# gKeyMapper - Build
# Dependencies: g++, pkg-config, gettext (msgfmt, for the translations),
#               libgtk-4-dev, libusb-1.0-0-dev, libxkbcommon-dev
# Installation: sudo apt install build-essential gettext libgtk-4-dev libusb-1.0-0-dev libxkbcommon-dev

CXX ?= g++
CXXFLAGS ?= -std=c++17 -O2 -Wall -Wextra -Wpedantic
PKG_CONFIG ?= pkg-config
MSGFMT ?= msgfmt
GLIB_COMPILE_RESOURCES ?= glib-compile-resources

GTK_CFLAGS := $(shell $(PKG_CONFIG) --cflags gtk4)
GTK_LIBS   := $(shell $(PKG_CONFIG) --libs gtk4)
USB_CFLAGS := $(shell $(PKG_CONFIG) --cflags libusb-1.0)
USB_LIBS   := $(shell $(PKG_CONFIG) --libs libusb-1.0)
XKB_CFLAGS := $(shell $(PKG_CONFIG) --cflags xkbcommon)
XKB_LIBS   := $(shell $(PKG_CONFIG) --libs xkbcommon)
GIO_CFLAGS := $(shell $(PKG_CONFIG) --cflags gio-2.0)
GIO_LIBS   := $(shell $(PKG_CONFIG) --libs gio-2.0)

PACKAGE    := gkeymapper
TARGET     := gkeymapper
DAEMON     := gkeymapper-daemon
SRC_DIR    := src
SHARED_DIR := shared
DAEMON_DIR := daemon
GUI_SOURCES    := $(wildcard $(SRC_DIR)/*.cpp) $(wildcard $(SHARED_DIR)/*.cpp)
GUI_HEADERS    := $(wildcard $(SRC_DIR)/*.h) $(wildcard $(SHARED_DIR)/*.h)
DAEMON_SOURCES := $(wildcard $(DAEMON_DIR)/*.cpp) $(wildcard $(SHARED_DIR)/*.cpp)
DAEMON_HEADERS := $(wildcard $(DAEMON_DIR)/*.h) $(wildcard $(SHARED_DIR)/*.h)
# Icons embedded into the GUI (generated from data/icons.gresource.xml).
GUI_RES        := build/gresources.c
GUI_RES_SRC    := data/icons.gresource.xml
PREFIX     ?= /usr/local
DEB_VERSION ?= 0.1.0
DEB_ARCH    := $(shell dpkg --print-architecture 2>/dev/null || echo amd64)
BINDIR     := $(PREFIX)/bin
LOCALEDIR  := $(PREFIX)/share/locale
ASSETS_DIR := $(PREFIX)/share/$(PACKAGE)/assets
UDEV_DIR   := $(PREFIX)/lib/udev/rules.d
MODULES_DIR := $(PREFIX)/lib/modules-load.d
UNIT_DIR   := $(PREFIX)/lib/systemd/user
DBUS_DIR   := $(PREFIX)/share/dbus-1/services

CXXFLAGS += -DPACKAGE=\"$(PACKAGE)\" -DLOCALEDIR=\"$(LOCALEDIR)\" -DASSETS_DIR=\"$(ASSETS_DIR)\"
CXXFLAGS += -I$(SHARED_DIR)

# Translations. The .pot is generated from the sources (make pot) and the
# catalogs are merged against it (scripts/i18n.sh update); the rules are in
# po/README.md.
PO_FILES := $(wildcard po/*.po)
LANGS    := $(patsubst po/%.po,%,$(PO_FILES))
MO_FILES := $(patsubst %,locale/%/LC_MESSAGES/$(PACKAGE).mo,$(LANGS))
I18N     := $(CURDIR)/scripts/i18n.sh

.PHONY: all clean run install translations daemon pot i18n-check i18n-status deb

all: $(TARGET) translations $(DAEMON)

# Embedded GUI icons. --c-name keeps the gkeymapper_* symbols stable; --sourcedir
# is the repository root because the XML refers to the assets by their real path.
$(GUI_RES): $(GUI_RES_SRC) assets/icon.png assets/icon.svg
	@mkdir -p $(@D)
	$(GLIB_COMPILE_RESOURCES) --generate-source --target=$@ --sourcedir=. \
		--c-name $(PACKAGE) $(GUI_RES_SRC)

$(TARGET): $(GUI_SOURCES) $(GUI_HEADERS) $(GUI_RES)
	$(CXX) $(CXXFLAGS) $(GTK_CFLAGS) $(XKB_CFLAGS) -o $@ $(GUI_SOURCES) $(GUI_RES) $(GTK_LIBS) $(XKB_LIBS)

daemon: $(DAEMON)

