# Copyright (c) 2022, ETH Zurich and UNC Chapel Hill.
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#
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# Author: Johannes L. Schoenberger (jsch-at-demuc-dot-de)

# Find package module for Metis library.
#
# The following variables are set by this module:
#
#   METIS_FOUND: TRUE if Metis is found.
#   METIS_INCLUDE_DIRS: Include directories for Metis.
#   METIS_LIBRARIES: Libraries required to link Metis.
#
# The following variables control the behavior of this module:
#
# METIS_INCLUDE_DIR_HINTS: List of additional directories in which to
#                              search for Metis includes.
# METIS_LIBRARY_DIR_HINTS: List of additional directories in which to
#                              search for Metis libraries.

set(METIS_INCLUDE_DIR_HINTS "" CACHE PATH "Metis include directory")
set(METIS_LIBRARY_DIR_HINTS "" CACHE PATH "Metis library directory")

unset(METIS_FOUND)
unset(METIS_INCLUDE_DIRS)
unset(METIS_LIBRARIES)

list(APPEND METIS_CHECK_INCLUDE_DIRS
    ${METIS_INCLUDE_DIR_HINTS}
    /usr/include
    /usr/local/include
    /opt/include
    /opt/local/include
)

list(APPEND METIS_CHECK_LIBRARY_DIRS
    ${METIS_LIBRARY_DIR_HINTS}
    /usr/lib
    /usr/local/lib
    /opt/lib
    /opt/local/lib
)

find_path(METIS_INCLUDE_DIRS
    NAMES
    metis.h
    PATHS
    ${METIS_CHECK_INCLUDE_DIRS})
find_library(METIS_LIBRARIES
    NAMES
    metis
    PATHS
    ${METIS_CHECK_LIBRARY_DIRS})

if(METIS_INCLUDE_DIRS AND METIS_LIBRARIES)
    set(METIS_FOUND TRUE)
endif()

if(METIS_FOUND)
    message(STATUS "Found Metis")
    message(STATUS "  Includes : ${METIS_INCLUDE_DIRS}")
    message(STATUS "  Libraries : ${METIS_LIBRARIES}")
else()
    if(METIS_FIND_REQUIRED)
        message(FATAL_ERROR "Could not find Metis")
    endif()
endif()