cmake_minimum_required(VERSION 3.15)

project(Nuklear VERSION 0.0.1 LANGUAGES C)

#===============#
# Compiler args #
#===============#

set(CMAKE_C_VISIBILITY_PRESET hidden)
set(CMAKE_VISIBILITY_INLINES_HIDDEN YES)
set(CMAKE_C_STANDARD 90)

add_library("${PROJECT_NAME}_compiler_flags" INTERFACE)
target_compile_features("${PROJECT_NAME}_compiler_flags" INTERFACE "c_std_${CMAKE_C_STANDARD}")

# add compiler warning flags just when building this project via
# the BUILD_INTERFACE genex
set(gcc_like "$<COMPILE_LANG_AND_ID:C,CXX,ARMClang,AppleClang,Clang,GNU,LCC>")
set(msvc "$<COMPILE_LANG_AND_ID:C,CXX,MSVC>")
target_compile_options(
        "${PROJECT_NAME}_compiler_flags"
        INTERFACE
        "$<${gcc_like}:$<BUILD_INTERFACE:-Wall;-Wextra;-pedantic;-Wno-misleading-indentation;-Wno-shift-negative-value;-O2>>"
        "$<${msvc}:$<BUILD_INTERFACE:-W3;-WX;-Zi;-permissive->>"
)

# Set the build directories
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/bin")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib")

#===========#
# Configure #
#===========#

# configure a header file to pass the version number only
configure_file(
        "${CMAKE_CURRENT_SOURCE_DIR}/cmake/config.h.in"
        "${PROJECT_NAME}Config.h"
)

#=============#
# Sub-targets #
#=============#

option(BUILD_HEADER_ONLY "Header only variant" "ON")
option(BUILD_DEMOS "Build demos" "ON")
option(BUILD_EXAMPLES "Build examples" "ON")

add_subdirectory("src")
if (BUILD_DEMOS)
    add_subdirectory("demo")
endif (BUILD_DEMOS)
if (BUILD_EXAMPLES)
    add_subdirectory("example")
endif (BUILD_EXAMPLES)

include(CTest)
if (BUILD_TESTING)
    #add_subdirectory("tests")
endif (BUILD_TESTING)

#=========#
# Install #
#=========#

include(GNUInstallDirs)
install(FILES "${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.h"
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/nuklear")
include(InstallRequiredSystemLibraries)
set(CPACK_BUNDLE_NAME "${PROJECT_NAME}")
set(CPACK_PACKAGE_VENDOR "Micha Mettke")
set(CPACK_PACKAGE_DESCRIPTION "A single-header ANSI C immediate mode cross-platform GUI library")
set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "${CPACK_PACKAGE_DESCRIPTION_SUMMARY}")
if (APPLE)
    set(CPACK_BUNDLE_PLIST "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Info.plist")
    set(CPACK_BUNDLE_ICON "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Info.plist")
    set(CPACK_PACKAGE_ICON "${CMAKE_CURRENT_SOURCE_DIR}/cmake/CustomVolumeIcon.icns")
endif (APPLE)
set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/src/LICENSE")
set(CPACK_PACKAGE_VERSION_MAJOR "${${PROJECT_NAME}_VERSION_MAJOR}")
set(CPACK_PACKAGE_VERSION_MINOR "${${PROJECT_NAME}_VERSION_MINOR}")
set(CPACK_RESOURCE_FILE_README "${CMAKE_CURRENT_SOURCE_DIR}/cmake/README.txt")
set(CPACK_RESOURCE_FILE_WELCOME "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Welcome.txt")
set(CPACK_PACKAGE_CONTACT "https://github.com/Immediate-Mode-UI/Nuklear")

include(CPack)
include(CMakePackageConfigHelpers)

# generate the config file that is includes the exports
configure_package_config_file(
        "${CMAKE_CURRENT_SOURCE_DIR}/cmake/Config.cmake.in"
        "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
        INSTALL_DESTINATION "${CMAKE_INSTALL_DATADIR}/nuklear"
        NO_SET_AND_CHECK_MACRO
        NO_CHECK_REQUIRED_COMPONENTS_MACRO
)

# generate the version file for the config file
write_basic_package_version_file(
        "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
        VERSION "${${PROJECT_NAME}_VERSION_MAJOR}.${${PROJECT_NAME}_VERSION_MINOR}"
        COMPATIBILITY AnyNewerVersion
)
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
        DESTINATION "${CMAKE_INSTALL_DATADIR}/nuklear")