveFactor) / EXP_SCALE;
        uint256 incomeToDistribute = borrows * rateToPool;
        uint256 supply = cash + borrows + badDebt - reserves;
        return incomeToDistribute / supply;
    }

    /**
     * @notice Calculates the utilization rate of the market: `(borrows + badDebt) / (cash + borrows + badDebt - reserves)`
     * @param cash The amount of cash in the market
     * @param borrows The amount of borrows in the market
     * @param reserves The amount of reserves in the market (currently unused)
     * @param badDebt The amount of badDebt in the market
     * @return The utilization rate as a mantissa between [0, MANTISSA_ONE]
     */
    function utilizationRate(
        uint256 cash,
        uint256 borrows,
        uint256 reserves,
        uint256 badDebt
    ) public pure returns (uint256) {
        // Utilization rate is 0 when there are no borrows and badDebt
        if ((borrows + badDebt) == 0) {
            return 0;
        }

        uint256 rate = ((borrows + badDebt) * EXP_SCALE) / (cash + borrows + badDebt - reserves);

        if (rate > EXP_SCALE) {
            rate = EXP_SCALE;
        }

        return rate;
    }

    /**
     * @notice Calculates the current borrow rate per slot (block or second), with the error code expected by the market
     * @param cash The amount of cash in the market
     * @param borrows The amount of borrows in the market
     * @param reserves The amount of reserves in the market
     * @param badDebt The amount of badDebt in the market
     * @return The borrow rate percentage per slot (block or second) as a mantissa (scaled by EXP_SCALE)
     */
    function _getBorrowRate(
        uint256 cash,
        uint256 borrows,
        uint256 reserves,
        uint256 badDebt
    ) internal view returns (uint256) {
        int256 util = int256(utilizationRate(cash, borrows, reserves, badDebt));
        int256 expScale = int256(EXP_SCALE);

        if (util < KINK_1) {
            return _minCap(((util * MULTIPLIER_PER_BLOCK_OR_SECOND) / expScale) + BASE_RATE_PER_BLOCK_OR_SECOND);
        } else if (util < KINK_2) {
            int256 slope2Util;
            unchecked {
                slope2Util = util - KINK_1;
            }
            int256 rate2 = ((slope2Util * MULTIPLIER_2_PER_BLOCK_OR_SECOND) / expScale) +
                BASE_RATE_2_PER_BLOCK_OR_SECOND;

            return _minCap(RATE_1 + rate2);
        } else {
            int256 slope3Util;
            unchecked {
                slope3Util = util - KINK_2;
            }
            int256 rate3 = ((slope3Util * JUMP_MULTIPLIER_PER_BLOCK_OR_SECOND) / expScale);

            return _minCap(RATE_1 + RATE_2 + rate3);
        }
    }

    /**
     * @notice Returns 0 if number is less than 0, otherwise returns the input
     * @param number The first number
     * @return The maximum of 0 and input number
     */
    function _minCap(int256 number) internal pure returns (uint256) {
        int256 zero;
        return uint256(number > zero ? number : zero);
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.25;

import { SECONDS_PER_YEAR } from "./constants.sol";

abstract contract TimeManagerV8 {
    /// @notice Stores blocksPerYear if isTimeBased is true else secondsPerYear is stored
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    uint256 public immutable blocksOrSecondsPerYear;

    /// @notice Acknowledges if a contract is time based or not
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    bool public immutable isTimeBased;

    /// @notice Stores the current block timestamp or block number depending on isTimeBased
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    function() view returns (uint256) private immutable _getCurrentSlot;

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[48] private __gap;

    /// @notice Thrown when blocks per year is invalid
    error InvalidBlocksPerYear();

    /// @notice Thrown when time based but blocks per year is provided
    error InvalidTimeBasedConfiguration();

