# Copyright (c) Meta Platforms, Inc. and its affiliates.
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.

set(DEPS_DIR "${CMAKE_CURRENT_LIST_DIR}/../deps")
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_LIST_DIR}")

# Find Corrade first so we can use CORRADE_TARGET_*
if(NOT USE_SYSTEM_MAGNUM)
  # These are enabled by default but we don't need them right now -- disabling
  # for slightly faster builds. If you need any of these, simply delete a line.
  set(CORRADE_WITH_INTERCONNECT OFF CACHE BOOL "" FORCE)
  # Ensure Corrade should be built statically if Magnum is.
  set(CORRADE_BUILD_PLUGINS_STATIC ON CACHE BOOL "" FORCE)
  set(CORRADE_BUILD_STATIC ON CACHE BOOL "" FORCE)
  set(CORRADE_BUILD_STATIC_PIC ON CACHE BOOL "" FORCE)
  add_subdirectory("${DEPS_DIR}/corrade")
endif()
find_package(Corrade REQUIRED Utility)

# OpenMP
find_package(OpenMP)
# We don't find_package(OpenGL REQUIRED) here, but let Magnum do that instead
# as it sets up various things related to GLVND.

include_directories(SYSTEM "deps")

# Eigen. Use a system package, if preferred.
if(USE_SYSTEM_EIGEN)
  find_package(Eigen3 REQUIRED)
  include_directories(SYSTEM ${EIGEN3_INCLUDE_DIR})
else()
  include_directories(SYSTEM "${DEPS_DIR}/eigen")
  set(EIGEN3_INCLUDE_DIR "${DEPS_DIR}/eigen")
  set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${DEPS_DIR}/eigen/cmake")
endif()

# Zstd, needed by BasisImporter. Let it find a system package on its own, if
# preferred.
if(NOT USE_SYSTEM_ZSTD)
  set(ZSTD_BUILD_PROGRAMS OFF CACHE BOOL "" FORCE)
  # Create a static library so the plugin is self-contained
  set(ZSTD_BUILD_SHARED OFF CACHE BOOL "" FORCE)
  set(ZSTD_BUILD_STATIC ON CACHE BOOL "" FORCE)
  # Basis doesn't use any multithreading in zstd, this prevents a need to link
  # to pthread on Linux
  set(ZSTD_MULTITHREAD_SUPPORT OFF CACHE BOOL "" FORCE)
  # Don't build Zstd tests if enable_testing() was called in parent project
  set(ZSTD_BUILD_TESTS OFF CACHE BOOL "" FORCE)
  add_subdirectory("${DEPS_DIR}/zstd/build/cmake" EXCLUDE_FROM_ALL)
endif()

# tinyxml2
include_directories(SYSTEM "${DEPS_DIR}/tinyxml2")
add_subdirectory("${DEPS_DIR}/tinyxml2")

# RapidJSON. Use a system package, if preferred.
if(USE_SYSTEM_RAPIDJSON)
  find_package(RapidJSON CONFIG REQUIRED)
  include_directories(SYSTEM ${RapidJSON_INCLUDE_DIR})
else()
  include_directories(SYSTEM "${DEPS_DIR}/rapidjson/include")
endif()

# Why all the weird options in the set() calls below?
# See https://stackoverflow.com/questions/3766740/overriding-a-default-option-value-in-cmake-from-a-parent-cmakelists-txt

# Assimp. Use a system package, if preferred.
if(BUILD_ASSIMP_SUPPORT AND NOT USE_SYSTEM_ASSIMP)
  set(ASSIMP_BUILD_ASSIMP_TOOLS OFF CACHE BOOL "ASSIMP_BUILD_ASSIMP_TOOLS" FORCE)
  set(ASSIMP_BUILD_TESTS OFF CACHE BOOL "ASSIMP_BUILD_TESTS" FORCE)
  set(ASSIMP_NO_EXPORT ON CACHE BOOL "" FORCE)
  set(BUILD_SHARED_LIBS OFF CACHE BOOL "BUILD_SHARED_LIBS" FORCE)
  # The following is important to avoid Assimp appending `d` to all our
  # binaries. Works only with Assimp >= 5.0.0, and after 5.0.1 this option is
  # prefixed with ASSIMP_, so better set both variants to future-proof this.
  set(INJECT_DEBUG_POSTFIX OFF CACHE BOOL "" FORCE)
  set(ASSIMP_INJECT_DEBUG_POSTFIX OFF CACHE BOOL "" FORCE)
  # Otherwise Assimp may attempt to find minizip on the filesystem using
  # pkgconfig, but in a poor way that expects just yelling -lminizip at the
  # linker without any link directories would work. It won't. (The variable
  # is not an option() so no need to CACHE it.)
  set(ASSIMP_BUILD_MINIZIP ON)
  add_subdirectory("${DEPS_DIR}/assimp")
endif()

