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()

enable_language(Pascal)

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

    LuaPas.pas

    PNGh.pas

    uAILandMarks.pas

    uAmmos.pas

    uCollisions.pas

    uCommandHandlers.pas

    uGearsHandlers.pas

    uGearsHandlersRope.pas

    uGearsHedgehog.pas

    uGearsRender.pas

    uGearsUtils.pas

    uScript.pas

    uVisualGears.pas

    GSHandlers.inc

    VGSHandlers.inc

    ArgParsers.inc

    options.inc

    ${CMAKE_CURRENT_BINARY_DIR}/config.inc

    )

if(${BUILD_ENGINE_LIBRARY})

    message(${WARNING} "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_INCLUDE_DIR 1) #removing the zlib include path

    list(APPEND pascal_flags "-dPNG_SCREENSHOTS -Fl${PNG_INCLUDE_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})

    # 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)

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

    include_directories(${FFMPEG_INCLUDE_DIR})

    list(APPEND pascal_flags "-dUSE_VIDEO_RECORDING")

    if(WIN32)

        # there are some problems with linking our avwrapper as static lib, so link it as shared

        add_library(avwrapper SHARED avwrapper.c)

        target_link_libraries(avwrapper ${FFMPEG_LIBRARIES})

        install(PROGRAMS "${EXECUTABLE_OUTPUT_PATH}/${CMAKE_SHARED_LIBRARY_PREFIX}avwrapper${CMAKE_SHARED_LIBRARY_SUFFIX}" DESTINATION ${target_library_install_dir})

    else()

        add_library(avwrapper STATIC avwrapper.c)

    endif()

endif()

if(APPLE)

    set(CMAKE_Pascal_FLAGS "-Px86_64  -k-llua -k${SDLMAIN_LIB} ${CMAKE_Pascal_FLAGS}")

else()

    set(CMAKE_Pascal_FLAGS "-Pi386 ${CMAKE_Pascal_FLAGS}")

endif()

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

#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

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