# ##############################################################################
# cmake/nuttx_add_application.cmake
#
# SPDX-License-Identifier: Apache-2.0
#
# Licensed to the Apache Software Foundation (ASF) under one or more contributor
# license agreements.  See the NOTICE file distributed with this work for
# additional information regarding copyright ownership.  The ASF licenses this
# file to you 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.
#
# ##############################################################################

include(nuttx_parse_function_args)

define_property(
  GLOBAL
  PROPERTY NUTTX_APPS_LIBRARIES
  BRIEF_DOCS "NuttX application libs"
  FULL_DOCS "List of all NuttX application libraries")

# ~~~
# nuttx_add_application
#
# Description:
#   Declares a NuttX application as a static library. The corresponding target
#   will be named apps_<NAME>. The first entry into the source list is assumed
#   to be the one containing main() and will thus receive a -Dmain=app_main
#   definition during build.
#
# Usage:
#   nuttx_add_application( NAME <string> [ PRIORITY <string> ]
#     [ STACKSIZE <string> ] [ COMPILE_FLAGS <list> ]
#     [ INCLUDE_DIRECTORIES <list> ] [ DEPENDS <string> ]
#     [ DEFINITIONS <string> ] [ MODULE <string> ] [ SRCS <list> ] )
#
# Parameters:
#   NAME                : unique name of application
#   PRIORITY            : priority
#   STACKSIZE           : stack size
#   COMPILE_FLAGS       : compile flags
#   INCLUDE_DIRECTORIES : include directories
#   DEPENDS             : targets which this module depends on
#   DEFINITIONS         : optional compile definitions
#   MODULE              : if "m", build module (designed to received
#                         CONFIG_<app> value)
#   SRCS                : source files
#   NO_MAIN_ALIAS       : do not add a main=<app>_main alias(*)
#
# (*) This is only really needed in convoluted cases where a single .c file
# contains differently named <app>_main() entries for different <app>. This
# situation should really be changed into a separate main file per actual app
# using a shared user library.
#
# Example:
#   nuttx_add_application(
#     NAME test
#     SRCS file.cpp
#     STACKSIZE 1024
#     DEPENDS nshlib
#     MODULE ${CONFIG_EXAMPLES_TEST})
# ~~~

function(nuttx_add_application)

  # parse arguments into variables

  nuttx_parse_function_args(
    FUNC
    nuttx_add_application
    ONE_VALUE
    NAME
    PRIORITY
    STACKSIZE
    MODULE
    MULTI_VALUE
    COMPILE_FLAGS
    INCLUDE_DIRECTORIES
    SRCS
    DEPENDS
    DEFINITIONS
    OPTIONS
    NO_MAIN_ALIAS
    REQUIRED
    NAME
    ARGN
    ${ARGN})

  # create target

  if(SRCS)
    if(MODULE
       AND ("${MODULE}" STREQUAL "m")
       OR CONFIG_BUILD_KERNEL)
      # create as standalone executable (loadable application or "module")
      set(TARGET "${NAME}")

      # Use ELF capable toolchain, by building manually and overwriting the
      # non-elf output
      if(NOT CMAKE_C_ELF_COMPILER)
        add_library(${TARGET} ${SRCS})

        add_custom_command(
          TARGET ${TARGET}
          POST_BUILD
          COMMAND
            ${CMAKE_C_COMPILER}
            $<GENEX_EVAL:$<TARGET_PROPERTY:nuttx,NUTTX_ELF_APP_LINK_OPTIONS>>
            $<TARGET_FILE:${TARGET}> -o ${TARGET}
          COMMAND_EXPAND_LISTS)
      else()
        add_executable(${TARGET} ${SRCS})
        target_link_options(
          ${TARGET} PRIVATE
          $<GENEX_EVAL:$<TARGET_PROPERTY:nuttx,NUTTX_ELF_APP_LINK_OPTIONS>>)
      endif()

      # easy access to final ELF, regardless of how it was created
      set_property(TARGET ${TARGET}
                   PROPERTY ELF_BINARY ${CMAKE_CURRENT_BINARY_DIR}/${TARGET})

      nuttx_add_library_internal(${TARGET})

      install(TARGETS ${TARGET})
      set_property(
        TARGET nuttx
        APPEND
        PROPERTY NUTTX_LOADABLE_APPS ${TARGET})
    else()
      # create as library to be archived into libapps.a
      set(TARGET "apps_${NAME}")
      add_library(${TARGET} ${SRCS})

      nuttx_add_library_internal(${TARGET})
      # add to list of application libraries

      set_property(GLOBAL APPEND PROPERTY NUTTX_APPS_LIBRARIES ${TARGET})

      if(NOT NO_MAIN_ALIAS)
        # provide main() alias
        list(GET SRCS 0 MAIN_SRC)
        set_property(
          SOURCE ${MAIN_SRC}
          APPEND
          PROPERTY COMPILE_DEFINITIONS main=${NAME}_main)
      endif()
    endif()

    # loadable build requires applying ELF flags to all applications

    if(CONFIG_MODULES)
      target_compile_options(
        ${TARGET}
        PRIVATE
          $<GENEX_EVAL:$<TARGET_PROPERTY:nuttx,NUTTX_ELF_APP_COMPILE_OPTIONS>>)
    endif()
  else()
    set(TARGET "apps_${NAME}")
    add_custom_target(${TARGET})
    set_property(GLOBAL APPEND PROPERTY NUTTX_APPS_ONLY_REGISTER ${TARGET})
  endif()

  # apps applications need to depends on apps_context by default

  add_dependencies(${TARGET} apps_context)

  # store parameters into properties (used during builtin list generation)

  set_target_properties(${TARGET} PROPERTIES APP_MAIN ${NAME}_main)
  set_target_properties(${TARGET} PROPERTIES APP_NAME ${NAME})

  if(PRIORITY)
    set_target_properties(${TARGET} PROPERTIES APP_PRIORITY ${PRIORITY})
  else()
    set_target_properties(${TARGET} PROPERTIES APP_PRIORITY
                                               SCHED_PRIORITY_DEFAULT)
  endif()

  if(STACKSIZE)
    set_target_properties(${TARGET} PROPERTIES APP_STACK ${STACKSIZE})
  else()
    set_target_properties(${TARGET} PROPERTIES APP_STACK
                                               ${CONFIG_DEFAULT_TASK_STACKSIZE})
  endif()

  # compile options

  if(COMPILE_FLAGS)
    target_compile_options(${TARGET} PRIVATE ${COMPILE_FLAGS})
  endif()

  # compile definitions

  if(DEFINITIONS)
    target_compile_definitions(${TARGET} PRIVATE ${DEFINITIONS})
  endif()

  if(INCLUDE_DIRECTORIES)
    foreach(inc ${INCLUDE_DIRECTORIES})
      target_include_directories(${TARGET} PRIVATE ${inc})
    endforeach()
  endif()

  # add supplied dependencies

  if(DEPENDS)
    # using target_link_libraries for dependencies provides linking as well as
    # interface include and libraries
    foreach(dep ${DEPENDS})
      nuttx_add_dependencies(TARGET ${TARGET} DEPENDS ${dep})
      if(TARGET ${dep})
        get_target_property(dep_type ${dep} TYPE)
        if(${dep_type} STREQUAL "STATIC_LIBRARY")
          target_link_libraries(${TARGET} PRIVATE ${dep})
        endif()
      endif()

    endforeach()
  endif()
endfunction()