# audio
if(BUILD_WITH_AUDIO)
  find_library(
    RLRAudioPropagation_LIBRARY RLRAudioPropagation
    PATHS ${DEPS_DIR}/rlr-audio-propagation/RLRAudioPropagationPkg/libs/linux/x64
  )
endif()

# recast
set(RECASTNAVIGATION_DEMO OFF CACHE BOOL "RECASTNAVIGATION_DEMO" FORCE)
set(RECASTNAVIGATION_TESTS OFF CACHE BOOL "RECASTNAVIGATION_TESTS" FORCE)
set(RECASTNAVIGATION_EXAMPLES OFF CACHE BOOL "RECASTNAVIGATION_EXAMPLES" FORCE)
# Temp BUILD_SHARED_LIBS override for Recast, has to be reset back after to avoid affecting Bullet (which needs shared) and potentially other submodules
set(_PREV_BUILD_SHARED_LIBS ${BUILD_SHARED_LIBS})
set(BUILD_SHARED_LIBS OFF)
include(GNUInstallDirs)
add_subdirectory("${DEPS_DIR}/recastnavigation/Recast")
add_subdirectory("${DEPS_DIR}/recastnavigation/Detour")
set(BUILD_SHARED_LIBS ${_PREV_BUILD_SHARED_LIBS})
# Needed so that Detour doesn't hide the implementation of the method on dtQueryFilter
target_compile_definitions(Detour PUBLIC DT_VIRTUAL_QUERYFILTER)

if(BUILD_PYTHON_BINDINGS)
  # Before calling find_package(PythonInterp) search for python executable not
  # in the default paths to pick up activated virtualenv/conda python
  find_program(
    PYTHON_EXECUTABLE
    # macOS still defaults to `python` being Python 2, so look for `python3`
    # first
    NAMES python3 python
    PATHS ENV PATH # look in the PATH environment variable
    NO_DEFAULT_PATH # do not look anywhere else...
  )

  # Let the Find module do proper version checks on what we found (it uses the
  # same PYTHON_EXECUTABLE variable, will pick it up from the cache)
  find_package(PythonInterp 3.9 REQUIRED)

  message(STATUS "Bindings being generated for python at ${PYTHON_EXECUTABLE}")

  # Pybind11. Use a system package, if preferred. This needs to be before Magnum
  # so the bindings can properly detect pybind11 added as a subproject.
  if(USE_SYSTEM_PYBIND11)
    find_package(pybind11 REQUIRED)
  else()
    add_subdirectory("${DEPS_DIR}/pybind11")
  endif()
endif()

if(BUILD_WITH_BULLET AND NOT USE_SYSTEM_BULLET)
  # The below block except for the visibility patch verbatim copied from
  # https://doc.magnum.graphics/magnum/namespaceMagnum_1_1BulletIntegration.html

  # Disable Bullet tests and demos
  set(BUILD_UNIT_TESTS OFF CACHE BOOL "" FORCE)
  set(BUILD_BULLET2_DEMOS OFF CACHE BOOL "" FORCE)
  set(BUILD_CPU_DEMOS OFF CACHE BOOL "" FORCE)
  set(BUILD_OPENGL3_DEMOS OFF CACHE BOOL "" FORCE)
  # While not needed for Magnum, you might actually want some of those
  set(BUILD_ENET OFF CACHE BOOL "" FORCE)
  set(BUILD_CLSOCKET OFF CACHE BOOL "" FORCE)
  set(BUILD_EXTRAS OFF CACHE BOOL "" FORCE)
  set(BUILD_BULLET3 OFF CACHE BOOL "" FORCE)
  # This is needed in case BUILD_EXTRAS is enabled, as you'd get a CMake syntax
  # error otherwise
  set(PKGCONFIG_INSTALL_PREFIX "lib${LIB_SUFFIX}/pkgconfig/")

