cmake_minimum_required(VERSION 3.3.0 FATAL_ERROR)

if(NOT BASIC_PROJECT_CONFIG_DONE)
    message(FATAL_ERROR "Before including the QtGuiConfig module, the BasicConfig module must be included.")
endif()
if(QT_CONFIGURED)
    message(FATAL_ERROR "The QtGuiConfig module can not be included when Qt usage has already been configured.")
endif()
if(TARGET_CONFIG_DONE)
    message(FATAL_ERROR "Can not include QtGuiConfig module when targets are already configured.")
endif()

# enable Qt Widgets GUI
if(WIDGETS_GUI)
    list(APPEND META_PRIVATE_COMPILE_DEFINITIONS GUI_QTWIDGETS)
    list(APPEND META_PUBLIC_COMPILE_DEFINITIONS ${META_PROJECT_VARNAME_UPPER}_GUI_QTWIDGETS)
    list(APPEND WIDGETS_FILES ${WIDGETS_HEADER_FILES} ${WIDGETS_SRC_FILES} ${WIDGETS_RES_FILES} ${WIDGETS_UI_FILES})
    list(APPEND ADDITIONAL_HEADER_FILES ${WIDGETS_HEADER_FILES})
    if(WIDGETS_FILES)
        list(APPEND ADDITIONAL_QT_MODULES Widgets)
        message(STATUS "Building with Qt Widgets GUI.")
    else()
        message(STATUS "Qt Widgets GUI is not available.")
    endif()
else()
    message(STATUS "Building WITHOUT Qt Widgets GUI.")
endif()

# enable Qt Quick GUI
if(QUICK_GUI)
    list(APPEND META_PRIVATE_COMPILE_DEFINITIONS GUI_QTQUICK)
    list(APPEND META_PUBLIC_COMPILE_DEFINITIONS ${META_PROJECT_VARNAME_UPPER}_GUI_QTQUICK)
    list(APPEND QML_FILES ${QML_HEADER_FILES} ${QML_SRC_FILES} ${QML_RES_FILES})
    list(APPEND ADDITIONAL_HEADER_FILES ${QML_HEADER_FILES})
    if(QML_FILES)
        list(APPEND ADDITIONAL_QT_MODULES Quick)
        list(APPEND ADDITIONAL_QT_REPOS "declarative")
        message(STATUS "Building with Qt Quick GUI.")
    else()
        message(STATUS "Qt Quick GUI is not available.")
    endif()
else()
    message(STATUS "Building WITHOUT Qt Quick GUI.")
endif()

# do further GUI-related configuration only if at least one kind of GUI is enabled (tageditor allows building without GUI
# so this is a valid configuration)
if(WIDGETS_GUI OR QUICK_GUI)
    if(WIN32)
        # set "GUI-type" to WIN32 to hide console under Windows
        set(GUI_TYPE WIN32)
    elseif(APPLE)
        # make the GUI application a "bundle" under MacOSX
        set(GUI_TYPE MACOSX_BUNDLE)
    endif()

    # add source files requried by both GUI variants
    list(APPEND SRC_FILES ${GUI_SRC_FILES})
    list(APPEND ADDITIONAL_HEADER_FILES ${GUI_HEADER_FILES})

    # add option for enabling/disabling static Qt plugins
    option(SVG_SUPPORT "whether to link against the SVG image format plugin (only relevant when using static Qt)" ON)
    option(SVG_ICON_SUPPORT "whether to link against the SVG icon engine (only relevant when using static Qt)" ON)
    set(IMAGE_FORMAT_SUPPORT "Gif;ICO;Jpeg" CACHE STRING "specifies the image format plugins to link against (only relevant when using static Qt)")
endif()