find_package(SDL)

find_package(SDL_image)

find_package(SDL_net)

find_package(SDL_ttf)

find_package(SDL_mixer)

include (CheckLibraryExists)

#Mix_Init/Mix_Quit from SDL_mixer 1.2.10

check_library_exists(${SDLMIXER_LIBRARY} Mix_Init "" HAVE_MIXINIT)

if(HAVE_MIXINIT)

    list(APPEND pascal_flags "-dSDL_MIXER_NEWER")

endif()

#IMG_Init/IMG_Quit from SDL_image 1.2.8

check_library_exists(${SDLIMAGE_LIBRARY} IMG_Init "" HAVE_IMGINIT)

if(HAVE_IMGINIT)

    list(APPEND pascal_flags "-dSDL_IMAGE_NEWER")

endif()

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

#SOURCE AND PROGRAMS SECTION

if(${BUILD_ENGINE_LIBRARY})

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

    set(hwengine_project hwLibrary.pas)

else()

    set(engine_output_name "hwengine${CMAKE_EXECUTABLE_SUFFIX}")

    set(hwengine_project hwengine.pas)

endif()

if (APPLE)

    set(required_fpc_version 2.6)

else()

    set(required_fpc_version 2.2)

endif()

set(engine_sources

    ${hwengine_project}

    LuaPas.pas

    PNGh.pas

    SDLh.pas

    uAI.pas

    uAIActions.pas

    uAILandMarks.pas

    uAIAmmoTests.pas

    uAIMisc.pas

    uAmmos.pas

    uCaptions.pas

    uChat.pas

    uCollisions.pas

    uCommands.pas

    uCommandHandlers.pas

    uConsole.pas

    uConsts.pas

    uCursor.pas

    uDebug.pas

    uFloat.pas

    uGame.pas

    uGears.pas

    uGearsHandlers.pas

    uGearsHandlersRope.pas

    uGearsHedgehog.pas

    uGearsList.pas

    uGearsRender.pas

    uGearsUtils.pas

    uIO.pas

    uInputHandler.pas

    uLand.pas

    uLandGenMaze.pas

    uLandGraphics.pas

    uLandObjects.pas

    uLandOutline.pas

    uLandPainted.pas

    uLandTemplates.pas

    uLandTexture.pas

    uLocale.pas

    uMisc.pas

    uPhysFSLayer.pas

    uRandom.pas

    uRender.pas

    uRenderUtils.pas

    uScript.pas

    uSinTable.pas

    uSound.pas

    uStats.pas

    uStore.pas

    uTeams.pas

    uTextures.pas

    uTouch.pas

    uTypes.pas

    uUtils.pas

    uVariables.pas

    uVideoRec.pas

    uVisualGears.pas

    uWorld.pas

    GSHandlers.inc

    VGSHandlers.inc

    ArgParsers.inc

    options.inc

    adler32.pas

    ${CMAKE_CURRENT_BINARY_DIR}/config.inc

    )

if(${BUILD_ENGINE_LIBRARY})

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

    list(APPEND pascal_flags "-dHWLIBRARY")

    # create position independent code, only required for x68_64 builds, similar to -fPIC

    if(CMAKE_SIZEOF_VOID_P MATCHES "8")

        list(APPEND pascal_flags "-Cg")

    endif(CMAKE_SIZEOF_VOID_P MATCHES "8")

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

    if(APPLE AND current_macosx_version VERSION_GREATER "10.5")

        list(APPEND pascal_flags "-k-no_order_inits")

    endif()

    set(destination_dir ${target_library_install_dir})

else(${BUILD_ENGINE_LIBRARY})

    set(destination_dir ${target_binary_install_dir})

endif(${BUILD_ENGINE_LIBRARY})

include(${CMAKE_MODULE_PATH}/utils.cmake)

find_package_or_fail(FreePascal)

#when cmake-2.6 support is dropped, this ought to be inside FindFreePascal.cmake

if (FREEPASCAL_VERSION VERSION_LESS required_fpc_version)

    message(FATAL_ERROR "Freepascal ${FREEPASCAL_VERSION} is too old, minimum version required is ${required_fpc_version}")

endif()

#DEPENDECIES AND EXECUTABLES SECTION

if(APPLE)

    string(REGEX MATCH "[pP][pP][cC]+" powerpc_build "${CMAKE_OSX_ARCHITECTURES}")

    string(REGEX MATCH "[iI]386+" i386_build "${CMAKE_OSX_ARCHITECTURES}")

    string(REGEX MATCH "[xX]86_64+" x86_64_build "${CMAKE_OSX_ARCHITECTURES}")

    if(powerpc_build)

        set(powerpc_build "powerpc")

    endif()

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

    if(NOT ${BUILD_ENGINE_LIBRARY})

        #let's look for the installed sdlmain file; if it is not found, let's build our own

        find_package(SDL REQUIRED)

        #remove the ";-framework Cocoa" from the SDL_LIBRARY variable

        string(REGEX REPLACE "(.*);-.*" "\\1" sdl_library_only "${SDL_LIBRARY}")

        #find libsdmain.a

        find_file(SDLMAIN_LIB libSDLMain.a PATHS ${sdl_library_only}/Resources/)

        if(SDLMAIN_LIB MATCHES "SDLMAIN_LIB-NOTFOUND")

            include_directories(${SDL_INCLUDE_DIR})

            add_library (SDLmain STATIC SDLMain.m)

