# PURPOSE: If an appBuilder file is specified, this code converts it
# into a makefile fragment.  If no appBuilder file is created, this
# code ensures the mandatory variables are set.

app_builder_non_app_vars=COMPONENTS CHOSEN_MODULE CONFIGURE_NEMS_FILE EXTERNALS_NEMS_FILE CONFOPT
all_app_builder_files=${shell ls $(ROOTDIR)/*.appBuilder}
all_app_builds=${foreach file,$(all_app_builder_files),${notdir ${subst .appBuilder,,${notdir $(file)}}}}

# Special flag to increase verbosity when scanning appBuilder files:
VERBOSE_MAKE?=NO

# NOTE: nothing else in this file is executed unless an app is specified.

########################################################################

ifneq ($(app),)

  # User is using an app
  ifeq ($(app),)
    define app_error

Known apps: $(all_app_builds)
Specify the app to build
    endef
  ${error $(app_error)}
  endif

  ifneq ($(filter $(app),$(all_app_builds)),$(app))
    define app_error

Known apps: $(all_app_builds)
Unknown app $(app).  Specify a valid app
    endef
    ${error $(app_error)}
  endif

  app_builder_file=$(ROOTDIR)/$(app).appBuilder
  app_builder_makefile=$(ROOTDIR)/$(app).appBuilder.mk

########################################################################

# Convert the appBuilder file to a makefile

# --------------------------- define shell_prep_logic -------------------------
define shell_prep_logic

if [[ $(VERBOSE_MAKE) == YES ]] ; then
  echo 1>&2
  echo ------------------------------------------------------------------------ 1>&2
  echo '\''                          READ APPBUILDER FILE '\'' 1>&2
  echo 1>&2
  echo FROM $(app_builder_file) 1>&2
  echo INTO $(app_builder_makefile) 1>&2
fi

export FULL_MACHINE_ID='\''$(FULL_MACHINE_ID)'\''
export MACHINE_ID='\''$(MACHINE_ID)'\''
export NEMSDIR='\''$(NEMSDIR)'\''
export ROOTDIR='\''$(ROOTDIR)'\''
export PEX='\''$(PEX)'\''
export MACHINE_ID_DOT='\''$(MACHINE_ID_DOT)'\''
export MACHINE_ID_UNDER='\''$(MACHINE_ID_UNDER)'\''
export FULL_MACHINE_ID_DOT='\''$(FULL_MACHINE_ID_DOT)'\''
export FULL_MACHINE_ID_UNDER='\''$(FULL_MACHINE_ID_UNDER)'\''
source $(app_builder_file) > /dev/null

if [[ "$(VERBOSE_MAKE)" == YES ]] ; then
  echo 1>&2
  echo \# NON-COMPONENT-SPECIFIC VARS: 1>&2
  echo 1>&2
fi

cat<<EOT > $(app_builder_makefile)
# Do not edit this file.  It is generated from:
#    $(app_builder_file)
# Edit that file instead.
EOT

for var in $${VARS} ; do
  value=$$( eval echo '\''$${'\''"$${var}"'\''[@]}'\'' )
  if [[ "Q$${value}" != Q ]] ; then
    echo $$var \?= $$value
    if [[ "$(VERBOSE_MAKE)" == YES ]] ; then
      echo $$var \?= \"$$value\" 1>&2
    fi
  fi
done >> "$(app_builder_makefile)"

if [[ "$(VERBOSE_MAKE)" == YES ]] ; then
  echo 1>&2
  echo \# COMPONENT-SPECIFIC VARS FOR: \[ $${COMPONENTS[@]} \] 1>&2
fi

for component in $${COMPONENTS[@]} ; do
  if [[ $(VERBOSE_MAKE) == YES ]] ; then
    echo 1>&2
  fi
  for var in $${component}_CAPDIR $${component}_BINDIR $${component}_SRCDIR $${component}_CONFOPT $${component}_BUILDOPT $${component}_MAKEOPT ; do
    value=$$( eval echo '\''$${'\''"$${var}"'\''[@]}'\'' )
    if [[ "$${value}Q" != Q ]] ; then
      echo $$var \?= $$value
      if [[ "$(VERBOSE_MAKE)" == YES ]] ; then
        echo $$var \?= \"$$value\" 1>&2
      fi
    fi
  done
done >> $(app_builder_makefile)

if [[ "$(VERBOSE_MAKE)" == YES ]] ; then
  echo 1>&2
  echo ------------------------------------------------------------------------ 1>&2
  echo 1>&2
fi

echo DONE
endef
# ---------------------------- endef shell_prep_logic -------------------------

  read_app_builder = $(shell bash -c 'export VARS="$(1)" ; $(shell_prep_logic)' )

  $(info Convert $(app_builder_file))
  $(info ...into $(app_builder_makefile))
  ifneq (,$(call read_app_builder,$(app_builder_non_app_vars)))
    $(info Include $(app_builder_makefile))
    include $(app_builder_makefile)
  else
    $(error Could not parse $(app_builder_file))
  endif
endif