# some of these macros are inspired from the boost/cmake macros

# this macro adds external dependencies to a static target,
# compensating for the lack of a link step when building a static library.
# every compiler has its own way of doing it:
# - VC++ supports it directly through the static library flags
# - MinGW/gcc doesn't support it, but as a static library is nothing more than an archive,
#   we can simply merge the external dependencies to our generated target as a post-build step
# - we don't do anything for other compilers and OSes; static build is not encouraged on Unix (Linux, Mac OS X)
#   where shared libraries are properly managed and have many advantages over static libraries
macro(sfml_static_add_libraries target)
    if(WINDOWS AND COMPILER_GCC)
        # Windows - gcc
        foreach(lib ${ARGN})
            if(NOT ${lib} MATCHES ".*/.*")
                string(REGEX REPLACE "(.*)/bin/.*\\.exe" "\\1" STANDARD_LIBS_PATH "${CMAKE_CXX_COMPILER}")
                set(lib "${STANDARD_LIBS_PATH}/lib/lib${lib}.a")
            endif()
            string(TOUPPER ${CMAKE_BUILD_TYPE} BUILD_TYPE)
            get_target_property(TARGET_FILENAME ${target} ${BUILD_TYPE}_LOCATION)
            add_custom_command(TARGET ${target}
                               POST_BUILD
                               COMMAND ${CMAKE_AR} x ${lib}
                               COMMAND ${CMAKE_AR} rcs ${TARGET_FILENAME} *.o
                               COMMAND del *.o /f /q
                               VERBATIM)
        endforeach()
    elseif(MSVC)
        # Visual C++
        set(LIBRARIES "")
        foreach(lib ${ARGN})
            if(NOT ${lib} MATCHES ".*\\.lib")
                set(lib ${lib}.lib)
            endif()
            if(CMAKE_CONFIGURATION_TYPES) # this condition is true when generator is "Visual Studio solution"
                # we add " so that the path will be put inside "", making possible to have spaces in it
                set(LIBRARIES "${LIBRARIES} &quot\\;${lib}&quot\\;")
            else()
                set(LIBRARIES "${LIBRARIES} ${lib}")
            endif()
        endforeach()
        set_target_properties(${target} PROPERTIES STATIC_LIBRARY_FLAGS ${LIBRARIES})
    endif()
endmacro()

# check if a value is contained in a list
# sets ${var} to TRUE if the value is found
macro(sfml_list_contains var value)
    set(${var})
    foreach(value2 ${ARGN})
        if(${value} STREQUAL ${value2})
            set(${var} TRUE)
        endif()
    endforeach()
endmacro()

# parse a list of arguments and options
# ex: sfml_parse_arguments(THIS "SOURCES;DEPENDS" "FLAG" FLAG SOURCES s1 s2 s3 DEPENDS d1 d2)
# will define the following variables:
# - THIS_SOURCES (s1 s2 s3)
# - THIS_DEPENDS (d1 d2)
# - THIS_FLAG TRUE
macro(sfml_parse_arguments prefix arg_names option_names)
    foreach(arg_name ${arg_names})
        set(${prefix}_${arg_name})
    endforeach()
    foreach(option_name ${option_names})
        set(${prefix}_${option_name} FALSE)
    endforeach()
    set(current_arg_name)
    set(current_arg_list)
    foreach(arg ${ARGN})
        sfml_list_contains(is_arg_name ${arg} ${arg_names})
        if(is_arg_name)
            set(${prefix}_${current_arg_name} ${current_arg_list})
            set(current_arg_name ${arg})
            set(current_arg_list)
        else()
            sfml_list_contains(is_option ${arg} ${option_names})
            if(is_option)
                set(${prefix}_${arg} TRUE)
            else()
                set(current_arg_list ${current_arg_list} ${arg})
            endif()
        endif()
    endforeach()
    set(${prefix}_${current_arg_name} ${current_arg_list})
endmacro()

# add a new target which is a SFML library
# ex: sfml_add_library(sfml-graphics
#                      SOURCES sprite.cpp image.cpp ...
#                      DEPENDS sfml-window sfml-system
#                      EXTERNAL_LIBS opengl freetype ...)
macro(sfml_add_library target)

