# Build stage
FROM gradle:8.10.1-jdk21 AS build

WORKDIR /app

# Copy Gradle wrapper and build files for dependency caching
COPY gradle/ gradle/
COPY gradlew gradlew.bat ./
COPY build.gradle settings.gradle ./

# Copy source code
COPY services/shortener-service/build.gradle ./services/shortener-service/
COPY services/shortener-service/src ./services/shortener-service/src/

# Build the application
RUN chmod +x gradlew
RUN ./gradlew :services:shortener-service:bootJar --no-daemon

# Runtime stage
FROM eclipse-temurin:21-jre-jammy AS runtime

# Install curl for health checks (minimal size impact)
RUN apt-get update && \
    apt-get install -y --no-install-recommends curl && \
    rm -rf /var/lib/apt/lists/*

# Create non-root user
RUN groupadd -r spring && useradd -r -g spring spring

# Set working directory
WORKDIR /app

# Copy the JAR from build stage
COPY --from=build /app/services/shortener-service/build/libs/*.jar app.jar

# Change ownership to non-root user
RUN chown spring:spring app.jar

# Switch to non-root user
USER spring:spring

# Expose application port
EXPOSE 8080

# Health check for Kubernetes (can be overridden by K8s probes)
HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
  CMD curl -f http://localhost:8080/actuator/health || exit 1

# Optimize JVM for containers
ENV JAVA_OPTS="-XX:MaxRAMPercentage=75.0 -XX:+UseG1GC"

# Run the application
ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]