# ============================================
# Build stage with optimized cache strategy
# 优化缓存：分离 POM 和源代码复制
# ============================================
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

# 第一层：复制 POM 和 common 完整源代码（缓存关键）
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/

# 第二层：构建 common 模块（完整源代码可用）
RUN mvn install -pl shop-recycle-common \
    -DskipTests -B -q \
    -Dmaven.test.skip=true

# 第三层：仅下载依赖（POM 未变时可复用此层）
RUN mvn dependency:go-offline -B -q \
    -pl shop-recycle-order-service \
    -am

# 第四层：复制源代码（变化频繁，但前面的缓存都是热的）
COPY shop-recycle-order-service/ shop-recycle-order-service/

# 第五层：编译（无 clean 保留缓存）
RUN mvn package -DskipTests -B -q \
    -pl shop-recycle-order-service \
    -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-order-service"
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-order-service/target/*.jar order-service.jar

EXPOSE 8081

# Health check (在Alpine中wget比curl更轻量)
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD wget --no-verbose --tries=1 --spider http://localhost:8081/health || exit 1

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