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

list(APPEND CMAKE_MODULE_PATH "${SRC_DIR}/externals/cmake-modules")

# Find the package here with the known path so that the GetGit commands can find it as well
find_package(Git QUIET PATHS "${GIT_EXECUTABLE}")

# generate git/build information
include(GetGitRevisionDescription)
get_git_head_revision(GIT_REF_SPEC GIT_REV)
git_describe(GIT_DESC --always --long --dirty)
git_branch_name(GIT_BRANCH)
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")
if (BUILD_REPOSITORY)
  # regex capture the string nightly or canary into CMAKE_MATCH_1
  string(REGEX MATCH "yuzu-emu/yuzu-?(.*)" 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()

# The variable SRC_DIR must be passed into the script (since it uses the current build directory for all values of CMAKE_*_DIR)
set(VIDEO_CORE "${SRC_DIR}/src/video_core")
set(HASH_FILES
    "${VIDEO_CORE}/renderer_opengl/gl_arb_decompiler.cpp"
    "${VIDEO_CORE}/renderer_opengl/gl_arb_decompiler.h"
    "${VIDEO_CORE}/renderer_opengl/gl_shader_cache.cpp"
    "${VIDEO_CORE}/renderer_opengl/gl_shader_cache.h"
    "${VIDEO_CORE}/renderer_opengl/gl_shader_decompiler.cpp"
    "${VIDEO_CORE}/renderer_opengl/gl_shader_decompiler.h"
    "${VIDEO_CORE}/renderer_opengl/gl_shader_disk_cache.cpp"
    "${VIDEO_CORE}/renderer_opengl/gl_shader_disk_cache.h"
    "${VIDEO_CORE}/shader/decode/arithmetic.cpp"
    "${VIDEO_CORE}/shader/decode/arithmetic_half.cpp"
    "${VIDEO_CORE}/shader/decode/arithmetic_half_immediate.cpp"
    "${VIDEO_CORE}/shader/decode/arithmetic_immediate.cpp"
    "${VIDEO_CORE}/shader/decode/arithmetic_integer.cpp"
    "${VIDEO_CORE}/shader/decode/arithmetic_integer_immediate.cpp"
    "${VIDEO_CORE}/shader/decode/bfe.cpp"
    "${VIDEO_CORE}/shader/decode/bfi.cpp"
    "${VIDEO_CORE}/shader/decode/conversion.cpp"
    "${VIDEO_CORE}/shader/decode/ffma.cpp"
    "${VIDEO_CORE}/shader/decode/float_set.cpp"
    "${VIDEO_CORE}/shader/decode/float_set_predicate.cpp"
    "${VIDEO_CORE}/shader/decode/half_set.cpp"
    "${VIDEO_CORE}/shader/decode/half_set_predicate.cpp"
    "${VIDEO_CORE}/shader/decode/hfma2.cpp"
    "${VIDEO_CORE}/shader/decode/image.cpp"
    "${VIDEO_CORE}/shader/decode/integer_set.cpp"
    "${VIDEO_CORE}/shader/decode/integer_set_predicate.cpp"
    "${VIDEO_CORE}/shader/decode/memory.cpp"
    "${VIDEO_CORE}/shader/decode/texture.cpp"
    "${VIDEO_CORE}/shader/decode/other.cpp"
    "${VIDEO_CORE}/shader/decode/predicate_set_predicate.cpp"
    "${VIDEO_CORE}/shader/decode/predicate_set_register.cpp"
    "${VIDEO_CORE}/shader/decode/register_set_predicate.cpp"
    "${VIDEO_CORE}/shader/decode/shift.cpp"
    "${VIDEO_CORE}/shader/decode/video.cpp"
    "${VIDEO_CORE}/shader/decode/warp.cpp"
    "${VIDEO_CORE}/shader/decode/xmad.cpp"
    "${VIDEO_CORE}/shader/ast.cpp"
    "${VIDEO_CORE}/shader/ast.h"
    "${VIDEO_CORE}/shader/compiler_settings.cpp"
    "${VIDEO_CORE}/shader/compiler_settings.h"
    "${VIDEO_CORE}/shader/control_flow.cpp"
    "${VIDEO_CORE}/shader/control_flow.h"
    "${VIDEO_CORE}/shader/decode.cpp"
    "${VIDEO_CORE}/shader/expr.cpp"
    "${VIDEO_CORE}/shader/expr.h"
    "${VIDEO_CORE}/shader/node.h"
    "${VIDEO_CORE}/shader/node_helper.cpp"
    "${VIDEO_CORE}/shader/node_helper.h"
    "${VIDEO_CORE}/shader/registry.cpp"
    "${VIDEO_CORE}/shader/registry.h"
    "${VIDEO_CORE}/shader/shader_ir.cpp"
    "${VIDEO_CORE}/shader/shader_ir.h"
    "${VIDEO_CORE}/shader/track.cpp"
    "${VIDEO_CORE}/shader/transform_feedback.cpp"
    "${VIDEO_CORE}/shader/transform_feedback.h"
)
set(COMBINED "")
foreach (F IN LISTS HASH_FILES)
    file(READ ${F} TMP)
    set(COMBINED "${COMBINED}${TMP}")
endforeach()
string(MD5 SHADER_CACHE_VERSION "${COMBINED}")
configure_file("${SRC_DIR}/src/common/scm_rev.cpp.in" "scm_rev.cpp" @ONLY)