FROM debian:bookworm-slim AS builder

# need git, openjdk and android sdk
RUN apt-get update && apt-get install -y git openjdk-17-jdk-headless sdkmanager

# get required android sdk
RUN sdkmanager "build-tools;30.0.3" "platforms;android-33"

# accept licenses for android sdk
RUN yes | sdkmanager --licenses

WORKDIR /home

# create a debug keystore for signing apk
RUN keytool -genkey -v -keystore debug.keystore -storepass android -alias androiddebugkey -keypass android -keyalg RSA -keysize 2048 -validity 10000 -dname "CN=Android Debug,O=Android,C=US"

# copy gradle wrapper
COPY ./gradlew /home/project/gradlew
COPY ./gradle/wrapper /home/project/gradle/wrapper
COPY gradle.properties /home/project/gradle.properties

# enter project folder
WORKDIR /home/project

# downloaded the gradle runtime
RUN chmod 700 ./gradlew
RUN ./gradlew --no-daemon --version

# copy source code
COPY app /home/project/app
COPY build.gradle /home/project/build.gradle
COPY settings.gradle /home/project/settings.gradle

# create a keystore.properties file in the ROOT DIRECTORY of project
RUN echo "\
storePassword=android\n\
keyPassword=android\n\
keyAlias=androiddebugkey\n\
storeFile=/home/debug.keystore\
" > keystore.properties

# run the gradlew wrapper to build apk
RUN ANDROID_HOME=/opt/android-sdk ./gradlew assembleDebug --no-daemon

FROM scratch AS output

COPY --from=builder /home/project/app/build/outputs/apk/debug/app-debug.apk .