#only Clang is supported
if(CLANG)
    set(clang_executable ${CLANG})
else()
    find_program(clang_executable
        NAMES clang-mp-3.2 clang-mp-3.1 clang-mp-3.0 clang
        PATHS /opt/local/bin /usr/local/bin /usr/bin)
endif()

if (clang_executable)
    exec_program(${clang_executable} ARGS "-v" OUTPUT_VARIABLE clang_version_full)
    string(REGEX MATCH "[0-9]+\\.[0-9]+" clang_version_long "${clang_version_full}")
    string(REGEX REPLACE "([0-9]+\\.[0-9]+)" "\\1" clang_version "${clang_version_long}")
    #TODO: check version >= 3.0
    message(STATUS "Found CLANG: ${clang_executable} (version ${clang_version})")
else()
    message(FATAL_ERROR "No LLVM/Clang compiler found (required for engine_c target)")
endif()

set(CMAKE_C_COMPILER ${clang_executable})


#the usual set of dependencies
find_package(OpenGL REQUIRED)
find_package(GLEW REQUIRED)
find_package(SDL REQUIRED)
find_package(SDL_mixer REQUIRED)
find_package(SDL_net REQUIRED)
find_package(SDL_image REQUIRED)
find_package(SDL_ttf REQUIRED)

#compile our rtl implementation
include_directories("${GLEW_INCLUDE_PATH}")
include_directories(rtl)
add_subdirectory(rtl)


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

#get the list of pas files that are going to be converted and compiled
file(GLOB engine_sources_pas "${hedgewars_SOURCE_DIR}/hedgewars/*.pas")
#TODO: temporary until cmake can configure itself accordingly
list(REMOVE_ITEM engine_sources_pas "${hedgewars_SOURCE_DIR}/hedgewars/uWeb.pas")
list(REMOVE_ITEM engine_sources_pas "${hedgewars_SOURCE_DIR}/hedgewars/uVideoRec.pas")
list(REMOVE_ITEM engine_sources_pas "${hedgewars_SOURCE_DIR}/hedgewars/uTouch.pas")
list(REMOVE_ITEM engine_sources_pas "${hedgewars_SOURCE_DIR}/hedgewars/PNGh.pas")
list(REMOVE_ITEM engine_sources_pas "${hedgewars_SOURCE_DIR}/hedgewars/pas2cSystem.pas")
list(REMOVE_ITEM engine_sources_pas "${hedgewars_SOURCE_DIR}/hedgewars/pas2cRedo.pas")
list(REMOVE_ITEM engine_sources_pas "${hedgewars_SOURCE_DIR}/hedgewars/hwLibrary.pas")

foreach(sourcefile ${engine_sources_pas})
    get_filename_component(sourcename ${sourcefile} NAME_WE) #drops .pas
    set(engine_sources "${CMAKE_CURRENT_BINARY_DIR}/${sourcename}.c" ${engine_sources})
endforeach()

#invoke pas2c on our pas files
add_custom_command(OUTPUT ${engine_sources}
        COMMAND "${EXECUTABLE_OUTPUT_PATH}/pas2c${CMAKE_EXECUTABLE_SUFFIX}"
        ARGS -n "hwengine"
             -i "${hedgewars_SOURCE_DIR}/hedgewars"
             -o "${CMAKE_CURRENT_BINARY_DIR}"
             -a "${CMAKE_CURRENT_BINARY_DIR}"
        DEPENDS pas2c
    )
add_custom_target(engine_c DEPENDS ${engine_sources})


#compile the c files
add_executable(hwengine WIN32 ${engine_sources})

target_link_libraries(hwengine  fpcrtl
                                ${LUA_LIBRARY}
                                ${OPENGL_LIBRARY}
                                ${SDL_LIBRARY}
                                ${SDLMIXER_LIBRARY}
                                ${SDLNET_LIBRARY}
                                ${SDLIMAGE_LIBRARY}
                                ${SDLTTF_LIBRARY}
                                #TODO: add other libraries
                            )

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