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// SPDX-License-Identifier: BUSL-1.1
// Last deployed from commit: b75e073cf23a3eb181f55a89a800ef040b7ba456;
pragma solidity 0.8.17;

import "@openzeppelin/contracts/access/Ownable.sol";
import "../../interfaces/IRatesCalculator.sol";

/**
 * @title WethVariableUtilisationRatesCalculator
 * @dev Contract which calculates the interest rates based on pool utilisation.
 * Utilisation is computed as the ratio between funds borrowed and funds deposited to the pool.
 * Borrowing rates are calculated using a piecewise linear function. The first piece is defined by SLOPE_1
 * and OFFSET (shift). Second piece is defined by SLOPE_2 (calculated off-chain), BREAKPOINT (threshold value above
 * which second piece is considered) and MAX_RATE (value at pool utilisation of 1).
 **/
contract WethVariableUtilisationRatesCalculator is IRatesCalculator, Ownable {
    uint256 public constant SLOPE_1 = 0.05e18;
    uint256 public constant OFFSET_1 = 0;

    uint256 public constant BREAKPOINT_1 = 0.6e18;

    uint256 public constant SLOPE_2 = 0.2e18;
    //negative, hence minus in calculations
    uint256 public constant OFFSET_2 = 0.09e18;

    uint256 public constant BREAKPOINT_2 = 0.8e18;

    uint256 public constant SLOPE_3 = 0.5e18;
    //negative, hence minus in calculations
    uint256 public constant OFFSET_3 = 0.33e18;

    // BREAKPOINT must be lower than 1e18

    uint256 public constant BREAKPOINT_3 = 0.9e18;

    uint256 public constant SLOPE_4= 29.8e18;
    //negative, hence minus in calculations
    uint256 public constant OFFSET_4 = 26.7e18;

    uint256 public constant MAX_RATE = 3.1e18;




    //residual spread to account for arithmetic inaccuracies in calculation of deposit rate. Does not result in any meaningful
    //profit generation
    uint256 public spread = 1e12;

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

    /**
     * Returns the pool utilisation, which is a ratio between loans and deposits
     * utilisation = value_of_loans / value_of_deposits
     * @dev _totalLoans total value of loans
     * @dev _totalDeposits total value of deposits
     **/
    function getPoolUtilisation(uint256 _totalLoans, uint256 _totalDeposits) public pure returns (uint256) {
        if (_totalDeposits == 0) return 0;

        return (_totalLoans * 1e18) / _totalDeposits;
    }

    /**
     * Returns the current deposit rate
     * The value is based on the current borrowing rate and satisfies the invariant:
     * value_of_loans * borrowing_rate = value_of_deposits * deposit_rate
     * @dev _totalLoans total value of loans
     * @dev _totalDeposits total value of deposits
     **/
    function calculateDepositRate(uint256 _totalLoans, uint256 _totalDeposits) external view override returns (uint256) {
        if (_totalDeposits == 0) return 0;

        if (_totalLoans >= _totalDeposits) {
            return MAX_RATE * (1e18 - spread) / 1e18;
        } else {
            uint256 rate = this.calculateBorrowingRate(_totalLoans, _totalDeposits) * (1e18 - spread) * _totalLoans / (_totalDeposits * 1e18);
            return rate;
        }
    }

    /**
     * Returns the current borrowing rate
     * The value is based on the pool utilisation according to the piecewise linear formula:
     * 1) for pool utilisation lower than or equal to breakpoint:
     * borrowing_rate = SLOPE_1 * utilisation + OFFSET
     * 2) for pool utilisation greater than breakpoint:
     * borrowing_rate = SLOPE_2 * utilisation + MAX_RATE - SLOPE_2
     * @dev _totalLoans total value of loans
     * @dev _totalDeposits total value of deposits
     **/
    function calculateBorrowingRate(uint256 totalLoans, uint256 totalDeposits) external pure override returns (uint256) {
        if (totalDeposits == 0) return OFFSET_1;

        uint256 poolUtilisation = getPoolUtilisation(totalLoans, totalDeposits);

        if (poolUtilisation >= 1e18) {
            return MAX_RATE;
        } else if (poolUtilisation <= BREAKPOINT_1) {
            return (poolUtilisation * SLOPE_1) / 1e18 + OFFSET_1;
        } else if (poolUtilisation <= BREAKPOINT_2) {
            return (poolUtilisation * SLOPE_2) / 1e18 - OFFSET_2;
        } else if (poolUtilisation <= BREAKPOINT_3) {
            return (poolUtilisation * SLOPE_3) / 1e18 - OFFSET_3;
        } else {
            // full formula derived from piecewise linear function calculation except for SLOPE_2/3/4 subtraction (separated for
            // unsigned integer safety check)
            return (poolUtilisation * SLOPE_4) / 1e18 - OFFSET_4;
        }
    }

    /* ========== SETTERS ========== */
    /**
     * Sets the spread between deposit and borrow rate, number between 0 and 1e18
     * @param _spread spread defined by user
     **/
    function setSpread(uint256 _spread) external onlyOwner {
        require(_spread < 1e18, "Spread must be smaller than 1e18");
        spread = _spread;
        emit SpreadChanged(msg.sender, _spread, block.timestamp);
    }

    /* ========== OVERRIDDEN FUNCTIONS ========== */

    function renounceOwnership() public virtual override {}

    /* ========== EVENTS ========== */

    /**
     * @dev emitted after changing the spread
     * @param performer an address of wallet setting a new spread
     * @param newSpread new spread
     * @param timestamp time of a spread change
     **/
    event SpreadChanged(address indexed performer, uint256 newSpread, uint256 timestamp);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: BUSL-1.1
// Last deployed from commit: ;
pragma solidity 0.8.17;

/**
 * @title IRatesCalculator
 * @dev Interface defining base method for contracts implementing interest rates calculation.
 * The calculated value could be based on the relation between funds borrowed and deposited.
 */
interface IRatesCalculator {
    function calculateBorrowingRate(uint256 totalLoans, uint256 totalDeposits) external view returns (uint256);

    function calculateDepositRate(uint256 totalLoans, uint256 totalDeposits) external view returns (uint256);
}

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

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