include(GNUInstallDirs)

# If requested, use FHS layout; otherwise fall back to a flat layout.
if(OPTION_INSTALL_FHS)
    set(BINARY_DESTINATION_DIR "${CMAKE_INSTALL_BINDIR}")
    set(DATA_DESTINATION_DIR "${CMAKE_INSTALL_DATADIR}/${BINARY_NAME}")
    set(DOCS_DESTINATION_DIR "${CMAKE_INSTALL_DOCDIR}")
    set(MAN_DESTINATION_DIR "${CMAKE_INSTALL_MANDIR}")
else()
    if(APPLE)
        set(BINARY_DESTINATION_DIR "../MacOS")
    else()
        set(BINARY_DESTINATION_DIR ".")
    endif()
    set(DATA_DESTINATION_DIR ".")
    set(DOCS_DESTINATION_DIR ".")
    set(MAN_DESTINATION_DIR ".")
endif()

install(TARGETS openttd
        RUNTIME
            DESTINATION ${BINARY_DESTINATION_DIR}
            COMPONENT Runtime
        )

install(DIRECTORY
                ${CMAKE_BINARY_DIR}/lang
                ${CMAKE_BINARY_DIR}/baseset
                ${CMAKE_SOURCE_DIR}/bin/ai
                ${CMAKE_SOURCE_DIR}/bin/game
                ${CMAKE_SOURCE_DIR}/bin/scripts
        DESTINATION ${DATA_DESTINATION_DIR}
        COMPONENT language_files)

install(FILES
                ${CMAKE_SOURCE_DIR}/COPYING.md
                ${CMAKE_SOURCE_DIR}/README.md
                ${CMAKE_SOURCE_DIR}/changelog.txt
                ${CMAKE_SOURCE_DIR}/docs/multiplayer.md
                ${CMAKE_SOURCE_DIR}/known-bugs.txt
        DESTINATION ${DOCS_DESTINATION_DIR}
        COMPONENT docs)

# A Linux manual only makes sense when using FHS. Otherwise it is a very odd
# file with little context to what it is.
if(OPTION_INSTALL_FHS)
    set(MAN_SOURCE_FILE ${CMAKE_SOURCE_DIR}/docs/openttd.6)
    set(MAN_BINARY_FILE ${CMAKE_BINARY_DIR}/docs/${BINARY_NAME}.6)
    install(CODE
            "
                execute_process(COMMAND ${CMAKE_COMMAND} -E copy ${MAN_SOURCE_FILE} ${MAN_BINARY_FILE})
                execute_process(COMMAND gzip -9 -n -f ${MAN_BINARY_FILE})
            "
            COMPONENT manual)
    install(FILES
                    ${MAN_BINARY_FILE}.gz
            DESTINATION ${MAN_DESTINATION_DIR}/man6
            COMPONENT manual)
endif()

# TODO -- Media files
# TODO -- Menu files

if(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
    set(ARCHITECTURE "amd64")
else()
    string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" ARCHITECTURE)
endif()

# Windows is a bit more annoying to detect; using the size of void pointer
# seems to be the most robust.
if(WIN32)
    if(CMAKE_SIZEOF_VOID_P EQUAL 8)
        set(ARCHITECTURE "win64")
    else()
        set(ARCHITECTURE "win32")
    endif()
endif()
if(APPLE AND CMAKE_OSX_ARCHITECTURES)
    string(TOLOWER "${CMAKE_OSX_ARCHITECTURES}" ARCHITECTURE)
endif()

set(CPACK_SYSTEM_NAME "${ARCHITECTURE}")

