# === Build stage ===
FROM eclipse-temurin:17 AS build

# Install sbt
RUN apt-get update && apt-get install -y curl gnupg && \
    echo "deb https://repo.scala-sbt.org/scalasbt/debian all main" > /etc/apt/sources.list.d/sbt.list && \
    curl -sL "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x2EE0EA64E40A89B84B2DF73499E82A75642AC823" | apt-key add && \
    apt-get update && apt-get install -y sbt && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Cache dependency resolution
COPY build.sbt .
COPY project/build.properties project/
COPY project/plugins.sbt project/
RUN sbt update

# Copy source and build fat JAR
COPY src/ src/
RUN sbt assembly

# === Runtime stage ===
FROM eclipse-temurin:17-jre-alpine

RUN addgroup -S app && adduser -S app -G app
WORKDIR /app

COPY --from=build /app/target/scala-3.7.1/demoapp.jar ./demoapp.jar

RUN chown -R app:app /app
USER app

EXPOSE 8080

ENV PORT=8080
ENV JAVA_OPTS="-XX:MaxRAMPercentage=75.0 -XX:+UseSerialGC"

ENTRYPOINT ["sh", "-c", "exec java $JAVA_OPTS -jar demoapp.jar"]