O ?= .
IMAGESDIR ?= $(O)/images
CONFIGDIR ?= .

export CONFIGDIR

update.tar: $(IMAGESDIR)/update.tar.zstd

$(O)/.prepared: \
		prepare.sh \
		setup-local-repo.sh \
		$(shell find patches/ebuilds -type f)
	./prepare.sh
	./setup-local-repo.sh
	mkdir -p $(O)
	touch $(O)/.prepared

prepare: $(O)/.prepared

$(O)/.host-tools: \
		build-host-tools.sh \
		$(CONFIGDIR)/host-tools.packages \
		$(shell find $(CONFIGDIR)/portage/host -type f) \
		$(O)/.prepared
	./build-host-tools.sh
	touch $(O)/.host-tools

host-tools: $(O)/.host-tools

$(O)/.built: \
		build.sh \
		$(CONFIGDIR)/build.packages \
		$(CONFIGDIR)/install.packages \
		$(shell find $(CONFIGDIR)/portage/target -type f) \
		$(O)/.host-tools \
		$(O)/.prepared
	./build.sh
	touch $(O)/.built

$(O)/.ready: \
		build-rootfs.sh \
		$(CONFIGDIR)/install.packages \
		$(CONFIGDIR)/installonly.packages \
		$(CONFIGDIR)/busybox.symlinks \
		$(O)/linux/arch/arm64/boot/Image.gz \
		$(shell find overlay -type f) \
		$(shell find $(CONFIGDIR)/overlay -type f 2>/dev/null) \
		$(O)/.host-tools \
		$(O)/.built
	./build-rootfs.sh
	touch $(O)/.ready

$(IMAGESDIR)/rootfs.squashfs: \
		build-squashfs.sh \
		$(CONFIGDIR)/squashfs.exclude \
		$(O)/.ready
	./build-squashfs.sh "$(IMAGESDIR)"

squashfs: $(IMAGESDIR)/rootfs.squashfs

$(O)/linux/arch/arm64/boot/Image.gz: \
		build-kernel.sh \
		$(CONFIGDIR)/linux.config \
		$(O)/.host-tools \
		$(O)/.prepared
	./build-kernel.sh "$(O)"

kernel: $(O)/linux/arch/arm64/boot/Image.gz

$(O)/efi-part/EFI/BOOT/BOOTAA64.efi: \
		build-grub.sh \
		grub.cfg \
		$(O)/.host-tools \
		$(O)/.prepared
	./build-grub.sh "$(O)"

grub: $(O)/efi-part/EFI/BOOT/BOOTAA64.efi

$(IMAGESDIR)/sdcard.img: \
		genimage.cfg \
		genimage.sh \
		post-build.sh \
		$(O)/efi-part/EFI/BOOT/BOOTAA64.efi
	./post-build.sh "$(O)"
	./genimage.sh "$(O)" "$(IMAGESDIR)"

sdcard.img: $(IMAGESDIR)/sdcard.img

$(IMAGESDIR)/firmware.img: $(IMAGESDIR)/sdcard.img

$(IMAGESDIR)/update.tar.zstd: \
		$(IMAGESDIR)/rootfs.squashfs \
		$(IMAGESDIR)/firmware.img \
		install-update.sh \
		$(O)/.host-tools \
		$(O)/.prepared
	./build-update.sh "$(IMAGESDIR)"

clean:
	rm -rf $(O)/linux $(O)/output $(IMAGESDIR) $(O)/tmp
	rm -f $(O)/.prepared $(O)/.host-tools

.PHONY: \
	grub \
	host-tools \
	kernel \
	prepare \
	sdcard.img \
	squashfs \
	update.tar