ROMS := pokegold-spaceworld.gb \
        pokesilver-spaceworld.gb \
        pokegold-spaceworld-debug.gb \
        pokesilver-spaceworld-debug.gb
CORRECTEDROMS := $(ROMS:%.gb=%-correctheader.gb)

ROM_OBJ := \
	audio.o \
	home.o \
	main.o \
	maps.o \
	ram.o \
	overdump/overdump.o \
	gfx/misc.o \
	gfx/pics.o \
	gfx/sprites.o \
	gfx/tilesets.o

pokegold-spaceworld_obj         := $(ROM_OBJ:.o=_gold.o)
pokegold-spaceworld-debug_obj   := $(ROM_OBJ:.o=_gold_debug.o)
pokesilver-spaceworld_obj       := $(ROM_OBJ:.o=_silver.o)
pokesilver-spaceworld-debug_obj := $(ROM_OBJ:.o=_silver_debug.o)


### Build tools

ifeq (,$(shell which sha1sum))
SHA1 := shasum
else
SHA1 := sha1sum
endif

RGBDS ?=
RGBASM  ?= $(RGBDS)rgbasm
RGBFIX  ?= $(RGBDS)rgbfix
RGBGFX  ?= $(RGBDS)rgbgfx
RGBLINK ?= $(RGBDS)rgblink

RGBASMFLAGS  ?= -Weverything -Wtruncation=1
RGBLINKFLAGS ?= -Weverything -Wtruncation=1
RGBFIXFLAGS  ?= -Weverything
RGBGFXFLAGS  ?= -Weverything

tools/gfx :=


### Build targets

.SUFFIXES:
.SECONDEXPANSION:
.PRECIOUS:
.SECONDARY:
.PHONY: \
	all \
	gold \
	silver \
	gold_debug \
	silver_debug \
	tools \
	clean \
	tidy \
	compare

all: $(ROMS) $(CORRECTEDROMS) compare
gold:         pokegold-spaceworld.gb pokegold-spaceworld-correctheader.gb
silver:       pokesilver-spaceworld.gb pokesilver-spaceworld-correctheader.gb
gold_debug:   pokegold-spaceworld-debug.gb pokegold-spaceworld-debug-correctheader.gb
silver_debug: pokesilver-spaceworld-debug.gb pokesilver-spaceworld-debug-correctheader.gb

compare: $(ROMS) $(CORRECTEDROMS)
	@$(SHA1) -c roms.sha1

tools:
	$(MAKE) -C tools/

# Remove files generated by the build process.
clean: tidy
	find gfx overdump \
	     \( -iname "*.[12]bpp" \
	        -o -iname "*.pic" \
	        -o -iname "*.sgb.tilemap" \) \
	     -delete

# Remove generated files except for graphics.
tidy:
	$(RM) $(ROMS) $(CORRECTEDROMS) \
	      $(ROMS:.gb=.sym) $(CORRECTEDROMS:.gb=.sym) \
	      $(ROMS:.gb=.map) $(CORRECTEDROMS:.gb=.map) \
	      $(pokegold-spaceworld_obj) \
	      $(pokesilver-spaceworld_obj) \
	      $(pokegold-spaceworld-debug_obj) \
	      $(pokesilver-spaceworld-debug_obj) \
	      rgbdscheck.o
	$(MAKE) clean -C tools/


RGBASMFLAGS += -Q8 -P includes.asm
# Create a sym/map for debug purposes if `make` run with `DEBUG=1`
ifeq ($(DEBUG),1)
RGBASMFLAGS += -E
endif

$(pokegold-spaceworld_obj):         RGBASMFLAGS += -D _GOLD
$(pokesilver-spaceworld_obj):       RGBASMFLAGS += -D _SILVER
$(pokegold-spaceworld-debug_obj):   RGBASMFLAGS += -D _GOLD -D _DEBUG
$(pokesilver-spaceworld-debug_obj): RGBASMFLAGS += -D _SILVER -D _DEBUG

rgbdscheck.o: rgbdscheck.asm
	$(RGBASM) -o $@ $<

# Build tools when building the rom.
# This has to happen before the rules are processed, since that's when scan_includes is run.
ifeq (,$(filter clean tidy tools,$(MAKECMDGOALS)))

$(info $(shell $(MAKE) -C tools))

# The dep rules have to be explicit or else missing files won't be reported.
# As a side effect, they're evaluated immediately instead of when the rule is invoked.
# It doesn't look like $(shell) can be deferred so there might not be a better way.
preinclude_deps := includes.asm $(shell tools/scan_includes includes.asm)
define DEP
$1: $2 $$(shell tools/scan_includes $2) $(preinclude_deps) | rgbdscheck.o
	$$(RGBASM) $$(RGBASMFLAGS) -o $$@ $$<
endef

# Dependencies for objects (drop _gold and _silver from asm file basenames)
$(foreach obj, $(pokegold-spaceworld_obj), $(eval $(call DEP,$(obj),$(obj:_gold.o=.asm))))
$(foreach obj, $(pokesilver-spaceworld_obj), $(eval $(call DEP,$(obj),$(obj:_silver.o=.asm))))
$(foreach obj, $(pokegold-spaceworld-debug_obj), $(eval $(call DEP,$(obj),$(obj:_gold_debug.o=.asm))))
$(foreach obj, $(pokesilver-spaceworld-debug_obj), $(eval $(call DEP,$(obj),$(obj:_silver_debug.o=.asm))))

endif


### Build products

%-correctheader.gb: RGBFIXCFLAGS = -f hg -m MBC3+TIMER+RAM+BATTERY -Wno-overwrite
%-correctheader.gb: %.gb
	cp $< $@
	cp $(<:.gb=.sym) $(@:.gb=.sym)
	cp $(<:.gb=.map) $(@:.gb=.map)
	$(RGBFIX) $(RGBFIXFLAGS) $(RGBFIXCFLAGS) $@

