# Copyright 2010-2025 Google LLC
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

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 "\tBuild using docker and the host platform."
	@echo -e "\t${BOLD}<distro>_<stage>${RESET}: build a <stage> docker image for a specific distro."
	@echo -e "\t${BOLD}save_<distro>_<stage>${RESET}: Save a <stage> docker image for a specific distro."
	@echo -e "\t${BOLD}sh_<distro>_<stage>${RESET}: run a container using the <stage> docker image specified (debug purpose)."
	@echo -e "\t${BOLD}clean_<distro>_<stage>${RESET}: Remove cache and docker image."
	@echo -e "\t${BOLD}clean_native${RESET}: Remove ALL caches and docker images."
	@echo
	@echo -e "\tWith ${BOLD}<distro>${RESET}:"
	@echo -e "\t\t${BOLD}almalinux${RESET} (latest)"
	@echo -e "\t\t${BOLD}alpine${RESET} (edge)"
	@echo -e "\t\t${BOLD}archlinux${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${BOLD}rockylinux${RESET} (9)"
	@echo -e "\t\t${BOLD}ubuntu${RESET} (rolling)"
	@echo -e "\t\t${BOLD}all${RESET} trigger ALL DISTROS."
	@echo
	@echo -e "\tWith ${BOLD}<stage>${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 -e "\te.g. 'make ubuntu_test'"
	@echo
	@echo -e "\tBuild using docker buildx with a platform specified."
	@echo -e "\t${BOLD}<platform>_<stage>${RESET}: build <stage> docker images for ALL DISTROS."
	@echo -e "\t${BOLD}<platform>_<distro>_<stage>${RESET}: build <stage> docker image for a specific distro."
	@echo -e "\t${BOLD}save_<platform>_<stage>${RESET}: Save <stage> docker images for ALL DISTROS."
	@echo -e "\t${BOLD}save_<platform>_<distro>_<stage>${RESET}: Save the <stage> docker image for a specific distro."
	@echo -e "\t${BOLD}sh_<platform>_<distro>_<stage>${RESET}: run a container using the <stage> docker image specified (debug purpose)."
	@echo -e "\t${BOLD}clean_<platform>_<distro>_<stage>${RESET}: Remove cache and docker image."
	@echo -e "\t${BOLD}clean_platforms${RESET}: Remove ALL cache and docker image."
	@echo
	@echo -e "\tWith ${BOLD}<platform>${RESET}:"
	@echo -e "\t\t${BOLD}amd64${RESET}: linux/amd64 (x86_64)"
	@echo -e "\t\t${BOLD}arm64${RESET}: linux/arm64 (aarch64, arm64v8)"
	@echo -e "\t\t${BOLD}mips64${RESET}: linux/mips64 (mips 64bits)"
	@echo -e "\t\t${BOLD}mips64le${RESET}: linux/mips64le (mips 64bits Little Endian)"
	@echo -e "\t\t${BOLD}ppc64${RESET}: linux/ppc64 (PowerPC 64Bits)"
	@echo -e "\t\t${BOLD}ppc64le${RESET}: linux/ppc64le (PowerPC 64Bits Little Endian)"
	@echo -e "\t\t${BOLD}riscv64${RESET}: linux/riscv64 (RISC-V 64bits)"
	@echo -e "\te.g. 'make amd64_ubuntu_test'"
	@echo -e "\tDocker image unavailable: arm64_archlinux"
	@echo
	@echo -e "\tGlobal targets."
	@echo -e "\t${BOLD}clean${RESET}: Remove ALL caches and docker images."
	@echo -e "\t${BOLD}distclean${RESET}: Remove everything."
	@echo
	@echo -e "\t${BOLD}NOCACHE=1${RESET}: use 'docker build --no-cache' when building container (default use cache)."
	@echo -e "\t${BOLD}VERBOSE=1${RESET}: use 'docker build --progress=plain' when building container."
	@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: all_test

# 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}

DOCKER_BUILD_CMD := docker build
DOCKER_BUILDX_CMD := docker buildx build
ifdef NOCACHE
DOCKER_BUILD_CMD := ${DOCKER_BUILD_CMD} --no-cache
DOCKER_BUILDX_CMD := ${DOCKER_BUILDX_CMD} --no-cache
endif
ifdef VERBOSE
DOCKER_BUILD_CMD := ${DOCKER_BUILD_CMD} --progress=plain
DOCKER_BUILDX_CMD := ${DOCKER_BUILDX_CMD} --progress=plain
endif
DOCKER_RUN_CMD := docker run --rm --init --net=host