set(CPACK_PACKAGE_NAME "openttd")
set(CPACK_PACKAGE_VENDOR "OpenTTD")
set(CPACK_PACKAGE_DESCRIPTION "OpenTTD")
set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "OpenTTD")
set(CPACK_PACKAGE_HOMEPAGE_URL "https://www.openttd.org/")
set(CPACK_PACKAGE_CONTACT "OpenTTD <info@openttd.org>")
set(CPACK_PACKAGE_INSTALL_DIRECTORY "OpenTTD")
set(CPACK_PACKAGE_CHECKSUM "SHA256")
set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_SOURCE_DIR}/COPYING.md")
set(CPACK_RESOURCE_FILE_README "${CMAKE_SOURCE_DIR}/README.md")
set(CPACK_MONOLITHIC_INSTALL YES)
set(CPACK_PACKAGE_EXECUTABLES "openttd;OpenTTD")
set(CPACK_STRIP_FILES YES)
set(CPACK_OUTPUT_FILE_PREFIX "bundles")

if(APPLE)
    set(CPACK_GENERATOR "Bundle")
    include(PackageBundle)

    set(CPACK_PACKAGE_FILE_NAME "openttd-#CPACK_PACKAGE_VERSION#-macosx-${CPACK_SYSTEM_NAME}")
elseif(WIN32)
    set(CPACK_GENERATOR "ZIP")
    if(OPTION_USE_NSIS)
        list(APPEND CPACK_GENERATOR "NSIS")
        include(PackageNSIS)
    endif()

    set(CPACK_PACKAGE_FILE_NAME "openttd-#CPACK_PACKAGE_VERSION#-windows-${CPACK_SYSTEM_NAME}")
elseif(UNIX)
    # With FHS, we can create deb/rpm/... Without it, they would be horribly broken
    # and not work. The other way around is also true; with FHS they are not
    # usable, and only flat formats work.
    if(NOT OPTION_INSTALL_FHS)
        set(CPACK_GENERATOR "TXZ")
    else()
        find_program(LSB_RELEASE_EXEC lsb_release)
        execute_process(COMMAND ${LSB_RELEASE_EXEC} -is
            OUTPUT_VARIABLE LSB_RELEASE_ID
            OUTPUT_STRIP_TRAILING_WHITESPACE
        )
        if(LSB_RELEASE_ID)
            if(LSB_RELEASE_ID STREQUAL "Ubuntu" OR LSB_RELEASE_ID STREQUAL "Debian")
                execute_process(COMMAND ${LSB_RELEASE_EXEC} -cs
                    OUTPUT_VARIABLE LSB_RELEASE_CODENAME
                    OUTPUT_STRIP_TRAILING_WHITESPACE
                )
                string(TOLOWER "${LSB_RELEASE_ID}-${LSB_RELEASE_CODENAME}" PLATFORM)

                set(CPACK_GENERATOR "DEB")
                include(PackageDeb)
            else()
                set(UNSUPPORTED_PLATFORM_NAME "LSB-based Linux distribution '${LSB_RELEASE_ID}'")
            endif()
        elseif(EXISTS "/etc/os-release")
            file(STRINGS "/etc/os-release" OS_RELEASE_CONTENTS REGEX "^ID=")
            string(REGEX MATCH "ID=(.*)" _ ${OS_RELEASE_CONTENTS})
            set(DISTRO_ID ${CMAKE_MATCH_1})
            if(DISTRO_ID STREQUAL "arch")
                set(PLATFORM "generic")
                set(CPACK_GENERATOR "TXZ")
            else()
                set(UNSUPPORTED_PLATFORM_NAME "Linux distribution '${DISTRO_ID}' from /etc/os-release")
            endif()
        else()
            set(UNSUPPORTED_PLATFORM_NAME "Linux distribution")
        endif()

        if(NOT PLATFORM)
            set(PLATFORM "generic")
            set(CPACK_GENERATOR "TXZ")
            message(WARNING "Unknown ${UNSUPPORTED_PLATFORM_NAME} found for packaging; can only pack to a txz. Please consider creating a Pull Request to add support for this distribution.")
        endif()

        set(CPACK_PACKAGE_FILE_NAME "openttd-#CPACK_PACKAGE_VERSION#-linux-${PLATFORM}-${CPACK_SYSTEM_NAME}")
    endif()

else()
    message(FATAL_ERROR "Unknown OS found for packaging; please consider creating a Pull Request to add support for this OS.")
endif()

include(CPack)