CC      := i686-elf-gcc
AS      := nasm
QEMU    := qemu-system-x86_64
LIMINE  ?= /opt/homebrew/share/limine

CFLAGS  := -std=c11 -ffreestanding -O0 -g -Wall -Wextra -Iinclude -MMD -MP
ASFLAGS := -felf32
LDFLAGS := -T linker.ld -ffreestanding -O0 -nostdlib
LDLIBS  := -lgcc

BUILD := build
OBJ   := $(BUILD)/obj
ISO   := $(BUILD)/iso
BIN   := $(BUILD)/macaroni.bin
IMAGE := $(BUILD)/macaroni.iso

SRCS := $(shell find src -name '*.c' -o -name '*.asm')
OBJS := $(SRCS:src/%=$(OBJ)/%.o)

LIMINE_FILES := limine-bios-cd.bin limine-bios.sys limine-uefi-cd.bin

.PHONY: all bin demo clean
all: $(IMAGE)
bin: $(BIN)

demo: $(IMAGE)
	$(QEMU) -chardev file,id=char0,path=/tmp/serial.log,signal=off -serial chardev:char0 -cdrom $<

clean:
	rm -rf $(OBJ) $(ISO) $(BIN) $(IMAGE)

$(OBJ)/%.c.o: src/%.c
	@mkdir -p $(@D)
	$(CC) $(CFLAGS) -c $< -o $@

$(OBJ)/%.asm.o: src/%.asm
	@mkdir -p $(@D)
	$(AS) $(ASFLAGS) $< -o $@

$(BIN): $(OBJS) linker.ld
	$(CC) $(LDFLAGS) $(OBJS) -o $@ $(LDLIBS)

$(ISO)/limine.conf:
	@mkdir -p $(@D)
	printf 'timeout: 0\n/macaroni\n    protocol: multiboot1\n    kernel_path: boot():/macaroni.bin\n' > $@

$(IMAGE): $(BIN) $(ISO)/limine.conf
	cp $(BIN) $(addprefix $(LIMINE)/,$(LIMINE_FILES)) $(ISO)/
	xorriso -as mkisofs -R -r -J -b limine-bios-cd.bin -no-emul-boot \
		-boot-load-size 4 -boot-info-table --efi-boot limine-uefi-cd.bin \
		-efi-boot-part --efi-boot-image --protective-msdos-label \
		$(ISO) -o $@
	limine bios-install $@

-include $(OBJS:.o=.d)