cmake_minimum_required(VERSION 3.3.0 FATAL_ERROR)

# applies Qt specific configuration
# for GUI applications, QtGuiAppConfig must be included before
# this module must be included before AppTarget/LibraryTarget

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

# add the Core module as it is always required
# also add additional Qt/KF modules which must have been specified before if required
# the Gui/Widgets/Quick modules should be added by including QtGuiAppConfig
set(QT_REPOS base ${ADDITIONAL_QT_REPOS})
set(QT_MODULES ${ADDITIONAL_QT_MODULES} Core)
set(KF_MODULES ${ADDITIONAL_KF_MODULES})

# allow specifying a custom directory for Qt plugins
set(QT_PLUGIN_DIR "" CACHE STRING "specifies the directory to install Qt plugins")

include(QtLinkage)

# check whether D-Bus interfaces need to be processed
if(DBUS_FILES)
    message(STATUS "Project has D-Bus interface declarations which will be processed.")
    # the D-Bus Qt module is required
    list(APPEND QT_MODULES DBus)
endif()

# remove duplicates
list(REMOVE_DUPLICATES QT_REPOS)
list(REMOVE_DUPLICATES QT_MODULES)
if(IMPORTED_QT_MODULES)
    list(REMOVE_DUPLICATES IMPORTED_QT_MODULES)
endif()
if(KF_MODULES)
    list(REMOVE_DUPLICATES KF_MODULES)
endif()
if(IMPORTED_KF_MODULES)
    list(REMOVE_DUPLICATES IMPORTED_KF_MODULES)
endif()

# actually find the required Qt/KF modules
foreach(QT_MODULE ${QT_MODULES})
    # using those helpers allows using static Qt 5 build
    find_qt5_module(${QT_MODULE} REQUIRED)
    use_qt5_module(${QT_MODULE} REQUIRED)
endforeach()
foreach(QT_MODULE ${IMPORTED_QT_MODULES})
    if(NOT "${QT_MODULE}" IN_LIST QT_MODULES)
        find_qt5_module(${QT_MODULE} REQUIRED)
    endif()
endforeach()
foreach(KF_MODULE ${KF_MODULES})
    # only shared KF5 modules supported
    find_package(KF5${KF_MODULE} REQUIRED)
    set(KF5_${KF_MODULE}_DYNAMIC_LIB KF5::${KF_MODULE})
    link_against_library(KF5_${KF_MODULE} "AUTO_LINKAGE" REQUIRED)
endforeach()
foreach(KF_MODULE ${IMPORTED_KF_MODULES})
    if(NOT "${KF_MODULE}" IN_LIST KF_MODULES)
        find_package(KF5${KF_MODULE} REQUIRED)
    endif()
endforeach()

# built-in platform, imageformat and iconengine plugins when linking statically against Qt Gui
# -> determine whether application target links statically against Qt Gui
if(META_PROJECT_TYPE STREQUAL "application")
    set(USING_STATIC_QT_GUI_FOR_APPLICATION NO)
    foreach(MODULE Gui Widgets Quick)
        if(QT5_${MODULE}_STATIC_LIB IN_LIST LIBRARIES OR QT5_${MODULE}_STATIC_LIB IN_LIST PRIVATE_LIBRARIES)
            set(USING_STATIC_QT_GUI_FOR_APPLICATION YES)
            message(STATUS "Linking application ${META_PROJECT_NAME} against static Qt 5 plugins.")
            break()
        endif()
    endforeach()
endif()
# -> link against plugins according to platform and configuration
if(USING_STATIC_QT_GUI_FOR_APPLICATION)
    if(NOT USE_STATIC_QT5_Gui)
        find_qt5_module(Gui REQUIRED)
    endif()

    # ensure platform integration plugins for corresponding platforms are built-in when creating a GUI application
    if(WIN32)
        use_static_qt5_plugin(Gui WindowsIntegration ON OFF)
    elseif(APPLE)
        use_static_qt5_plugin(Gui CocoaIntegration ON OFF)
    elseif(TARGET ${QT5_Gui_STATIC_PREFIX}QXcbIntegrationPlugin)
        use_static_qt5_plugin(Gui XcbIntegration ON OFF)
    else()
        message(WARNING "The required platform plugin for your platform is unknown an can not be linked in statically.")
    endif()

