# Multi-stage Dockerfile for Spring Boot Application
FROM maven:3.9-eclipse-temurin-17 AS build
WORKDIR /app

# Copy dependency files first for better caching
COPY pom.xml .
RUN mvn dependency:go-offline -B

# Copy source code and build
COPY src ./src
RUN mvn clean package -DskipTests

# Runtime stage - lean JRE for Spring Boot executable JAR (~200MB vs ~500MB Tomcat)
FROM mcr.microsoft.com/openjdk/jdk:17-ubuntu
WORKDIR /app

# Create non-root user for security
RUN groupadd -g 1001 appuser && useradd -u 1001 -g appuser -s /bin/sh appuser && \
    chown -R appuser:appuser /app
USER appuser

COPY --from=build /app/target/*.jar app.jar

EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=30s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:8080/actuator/health || exit 1

CMD ["java", "-jar", "app.jar"]