    /**
     * @param timeBased_ A boolean indicating whether the contract is based on time or block
     * If timeBased is true than blocksPerYear_ param is ignored as blocksOrSecondsPerYear is set to SECONDS_PER_YEAR
     * @param blocksPerYear_ The number of blocks per year
     * @custom:error InvalidBlocksPerYear is thrown if blocksPerYear entered is zero and timeBased is false
     * @custom:error InvalidTimeBasedConfiguration is thrown if blocksPerYear entered is non zero and timeBased is true
     * @custom:oz-upgrades-unsafe-allow constructor
     */
    constructor(bool timeBased_, uint256 blocksPerYear_) {
        if (!timeBased_ && blocksPerYear_ == 0) {
            revert InvalidBlocksPerYear();
        }

        if (timeBased_ && blocksPerYear_ != 0) {
            revert InvalidTimeBasedConfiguration();
        }

        isTimeBased = timeBased_;
        blocksOrSecondsPerYear = timeBased_ ? SECONDS_PER_YEAR : blocksPerYear_;
        _getCurrentSlot = timeBased_ ? _getBlockTimestamp : _getBlockNumber;
    }

    /**
     * @dev Function to simply retrieve block number or block timestamp
     * @return Current block number or block timestamp
     */
    function getBlockNumberOrTimestamp() public view virtual returns (uint256) {
        return _getCurrentSlot();
    }

    /**
     * @dev Returns the current timestamp in seconds
     * @return The current timestamp
     */
    function _getBlockTimestamp() private view returns (uint256) {
        return block.timestamp;
    }

    /**
     * @dev Returns the current block number
     * @return The current block number
     */
    function _getBlockNumber() private view returns (uint256) {
        return block.number;
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.25;

/// @dev Base unit for computations, usually used in scaling (multiplications, divisions)
uint256 constant EXP_SCALE = 1e18;

/// @dev A unit (literal one) in EXP_SCALE, usually used in additions/subtractions
uint256 constant MANTISSA_ONE = EXP_SCALE;

/// @dev The approximate number of seconds per year
uint256 constant SECONDS_PER_YEAR = 31_536_000;

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.8.25;

/**
 * @title Compound's InterestRateModel Interface
 * @author Compound
 */
abstract contract InterestRateModel {
    /**
     * @notice Calculates the current borrow interest rate per slot (block or second)
     * @param cash The total amount of cash the market has
     * @param borrows The total amount of borrows the market has outstanding
     * @param reserves The total amount of reserves the market has
     * @param badDebt The amount of badDebt in the market
     * @return The borrow rate percentage per slot (block or second) as a mantissa (scaled by EXP_SCALE)
     */
    function getBorrowRate(
        uint256 cash,
        uint256 borrows,
        uint256 reserves,
        uint256 badDebt
    ) external view virtual returns (uint256);

    /**
     * @notice Calculates the current supply interest rate per slot (block or second)
     * @param cash The total amount of cash the market has
     * @param borrows The total amount of borrows the market has outstanding
     * @param reserves The total amount of reserves the market has
     * @param reserveFactorMantissa The current reserve factor the market has
     * @param badDebt The amount of badDebt in the market
     * @return The supply rate percentage per slot (block or second) as a mantissa (scaled by EXP_SCALE)
     */
    function getSupplyRate(
        uint256 cash,
        uint256 borrows,
        uint256 reserves,
        uint256 reserveFactorMantissa,
        uint256 badDebt
    ) external view virtual returns (uint256);

    /**
     * @notice Indicator that this is an InterestRateModel contract (for inspection)
     * @return Always true
     */
    function isInterestRateModel() external pure virtual returns (bool) {
        return true;
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity ^0.8.25;

/// @dev The approximate number of seconds per year
uint256 constant SECONDS_PER_YEAR = 31_536_000;

/// @dev Base unit for computations, usually used in scaling (multiplications, divisions)
uint256 constant EXP_SCALE = 1e18;

/// @dev A unit (literal one) in EXP_SCALE, usually used in additions/subtractions
uint256 constant MANTISSA_ONE = EXP_SCALE;

{
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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