    # ensure all available widget style plugins are built-in when creating a Qt Widgets application
    # note: required since Qt 5.10 because the styles have been "pluginized" (see commit 4f3249f)
    set(KNOWN_WIDGET_STYLE_PLUGINS WindowsVistaStyle MacStyle AndroidStyle)
    set(USED_WIDGET_STYLE_PLUGINS)
    if(QT5_Widgets_STATIC_LIB IN_LIST LIBRARIES OR QT5_Widgets_STATIC_LIB IN_LIST PRIVATE_LIBRARIES)
        foreach(WIDGET_STYLE_PLUGIN ${KNOWN_WIDGET_STYLE_PLUGINS})
            if(TARGET "${QT5_Widgets_STATIC_PREFIX}Q${WIDGET_STYLE_PLUGIN}Plugin")
                use_static_qt5_plugin(Widgets "${WIDGET_STYLE_PLUGIN}" ON OFF)
                list(APPEND USED_WIDGET_STYLE_PLUGINS "${WIDGET_STYLE_PLUGIN}")
            endif()
        endforeach()

        # allow importing image format plugins via config.h
        include(ListToString)
        list_to_string(" " "\\\n    Q_IMPORT_PLUGIN(Q" "Plugin)" "${USED_WIDGET_STYLE_PLUGINS}" WIDGET_STYLE_PLUGINS_ARRAY)
    endif()

    # ensure image format plugins (beside SVG) are built-in if configured
    if(IMAGE_FORMAT_SUPPORT)
        foreach(IMAGE_FORMAT ${IMAGE_FORMAT_SUPPORT})
            if(IMAGE_FORMAT EQUAL "Svg")
                # the image format plugin of the Qt Svg module is handled separately
                set(SVG_SUPPORT ON)
                list(REMOVE_ITEM IMAGE_FORMAT_SUPPORT Svg)
            else()
                use_static_qt5_plugin(Gui "${IMAGE_FORMAT}" ON OFF)
            endif()
        endforeach()

        # allow importing image format plugins via config.h
        include(ListToString)
        list_to_string(" " "\\\n    Q_IMPORT_PLUGIN(Q" "Plugin)" "${IMAGE_FORMAT_SUPPORT}" IMAGE_FORMAT_SUPPORT_ARRAY)
    endif()

    # ensure SVG plugins are built-in if configured
    if((SVG_SUPPORT OR SVG_ICON_SUPPORT) AND NOT USE_STATIC_QT5_Svg)
        find_qt5_module(Svg REQUIRED)
    endif()
    if(SVG_SUPPORT)
        use_static_qt5_plugin(Svg Svg ON OFF)
    endif()
    if(SVG_ICON_SUPPORT)
        use_static_qt5_plugin(Svg SvgIcon ON OFF)
    endif()
endif()

# option for built-in translations
option(BUILTIN_TRANSLATIONS "enables/disables built-in translations when building applications and libraries" OFF)

# determine relevant Qt translation files
set(QT_TRANSLATION_FILES)
set(QT_TRANSLATION_SEARCH_PATHS)
if(CMAKE_FIND_ROOT_PATH)
    list(APPEND QT_TRANSLATION_SEARCH_PATHS "${CMAKE_FIND_ROOT_PATH}/share/qt/translations")
endif()
list(APPEND QT_TRANSLATION_SEARCH_PATHS "${CMAKE_INSTALL_PREFIX}/share/qt/translations")
list(APPEND QT_TRANSLATION_SEARCH_PATHS "/usr/share/qt/translations")
foreach(QT_TRANSLATION_PATH ${QT_TRANSLATION_SEARCH_PATHS})
    if(IS_DIRECTORY "${QT_TRANSLATION_PATH}")
        foreach(QT_REPO ${QT_REPOS})
            file(GLOB QT_QM_FILES "${QT_TRANSLATION_PATH}/qt${QT_REPO}_*.qm")
            if(QT_QM_FILES)
                # add files to list of built-in translations
                # but only if that configuration is enabled and if we're building the final application
                if(BUILTIN_TRANSLATIONS AND "${META_PROJECT_TYPE}" STREQUAL "application")
                    file(COPY ${QT_QM_FILES} DESTINATION "${CMAKE_CURRENT_BINARY_DIR}")
                    list(APPEND EXTERNAL_QM_FILES ${QT_QM_FILES})
                endif()
                list(APPEND QT_TRANSLATION_FILES "qt${QT_REPO}")
            endif()
        endforeach()
        break()
    endif()
endforeach()

