# 多阶段构建：api-gateway 生产镜像
# 用法：docker build -t edu/api-gateway:latest -f services/api-gateway/Dockerfile .

# ============ Builder ============
FROM golang:1.25-alpine AS builder
WORKDIR /app

# git 与 ca-certificates 为 go mod 下载所需
RUN apk add --no-cache git ca-certificates

# 先拷依赖清单利用缓存（shared-go + api-gateway）
COPY packages/shared-go/go.mod ./packages/shared-go/
COPY services/api-gateway/go.mod services/api-gateway/go.sum ./services/api-gateway/
ENV GOPROXY=https://goproxy.cn,direct
RUN cd services/api-gateway && go mod download

# 拷源码并构建
COPY services/api-gateway ./services/api-gateway
COPY packages/shared-go ./packages/shared-go
RUN cd services/api-gateway && CGO_ENABLED=0 GOOS=linux go build \
    -ldflags="-s -w" \
    -o /app/bin/api-gateway \
    ./main.go

# ============ Runtime ============
FROM alpine:3.20 AS runner
WORKDIR /app

RUN apk add --no-cache ca-certificates tzdata wget

# 非 root 用户
RUN addgroup -g 1001 -S app && adduser -S app -u 1001 -G app

COPY --from=builder /app/bin/api-gateway /app/api-gateway

USER app
EXPOSE 8080

# 健康检查
HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
  CMD wget --quiet --spider http://localhost:8080/healthz || exit 1

ENTRYPOINT ["/app/api-gateway"]