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#

# @brief	CMake package for handling configuration headers in campo projects

#

#    An configuration header can be specified via cmake variable 

#    COMMON_CONFIG_HEADER. 

#    This header will not be included directly but another configuration header

#    Will be generated with project specific defines only.

#    This generated header could then be installed into a sysroot.

#

#    There is also a checksum included in the header as define which can be 

#    used verified that used headers match used library binary.

#

#    In the CMakeLists.txt, "add_generated_config( <target> )" has to be added 

#    after declaring the target.

#

#    In source code, the define <PROJECT>_GENERATED_CONFIG has to be used to 

#    check weather the generated header has to be included or the one from the 

#    sysroot.

#

# @author     Maximilian Seesslen <src@seesslen.net>

# @copyright  SPDX-License-Identifier: Apache-2.0

#

#------------------------------------------------------------------------------

function( add_generated_config project )

   d

   # It's not guaranteed that the target is equal to ${PROJECT_NAME}

   # set( project ${PROJECT_NAME} )

   string(TOUPPER ${project} PROJECT )

   get_property(

      TARGET_DEFS

      TARGET ${project}

      PROPERTY COMPILE_DEFINITIONS

   )

   get_target_property(

      INTERFACE_DEFS

      ${project}

      INTERFACE_COMPILE_DEFINITIONS

   )

   get_directory_property(

      DIRECTORY_DEFS

      COMPILE_DEFINITIONS

   )

   # get_property(XDEFS DIRECTORY PROPERTY COMPILE_DEFINITIONS)

   # message( FATAL_ERROR "### CD ${XDEFS}")

   list( APPEND DEFS  ${DIRECTORY_DEFS} ${TARGET_DEFS} ${INTERFACE_DEFS} )

   list( TRANSFORM DEFS PREPEND "-D" )

   if ( COMMON_CONFIG_HEADER )

      set ( ${PROJECT}_CONFIG_HEADER "${COMMON_CONFIG_HEADER${VARIANT_POSTFIX_UPPER_CASE}}" PARENT_SCOPE)

      set ( ${PROJECT}_CONFIG_HEADER "${COMMON_CONFIG_HEADER${VARIANT_POSTFIX_UPPER_CASE}}")

      if( NOT COMMON_CONFIG_HEADER${VARIANT_POSTFIX_UPPER_CASE} )

         message( WARNING "A variant '${VARIANT_POSTFIX}' is used but the common header is not defined for it.")

         message( WARNING " Please set COMMON_CONFIG_HEADER${VARIANT_POSTFIX_UPPER_CASE} in top level cmake file." ) 

         message( WARNING " I will use COMMON_CONFIG_HEADER instead." ) 

         set ( ${PROJECT}_CONFIG_HEADER "${COMMON_CONFIG_HEADER}" PARENT_SCOPE)

         set ( ${PROJECT}_CONFIG_HEADER "${COMMON_CONFIG_HEADER}")

      endif()

   elseif( NOT ${PROJECT}_CONFIG_HEADER )

      set ( ${PROJECT}_CONFIG_HEADER "${CMAKE_CURRENT_SOURCE_DIR}/include/${project}/presets/config_full.h" PARENT_SCOPE)

      set ( ${PROJECT}_CONFIG_HEADER "${CMAKE_CURRENT_SOURCE_DIR}/include/${project}/presets/config_full.h")

   endif()

   set( input_header ${${PROJECT}_CONFIG_HEADER} )

   set( generated_header ${CMAKE_CURRENT_BINARY_DIR}/${project}/config_generated_local.h )

   if( NOT ${PROJECT}_CONFIG_HEADER )

      message( FATAL_ERROR "Config header could not be evaluated." )

   endif()

   add_custom_command(

      OUTPUT ${generated_header}

      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}

      COMMAND

         mkdir -p ${CMAKE_CURRENT_BINARY_DIR}/${project}

      COMMAND

         echo "// Generated configuration header. Do not change!" > ${generated_header}

      COMMAND

         ${CMAKE_CXX_COMPILER} -include ${input_header} ${DEFS}

            -dM -E - < /dev/null >> ${CMAKE_CURRENT_BINARY_DIR}/config_generated_${project}_all.h

      COMMAND

         ${CMAKE_CXX_COMPILER} -include ${input_header} ${DEFS}

            -dM -E - < /dev/null | grep CONFIG_${PROJECT} >> ${generated_header}

      COMMAND

         echo -n "\\#define ${PROJECT}_CONFIG_CHECKSUM 0x" >> ${generated_header}

      COMMAND

         bash -c 'sha256sum ${generated_header} | cut -c1-8' >> ${generated_header}

      COMMAND

         echo  "\\#define ${project}_CONFIG_CHECKSUM ${PROJECT}_CONFIG_CHECKSUM" >> ${generated_header}

      COMMAND

         echo -n "\\#define ${PROJECT}_CODE_SHA 0x" >> ${generated_header}

      COMMAND

         git --git-dir=${CMAKE_CURRENT_SOURCE_DIR}/.git rev-parse HEAD | head -c8  >> ${generated_header}

      COMMAND

         echo >> ${generated_header}

      COMMAND

         echo  "\\#define ${project}_CODE_SHA ${PROJECT}_CODE_SHA" >> ${generated_header}

      COMMAND

         echo  "\\#define ${PROJECT}_CONFIGURED 1" >> ${generated_header}

      COMMAND

         echo >> ${generated_header}

      COMMAND

         echo "//--- Fin ---------------------------" >> ${generated_header}

      DEPENDS ${input_header}

   )

   #add_custom_target(

   #   generate_config_${project}

   #   DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/config_generated_${project}.h

   #)

# endfunction()

# function( use_generated_config project )

   # string(TOUPPER ${project} PROJECT )

   target_compile_definitions(

      ${project}

      PUBLIC

         -D${PROJECT}_LOCAL_CONFIG

   )

   target_include_directories(

      ${project}

      PUBLIC

         ${CMAKE_CURRENT_BINARY_DIR}

   )

   # message( FATAL_ERROR "### Header: ${CMAKE_CURRENT_BINARY_DIR}/${project}/config_generated_local.h" )

   #add_dependencies( ${project} generate_config_${project} )

   target_sources(

      ${project}

      PUBLIC

         ${generated_header}

   )

   #add_dependencies( ${project} generate_config_${project} )

endfunction()

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