# 多阶段构建:builder 出静态二进制,runner 极简
# Builder
# 注:go.mod 的 go 指令是 1.26.0(本机 go mod tidy 用 Go 1.27 写入),
# base image 必须 >= 1.26,否则 go mod download 会因 GOTOOLCHAIN=local 失败
FROM golang:1.27-alpine AS builder

# 国内构建场景下可换成 aliyun / tencent 镜像
# RUN sed -i 's|dl-cdn.alpinelinux.org|mirrors.aliyun.com|g' /etc/apk/repositories

# CGO=0 出纯静态二进制,目标 alpine 不用 glibc
ENV CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
    GOPROXY=https://goproxy.cn,direct \
    GOSUMDB=sum.golang.google.cn

WORKDIR /src

# 先拷贝 go.mod/go.sum 利用 Docker layer 缓存
COPY go.mod go.sum ./
RUN go mod download

# 拷贝源码并构建
COPY . .
RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /out/server ./cmd/server

# Runner
FROM alpine:3.20

# 时区(中国用户)+ tini 收僵尸进程
RUN apk add --no-cache ca-certificates tzdata tini && \
    cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && \
    echo "Asia/Shanghai" > /etc/timezone

# 非 root 运行
RUN addgroup -S fuellog && adduser -S -G fuellog fuellog

WORKDIR /app
COPY --from=builder /out/server /app/server

# 数据目录(SQLite)
RUN mkdir -p /data && chown -R fuellog:fuellog /data /app
USER fuellog

ENV SERVER_ADDR=:8080 \
    GIN_MODE=release \
    DB_PATH=/data/fuellog.db \
    TZ=Asia/Shanghai

EXPOSE 8080

# 数据卷挂载点
VOLUME ["/data"]

ENTRYPOINT ["/sbin/tini", "--"]
CMD ["/app/server"]

# 健康检查(用 wget,alpine 自带 busybox;或用 curl apk add)
HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
  CMD wget -q -O- http://127.0.0.1:8080/health > /dev/null || exit 1