.DEFAULT_GOAL := engine

CSI ?= csi
CSI_FLAGS := -I $(CURDIR) -I $(CURDIR)/bin

# Canonical release string for the tree — keep in sync with downstroke.egg and
# README v… markers (see bump-version).
VERSION := 1.0.0

# Modules listed in dependency order
MODULE_NAMES := entity tween tilemap world input physics renderer assets animation engine mixer sound prefabs scene-loader
OBJECT_FILES := $(patsubst %,bin/%.o,$(MODULE_NAMES))

DEMO_NAMES := getting-started platformer shmup topdown audio sandbox spritefont menu tweens scaling animation
DEMO_BINS  := $(patsubst %,bin/demo-%,$(DEMO_NAMES))

UNIT_NAMES := $(patsubst %,downstroke.%,$(MODULE_NAMES))
USES_FLAGS := $(patsubst %,-uses %,$(UNIT_NAMES))

# Build all engine modules
engine: $(OBJECT_FILES)

bin:
	@mkdir -p $@

# Explicit inter-module dependencies
bin/entity.o:
bin/tween.o: bin/entity.o
bin/tilemap.o:
bin/world.o: bin/entity.o bin/tilemap.o
bin/input.o: bin/entity.o
bin/physics.o: bin/entity.o bin/world.o bin/tilemap.o
bin/renderer.o: bin/entity.o bin/tilemap.o bin/world.o
bin/assets.o:
bin/animation.o: bin/entity.o bin/world.o
bin/engine.o: bin/renderer.o bin/world.o bin/input.o bin/assets.o bin/physics.o bin/tween.o bin/animation.o
bin/mixer.o:
bin/sound.o: bin/mixer.o
bin/prefabs.o: bin/entity.o
bin/scene-loader.o: bin/world.o bin/tilemap.o bin/assets.o bin/engine.o bin/prefabs.o

# Pattern rule: compile each module as a library unit
bin/%.o: %.scm | bin
	csc -c -J -unit downstroke.$* $*.scm -o bin/$*.o -I bin
	@if [ -f downstroke.$*.import.scm ]; then mv downstroke.$*.import.scm bin/; fi

.PHONY: clean test engine demos filter format bump-version

# Reformat every tracked .scm file with Emacs `indent-region` under the user's
# real init (so geiser-chicken / scheme-mode rules apply consistently).
# Override EMACS_INIT_DIR / EMACS_SUBSTRATE_DIR if your config lives elsewhere.
EMACS_INIT_DIR      ?= $(HOME)/.emacs-perso
EMACS_SUBSTRATE_DIR ?= $(EMACS_INIT_DIR)/emacs-substrate
format:
	@emacs --batch \
	  --init-directory=$(EMACS_INIT_DIR) \
	  --eval "(add-to-list 'load-path \"$(EMACS_SUBSTRATE_DIR)/\")" \
	  -l $(EMACS_INIT_DIR)/init.el \
	  -l format.el \
	  --eval "(downstroke-format-tracked-scm-files)"

clean:
	rm -rf bin downstroke/
	rm -f *.import.scm *.import.so *.so *.o *.link
	rm -f *.log

test:
	@echo "Running unit tests..."
	@$(CSI) $(CSI_FLAGS) -s tests/entity-test.scm
	@$(CSI) $(CSI_FLAGS) -s tests/world-test.scm
	@$(CSI) $(CSI_FLAGS) -s tests/tilemap-test.scm
	@$(CSI) $(CSI_FLAGS) -s tests/physics-test.scm
	@$(CSI) $(CSI_FLAGS) -s tests/input-test.scm
	@$(CSI) $(CSI_FLAGS) -s tests/renderer-test.scm
	@$(CSI) $(CSI_FLAGS) -s tests/assets-test.scm
	@$(CSI) $(CSI_FLAGS) -s tests/engine-test.scm
	@$(CSI) $(CSI_FLAGS) -s tests/animation-test.scm
	@$(CSI) $(CSI_FLAGS) -s tests/prefabs-test.scm
	@$(CSI) $(CSI_FLAGS) -s tests/scene-loader-test.scm
	@$(CSI) $(CSI_FLAGS) -s tests/tween-test.scm

# Run a single test file with optional name/group filtering (pytest -k style).
#   make filter FILE=tests/physics-test.scm            # whole file
#   make filter FILE=tests/physics-test.scm K=gravity  # tests matching regex
#   make filter FILE=tests/physics-test.scm G=apply    # groups matching regex
# Note: combining K/G with TEST_QUIET=1 hits a known bug in the `test` egg
# (modulo error in summary timing), so this target intentionally doesn't
# expose Q. Use `TEST_QUIET=1 $(CSI) $(CSI_FLAGS) -s <file>` when you want quiet.
filter:
	@if [ -z "$(FILE)" ]; then echo "usage: make filter FILE=<test.scm> [K=name-regex] [G=group-regex]"; exit 2; fi
	@$(if $(K),TEST_FILTER='$(K)') $(if $(G),TEST_GROUP_FILTER='$(G)') $(CSI) $(CSI_FLAGS) -s $(FILE)

demos: engine $(DEMO_BINS)

bin/demo-%: demo/%.scm $(OBJECT_FILES) | bin
	csc demo/$*.scm $(OBJECT_FILES) -o bin/demo-$* -I bin $(USES_FLAGS) -L -lSDL2_mixer

# Bump VERSION, downstroke.egg, and README v… strings (POSIX sed: write temp, mv).
# NEW must not contain &, backslash, or # (sed replacement / delimiter limits).
bump-version:
ifndef NEW
	$(error usage: make bump-version NEW=1.2.3)
endif
	@set -e; \
	test "$(VERSION)" != "$(NEW)" || { echo "bump-version: already at $(VERSION)"; exit 0; }; \
	old='$(VERSION)'; new='$(NEW)'; \
	oesc=$$(printf '%s' "$$old" | sed 's/\./\\./g'); \
	t=$$$$.bump; \
	sed "s#^VERSION := $$oesc#VERSION := $$new#" Makefile > "Makefile.$$t" && mv "Makefile.$$t" Makefile; \
	sed "s#((version \"$$oesc\")#((version \"$$new\")#" downstroke.egg > "downstroke.egg.$$t" && mv "downstroke.egg.$$t" downstroke.egg; \
	echo "bump-version: $$old -> $$new (Makefile, downstroke.egg)"