cmake_minimum_required(VERSION 3.0)

project(qtprotobuf)

find_package(Protobuf)
if (NOT Protobuf_FOUND OR Protobuf_VERSION VERSION_LESS "3.0.0")
    include(cmake/DownloadProject.cmake)
    download_project(PROJ                Protobuf
                     GIT_REPOSITORY      https://github.com/protocolbuffers/protobuf.git
                     GIT_TAG             3.7.x
    )
    set(protobuf_BUILD_TESTS OFF CACHE BOOL "Disable protobuf tests build" FORCE)
    set(Protobuf_PROTOC_EXECUTABLE protoc)
    add_subdirectory("${Protobuf_SOURCE_DIR}/cmake" ${Protobuf_BINARY_DIR})
endif()

# grpc target requires QT version not less than 5.11
# earlier versions do not provide required Http2DirectAttribute: https://doc.qt.io/qt-5/whatsnew511.html
find_package(Qt5 COMPONENTS Core Network REQUIRED)
if (Qt5Core_VERSION VERSION_LESS "5.11.0")
    message(FATAL_ERROR "Required Qt version is 5.11+")
endif()

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

if(UNIX)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Werror")
elseif(WIN32)
    set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} "-Wall" "-Werror")
    #Needs to set path to protobuf libraries
    set(PROTOBUF_INSTALATION_PATH "")
endif()

if(DEFINED $ENV{MAKE_TESTS})
    set(MAKE_TESTS ${MAKE_TESTS})
elseif(NOT DEFINED MAKE_TESTS)
    set(MAKE_TESTS ON)
endif()

add_subdirectory("src/protobuf")
add_subdirectory("src/grpc")
add_subdirectory("src/generator")

if(MAKE_TESTS)
    set(testgeneration "test_generation")
    set(TESTS_OUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/tests)
    file(MAKE_DIRECTORY ${TESTS_OUT_DIR})
    file(GLOB PROTO_FILES ABSOLUTE ${CMAKE_CURRENT_SOURCE_DIR}/tests/proto/*.proto)
    if(WIN32)
        set(Protobuf_PROTOC_EXECUTABLE ${PROTOBUF_INSTALATION_PATH}/bin/protoc.exe)
    endif()

    add_custom_target(${testgeneration})
    add_custom_command(TARGET ${testgeneration}
            COMMAND ${Protobuf_PROTOC_EXECUTABLE} --plugin=protoc-gen-${PROJECT_NAME}=$<TARGET_FILE:${PROJECT_NAME}> --qtprotobuf_out=${TESTS_OUT_DIR} -I=${CMAKE_CURRENT_SOURCE_DIR}/tests/proto/ ${PROTO_FILES}
            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/tests/proto/
            DEPENDS ${PROJECT_NAME} ${PROTO_FILES}
            COMMENT "Generating test headers"
            )

    add_dependencies(${testgeneration} ${PROJECT_NAME})
    add_subdirectory("tests")
endif()