    # parse the arguments
    sfml_parse_arguments(THIS "SOURCES;DEPENDS;EXTERNAL_LIBS" "" ${ARGN})

    # create the target
    add_library(${target} ${THIS_SOURCES})

    # adjust the output file prefix/suffix to match our conventions
    if(BUILD_SHARED_LIBS)
        if(WINDOWS)
            # include the major version number in Windows shared library names (but not import library names)
            set_target_properties(${target} PROPERTIES DEBUG_POSTFIX -d)
            set_target_properties(${target} PROPERTIES SUFFIX "-${VERSION_MAJOR}${CMAKE_SHARED_LIBRARY_SUFFIX}")
        else()
            set_target_properties(${target} PROPERTIES DEBUG_POSTFIX -d)
        endif()
        if (WINDOWS AND COMPILER_GCC)
            # on Windows/gcc get rid of "lib" prefix for shared libraries,
            # and transform the ".dll.a" suffix into ".a" for import libraries
            set_target_properties(${target} PROPERTIES PREFIX "")
            set_target_properties(${target} PROPERTIES IMPORT_SUFFIX ".a")
        endif()
    else()
        set_target_properties(${target} PROPERTIES DEBUG_POSTFIX -s-d)
        set_target_properties(${target} PROPERTIES RELEASE_POSTFIX -s)
    endif()

    # set the version and soversion of the target (for compatible systems -- mostly Linuxes)
    set_target_properties(${target} PROPERTIES SOVERSION ${VERSION_MAJOR}.${VERSION_MINOR})
    set_target_properties(${target} PROPERTIES VERSION ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH})

    # for gcc 4.x on Windows, we add the -static-libgcc linker flag to get rid of an extra gcc DLL
    if(WINDOWS AND COMPILER_GCC)
        if(${GCC_VERSION} MATCHES "4\\..*")
            set_target_properties(${target} PROPERTIES LINK_FLAGS -static-libgcc)
        endif()
    endif()

    # link the target to its SFML dependencies
    if(THIS_DEPENDS)
        target_link_libraries(${target} ${THIS_DEPENDS})
    endif()

    # link the target to its external dependencies
    if(THIS_EXTERNAL_LIBS)
        if(BUILD_SHARED_LIBS)
            # in shared build, we use the regular linker commands
            target_link_libraries(${target} ${THIS_EXTERNAL_LIBS})
        else()
            # in static build there's no link stage, but with some compilers it is possible to force
            # the generated static library to directly contain the symbols from its dependencies
            sfml_static_add_libraries(${target} ${THIS_EXTERNAL_LIBS})
        endif()
    endif()

    # add the install rule
    install(TARGETS ${target}
            RUNTIME DESTINATION bin COMPONENT bin
            LIBRARY DESTINATION lib COMPONENT bin 
            ARCHIVE DESTINATION lib COMPONENT devel)

endmacro()

# add a new target which is a SFML example
# ex: sfml_add_example(ftp
#                      SOURCES ftp.cpp ...
#                      DEPENDS sfml-network sfml-system)
macro(sfml_add_example target)

    # parse the arguments
    sfml_parse_arguments(THIS "SOURCES;DEPENDS" "GUI_APP" ${ARGN})

    # create the target
    if(THIS_GUI_APP AND WINDOWS)
        add_executable(${target} WIN32 ${THIS_SOURCES})
        target_link_libraries(${target} sfml-main)
    else()
        add_executable(${target} ${THIS_SOURCES})
    endif()

    # set the debug suffix
    set_target_properties(${target} PROPERTIES DEBUG_POSTFIX -d)

    # for gcc 4.x on Windows, we add the -static-libgcc linker flag to get rid of an extra gcc DLL
    if(WINDOWS AND COMPILER_GCC)
        if(${GCC_VERSION} MATCHES "4\\..*")
            set_target_properties(${target} PROPERTIES LINK_FLAGS -static-libgcc)
        endif()
    endif()

    # link the target to its SFML dependencies
    if(THIS_DEPENDS)
        target_link_libraries(${target} ${THIS_DEPENDS})
    endif()

    # add the install rule
    install(TARGETS ${target}
            RUNTIME DESTINATION ${INSTALL_MISC_DIR}/examples/${target} COMPONENT examples)

    # install the example's resources as well
    set(EXAMPLE_RESOURCES "${CMAKE_SOURCE_DIR}/examples/${target}/resources")
    if(EXISTS ${EXAMPLE_RESOURCES})
        install(DIRECTORY ${EXAMPLE_RESOURCES}
                DESTINATION ${INSTALL_MISC_DIR}/examples/${target}
                COMPONENT examples
                PATTERN ".svn" EXCLUDE)
    endif()
endmacro()