################################################################################
##
## The University of Illinois/NCSA
## Open Source License (NCSA)
##
## Copyright (c) 2014-2017, Advanced Micro Devices, Inc. All rights reserved.
##
## Developed by:
##
##                 AMD Research and AMD HSA Software Development
##
##                 Advanced Micro Devices, Inc.
##
##                 www.amd.com
##
## Permission is hereby granted, free of charge, to any person obtaining a copy
## of this software and associated documentation files (the "Software"), to
## deal with the Software without restriction, including without limitation
## the rights to use, copy, modify, merge, publish, distribute, sublicense,
## and#or sell copies of the Software, and to permit persons to whom the
## Software is furnished to do so, subject to the following conditions:
##
##  - Redistributions of source code must retain the above copyright notice,
##    this list of conditions and the following disclaimers.
##  - Redistributions in binary form must reproduce the above copyright
##    notice, this list of conditions and the following disclaimers in
##    the documentation and#or other materials provided with the distribution.
##  - Neither the names of Advanced Micro Devices, Inc,
##    nor the names of its contributors may be used to endorse or promote
##    products derived from this Software without specific prior written
##    permission.
##
## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
## IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
## FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
## THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
## OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
## ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
## DEALINGS WITH THE SOFTWARE.
##
################################################################################

## Parses the VERSION_STRING variable and places
## the first, second and third number values in
## the major, minor and patch variables.
function(parse_version VERSION_STRING)

    string(FIND ${VERSION_STRING} "-" STRING_INDEX)

    if(${STRING_INDEX} GREATER -1)
        math(EXPR STRING_INDEX "${STRING_INDEX} + 1")
        string(SUBSTRING ${VERSION_STRING} ${STRING_INDEX} -1 VERSION_BUILD)
    endif()

    string(REGEX MATCHALL "[0123456789]+" VERSIONS ${VERSION_STRING})
    list(LENGTH VERSIONS VERSION_COUNT)

    if(${VERSION_COUNT} GREATER 0)
        list(GET VERSIONS 0 MAJOR)
        set(VERSION_MAJOR
            ${MAJOR}
            PARENT_SCOPE)
        set(TEMP_VERSION_STRING "${MAJOR}")
    endif()

    if(${VERSION_COUNT} GREATER 1)
        list(GET VERSIONS 1 MINOR)
        set(VERSION_MINOR
            ${MINOR}
            PARENT_SCOPE)
        set(TEMP_VERSION_STRING "${TEMP_VERSION_STRING}.${MINOR}")
    endif()

    if(${VERSION_COUNT} GREATER 2)
        list(GET VERSIONS 2 PATCH)
        set(VERSION_PATCH
            ${PATCH}
            PARENT_SCOPE)
        set(TEMP_VERSION_STRING "${TEMP_VERSION_STRING}.${PATCH}")
    endif()

    set(VERSION_STRING
        "${TEMP_VERSION_STRING}"
        PARENT_SCOPE)

endfunction()

## Gets the current version of the repository
## using versioning tags and git describe.
## Passes back a packaging version string
## and a library version string.
function(get_version_from_tag DEFAULT_VERSION_STRING VERSION_PREFIX GIT)
    parse_version(${DEFAULT_VERSION_STRING})

    if(GIT)
        execute_process(
            COMMAND git describe --tags --dirty --long --match ${VERSION_PREFIX}-[0-9.]*
            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
            OUTPUT_VARIABLE GIT_TAG_STRING
            OUTPUT_STRIP_TRAILING_WHITESPACE
            RESULT_VARIABLE RESULT)
        if(${RESULT} EQUAL 0)
            parse_version(${GIT_TAG_STRING})
        endif()

    endif()

    set(VERSION_STRING
        "${VERSION_STRING}"
        PARENT_SCOPE)
    set(VERSION_MAJOR
        "${VERSION_MAJOR}"
        PARENT_SCOPE)
    set(VERSION_MINOR
        "${VERSION_MINOR}"
        PARENT_SCOPE)
    set(VERSION_PATCH
        "${VERSION_PATCH}"
        PARENT_SCOPE)
endfunction()

function(num_change_since_prev_pkg VERSION_PREFIX)
    find_program(
        get_commits
        NAMES version_util.sh
        PATHS ${CMAKE_CURRENT_SOURCE_DIR}/cmake_modules)
    if(get_commits)
        execute_process(
            COMMAND ${get_commits} -c ${VERSION_PREFIX}
            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
            OUTPUT_VARIABLE NUM_COMMITS
            OUTPUT_STRIP_TRAILING_WHITESPACE
            RESULT_VARIABLE RESULT)

        set(NUM_COMMITS
            "${NUM_COMMITS}"
            PARENT_SCOPE)

        if(${RESULT} EQUAL 0)
            message("${NUM_COMMITS} were found since previous release")
        else()
            message("Unable to determine number of commits since previous release")
        endif()
    else()
        message("WARNING: Didn't find version_util.sh")
        set(NUM_COMMITS
            "unknown"
            PARENT_SCOPE)
    endif()
endfunction()