cmake_minimum_required(VERSION 3.5)

set(API_VERSION "0.6")
project(qmatrixclient VERSION "${API_VERSION}.0" LANGUAGES CXX)

option(QMATRIXCLIENT_INSTALL_EXAMPLE "install qmc-example application" ON)

include(CheckCXXCompilerFlag)
if (NOT WIN32)
    include(GNUInstallDirs)
endif(NOT WIN32)

# Instruct CMake to run moc automatically when needed.
set(CMAKE_AUTOMOC ON)

# Set a default build type if none was specified
if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
  message(STATUS "Setting build type to 'Debug' as none was specified")
  set(CMAKE_BUILD_TYPE Debug CACHE STRING "Choose the type of build" FORCE)
  # Set the possible values of build type for cmake-gui
  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release"
    "MinSizeRel" "RelWithDebInfo")
endif()

if (NOT CMAKE_INSTALL_LIBDIR)
    set(CMAKE_INSTALL_LIBDIR ".")
endif()

if (NOT CMAKE_INSTALL_BINDIR)
    set(CMAKE_INSTALL_BINDIR ".")
endif()

if (NOT CMAKE_INSTALL_INCLUDEDIR)
    set(CMAKE_INSTALL_INCLUDEDIR "include")
endif()

set(CMAKE_CXX_STANDARD 14)

foreach (FLAG all "" pedantic extra error=return-type no-unused-parameter no-gnu-zero-variadic-macro-arguments)
    CHECK_CXX_COMPILER_FLAG("-W${FLAG}" WARN_${FLAG}_SUPPORTED)
    if ( WARN_${FLAG}_SUPPORTED AND NOT CMAKE_CXX_FLAGS MATCHES "(^| )-W?${FLAG}($| )")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -W${FLAG}")
    endif ()
endforeach ()

# Qt 5.6+ is the formal requirement but for the sake of supporting UBPorts
# upstream Qt 5.4 is required.
find_package(Qt5 5.4.1 REQUIRED Network Gui Multimedia)
get_filename_component(Qt5_Prefix "${Qt5_DIR}/../../../.." ABSOLUTE)

if (GTAD_PATH)
    get_filename_component(ABS_GTAD_PATH "${GTAD_PATH}" PROGRAM)
endif ()
if (MATRIX_DOC_PATH)
    get_filename_component(ABS_API_DEF_PATH "${MATRIX_DOC_PATH}/api" REALPATH)
endif ()
if (ABS_GTAD_PATH AND ABS_API_DEF_PATH)
    if (NOT CLANG_FORMAT)
        set(CLANG_FORMAT clang-format)
    endif()
    get_filename_component(ABS_CLANG_FORMAT "${CLANG_FORMAT}" PROGRAM)
endif()

message( STATUS )
message( STATUS "=============================================================================" )
message( STATUS "                       libqmatrixclient Build Information" )
message( STATUS "=============================================================================" )
message( STATUS "Version: ${PROJECT_VERSION}, API version: ${API_VERSION}")
if (CMAKE_BUILD_TYPE)
    message( STATUS "Build type: ${CMAKE_BUILD_TYPE}")
endif(CMAKE_BUILD_TYPE)
message( STATUS "Using compiler: ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION}" )
message( STATUS "Using Qt ${Qt5_VERSION} at ${Qt5_Prefix}" )
if (ABS_API_DEF_PATH AND ABS_GTAD_PATH)
    message( STATUS "Generating API stubs enabled (use --target update-api)" )
    message( STATUS "  Using GTAD at ${ABS_GTAD_PATH}" )
    message( STATUS "  Using API files at ${ABS_API_DEF_PATH}" )
    if (ABS_CLANG_FORMAT)
        message( STATUS "clang-format is at ${ABS_CLANG_FORMAT}")
    else ()
        message( STATUS "${CLANG_FORMAT} is NOT FOUND; --target update-format-api disabled")
    endif ()
endif ()
message( STATUS "=============================================================================" )
message( STATUS )

# Set up source files
set(libqmatrixclient_SRCS
    lib/networkaccessmanager.cpp
    lib/connectiondata.cpp
    lib/connection.cpp
    lib/logging.cpp
    lib/room.cpp
    lib/user.cpp
    lib/avatar.cpp
    lib/syncdata.cpp
    lib/settings.cpp
    lib/networksettings.cpp
    lib/converters.cpp
    lib/util.cpp
    lib/eventitem.cpp
    lib/events/event.cpp
    lib/events/roomevent.cpp
    lib/events/stateevent.cpp
    lib/events/eventcontent.cpp
    lib/events/roomcreateevent.cpp
    lib/events/roomtombstoneevent.cpp
    lib/events/roommessageevent.cpp
    lib/events/roommemberevent.cpp
    lib/events/typingevent.cpp
    lib/events/receiptevent.cpp
    lib/events/callanswerevent.cpp
    lib/events/callcandidatesevent.cpp
    lib/events/callhangupevent.cpp
    lib/events/callinviteevent.cpp
    lib/events/directchatevent.cpp
    lib/jobs/requestdata.cpp
    lib/jobs/basejob.cpp
    lib/jobs/syncjob.cpp
    lib/jobs/mediathumbnailjob.cpp
    lib/jobs/downloadfilejob.cpp
)

set(CSAPI_DIR csapi)
set(ASAPI_DEF_DIR application-service/definitions)
set(ISAPI_DEF_DIR identity/definitions)

foreach (D ${CSAPI_DIR} ${ASAPI_DEF_DIR} ${ISAPI_DEF_DIR})
    aux_source_directory(lib/${D} api_SRCS)
endforeach()

