reverse = $(if $(1),$(call reverse,$(wordlist 2,$(words $(1)),$(1)))) $(firstword $(1))

ifeq (,$(BASE))
	export BASE=$(CURDIR)
endif


include $(BASE)/Makefile


ifeq (,$(MAKEBASE))
	export MAKEBASE=$(realpath $(firstword $(MAKEFILE_LIST)))
endif

ifneq (,$(wildcard $(BASE)/.depends.make))
	include $(wildcard $(BASE)/.depends.make)

	include $(realpath $(foreach CDEP,$(call reverse,$(COMPDEPENDS)),$(CDEP)/global.make))
	
	CDEPENDS=$(call reverse,$(COMPDEPENDS))
	DEPINC=$(CDEPENDS:%=-I%/include)

endif

ifeq (,$(FINALNAME))
	FINALNAME=$(notdir $(CURDIR))
endif

ifeq (,$(BUILDPID))
	export BUILDPID := $(shell echo $$PPID)
endif

MAKEME=$(MAKE) -f $(MAKEBASE)

GCC=$(COMPILER_PREFIX)gcc
AS=$(COMPILER_PREFIX)gcc
LD=$(COMPILER_PREFIX)gcc
AR=$(COMPILER_PREFIX)ar
SIZE=$(COMPILER_PREFIX)size
OBJCOPY=$(COMPILER_PREFIX)objcopy
AVRDUDE=sudo avrdude

PATH := /opt/local/bin:$(PATH)


ifeq ($(BASE),$(CURDIR))
	DEPLIBS:=$(foreach DEPLIB,$(CDEPENDS),$(BASE)/.build/libdep-$(subst /,_,$(DEPLIB).a))

	MODULENAMES:=$(notdir $(basename $(wildcard $(CURDIR)/src/*)))
	MODULES:=$(patsubst %,$(BASE)/.build/%.o,$(MODULENAMES))
	MODULEDEPS:=$(patsubst %,$(BASE)/.build/.%.o.dep,$(MODULENAMES))

else
	include $(CURDIR)/Makefile
	DEPENDSNEW=$(filter-out $(COMPDEPENDS),$(realpath $(DEPENDS)))

	MODULENAMES:=$(notdir $(basename $(wildcard $(CURDIR)/src/*)))
	MODULES:=$(patsubst %,$(BASE)/.build/libdep-$(subst /,_,$(CURDIR).a.d)/%.o,$(MODULENAMES))
	MODULEDEPS:=$(patsubst %,$(BASE)/.build/.%.o.dep,$(MODULENAMES))

endif


CFLAGS+=$(DEPINC)
CFLAGS+=-I$(CURDIR)/include

LDFLAGS+=$(foreach DEP,$(CDEPENDS),$(BASE)/.build/libdep-$(subst /,_,$(DEP)).a)
LDFLAGS+=$(foreach DEP,$(CDEPENDS),$(BASE)/.build/libdep-$(subst /,_,$(DEP)).a)


ifneq ($(AVR_FUSE_EXTENDED),)
	AVRDUDE_OPERATIONS+=-U efuse:w:$(AVR_FUSE_EXTENDED):m
endif
ifneq ($(AVR_FUSE_HIGH),)
	AVRDUDE_OPERATIONS+=-U hfuse:w:$(AVR_FUSE_HIGH):m
endif
ifneq ($(AVR_FUSE_LOW),)
	AVRDUDE_OPERATIONS+=-U lfuse:w:$(AVR_FUSE_LOW):m
endif
ifeq (,$(AVR_PROG))
	AVR_PROG=avrisp2
endif
ifeq (,$(AVR_BITCLK))
	AVR_BITCLK=16
endif
ifeq (,$(AVR_PORT))
	AVR_PORT=usb:
endif


.SILENT:
.PHONY: clean build null dependslibs libdep.a

null:

clean:
	rm -Rf $(BASE)/.build $(BASE)/src/.*.dep $(BASE)/bin $(BASE)/.depends.make

build: $(BASE)/.depends.make
	$(MAKEME) dependlibs
	$(MAKEME) build-me

dependlibs:
	mkdir -p $(BASE)/.build
	for SUBDIR in $(CDEPENDS); do $(MAKEME) -C $$SUBDIR libdep.a; done

