#---------------------------------------------------------------------------------
.SUFFIXES:
#---------------------------------------------------------------------------------

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

include $(DEVKITARM)/gba_rules

#---------------------------------------------------------------------------------
# TARGET is the name of the output
# BUILD is the directory where object files & intermediate files will be placed
# SOURCES is a list of directories containing source code
# INCLUDES is a list of directories containing extra header files
# DATA is a list of directories containing binary data
# GRAPHICS is a list of directories containing files to be processed by grit
#
# All directories are specified relative to the project directory where
# the makefile is found
#
#---------------------------------------------------------------------------------
TARGET		:= $(notdir $(CURDIR))
BUILD		:= build
SOURCES		:= source
INCLUDES	:= include
DATA		:= data
SOUND		:= sound
GRAPHICS	:= graphics
GENERATED	:= generated
#---------------------------------------------------------------------------------
# options for code generation
#---------------------------------------------------------------------------------
ARCH	:=	-mthumb -mthumb-interwork

CFLAGS	:=	-g -Wall -O2\
		-mcpu=arm7tdmi -mtune=arm7tdmi\
		$(ARCH)

CFLAGS	+=	$(INCLUDE)

CXXFLAGS	:=	$(CFLAGS) -fno-rtti -fno-exceptions

ASFLAGS	:=	-g $(ARCH)
LDFLAGS	=	-g $(ARCH) -Wl,-Map,$(notdir $*.map)

#---------------------------------------------------------------------------------
# any extra libraries we wish to link with the project
#---------------------------------------------------------------------------------
LIBS	:= -lmm -lgba


#---------------------------------------------------------------------------------
# list of directories containing libraries, this must be the top level containing
# include and lib
#---------------------------------------------------------------------------------
LIBDIRS	:=	$(LIBGBA)

#---------------------------------------------------------------------------------
# no real need to edit anything past this point unless you need to add additional
# rules for different file extensions
#---------------------------------------------------------------------------------


ifneq ($(BUILD),$(notdir $(CURDIR)))
#---------------------------------------------------------------------------------

export OUTPUT	:=	$(CURDIR)/$(TARGET)

export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
			$(foreach dir,$(DATA),$(CURDIR)/$(dir)) \
			$(foreach dir,$(GRAPHICS),$(CURDIR)/$(dir)) \
			$(CURDIR)/$(GENERATED)

export DEPSDIR	:=	$(CURDIR)/$(BUILD)

CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))

ifneq ($(strip $(SOUND)),)
	export MODFILES	:=	$(foreach dir,$(notdir $(wildcard $(SOUND)/*.mod)),$(CURDIR)/$(SOUND)/$(dir))
	export SFXFILES	:=	$(foreach dir,$(notdir $(wildcard $(SOUND)/*.wav)),$(CURDIR)/$(SOUND)/$(dir))
	BINFILES += soundbank.bin
endif

ifneq ($(strip $(GRAPHICS)),)
	export GRAPHICSFILES	:=	$(foreach dir,$(notdir $(wildcard $(GRAPHICS)/*.png)),$(CURDIR)/$(GRAPHICS)/$(dir))
endif

# Add generated bin files if they exist
ifneq ($(wildcard $(GENERATED)/*.bin),)
	BINFILES += $(notdir $(wildcard $(GENERATED)/*.bin))
endif

#---------------------------------------------------------------------------------
# use CXX for linking C++ projects, CC for standard C
#---------------------------------------------------------------------------------
ifeq ($(strip $(CPPFILES)),)
#---------------------------------------------------------------------------------
	export LD	:=	$(CC)
#---------------------------------------------------------------------------------
else
#---------------------------------------------------------------------------------
	export LD	:=	$(CXX)
#---------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------

export OFILES_BIN := $(addsuffix .o,$(BINFILES))

export OFILES_SOURCES := $(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)

export OFILES := $(OFILES_BIN) $(OFILES_SOURCES)

export HFILES := $(addsuffix .h,$(subst .,_,$(BINFILES)))

export INCLUDE	:=	$(foreach dir,$(INCLUDES),-iquote $(CURDIR)/$(dir)) \
					$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
					-I$(CURDIR)/$(BUILD)

export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)

.PHONY: $(BUILD) clean process-images process-binaries

#---------------------------------------------------------------------------------
$(BUILD): process-images process-binaries
	@[ -d $(BUILD) ] || mkdir -p $(BUILD)
	@cp $(SOURCES)/*.h $(BUILD)/ 2>/dev/null || true
	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile

#---------------------------------------------------------------------------------
clean:
	@echo clean ...
	@rm -fr $(BUILD) $(TARGET).elf $(TARGET).gba


process-images: $(GRAPHICSFILES)
	@[ -d $(GENERATED) ] || mkdir -p $(GENERATED)
	@echo "Processing ALL images"
	@for img in $^; do \
		depth=$$(magick identify -format "%[depth]" $$img); \
		base=$$(basename $$img .png); \
		if [ "$$depth" = "8" ]; then \
			$(MAKE) $${base}_8.bin; \
		else \
			echo "Processing image $$base with depth $$depth"; \
			$(MAKE) $${base}_16.bin; \
		fi \
	done

# Rule for 8-bit images
%_8.bin %_8.h: %.png
	@echo "Processing 8-bit image $<"
	@if [ "$$(magick identify -format '%k' $<)" -ne 256 ]; then \
		echo "  Quantizing to 256 colors..."; \
		magick $< -colors 256 -depth 8 -type Palette $(GENERATED)/$*_8.temp.png; \
	else \
		echo "  Already quantized, using as-is..."; \
		cp $< $(GENERATED)/$*_8.temp.png; \
	fi
	@grit $(GENERATED)/$*_8.temp.png -gb -gB8 -p -ftb -o $(GENERATED)/$*_8
	@rm $(GENERATED)/$*_8.temp.png

# Rule for 16-bit images
%_16.bin %_16.h: %.png
	@echo "Processing 16-bit image $<"
	@grit $< -gb -gB16 -ftb -o $(GENERATED)/$*_16

#---------------------------------------------------------------------------------
else

#---------------------------------------------------------------------------------
# main targets
#---------------------------------------------------------------------------------

$(OUTPUT).gba	:	$(OUTPUT).elf

$(OUTPUT).elf	:	$(OFILES)

$(OFILES_SOURCES) : $(HFILES)

#---------------------------------------------------------------------------------
# The bin2o rule should be copied and modified
# for each extension used in the data directories
#---------------------------------------------------------------------------------

#---------------------------------------------------------------------------------
# rule to build soundbank from music files
#---------------------------------------------------------------------------------
soundbank.bin soundbank.h : $(MODFILES) $(SFXFILES)
#---------------------------------------------------------------------------------
	@echo "Generating soundbank..."
	@mmutil $^ -osoundbank.bin -hsoundbank.h

#---------------------------------------------------------------------------------
# This rule links in binary data with the .bin extension
#---------------------------------------------------------------------------------
%.bin.o	%_bin.h :	%.bin
#---------------------------------------------------------------------------------
	@echo $(notdir $<)
	@$(bin2o)


-include $(DEPSDIR)/*.d
#---------------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------------