# Distributed under the MIT License.
# See LICENSE.txt for details.

# Find Scotch: https://www.labri.fr/perso/pelegrin/scotch/
# If not in one of the default paths specify -D SCOTCH_ROOT=/path/to/Scotch
# to search there as well.

if(NOT SCOTCH_ROOT)
  # Need to set to empty to avoid warnings with --warn-uninitialized
  set(SCOTCH_ROOT "")
  set(SCOTCH_ROOT $ENV{SCOTCH_ROOT})
endif()

# Find the Scotch include directory
find_path(SCOTCH_INCLUDE_DIR scotch.h
  PATH_SUFFIXES include
  HINTS ${SCOTCH_ROOT})

find_library(SCOTCH_LIB
  NAMES scotch
  PATH_SUFFIXES lib64 lib
  HINTS ${SCOTCH_ROOT})

find_library(SCOTCH_ERR_LIB
  NAMES scotcherr
  PATH_SUFFIXES lib64 lib
  HINTS ${SCOTCH_ROOT})

set(SCOTCH_LIBRARIES "${SCOTCH_LIB};${SCOTCH_ERR_LIB}")

set(SCOTCH_VERSION "")

file(READ "${SCOTCH_INCLUDE_DIR}/scotch.h" SCOTCH_FIND_HEADER_CONTENTS)

set(SCOTCH_MAJOR_PREFIX "#define SCOTCH_VERSION ")
set(SCOTCH_MINOR_PREFIX "#define SCOTCH_RELEASE ")
set(SCOTCH_PATCH_PREFIX "#define SCOTCH_PATCHLEVEL ")

string(REGEX MATCH "${SCOTCH_MAJOR_PREFIX}[0-9]+"
  SCOTCH_MAJOR_VERSION "${SCOTCH_FIND_HEADER_CONTENTS}")
string(REPLACE "${SCOTCH_MAJOR_PREFIX}" "" SCOTCH_MAJOR_VERSION
  "${SCOTCH_MAJOR_VERSION}")

string(REGEX MATCH "${SCOTCH_MINOR_PREFIX}[0-9]+"
  SCOTCH_MINOR_VERSION "${SCOTCH_FIND_HEADER_CONTENTS}")
string(REPLACE "${SCOTCH_MINOR_PREFIX}" "" SCOTCH_MINOR_VERSION
  "${SCOTCH_MINOR_VERSION}")

string(REGEX MATCH "${SCOTCH_PATCH_PREFIX}[0-9]+"
  SCOTCH_SUBMINOR_VERSION "${SCOTCH_FIND_HEADER_CONTENTS}")
string(REPLACE "${SCOTCH_PATCH_PREFIX}" "" SCOTCH_SUBMINOR_VERSION
  "${SCOTCH_SUBMINOR_VERSION}")

set(SCOTCH_VERSION
  "${SCOTCH_MAJOR_VERSION}.${SCOTCH_MINOR_VERSION}.${SCOTCH_SUBMINOR_VERSION}"
  )

set(Scotch_VERSION ${SCOTCH_VERSION})

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(
  Scotch
  FOUND_VAR SCOTCH_FOUND
  REQUIRED_VARS SCOTCH_INCLUDE_DIR SCOTCH_LIBRARIES
  VERSION_VAR SCOTCH_VERSION)
mark_as_advanced(SCOTCH_INCLUDE_DIR SCOTCH_LIBRARIES
  SCOTCH_MAJOR_VERSION SCOTCH_MINOR_VERSION SCOTCH_PATCH_VERSION
  SCOTCH_VERSION Scotch_VERSION)