#=============================================================================
# SPDX-FileCopyrightText: Copyright (c) 2022-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#=============================================================================

cmake_minimum_required(VERSION 3.26.4)

list(APPEND CMAKE_MESSAGE_CONTEXT "legate")

cmake_path(SET LEGATE_CMAKE_DIR NORMALIZE "${CMAKE_CURRENT_LIST_DIR}/cmake")

if(APPLE)
  include("${LEGATE_CMAKE_DIR}/Modules/setup_macos_sdk_environ.cmake")

  legate_setup_macos_sdk_environ()
endif()

if(SKBUILD)
  set(legate_project_suffix python)
else()
  set(legate_project_suffix cpp)
endif()

file(READ "${CMAKE_CURRENT_SOURCE_DIR}/../VERSION" LEGATE_VERSION)
string(STRIP "${LEGATE_VERSION}" LEGATE_VERSION)

project(legate_${legate_project_suffix}
        VERSION ${LEGATE_VERSION}
        LANGUAGES CXX
        DESCRIPTION "Multi-node, Multi-GPU Parallel Runtime Library"
        HOMEPAGE_URL https://docs.nvidia.com/legate/latest/)

# ########################################################################################
# * Compiler Version Checks --------------------------------------------------------

if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
  if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "10.0")
    message(FATAL_ERROR "GCC version ${CMAKE_CXX_COMPILER_VERSION} is not supported. Minimum required version is 10.0. Please upgrade your compiler."
    )
  endif()
else()
  message(STATUS "Using ${CMAKE_CXX_COMPILER_ID} ${CMAKE_CXX_COMPILER_VERSION} - "
                 "compiler support not explicitly validated")
endif()

# ########################################################################################
# * Common Core --------------------------------------------------------

option(AEDIFIX "Whether this configuration is being driven by aedifix" OFF)

# ########################################################################################
# * Setup LEGATE_DIR and LEGATE_ARCH

if(NOT DEFINED LEGATE_DIR)
  # this one we can figure out on our own
  set(LEGATE_DIR "${CMAKE_CURRENT_LIST_DIR}/..")
endif()

cmake_path(SET LEGATE_DIR NORMALIZE "${LEGATE_DIR}")

set(LEGATE_DIR
    "${LEGATE_DIR}"
    CACHE PATH
          "Path to root legate source directory (not to be confused with legate_DIR which points to the root install directory)"
          FORCE)

if(NOT DEFINED LEGATE_ARCH)
  set(bin_dir ${CMAKE_CURRENT_BINARY_DIR})
  if(AEDIFIX)
    # We are being driven by Aedifix, that must mean our current binary path is
    # $LEGATE_DIR/<arch-name>/cmake_build. That being said, this path should never be
    # exercised, because aedifix should be setting this value for us!
    if(NOT "${bin_dir}" MATCHES "cmake_build$")
      message(FATAL_ERROR "Could not locate LEGATE_ARCH directory, expected binary dir to end "
                          "with 'cmake_build', but it is ${bin_dir}. Expected this directory structure "
                          "because environment variable: AEDIFIX=1. Likely this indicates this environment "
                          "variable is wrongly set.")
    endif()
    cmake_path(GET bin_dir PARENT_PATH bin_dir)
  endif()
  cmake_path(GET bin_dir STEM LEGATE_ARCH)
  unset(bin_dir)
endif()

# push it to cache
set(LEGATE_ARCH "${LEGATE_ARCH}" CACHE STRING "Name of the legate arch directory" FORCE)

cmake_path(SET LEGATE_ARCH_DIR NORMALIZE "${LEGATE_DIR}/${LEGATE_ARCH}")

# ########################################################################################
# * C++ and CUDA standard ----------------------------------------------------

function(legate_set_language_standard LANG DEFAULT)
  if(NOT CMAKE_${LANG}_STANDARD)
    set(CMAKE_${LANG}_STANDARD ${DEFAULT})
  endif()

  if(NOT "${CMAKE_${LANG}_STANDARD}" STREQUAL "${DEFAULT}")
    message(WARNING "CMAKE_${LANG}_STANDARD set to ${CMAKE_${LANG}_STANDARD}. "
                    "Legate expects to be compiled with C++${DEFAULT}")
  endif()

  set(CMAKE_${LANG}_STANDARD ${CMAKE_${LANG}_STANDARD} PARENT_SCOPE)
  set(CMAKE_${LANG}_STANDARD_REQUIRED ON PARENT_SCOPE)
endfunction()

legate_set_language_standard(CXX 17)
legate_set_language_standard(CUDA 17)

