BINARY    := latchd
SRC_DIR   := src
CMD_DIR   := $(SRC_DIR)
BUILD_DIR := build

PREFIX    ?= /usr
BINDIR    := $(DESTDIR)$(PREFIX)/bin
CONFDIR   := $(DESTDIR)/etc/$(BINARY)
SYSTEMD   := $(DESTDIR)/usr/lib/systemd/system

VERSION   ?= 0.1.0
COMMIT    := $(shell git rev-parse --short HEAD 2>/dev/null || echo "unknown")
BUILDDATE := $(shell date -u '+%Y-%m-%d_%H:%M:%S')

LDFLAGS   := -s -w \
	-X main.Version=$(VERSION) \
	-X main.Commit=$(COMMIT) \
	-X main.BuildTime=$(BUILDDATE)

GO        := go
GOFLAGS   := -trimpath -ldflags="$(LDFLAGS)"

##  ansi helpers
BOLD      := \033[1m
DIM       := \033[2m
RED       := \033[31m
GREEN     := \033[32m
YELLOW    := \033[33m
BLUE      := \033[34m
CYAN      := \033[36m
WHITE     := \033[37m
RST       := \033[0m

##  ─── targets ────────────────────────────────────────────────

.PHONY: all deps build install uninstall clean test lint fmt vet \
        run-preview release enable update help

deps:  ## install system dependencies
	@printf "  $(BLUE)%-10s$(RST) checking dependencies...\n" "DEPS"
	@if ! dpkg -s libpam0g-dev >/dev/null 2>&1; then \
		printf "  $(YELLOW)%-10s$(RST) sudo apt install -y libpam0g-dev\n" ""; \
		sudo apt install -y libpam0g-dev; \
	fi
	@if ! dpkg -s build-essential >/dev/null 2>&1; then \
		printf "  $(YELLOW)%-10s$(RST) sudo apt install -y build-essential\n" ""; \
		sudo apt install -y build-essential; \
	fi
	@if ! command -v go >/dev/null 2>&1; then \
		printf "  $(RED)%-10s$(RST) go not found — install go 1.22+\n" ""; \
		exit 1; \
	fi
	@printf "  $(GREEN)%-10s$(RST) dependencies ok\n" "DEPS"

all: build  ## build the release binary

build: $(BUILD_DIR)/$(BINARY)  ## compile latchd

$(BUILD_DIR)/$(BINARY): $(shell find $(SRC_DIR) -name '*.go')
	@printf "  $(CYAN)%-10s$(RST) %s\n" "GO" "$@"
	@mkdir -p $(BUILD_DIR)
	@cd $(SRC_DIR) && $(GO) build $(GOFLAGS) -o ../$@ .

install: build  ## install to $(PREFIX)
	@printf "  $(GREEN)%-10s$(RST) %s\n" "INSTALL" "$(BINDIR)/$(BINARY)"
	@install -Dm755 $(BUILD_DIR)/$(BINARY) $(BINDIR)/$(BINARY)
	@install -Dm644 extra/config.toml  $(CONFDIR)/config.toml
	@install -Dm755 extra/xsetup.sh   $(CONFDIR)/xsetup.sh
	@install -Dm644 extra/lemurs.pam  $(DESTDIR)/etc/pam.d/$(BINARY)
	@install -Dm644 extra/lemurs.service $(SYSTEMD)/$(BINARY).service
	@mkdir -p $(CONFDIR)/wms $(CONFDIR)/wayland
	@printf "  $(GREEN)%-10s$(RST) done — run 'systemctl enable $(BINARY)' to activate\n" "INSTALL"

uninstall:  ## remove installed files
	@printf "  $(RED)%-10s$(RST) %s\n" "RM" "$(BINDIR)/$(BINARY)"
	@rm -f $(BINDIR)/$(BINARY)
	@rm -rf $(CONFDIR)
	@rm -f $(DESTDIR)/etc/pam.d/$(BINARY)
	@rm -f $(SYSTEMD)/$(BINARY).service

clean:  ## remove build artifacts
	@printf "  $(RED)%-10s$(RST) %s\n" "RM" "$(BUILD_DIR)"
	@rm -rf $(BUILD_DIR)

test:  ## run tests
	@printf "  $(YELLOW)%-10s$(RST) running tests...\n" "TEST"
	@cd $(SRC_DIR) && $(GO) test ./...

