find_package(SDL)
find_package(SDL_image)
find_package(SDL_net)
find_package(SDL_ttf)
find_package(SDL_mixer)
find_package(Lua)

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

#find which version of SDL_image and SDL_mixer we have (for IMG_Init and Mix_Init)
#if the headers are not installed, the newer apis won't be activated
find_file(sdlmixer_h SDL_mixer.h ${SDLMIXER_INCLUDE_DIR})
if(sdlmixer_h)
    file(STRINGS ${sdlmixer_h} sdlmixer_version_tmp REGEX "SDL_MIXER_PATCHLEVEL[\t' ']+[0-9]+")
    string(REGEX MATCH ".([0-9]+)" sdlmixer_version "${sdlmixer_version_tmp}")

    if(sdlmixer_version GREATER 9)
        message(STATUS "Enabling enhanced SDL_Mixer calls")
        set(pascal_compiler_flags_cmn "-dSDL_MIXER_NEWER" ${pascal_compiler_flags_cmn})
    endif()
endif()

find_file(sdlimage_h SDL_image.h ${SDLIMAGE_INCLUDE_DIR})
if(sdlimage_h)
    file(STRINGS ${sdlimage_h} sdlimage_version_tmp REGEX "SDL_IMAGE_PATCHLEVEL[\t' ']+[0-9]+")
    string(REGEX MATCH ".([0-9]+)" sdlimage_version "${sdlimage_version_tmp}")

    if(sdlimage_version GREATER 7)
        message(STATUS "Enabling enhanced SDL_Image calls")
        set(pascal_compiler_flags_cmn "-dSDL_IMAGE_NEWER" ${pascal_compiler_flags_cmn})
    endif()
endif()

#SOURCE AND PROGRAMS SECTION
set(fpc_tryexe fpc)
set(hwengine_project ${hedgewars_SOURCE_DIR}/hedgewars/hwengine.pas)

set(engine_sources
    ${hwengine_project}
    SDLh.pas
    uAI.pas
    uAIActions.pas
    uAIAmmoTests.pas
    uAIMisc.pas
    uAmmos.pas
    uChat.pas
    uCollisions.pas
    uCommands.pas
    uConsole.pas
    uConsts.pas
    uFloat.pas
    uGame.pas
    uGears.pas
    uIO.pas
    uKeys.pas
    uLand.pas
    uLandGraphics.pas
    uLandObjects.pas
    uLandTemplates.pas
    uLandTexture.pas
    uLocale.pas
    uMisc.pas
    uMobile.pas
    uRandom.pas
    uScript.pas
    adler32.pas
    uSound.pas
    uStats.pas
    uStore.pas
    uTeams.pas
    uTypes.pas
    uVisualGears.pas
    uWorld.pas
    CCHandlers.inc
    GSHandlers.inc
    VGSHandlers.inc
    GearDrawing.inc
    HHHandlers.inc
    SinTable.inc
    ArgParsers.inc
    options.inc
    ${CMAKE_CURRENT_BINARY_DIR}/config.inc
    )

if(BUILD_ENGINE_LIBRARY)
    message(STATUS "Engine will be built as library (experimental)")
    set(hwengine_project ${hedgewars_SOURCE_DIR}/hedgewars/hwLibrary.pas)
    set(engine_sources ${hwengine_project} PascalExports.pas ${engine_sources})
    set(pascal_compiler_flags_cmn "-dHWLIBRARY" "-k-no_order_inits" "-fPIC" ${pascal_compiler_flags_cmn})
endif(BUILD_ENGINE_LIBRARY)


find_program(fpc_executable ${fpc_tryexe})

if(fpc_executable)
    exec_program(${fpc_executable} ARGS "-iV" OUTPUT_VARIABLE fpc_output)
endif(fpc_executable)

set(noexecstack_flags "-k-z" "-knoexecstack")
file(WRITE ${EXECUTABLE_OUTPUT_PATH}/checkstack.pas "begin end.")

