#########
# CONFIGS

CONF_WILDC:=$(wildcard $(PWD)/*.conf)
CONF_SOURCE:=$(patsubst %,. %;,$(CONF_WILDC))

# extraction of env variables from *.conf files
confvalue=$(shell $(CONF_SOURCE) echo -n $${$(1)})

# docker network name
CONF_DOCKERNET:=$(call confvalue,DOCKERNET)
ifeq ($(CONF_DOCKERNET),)
$(error DOCKERNET not set in $(CONF_WILDC))
endif

CONF_DOCKERCIDR:=$(call confvalue,DOCKERCIDR)
ifeq ($(CONF_DOCKERNET),)
$(error DOCKERCIDR not set in $(CONF_WILDC))
endif

# persistent data directory
CONF_TARGETROOT:=$(call confvalue,TARGETROOT)
ifeq ($(CONF_TARGETROOT),)
$(error TARGETROOT not set in $(CONF_WILDC))
endif

# suffix for project directories
PROJ_SUFFX:=$(call confvalue,SUFFIX_PROJECT)
ifeq ($(PROJ_SUFFX),)
$(error SUFFIX_PROJECT not set in $(CONF_WILDC))
endif

# suffix for disabled project directories
DOWN_SUFFX:=$(call confvalue,SUFFIX_DOWN)
ifeq ($(DOWN_SUFFX),)
$(error SUFFIX_DOWN not set in $(CONF_WILDC))
endif

#########
# CONSTANTS

# file to store docker network cidr
FILE_DOCKERNET:=$(CONF_TARGETROOT)/up-$(CONF_DOCKERNET)

# project directory handling
PROJ_WILDC:=$(wildcard *$(PROJ_SUFFX))
PROJ_NAMES:=$(basename $(PROJ_WILDC))

#########
# FUNCTIONS

# different complexities of commands with root privileges
# - in project directory
projsudo=cd "$<"; sudo bash -c "$(1)"
# - additionally with sourced *.conf files
confprojsudo=$(call projsudo,$(CONF_SOURCE) $(1))
# - only for compose: additionally with COMPOSE_PROJECT_NAME, CONFDIR and TARGETDIR set
sudocompose=$(call confprojsudo,COMPOSE_PROJECT_NAME="$(basename $<)" CONFDIR="$(CONF_TARGETROOT)/conf" TARGETDIR="$(CONF_TARGETROOT)/$<" docker-compose $(1))

#########
# TARGETS

# default target
.PHONY: all
all: purge-conf up

#########
# manage the docker network (container name local DNS)
$(FILE_DOCKERNET):
	sudo docker network create --driver bridge --internal --subnet "$(CONF_DOCKERCIDR)" "$(CONF_DOCKERNET)" ||:
	sudo mkdir -p "$(CONF_TARGETROOT)"
	sudo chmod 700 "$(CONF_TARGETROOT)"
	sudo echo "$(CONF_DOCKERCIDR)" | sudo tee "$@"

.PHONY: net-up
net-up: $(FILE_DOCKERNET)

.PHONY: net-down
net-down: down
	sudo docker network rm "$(CONF_DOCKERNET)"
	sudo rm "$(FILE_DOCKERNET)"

#########
# sync project config directory to variable folder
.PHONY: %-copyconf
%-copyconf: %$(PROJ_SUFFX)
	@if [ -d "$</conf" ]; then \
	  sudo rsync -r "$</conf" "$(CONF_TARGETROOT)"; \
	  echo "Synced '$</conf' to '$(CONF_TARGETROOT)'"; \
	fi

.PHONY: purge-conf
purge-conf:
	sudo rm -rf "$(CONF_TARGETROOT)/conf"

#########
# manage all projects
.PHONY: up down update
up: net-up $(patsubst %,%-copyconf,$(PROJ_NAMES)) $(patsubst %,%-up,$(PROJ_NAMES))
down: $(patsubst %,%-down,$(PROJ_NAMES))
update: $(patsubst %,%-update,$(PROJ_NAMES))

#########
# manage single project
.PHONY: %-up
%-up: %$(PROJ_SUFFX)
	$(call sudocompose,up -d $(x))

.PHONY: %-down
ifeq ($(x),)
%-down: %$(PROJ_SUFFX)
	$(call sudocompose,down)
else
%-down: %$(PROJ_SUFFX)
	$(call sudocompose,stop $(x))
	$(call sudocompose,rm -f $(x))
endif

.PHONY: %-pull
%-pull: %$(PROJ_SUFFX)
	$(call sudocompose,pull $(x))

.PHONY: %-build
%-build: %$(PROJ_SUFFX)
	$(call sudocompose,build --pull $(x))

.PHONY: %-logs
%-logs: %$(PROJ_SUFFX)
	$(call sudocompose,logs -t $(x)) 2>/dev/null | less -R +G

.PHONY: %-logf
%-logf: %$(PROJ_SUFFX)
	$(call sudocompose,logs -tf --tail=10 $(x)) ||:

s?=bash
.PHONY: %-sh
%-sh: %$(PROJ_SUFFX)
	$(call sudocompose,exec $(x) $(s)) ||:

# enabling and disabling
.PHONY: %-enable %-disable
%-enable: %$(PROJ_SUFFX)$(DOWN_SUFFX)
	mv "$<" "$(basename $<)"
%-disable: %$(PROJ_SUFFX)
	mv "$<" "$<$(DOWN_SUFFX)"

# Combinations
.PHONY: %-update
%-update: %$(PROJ_SUFFX) %-build %-pull
	$(MAKE) $(basename $<)-up

# Arbitrary compose command
.PHONY: %-cmd
%-cmd: %$(PROJ_SUFFX)
	$(call sudocompose,$(x))

#########
# project creation
.PHONY: %-new
%-new:
	$(eval proj_dir:=$(patsubst %-new,%$(PROJ_SUFFX)$(DOWN_SUFFX),$@))
	mkdir $(proj_dir)
	$(eval export COMPOSEFILE)
	echo -e "$$COMPOSEFILE" > $(proj_dir)/docker-compose.yml

# default compose file
define COMPOSEFILE
version: "2"

networks:
  # reachable from outside
  default:
    driver: bridge
  # interconnects projects
  gassi:
    external:
      name: $$DOCKERNET

services:
  something:
    image: maintainer/repo:tag
    restart: unless-stopped
		networks:
		  - default
		  - gassi
    [...]
endef