# Tells cmake to re-run configure if any of these files have changed. This is needed
# because these are all static files (i.e. not generated by some target), and cmake
# provides no easy way to create a target for static resources.
set_property(DIRECTORY
             APPEND
             PROPERTY CMAKE_CONFIGURE_DEPENDS
                      "${LEGATE_CMAKE_DIR}/versions/versions.json"
                      "${LEGATE_CMAKE_DIR}/versions/legion_version.json"
                      "${LEGATE_CMAKE_DIR}/templates/uninstall.cmake.in"
                      "${LEGATE_CMAKE_DIR}/templates/legate_defines.h.in"
                      "${LEGATE_CMAKE_DIR}/templates/bin2c.cc.in"
                      "${LEGATE_CMAKE_DIR}/templates/bin2c.h.in"
                      "${LEGATE_CMAKE_DIR}/templates/git_version.cc.in"
                      "${LEGATE_CMAKE_DIR}/templates/install_info.py.in")

macro(set_ifndef variable value)
  if(NOT DEFINED ${variable})
    set(${variable} ${value})
  endif()
endmacro()

macro(set_parent_scope variable)
  set(${variable} ${${variable}} PARENT_SCOPE)
endmacro()

option(BUILD_MARCH "Target a specific CPU architecture" OFF)
option(BUILD_MCPU "Tune for a specific CPU architecture" OFF)
option(CMAKE_EXPORT_COMPILE_COMMANDS "Export CMake compile commands" ON)
option(CMAKE_POSITION_INDEPENDENT_CODE "Build position independent code" ON)
option(BUILD_SHARED_LIBS "Build shared libraries" ON)

# ########################################################################################
# * rapids-cmake --------------------------------------------------------

include("${LEGATE_CMAKE_DIR}/Modules/include_rapids.cmake")

legate_include_rapids()

include(rapids-cmake)
include(rapids-cpm)
include(rapids-cuda)
include(rapids-export)
include(rapids-find)
include(rapids-version)

rapids_cmake_build_type(Release)

# ########################################################################################
# * conda environment --------------------------------------------------------

include(GNUInstallDirs)

rapids_cmake_support_conda_env(conda_env MODIFY_PREFIX_PATH)
# We're building python extension libraries, which must always be installed under lib/,
# even if the system normally uses lib64/. Rapids-cmake currently doesn't realize this
# when we're going through scikit-build, see
# https://github.com/rapidsai/rapids-cmake/issues/426 Do this before we include Legion, so
# its build also inherits this setting.
if(TARGET conda_env)
  set(CMAKE_INSTALL_LIBDIR "lib")
else()
  rapids_cmake_install_lib_dir(CMAKE_INSTALL_LIBDIR)
endif()

if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
  set(legate_PLATFORM_RPATH_ORIGIN "\$ORIGIN")
elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
  set(legate_PLATFORM_RPATH_ORIGIN "@loader_path")
else()
  message(FATAL_ERROR "Unsupported system: ${CMAKE_SYSTEM_NAME}, don't know how to set "
                      "rpath 'origin' on this platform")
endif()

cmake_path(SET legate_DEP_INSTALL_LIBDIR NORMALIZE "${CMAKE_INSTALL_LIBDIR}/legate/deps")
cmake_path(SET legate_DEP_INSTALL_INCLUDEDIR NORMALIZE
           "${CMAKE_INSTALL_INCLUDEDIR}/legate/deps")
cmake_path(SET legate_DEP_INSTALL_BINDIR NORMALIZE
           "${CMAKE_INSTALL_DATAROOTDIR}/legate/${CMAKE_INSTALL_BINDIR}")

add_subdirectory(${legate_project_suffix})