cmake_minimum_required(VERSION 3.16)

# CMake will not change any file in the source folder.
set(CMAKE_DISABLE_SOURCE_CHANGES ON)

# The build process should be kept in a different folder from the main source code.
set(CMAKE_DISABLE_IN_SOURCE_BUILD ON)


project(CatacombGL LANGUAGES CXX C VERSION 0.5.7)

# GoogleTests are by default not part of the build process, but can be added
# by selecting the option in CMake.
option(BUILD_TESTS "Build Tests" OFF)

# Sets the C++ Language Standard to "ISO C++17 Standard" in Visual Studio.
set(CMAKE_CXX_STANDARD 17)

if(MINGW)
    # This might not only be required for mingw
    set(CMAKE_EXE_LINKER_FLAGS "-static -static-libstdc++")
endif()

find_package(OpenGL)

add_subdirectory(ThirdParty)
add_subdirectory(src/Engine)
add_subdirectory(src/Abyss)
add_subdirectory(src/Apocalypse)
add_subdirectory(src/Armageddon)
add_subdirectory(src/Catacomb3D)

if(WIN32)
    # On Windows, the SDL2 development package is fetched from Github.
    include(FetchContent)

    if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.24.0")
		cmake_policy(SET CMP0135 NEW)
	endif()

    FetchContent_Declare(
        sdldev
        URL     https://github.com/libsdl-org/SDL/releases/download/release-2.30.6/SDL2-devel-2.30.6-VC.zip
        URL_MD5 54e68b9c4627627107105fa108bf7eed
    )

    FetchContent_MakeAvailable(sdldev)
    set(SDL2_PATH ${sdldev_SOURCE_DIR})
    find_package(SDL2 REQUIRED CONFIG PATHS ${sdldev_SOURCE_DIR}/cmake NO_DEFAULT_PATH)

    target_link_libraries( CatacombGL_Engine
        "shlwapi"
        SDL2::SDL2main
    )
    target_link_libraries( CatacombGL_ThirdParty
        "shlwapi"
        SDL2::SDL2main
    )

else()
    # On Linux, it is assumed that the SDL2 development package is already installed.
    find_package(SDL2 REQUIRED)

endif()

add_executable(CatacombGL)

function(link_each_target_to_libs libs targets)
    foreach(target ${targets})
        target_link_libraries( ${target}
            ${libs}
        )
    endforeach()
endfunction()

function(add_include_dirs_for_each_target dirs targets)
    foreach(target ${targets})
        target_include_directories( ${target}
            PRIVATE
            ${dirs}
        )
    endforeach()
endfunction()

set( CATACOMBGL_TARGETS
    "CatacombGL_Engine"
    "CatacombGL_Abyss"
    "CatacombGL_Armageddon"
    "CatacombGL_Apocalypse"
    "CatacombGL_Catacomb3D"
    "CatacombGL_ThirdParty"
)

if(SDL2_VERSION VERSION_GREATER_EQUAL "2.0.12")
    link_each_target_to_libs( SDL2::SDL2
        "${CATACOMBGL_TARGETS}"
    )

else()
    link_each_target_to_libs( ${SDL2_LIBRARIES}
        "${CATACOMBGL_TARGETS}"
    )
    add_include_dirs_for_each_target( ${SDL2_INCLUDE_DIRS}
        "CatacombGL;${CATACOMBGL_TARGETS}"
    )

endif()

add_subdirectory(src/System)

if(WIN32)
    target_sources( CatacombGL
    PUBLIC
        ${CMAKE_SOURCE_DIR}/res/win/CatacombGL.ico
        ${CMAKE_SOURCE_DIR}/res/win/CatacombGL.rc
        ${CMAKE_SOURCE_DIR}/res/win/resource.h
    )

    set_source_files_properties(
        ${CMAKE_SOURCE_DIR}/res/win/CatacombGL.rc
        PROPERTIES LANGUAGE RC
    )

endif()

target_link_libraries( CatacombGL
    CatacombGL_ThirdParty
    CatacombGL_Engine
    CatacombGL_Abyss
    CatacombGL_Armageddon
    CatacombGL_Apocalypse
    CatacombGL_Catacomb3D
    OpenGL::GL
)

if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME AND BUILD_TESTS)
    add_subdirectory(src/Test)
endif()

include(CPack)
if(WIN32)
    set(CMAKE_INSTALL_BINDIR ".")
    set(CMAKE_INSTALL_LIBDIR ".")
    install(FILES $<TARGET_RUNTIME_DLLS:CatacombGL> TYPE LIB)
endif()
install(TARGETS CatacombGL RUNTIME)