ifeq ($(TARGET),3DS)
	ifeq ($(strip $(DEVKITPRO)),)
		$(error "Please set DEVKITPRO in your environment. export DEVKITPRO=<path to>devkitPro")
	endif

	ifeq ($(strip $(DEVKITARM)),)
		$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
	endif
endif

# TOOLS #

BUILDTOOLS_DIR := $(dir $(lastword $(MAKEFILE_LIST)))

define createdirrule
$(1): | $(dir $(1))

ifndef $(dir $(1))_DIRECTORY_RULE_IS_DEFINED
$(dir $(1)):
	@mkdir -p $$@

$(dir $(1))_DIRECTORY_RULE_IS_DEFINED := 1
endif
endef

rwildcard=$(wildcard $1/$2) $(foreach d,$(wildcard $1/*),$(call rwildcard,$d,$2))

# SETUP #

OBJECT_FILES := $(foreach dir,$(SOURCE_DIRS), \
			$(patsubst %.c,$(BUILD_DIR)/%.o,$(call rwildcard,$(dir),*.c)) \
			$(patsubst %.cpp,$(BUILD_DIR)/%.o,$(call rwildcard,$(dir),*.cpp)) \
			$(patsubst %.s,$(BUILD_DIR)/%.o,$(call rwildcard,$(dir),*.s)) \
			$(patsubst %.bin,$(BUILD_DIR)/%.bin.o,$(call rwildcard,$(dir),*.bin)) \
			$(patsubst %.v.pica,$(BUILD_DIR)/%.shbin.o,$(call rwildcard,$(dir),*.v.pica)) \
			$(patsubst %.shlist,$(BUILD_DIR)/%.shbin.o,$(call rwildcard,$(dir),*.shlist)) \
		)

OUTPUT_ZIP_FILE := $(OUTPUT_DIR)/$(NAME).zip
ifeq ($(LIBRARY),1)
	OUTPUT_FILES := $(OUTPUT_DIR)/lib$(NAME).a $(OUTPUT_DIR)/lib$(NAME).so
else ifeq ($(TARGET),3DS)
	OUTPUT_FILES := $(OUTPUT_DIR)/$(NAME).elf $(OUTPUT_DIR)/3ds/$(NAME)/$(NAME).smdh $(OUTPUT_DIR)/3ds/$(NAME)/$(NAME).3dsx $(OUTPUT_DIR)/$(NAME).3ds $(OUTPUT_DIR)/$(NAME).cia
else
	OUTPUT_FILES := $(OUTPUT_DIR)/$(NAME)
endif

ifeq ($(TARGET),3DS)
	AR := $(DEVKITARM)/bin/arm-none-eabi-ar
	AS := $(DEVKITARM)/bin/arm-none-eabi-as
	CC := $(DEVKITARM)/bin/arm-none-eabi-gcc
	CXX := $(DEVKITARM)/bin/arm-none-eabi-g++
else
	AR := ar
	AS := as
	CC := gcc
	CXX := g++
endif

LD_FLAGS := $(patsubst %,-L%/lib,$(LIBRARY_DIRS)) $(patsubst %,-l%,$(LIBRARIES))
COMMON_CC_FLAGS := $(patsubst %,-I%,$(INCLUDE_DIRS)) $(patsubst %,-I%/include,$(LIBRARY_DIRS)) -g -Wall -O2 $(BUILD_FLAGS)
ifeq ($(LIBRARY),1)
	COMMON_CC_FLAGS += -fPIC
endif

ifeq ($(TARGET),3DS)
	COMMON_CC_FLAGS += -mword-relocations -fomit-frame-pointer -ffast-math -march=armv6k -mtune=mpcore -mfloat-abi=hard -mtp=soft -DARM11 -D_3DS
	LD_FLAGS += -specs=3dsx.specs
endif

