enable_language(Pascal)

if(${USESDL12})

    find_package(SDL REQUIRED)

    find_package(SDL_image REQUIRED)

    find_package(SDL_net REQUIRED)

    find_package(SDL_ttf REQUIRED)

    find_package(SDL_mixer REQUIRED)

else(${USESDL12})

    find_package(SDL2 REQUIRED)

    find_package(SDL2_image REQUIRED)

    find_package(SDL2_net REQUIRED)

    find_package(SDL2_ttf REQUIRED)

    find_package(SDL2_mixer REQUIRED)

    add_definitions(-dSDL2)

endif(${USESDL12})

include (CheckLibraryExists)

configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config.inc.in ${CMAKE_CURRENT_BINARY_DIR}/config.inc)

include_directories(${CMAKE_CURRENT_BINARY_DIR})

#set the sources with the correct order of dependencies so that cmake won't be confused

set(engine_sources

    SDLh.pas

    uSinTable.pas

    uFloat.pas

    uConsts.pas

    LuaPas.pas

    uTypes.pas

    uVariables.pas

    uUtils.pas

    uMisc.pas

    uConsole.pas

    uCommands.pas

    uDebug.pas

    uInputHandler.pas

    uTextures.pas

    uRenderUtils.pas

    uRender.pas

    uCaptions.pas

    uIO.pas

    uChat.pas

    uPhysFSLayer.pas

    uSound.pas

    ArgParsers.pas

    uRandom.pas

    uLocale.pas

    uStats.pas

    uCursor.pas

    uVideoRec.pas

    uAILandMarks.pas

    adler32.pas

    uLandTemplates.pas

    uLandTexture.pas

    uLandGraphics.pas

    uLandPainted.pas

    uLandOutline.pas

    uLandGenMaze.pas

    #this is where dependency tracking becomes hard

    uStore.pas

    uAmmos.pas

    uLandObjects.pas

    uLand.pas

    uGearsList.pas

    uCollisions.pas

    uAIMisc.pas

    uAIActions.pas

    uAIAmmoTests.pas

    uAI.pas

    uWorld.pas

    uVisualGearsList.pas

    uVisualGearsHandlers.pas

    uVisualGears.pas

    uGears.pas

    uGame.pas

    uCommandHandlers.pas

    uGearsRender.pas

    uGearsHedgehog.pas

    uGearsHandlers.pas

    uGearsHandlersRope.pas

    uGearsHandlersMess.pas

    uGearsUtils.pas

    uTeams.pas

    #these interact with everything, so compile last

    uScript.pas

    hwengine.pas

    #we also have uTouch.pas

    options.inc

    ${CMAKE_CURRENT_BINARY_DIR}/config.inc

    )

include(${CMAKE_MODULE_PATH}/utils.cmake)

if (${CMAKE_Pascal_COMPILER_VERSION} VERSION_LESS 2.2 OR # older versions are just ancient

    (${CMAKE_Pascal_COMPILER_VERSION} VERSION_LESS 2.6 AND APPLE)) # because of 64bit and opengl bindings

    message(FATAL_ERROR "Your FreePascal installation is too old (fpc ${CMAKE_Pascal_COMPILER_VERSION})!")

elseif(CMAKE_Pascal_COMPILER_VERSION VERSION_GREATER 2.4)

    #enable INLINE only with a recent version of fpc

    add_flag_prepend(CMAKE_Pascal_FLAGS_RELEASE -Si)

endif()

#DEPENDECIES AND EXECUTABLES SECTION

if(NOT ${BUILD_ENGINE_LIBRARY} AND APPLE AND ${USESDL12})

    #on OSX we need to provide the SDL_main() function when building as executable

    add_subdirectory(sdlmain)

    list(APPEND HW_LINK_LIBS SDLmain)

    add_flag_append(CMAKE_Pascal_FLAGS -Fl${LIBRARY_OUTPUT_PATH})

endif()

if(FFMPEG_FOUND)

    add_subdirectory(avwrapper)

    list(APPEND HW_LINK_LIBS avwrapper)

    add_definitions(-dUSE_VIDEO_RECORDING)

    add_flag_append(CMAKE_Pascal_FLAGS -Fl${LIBRARY_OUTPUT_PATH})

    if(${USESDL12})

