project(TargetLAPACK)

# <<<  "Build"  >>>

list(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/math)

set(MKL_COMPILER_BINDINGS "${CMAKE_CXX_COMPILER_ID}")
set(BLAS_LANG "CXX")
set(LAPACK_LANG "CXX")
if(NOT LAPACK_LIBRARIES)
    include(ConfigMath)
endif()

# <<  Build targets  >>
add_library(blas INTERFACE)
add_library(lapk INTERFACE)
add_library(lapack INTERFACE)
set_property(TARGET blas PROPERTY INTERFACE_LINK_LIBRARIES ${BLAS_LIBRARIES})
set_property(TARGET lapk PROPERTY INTERFACE_LINK_LIBRARIES ${LAPACK_LIBRARIES})
set_property(TARGET blas PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${BLAS_INCLUDE_DIRS})
set_property(TARGET lapk PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${LAPACK_INCLUDE_DIRS})
set_property(TARGET lapack PROPERTY INTERFACE_LINK_LIBRARIES lapk blas tgt::MathOpenMP)

# <<  Examine library list for MKL-ness  >>
foreach(_l IN LISTS LAPACK_LIBRARIES)
    get_filename_component(_lname ${_l} NAME)
    if(${_lname} MATCHES "mkl")
        set(isMKL " MKL")
        target_compile_definitions(lapack INTERFACE -DUSING_LAPACK_MKL)
        break()
    endif()
endforeach()

# <<  Detect OpenMP and modify for BLAS/LAPACK  >>
if(NOT TARGET tgt::MathOpenMP)
    list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR})
    set(TargetOpenMP_FIND_COMPONENTS "CXX")
    find_package(MathOpenMP)
endif()

#include(CMakePrintHelpers)
#cmake_print_properties(TARGETS OpenMP::OpenMP_CXX OpenMP::OpenMP tgt::MathOpenMP lapack
#                       PROPERTIES INTERFACE_COMPILE_DEFINITIONS INTERFACE_COMPILE_OPTIONS INTERFACE_INCLUDE_DIRS INTERFACE_LINK_LIBRARIES)

get_property(_ill TARGET lapk PROPERTY INTERFACE_LINK_LIBRARIES)
list(GET _ill 0 _ill0)
message(STATUS "${Cyan}Found LAPACK${isMKL}${ColourReset}: ${_ill0};...")

if(NOT (${isMKL} MATCHES "MKL"))
    message(WARNING "${Yellow}MKL is the only BLAS/LAPACK distribution thoroughly tested with Psi4. Several others are mostly fine, with problems cropping up in particular modules or when running in threaded mode. When using a non-MKL distribution, please run the test suite in full and also run particular tests in threaded mode, if you plan to run Psi4 threaded. MKL is freely available through conda; see instructions to compile against conda MKL through the 'source' option on the download website page.${ColourReset}")
endif()

unset(BLAS_LIBRARIES)
unset(LAPACK_LIBRARIES)
unset(BLAS_INCLUDE_DIRS)
unset(LAPACK_INCLUDE_DIRS)

set(PN ${PROJECT_NAME})
install(TARGETS blas lapk lapack
        EXPORT "${PN}Targets")

# <<<  Export Config  >>>

include(CMakePackageConfigHelpers)

set(CMAKECONFIG_INSTALL_DIR "share/cmake/${PN}")
configure_package_config_file(${PN}Config.cmake.in
                              "${CMAKE_CURRENT_BINARY_DIR}/${PN}Config.cmake"
                              INSTALL_DESTINATION ${CMAKECONFIG_INSTALL_DIR})
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PN}Config.cmake
              ${CMAKE_CURRENT_SOURCE_DIR}/FindTargetOpenMP.cmake
              ${CMAKE_CURRENT_SOURCE_DIR}/FindMathOpenMP.cmake
        DESTINATION ${CMAKECONFIG_INSTALL_DIR})
install(EXPORT "${PN}Targets"
        NAMESPACE "tgt::"
        DESTINATION ${CMAKECONFIG_INSTALL_DIR})

add_custom_target(lapack_external
    ${CMAKE_COMMAND} "-DCMAKE_INSTALL_PREFIX=${STAGED_INSTALL_PREFIX}" -P "${PROJECT_BINARY_DIR}/cmake_install.cmake"
    COMMENT "Installing Psi4-detected BLAS/LAPACK")

set(${PN}_DIR ${STAGED_INSTALL_PREFIX}/share/cmake/${PN} CACHE PATH "path to externally detected ${PN}Config.cmake" FORCE)
