# ============================================
# Build stage with incremental cache support
# Alpha最小化镜像 + 官方镜像源
# ============================================
FROM maven:3.8-openjdk-8 AS builder

ARG BUILD_NUMBER=local
ARG GIT_COMMIT=unknown
ARG MAVEN_OPTS=-Dmaven.wagon.http.ssl.insecure=true

ENV MAVEN_OPTS="${MAVEN_OPTS}"

WORKDIR /build

# Copy parent pom first (if exists in multi-module project)
COPY pom.xml .
COPY shop-recycle-common/ shop-recycle-common/
COPY shop-recycle-gateway/pom.xml shop-recycle-gateway/
COPY shop-recycle-order-service/pom.xml shop-recycle-order-service/
COPY shop-recycle-payment-service/pom.xml shop-recycle-payment-service/

# Download dependencies (cached layer - only changes if pom.xml changes)
RUN mvn dependency:go-offline -B -q

# Copy sources
COPY shop-recycle-gateway/src shop-recycle-gateway/src

# Build with incremental compilation (no clean!)
RUN mvn package -DskipTests -B -q \
    -pl shop-recycle-gateway \
    -am \
    -Dmaven.test.skip=true \
    -Ddocker.build.number=${BUILD_NUMBER} \
    -Dgit.commit=${GIT_COMMIT}

# ============================================
# Runtime stage - ultra-minimal image
# 使用Alpine基础镜像，可进一步用distroless替代
# ============================================
FROM openjdk:8-jre-alpine

LABEL maintainer="shop-recycle"
LABEL service="shop-recycle-gateway"
LABEL build.number=${BUILD_NUMBER}
LABEL git.commit=${GIT_COMMIT}

ENV TZ=Asia/Shanghai
ENV JAVA_OPTS="-Xms256m -Xmx512m -XX:+UseG1GC -XX:MaxGCPauseMillis=200"

WORKDIR /app

# Copy built jar from builder stage
COPY --from=builder /build/shop-recycle-gateway/target/*.jar gateway.jar

EXPOSE 8080

# Health check (在Alpine中curl需要curl包，可用wget或java命令替代)
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1

ENTRYPOINT ["sh", "-c", "java ${JAVA_OPTS} -jar gateway.jar"]