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

pragma solidity ^0.8;

struct Rebase {
    uint128 elastic;
    uint128 base;
}

/// @notice A rebasing library
library RebaseLibrary {
    /// @notice Calculates the base value in relationship to `elastic` and `total`.
    function toBase(Rebase memory total, uint256 elastic) internal pure returns (uint256 base) {
        if (total.elastic == 0) {
            base = elastic;
        } else {
            base = (elastic * total.base) / total.elastic;
        }
    }

    /// @notice Calculates the elastic value in relationship to `base` and `total`.
    function toElastic(Rebase memory total, uint256 base) internal pure returns (uint256 elastic) {
        if (total.base == 0) {
            elastic = base;
        } else {
            elastic = (base * total.elastic) / total.base;
        }
    }
}