cmake_minimum_required(VERSION 3.21) # since paraview 5.10
# The C is required to build with VTK when it has MPI
project(ttk VERSION 1.3.0 LANGUAGES CXX C)

if("${PROJECT_SOURCE_DIR}" STREQUAL "${PROJECT_BINARY_DIR}")
  message(FATAL_ERROR "Build in sources is not supported by TTK, please use a separate build folder")
endif()

include(CMakeDependentOption)

# options & dependencies
include(CMake/config.cmake)

# cmake packaging
include(CMake/cpack_config.cmake)

# Use folder as configured by the distribution
include(GNUInstallDirs)

# Base code
# ---------

include(CMake/CompilerFlags.cmake)
include(CMake/BaseCode.cmake)
add_library(baseAll INTERFACE)

add_subdirectory(core)

target_link_libraries(baseAll INTERFACE ${TTK_BASECODES})

install(
  TARGETS
    baseAll
  EXPORT
    TTKBaseTargets
  RUNTIME DESTINATION
    ${CMAKE_INSTALL_BINDIR}/ttk
  ARCHIVE DESTINATION
    ${CMAKE_INSTALL_LIBDIR}/ttk
  LIBRARY DESTINATION
    ${CMAKE_INSTALL_LIBDIR}/ttk
  )

install(
  EXPORT
    TTKBaseTargets
  NAMESPACE
    ttk::base::
  DESTINATION
    "${CMAKE_INSTALL_LIBDIR}/cmake/ttkBase"
  )

configure_file(core/base/TTKBaseConfig.cmake.in TTKBaseConfig.cmake @ONLY)
install(
  FILES
    "${CMAKE_CURRENT_BINARY_DIR}/TTKBaseConfig.cmake"
  DESTINATION
    "${CMAKE_INSTALL_LIBDIR}/cmake/ttkBase"
  )

# generate a TopologyToolKit.h header for the base layer
SET(TTK_HEADER "#pragma once\n\n")
LIST(APPEND TTK_HEADER "// This file has been generated by CMake\n\n")
foreach(module ${TTK_BASECODES})
  # get the header name from the module name (capitalize first letter)
  STRING(SUBSTRING ${module} 0 1 FIRST_LETTER)
  STRING(SUBSTRING ${module} 1 -1 STEM)
  STRING(TOUPPER ${FIRST_LETTER} FIRST_LETTER)
  STRING(CONCAT module ${FIRST_LETTER} ${STEM})
  # specific cases...
  if(${module} STREQUAL "Common")
    LIST(APPEND  TTK_HEADER "#include <CommandLineParser.h>\n")
  elseif(${module} STREQUAL "ContourAroundPoint")
    LIST(APPEND TTK_HEADER "#include <${module}.hpp>\n")
  elseif(${module} STREQUAL "FtmTree")
    LIST(APPEND TTK_HEADER "#include <FTMTree.h>\n")
  elseif(${module} STREQUAL "FtmTreePP")
    LIST(APPEND TTK_HEADER "#include <FTMTreePP.h>\n")
  elseif(${module} STREQUAL "FtrGraph")
    LIST(APPEND TTK_HEADER "#include <FTRGraph.h>\n")
  elseif(${module} STREQUAL "KdTree")
    LIST(APPEND TTK_HEADER "#include <KDTree.h>\n")
  elseif(${module} STREQUAL "Skeleton")
    continue()
  elseif(${module} STREQUAL "WebSocketIO")
    # avoid the public dependency to websocket++...
    continue()
  else()
    LIST(APPEND  TTK_HEADER "#include <${module}.h>\n")
  endif()
endforeach()
FILE(WRITE ${CMAKE_CURRENT_BINARY_DIR}/TopologyToolKit.h ${TTK_HEADER})
INSTALL(
  FILES ${CMAKE_CURRENT_BINARY_DIR}/TopologyToolKit.h
  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/ttk/base
  )


# Paraview plugin
# ---------------

set(VTKWRAPPER_DIR "${CMAKE_CURRENT_LIST_DIR}/core/vtk/")

# VTK Wrappers
# ------------

if(TTK_BUILD_VTK_WRAPPERS)
  include(CMake/VTKModule.cmake)
  add_library(ttkAll INTERFACE)

  add_subdirectory(core/vtk)

  target_link_libraries(ttkAll INTERFACE ${TTK_ENABLED_MODULES})
  add_dependencies(ttkAll baseAll)

  install(
    TARGETS
      ttkAll
    EXPORT
      TTKVTKTargets
    RUNTIME DESTINATION
      ${CMAKE_INSTALL_BINDIR}/ttk
    ARCHIVE DESTINATION
      ${CMAKE_INSTALL_LIBDIR}/ttk
    LIBRARY DESTINATION
      ${CMAKE_INSTALL_LIBDIR}/ttk
    )

  install(
    EXPORT
      TTKVTKTargets
    NAMESPACE
      ttk::vtk::
    DESTINATION
      ${CMAKE_INSTALL_LIBDIR}/cmake/ttkVTK
    )

  configure_file(core/vtk/TTKVTKConfig.cmake.in TTKVTKConfig.cmake @ONLY)
  install(
    FILES
      "${CMAKE_CURRENT_BINARY_DIR}/TTKVTKConfig.cmake"
    DESTINATION
      ${CMAKE_INSTALL_LIBDIR}/cmake/ttkVTK
    )
endif()

if(TTK_BUILD_PARAVIEW_PLUGINS)
  include(CMake/ParaViewFilter.cmake)
  add_compile_definitions("TTK_BUILD_PARAVIEW_PLUGINS")

  # Install location
  if(NOT "$ENV{PV_PLUGIN_PATH}" STREQUAL "")
    set(TTK_INSTALL_PLUGIN_DIR
        $ENV{PV_PLUGIN_PATH}
        CACHE
        PATH
        "Directory where the ParaView plugin will be installed"
        )
  else()
    set(TTK_INSTALL_PLUGIN_DIR
        "${CMAKE_INSTALL_BINDIR}/plugins"
        CACHE
        PATH
        "Directory where the ParaView plugin will be installed"
        )
  endif()

  # set rpath for the plugin
  set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_RPATH};${TTK_INSTALL_PLUGIN_DIR}/${TTK_PLUGIN_SUBDIR}")

  add_subdirectory(paraview)
endif()

# Standalones
# -----------

if(TTK_BUILD_STANDALONE_APPS)
  add_subdirectory(standalone)
endif()

# Status
# ------

include(CMake/Print.cmake)
ttk_print_summary()