exec_program(${fpc_executable} ${EXECUTABLE_OUTPUT_PATH}
    ARGS ${noexecstack_flags} checkstack.pas
    OUTPUT_VARIABLE noout
    RETURN_VALUE testnoexecstack
    )

if(${testnoexecstack})
    set (noexecstack_flags "")
endif(${testnoexecstack})


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()
endif(APPLE)


#PASCAL DETECTION SECTION
string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" fpc_version "${fpc_output}")

if(fpc_version)
    string(REGEX REPLACE "([0-9]+)\\.[0-9]+\\.[0-9]+" "\\1" fpc_vers_major "${fpc_version}")
    string(REGEX REPLACE "[0-9]+\\.([0-9]+)\\.[0-9]+" "\\1" fpc_vers_minor "${fpc_version}")
    string(REGEX REPLACE "[0-9]+\\.[0-9]+\\.([0-9]+)" "\\1" fpc_vers_patch "${fpc_version}")
    message(STATUS "Freepascal version detected: ${fpc_vers_major}.${fpc_vers_minor}")
    math(EXPR fpc_ver "${fpc_vers_major}*10000 + ${fpc_vers_minor}*100 + ${fpc_vers_patch}")

    if(fpc_ver LESS "020200")
        message(FATAL_ERROR "Minimum required version of FreePascal is 2.2.0")
    elseif(APPLE AND x86_64_build AND fpc_ver LESS "020400")
        message(FATAL_ERROR "Minimum required version of FreePascal is 2.4.0 for building 64 bit applications!")
    endif()
else()
    message(FATAL_ERROR "No Pascal compiler found!")
endif()

set(pascal_compiler ${fpc_executable})
set(pascal_compiler_flags ${noexecstack_flags} ${pascal_compiler_flags_cmn} ${hwengine_project})


#DEPENDECIES AND EXECUTABLES SECTION
IF(NOT APPLE OR BUILD_ENGINE_LIBRARY)
    #here is the command for standard executables or for shared library
    add_custom_command(OUTPUT "${EXECUTABLE_OUTPUT_PATH}/hwengine${CMAKE_EXECUTABLE_SUFFIX}"
        COMMAND "${pascal_compiler}"
        ARGS ${pascal_compiler_flags}
        MAIN_DEPENDENCY ${hwengine_project}
        DEPENDS ${engine_sources}
        )
ELSE()
    #let's build sdlmain, which is absent from the framework
    find_package(SDL REQUIRED)

    set(LIBRARY_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)
    include_directories(${SDL_INCLUDE_DIR})

    add_library (SDLmain STATIC SDLMain.m)


    #these are the dependencies for building a universal binary on Mac OS X
    foreach (build_arch ${powerpc_build} ${i386_build} ${x86_64_build})
        set(lipo_args_list "${EXECUTABLE_OUTPUT_PATH}/hwengine.${build_arch}" ${lipo_args_list})
        add_custom_command(OUTPUT "${EXECUTABLE_OUTPUT_PATH}/hwengine.${build_arch}"
            COMMAND "${pascal_compiler}"
            ARGS ${pascal_compiler_flags} -ohwengine.${build_arch} -P${build_arch}
            MAIN_DEPENDENCY ${hwengine_project}
            DEPENDS ${engine_sources} SDLmain lua
            )
        add_custom_target(hwengine.${build_arch} ALL DEPENDS "${EXECUTABLE_OUTPUT_PATH}/hwengine.${build_arch}")
    endforeach()

    add_custom_command(OUTPUT "${EXECUTABLE_OUTPUT_PATH}/hwengine"
        COMMAND "lipo"
        ARGS ${lipo_args_list} -create -output ${EXECUTABLE_OUTPUT_PATH}/hwengine
        DEPENDS ${lipo_args_list}
        )
ENDIF()


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

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