PROJECT := ortools
BUILD_SYSTEM := bazel
BRANCH := $(shell git rev-parse --abbrev-ref HEAD)
SHA1 := $(shell git rev-parse --verify HEAD)

# General commands
.PHONY: help
BOLD=\e[1m
RESET=\e[0m

help:
	@echo -e "${BOLD}SYNOPSIS${RESET}"
	@echo -e "\tmake <target> [NOCACHE=1]"
	@echo
	@echo -e "${BOLD}DESCRIPTION${RESET}"
	@echo -e "\ttest build inside docker container to have a reproductible build."
	@echo
	@echo -e "${BOLD}MAKE TARGETS${RESET}"
	@echo -e "\t${BOLD}help${RESET}: display this help and exit."
	@echo
	@echo -e "\t${BOLD}<stage>${RESET}: build all <stage> docker images."
	@echo -e "\t${BOLD}<distro>_<stage>${RESET}: build the <stage> docker image for a specific distro."
	@echo -e "\t${BOLD}save_<stage>${RESET}: Save all <stage> docker images."
	@echo -e "\t${BOLD}save_<distro>_<stage>${RESET}: Save the <stage> docker image for a specific distro."
	@echo -e "\t${BOLD}sh_<distro>_<stage>${RESET}: run a container using the <stage> docker image (debug purpose)."
	@echo
	@echo -e "\t${BOLD}<stage>${RESET}:"
	@echo -e "\t\t${BOLD}env${RESET}"
	@echo -e "\t\t${BOLD}devel${RESET}"
	@echo -e "\t\t${BOLD}build${RESET}"
	@echo -e "\t\t${BOLD}test${RESET}"
	@echo
	@echo -e "\t${BOLD}<distro>${RESET}:"
	@echo -e "\t\t${BOLD}alpine${RESET} (edge)"
	@echo -e "\t\t${BOLD}archlinux${RESET} (latest)"
	@echo -e "\t\t${BOLD}centos${RESET} (latest)"
	@echo -e "\t\t${BOLD}debian${RESET} (latest)"
	@echo -e "\t\t${BOLD}fedora${RESET} (latest)"
	@echo -e "\t\t${BOLD}opensuse${RESET} (tumbleweed)"
	@echo -e "\t\t${BOLD}ubuntu${RESET} (rolling)"
	@echo -e "\te.g. 'make ubuntu_test'"
	@echo
	@echo -e "\t${BOLD}clean${RESET}: Remove cache and ALL docker images."
	@echo -e "\t${BOLD}clean_<distro>${RESET}: Remove cache and docker images for the specified distro."
	@echo
	@echo -e "\t${BOLD}NOCACHE=1${RESET}: use 'docker build --no-cache' when building container (default use cache)."
	@echo
	@echo -e "branch: $(BRANCH)"
	@echo -e "sha1: $(SHA1)"

# Need to add cmd_distro to PHONY otherwise target are ignored since they do not
# contain recipe (using FORCE do not work here)
.PHONY: all
all: build

# Delete all implicit rules to speed up makefile
MAKEFLAGS += --no-builtin-rules
.SUFFIXES:
# Remove some rules from gmake that .SUFFIXES does not remove.
SUFFIXES =
# Keep all intermediate files
# ToDo: try to remove it later
.SECONDARY:

# Docker image name prefix.
IMAGE := ${PROJECT}/${BUILD_SYSTEM}

ifdef NOCACHE
DOCKER_BUILD_CMD := docker build --no-cache
else
DOCKER_BUILD_CMD := docker build
endif

DOCKER_RUN_CMD := docker run --rm --init --net=host

# Currently supported distro
DISTROS = alpine archlinux centos debian fedora opensuse ubuntu

# $* stem
# $< first prerequist
# $@ target name

STAGES = env devel build test
define make-stage-target =
#$$(info STAGE: $1)
.PHONY: $1
#$$(info Create targets: $1 $(addsuffix _$1, $(DISTROS)).)
targets_$1 = $(addsuffix _$1, $(DISTROS))
.PHONY: $(targets_$1)
$1: $$(targets_$1)
$$(targets_$1): %_$1: docker/%/Dockerfile
	#@docker image rm -f ${IMAGE}:$$*_$1 2>/dev/null
	${DOCKER_BUILD_CMD} --target=$1 --tag ${IMAGE}:$$*_$1 -f $$< ..

#$$(info Create targets: save_$1 $(addprefix save_, $(addsuffix _$1, $(DISTROS))) (debug).)
save_targets_$1 = $(addprefix save_, $(addsuffix _$1, $(DISTROS)))
.PHONY: save_$1 $(save_targets_$1)
save_$1: $$(save_targets_$1)
$$(save_targets_$1): save_%_$1: cache/%/docker_$1.tar
cache/%/docker_$1.tar: %_$1
	@rm -f $$@
	mkdir -p cache/$$*
	docker save ${IMAGE}:$$*_$1 -o $$@

#$$(info Create targets: $(addprefix sh_, $(addsuffix _$1, $(DISTROS))) (debug).)
sh_targets_$1 = $(addprefix sh_, $(addsuffix _$1, $(DISTROS)))
.PHONY: $(sh_targets_$1)
$$(sh_targets_$1): sh_%_$1: %_$1
	${DOCKER_RUN_CMD} -it --name ${PROJECT}_${BUILD_SYSTEM}_$$*_$1 ${IMAGE}:$$*_$1

#$$(info Create targets: $(addprefix clean_, $(addsuffix _$1, $(DISTROS))).)
clean_targets_$1 = $(addprefix clean_, $(addsuffix _$1, $(DISTROS)))
.PHONY: clean_$1 $(clean_targets_$1)
clean_$1: $$(clean_targets_$1)
$$(clean_targets_$1): clean_%_$1:
	docker image rm -f ${IMAGE}:$$*_$1 2>/dev/null
	rm -f cache/$$*/docker_$1.tar
endef

$(foreach stage,$(STAGES),$(eval $(call make-stage-target,$(stage))))

## CLEAN ##
clean_targets = $(addprefix clean_, $(DISTROS))
.PHONY: clean $(clean_targets)
clean: $(clean_targets)
	docker container prune -f
	docker image prune -f
	-rmdir cache
$(clean_targets): clean_%: $(addprefix clean_%_, $(STAGES))
	-rmdir cache/$*

.PHONY: distclean
distclean: clean
	-docker container rm -f $$(docker container ls -aq)
	-docker image rm -f $$(docker image ls -aq)