##
## This Makefile exists to produce WASM builds.
## Do not use it if that isn't your goal!
##

# # # Configuration Variables # # #
#
# Patch these to select a different build profile or target
# The target shouldn't change any time soon. WASM64, I guess. Other targets
# aren't aimed at the web, so you shouldn't be using this makefile.
CARGO_TARGET := wasm32-unknown-unknown
CARGO_PROFILE := tiny

# # # Automatic Variables # # #
SRC_DIR = ./src
SRCS := $(wildcard $(SRC_DIR)/**)

ASSET_SOURCE := $(wildcard assets/**)
ASSETS := $(patsubst assets/%.ogg, out/assets/%.ogg, $(ASSET_SOURCE))

CRATE_VERSION != sed -nre 's/^version = "(.*)"/\1/p' Cargo.toml

.PHONY: clean full-clean tarball tarball-standalone web web-standalone

# "Standalone" version. It includes an index.html to serve as-is
web-standalone: out/asteroids.js out/asteroids_bg.wasm.gz out/index.html $(ASSETS)

# "Bundle-able" version. It has a page, but no index.html. Consumers are
# expected to provide their own index.html and link to this page.
web: out/asteroids.js out/asteroids_bg.wasm.gz out/asteroids.html $(ASSETS)

tarball: asteroids_web_root.tar

tarball_standalone: asteroids_web_root_standalone.tar

asteroids_web_root.tar: out/asteroids.js out/asteroids_bg.wasm.gz out/asteroids.html $(ASSETS)
	tar -caf $@ $^

asteroids_web_root_standalone.tar: out/asteroids.js out/asteroids_bg.wasm.gz out/index.html $(ASSETS)
	tar -caf $@ $^

target/$(CARGO_TARGET)/$(CARGO_PROFILE)/asteroids.wasm: $(SRCS) Cargo.lock Cargo.toml
	cargo build --profile $(CARGO_PROFILE) --target $(CARGO_TARGET)

out:
	mkdir $@

out/assets: | out
	mkdir $@

out/assets/%.ogg: assets/%.ogg | out/assets
	cp -ar assets/$*.ogg $@

# Both the JS and WASM files are generated by the wasm-bindgen call, so both
# get to be on the target half of this recipe.
out/asteroids.js out/asteroids_bg.wasm.gz &: target/$(CARGO_TARGET)/$(CARGO_PROFILE)/asteroids.wasm | out
	wasm-bindgen --no-typescript --target web --out-dir ./out/ --out-name asteroids target/$(CARGO_TARGET)/$(CARGO_PROFILE)/asteroids.wasm
	gzip -9 -f out/asteroids_bg.wasm

# Copies the index page to the output dir.
out/index.html: www/index.html
	cp -a $< $@
	rm -f out/asteroids.html
	sed -i -e "s/#CRATE_VERSION_PLACEHOLDER#/$(CRATE_VERSION)/" $@

# Like `out/index.html`, but renames the page for use in a larger site.
out/asteroids.html: www/index.html
	cp -a $< $@
	rm -f out/index.html

# Clean the web build, but not the Cargo cache. Cargo handles it's own caching
# and I don't want to obliterate it all the time.
clean:
	rm -rf out/ asteroids_web_root.tar asteroids_web_root_standalone.tar

# Delete everything, including the Cargo build cache. In case someone needs
# this, I guess.
full-clean: clean
	cargo clean

# Installation goal. It's meant to be a helper utility for moving the built
# output into the web root. Only supports the "bundle-able" mode.
install: web
	install -dm0755 $(DESTDIR)
	install -dm0755 $(DESTDIR)/assets
	install -m0644 out/asteroids.js $(DESTDIR)/
	install -m0644 out/asteroids_bg.wasm.gz $(DESTDIR)/
	install -m0644 out/asteroids.html $(DESTDIR)/
	install -m0644 $(ASSETS) $(DESTDIR)/assets/