#!/usr/bin/env bash
set -Eeuo pipefail

SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
IMAGE="${NGINX_IMAGE:-nginx-oneclick:1.28}"
NGINX_VERSION="${NGINX_VERSION:-1.28}"
ARCHIVE="${NGINX_IMAGE_ARCHIVE:-${SCRIPT_DIR}/nginx-oneclick-1.28.tar.gz}"

command -v docker >/dev/null 2>&1 || {
  echo "错误：未找到 Docker，请先安装 Docker。" >&2
  exit 1
}

echo "[1/2] 构建镜像 ${IMAGE}（基础镜像 nginx:${NGINX_VERSION}）"
docker build \
  --pull \
  --build-arg "NGINX_VERSION=${NGINX_VERSION}" \
  --tag "${IMAGE}" \
  "${SCRIPT_DIR}"

echo "[2/2] 导出镜像 ${ARCHIVE}"
mkdir -p "$(dirname -- "${ARCHIVE}")"
tmp_archive="${ARCHIVE}.tmp"
trap 'rm -f -- "${tmp_archive}"' EXIT
docker save "${IMAGE}" | gzip -c >"${tmp_archive}"
mv -f -- "${tmp_archive}" "${ARCHIVE}"

if command -v sha256sum >/dev/null 2>&1; then
  sha256sum "${ARCHIVE}" >"${ARCHIVE}.sha256"
fi

echo
echo "构建完成："
echo "  镜像：${IMAGE}"
echo "  文件：${ARCHIVE}"