  # caches CXX_FLAGS so we can reset them at the end
  set(_PREV_CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})

  # Bullet's buildsystem doesn't correctly express dependencies between static
  # libs, causing linker errors on Magnum side. If you have CMake 3.13, the
  # Find module is able to correct that on its own, otherwise you need to
  # enable BUILD_SHARED_LIBS to build as shared.
  if(CMAKE_VERSION VERSION_LESS 3.13)
    set(BUILD_SHARED_LIBS ON CACHE BOOL "" FORCE)
    # however the whole Habitat is built with -fvisibility=hidden and Bullet
    # doesn't export any of its symbols and relies on symbols being visible by
    # default. Which means we have to compile it without hidden visibility.
    # ... and because we have to build shared libs, we need exported symbols,
    string(REPLACE "-fvisibility=hidden" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
  else()
    # On Emscripten we require 3.13, so there it's fine (and there we can't use
    # shared libs)
    set(BUILD_SHARED_LIBS OFF CACHE BOOL "" FORCE)
  endif()
  ## Bullet Optimization Bug
  # We need to define this macro for bullet to bypass an early-out optimization that
  # was added to bullet via this PR https://github.com/bulletphysics/bullet3/pull/4190 ,
  # specifically here :
  #      https://github.com/erwincoumans/bullet3/blob/28b951c128b53e1dcf26271dd47b88776148a940/src/BulletCollision/CollisionDispatch/btConvexConcaveCollisionAlgorithm.cpp#L106
  # that causes rigid objects to never come to rest.
  # This needs to be further examined on bullet side
  add_definitions(-DBT_DISABLE_CONVEX_CONCAVE_EARLY_OUT=1)
  add_subdirectory(${DEPS_DIR}/bullet3 EXCLUDE_FROM_ALL)
  set(CMAKE_CXX_FLAGS ${_PREV_CMAKE_CXX_FLAGS})
endif()

# Magnum. Use a system package, if preferred.
if(NOT USE_SYSTEM_MAGNUM)
  set(MAGNUM_BUILD_PLUGINS_STATIC ON CACHE BOOL "" FORCE)
  set(MAGNUM_BUILD_STATIC ON CACHE BOOL "" FORCE)
  set(MAGNUM_BUILD_STATIC_PIC ON CACHE BOOL "" FORCE)
  # Always use EGL on platforms that support it. This means both windowless and
  # windowed applications will use it. If you are experiencing driver issues or
  # are on an older system where EGL doesn't really work yet, you might want to
  # set MAGNUM_TARGET_EGL back to OFF below.
  if(NOT CORRADE_TARGET_APPLE AND NOT CORRADE_TARGET_WINDOWS)
    set(MAGNUM_TARGET_EGL ON CACHE BOOL "" FORCE)
  endif()

  # These are enabled by default but we don't need them for anything yet
  set(MAGNUM_WITH_SHADERTOOLS OFF CACHE BOOL "" FORCE)
  # These used to be disabled here but now aren't, explicitly enable them to
  # update options in existing builds
  set(MAGNUM_WITH_MATERIALTOOLS ON CACHE BOOL "" FORCE)

  # These are enabled by default but we don't need them if not building GUI
  # viewers -- disabling for slightly faster builds. If you need any of these
  # always, simply delete a line.
  set(MAGNUM_WITH_TEXT OFF CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_TEXTURETOOLS OFF CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_STBTRUETYPEFONT OFF CACHE BOOL "" FORCE)