RGBLINKFLAGS += -d
RGBFIXFLAGS += -sf lh -k 01 -l 0x33 -m MBC1+RAM+BATTERY -r 3 -p 0xff

pokegold%.gb:   RGBFIXFLAGS += -t POKEMON2GOLD
pokesilver%.gb: RGBFIXFLAGS += -t POKEMON2SILVER

%.gb: $$(%_obj) layout.link
	$(RGBLINK) $(RGBLINKFLAGS) -l layout.link -m $*.map -n $*.sym -o $@ $(filter %.o,$^)
	$(RGBFIX) $(RGBFIXFLAGS) $@


### Misc file-specific graphics rules

gfx/trainer_card/leaders.2bpp: tools/gfx += --trim-whitespace

gfx/minigames/slots_1.2bpp: tools/gfx += --trim-whitespace
gfx/minigames/slots_2.2bpp: tools/gfx += --interleave --png=$<
gfx/minigames/slots_3.2bpp: tools/gfx += --interleave --png=$< --remove-duplicates --keep-whitespace --remove-xflip
gfx/minigames/slots_4.2bpp: tools/gfx += --interleave --png=$<
gfx/minigames/poker.2bpp: tools/gfx += --trim-whitespace
gfx/minigames/picross_numbers.2bpp: tools/gfx += --trim-whitespace

gfx/intro/jigglypuff_pikachu.2bpp: tools/gfx += --trim-whitespace

gfx/battle_anims/attack_animations_1.2bpp: tools/gfx += --trim-whitespace
gfx/battle_anims/attack_animations_2.2bpp: tools/gfx += --trim-whitespace

gfx/title/title_logo.2bpp: tools/gfx += --trim-whitespace

gfx/battle_anims/angels.2bpp: tools/gfx += --trim-whitespace
gfx/battle_anims/beam.2bpp: tools/gfx += --remove-xflip --remove-yflip --remove-whitespace
gfx/battle_anims/bubble.2bpp: tools/gfx += --trim-whitespace
gfx/battle_anims/charge.2bpp: tools/gfx += --trim-whitespace
gfx/battle_anims/egg.2bpp: tools/gfx += --remove-whitespace
gfx/battle_anims/explosion.2bpp: tools/gfx += --remove-whitespace
gfx/battle_anims/hit.2bpp: tools/gfx += --remove-whitespace
gfx/battle_anims/horn.2bpp: tools/gfx += --remove-whitespace
gfx/battle_anims/lightning.2bpp: tools/gfx += --remove-whitespace
gfx/battle_anims/misc.2bpp: tools/gfx += --remove-duplicates --remove-xflip
gfx/battle_anims/noise.2bpp: tools/gfx += --remove-whitespace
gfx/battle_anims/objects.2bpp: tools/gfx += --remove-whitespace --remove-xflip
gfx/battle_anims/pokeball.2bpp: tools/gfx += --remove-xflip --keep-whitespace
gfx/battle_anims/reflect.2bpp: tools/gfx += --remove-whitespace
gfx/battle_anims/rocks.2bpp: tools/gfx += --remove-whitespace
gfx/battle_anims/skyattack.2bpp: tools/gfx += --remove-whitespace
gfx/battle_anims/status.2bpp: tools/gfx += --remove-whitespace

gfx/evo/bubbles.2bpp: tools/gfx += --remove-xflip --remove-yflip --remove-whitespace

gfx/trade/game_boy.2bpp: tools/gfx += --remove-duplicates --preserve=0x23,0x27

gfx/sgb/sgb_border_alt.2bpp: tools/gfx += --trim-whitespace
gfx/sgb/sgb_border_gold.2bpp: tools/gfx += --trim-whitespace
gfx/sgb/sgb_border_silver.2bpp: tools/gfx += --trim-whitespace
gfx/sgb/sgb_border_silver.2bpp: tools/gfx += --trim-whitespace

gfx/sgb/%.sgb.tilemap: gfx/sgb/%.bin ; LC_ALL=C tr < $< -d '\000' > $@


### Catch-all graphics rules

%.2bpp: %.png
	$(RGBGFX) --colors dmg $(RGBGFXFLAGS) -o $@ $<
	$(if $(tools/gfx),\
		tools/gfx $(tools/gfx) -o $@ $@ || $$($(RM) $@ && false))

%.1bpp: %.png
	$(RGBGFX) --colors dmg $(RGBGFXFLAGS) --depth 1 -o $@ $<
	$(if $(tools/gfx),\
		tools/gfx $(tools/gfx) --depth 1 -o $@ $@ || $$($(RM) $@ && false))

%.pic: %.2bpp
	tools/pkmncompress $< $@


### File extensions that are never generated and should be manually created

%.asm: ;
%.inc: ;
%.png: ;
%.pal: ;
%.bin: ;
%.blk: ;
%.rle: ;
