# This is the default Makefile integrated
# by each Gem. It integrates important constants
# for usage inside of a Gem.

ifeq ($(strip $(MRUBY_ROOT)),)
  # mruby src root
  MRUBY_ROOT := $(realpath ../../..)
endif

# Tools
CC := gcc
RM := rm -f
AR := ar

# mruby compiler
ifeq ($(OS),Windows_NT)
MRBC = $(MRUBY_ROOT)/bin/mrbc.exe
else
MRBC = $(MRUBY_ROOT)/bin/mrbc
endif

SRC_DIR := src
MRB_DIR := mrblib
TEST_DIR := test

GEM_TEST_RB_FILES := $(wildcard $(TEST_DIR)/*.rb)
GEM_TEST_C_FILES := $(wildcard $(TEST_DIR)/*.c)

# LIBR can be manipulated with command line arguments
ifeq ($(strip $(LIBR)),)
  # default mruby library
  LIBR := $(MRUBY_ROOT)/lib/libmruby.a
endif

GEM_PACKAGE := mrb-$(GEM)-gem.a

ifeq ($(strip $(ACTIVE_GEMS)),)
  # the default file which contains the active GEMs
  ACTIVE_GEMS = GEMS.active
endif

MAKEFILE_GEM_LIST := $(MRUBY_ROOT)/mrbgems/g/MakefileGemList
-include $(MAKEFILE_GEM_LIST)

# Default rules which are calling the
# gem specific gem-all and gem-clean
# implementations of a gem

.PHONY : all
all : gem-info gem-all

gem-info:
	@echo "Building Gem '$(GEM)'"

# Building target for C and Ruby files
gem-c-and-rb-files : gem_mixlib.o
	$(AR) rs $(GEM_PACKAGE) $(GEM_OBJECTS) $^

gem_mixlib.c : gem_mrblib_header.ctmp gem_mrblib_irep.ctmp gem_mixlib_init.ctmp
	cat $^ > $@

gem_mixlib_init.ctmp :
	ruby $(MRUBY_ROOT)/mrbgems/generate_gem_mixlib.rb '$(GEM)' > $@

# Building target for C files
gem-c-files : gem_srclib.o
	$(AR) rs $(GEM_PACKAGE) $(GEM_OBJECTS) $<

gem_srclib.c :
	ruby $(MRUBY_ROOT)/mrbgems/generate_gem_srclib.rb '$(GEM)' > $@

# Building target for Ruby Files
gem-rb-files : gem_mrblib.o
	$(AR) rs $(GEM_PACKAGE) $<

gem_mrblib.c : gem_mrblib_header.ctmp gem_mrblib_irep.ctmp gem_mrblib_init.ctmp
	cat $^ > $@

gem_mrblib_header.ctmp :
	ruby $(MRUBY_ROOT)/mrbgems/generate_gem_mrblib_header.rb '$(GEM)' > $@

gem_mrblib_init.ctmp :
	ruby $(MRUBY_ROOT)/mrbgems/generate_gem_mrblib.rb '$(GEM)' > $@

gem_mrblib_irep.ctmp : gem_mrblib.rbtmp
	$(MRBC) -Bgem_mrblib_irep_$(subst -,_,$(GEM)) -o$@ $<

gem_mrblib.rbtmp :
		cat $(GEM_RB_FILES) > $@


gem_test.ctmp : gem_test.rbtmp $(GEM_TEST_C_FILES)
	$(MRBC) -Bgem_mrblib_irep_$(subst -,_,$(GEM))_test -o$@ $<
ifeq ($(GEM_TEST_C_FILES),)
		echo "void mrb_$(subst -,_,$(GEM))_gem_test_init(mrb_state* mrb) { }" >> $@
else
		cat $(GEM_TEST_C_FILES) >> $@
endif

gem_test.rbtmp : $(GEM_TEST_RB_FILES)
ifeq ($(GEM_TEST_RB_FILES),)
		echo > $@
else
		cat $(GEM_TEST_RB_FILES) > $@
endif

gem-test-c-and-rb-files : gem_test.ctmp

gem-test-c-files : gem_test.ctmp

gem-test-rb-files : gem_test.ctmp


gem-clean-c-and-rb-files :
	-$(RM) $(GEM_PACKAGE) gem_mixlib.o gem_mixlib.c gem_mrblib_header.ctmp gem_mrblib_irep.ctmp gem_mixlib_init.ctmp gem_mrblib.rbtmp
	-$(RM) gem_srclib.c gem_srclib.o $(GEM_OBJECTS) gem_test.ctmp gem_test.rbtmp gem-cflags.tmp gem-ldflags.tmp gem-libs.tmp

gem-clean-c-files :
	-$(RM) $(GEM_PACKAGE) gem_srclib.c gem_srclib.o $(GEM_OBJECTS) gem_test.ctmp gem_test.rbtmp gem-cflags.tmp gem-ldflags.tmp gem-libs.tmp

gem-clean-rb-files :
	-$(RM) $(GEM_PACKAGE) gem_mrblib.o gem_mrblib.c gem_mrblib_header.ctmp gem_mrblib_init.ctmp gem_mrblib_irep.ctmp gem_mrblib.rbtmp
	-$(RM) gem_test.ctmp gem_test.rbtmp gem-cflags.tmp gem-ldflags.tmp gem-libs.tmp


%.o : %.c
	$(CC) -c $(CFLAGS) $(CPPFLAGS) $(GEM_CFLAGS_LIST) $< -o $@

.PHONY : clean
clean : gem-clean
	@echo "Gem '$(GEM)' is clean"

.PHONY : gem-flags
gem-flags :
	@echo "$(MRUBY_CFLAGS) -I`pwd`/include" >  gem-cflags.tmp
	@echo "$(MRUBY_LDFLAGS)" >  gem-ldflags.tmp
	@echo "$(MRUBY_LIBS)" >  gem-libs.tmp