# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

function(generate_unify_header DIR_NAME)
  set(options "")
  set(oneValueArgs HEADER_NAME SKIP_SUFFIX)
  set(multiValueArgs EXCLUDES)
  cmake_parse_arguments(generate_unify_header "${options}" "${oneValueArgs}"
                        "${multiValueArgs}" ${ARGN})

  # get header name and suffix
  set(header_name "${DIR_NAME}")
  list(LENGTH generate_unify_header_HEADER_NAME
       generate_unify_header_HEADER_NAME_len)
  if(${generate_unify_header_HEADER_NAME_len} GREATER 0)
    set(header_name "${generate_unify_header_HEADER_NAME}")
  endif()
  set(skip_suffix "")
  list(LENGTH generate_unify_header_SKIP_SUFFIX
       generate_unify_header_SKIP_SUFFIX_len)
  if(${generate_unify_header_SKIP_SUFFIX_len} GREATER 0)
    set(skip_suffix "${generate_unify_header_SKIP_SUFFIX}")
  endif()

  # exclude files
  list(LENGTH generate_unify_header_EXCLUDES generate_unify_header_EXCLUDES_len)

  # generate target header file
  set(header_file ${CMAKE_CURRENT_SOURCE_DIR}/include/${header_name}.h)
  file(
    WRITE ${header_file}
    "// Header file generated by paddle/phi/CMakeLists.txt for external users,\n// DO NOT edit or include it within paddle.\n\n#pragma once\n\n"
  )

  # get all top-level headers and write into header file
  file(GLOB HEADERS "${CMAKE_CURRENT_SOURCE_DIR}\/${DIR_NAME}\/*.h")
  foreach(header ${HEADERS})
    if(${generate_unify_header_EXCLUDES_len} GREATER 0)
      get_filename_component(header_file_name ${header} NAME)
      list(FIND generate_unify_header_EXCLUDES ${header_file_name} _index)
      if(NOT ${_index} EQUAL -1)
        continue()
      endif()
    endif()
    if("${skip_suffix}" STREQUAL "")
      string(REPLACE "${PADDLE_SOURCE_DIR}\/" "" header "${header}")
      file(APPEND ${header_file} "#include \"${header}\"\n")
    else()
      string(FIND "${header}" "${skip_suffix}.h" skip_suffix_found)
      if(${skip_suffix_found} EQUAL -1)
        string(REPLACE "${PADDLE_SOURCE_DIR}\/" "" header "${header}")
        file(APPEND ${header_file} "#include \"${header}\"\n")
      endif()
    endif()
  endforeach()
  # append header into extension.h
  string(REPLACE "${PADDLE_SOURCE_DIR}\/" "" header_file "${header_file}")
  file(APPEND ${phi_extension_header_file} "#include \"${header_file}\"\n")
endfunction()

# call kernel_declare need to make sure whether the target of input exists
function(kernel_declare TARGET_LIST)
  # message("TARGET LIST ${TARGET_LIST}")
  foreach(kernel_path ${TARGET_LIST})
    # message("kernel path ${kernel_path}" )
    file(READ ${kernel_path} kernel_impl)
    string(
      REGEX
        MATCH
        "(PD_REGISTER_KERNEL|PD_REGISTER_GENERAL_KERNEL)\\([ \t\r\n]*[a-z0-9_]*,[ \t\r\n\/]*[a-z0-9_]*"
        first_registry
        "${kernel_impl}")
    if(NOT first_registry STREQUAL "")
      # some gpu kernel only can run on cuda, not support rocm, so we add this branch
      if(WITH_ROCM)
        string(FIND "${first_registry}" "cuda_only" pos)
        if(pos GREATER 1)
          continue()
        endif()
      endif()
      # parse the first kernel name
      string(REPLACE "PD_REGISTER_KERNEL(" "" kernel_name "${first_registry}")
      string(REPLACE "PD_REGISTER_GENERAL_KERNEL(" "" kernel_name
                     "${kernel_name}")
      string(REPLACE "," "" kernel_name "${kernel_name}")
      string(REGEX REPLACE "[ \t\r\n]+" "" kernel_name "${kernel_name}")
      string(REGEX REPLACE "//cuda_only" "" kernel_name "${kernel_name}")
      # append kernel declare into declarations.h
      # TODO(chenweihang): default declare ALL_LAYOUT for each kernel
      if(${kernel_path} MATCHES "./cpu\/")
        file(APPEND ${kernel_declare_file}
             "PD_DECLARE_KERNEL(${kernel_name}, CPU, ALL_LAYOUT);\n")
      elseif(${kernel_path} MATCHES "./gpu\/")
        file(APPEND ${kernel_declare_file}
             "PD_DECLARE_KERNEL(${kernel_name}, GPU, ALL_LAYOUT);\n")
      elseif(${kernel_path} MATCHES "./xpu\/")
        file(APPEND ${kernel_declare_file}
             "PD_DECLARE_KERNEL(${kernel_name}, XPU, ALL_LAYOUT);\n")
      elseif(${kernel_path} MATCHES "./gpudnn\/")
        file(APPEND ${kernel_declare_file}
             "PD_DECLARE_KERNEL(${kernel_name}, GPUDNN, ALL_LAYOUT);\n")
      elseif(${kernel_path} MATCHES "./kps\/")
        file(APPEND ${kernel_declare_file}
             "PD_DECLARE_KERNEL(${kernel_name}, KPS, ALL_LAYOUT);\n")
      elseif(${kernel_path} MATCHES "./onednn\/")
        file(APPEND ${kernel_declare_file}
             "PD_DECLARE_KERNEL(${kernel_name}, OneDNN, ALL_LAYOUT);\n")
      else()
        # deal with device independent kernel, now we use CPU temporaary
        file(APPEND ${kernel_declare_file}
             "PD_DECLARE_KERNEL(${kernel_name}, CPU, ALL_LAYOUT);\n")
      endif()
    endif()
  endforeach()
endfunction()

function(append_op_util_declare TARGET)
  file(READ ${CMAKE_CURRENT_SOURCE_DIR}/${TARGET} target_content)
  string(
    REGEX
      MATCH
      "(PD_REGISTER_BASE_KERNEL_NAME|PD_REGISTER_ARG_MAPPING_FN)\\([ \t\r\n]*[a-z0-9_]*"
      util_registrar
      "${target_content}")
  string(REPLACE "PD_REGISTER_ARG_MAPPING_FN" "PD_DECLARE_ARG_MAPPING_FN"
                 util_declare "${util_registrar}")
  string(REPLACE "PD_REGISTER_BASE_KERNEL_NAME" "PD_DECLARE_BASE_KERNEL_NAME"
                 util_declare "${util_declare}")
  string(APPEND util_declare ");\n")
  file(APPEND ${op_utils_header} "${util_declare}")
endfunction()

function(register_op_utils TARGET_NAME)
  set(utils_srcs)
  set(options "")
  set(oneValueArgs "")
  set(multiValueArgs EXCLUDES DEPS)
  cmake_parse_arguments(register_op_utils "${options}" "${oneValueArgs}"
                        "${multiValueArgs}" ${ARGN})

  file(
    GLOB SIGNATURES
    RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}"
    "*_sig.cc")
  foreach(target ${SIGNATURES})
    append_op_util_declare(${target})
    list(APPEND utils_srcs ${CMAKE_CURRENT_SOURCE_DIR}/${target})
  endforeach()

  cc_library(
    ${TARGET_NAME}
    SRCS ${utils_srcs}
    DEPS ${register_op_utils_DEPS})
endfunction()