# Some IDF-specific functions and functions

include(crosstool_version_check)

#
# Set some variables used by rest of the build
#
# Note at the time this macro is expanded, the config is not yet
# loaded and the toolchain and project are not yet set
#
macro(idf_set_global_variables)
  # Note that CONFIG_xxx is not available when this function is called

  set_default(EXTRA_COMPONENT_DIRS "")

  # PROJECT_PATH has the path to the IDF project (top-level cmake directory)
  #
  # (cmake calls this CMAKE_SOURCE_DIR, keeping old name for compatibility.)
  set(PROJECT_PATH "${CMAKE_SOURCE_DIR}")

  # Note: "main" is no longer a component...
  #
  set_default(COMPONENT_DIRS "${PROJECT_PATH}/components ${EXTRA_COMPONENT_DIRS} ${IDF_PATH}/components")
  spaces2list(COMPONENT_DIRS)

  spaces2list(COMPONENTS)

  # Tell cmake to drop executables in the top-level build dir
  set(EXECUTABLE_OUTPUT_PATH "${CMAKE_BINARY_DIR}")

  # path to idf.py tool
  set(IDFTOOL ${PYTHON} "${IDF_PATH}/tools/idf.py")

  # generate compile_commands.json
  set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
endmacro()

# Add all the IDF global compiler & preprocessor options
# (applied to all components). Some are config-dependent
#
# If you only want to set options for a particular component,
# don't call or edit this function. TODO DESCRIBE WHAT TO DO INSTEAD
#
function(idf_set_global_compiler_options)
  add_definitions(-DESP_PLATFORM)
  add_definitions(-DHAVE_CONFIG_H)

  if(CONFIG_OPTIMIZATION_LEVEL_RELEASE)
    add_compile_options(-Os)
  else()
    add_compile_options(-Og)
  endif()

  add_c_compile_options(-std=gnu99)

  add_cxx_compile_options(-std=gnu++11 -fno-rtti)

  if(CONFIG_CXX_EXCEPTIONS)
    add_cxx_compile_options(-fexceptions)
  else()
    add_cxx_compile_options(-fno-exceptions)
  endif()

  # Default compiler configuration
  add_compile_options(-ffunction-sections -fdata-sections -fstrict-volatile-bitfields -mlongcalls -nostdlib)

  # Default warnings configuration
  add_compile_options(-Wall -Werror=all -Wno-error=unused-function -Wno-error=unused-but-set-variable -Wno-error=unused-variable -Wno-error=deprecated-declarations -Wextra -Wno-unused-parameter -Wno-sign-compare)
  add_c_compile_options(-Wno-old-style-declaration)

  # Stack protection
  if(NOT BOOTLOADER_BUILD)
    if(CONFIG_STACK_CHECK_NORM)
      add_compile_options(-fstack-protector)
    elseif(CONFIG_STACK_CHECK_STRONG)
      add_compile_options(-fstack-protector-strong)
    elseif(CONFIG_STACK_CHECK_ALL)
      add_compile_options(-fstack-protector-all)
    endif()
  endif()

  if(CONFIG_OPTIMIZATION_ASSERTIONS_DISABLED)
    add_definitions(-DNDEBUG)
  endif()

  # Always generate debug symbols (even in Release mode, these don't
  # go into the final binary so have no impact on size)
  add_compile_options(-ggdb)

  add_compile_options("-I${CMAKE_BINARY_DIR}") # for sdkconfig.h

endfunction(idf_set_global_compiler_options)


# Verify the IDF environment is configured correctly (environment, toolchain, etc)
function(idf_verify_environment)

  if(NOT CMAKE_PROJECT_NAME)
    message(FATAL_ERROR "Internal error, IDF project.cmake should have set this variable already")
  endif()

  # Check toolchain is configured properly in cmake
  if(NOT ( ${CMAKE_SYSTEM_NAME} STREQUAL "Generic" AND ${CMAKE_C_COMPILER} MATCHES xtensa))
    message(FATAL_ERROR "Internal error, toolchain has not been set correctly by project")
  endif()

  #
  # Warn if the toolchain version doesn't match
  #
  # TODO: make these platform-specific for diff toolchains
  gcc_version_check("5.2.0")
  crosstool_version_check("1.22.0-80-g6c4433a")

endfunction()

# idf_add_executable
#
# Calls add_executable to add the final project executable
# Adds .map & .bin file targets
# Sets up flash-related targets
function(idf_add_executable)
  set(exe_target ${PROJECT_NAME}.elf)
 
  spaces2list(MAIN_SRCS)
  add_executable(${exe_target} "${MAIN_SRCS}")

  add_map_file(${exe_target})

  add_flasher_argfile(${exe_target})

endfunction(idf_add_executable)


# add_map_file
#
# Set linker args for 'exe_target' to generate a linker Map file
function(add_map_file exe_target)
  get_filename_component(basename ${exe_target} NAME_WE)
  set(mapfile "${basename}.map")
  target_link_libraries(${exe_target} "-Wl,--gc-sections -Wl,--cref -Wl,--Map=${mapfile} -Wl,--start-group")
  set_property(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES "${CMAKE_CURRENT_BINARY_DIR}/${mapfile}")

  # add size targets, depend on map file, run idf_size.py
  add_custom_target(size
    DEPENDS ${exe_target}
    COMMAND ${PYTHON} ${IDF_PATH}/tools/idf_size.py ${mapfile}
    )
  add_custom_target(size-files
    DEPENDS ${exe_target}
    COMMAND ${PYTHON} ${IDF_PATH}/tools/idf_size.py --files ${mapfile}
    )
  add_custom_target(size-components
    DEPENDS ${exe_target}
    COMMAND ${PYTHON} ${IDF_PATH}/tools/idf_size.py --archives ${mapfile}
    )

endfunction(add_map_file)

# add_flasher_argfile
#
# Add argument file(s) for flashing the app, and for flashing the whole system
function(add_flasher_argfile)

  

endfunction(add_flasher_argfile)