lint:  ## run linter
	@printf "  $(YELLOW)%-10s$(RST) linting...\n" "LINT"
	@golangci-lint run $(SRC_DIR)/... 2>/dev/null || printf "  $(DIM)%-10s$(RST) golangci-lint not found; skipping\n" ""

fmt:  ## format source
	@printf "  $(BLUE)%-10s$(RST) formatting...\n" "FMT"
	@cd $(SRC_DIR) && $(GO) fmt ./...

vet:  ## run go vet
	@printf "  $(YELLOW)%-10s$(RST) vetting...\n" "VET"
	@cd $(SRC_DIR) && $(GO) vet ./...

run-preview: build  ## launch preview mode
	@printf "  $(GREEN)%-10s$(RST) starting preview...\n" "RUN"
	@./$(BUILD_DIR)/$(BINARY) --preview --no-log

release: clean  ## build with version info
	@printf "  $(BOLD)$(CYAN)╔══════════════════════════════════════╗$(RST)\n"
	@printf "  $(BOLD)$(CYAN)║  latchd $(VERSION)  —  release build  ║$(RST)\n"
	@printf "  $(BOLD)$(CYAN)╚══════════════════════════════════════╝$(RST)\n"
	@printf "\n"
	@printf "  $(DIM)commit$(RST)    $(COMMIT)\n"
	@printf "  $(DIM)built$(RST)     $(BUILDDATE)\n"
	@printf "\n"
	@$(MAKE) build

enable:  ## disable other DM + enable latchd
	@printf "  $(YELLOW)%-10s$(RST) switching to latchd...\n" "ENABLE"
	@if systemctl is-active display-manager.service >/dev/null 2>&1; then \
		printf "  $(DIM)%-10s$(RST) stopping current display manager\n" ""; \
		sudo systemctl stop display-manager.service; \
	fi
	@if [ -L /etc/systemd/system/display-manager.service ] \
		&& ! readlink /etc/systemd/system/display-manager.service | grep -q $(BINARY); then \
		printf "  $(DIM)%-10s$(RST) disabling aliased display manager\n" ""; \
		sudo systemctl disable display-manager.service; \
	fi
	@sudo systemctl enable $(BINARY).service
	@printf "  $(GREEN)%-10s$(RST) latchd enabled — reboot or run 'sudo systemctl start latchd'\n" "ENABLE"

update:  ## uninstall → git pull → rebuild → reinstall
	@printf "  $(YELLOW)%-10s$(RST) removing previous install...\n" "UPDATE"
	@sudo $(MAKE) uninstall
	@printf "  $(CYAN)%-10s$(RST) pulling latest...\n" "UPDATE"
	@git pull
	@printf "  $(BLUE)%-10s$(RST) rebuilding...\n" "UPDATE"
	@sudo $(MAKE) install
	@printf "  $(GREEN)%-10s$(RST) updated — run 'sudo make enable' to switch DMs\n" "UPDATE"

help:  ## print this help
	@printf "  $(BOLD)latchd$(RST) — tui display manager\n"
	@printf "  $(DIM)version $(VERSION)  commit $(COMMIT)$(RST)\n"
	@printf "\n"
	@printf "  $(WHITE)targets:$(RST)\n"
	@awk -F ':|##' '/^[a-zA-Z].*:.*##/ { \
		printf "  $(CYAN)%-16s$(RST) %s\n", $$1, $$NF }' $(MAKEFILE_LIST) \
	| sort
	@printf "\n"