CC_FLAGS := $(COMMON_CC_FLAGS) -std=gnu99
CXX_FLAGS := $(COMMON_CC_FLAGS) -std=gnu++11

ifeq ($(TARGET),3DS)
	ifeq ($(suffix $(BANNER_IMAGE)),".cgfx")
		BANNER_IMAGE_ARG := -ci
	else
		BANNER_IMAGE_ARG := -i
	endif

	ifeq ($(suffix $(BANNER_AUDIO)),".cwav")
		BANNER_AUDIO_ARG := -ca
	else
		BANNER_AUDIO_ARG := -a
	endif

	RSF := $(BUILDTOOLS_DIR)/3ds/template.rsf

	ROMFS_PARAM :=
	ifneq ("$(wildcard $(ROMFS_DIR))","")
		ROMFS_PARAM := -DAPP_ROMFS="RootPath: $(ROMFS_DIR)"
	endif

	COMMON_MAKEROM_PARAMS := -rsf $(RSF) -target t -exefslogo -icon $(BUILD_DIR)/icon.icn -banner $(BUILD_DIR)/banner.bnr -DAPP_TITLE="$(NAME)" -DAPP_PRODUCT_CODE="$(PRODUCT_CODE)" -DAPP_UNIQUE_ID="$(UNIQUE_ID)" $(ROMFS_PARAM) -DAPP_SYSTEM_MODE="$(SYSTEM_MODE)" -DAPP_SYSTEM_MODE_EXT="$(SYSTEM_MODE_EXT)"

	SMDHTOOL := $(DEVKITARM)/bin/smdhtool
	_3DSXTOOL := $(DEVKITARM)/bin/3dsxtool

	ifeq ($(OS),Windows_NT)
		MAKEROM := $(BUILDTOOLS_DIR)/3ds/makerom.exe
		BANNERTOOL := $(BUILDTOOLS_DIR)/3ds/bannertool.exe
	else
		UNAME_S := $(shell uname -s)
		ifeq ($(UNAME_S),Linux)
			MAKEROM := $(BUILDTOOLS_DIR)/3ds/makerom-linux
			BANNERTOOL := $(BUILDTOOLS_DIR)/3ds/bannertool-linux
		endif
		ifeq ($(UNAME_S),Darwin)
			MAKEROM := $(BUILDTOOLS_DIR)/3ds/makerom-mac
			BANNERTOOL := $(BUILDTOOLS_DIR)/3ds/bannertool-mac
		endif
	endif

	_3DSXFLAGS :=
	ifneq ("$(wildcard $(ROMFS_DIR))","")
		_3DSXFLAGS += --romfs=$(ROMFS_DIR)
	endif
endif

# RULES #

.PHONY: all run clean
.PRECIOUS: %.bnr %.icn

all: $(OUTPUT_ZIP_FILE)

ifneq ($(LIBRARY),1)
run: $(OUTPUT_FILES)
	./$< $(RUN_FLAGS)
endif

clean:
	@rm -rf $(BUILD_DIR) $(OUTPUT_DIR)
	@echo "Cleaned."

$(foreach file,$(OBJECT_FILES),$(eval $(call createdirrule,$(file))))
$(foreach file,$(OUTPUT_FILES),$(eval $(call createdirrule,$(file))))

$(OUTPUT_ZIP_FILE): $(OUTPUT_FILES)
	@echo $@
	@cd $(OUTPUT_DIR); \
	zip -r $(patsubst $(OUTPUT_DIR)/%,%,$@ $^) > /dev/null

$(OUTPUT_DIR)/$(NAME): $(OBJECT_FILES)
	@echo $@
	@$(CXX) $(CXX_FLAGS) $^ -o $@ $(LD_FLAGS)

%.elf: $(OBJECT_FILES)
	@echo $@
	@$(CXX) $(CXX_FLAGS) $^ -o $@ $(LD_FLAGS)

%.a: $(OBJECT_FILES)
	@echo $@
	@$(AR) -rc $@ $^

%.so: $(OBJECT_FILES)
	@echo $@
	@$(CXX) $(CXX_FLAGS) -shared $^ -o $@ $(LD_FLAGS)

$(BUILD_DIR)/%.o: %.c
	@echo $@
	@$(CC) -c $(CC_FLAGS) -MMD -MP -MF $(BUILD_DIR)/$*.d $< -o $@