# make relevant Qt translations available as array via config.h
include(ListToString)
list_to_string("," " \\\n    QStringLiteral(\"" "\")" "${QT_TRANSLATION_FILES}" QT_TRANSLATION_FILES_ARRAY)

# enable lrelease and add install target for localization
option(ENABLE_QT_TRANSLATIONS "specifies whether Qt translations should be updated/released" ON)
if(ENABLE_QT_TRANSLATIONS AND TS_FILES)
    message(STATUS "Project has translations which will be released.")
    set(APP_SPECIFIC_QT_TRANSLATIONS_AVAILABLE YES)

    # the LinguistTools module is required
    # (but not add it to QT_MODULES because we don't link against it)
    find_package(Qt5LinguistTools REQUIRED)

    set(LUPDATE_OPTIONS "" CACHE STRING "specifies options passed to lupdate")

    # adds the translations and a target for it
    qt5_create_translation(QM_FILES
        ${HEADER_FILES} ${SRC_FILES}
        ${WIDGETS_HEADER_FILES} ${WIDGETS_SRC_FILES} ${WIDGETS_UI_FILES}
        ${QML_HEADER_FILES} ${QML_SRC_FILES} ${QML_RES_FILES}
        ${TS_FILES}
        OPTIONS ${LUPDATE_OPTIONS}
    )
    add_custom_target(${META_PROJECT_NAME}_translations DEPENDS ${QM_FILES})
    if(NOT TARGET translations)
        add_custom_target(translations DEPENDS ${META_PROJECT_NAME}_translations)
    else()
        add_dependencies(translations ${META_PROJECT_NAME}_translations)
    endif()

    # add install target for translations
    if(NOT META_NO_INSTALL_TARGETS AND ENABLE_INSTALL_TARGETS)
        install(FILES ${QM_FILES}
            DESTINATION share/${META_PROJECT_NAME}/translations
            COMPONENT localization
        )
        if(NOT TARGET install-localization)
            set(LOCALIZATION_TARGET "install-localization")
            add_custom_target(${LOCALIZATION_TARGET}
                COMMAND "${CMAKE_COMMAND}" -DCMAKE_INSTALL_COMPONENT=localization -P "${CMAKE_BINARY_DIR}/cmake_install.cmake"
            )
            add_dependencies(${LOCALIZATION_TARGET} ${META_PROJECT_NAME}_translations)
        endif()
    endif()

    list(APPEND APP_SPECIFIC_QT_TRANSLATION_FILES "${META_PROJECT_NAME}")
endif()

# make application specific translation available as array via config.h
# (even if this project has no translations, there might be some from dependencies)
if(APP_SPECIFIC_QT_TRANSLATION_FILES)
    list_to_string("," " \\\n    QStringLiteral(\"" "\")" "${APP_SPECIFIC_QT_TRANSLATION_FILES}" APP_SPECIFIC_QT_TRANSLATION_FILES_ARRAY)
else()
    set(APP_SPECIFIC_QT_TRANSLATIONS_AVAILABLE NO)
endif()

