// Tauri Windows bundler 的 NSIS 工具链预置。
//
// 背景：`tauri build` 打 Windows NSIS 包时会现场从 GitHub 下载 `nsis-3.11.zip`
// 与 `nsis_tauri_utils.dll`（见 tauri-bundler `bundle/windows/nsis/mod.rs`）。
// 构建机每个检出（`git clean -fdx`）都会丢掉 `target/.tauri` 缓存，于是每次
// 发布都要重新下载；响应一旦被截断，bundler 只会报 `io: unexpected end of file`，
// 整条流水线在 Rust 编译数分钟之后才失败。
//
// 这里在打包前用固定哈希 + 重试预置同一份工具链目录：bundler 检查到必需文件齐全
// 且 `nsis_tauri_utils.dll` 哈希一致后就不会再自行下载。原始归档（两个文件）
// 额外缓存在工作区之外，构建机重复构建时不再依赖 GitHub 连通性。

import { createHash } from 'node:crypto';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

import JSZip from 'jszip';

export const LOG_PREFIX = '[ai-game-creator-shell]';

/** bundler 把工具链解到 `<tools>/.tauri/NSIS`（`bundle.useLocalToolsDir: true`）。 */
export const NSIS_TOOLSET_DIR_NAME = 'NSIS';

export const NSIS_ARCHIVE_ASSET_NAME = 'nsis-3.11.zip';
export const NSIS_ARCHIVE_URL =
  'https://github.com/tauri-apps/binary-releases/releases/download/nsis-3.11/nsis-3.11.zip';
export const NSIS_ARCHIVE_SHA1 = 'ef7ff767e5cbd9edd22add3a32c9b8f4500bb10d';
export const NSIS_ARCHIVE_TOP_LEVEL_DIR = 'nsis-3.11';

export const NSIS_TAURI_UTILS_ASSET_NAME = 'nsis_tauri_utils.dll';
export const NSIS_TAURI_UTILS_URL =
  'https://github.com/tauri-apps/nsis-tauri-utils/releases/download/nsis_tauri_utils-v0.5.3/nsis_tauri_utils.dll';
export const NSIS_TAURI_UTILS_SHA1 = '75197fee3c6a814fe035788d1c34ead39349b860';
export const NSIS_TAURI_UTILS_REQUIRED_FILE =
  'Plugins/x86-unicode/additional/nsis_tauri_utils.dll';

/**
 * 与 tauri-bundler 2.9.x 的 `NSIS_REQUIRED_FILES` 逐条对齐：少一条 bundler 就会
 * 删掉整个目录重新下载，等于预置失效。升级 `@tauri-apps/cli` 时要同步核对。
 */
export const NSIS_REQUIRED_FILES = [
  'makensis.exe',
  'Bin/makensis.exe',
  'Stubs/lzma-x86-unicode',
  'Stubs/lzma_solid-x86-unicode',
  NSIS_TAURI_UTILS_REQUIRED_FILE,
  'Include/MUI2.nsh',
  'Include/FileFunc.nsh',
  'Include/x64.nsh',
  'Include/nsDialogs.nsh',
  'Include/WinMessages.nsh',
  'Include/Win/COM.nsh',
  'Include/Win/Propkey.nsh',
  'Include/Win/RestartManager.nsh',
];

/** 需要预置的原始归档；测试可注入同结构描述替换其中的地址与哈希。 */
export const NSIS_ASSETS = [
  {
    assetName: NSIS_ARCHIVE_ASSET_NAME,
    url: NSIS_ARCHIVE_URL,
    sha1: NSIS_ARCHIVE_SHA1,
  },
  {
    assetName: NSIS_TAURI_UTILS_ASSET_NAME,
    url: NSIS_TAURI_UTILS_URL,
    sha1: NSIS_TAURI_UTILS_SHA1,
  },
];

const DEFAULT_DOWNLOAD_ATTEMPTS = 4;
const DEFAULT_RETRY_DELAY_MS = 3000;
const DEFAULT_DOWNLOAD_TIMEOUT_MS = 180_000;

export function defaultAppRoot() {
  return fileURLToPath(new URL('..', import.meta.url));
}

export function resolveTauriToolsDir(appRoot = defaultAppRoot()) {
  // 必须与 `src-tauri/tauri.windows.conf.json` 的 `bundle.useLocalToolsDir: true`
  // 保持一致，否则预置的文件不在 bundler 的查找路径上。
  return path.join(appRoot, 'src-tauri', 'target', '.tauri');
}

export function resolveNsisCacheDir(
  env = process.env,
  platform = process.platform,
) {
  const explicit = env.AGC_TAURI_NSIS_CACHE_DIR?.trim();
  if (explicit) return path.resolve(explicit);
  // Jenkins Windows 节点以 SYSTEM 运行，ProgramData 稳定可写且不受工作区清理影响；
  // 缓存里只有待解压的原始归档，不会从该目录执行任何程序。
  if (platform === 'win32') {
    const programData = env.ProgramData?.trim() || 'C:\\ProgramData';
    return path.join(programData, 'genarrative', 'tauri-nsis-cache');
  }
  return path.join(os.homedir(), '.cache', 'genarrative', 'tauri-nsis-cache');
}