# Currently supported distro
DISTROS := \
 almalinux \
 alpine \
 archlinux \
 debian \
 fedora \
 opensuse \
 rockylinux \
 ubuntu

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

############
## STAGES ##
############
STAGES := env devel build test

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

#$$(info Create targets: save_all_$1 $(addprefix save_, $(addsuffix _$1, $(DISTROS))) (debug).)
save_targets_$1 = $(addprefix save_, $(addsuffix _$1, $(DISTROS)))
.PHONY: save_all_$1 $$(save_targets_$1)
save_all_$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

#$$(info Create targets: clean_all_$1 $(addprefix clean_, $(addsuffix _$1, $(DISTROS))).)
clean_targets_$1 = $(addprefix clean_, $(addsuffix _$1, $(DISTROS)))
.PHONY: clean_all_$1 $$(clean_targets_$1)
clean_all_$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))))

## MERGE ##
.PHONY: clean_all
clean_all: $(addprefix clean_all_, $(STAGES))
	rm -f $(addprefix cache/, $(DISTROS))

##############
## PLATFORM ##
##############
# ref: https://go.dev/doc/install/source#environment
# ref: https://github.com/containerd/containerd/blob/269548fa27e0089a8b8278fc4fc781d7f65a939b/platforms/platforms.go#L80-L94
PLATFORMS := \
 amd64 \
 arm64 \
 mips64 mips64le \
 ppc64 ppc64le \
 riscv64

define make-platform-stage-target =
#$$(info PLATFORM: '$1' STAGE: '$2')
#$$(info Create targets: $1_all_$2 $(addprefix $1_, $(addsuffix _$2, $(DISTROS))).)
targets_$1_$2 = $(addprefix $1_, $(addsuffix _$2, $(DISTROS)))
.PHONY: $1_all_$2 $$(targets_$1_$2)
$1_all_$2: $$(targets_$1_$2)
$$(targets_$1_$2): $1_%_$2: docker/%/Dockerfile
	#@docker image rm -f ${IMAGE}:$1_$$*_$2 2>/dev/null
	${DOCKER_BUILDX_CMD} --platform linux/$1 --target=$2 --tag ${IMAGE}:$1_$$*_$2 -f $$< ..

#$$(info Create targets: save_$1_all_$2 $(addprefix save_$1_, $(addsuffix _$2, $(DISTROS))) (debug).)
save_targets_$1_$2 = $(addprefix save_$1_, $(addsuffix _$2, $(DISTROS)))
.PHONY: save_$1_all_$2 $$(save_targets_$1_$2)
save_$1_all_$2: $$(save_targets_$1_$2)
$$(save_targets_$1_$2): save_$1_%_$2: cache/$1/%/docker_$2.tar
cache/$1/%/docker_$2.tar: $1_%_$2
	@rm -f $$@
	mkdir -p cache/$1/$$*
	docker save ${IMAGE}:$1_$$*_$2 -o $$@

#$$(info Create targets: $(addprefix sh_$1_, $(addsuffix _$2, $(DISTROS))) (debug).)
sh_targets_$1_$2 = $(addprefix sh_$1_, $(addsuffix _$2, $(DISTROS)))
.PHONY: $$(sh_targets_$1_$2)
$$(sh_targets_$1_$2): sh_$1_%_$2: $1_%_$2
	${DOCKER_RUN_CMD} --platform linux/$1 -it --name ${PROJECT}_${BUILD_SYSTEM}_$1_$$*_$2 ${IMAGE}:$1_$$*_$2

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

define make-platform-target =
#$$(info PLATFORM: $1)
$(foreach stage,$(STAGES),$(eval $(call make-platform-stage-target,$1,$(stage))))

# merge
.PHONY: clean_$1
clean_$1: $(addprefix clean_$1_all_, $(STAGES))
	-rmdir $(addprefix cache/$1/, $(DISTROS))
	-rmdir cache/$1
endef

$(foreach platform,$(PLATFORMS),$(eval $(call make-platform-target,$(platform))))

## MERGE ##
.PHONY: clean_platforms
clean_platforms: $(addprefix clean_, $(PLATFORMS))

###########
## CLEAN ##
###########
.PHONY: clean
clean: clean_all clean_platforms
	docker container prune -f
	docker image prune -f
	-rmdir cache

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