  # These are not enabled by default but we need them
  set(MAGNUM_WITH_ANYSCENEIMPORTER ON CACHE BOOL "" FORCE)
  if(BUILD_ASSIMP_SUPPORT)
    set(MAGNUM_WITH_ASSIMPIMPORTER ON CACHE BOOL "" FORCE)
  endif()
  set(MAGNUM_WITH_GLTFIMPORTER ON CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_UFBXIMPORTER ON CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_ANYIMAGEIMPORTER ON CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_ANYIMAGECONVERTER ON CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_KTXIMPORTER ON CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_PRIMITIVEIMPORTER ON CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_STANFORDIMPORTER ON CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_STBIMAGEIMPORTER ON CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_STBIMAGECONVERTER ON CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_EMSCRIPTENAPPLICATION OFF CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_GLFWAPPLICATION OFF CACHE BOOL "" FORCE)
  set(MAGNUM_WITH_EIGEN ON CACHE BOOL "" FORCE) # Eigen integration
  # GltfSceneConverter and KtxImageConverter are needed only by
  # BatchRendererTest and are optional
  #set(MAGNUM_WITH_GLTFSCENECONVERTER ON CACHE BOOL "" FORCE)
  #set(MAGNUM_WITH_KTXIMAGECONVERTER ON CACHE BOOL "" FORCE)
  if(BUILD_PYTHON_BINDINGS)
    set(MAGNUM_WITH_PYTHON ON CACHE BOOL "" FORCE) # Python bindings
  endif()
  if(BUILD_TEST)
    set(MAGNUM_WITH_OPENGLTESTER ON CACHE BOOL "" FORCE)
  endif()

  # Basis Universal. The repo is extremely huge and so instead of a Git
  # submodule we bundle just the transcoder files, and only a subset of the
  # formats (BC7 mode 6 has > 1 MB tables, ATC/FXT1/PVRTC2 are quite rare and
  # not supported by Magnum).
  set(BASIS_UNIVERSAL_DIR "${DEPS_DIR}/basis-universal")
  set(
    CMAKE_CXX_FLAGS
    "${CMAKE_CXX_FLAGS} -DBASISD_SUPPORT_BC7_MODE6_OPAQUE_ONLY=0 -DBASISD_SUPPORT_ATC=0 -DBASISD_SUPPORT_FXT1=0 -DBASISD_SUPPORT_PVRTC2=0"
  )
  set(MAGNUM_WITH_BASISIMPORTER ON CACHE BOOL "" FORCE)

  if(BUILD_BASIS_COMPRESSOR)
    # ImageConverter tool for basis
    set(MAGNUM_WITH_IMAGECONVERTER ON CACHE BOOL "" FORCE)
    set(MAGNUM_WITH_BASISIMAGECONVERTER ON CACHE BOOL "" FORCE)
  endif()

  # OpenEXR. Use a system package, if preferred.
  if(NOT USE_SYSTEM_OPENEXR)
    # Disable unneeded functionality
    set(PYILMBASE_ENABLE OFF CACHE BOOL "" FORCE)
    set(IMATH_INSTALL_PKG_CONFIG OFF CACHE BOOL "" FORCE)
    set(IMATH_INSTALL_SYM_LINK OFF CACHE BOOL "" FORCE)
    set(OPENEXR_INSTALL OFF CACHE BOOL "" FORCE)
    set(OPENEXR_INSTALL_DOCS OFF CACHE BOOL "" FORCE)
    set(OPENEXR_INSTALL_EXAMPLES OFF CACHE BOOL "" FORCE)
    set(OPENEXR_INSTALL_PKG_CONFIG OFF CACHE BOOL "" FORCE)
    set(OPENEXR_INSTALL_TOOLS OFF CACHE BOOL "" FORCE)
    set(OPENEXR_BUILD_UTILS OFF CACHE BOOL "" FORCE)
    # Otherwise OpenEXR uses C++14, and before OpenEXR 3.0.2 also forces C++14
    # on all libraries that link to it.
    set(OPENEXR_CXX_STANDARD 11 CACHE STRING "" FORCE)
    # OpenEXR implicitly bundles Imath. However, without this only the first
    # CMake run will pass and subsequent runs will fail.
    set(CMAKE_DISABLE_FIND_PACKAGE_Imath ON)
    # These variables may be used by other projects, so ensure they're reset
    # back to their original values after. OpenEXR forces CMAKE_DEBUG_POSTFIX
    # to _d, which isn't desired outside of that library.
    set(_PREV_BUILD_SHARED_LIBS ${BUILD_SHARED_LIBS})
    set(_PREV_BUILD_TESTING ${BUILD_TESTING})
    set(BUILD_SHARED_LIBS OFF)
    set(BUILD_TESTING OFF)
    set(CMAKE_DEBUG_POSTFIX "" CACHE STRING "" FORCE)
    add_subdirectory("${DEPS_DIR}/openexr" EXCLUDE_FROM_ALL)
    set(BUILD_SHARED_LIBS ${_PREV_BUILD_SHARED_LIBS})
    set(BUILD_TESTING ${_PREV_BUILD_TESTING})
    unset(CMAKE_DEBUG_POSTFIX CACHE)

