#!/usr/bin/env bash

set -euo pipefail

usage() {
  cat <<'EOF'
用法:
  ./scripts/deploy/production-web-deploy.sh --source-dir build/<version> [--version <version>] [--release-root /opt/genarrative/releases] [--web-link /srv/genarrative/web] [--current-link /opt/genarrative/current]

说明:
  校验 web.tar.gz.sha256 后，把 web.tar.gz 解压到 /opt/genarrative/releases/<version>/web，
  并更新 /srv/genarrative/web 软链接。如果同版本目录已存在 api-server，则同步更新 /opt/genarrative/current。
EOF
}

require_argument() {
  local value="$1"
  local label="$2"

  if [[ -z "${value}" ]]; then
    echo "[production-web-deploy] 缺少参数: ${label}" >&2
    exit 1
  fi
}

SOURCE_DIR=""
VERSION=""
RELEASE_ROOT="/opt/genarrative/releases"
CURRENT_LINK="/opt/genarrative/current"
WEB_LINK="/srv/genarrative/web"

while [[ $# -gt 0 ]]; do
  case "$1" in
    -h|--help)
      usage
      exit 0
      ;;
    --source-dir)
      SOURCE_DIR="${2:?缺少 --source-dir 的值}"
      shift 2
      ;;
    --version)
      VERSION="${2:?缺少 --version 的值}"
      shift 2
      ;;
    --release-root)
      RELEASE_ROOT="${2:?缺少 --release-root 的值}"
      shift 2
      ;;
    --current-link)
      CURRENT_LINK="${2:?缺少 --current-link 的值}"
      shift 2
      ;;
    --web-link)
      WEB_LINK="${2:?缺少 --web-link 的值}"
      shift 2
      ;;
    *)
      echo "[production-web-deploy] 未知参数: $1" >&2
      usage >&2
      exit 1
      ;;
  esac
done

require_argument "${SOURCE_DIR}" "--source-dir"

if [[ ! -d "${SOURCE_DIR}" ]]; then
  echo "[production-web-deploy] 发布目录不存在: ${SOURCE_DIR}" >&2
  exit 1
fi

SOURCE_DIR="$(cd "${SOURCE_DIR}" && pwd)"
VERSION="${VERSION:-$(basename "${SOURCE_DIR}")}"

if [[ ! "${VERSION}" =~ ^[0-9A-Za-z._-]+$ ]]; then
  echo "[production-web-deploy] --version 只能包含数字、字母、点、下划线和短横线: ${VERSION}" >&2
  exit 1
fi

if [[ ! -f "${SOURCE_DIR}/web.tar.gz" || ! -f "${SOURCE_DIR}/web.tar.gz.sha256" ]]; then
  echo "[production-web-deploy] 缺少 web.tar.gz 或 web.tar.gz.sha256: ${SOURCE_DIR}" >&2
  exit 1
fi

echo "[production-web-deploy] 校验 Web 压缩包"
(
  cd "${SOURCE_DIR}"
  sha256sum -c web.tar.gz.sha256
)

RELEASE_DIR="${RELEASE_ROOT}/${VERSION}"
WEB_TARGET="${RELEASE_DIR}/web"
mkdir -p "${RELEASE_DIR}"
rm -rf "${WEB_TARGET}"

echo "[production-web-deploy] 解压 Web 到: ${WEB_TARGET}"
tar -xzf "${SOURCE_DIR}/web.tar.gz" -C "${RELEASE_DIR}"
test -d "${WEB_TARGET}"

if [[ -f "${SOURCE_DIR}/release-manifest.json" ]]; then
  cp "${SOURCE_DIR}/release-manifest.json" "${RELEASE_DIR}/release-manifest.web.json"
fi

mkdir -p "$(dirname "${CURRENT_LINK}")" "$(dirname "${WEB_LINK}")"
ln -sfn "${WEB_TARGET}" "${WEB_LINK}"
if [[ -x "${RELEASE_DIR}/api-server" ]]; then
  ln -sfn "${RELEASE_DIR}" "${CURRENT_LINK}"
else
  echo "[production-web-deploy] ${RELEASE_DIR}/api-server 不存在，仅更新 Web 软链接，保持 current 不变。"
fi

if command -v nginx >/dev/null 2>&1; then
  echo "[production-web-deploy] nginx -t"
  nginx -t
fi

if [[ ! -f "${WEB_TARGET}/index.html" ]]; then
  echo "[production-web-deploy] Web smoke test 失败，缺少 index.html: ${WEB_TARGET}" >&2
  exit 1
fi

echo "[production-web-deploy] 完成: ${WEB_TARGET}"