# SPDX-FileCopyrightText: 2019 sudachi Emulator Project
# SPDX-License-Identifier: GPL-2.0-or-later

# Gets a UTC timestamp and sets the provided variable to it
function(get_timestamp _var)
    string(TIMESTAMP timestamp UTC)
    set(${_var} "${timestamp}" PARENT_SCOPE)
endfunction()

# generate git/build information
include(GetGitRevisionDescription)
if(NOT GIT_REF_SPEC)
    get_git_head_revision(GIT_REF_SPEC GIT_REV)
endif()
if(NOT GIT_DESC)
    git_describe(GIT_DESC --always --long --dirty)
endif()
if (NOT GIT_BRANCH)
  git_branch_name(GIT_BRANCH)
endif()
get_timestamp(BUILD_DATE)

# Generate cpp with Git revision from template
# Also if this is a CI build, add the build name (ie: Nightly, Canary) to the scm_rev file as well
set(REPO_NAME "")
set(BUILD_VERSION "0")
set(BUILD_ID ${DISPLAY_VERSION})
if (BUILD_REPOSITORY)
  # regex capture the string nightly or canary into CMAKE_MATCH_1
  string(REGEX MATCH "sudachi-emu/sudachi-?(.*)" OUTVAR ${BUILD_REPOSITORY})
  if ("${CMAKE_MATCH_COUNT}" GREATER 0)
    # capitalize the first letter of each word in the repo name.
    string(REPLACE "-" ";" REPO_NAME_LIST ${CMAKE_MATCH_1})
    foreach(WORD ${REPO_NAME_LIST})
      string(SUBSTRING ${WORD} 0 1 FIRST_LETTER)
      string(SUBSTRING ${WORD} 1 -1 REMAINDER)
      string(TOUPPER ${FIRST_LETTER} FIRST_LETTER)
      set(REPO_NAME "${REPO_NAME}${FIRST_LETTER}${REMAINDER}")
    endforeach()
    if (BUILD_TAG)
      string(REGEX MATCH "${CMAKE_MATCH_1}-([0-9]+)" OUTVAR ${BUILD_TAG})
      if (${CMAKE_MATCH_COUNT} GREATER 0)
        set(BUILD_VERSION ${CMAKE_MATCH_1})
      endif()
      if (BUILD_VERSION)
        # This leaves a trailing space on the last word, but we actually want that
        # because of how it's styled in the title bar.
        set(BUILD_FULLNAME "${REPO_NAME} ${BUILD_VERSION} ")
      else()
        set(BUILD_FULLNAME "")
      endif()
    endif()
  endif()
endif()

configure_file(scm_rev.cpp.in scm_rev.cpp @ONLY)