include_guard(GLOBAL)
include(CMakeParseArguments)

# Native integration helper for a module located inside the BastionGuard tree.
# It uses add_subdirectory(); it does not create an ExternalProject.
#
# Example (after add_executable(BastionGuard ...)):
#   include(src/rootguard/cmake/BastionGuardRootGuard.cmake)
#   bastionguard_enable_rootguard(
#       TARGET BastionGuard
#       SOURCE_DIR "${CMAKE_SOURCE_DIR}/src/rootguard"
#       BINARY_DIR "${CMAKE_BINARY_DIR}/bastionguard-rootguard-build"
#   )
function(bastionguard_enable_rootguard)
    set(options BUILD_TESTS)
    set(oneValueArgs TARGET SOURCE_DIR BINARY_DIR INIT_SYSTEM BTF)
    cmake_parse_arguments(RG "${options}" "${oneValueArgs}" "" ${ARGN})

    if(NOT RG_TARGET OR NOT TARGET ${RG_TARGET})
        message(FATAL_ERROR
            "bastionguard_enable_rootguard requires TARGET naming an existing target")
    endif()
    if(NOT RG_SOURCE_DIR)
        set(RG_SOURCE_DIR "${CMAKE_SOURCE_DIR}/src/rootguard")
    endif()
    if(NOT RG_BINARY_DIR)
        set(RG_BINARY_DIR "${CMAKE_BINARY_DIR}/bastionguard-rootguard-build")
    endif()
    if(NOT RG_INIT_SYSTEM)
        # Preserve an init system explicitly selected by the parent project or
        # distribution packaging (for example -DROOTGUARD_INIT_SYSTEM=systemd).
        # Fall back to auto-detection only when no explicit value was supplied.
        if(DEFINED ROOTGUARD_INIT_SYSTEM AND
           NOT "${ROOTGUARD_INIT_SYSTEM}" STREQUAL "")
            set(RG_INIT_SYSTEM "${ROOTGUARD_INIT_SYSTEM}")
        else()
            set(RG_INIT_SYSTEM auto)
        endif()
    endif()
    if(NOT RG_BTF)
        set(RG_BTF /sys/kernel/btf/vmlinux)
    endif()

    if(NOT EXISTS "${RG_SOURCE_DIR}/CMakeLists.txt")
        message(FATAL_ERROR
            "RootGuard module not found: ${RG_SOURCE_DIR}/CMakeLists.txt")
    endif()

    set(ROOTGUARD_BUILD_DAEMON ON CACHE BOOL "" FORCE)
    set(ROOTGUARD_BUILD_GTK_PAGE ON CACHE BOOL "" FORCE)
    set(ROOTGUARD_BUILD_GTK_DEMO OFF CACHE BOOL "" FORCE)
    set(ROOTGUARD_BUILD_TESTS ${RG_BUILD_TESTS} CACHE BOOL "" FORCE)
    set(ROOTGUARD_INIT_SYSTEM "${RG_INIT_SYSTEM}" CACHE STRING "" FORCE)
    set(ROOTGUARD_VMLINUX_BTF "${RG_BTF}" CACHE FILEPATH "" FORCE)

    if(NOT TARGET BastionGuard::RootGuardUI)
        add_subdirectory("${RG_SOURCE_DIR}" "${RG_BINARY_DIR}")
    endif()

    target_link_libraries(${RG_TARGET} PRIVATE BastionGuard::RootGuardUI)
    if(TARGET bastionguard-rootguard)
        add_dependencies(${RG_TARGET} bastionguard-rootguard)
    endif()
    if(TARGET bastionguard-rootguard-action)
        add_dependencies(${RG_TARGET} bastionguard-rootguard-action)
    endif()
endfunction()