# built-in translations
if(BUILTIN_TRANSLATIONS AND (QM_FILES OR EXTERNAL_QM_FILES))
    # write a qrc file for the qm files and add it to the resource files
    set(TRANSLATIONS_QRC_FILE_NAME "${META_PROJECT_VARNAME_LOWER}_translations.qrc")
    set(TRANSLATIONS_QRC_FILE "${CMAKE_CURRENT_BINARY_DIR}/${TRANSLATIONS_QRC_FILE_NAME}")
    file(WRITE "${TRANSLATIONS_QRC_FILE}" "<RCC><qresource prefix=\"/translations\">")
    foreach(QM_FILE ${QM_FILES} ${EXTERNAL_QM_FILES})
        get_filename_component(QM_FILE_NAME "${QM_FILE}" NAME)
        file(APPEND "${TRANSLATIONS_QRC_FILE}" "<file>${QM_FILE_NAME}</file>")
    endforeach()
    file(APPEND "${TRANSLATIONS_QRC_FILE}" "</qresource></RCC>")
    list(APPEND RES_FILES "${TRANSLATIONS_QRC_FILE}")
    list(APPEND AUTOGEN_DEPS ${QM_FILES} ${EXTERNAL_QM_FILES})
    list(APPEND BUILTIN_TRANSLATION_FILES "${TRANSLATIONS_QRC_FILE_NAME}")
endif()

