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

/// @title Contract to be inherited by contracts that will derive
/// AccessControlRegistry roles
/// @notice If a contract interfaces with AccessControlRegistry and needs to
/// derive roles, it should inherit this contract instead of re-implementing
/// the logic
contract RoleDeriver {
    /// @notice Derives the root role of the manager
    /// @param manager Manager address
    /// @return rootRole Root role
    function _deriveRootRole(
        address manager
    ) internal pure returns (bytes32 rootRole) {
        rootRole = keccak256(abi.encodePacked(manager));
    }

    /// @notice Derives the role using its admin role and description
    /// @dev This implies that roles adminned by the same role cannot have the
    /// same description
    /// @param adminRole Admin role
    /// @param description Human-readable description of the role
    /// @return role Role
    function _deriveRole(
        bytes32 adminRole,
        string memory description
    ) internal pure returns (bytes32 role) {
        role = _deriveRole(adminRole, keccak256(abi.encodePacked(description)));
    }

    /// @notice Derives the role using its admin role and description hash
    /// @dev This implies that roles adminned by the same role cannot have the
    /// same description
    /// @param adminRole Admin role
    /// @param descriptionHash Hash of the human-readable description of the
    /// role
    /// @return role Role
    function _deriveRole(
        bytes32 adminRole,
        bytes32 descriptionHash
    ) internal pure returns (bytes32 role) {
        role = keccak256(abi.encodePacked(adminRole, descriptionHash));
    }
}