.ONESHELL:

SHELL=/bin/makefile-bash-wrapper.sh

# the include of the Makefile.app-config defines the Makefile
# variables $(BUILDTOOLS), $(ANDROID_JAR) and $(PACKAGE)
# which depend on the configuration and are necessary to have the Makefile work
# the rule whose target is Makefile.app-config will trigger a reload of this include as ncessary
# (as explained https://make.mad-scientist.net/papers/advanced-auto-dependency-generation/#include)
include Makefile.app-config

# symlink
./app.apk:  ./result/app.apk
	ln -sfrv ./result/app.apk ./app.apk

# zipalign and sign again (second signing)
./result/app.apk : ./result/signed.apk app-config.sh ./keystore
	$(BUILDTOOLS)/zipalign -v -f 4 $< $@
	$(BUILDTOOLS)/apksigner sign --ks keystore --key-pass pass:armena --ks-pass pass:armena  $@

# sign the apk file (first sign)
./result/signed.apk : ./result/unsigned.apk ./keystore 
	jarsigner -verbose -keystore ./keystore -storepass armena -keypass armena -signedjar $@ $< helljniKey

# make a "keystore" for the cryptographic signing stuff
./keystore : 
	keytool -genkeypair -validity 1000 -dname "CN=alexander,O=Android,C=JPN" -keystore $@ \
	-storepass armena -keypass armena -alias helljniKey -keyalg RSA -v

# aapt "package" together the dalvik/hex stuff (and "assets" and "res")
./result/unsigned.apk : ./result/bin/classes.dex  ./assets  ./AndroidManifest.xml
	rm -rvf "$@"
	$(BUILDTOOLS)/aapt package \
	  -v -u -f -M ./AndroidManifest.xml -S ./res \
	  -I $(ANDROID_JAR) -A ./assets -F $@ ./result/bin

# convert "java class"es files (i.e bytecode) to dalvic/d8 android thing
./result/bin/classes.dex : ./obj/$(PACKAGE)/AppActivity.class 
	mkdir -p ./result/bin
	$(BUILDTOOLS)/d8 ./obj/$(PACKAGE)/*.class \
	  --lib $(ANDROID_JAR) --output ./result/bin

# compile (javac) the class from 
./obj/$(PACKAGE)/AppActivity.class : ./src/$(PACKAGE)/AppActivity.java  ./src/$(PACKAGE)/R.java 
	mkdir -p ./obj/$(PACKAGE)
	javac -d ./obj -classpath $(ANDROID_JAR) -sourcepath ./src $<


# make the resources "R.java" thing
./src/$(PACKAGE)/R.java : $(shell find ./res -type f) app-config.sh ./AndroidManifest.xml ./android-sdk/installed
	$(BUILDTOOLS)/aapt package \
	  -v -f -m  -S ./res -J ./src -M ./AndroidManifest.xml \
	  -I $(ANDROID_JAR)

# generate the AppActivity.java (template)
./src/$(PACKAGE)/AppActivity.java: app-config.sh
	./.Makefile.scripts/make--AppActivity.java.sh > $@

# install the necessary android sdks
./android-sdk/installed: app-config.sh
	./.Makefile.scripts/make--android-sdk.sh

# generate the AndroidManifest.xml
./AndroidManifest.xml: app-config.sh
	./.Makefile.scripts/make--AndroidManifest.xml

Makefile.app-config: app-config.sh Makefile
	source app-config.sh; \
	tee $@ << MAKEFILE_APP_CONFIG
	BUILDTOOLS:=$${ANDROID_SDK_ROOT}/$$(tr ';' '/' < android-sdk/.installed.buildtools.version.current)
	ANDROID_JAR:=$${ANDROID_SDK_ROOT}/$$(tr ';' '/' < android-sdk/.installed.platforms.version.current)/android.jar
	PACKAGE:=$$(echo "$$APP_PACKAGE" | tr '.' '/')
	MAKEFILE_APP_CONFIG

# use whiptail textgui to make configuration (android API level, app-name, app-label etc...)
app-config.sh: 
	./.Makefile.scripts/make--app-config.sh

# rule to effectuate a cleanup
clean:
	rm -rf obj/* result/*

# this rule's purpose is to run "by force" no matter what, doing nothing
# as listed prerequisite to another rule it causes that rule to be made/run 
# unconditionally every time  
FORCE:
	@true