# generate DBus interfaces
if(DBUS_FILES)
    qt5_add_dbus_interfaces(GENERATED_DBUS_FILES ${DBUS_FILES})
endif()

# add icons to be built-in
if(REQUIRED_ICONS)
    set(BUILTIN_ICON_THEMES "" CACHE STRING "specifies icon themes to be built-in")
    option(BUILTIN_ICON_THEMES_IN_LIBRARIES "specifies whether icon themes should also be built-in when building libraries" OFF)
    if(BUILTIN_ICON_THEMES AND (BUILTIN_ICON_THEMES_IN_LIBRARIES OR (NOT "${META_PROJECT_TYPE}" STREQUAL "library")))
        set(ICON_THEME_FILES)
        set(ICON_SEARCH_PATHS)
        if(CMAKE_FIND_ROOT_PATH)
            # find icons from the regular prefix when cross-compiling
            list(APPEND ICON_SEARCH_PATHS "${CMAKE_FIND_ROOT_PATH}/share/icons")
        endif()
        list(APPEND ICON_SEARCH_PATHS "${CMAKE_INSTALL_PREFIX}/share/icons")
        list(APPEND ICON_SEARCH_PATHS "/usr/share/icons")
        set(BUILTIN_ICONS_DIR "${CMAKE_CURRENT_BINARY_DIR}/icons")
        set(DEFAULT_THEME_INDEX_FILE "${BUILTIN_ICONS_DIR}/default/index.theme")
        file(REMOVE_RECURSE "${BUILTIN_ICONS_DIR}")
        file(MAKE_DIRECTORY "${BUILTIN_ICONS_DIR}")
        foreach(ICON_THEME ${BUILTIN_ICON_THEMES})
            string(REGEX MATCHALL "([^:]+|[^:]+$)" ICON_THEME_PARTS "${ICON_THEME}")
            list(LENGTH ICON_THEME_PARTS ICON_THEME_PARTS_LENGTH)
            if("${ICON_THEME_PARTS_LENGTH}" STREQUAL 2)
                list(GET ICON_THEME_PARTS 0 ICON_THEME)
                list(GET ICON_THEME_PARTS 1 NEW_ICON_THEME_NAME)
            else()
                set(NEW_ICON_THEME_NAME "${ICON_THEME}")
            endif()
            foreach(ICON_SEARCH_PATH ${ICON_SEARCH_PATHS})
                set(ICON_THEME_PATH "${ICON_SEARCH_PATH}/${ICON_THEME}")
                set(NEW_ICON_THEME_PATH "${ICON_SEARCH_PATH}/${ICON_THEME}")
                if(IS_DIRECTORY "${ICON_THEME_PATH}")
                    message(STATUS "The specified icon theme \"${ICON_THEME}\" has been located under \"${ICON_THEME_PATH}\" and will be built-in.")
                    # find index files
                    if(NOT ICON_THEME STREQUAL FALLBACK_ICON_THEME)
                        file(GLOB GLOBBED_ICON_THEME_INDEX_FILES LIST_DIRECTORIES false "${ICON_THEME_PATH}/index.theme" "${ICON_THEME_PATH}/icon-theme.cache")
                    else()
                        # only index.theme required when icons are provided as fallback anyways
                        file(GLOB GLOBBED_ICON_THEME_INDEX_FILES LIST_DIRECTORIES false "${ICON_THEME_PATH}/index.theme")
                    endif()
                    # make the first specified built-in the default theme
                    if(NOT EXISTS "${DEFAULT_THEME_INDEX_FILE}")
                        file(MAKE_DIRECTORY "${BUILTIN_ICONS_DIR}/default")
                        file(WRITE "${DEFAULT_THEME_INDEX_FILE}" "[Icon Theme]\nInherits=${NEW_ICON_THEME_NAME}")
                        list(APPEND ICON_THEME_FILES "<file>default/index.theme</file>")
                    endif()
                    # find required icons, except the icon theme is provided as fallback anyways
                    if(NOT ICON_THEME STREQUAL FALLBACK_ICON_THEME)
                        set(GLOB_PATTERNS)
                        foreach(REQUIRED_ICON ${REQUIRED_ICONS})
                            list(APPEND GLOB_PATTERNS
                                "${ICON_THEME_PATH}/${REQUIRED_ICON}"
                                "${ICON_THEME_PATH}/${REQUIRED_ICON}.*"
                                "${ICON_THEME_PATH}/*/${REQUIRED_ICON}"
                                "${ICON_THEME_PATH}/*/${REQUIRED_ICON}.*"
                            )
                        endforeach()
                        file(GLOB_RECURSE GLOBBED_ICON_THEME_FILES LIST_DIRECTORIES false ${GLOB_PATTERNS})
                    else()
                        message(STATUS "Icon files for specified theme \"${ICON_THEME}\" are skipped because these are provided as fallback anyways.")
                        set(GLOBBED_ICON_THEME_FILES)
                    endif()
                    # make temporary copy of required icons and create resource list for Qt
                    foreach(ICON_THEME_FILE ${GLOBBED_ICON_THEME_INDEX_FILES} ${GLOBBED_ICON_THEME_FILES})
                        # resolve symlinks
                        if(IS_SYMLINK "${ICON_THEME_FILE}")
                            string(REGEX REPLACE "^${ICON_SEARCH_PATH}/" "" ICON_THEME_FILE_RELATIVE_PATH "${ICON_THEME_FILE}")
                            string(REGEX REPLACE "(^[^/\\]+)" "${NEW_ICON_THEME_NAME}" NEW_ICON_THEME_FILE_RELATIVE_PATH "${ICON_THEME_FILE_RELATIVE_PATH}")
                            set(ICON_THEME_FILE_ALIAS " alias=\"${NEW_ICON_THEME_FILE_RELATIVE_PATH}\"")
                            get_filename_component(ICON_THEME_FILE "${ICON_THEME_FILE}" REALPATH)
                        else()
                            unset(ICON_THEME_FILE_ALIAS)
                        endif()
                        string(REGEX REPLACE "^${ICON_SEARCH_PATH}/" "" ICON_THEME_FILE_RELATIVE_PATH "${ICON_THEME_FILE}")
                        string(REGEX REPLACE "(^[^/\\]+)" "${NEW_ICON_THEME_NAME}" NEW_ICON_THEME_FILE_RELATIVE_PATH "${ICON_THEME_FILE_RELATIVE_PATH}")
                        get_filename_component(ICON_THEME_FILE_DIR "${ICON_THEME_FILE_RELATIVE_PATH}" DIRECTORY)
                        string(REGEX REPLACE "(^[^/\\]+)" "${NEW_ICON_THEME_NAME}" NEW_ICON_THEME_FILE_DIR "${ICON_THEME_FILE_DIR}")
                        file(MAKE_DIRECTORY "${BUILTIN_ICONS_DIR}/${NEW_ICON_THEME_FILE_DIR}")
                        file(COPY "${ICON_THEME_FILE}" DESTINATION "${BUILTIN_ICONS_DIR}/${NEW_ICON_THEME_FILE_DIR}")
                        list(APPEND ICON_THEME_FILES "<file${ICON_THEME_FILE_ALIAS}>${NEW_ICON_THEME_FILE_RELATIVE_PATH}</file>")
                    endforeach()
                    break()
                endif()
                unset(ICON_THEME_PATH)
            endforeach()
            if(NOT ICON_THEME_PATH)
                message(FATAL_ERROR "The specified icon theme \"${ICON_THEME}\" coud not be found.")
            endif()
        endforeach()
        set(BUILTIN_ICON_THEMES_QRC_FILE "${CMAKE_CURRENT_BINARY_DIR}/icons/${META_PROJECT_NAME}_builtinicons.qrc")
        list(REMOVE_DUPLICATES ICON_THEME_FILES)
        string(CONCAT BUILTIN_ICON_THEMES_QRC_FILE_CONTENT "<RCC><qresource prefix=\"/icons\">" ${ICON_THEME_FILES} "</qresource></RCC>")
        file(WRITE "${BUILTIN_ICON_THEMES_QRC_FILE}" "${BUILTIN_ICON_THEMES_QRC_FILE_CONTENT}")
        list(APPEND RES_FILES "${BUILTIN_ICON_THEMES_QRC_FILE}")
    endif()
endif()

