# Get the latest git tag.
set(PADDLE_VERSION $ENV{PADDLE_VERSION})
set(tmp_version "HEAD")
set(TAG_VERSION_REGEX "[0-9]+\\.[0-9]+\\.[0-9]+(\\.(a|b|rc)\\.[0-9]+)?")
set(COMMIT_VERSION_REGEX "[0-9a-f]+[0-9a-f]+[0-9a-f]+[0-9a-f]+[0-9a-f]+")
set(LATEST_PADDLE_VERSION "latest")

while ("${PADDLE_VERSION}" STREQUAL "")
  # Check current branch name
  execute_process(
    COMMAND ${GIT_EXECUTABLE} rev-parse --abbrev-ref ${tmp_version}
    WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}
    OUTPUT_VARIABLE GIT_BRANCH_NAME
    RESULT_VARIABLE GIT_BRANCH_RESULT
    ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
  if (NOT ${GIT_BRANCH_RESULT})
    execute_process(
      COMMAND ${GIT_EXECUTABLE} describe --tags --abbrev=0 --always ${tmp_version}
      WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}
      OUTPUT_VARIABLE GIT_TAG_NAME
      RESULT_VARIABLE GIT_RESULT
      ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
    if (NOT ${GIT_RESULT})
      # Check if current branch is release branch
      if (${GIT_BRANCH_NAME} MATCHES "release/${TAG_VERSION_REGEX}")
        # Check the tag is a correct version
        if (${GIT_TAG_NAME} MATCHES "${COMMIT_VERSION_REGEX}")
          # if no tag was found, set PADDLE_VERSION to "latest"
          set(PADDLE_VERSION "${LATEST_PADDLE_VERSION}")
        elseif (${GIT_TAG_NAME} MATCHES "v${TAG_VERSION_REGEX}")
          string(REPLACE "v" "" PADDLE_VERSION ${GIT_TAG_NAME})
        else()  # otherwise, get the previous git tag name.
          set(tmp_version "${GIT_TAG_NAME}~1")
        endif()
      else()
        execute_process(
          COMMAND ${GIT_EXECUTABLE} describe --exact-match --tags ${tmp_version}
          WORKING_DIRECTORY ${PADDLE_SOURCE_DIR}
          OUTPUT_VARIABLE GIT_EXACT_TAG_NAME
          RESULT_VARIABLE GIT_EXACT_TAG_RESULT
          ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
        if (NOT ${GIT_EXACT_TAG_NAME})
          # Check if current branch is tag branch
          if (${GIT_EXACT_TAG_NAME} MATCHES "v${TAG_VERSION_REGEX}")
            string(REPLACE "v" "" PADDLE_VERSION ${GIT_EXACT_TAG_NAME})
          else()
            set(PADDLE_VERSION "${LATEST_PADDLE_VERSION}")
          endif()
        else()
          # otherwise, we always set PADDLE_VERSION to "latest"
          set(PADDLE_VERSION "${LATEST_PADDLE_VERSION}")
        endif()
      endif()
    else()
      set(PADDLE_VERSION "${LATEST_PADDLE_VERSION}")
      message(WARNING "Cannot add paddle version from git tag")
    endif()
  else()
    set(PADDLE_VERSION "${LATEST_PADDLE_VERSION}")
    message(WARNING "Cannot add paddle version for wrong git branch result")
  endif()
endwhile()

add_definitions(-DPADDLE_VERSION=${PADDLE_VERSION})
message(STATUS "Paddle version is ${PADDLE_VERSION}")