# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#-----------------------------------------------------------------------------

function(catch_discover_tests TARGET)
    cmake_parse_arguments(
            ""
            ""
            "TEST_PREFIX;TEST_SUFFIX;WORKING_DIRECTORY;TEST_LIST;REPORTER;OUTPUT_DIR;OUTPUT_PREFIX;OUTPUT_SUFFIX"
            "TEST_SPEC;EXTRA_ARGS;PROPERTIES"
            ${ARGN}
    )

    if(NOT _WORKING_DIRECTORY)
        set(_WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
    endif()
    if(NOT _TEST_LIST)
        set(_TEST_LIST ${TARGET}_TESTS)
    endif()

    ## Generate a unique name based on the extra arguments
    string(SHA1 args_hash "${_TEST_SPEC} ${_EXTRA_ARGS} ${_REPORTER} ${_OUTPUT_DIR} ${_OUTPUT_PREFIX} ${_OUTPUT_SUFFIX}")
    string(SUBSTRING ${args_hash} 0 7 args_hash)

    # Define rule to generate test list for aforementioned test executable
    set(ctest_include_file "${CMAKE_CURRENT_BINARY_DIR}/${TARGET}_include-${args_hash}.cmake")
    set(ctest_tests_file "${CMAKE_CURRENT_BINARY_DIR}/${TARGET}_tests-${args_hash}.cmake")
    get_property(crosscompiling_emulator
            TARGET ${TARGET}
            PROPERTY CROSSCOMPILING_EMULATOR
            )
    add_custom_command(
            TARGET ${TARGET} POST_BUILD
            BYPRODUCTS "${ctest_tests_file}"
            COMMAND "${CMAKE_COMMAND}"
            -D "TEST_TARGET=${TARGET}"
            -D "TEST_EXECUTABLE=$<TARGET_FILE:${TARGET}>"
            -D "TEST_EXECUTOR=${crosscompiling_emulator}"
            -D "TEST_WORKING_DIR=${_WORKING_DIRECTORY}"
            -D "TEST_SPEC=${_TEST_SPEC}"
            -D "TEST_EXTRA_ARGS=${_EXTRA_ARGS}"
            -D "TEST_PROPERTIES=${_PROPERTIES}"
            -D "TEST_PREFIX=${_TEST_PREFIX}"
            -D "TEST_SUFFIX=${_TEST_SUFFIX}"
            -D "TEST_LIST=${_TEST_LIST}"
            -D "TEST_REPORTER=${_REPORTER}"
            -D "TEST_OUTPUT_DIR=${_OUTPUT_DIR}"
            -D "TEST_OUTPUT_PREFIX=${_OUTPUT_PREFIX}"
            -D "TEST_OUTPUT_SUFFIX=${_OUTPUT_SUFFIX}"
            -D "CTEST_FILE=${ctest_tests_file}"
            -P "${_CATCH_DISCOVER_TESTS_SCRIPT}"
            VERBATIM
    )

    file(WRITE "${ctest_include_file}"
            "if(EXISTS \"${ctest_tests_file}\")\n"
            "  include(\"${ctest_tests_file}\")\n"
            "else()\n"
            "  add_test(${TARGET}_NOT_BUILT-${args_hash} ${TARGET}_NOT_BUILT-${args_hash})\n"
            "endif()\n"
            )

    if(NOT ${CMAKE_VERSION} VERSION_LESS "3.10.0")
        # Add discovered tests to directory TEST_INCLUDE_FILES
        set_property(DIRECTORY
                APPEND PROPERTY TEST_INCLUDE_FILES "${ctest_include_file}"
                )
    else()
        # Add discovered tests as directory TEST_INCLUDE_FILE if possible
        get_property(test_include_file_set DIRECTORY PROPERTY TEST_INCLUDE_FILE SET)
        if (NOT ${test_include_file_set})
            set_property(DIRECTORY
                    PROPERTY TEST_INCLUDE_FILE "${ctest_include_file}"
                    )
        else()
            message(FATAL_ERROR
                    "Cannot set more than one TEST_INCLUDE_FILE"
                    )
        endif()
    endif()

endfunction()

###############################################################################

set(_CATCH_DISCOVER_TESTS_SCRIPT
        ${CMAKE_CURRENT_LIST_DIR}/CatchAddTests.cmake
        CACHE INTERNAL "Catch2 full path to CatchAddTests.cmake helper file"
        )