$(BASE)/.depends.make: $(BASE)/Makefile
	echo "[ DEPSTART     ] $(CURDIR)"
#	echo "-------------------------------------"
#	echo "DEPENDS       = $(DEPENDS)"
#	echo "COMPDEPENDS   = $(COMPDEPENDS)"
#	echo "DEPENDSNEW    = $(DEPENDSNEW)"
#	echo "-------------------------------------"

	rm -f $@
	for SUBDIR in $(realpath $(DEPENDS)); do $(MAKEME) -C "$$SUBDIR" depwalk; done	

depwalk:
	echo "[ DEPEND       ] $(CURDIR)"
#	echo "-------------------------------------"
#	echo "DEPENDS       = $(DEPENDS)"
#	echo "COMPDEPENDS   = $(COMPDEPENDS)"
#	echo "DEPENDSNEW    = $(DEPENDSNEW)"
#	echo "-------------------------------------"
	
	echo "COMPDEPENDS+=$(CURDIR)" >> $(BASE)/.depends.make
	for SUBDIR in $(DEPENDSNEW); do $(MAKEME) -C "$$SUBDIR" depwalk; done
	
	

build-me:
	$(MAKEME) $(BASE)/bin/$(FINALNAME).hex

libdep.a: $(BASE)/.build/libdep-$(subst /,_,$(CURDIR)).a
	
$(BASE)/.build/libdep-$(subst /,_,$(CURDIR)).a.d:
	mkdir -p $@

$(BASE)/.build/libdep-$(subst /,_,$(CURDIR)).a: $(BASE)/.build/libdep-$(subst /,_,$(CURDIR)).a.d $(MODULES)
	echo "[ LIBDEP       ] $(CURDIR)"
	$(AR) rc $@ $(filter-out $(BASE)/.build/libdep-$(subst /,_,$(CURDIR)).a.d,$^)

$(BASE)/.build/libdep-$(subst /,_,$(CURDIR)).a.d/%.o: $(CURDIR)/src/%.c
	echo "[ COMPILE C    ] $<"
	#echo "[ CFLAGS       ] $(CFLAGS)"
	$(GCC) -c -o $@ $< -MMD -MF "$(dir $@)/.$(notdir $@).dep" $(CFLAGS)

$(BASE)/.build/libdep-$(subst /,_,$(CURDIR)).a.d/%.o: $(CURDIR)/src/%.S
	echo "[ ASSEMBLE     ] $<"
	$(GCC) -c -o $@ $< $(ASFLAGS)

$(BASE)/.build/libdep-$(subst /,_,$(CURDIR)).a.d/%.o: $(CURDIR)/src/%.cc
	echo "[ COMPILE C++  ] $<"
	$(GCC) -c -o $@ $< -MMD -MF "$(dir $@)/.$(notdir $@).dep" $(CFLAGS) $(CPPFLAGS)

$(BASE)/.build/libdep-$(subst /,_,$(CURDIR)).a.d/%.o: $(CURDIR)/src/%.txt
	echo "[ IGNORE       ] $<"
	touch $@


$(BASE)/bin/$(FINALNAME).elf: $(DEPLIBS) $(MODULES)
	echo "[ LINK         ] $@"
	mkdir -p $(dir $@)
	$(LD) -o $@ $^ $(LDFLAGS)
	$(SIZE) $@

$(BASE)/bin/$(FINALNAME).hex: $(BASE)/bin/$(FINALNAME).elf
	echo "[ ELF -> HEX   ] $@"
	$(OBJCOPY) -O ihex $< $@
	
$(BASE)/.build/%.o: $(CURDIR)/src/%.c
	echo "[ COMPILE C    ] $<"
	$(GCC) -c -o $@ $< -MMD -MP -MF "$(dir $@)/.$(notdir $@).dep" $(CFLAGS)

$(BASE)/.build/%.o: $(CURDIR)/src/%.S
	echo "[ ASSEMBLE     ] $<"
	$(GCC) -c -o $@ $< $(ASFLAGS)

$(BASE)/.build/%.o: $(CURDIR)/src/%.cc
	echo "[ COMPILE C++  ] $<"
	$(GCC) -c -o $@ $< -MMD -MF "$(dir $@)/.$(notdir $@).dep" $(CFLAGS) $(CPPFLAGS)

$(BASE)/.build/%.o: $(CURDIR)/src/%.txt
	echo "[ IGNORE       ] $<"
	touch $@


$(BASE)/.build/.%.dep:

avrdude: build $(BASE)/bin/$(FINALNAME).hex
	$(AVRDUDE) -v -c $(AVR_PROG) -p $(AVR_MCU) -P $(AVR_PORT) -B $(AVR_BITCLK) $(AVRDUDE_OPERATIONS) -U flash:w:$(BASE)/bin/$(FINALNAME).hex

include $(wildcard $(MODULEDEPS))