        #only for SDL < 2, linking carried out by fpc

        find_package_or_disable_msg(GLUT NOVIDEOREC "Video recording will not be built")

    endif(${USESDL12})

endif()

find_package_or_disable_msg(PNG NOPNG "Screenshots will be saved in BMP")

if(PNG_FOUND)

    list(INSERT engine_sources 0 PNGh.pas)

    list(REMOVE_AT PNG_LIBRARIES 1) #removing the zlib library path

    get_filename_component(PNG_LIBRARY_DIR ${PNG_LIBRARIES} PATH)

    add_flag_append(CMAKE_Pascal_FLAGS -Fl${PNG_LIBRARY_DIR})

    add_definitions(-dPNG_SCREENSHOTS)

endif()

if(LUA_FOUND AND LUA_SYSTEM)

    get_filename_component(LUA_LIBRARY_DIR ${LUA_LIBRARY} PATH)

    get_filename_component(LUA_LIBRARY_NAME ${LUA_LIBRARY} NAME)

    #NAME_WE would strip the .1 (or .2) next to the ".so"

    string(REGEX REPLACE "${CMAKE_SHARED_LIBRARY_PREFIX}(.*)${CMAKE_SHARED_LIBRARY_SUFFIX}" "\\1" LUA_LIBRARY_NAME "${LUA_LIBRARY_NAME}")

    add_flag_append(CMAKE_Pascal_FLAGS "-Fl${LUA_LIBRARY_DIR} -XLAlua=${LUA_LIBRARY_NAME}")

else()

    add_definitions(-dLUA_INTERNAL)

    list(APPEND HW_LINK_LIBS lua)

    add_flag_append(CMAKE_Pascal_FLAGS "-XLAlua=${lua_output_name}")

endif()

if(NOT PHYSFS_FOUND)

    add_definitions(-dPHYSFS_INTERNAL)

    list(APPEND HW_LINK_LIBS physfs)

    #-XLA is a beta fpc flag that renames libraries before passing them to the linker

    #we also have to pass PHYSFS_INTERNAL to satisfy windows runtime requirements

    #(should be harmless on other platforms)

    add_flag_append(CMAKE_Pascal_FLAGS "-Fl${LIBRARY_OUTPUT_PATH} -XLAphysfs=${physfs_output_name}")

endif()

list(APPEND HW_LINK_LIBS physlayer)

#Mix_Init/Mix_Quit from SDL_mixer 1.2.10

if(${USESDL12})

    check_library_exists(${SDLMIXER_LIBRARY} Mix_Init "" HAVE_MIXINIT)

    if(HAVE_MIXINIT)

        add_definitions(-dSDL_MIXER_NEWER)

    endif(HAVE_MIXINIT)

    #IMG_Init/IMG_Quit from SDL_image 1.2.8

    check_library_exists(${SDLIMAGE_LIBRARY} IMG_Init "" HAVE_IMGINIT)

    if(HAVE_IMGINIT)

        add_definitions(-dSDL_IMAGE_NEWER)

    endif(HAVE_IMGINIT)

endif(${USESDL12})

#needs to be last

add_definitions(-dDEBUGFILE)

#SOURCE AND PROGRAMS SECTION

if(BUILD_ENGINE_LIBRARY)

    message("***Engine will be built as library (experimental)***")

    if(APPLE AND current_macosx_version VERSION_GREATER "10.5")

        # due to compiler/linker issues on Max OS X 10.6 -k-no_order_inits is needed to avoid linking fail

        add_flag_prepend(CMAKE_Pascal_FLAGS "-k-no_order_inits")

    endif()

    #workaround for missing <TARGET> support during object generation

    set(engine_output_name "${CMAKE_SHARED_LIBRARY_PREFIX}hwengine${CMAKE_SHARED_LIBRARY_SUFFIX}")

    set(destination_dir ${target_library_install_dir})

    add_flag_prepend(CMAKE_Pascal_FLAGS "-o${LIBRARY_OUTPUT_PATH}/${engine_output_name}")

    add_definitions(-dHWLIBRARY)

    add_library(hwengine SHARED ${engine_sources} hwLibrary.pas)

else()

    # no need to change name here because target has same name

    set(engine_output_name "hwengine${CMAKE_EXECUTABLE_SUFFIX}")

    set(destination_dir ${target_binary_install_dir})

    add_executable(hwengine ${engine_sources})

endif()

#even though not actually used, this will trigger relink if any lib changes

target_link_libraries(hwengine ${HW_LINK_LIBS})

install(PROGRAMS "${EXECUTABLE_OUTPUT_PATH}/${engine_output_name}" DESTINATION ${destination_dir})