# Copyright (C) 2023-2024  Umorpha Systems
# SPDX-License-Identifier: AGPL-3.0-or-later

# User config ##################################################################

# GNU standard https://www.gnu.org/prep/standards/standards.html
DESTDIR ?=
prefix         ?= /usr/local
exec_prefix    ?= $(prefix)
bindir         ?= $(exec_prefix)/bin
libdir         ?= $(exec_prefix)/lib
sysconfdir     ?= $(prefix)/etc
localstatedir  ?= $(prefix)/var
runstatedir    ?= $(localstatedir)/run
# Not quite GNU standard
systemdunitdir ?= $(libdir)/systemd/system
sysusersdir    ?= $(libdir)/sysusers.d

# Intro ########################################################################

all: build
.PHONY: all

go_programs := $(sort $(patsubst cmd/%/,%,$(wildcard cmd/*/)))

.DELETE_ON_ERROR:
.NOTINTERMEDIATE:

FORCE:
.PHONY: FORCE

# Generate #####################################################################

generate/files = COPYING.txt
COPYING.txt:
	curl https://www.gnu.org/licenses/agpl-3.0.txt >$@

generate: $(generate/files)
generate-clean:
	rm -f -- $(generate/files)
.PHONY: generate generate-clean

# Build ########################################################################

build/go-flags = -trimpath -tags=libsqlite3 $(if $(wildcard .git),,-buildvcs=false)

build/cfgvars = bindir localstatedir runstatedir sysconfdir build/etc-sources
build/etc-sources = $(sort $(filter-out $(build/files),$(wildcard etc/*)))
build/varsubst = sed $(foreach v,$(build/cfgvars), -e 's|@$v@|$($v)|g' )
build/cp-ifchanged = if cmp -s $< $@; then echo $@: already up to date; else PS4=; set -x; cp -f $< $@; fi

build/files  = $(addprefix bin/,$(go_programs))
build/files += config.go
build/files += etc/eclipse.yml
build/files += etc/eclipse-httpd.service
build/files += etc/eclipse-httpd.socket
build/files += etc/eclipse-trigger.service

build: $(build/files)
clean:
	rm -f -- $(filter-out bin/%,$(build/files)) .*.stamp etc/.*.stamp
	rm -rf bin
.PHONY: build clean

bin:
	mkdir $@
$(foreach p,$(go_programs),bin/.$p.stamp): bin/.%.stamp: cmd/% generate config.go
	go build $(build/go-flags) -o $@ ./$<
$(foreach p,$(go_programs),bin/$p): bin/%: bin/.%.stamp
	@$(build/cp-ifchanged)

.config.go.stamp: .%.stamp: %.in FORCE
	$(build/varsubst) <$< >$@
config.go: %: .%.stamp
	@$(build/cp-ifchanged)

etc/.%.stamp: etc/%.in FORCE
	$(build/varsubst) <$< >$@
etc/%: etc/.%.stamp
	@$(build/cp-ifchanged)

# Install ######################################################################

install/files  = $(addprefix $(DESTDIR)$(bindir)/,$(go_programs))
install/files += $(DESTDIR)$(sysconfdir)/eclipse/eclipse.yml
install/files += $(DESTDIR)$(sysconfdir)/eclipse/actions.d
install/files += $(DESTDIR)$(systemdunitdir)/eclipse-httpd.socket
install/files += $(DESTDIR)$(systemdunitdir)/eclipse-httpd.service
install/files += $(DESTDIR)$(systemdunitdir)/eclipse-trigger.timer
install/files += $(DESTDIR)$(systemdunitdir)/eclipse-trigger.service
install/files += $(DESTDIR)$(sysusersdir)/eclipse.conf

install: $(install/files)
uninstall:
	rm -f -- $(filter-out %.d,$(install/files))
	rmdir -p -- $(filter %.d,$(install/files)) || true
.PHONY: install uninstall

$(addprefix $(DESTDIR)$(bindir)/,$(go_programs)): $(DESTDIR)$(bindir)/%: bin/%
	install -Dm755 $< $@
$(DESTDIR)$(sysconfdir)/eclipse/eclipse.yml: etc/eclipse.yml
	install -Dm644 $< $@
$(DESTDIR)$(sysconfdir)/eclipse/actions.d:
	mkdir -p $@

$(DESTDIR)$(systemdunitdir)/%.socket: etc/%.socket
	install -Dm644 $< $@
$(DESTDIR)$(systemdunitdir)/%.timer: etc/%.timer
	install -Dm644 $< $@
$(DESTDIR)$(systemdunitdir)/%.service: etc/%.service
	install -Dm644 $< $@
$(DESTDIR)$(sysusersdir)/eclipse.conf: etc/sysusers.conf
	install -Dm644 $< $@