CC = clang

SRC_DIR := src
SRC := $(SRC_DIR)/main.c

BUILD_DIR := build

ASSETS := assets
TARGET := $(BUILD_DIR)/hello

CTOOLS := $(SRC_DIR)/ctools
LIBFT_DIR := $(CTOOLS)/libft
LIBFT := $(LIBFT_DIR)/lib/libft.a

LIB := $(LIBFT)

TOOLCHAIN_DIR := $(HOME)/.local/toolchains
TOOLCHAIN := $(TOOLCHAIN_DIR)/aarch64-linux-musl-cross
TOOLCHAIN_BIN := $(TOOLCHAIN)/bin
MUSL_LD := $(TOOLCHAIN_BIN)/aarch64-linux-musl-ld

CFLAGS := -Wall -Wextra -Werror --target=aarch64-linux-musl \
		  --sysroot=$(TOOLCHAIN) \
		  --ld-path=$(MUSL_LD)

DOCKER_CMD := /bin/sh #-c 'hello "host.docker.internal" "8000"'

MINIROOTFS := $(ASSETS)/minirootfs.tar.gz

ALPINE := alpine
ALPINE_KERNEL := alpine/boot/vmlinuz-rpi
ALPINE_INITFRAM_FS := alpine/boot/initramfs-rpi
ALPINE_BIN := $(ALPINE)/bin
ALPINE_TAR := $(ASSETS)/alpine-rpi-aarch64.gz
ALPINE_HEADLESS := $(ASSETS)/headless.apkovl.tar.gz

ALPINE_CUSTOM_IMG := $(BUILD_DIR)/alpine-custom.img

PLATFORM := arm64
QEMU_VM := qemu-system-aarch64
QEMU_IMG := qemu-img

all: $(TARGET)

$(TARGET): $(TOOLCHAIN) $(SRC) $(BUILD_DIR) $(LIB)
	echo $(HOME)
	$(CC) $(CFLAGS) -o $(TARGET) $(SRC) $(LIB)

get: $(ASSETS) $(ALPINE) $(ALPINE_TAR) $(ALPINE_HEADLESS)
	rm -rf $(ALPINE)/*
	tar xvf $(ALPINE_TAR) -C $(ALPINE)

qemu: $(ALPINE_CUSTOM_IMG) img
	$(QEMU_VM) -M virt -cpu cortex-a72 -smp 2 -m 1G \
		-kernel $(ALPINE_KERNEL) \
		-initrd $(ALPINE_INITFRAM_FS) \
		-append "console=ttyAMA0 root=/dev/vda rw" \
		-drive format=raw,file=fat:rw:$(ALPINE)/ \
		-nographic \
		-virtfs local,path=$(BUILD_DIR),mount_tag=$(BUILD_DIR),security_model=none

img: $(ALPINE) get
	$(QEMU_IMG) create -f raw $(ALPINE_CUSTOM_IMG) 512M
	mformat -i $(ALPINE_CUSTOM_IMG) -F ::
	mcopy -i $(ALPINE_CUSTOM_IMG) -s $(ALPINE)/* ::

bootable: $(ALPINE) get
	tar czf $(MINIROOTFS) -C $(ALPINE) ./

$(ALPINE_HEADLESS):
	wget https://github.com/macmpi/alpine-linux-headless-bootstrap/raw/98728731299f262eab270941c522138d6c5cea73/headless.apkovl.tar.gz -O $(ALPINE_HEADLESS)

$(TOOLCHAIN): | $(TOOLCHAIN_DIR)
	wget https://musl.cc/aarch64-linux-musl-cross.tgz
	tar xvf aarch64-linux-musl-cross.tgz -C $(TOOLCHAIN_DIR)
	rm aarch64-linux-musl-cross.tgz

$(TOOLCHAIN_DIR):
	mkdir -p $@

$(ALPINE_TAR):
	wget https://dl-cdn.alpinelinux.org/alpine/v3.22/releases/aarch64/alpine-rpi-3.22.1-aarch64.tar.gz -O $(ALPINE_TAR)

$(LIB):
	make aarch64 -C $(LIBFT_DIR)

$(BUILD_DIR):
	mkdir -p $@

$(ALPINE):
	mkdir -p $@

$(ASSETS):
	mkdir -p $@

clean:
	rm -rf $(BUILD_DIR) $(ALPINE) $(ASSETS)
	make fclean -C $(LIBFT_DIR)