cmake_minimum_required (VERSION 3.4)

#
# Barrier Version
#
if (NOT DEFINED BARRIER_VERSION_MAJOR)
    if (DEFINED ENV{BARRIER_VERSION_MAJOR})
        set (BARRIER_VERSION_MAJOR $ENV{BARRIER_VERSION_MAJOR})
    else()
        set (BARRIER_VERSION_MAJOR 1)
    endif()
endif()

if (NOT DEFINED BARRIER_VERSION_MINOR)
    if (DEFINED ENV{BARRIER_VERSION_MINOR})
        set (BARRIER_VERSION_MINOR $ENV{BARRIER_VERSION_MINOR})
    else()
        set (BARRIER_VERSION_MINOR 9)
    endif()
endif()

if (NOT DEFINED BARRIER_VERSION_PATCH)
    if (DEFINED ENV{BARRIER_VERSION_PATCH})
        set (BARRIER_VERSION_PATCH $ENV{BARRIER_VERSION_PATCH})
    else()
        set (BARRIER_VERSION_PATCH 0)
        message (WARNING "Barrier version wasn't set. Set to ${BARRIER_VERSION_MAJOR}.${BARRIER_VERSION_MINOR}.${BARRIER_VERSION_PATCH}")
    endif()
endif()

if (NOT DEFINED BARRIER_VERSION_STAGE)
    if (DEFINED ENV{BARRIER_VERSION_STAGE})
        set (BARRIER_VERSION_STAGE $ENV{BARRIER_VERSION_STAGE})
    else()
        set (BARRIER_VERSION_STAGE "snapshot")
    endif()
endif()

if (NOT DEFINED BARRIER_REVISION)
    if (DEFINED ENV{GIT_COMMIT})
        string (SUBSTRING $ENV{GIT_COMMIT} 0 8 BARRIER_REVISION)
    elseif (BARRIER_VERSION_STAGE STREQUAL "snapshot")
        execute_process (
            COMMAND git rev-parse --short=8 HEAD
            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
            OUTPUT_VARIABLE BARRIER_REVISION
            OUTPUT_STRIP_TRAILING_WHITESPACE
        )
    endif()
endif()

if (DEFINED BARRIER_REVISION)
    string(LENGTH ${BARRIER_REVISION} BARRIER_REVISION_LENGTH)
    if (NOT ((BARRIER_REVISION MATCHES "^[a-f0-9]+") AND (BARRIER_REVISION_LENGTH EQUAL "8")))
        message (FATAL_ERROR "BARRIER_REVISION ('${BARRIER_REVISION}') should be a short commit hash")
    endif()
    unset (BARRIER_REVISION_LENGTH)
else()
	set (BARRIER_REVISION "0badc0de")
endif()

if (DEFINED ENV{BUILD_NUMBER})
    set (BARRIER_BUILD_NUMBER $ENV{BUILD_NUMBER})
else()
    set (BARRIER_BUILD_NUMBER 1)
endif()

string (TIMESTAMP BARRIER_BUILD_DATE "%Y%m%d" UTC)
set (BARRIER_SNAPSHOT_INFO ".${BARRIER_VERSION_STAGE}.${BARRIER_REVISION}")

if (BARRIER_VERSION_STAGE STREQUAL "snapshot")
    set (BARRIER_VERSION_TAG "${BARRIER_VERSION_STAGE}.b${BARRIER_BUILD_NUMBER}-${BARRIER_REVISION}")
else()
    set (BARRIER_VERSION_TAG "${BARRIER_VERSION_STAGE}")
endif()

set (BARRIER_VERSION "${BARRIER_VERSION_MAJOR}.${BARRIER_VERSION_MINOR}.${BARRIER_VERSION_PATCH}")
set (BARRIER_VERSION_STRING "${BARRIER_VERSION}-${BARRIER_VERSION_TAG}")
message (STATUS "Full Barrier version string is '" ${BARRIER_VERSION_STRING} "'")

add_definitions (-DBARRIER_VERSION="${BARRIER_VERSION}")
add_definitions (-DBARRIER_VERSION_STRING="${BARRIER_VERSION_STRING}")
add_definitions (-DBARRIER_REVISION="${BARRIER_REVISION}")
add_definitions (-DBARRIER_BUILD_DATE="${BARRIER_BUILD_DATE}")
add_definitions (-DBARRIER_BUILD_NUMBER=${BARRIER_BUILD_NUMBER})

if (BARRIER_DEVELOPER_MODE)
    add_definitions (-DBARRIER_DEVELOPER_MODE=1)
endif()