# SPQR lib usually requires linking to a blas and lapack library.
# It is up to the user of this module to find a BLAS and link to it.

# SPQR lib requires Cholmod, colamd and amd as well.
# FindCholmod.cmake can be used to find those packages before finding spqr

if (SPQR_INCLUDES AND SPQR_LIBRARIES)
    set(SPQR_FIND_QUIETLY TRUE)
endif (SPQR_INCLUDES AND SPQR_LIBRARIES)

find_path(SPQR_INCLUDES
        NAMES
        SuiteSparseQR.hpp
        PATHS
        $ENV{SPQRDIR}
        ${INCLUDE_INSTALL_DIR}
        PATH_SUFFIXES
        suitesparse
        ufsparse
        )

find_library(SPQR_LIBRARIES spqr $ENV{SPQRDIR} ${LIB_INSTALL_DIR})

if(SPQR_LIBRARIES)

    find_library(SUITESPARSE_LIBRARY SuiteSparse PATHS $ENV{SPQRDIR} ${LIB_INSTALL_DIR})
    if (SUITESPARSE_LIBRARY)
        set(SPQR_LIBRARIES ${SPQR_LIBRARIES} ${SUITESPARSE_LIBRARY})
    endif()

    find_library(CHOLMOD_LIBRARY cholmod PATHS $ENV{UMFPACK_LIBDIR} $ENV{UMFPACKDIR} ${LIB_INSTALL_DIR})
    if(CHOLMOD_LIBRARY)
        set(SPQR_LIBRARIES ${SPQR_LIBRARIES} ${CHOLMOD_LIBRARY})
    endif()

endif(SPQR_LIBRARIES)

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(SPQR DEFAULT_MSG SPQR_INCLUDES SPQR_LIBRARIES)

mark_as_advanced(SPQR_INCLUDES SPQR_LIBRARIES)