# Make no mistake: CMake cannot run gtad first and then populate the list of
# resulting api_SRCS files. In other words, placing the above foreach after
# the custom targets definition won't bring the desired result:
# CMake will execute it at cmake invocation and gtad will only run later
# when building the update-api target. If you see that gtad has created
# new files you have to re-run cmake.
# TODO: check `file(GLOB_RECURSE ... CONFIGURE_DEPENDS)` (from CMake 3.14)
if (MATRIX_DOC_PATH AND GTAD_PATH)
    set(FULL_CSAPI_DIR lib/${CSAPI_DIR})
    set(FULL_CSAPI_SRC_DIR ${ABS_API_DEF_PATH}/client-server)
    file(GLOB_RECURSE API_DEFS RELATIVE ${PROJECT_SOURCE_DIR}
        ${FULL_CSAPI_SRC_DIR}/*.yaml
        ${ABS_API_DEF_PATH}/${ASAPI_DEF_DIR}/*.yaml
        ${ABS_API_DEF_PATH}/${ISAPI_DEF_DIR}/*.yaml
    )
    add_custom_target(update-api
        ${ABS_GTAD_PATH} --config ${CSAPI_DIR}/gtad.yaml --out ${CSAPI_DIR}
            ${FULL_CSAPI_SRC_DIR}
            old_sync.yaml- room_initial_sync.yaml- # deprecated
            sync.yaml- # we have a better handcrafted implementation
        WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/lib
        SOURCES ${FULL_CSAPI_DIR}/gtad.yaml
                ${FULL_CSAPI_DIR}/{{base}}.h.mustache
                ${FULL_CSAPI_DIR}/{{base}}.cpp.mustache
                ${API_DEFS}
        VERBATIM
    )
    if (CLANG_FORMAT)
        set(api_HDRS ${api_SRCS})
        list(TRANSFORM api_HDRS REPLACE ".cpp$" ".h")
        set(CLANG_FORMAT_ARGS -i -sort-includes -verbose)
        add_custom_target(update-format-api
            COMMAND ${ABS_CLANG_FORMAT} ${CLANG_FORMAT_ARGS} ${api_SRCS}
            COMMAND ${ABS_CLANG_FORMAT} ${CLANG_FORMAT_ARGS} ${api_HDRS}
            DEPENDS update-api
            WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
            VERBATIM
            SOURCES .clang-format
        )
    endif()
endif()

set(example_SRCS examples/qmc-example.cpp)

add_library(QMatrixClient ${libqmatrixclient_SRCS} ${api_SRCS})
set_property(TARGET QMatrixClient PROPERTY VERSION "${PROJECT_VERSION}")
set_property(TARGET QMatrixClient PROPERTY SOVERSION ${API_VERSION} )
set_property(TARGET QMatrixClient PROPERTY
             INTERFACE_QMatrixClient_MAJOR_VERSION ${API_VERSION})
set_property(TARGET QMatrixClient APPEND PROPERTY
             COMPATIBLE_INTERFACE_STRING QMatrixClient_MAJOR_VERSION)

target_include_directories(QMatrixClient PUBLIC
    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/lib>
    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
)
target_link_libraries(QMatrixClient Qt5::Core Qt5::Network Qt5::Gui Qt5::Multimedia)

add_executable(qmc-example ${example_SRCS})
target_link_libraries(qmc-example Qt5::Core QMatrixClient)
configure_file(QMatrixClient.pc.in ${CMAKE_CURRENT_BINARY_DIR}/QMatrixClient.pc @ONLY NEWLINE_STYLE UNIX)

# Installation

install(TARGETS QMatrixClient EXPORT QMatrixClientTargets
        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
        INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
)
install(DIRECTORY lib/ DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
        FILES_MATCHING PATTERN "*.h")

include(CMakePackageConfigHelpers)
# NB: SameMajorVersion doesn't really work yet, as we're within 0.x trail.
# Maybe consider jumping the gun and releasing 1.0, as semver advises?
write_basic_package_version_file(
    "${CMAKE_CURRENT_BINARY_DIR}/QMatrixClient/QMatrixClientConfigVersion.cmake"
    COMPATIBILITY SameMajorVersion
)

export(PACKAGE QMatrixClient)
export(EXPORT QMatrixClientTargets
    FILE "${CMAKE_CURRENT_BINARY_DIR}/QMatrixClient/QMatrixClientTargets.cmake")
configure_file(cmake/QMatrixClientConfig.cmake
    "${CMAKE_CURRENT_BINARY_DIR}/QMatrixClient/QMatrixClientConfig.cmake"
    COPYONLY
)

set(ConfigFilesLocation "${CMAKE_INSTALL_LIBDIR}/cmake/QMatrixClient")
install(EXPORT QMatrixClientTargets
        FILE QMatrixClientTargets.cmake DESTINATION ${ConfigFilesLocation})

install(FILES cmake/QMatrixClientConfig.cmake
    "${CMAKE_CURRENT_BINARY_DIR}/QMatrixClient/QMatrixClientConfigVersion.cmake"
    DESTINATION ${ConfigFilesLocation}
)
# Only available from CMake 3.7; reserved for future use
#install(EXPORT_ANDROID_MK QMatrixClientTargets DESTINATION share/ndk-modules)

if (WIN32)
    install(FILES mime/packages/freedesktop.org.xml DESTINATION mime/packages)
endif (WIN32)

if (QMATRIXCLIENT_INSTALL_EXAMPLE)
    install(TARGETS qmc-example RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
endif (QMATRIXCLIENT_INSTALL_EXAMPLE)

if (UNIX AND NOT APPLE)
    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/QMatrixClient.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
endif()