# JVM stack overlay fragment.
#
# Layer this on top of huskies-project-base to produce a project container
# with OpenJDK 21, Maven, and eclipse.jdt.ls (the canonical Java/JVM LSP).
#
# Build the combined image:
#   (echo "FROM huskies-project-base"; \
#    cat docker/stacks/jvm/Dockerfile.fragment) | \
#   docker build -t huskies-project-jvm -
#
# Adding a new stack: create docker/stacks/<name>/Dockerfile.fragment and
# docker/stacks/<name>/markers — no changes to orchestration code required.

USER root

# OpenJDK 21 (current LTS) and Maven for build support.
RUN apt-get update && apt-get install -y --no-install-recommends \
        openjdk-21-jdk-headless \
        maven \
    && rm -rf /var/lib/apt/lists/*

ENV JAVA_HOME="/usr/lib/jvm/java-21-openjdk-amd64"

# Eclipse JDT Language Server — canonical LSP for Java/JVM (Java, Kotlin, Groovy).
# Pin to a specific release; update JDTLS_VERSION + JDTLS_BUILD for upgrades.
# All releases: https://github.com/eclipse-jdtls/eclipse.jdt.ls/releases
ENV JDTLS_VERSION="1.38.0" \
    JDTLS_BUILD="202503271418"
RUN mkdir -p /opt/jdtls \
    && curl -fsSL \
        "https://download.eclipse.org/jdtls/milestones/${JDTLS_VERSION}/jdt-language-server-${JDTLS_VERSION}-${JDTLS_BUILD}.tar.gz" \
        | tar -xzf - -C /opt/jdtls

# Wrapper script so `jdtls` is available as a PATH command.
RUN { \
        echo '#!/bin/sh'; \
        echo 'JAR=$(ls /opt/jdtls/plugins/org.eclipse.equinox.launcher_*.jar 2>/dev/null | head -1)'; \
        echo 'exec java \'; \
        echo '  -Declipse.application=org.eclipse.jdt.ls.core.id1 \'; \
        echo '  -Dosgi.bundles.defaultStartLevel=4 \'; \
        echo '  -Declipse.product=org.eclipse.jdt.ls.core.product \'; \
        echo '  -Dlog.protocol=true \'; \
        echo '  -Dlog.level=ALL \'; \
        echo '  -jar "$JAR" \'; \
        echo '  -configuration /opt/jdtls/config_linux \'; \
        echo '  "$@"'; \
    } > /usr/local/bin/jdtls \
    && chmod +x /usr/local/bin/jdtls

USER huskies