    set(MAGNUM_WITH_OPENEXRIMPORTER ON CACHE BOOL "" FORCE)
    set(MAGNUM_WITH_OPENEXRIMAGECONVERTER ON CACHE BOOL "" FORCE)
  endif()

  if(BUILD_WITH_BULLET)
    # Build Magnum's BulletIntegration
    set(MAGNUM_WITH_BULLET ON CACHE BOOL "" FORCE)
  else()
    set(MAGNUM_WITH_BULLET OFF CACHE BOOL "" FORCE)
  endif()

  if(BUILD_GUI_VIEWERS)
    set(MAGNUM_WITH_TEXT ON CACHE BOOL "" FORCE)
    set(MAGNUM_WITH_STBTRUETYPEFONT ON CACHE BOOL "" FORCE)
    if(NOT USE_SYSTEM_GLFW)
      set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
      # These two will be off-by-default when GLFW 3.4 gets released
      set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
      set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
      add_subdirectory("${DEPS_DIR}/glfw")
    endif()
    set(MAGNUM_WITH_GLFWAPPLICATION ON CACHE BOOL "" FORCE)
  endif()
  if(MAGNUM_TARGET_EGL) # Includes also Emscripten
    set(MAGNUM_WITH_WINDOWLESSEGLAPPLICATION ON CACHE BOOL "" FORCE)
  else()
    # Disable again to avoid more than one Windowless*Application being
    # enabled, which makes linking to the Magnum::WindowlessApplication alias
    # pick one of them arbitrarily.
    set(MAGNUM_WITH_WINDOWLESSEGLAPPLICATION OFF CACHE BOOL "" FORCE)
    if(CORRADE_TARGET_APPLE)
      set(MAGNUM_WITH_WINDOWLESSCGLAPPLICATION ON CACHE BOOL "" FORCE)
    elseif(CORRADE_TARGET_UNIX)
      # Just for cases when EGL wouldn't work
      set(MAGNUM_WITH_WINDOWLESSGLXAPPLICATION ON CACHE BOOL "" FORCE)
    elseif(CORRADE_TARGET_WINDOWS)
      set(MAGNUM_WITH_WINDOWLESSWGLAPPLICATION ON CACHE BOOL "" FORCE)
    else()
      message(FATAL_ERROR "Unsupported platform")
    endif()
  endif()
  add_subdirectory("${DEPS_DIR}/magnum")
  add_subdirectory("${DEPS_DIR}/magnum-plugins")
  add_subdirectory("${DEPS_DIR}/magnum-integration")
  if(BUILD_PYTHON_BINDINGS)
    # Make Magnum text rendering plugins (used by the native viewer) available
    # for Python as well; and reset that back to strange build procedures that
    # turn some features off again later can still work.
    set(
      common_plugins
      Magnum::AnyImageConverter
      Magnum::AnyImageImporter
      Magnum::AnySceneImporter
      MagnumPlugins::AssimpImporter
      MagnumPlugins::BasisImporter
      MagnumPlugins::GltfImporter
      MagnumPlugins::StbImageConverter
      MagnumPlugins::StbImageImporter
    )
    if(BUILD_GUI_VIEWERS)
      set(MAGNUM_PYTHON_BINDINGS_STATIC_PLUGINS ${common_plugins}
                                                MagnumPlugins::StbTrueTypeFont
          CACHE STRING "" FORCE
      )
    else()
      set(MAGNUM_PYTHON_BINDINGS_STATIC_PLUGINS ${common_plugins} CACHE STRING "" FORCE)
    endif()
    add_subdirectory("${DEPS_DIR}/magnum-bindings")
  endif()

endif()

add_library(
  atomic_wait STATIC
  ${DEPS_DIR}/atomic_wait/atomic_wait.cpp
)
target_include_directories(atomic_wait PUBLIC ${DEPS_DIR}/atomic_wait)