#!/usr/bin/env bash

set -euo pipefail

expected_version="${GENARRATIVE_NPM_VERSION:?GENARRATIVE_NPM_VERSION 不能为空}"
if [[ ! "${expected_version}" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
  echo "[jenkins-npm] 非法 npm 版本: ${expected_version}" >&2
  return 1 2>/dev/null || exit 1
fi

if [[ -n "${GENARRATIVE_JENKINS_NPM_PREFIX:-}" ]]; then
  npm_prefix="${GENARRATIVE_JENKINS_NPM_PREFIX}"
else
  npm_home="${HOME:?HOME 不能为空}"
  npm_prefix="${npm_home}/.local/share/genarrative/npm-${expected_version}"
fi

pinned_npm="${npm_prefix}/bin/npm"
actual_version=""
if [[ -x "${pinned_npm}" ]]; then
  actual_version="$("${pinned_npm}" --version 2>/dev/null || true)"
fi

if [[ "${actual_version}" != "${expected_version}" ]]; then
  bootstrap_npm="$(command -v npm || true)"
  if [[ -z "${bootstrap_npm}" ]]; then
    echo "[jenkins-npm] 缺少用于引导固定版本的 npm" >&2
    return 1 2>/dev/null || exit 1
  fi

  echo "[jenkins-npm] 准备 npm ${expected_version} (bootstrap=${bootstrap_npm})"
  mkdir -p "${npm_prefix}"
  "${bootstrap_npm}" install --global --prefix "${npm_prefix}" "npm@${expected_version}" --ignore-scripts --no-audit --no-fund
fi

export PATH="${npm_prefix}/bin:${PATH}"
actual_version="$(npm --version)"
if [[ "${actual_version}" != "${expected_version}" ]]; then
  echo "[jenkins-npm] npm 版本不匹配：期望 ${expected_version}，实际 ${actual_version}" >&2
  return 1 2>/dev/null || exit 1
fi

echo "[jenkins-npm] npm=$(command -v npm) version=${actual_version}"