cmake_minimum_required(VERSION 3.15...3.28)

include(cmake/git.cmake)

project(P4EST
LANGUAGES C
HOMEPAGE_URL https://www.p4est.org/
DESCRIPTION "p4est manages a collection---a forest---of octrees in parallel."
VERSION ${PROJECT_VERSION})

enable_testing()

# --- user options

include(cmake/options.cmake)
message(STATUS "p4est ${PROJECT_VERSION} "
               "install prefix: ${CMAKE_INSTALL_PREFIX}")

# --- external libs

# Skip `libsc` if already registered. This is useful when `p4est` is added as a
# dependency by another software project which in turn already registered `libsc`.
if(NOT TARGET SC::SC)
  # Option to use an already installed SC library.
  if ( P4EST_USE_SYSTEM_SC )
      find_package( SC REQUIRED )
  else()
    include(cmake/GitSubmodule.cmake)
    git_submodule("${PROJECT_SOURCE_DIR}/sc")
    add_subdirectory(sc)
  endif()
endif()

# --- configure p4est

include(cmake/config.cmake)
include(cmake/compilers.cmake)

# --- p4est
# p4est is always needed.

add_library(p4est)
set_property(TARGET p4est PROPERTY EXPORT_NAME P4EST)
set_property(TARGET p4est PROPERTY SOVERSION ${P4EST_SOVERSION})
target_include_directories(p4est PUBLIC
  $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/src>
  $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/include>
  $<INSTALL_INTERFACE:include>)
target_link_libraries(p4est PUBLIC SC::SC )

if (WIN32)
  target_link_libraries(p4est PUBLIC ${WINSOCK_LIBRARIES})
endif()

# imported target, for use from parent projects
add_library(P4EST::P4EST INTERFACE IMPORTED GLOBAL)
target_link_libraries(P4EST::P4EST INTERFACE p4est)

install(DIRECTORY ${PROJECT_SOURCE_DIR}/src/ ${PROJECT_BINARY_DIR}/include/
  TYPE INCLUDE
  FILES_MATCHING PATTERN "*.h")

install(TARGETS p4est EXPORT ${PROJECT_NAME}-targets)

#--- p8est

if(P4EST_ENABLE_BUILD_3D)
  add_library(p8est OBJECT)
  target_include_directories(p8est PRIVATE src ${PROJECT_BINARY_DIR}/include)
  target_link_libraries(p8est PRIVATE SC::SC)
  target_sources(p4est PRIVATE $<TARGET_OBJECTS:p8est>)
endif()

#--- p6est

if(P4EST_ENABLE_BUILD_P6EST AND P4EST_ENABLE_BUILD_3D)
  add_library(p6est OBJECT)
  target_include_directories(p6est PRIVATE src ${PROJECT_BINARY_DIR}/include)
  target_link_libraries(p6est PRIVATE SC::SC)
  target_sources(p4est PRIVATE $<TARGET_OBJECTS:p6est>)
endif()

add_subdirectory(src)

# --- optional test and install

if(P4EST_BUILD_TESTING)
  add_subdirectory(test)
endif()

# --- packaging

include(cmake/pkgconf.cmake)
include(cmake/install.cmake)

# --- build examples
if(P4EST_BUILD_EXAMPLES AND CMAKE_VERSION VERSION_GREATER_EQUAL 3.22)
  add_subdirectory(example)
endif()

include(FeatureSummary)
add_feature_info(MPI P4EST_ENABLE_MPI "MPI features of ${PROJECT_NAME}")
add_feature_info(P6EST P4EST_ENABLE_BUILD_P6EST "2D-3D p6est")
add_feature_info(P8EST P4EST_ENABLE_BUILD_3D "3D p8est")
add_feature_info(shared BUILD_SHARED_LIBS "Build shared ${PROJECT_NAME} libraries")
feature_summary(WHAT ENABLED_FEATURES DISABLED_FEATURES)