# ── Configuration ─────────────────────────────────────────────────────────────

REGISTRY   := code.nochebuena.dev/einherjar/spa-server
BASE_IMAGE := alpine:3.21

# ── Git metadata ──────────────────────────────────────────────────────────────

BRANCH := $(shell git rev-parse --abbrev-ref HEAD 2>/dev/null || echo unknown)
SHA    := $(shell git rev-parse --short HEAD 2>/dev/null || echo unknown)

# Highest semver tag pointing at HEAD; falls back to the most recent reachable tag.
_TAG_AT_HEAD := $(shell git tag --points-at HEAD 2>/dev/null | sort -V | tail -1)
VERSION      := $(if $(_TAG_AT_HEAD),$(_TAG_AT_HEAD),$(shell git describe --tags --abbrev=0 2>/dev/null || echo v0.0.0))

# ── Branch suffix ─────────────────────────────────────────────────────────────
#   main       →  (none)
#   develop    →  -dev-<sha>
#   release/*  →  -qa-<sha>
#   other      →  -dev-<sha>
#
# Note: case/esac cannot be used inside $(shell) — the pattern delimiters ")"
# are mistaken by Make's parser for the closing paren of the function call.
# if/elif is used instead.

BRANCH_SUFFIX := $(shell \
	b='$(BRANCH)'; s='$(SHA)'; \
	if [ "$$b" = "main" ]; then \
		echo ""; \
	elif [ "$$b" = "develop" ]; then \
		echo "-dev-$$s"; \
	elif echo "$$b" | grep -q "^release/"; then \
		echo "-qa-$$s"; \
	else \
		echo "-dev-$$s"; \
	fi)

# ── Image tags ────────────────────────────────────────────────────────────────

VERSIONED_TAG := $(REGISTRY):$(VERSION)$(BRANCH_SUFFIX)
LATEST_TAG    := $(if $(filter main,$(BRANCH)),$(REGISTRY):latest,)
ALL_TAGS      := $(strip $(VERSIONED_TAG) $(LATEST_TAG))
TAG_FLAGS     := $(foreach t,$(ALL_TAGS),--tag $(t) )

# ── Targets ───────────────────────────────────────────────────────────────────

.DEFAULT_GOAL := dry-run

.PHONY: dry-run build push release help

## dry-run : show what would be built and pushed — no side effects.
dry-run:
	@echo ""
	@echo "  Registry : $(REGISTRY)"
	@echo "  Branch   : $(BRANCH)"
	@echo "  SHA      : $(SHA)"
	@echo "  Version  : $(VERSION)"
	@echo ""
	@echo "  Tags:"
	@$(foreach t,$(ALL_TAGS),echo "    $(t)";)
	@echo ""
	@echo "  Build args:"
	@echo "    VERSION     = $(VERSION)"
	@echo "    GIT_SHA     = $(SHA)"
	@BASE=$$(docker inspect --format='{{index .RepoDigests 0}}' $(BASE_IMAGE) 2>/dev/null | head -1); \
		echo "    BASE_DIGEST = $${BASE:-(not resolved — run: docker pull $(BASE_IMAGE))}"
	@echo ""

## build    : build the image with all computed tags and OCI labels.
build:
	docker build \
		$(TAG_FLAGS) \
		--build-arg VERSION=$(VERSION) \
		--build-arg GIT_SHA=$(SHA) \
		--build-arg BASE_DIGEST=$$(docker inspect --format='{{index .RepoDigests 0}}' $(BASE_IMAGE) 2>/dev/null | head -1) \
		.

## push     : push all computed tags to the registry.
push:
	@for tag in $(ALL_TAGS); do \
		echo "→ pushing $$tag"; \
		docker push $$tag || exit 1; \
	done

## release  : build then push.
release: build push

## help     : list available targets.
help:
	@grep -E '^## ' Makefile | sed 's/^## /  /'