cmake_minimum_required(VERSION 3.21)

project(dolfinx_nanobind)

if(WIN32)
  # Windows requires all symbols to be manually exported. This flag exports all
  # symbols automatically, as in Unix.
  set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS TRUE)
endif(WIN32)

find_package(
  Python
  COMPONENTS Interpreter Development
  REQUIRED
)

# Detect the installed nanobind package and import it into CMake
execute_process(
  COMMAND "${Python_EXECUTABLE}" -m nanobind --cmake_dir
  OUTPUT_STRIP_TRAILING_WHITESPACE
  OUTPUT_VARIABLE NB_DIR
)
list(APPEND CMAKE_PREFIX_PATH "${NB_DIR}")
find_package(nanobind CONFIG REQUIRED)

if ($ENV{PETSC_DIR} MATCHES ".*complex.*")
  set (BUILD_TYPE "complex")
else()
  set (BUILD_TYPE "real")
endif()
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/../debian/tmp-${BUILD_TYPE}/usr/lib/${CMAKE_LIBRARY_ARCHITECTURE}/cmake/dolfinx)

find_package(DOLFINX REQUIRED CONFIG)

if(DOLFINX_FOUND)
  message(STATUS "Found DOLFINx at ${DOLFINX_DIR}")
endif()

# Create the binding library nanobind handles its own calls to
# target_link_libraries
nanobind_add_module(
  cpp
  NOMINSIZE
  dolfinx/wrappers/dolfinx.cpp
  dolfinx/wrappers/assemble.cpp
  dolfinx/wrappers/common.cpp
  dolfinx/wrappers/fem.cpp
  dolfinx/wrappers/geometry.cpp
  dolfinx/wrappers/graph.cpp
  dolfinx/wrappers/io.cpp
  dolfinx/wrappers/la.cpp
  dolfinx/wrappers/log.cpp
  dolfinx/wrappers/mesh.cpp
  dolfinx/wrappers/petsc.cpp
  dolfinx/wrappers/refinement.cpp
)
target_compile_definitions(cpp PRIVATE cxx_std_20)

# Add DOLFINx libraries
target_link_libraries(cpp PRIVATE dolfinx)
# UUID requires bcrypt to be linked on Windows, broken in vcpkg.
# https://github.com/microsoft/vcpkg/issues/4481
if(WIN32)
  target_link_libraries(cpp PRIVATE bcrypt)
endif()

# Check for petsc4py
execute_process(
  COMMAND ${Python_EXECUTABLE} -c
          "import petsc4py; print(petsc4py.get_include())"
  OUTPUT_VARIABLE PETSC4PY_INCLUDE_DIR
  RESULT_VARIABLE PETSC4PY_COMMAND_RESULT
  ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
)

if(NOT PETSC4PY_COMMAND_RESULT)
  message(STATUS "Found petsc4py include directory at ${PETSC4PY_INCLUDE_DIR}")
  target_include_directories(cpp PRIVATE ${PETSC4PY_INCLUDE_DIR})
  target_compile_definitions(cpp PRIVATE HAS_PETSC4PY)
else()
  message(STATUS "petsc4py not found.")
endif()

# Check for mpi4py
execute_process(
  COMMAND "${Python_EXECUTABLE}" -c "import mpi4py; print(mpi4py.get_include())"
  OUTPUT_VARIABLE MPI4PY_INCLUDE_DIR
  RESULT_VARIABLE MPI4PY_COMMAND_RESULT
  ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE
)

if(NOT MPI4PY_COMMAND_RESULT)
  message(STATUS "Found mpi4py include directory at ${MPI4PY_INCLUDE_DIR}")
  target_include_directories(cpp PRIVATE ${MPI4PY_INCLUDE_DIR})
else()
  message(FATAL_ERROR "mpi4py could not be found.")
endif()

set_target_properties(cpp PROPERTIES INSTALL_RPATH_USE_LINK_PATH TRUE)

install(TARGETS cpp DESTINATION dolfinx)