PROJECT_ROOT = $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
ifeq ($(PROJECT_ROOT),$(CURDIR)/)
BUILD_DIR=build/
$(shell mkdir -p build)
else
BUILD_DIR=./
endif

OBJS = main.o game.o textbox.o inventory.o decompress_sprite.o
SPRITES = $(patsubst $(PROJECT_ROOT)sprites/%.xcf,%,$(wildcard $(PROJECT_ROOT)sprites/*.xcf))
NAVMESHES = $(patsubst $(PROJECT_ROOT)navmesh/%.tmx,%,$(wildcard $(PROJECT_ROOT)navmesh/*.tmx))

CFLAGS += -g

CXX := aarch64-linux-gnu-g++
CC := aarch64-linux-gnu-gcc
OBJCOPY := aarch64-linux-gnu-objcopy -O elf64-littleaarch64
CFLAGS += -I/usr/include

OBJS += $(patsubst %,sprite_%.o,$(SPRITES))
OBJS += $(patsubst %,navmesh_%.o,$(NAVMESHES))

EXE=$(BUILD_DIR)pt2game

# convert sprites to png so they can be included in tiled map files
all: $(EXE) $(patsubst %,$(BUILD_DIR)%.png,$(SPRITES))

$(EXE): $(patsubst %,$(BUILD_DIR)%,$(OBJS))
	$(CXX) $(LDFLAGS) -o $@ $^
	$(EXTRA_CMDS)

$(BUILD_DIR)%.o: $(PROJECT_ROOT)%.cpp
	$(CXX) -c $(CFLAGS) $(CXXFLAGS) $(CPPFLAGS) -o $@ $<

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

$(BUILD_DIR)%.o: $(BUILD_DIR)%.c
	$(CXX) -c $(CFLAGS) $(CXXFLAGS) $(CPPFLAGS) -o $@ $< -iquote "$(PROJECT_ROOT)"

clean:
	rm -fr $(BUILD_DIR)/$(EXE) $(patsubst %,$(BUILD_DIR)%,$(OBJS))

$(BUILD_DIR)sprite_%.o: $(BUILD_DIR)%.png $(PROJECT_ROOT)compress_sprite.py
	python3 "$(PROJECT_ROOT)compress_sprite.py" "$<" $(patsubst %.o,%.raw,$@)
	cd $(BUILD_DIR) && $(OBJCOPY) -I binary --rename-section .data=.rodata,alloc,load,readonly,data,contents $(patsubst %.o,%.raw,$(notdir $@)) $(notdir $@)
	rm $(patsubst %.o,%.raw,$@)
	@# symbols are _binary_sprite_%_raw_start / _end / _size

$(BUILD_DIR)navmesh_%.c: $(PROJECT_ROOT)navmesh/%.tmx $(PROJECT_ROOT)compile_navmesh.py
	python3 "$(PROJECT_ROOT)compile_navmesh.py" "$<" "$@" "$(patsubst $(BUILD_DIR)navmesh_%.c,%,$@)"
	@# symbols are navmesh_% and predef_%

$(BUILD_DIR)navmesh_%.o: $(PROJECT_ROOT)compiled_structures.h $(PROJECT_ROOT)objids.h
$(BUILD_DIR)main.o: $(PROJECT_ROOT)engine.h

$(BUILD_DIR)%.png: $(PROJECT_ROOT)sprites/%.xcf
	gimp -in -b '(let ((image (car (gimp-xcf-load 0 "$<" "$(notdir $<)")))) ;\
		;(gimp-image-scale image 1280 800) ;\
		(let ((layer (car (gimp-image-merge-visible-layers image CLIP-TO-IMAGE)))) ;\
			(file-png-save 1 image layer "$@" "$(notdir $@)" 0 9 0 0 0 0 0) ;\
		) ;\
	)' -b '(gimp-quit 0)'