$(DAEMON): $(DAEMON_SOURCES) $(DAEMON_HEADERS)
	$(CXX) $(CXXFLAGS) $(USB_CFLAGS) $(XKB_CFLAGS) $(GIO_CFLAGS) -o $@ $(DAEMON_SOURCES) $(USB_LIBS) $(XKB_LIBS) $(GIO_LIBS)

translations: $(MO_FILES)

locale/%/LC_MESSAGES/$(PACKAGE).mo: po/%.po
	@mkdir -p $(@D)
	$(MSGFMT) -o $@ $<

# Regenerate po/gkeymapper.pot from the sources. "make translations" does not: a
# pot that is written by a build is a pot that nobody has looked at, and the
# strings are reviewed by hand (po/README.md, "Adding or changing a string").
pot:
	$(I18N) extract

# Everything that can be wrong with the translations at once: the pot against the
# sources, every catalog against the pot, and the language list of the GUI against
# po/*.po. Run it before committing a string change.
i18n-check:
	$(I18N) check

i18n-status:
	$(I18N) status

run: $(TARGET) translations
	GKEYMAPPER_LOCALEDIR=$(CURDIR)/locale GKEYMAPPER_ASSETS_DIR=$(CURDIR)/assets ./$(TARGET)

deb:
	$(CURDIR)/scripts/make-deb.sh $(DEB_VERSION) $(DEB_ARCH)


clean:
	rm -f $(TARGET) $(DAEMON)
	rm -rf locale build

install: $(TARGET) $(DAEMON) translations
	install -d $(DESTDIR)$(BINDIR)
	install -m 755 $(TARGET) $(DESTDIR)$(BINDIR)/$(TARGET)
	install -m 755 $(DAEMON) $(DESTDIR)$(BINDIR)/$(DAEMON)
	install -d $(DESTDIR)$(ASSETS_DIR)
	install -m 644 assets/* $(DESTDIR)$(ASSETS_DIR)/
	install -d $(DESTDIR)$(PREFIX)/share/icons/hicolor/256x256/apps
	install -m 644 assets/icon.png $(DESTDIR)$(PREFIX)/share/icons/hicolor/256x256/apps/$(PACKAGE).png
	install -d $(DESTDIR)$(PREFIX)/share/icons/hicolor/scalable/apps
	install -m 644 assets/icon.svg $(DESTDIR)$(PREFIX)/share/icons/hicolor/scalable/apps/$(PACKAGE).svg
	-command -v gtk-update-icon-cache >/dev/null && gtk-update-icon-cache -q -t $(DESTDIR)$(PREFIX)/share/icons/hicolor 2>/dev/null || true
	install -d $(DESTDIR)$(PREFIX)/share/applications
	install -m 644 data/gkeymapper.desktop $(DESTDIR)$(PREFIX)/share/applications/$(PACKAGE).desktop
	-command -v update-desktop-database >/dev/null && update-desktop-database $(DESTDIR)$(PREFIX)/share/applications 2>/dev/null || true
	for lang in $(LANGS); do \
		install -d $(DESTDIR)$(LOCALEDIR)/$$lang/LC_MESSAGES; \
		install -m 644 locale/$$lang/LC_MESSAGES/$(PACKAGE).mo \
			$(DESTDIR)$(LOCALEDIR)/$$lang/LC_MESSAGES/$(PACKAGE).mo; \
	done
	# udev: access to the vendor interface and /dev/uinput without root.
	install -d $(DESTDIR)$(UDEV_DIR)
	install -m 644 data/60-gkeymapper.rules $(DESTDIR)$(UDEV_DIR)/60-gkeymapper.rules
	# Kernel module needed for the virtual keyboard.
	install -d $(DESTDIR)$(MODULES_DIR)
	install -m 644 data/gkeymapper-uinput.conf $(DESTDIR)$(MODULES_DIR)/$(PACKAGE).conf
	# systemd user unit (@BINDIR@ is substituted with the configured PREFIX).
	install -d $(DESTDIR)$(UNIT_DIR)
	sed 's|@BINDIR@|$(BINDIR)|g' data/$(DAEMON).service > $(DESTDIR)$(UNIT_DIR)/$(DAEMON).service
	chmod 644 $(DESTDIR)$(UNIT_DIR)/$(DAEMON).service
	# D-Bus activation: the first GUI call can start the daemon on demand.
	install -d $(DESTDIR)$(DBUS_DIR)
	sed 's|@BINDIR@|$(BINDIR)|g' data/dev.rager.gkeymapper.Daemon.service > $(DESTDIR)$(DBUS_DIR)/dev.rager.gkeymapper.Daemon.service
	chmod 644 $(DESTDIR)$(DBUS_DIR)/dev.rager.gkeymapper.Daemon.service
	-command -v udevadm >/dev/null && udevadm control --reload-rules 2>/dev/null || true
	-systemctl --user daemon-reload 2>/dev/null || true
	@echo
	@echo "Installed. Enable the daemon in your user session with:"
	@echo "  systemctl --user daemon-reload"
	@echo "  systemctl --user enable --now $(DAEMON)"