# export Qt resources from specified RES_FILES
foreach(RES_FILE ${RES_FILES})
    get_filename_component(RES_EXT ${RES_FILE} EXT)
    if(RES_EXT STREQUAL ".qrc")
        get_filename_component(RES_NAME ${RES_FILE} NAME_WE)
        list(APPEND QT_RESOURCES "${RES_NAME}")
    endif()
endforeach()

# export Qt resources required by static libraries the static library depends on
if(STATIC_LIBRARIES_QT_RESOURCES)
    list(REMOVE_DUPLICATES STATIC_LIBRARIES_QT_RESOURCES)
    list(APPEND QT_RESOURCES ${STATIC_LIBRARIES_QT_RESOURCES})
endif()

# enable Qt resources required by static libraries the shared library or application depends on
if(LIBRARIES_QT_RESOURCES)
    list(REMOVE_DUPLICATES LIBRARIES_QT_RESOURCES)

    # make enabling resources of static dependencies available via config.h
    unset(ENABLE_QT_RESOURCES_OF_STATIC_DEPENDENCIES)
    foreach(QT_RESOURCE ${LIBRARIES_QT_RESOURCES})
        set(ENABLE_QT_RESOURCES_OF_STATIC_DEPENDENCIES
            "${ENABLE_QT_RESOURCES_OF_STATIC_DEPENDENCIES} \\\n    struct initializer_${QT_RESOURCE} { \\\n        initializer_${QT_RESOURCE}() { Q_INIT_RESOURCE(${QT_RESOURCE}); } \\\n        ~initializer_${QT_RESOURCE}() { Q_CLEANUP_RESOURCE(${QT_RESOURCE}); } \\\n    } dummy_${QT_RESOURCE};"
        )
    endforeach()
endif()

# prevent duplicated resources
if(QT_RESOURCES)
    list(REMOVE_DUPLICATES QT_RESOURCES)
endif()

# enable moc, uic and rcc by default for all targets
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
if(WIDGETS_UI_FILES AND WIDGETS_GUI)
    set(CMAKE_AUTOUIC ON)
    if(INSTALL_UI_HEADER)
        # also add install for header files generated by uic
        foreach(UI_FILE WIDGETS_UI_FILES)
            get_filename_component(UI_NAME "${UI_FILE}" NAME_WE)
            install(
                FILES "${CMAKE_CURRENT_BINARY_DIR}/ui_${UI_NAME}.h"
                DESTINATION "include/${META_PROJECT_NAME}/ui"
                COMPONENT ui-header
            )
        endforeach()
    endif()
endif()

set(QT_CONFIGURED YES)