include_guard(GLOBAL)

file(RELATIVE_PATH REL_PATH ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_LIST_DIR})
include_directories(${CMAKE_CURRENT_BINARY_DIR}/${REL_PATH})

unset(HECL_APPLICATION_REPS_TARGETS_LIST CACHE)
unset(HECL_APPLICATION_REPS_INCLUDES_LIST CACHE)
unset(HECL_APPLICATION_PIPELINE_REPS_UNIVERSAL CACHE)
unset(HECL_APPLICATION_PIPELINE_REPS CACHE)
unset(HECL_APPLICATION_STAGE_REPS CACHE)

# add_pipeline_rep(my::fully::qualified::class my_class_header.hpp [UNIVERSAL])
function(add_pipeline_rep name header)
  if(IS_ABSOLUTE ${header})
    set(theHeader ${header})
  else()
    set(theHeader ${CMAKE_CURRENT_SOURCE_DIR}/${header})
  endif()
  if (NOT ${theHeader} IN_LIST HECL_APPLICATION_REPS_INCLUDES_LIST)
    set(HECL_APPLICATION_REPS_INCLUDES_LIST "${HECL_APPLICATION_REPS_INCLUDES_LIST};${theHeader}" CACHE INTERNAL "")
  endif()
  if ("${ARGV2}" STREQUAL "UNIVERSAL")
    set(HECL_APPLICATION_PIPELINE_REPS_UNIVERSAL "${HECL_APPLICATION_PIPELINE_REPS_UNIVERSAL};${name}" CACHE INTERNAL "")
  else()
    set(HECL_APPLICATION_PIPELINE_REPS "${HECL_APPLICATION_PIPELINE_REPS};${name}" CACHE INTERNAL "")
  endif()
endfunction()

# add_stage_rep(my::fully::qualified::class my_class_header.hpp)
function(add_stage_rep name header)
  if(IS_ABSOLUTE ${header})
    set(theHeader ${header})
  else()
    set(theHeader ${CMAKE_CURRENT_SOURCE_DIR}/${header})
  endif()
  if (NOT ${theHeader} IN_LIST HECL_APPLICATION_REPS_INCLUDES_LIST)
    set(HECL_APPLICATION_REPS_INCLUDES_LIST "${HECL_APPLICATION_REPS_INCLUDES_LIST};${theHeader}" CACHE INTERNAL "")
  endif()
  set(HECL_APPLICATION_STAGE_REPS "${HECL_APPLICATION_STAGE_REPS};${name}" CACHE INTERNAL "")
endfunction()

function(add_shader_target target)
  if (NOT ${target} IN_LIST HECL_APPLICATION_REPS_TARGETS_LIST)
    set(HECL_APPLICATION_REPS_TARGETS_LIST "${HECL_APPLICATION_REPS_TARGETS_LIST};${target}" CACHE INTERNAL "")
  endif()
endfunction()

function(add_shader file)
  get_filename_component(name ${file} NAME)
  get_filename_component(dir ${file} DIRECTORY)
  shaderc(${CMAKE_CURRENT_BINARY_DIR}/${dir}/shader_${name} ${file}.shader)
  add_stage_rep(shader_${name} ${CMAKE_CURRENT_BINARY_DIR}/${dir}/shader_${name}.hpp)
  add_pipeline_rep(shader_${name} ${CMAKE_CURRENT_BINARY_DIR}/${dir}/shader_${name}.hpp UNIVERSAL)
  add_library(shader_${name} ${CMAKE_CURRENT_BINARY_DIR}/${dir}/shader_${name}.hpp ${CMAKE_CURRENT_BINARY_DIR}/${dir}/shader_${name}.cpp)
  add_shader_target(shader_${name})
endfunction()

function(add_special_shader name)
  add_stage_rep(${name} ${name}.hpp)
  add_pipeline_rep(${name} ${name}.hpp UNIVERSAL)
  add_library(${name} ${name}.hpp ${ARGN})
  add_shader_target(${name})
endfunction()