# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

# Find the Atlas (and Lapack) libraries
#
# The following variables are optionally searched for defaults
#  Atlas_ROOT_DIR:            Base directory where all Atlas components are found
#  Atlas_NEED_LAPACK:         Whether need lapack libraries
#
# The following are set after configuration is done:
#  Atlas_FOUND
#  Atlas_INCLUDE_DIRS
#  Atlas_LIBRARIES
#  Atlas_LIBRARYRARY_DIRS

set(Atlas_INCLUDE_SEARCH_PATHS
  /usr/include/atlas
  /usr/include/atlas-base
  $ENV{Atlas_ROOT_DIR}
  $ENV{Atlas_ROOT_DIR}/include
  $ENV{Atlas_ROOT_DIR}/include/atlas
)

set(Atlas_LIB_SEARCH_PATHS
  /usr/lib/atlas
  /usr/lib/atlas-base
  $ENV{Atlas_ROOT_DIR}
  $ENV{Atlas_ROOT_DIR}/lib
)

find_path(Atlas_CBLAS_INCLUDE_DIR   NAMES cblas.h   PATHS ${Atlas_INCLUDE_SEARCH_PATHS})
find_library(Atlas_CBLAS_LIBRARY NAMES  ptcblas_r ptcblas cblas_r cblas PATHS ${Atlas_LIB_SEARCH_PATHS})
find_library(Atlas_BLAS_LIBRARY NAMES   atlas_r   atlas                 PATHS ${Atlas_LIB_SEARCH_PATHS})

set(LOOKED_FOR
  Atlas_CBLAS_INCLUDE_DIR

  Atlas_CBLAS_LIBRARY
  Atlas_BLAS_LIBRARY
)

if(Atlas_NEED_LAPACK)
  find_path(Atlas_CLAPACK_INCLUDE_DIR NAMES clapack.h PATHS ${Atlas_INCLUDE_SEARCH_PATHS})
  find_library(Atlas_LAPACK_LIBRARY NAMES alapack_r alapack lapack_atlas  PATHS ${Atlas_LIB_SEARCH_PATHS})
  set(LOOKED_FOR ${LOOKED_FOR} Atlas_CLAPACK_INCLUDE_DIR Atlas_LAPACK_LIBRARY)
endif(Atlas_NEED_LAPACK)

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Atlas DEFAULT_MSG ${LOOKED_FOR})

if(ATLAS_FOUND)
  set(Atlas_INCLUDE_DIR ${Atlas_CBLAS_INCLUDE_DIR} ${Atlas_CLAPACK_INCLUDE_DIR})
  set(Atlas_LIBRARIES ${Atlas_LAPACK_LIBRARY} ${Atlas_CBLAS_LIBRARY} ${Atlas_BLAS_LIBRARY})
  mark_as_advanced(${LOOKED_FOR})

  message(STATUS "Found Atlas (include: ${Atlas_CBLAS_INCLUDE_DIR}, library: ${Atlas_BLAS_LIBRARY})")
endif(ATLAS_FOUND)