# Basic definitions
DOCKER_USERNAME := xddxdd
ARCHITECTURES := amd64 i386 arm32v7 arm64v8 ppc64le s390x riscv64 x32
IMAGES := frontend proxy

# General Purpose Preprocessor config
GPP_INCLUDE_DIR := include
GPP_FLAGS_U := "" "" "(" "," ")" "(" ")" "\#" ""
GPP_FLAGS_M := "\#" "\n" " " " " "\n" "(" ")"
GPP_FLAGS_EXTRA := +c "\\\n" ""
GPP_FLAGS := -I ${GPP_INCLUDE_DIR} --nostdinc -U ${GPP_FLAGS_U} -M ${GPP_FLAGS_M} ${GPP_FLAGS_EXTRA}

BUILD_ID ?= $(shell date +%Y%m%d%H%M)

# Function to create targets for image/architecture combos
define create-image-arch-target
$1/Dockerfile.$2: $1/template.Dockerfile
	@gpp ${GPP_FLAGS} -D ARCH_$(shell echo $2 | tr a-z A-Z) -o $1/Dockerfile.$2 $1/template.Dockerfile || rm -rf $1/Dockerfile.$2

$1/$2: $1/Dockerfile.$2
	@if [ -f $1/Dockerfile.$2 ]; then \
		docker build --pull --no-cache -t ${DOCKER_USERNAME}/$1:$2-${BUILD_ID} -f $1/Dockerfile.$2 $1 || exit 1; \
		docker push ${DOCKER_USERNAME}/$1:$2-${BUILD_ID} || exit 1; \
		docker tag ${DOCKER_USERNAME}/$1:$2-${BUILD_ID} ${DOCKER_USERNAME}/$1:$2 || exit 1; \
		docker push ${DOCKER_USERNAME}/$1:$2 || exit 1; \
	else \
		echo "Dockerfile generation failed, see error above"; \
		exit 1; \
	fi

endef

# Function to create targets for images
define create-image-target
$1:$(foreach arch,latest ${ARCHITECTURES},$1/${arch})

# Target for latest image, mapping to amd64
$1/latest: $1/amd64
	@docker tag ${DOCKER_USERNAME}/$1:amd64-${BUILD_ID} ${DOCKER_USERNAME}/$1:${BUILD_ID} || exit 1
	docker push ${DOCKER_USERNAME}/$1:${BUILD_ID} || exit 1
	@docker tag ${DOCKER_USERNAME}/$1:amd64-${BUILD_ID} ${DOCKER_USERNAME}/$1:latest || exit 1
	docker push ${DOCKER_USERNAME}/$1:latest || exit 1

$(foreach arch,${ARCHITECTURES},$(eval $(call create-image-arch-target,$1,$(arch))))
endef

# By default, build docker images, and do not delete intermediate files
.DEFAULT_GOAL := images
.DELETE_ON_ERROR:
.SECONDARY:

# Create all targets for image/architecture combos
$(foreach image,${IMAGES},$(eval $(call create-image-target,${image})))

# Target to enable multiarch support
_crossbuild:
	@docker run --rm --privileged multiarch/qemu-user-static --reset -p yes >/dev/null

dockerfiles: $(foreach image,${IMAGES},$(foreach arch,${ARCHITECTURES},$(image)/Dockerfile.$(arch)))

images: $(foreach image,${IMAGES},$(image))

clean:
	@rm -rf */Dockerfile.{$(shell echo ${ARCHITECTURES} | sed "s/ /,/g")}