            #add a dependency to the hwengine target

            list(APPEND engine_sources SDLmain)

            set(SDLMAIN_LIB "${LIBRARY_OUTPUT_PATH}/libSDLmain.a")

        endif()

        list(APPEND pascal_flags "-k${SDLMAIN_LIB}")

    endif()

    #when you have multiple ld installation make sure you get the one bundled with the compiler

    get_filename_component(compiler_dir ${CMAKE_C_COMPILER} PATH)

    list(APPEND pascal_flags "-FD${compiler_dir}")

endif(APPLE)

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

if(PNG_FOUND)

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

    get_filename_component(PNG_LIBRARY_DIR ${PNG_LIBRARIES} PATH)

    list(APPEND pascal_flags "-dPNG_SCREENSHOTS" "-Fl${PNG_LIBRARY_DIR}" "-k-L${PNG_LIBRARY_DIR}")

endif()

#this command is a workaround to some inlining issues present in older FreePascal versions and fixed in 2.6

if(FREEPASCAL_VERSION VERSION_LESS "2.6")

    #under some configurations CMAKE_BUILD_TOOL fails to pass on the jobserver, breaking parallel compilation

    if(UNIX)

        set(SAFE_BUILD_TOOL $(MAKE))

    else()

        set(SAFE_BUILD_TOOL ${CMAKE_BUILD_TOOL})

    endif()

    add_custom_target(ENGINECLEAN COMMAND ${SAFE_BUILD_TOOL} "clean" "${PROJECT_BINARY_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}")

endif()

if(${FFMPEG_FOUND})

    list(APPEND pascal_flags "-dUSE_VIDEO_RECORDING")

    # TODO: this check is only for SDL < 2

    # fpc will take care of linking but we need to have this library installed

    find_package(GLUT REQUIRED)

    include_directories(${FFMPEG_INCLUDE_DIR})

    add_library(avwrapper avwrapper.c)

    #TODO: find good VERSION and SOVERSION values

    target_link_libraries(avwrapper ${FFMPEG_LIBRARIES})

    install(TARGETS avwrapper RUNTIME DESTINATION ${target_binary_install_dir}

                              LIBRARY DESTINATION ${target_library_install_dir}

                              ARCHIVE DESTINATION ${target_library_install_dir})

endif()

set(fpc_flags ${pascal_flags} ${hwengine_project})

if(NOT APPLE)

    #here is the command for standard executables or for shared library

    add_custom_command(OUTPUT "${EXECUTABLE_OUTPUT_PATH}/${engine_output_name}"

        COMMAND "${FREEPASCAL_EXECUTABLE}"

        ARGS ${fpc_flags} -o${engine_output_name}

        DEPENDS ${engine_sources}

        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}

        )

else()

    #these are the dependencies for building a universal binary on Mac OS X

    foreach (build_arch ${powerpc_build} ${i386_build} ${x86_64_build})

        list(APPEND lipo_args_list "${EXECUTABLE_OUTPUT_PATH}/hwengine.${build_arch}")

        add_custom_command(OUTPUT "${EXECUTABLE_OUTPUT_PATH}/hwengine.${build_arch}"

            COMMAND "${FREEPASCAL_EXECUTABLE}"

            ARGS ${fpc_flags} -ohwengine.${build_arch} -P${build_arch}

            DEPENDS ${engine_sources}

            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}

            )

        add_custom_target(hwengine.${build_arch} ALL DEPENDS "${EXECUTABLE_OUTPUT_PATH}/hwengine.${build_arch}")

        add_custom_command(TARGET hwengine.${build_arch} POST_BUILD

            COMMAND "install_name_tool"

            ARGS -id @executable_path/../Frameworks/${engine_output_name}

                ${EXECUTABLE_OUTPUT_PATH}/hwengine.${build_arch}

            )

    endforeach()

    add_custom_command(OUTPUT "${EXECUTABLE_OUTPUT_PATH}/${engine_output_name}"

        COMMAND "lipo"

        ARGS ${lipo_args_list} -create -output ${EXECUTABLE_OUTPUT_PATH}/${engine_output_name}

        DEPENDS ${lipo_args_list}

        )

endif()

add_custom_target(hwengine ALL DEPENDS "${EXECUTABLE_OUTPUT_PATH}/${engine_output_name}")

#when system Lua is not found we need to compile it before engine

if(NOT LUA_FOUND)

    add_dependencies(hwengine lua)

endif()

# same for physfs

if(NOT PHYSFS_FOUND)

    add_dependencies(hwengine physfs)

endif()

add_dependencies(hwengine physlayer)

#when ffmpeg/libav is found we need to compile it before engine

#TODO: convert avwrapper to .pas unit so we can skip this step

if(${FFMPEG_FOUND})

    add_dependencies(hwengine avwrapper)

endif()

#this command is a workaround to some inlining issues present in older FreePascal versions and fixed in 2.6

if((FREEPASCAL_VERSION VERSION_LESS "2.6") AND (NOT ${FFMPEG_FOUND}))

    add_dependencies(hwengine ENGINECLEAN)

endif()

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