wip

contracts/math/MultiplierPointCalculator.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.18;
+
+import { Math } from "@openzeppelin/contracts/utils/math/Math.sol";
+
+type MultiplierPoints is uint256;
+
+using { add as + } for MultiplierPoints global;
+using { sub as - } for MultiplierPoints global;
+using { lt as < } for MultiplierPoints global;
+using { gt as > } for MultiplierPoints global;
+
+function add(MultiplierPoints a, MultiplierPoints b) pure returns (MultiplierPoints) {
+    return MultiplierPoints.wrap(MultiplierPoints.unwrap(a) + MultiplierPoints.unwrap(b));
+}
+
+function sub(MultiplierPoints a, MultiplierPoints b) pure returns (MultiplierPoints) {
+    return MultiplierPoints.wrap(MultiplierPoints.unwrap(a) - MultiplierPoints.unwrap(b));
+}
+
+function lt(MultiplierPoints a, MultiplierPoints b) pure returns (bool) {
+    return MultiplierPoints.unwrap(a) < MultiplierPoints.unwrap(b);
+}
+
+function gt(MultiplierPoints a, MultiplierPoints b) pure returns (bool) {
+    return MultiplierPoints.unwrap(a) > MultiplierPoints.unwrap(b);
+}
+
+library MultiplierPointsCalculator {
+    uint256 constant MAX_BOOST = 4;
+    uint256 constant YEAR = 365 days;
+    uint256 constant MP_APY = 1;
+
+    /**
+     * @notice Calculates maximum multiplier point increase for given balance
+     * @param _mpToMint tested value
+     * @param _balance balance of account
+     * @param _totalMP total multiplier point of the account
+     * @param _bonusMP bonus multiplier point of the account
+     * @return _maxMpToMint maximum multiplier points to mint
+     */
+    function getMaxMPToMint(
+        MultiplierPoints _mpToMint,
+        uint256 _balance,
+        MultiplierPoints _bonusMP,
+        MultiplierPoints _totalMP
+    )
+        private
+        pure
+        returns (MultiplierPoints _maxMpToMint)
+    {
+        // Maximum multiplier point for given balance
+        _maxMpToMint = getMPToMint(_balance, MAX_BOOST * YEAR) + _bonusMP;
+        if (_mpToMint + _totalMP > _maxMpToMint) {
+            //reached cap when increasing MP
+            return _maxMpToMint - _totalMP; //how much left to reach cap
+        } else {
+            //not reached capw hen increasing MP
+            return _mpToMint; //just return tested value
+        }
+    }
+
+    /**
+     * @notice Calculates multiplier points to mint for given balance and time
+     * @param _balance balance of account
+     * @param _deltaTime time difference
+     * @return multiplier points to mint
+     */
+    function getMPToMint(uint256 _balance, uint256 _deltaTime) private pure returns (MultiplierPoints) {
+        return MultiplierPoints.wrap(Math.mulDiv(_balance, _deltaTime, YEAR) * MP_APY);
+    }
+}