$(BUILD_DIR)/%.o: %.cpp
	@echo $@
	@$(CXX) -c $(CXX_FLAGS) -MMD -MP -MF $(BUILD_DIR)/$*.d $< -o $@

$(BUILD_DIR)/%.o: %.s
	@echo $@
	@$(CC) -c $(CC_FLAGS) -MMD -MP -MF -x assembler-with-cpp $(BUILD_DIR)/$*.d $< -o $@

$(BUILD_DIR)/%.o: %.S
	@echo $@
	@$(CC) -c $(CC_FLAGS) -MMD -MP -MF -x assembler-with-cpp $(BUILD_DIR)/$*.d $< -o $@

ifeq ($(TARGET),3DS)
define bin2o
	bin2s $< | $(AS) -o $(@)
	echo "extern const u8" `(echo $(<F) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"_end[];" > `(echo $(<F) | tr . _)`.h
	echo "extern const u8" `(echo $(<F) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"[];" >> `(echo $(<F) | tr . _)`.h
	echo "extern const u32" `(echo $(<F) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`_size";" >> `(echo $(<F) | tr . _)`.h
endef

$(BUILD_DIR)/%.bin.o: %.bin
	@echo $@
	@$(bin2o)

define shader-as
	$(eval CURBIN := $(patsubst %.shbin.o,%.shbin,$(notdir $@)))
	picasso -o $(CURBIN) $1
	bin2s $(CURBIN) | $(AS) -o $@
	echo "extern const u8" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"_end[];" > `(echo $(CURBIN) | tr . _)`.h
	echo "extern const u8" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"[];" >> `(echo $(CURBIN) | tr . _)`.h
	echo "extern const u32" `(echo $(CURBIN) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`_size";" >> `(echo $(CURBIN) | tr . _)`.h
endef

$(BUILD_DIR)/%.shbin.o : %.v.pica %.g.pica
	@echo $@
	@$(call shader-as,$^)

$(BUILD_DIR)/%.shbin.o : %.v.pica
	@echo $@
	@$(call shader-as,$<)

$(BUILD_DIR)/%.shbin.o : %.shlist
	@echo $@
	@$(call shader-as,$(foreach file,$(shell cat $<),$(dir $<)/$(file)))

%.bnr: $(BANNER_IMAGE) $(BANNER_AUDIO)
	@echo $@
	@$(BANNERTOOL) makebanner $(BANNER_IMAGE_ARG) $(BANNER_IMAGE) $(BANNER_AUDIO_ARG) $(BANNER_AUDIO) -o $@ > /dev/null

%.icn: $(ICON)
	@echo $@
	@$(BANNERTOOL) makesmdh -s "$(NAME)" -l "$(DESCRIPTION)" -p "$(AUTHOR)" -i $(ICON) -o $@ > /dev/null

%.smdh: $(ICON)
	@echo $@
	@$(SMDHTOOL) --create "$(NAME)" "$(DESCRIPTION)" "$(AUTHOR)" $(ICON) $@

$(OUTPUT_DIR)/3ds/$(NAME)/%.3dsx: $(OUTPUT_DIR)/%.elf $(OUTPUT_DIR)/3ds/$(NAME)/%.smdh
	@echo $@
	@$(_3DSXTOOL) $< $@ --smdh=$(word 2,$^) $(_3DSXFLAGS)

%.3ds: %.elf $(BUILD_DIR)/banner.bnr $(BUILD_DIR)/icon.icn
	@echo $@
	@$(MAKEROM) -f cci -o $@ -elf $< -DAPP_ENCRYPTED=true $(COMMON_MAKEROM_PARAMS)

%.cia: %.elf $(BUILD_DIR)/banner.bnr $(BUILD_DIR)/icon.icn
	@echo $@
	@$(MAKEROM) -f cia -o $@ -elf $< -DAPP_ENCRYPTED=false $(COMMON_MAKEROM_PARAMS)
endif

# DEPENDS #

DEPENDS	:= $(OBJECT_FILES:.o=.d)
-include $(DEPENDS)