/** 与 tauri-bundler 相同的镜像开关语义，便于构建机绕过不可达的 GitHub。 */
export function resolveDownloadUrl(url, env = process.env) {
  if (!url.startsWith('https://github.com/')) return url;
  const template = env.TAURI_BUNDLER_TOOLS_GITHUB_MIRROR_TEMPLATE?.trim();
  const match =
    /^https:\/\/github\.com\/([^/]+)\/([^/]+)\/releases\/download\/([^/]+)\/(.+)$/u.exec(
      url,
    );
  if (template && match) {
    return template
      .replaceAll('<owner>', match[1])
      .replaceAll('<repo>', match[2])
      .replaceAll('<version>', match[3])
      .replaceAll('<asset>', match[4]);
  }
  const base = env.TAURI_BUNDLER_TOOLS_GITHUB_MIRROR?.trim();
  if (base) return `${base.replace(/\/+$/u, '')}/${url}`;
  return url;
}

export function sha1Of(data) {
  return createHash('sha1').update(data).digest('hex');
}

function sha1OfFile(filePath) {
  try {
    return sha1Of(fs.readFileSync(filePath));
  } catch {
    return null;
  }
}

export function verifyNsisToolset(
  nsisDir,
  { utilsSha1 = NSIS_TAURI_UTILS_SHA1 } = {},
) {
  const missing = NSIS_REQUIRED_FILES.filter(
    (relativePath) => !fs.existsSync(path.join(nsisDir, relativePath)),
  );
  const hashMismatch =
    missing.length === 0 &&
    sha1OfFile(path.join(nsisDir, NSIS_TAURI_UTILS_REQUIRED_FILE)) !==
      utilsSha1;
  return { ok: missing.length === 0 && !hashMismatch, missing, hashMismatch };
}

/** 解析 zip 条目落盘位置，并拒绝 `../` 这类越界路径。 */
export function resolveArchiveEntryTarget(rootDir, entryName) {
  const root = path.resolve(rootDir);
  const target = path.resolve(root, entryName);
  if (target !== root && !target.startsWith(`${root}${path.sep}`)) {
    throw new Error(`NSIS 归档包含越界路径：${entryName}`);
  }
  return target;
}

function sleep(ms) {
  return new Promise((resolve) => {
    setTimeout(resolve, ms);
  });
}

async function downloadBuffer(url, { fetchImpl, timeoutMs }) {
  const response = await fetchImpl(url, {
    redirect: 'follow',
    signal: AbortSignal.timeout(timeoutMs),
  });
  if (!response.ok) {
    throw new Error(`HTTP ${response.status} ${response.statusText}`.trim());
  }
  const data = Buffer.from(await response.arrayBuffer());
  if (data.length === 0) throw new Error('响应为空');
  return data;
}

async function downloadVerifiedAsset({
  assetName,
  url,
  sha1,
  env,
  fetchImpl,
  attempts,
  retryDelayMs,
  timeoutMs,
  logger,
}) {
  const downloadUrl = resolveDownloadUrl(url, env);
  let lastError;
  for (let attempt = 1; attempt <= attempts; attempt += 1) {
    try {
      const data = await downloadBuffer(downloadUrl, { fetchImpl, timeoutMs });
      const actual = sha1Of(data);
      if (actual !== sha1) {
        throw new Error(`SHA1 不匹配（期望 ${sha1}，实际 ${actual}）`);
      }
      logger.log(
        `${LOG_PREFIX} NSIS 工具链：已下载 ${assetName}（${data.length} 字节，第 ${attempt} 次尝试）`,
      );
      return data;
    } catch (error) {
      lastError = error;
      logger.warn(
        `${LOG_PREFIX} NSIS 工具链：下载 ${assetName} 失败（第 ${attempt}/${attempts} 次）：${error.message}`,
      );
      if (attempt < attempts) await sleep(retryDelayMs * attempt);
    }
  }
  throw new Error(
    `下载 ${assetName} 失败（已重试 ${attempts} 次）：${lastError?.message ?? '未知错误'}\n` +
      `下载地址：${downloadUrl}\n` +
      `可先把该文件放入缓存目录（AGC_TAURI_NSIS_CACHE_DIR）或配置 ` +
      `TAURI_BUNDLER_TOOLS_GITHUB_MIRROR_TEMPLATE 后重试。`,
  );
}

async function ensureCachedAsset(options) {
  const { assetName, sha1, cacheDir, logger } = options;
  const cachePath = path.join(cacheDir, assetName);
  if (sha1OfFile(cachePath) === sha1) {
    logger.log(`${LOG_PREFIX} NSIS 工具链：命中缓存 ${cachePath}`);
    return cachePath;
  }
  if (fs.existsSync(cachePath)) {
    logger.warn(
      `${LOG_PREFIX} NSIS 工具链：缓存文件校验失败，重新下载 ${cachePath}`,
    );
  }
  const data = await downloadVerifiedAsset(options);
  fs.mkdirSync(cacheDir, { recursive: true });
  const tempPath = `${cachePath}.tmp-${process.pid}`;
  fs.writeFileSync(tempPath, data);
  fs.rmSync(cachePath, { force: true });
  fs.renameSync(tempPath, cachePath);
  return cachePath;
}

export async function extractNsisArchive(archivePath, destinationDir) {
  const archive = await JSZip.loadAsync(fs.readFileSync(archivePath));
  for (const [entryName, entry] of Object.entries(archive.files)) {
    if (entry.dir) continue;
    const target = resolveArchiveEntryTarget(destinationDir, entryName);
    fs.mkdirSync(path.dirname(target), { recursive: true });
    fs.writeFileSync(target, await entry.async('nodebuffer'));
  }
}

/**
 * 预置 `target/.tauri/NSIS`：已就绪时零网络直接返回，否则用缓存或重试下载补齐。
 * 返回结构用于测试与日志，不参与发布产物。
 */
export async function ensureNsisToolset({
  appRoot = defaultAppRoot(),
  toolsDir = resolveTauriToolsDir(appRoot),
  cacheDir = resolveNsisCacheDir(process.env),
  env = process.env,
  fetchImpl = globalThis.fetch,
  assets = NSIS_ASSETS,
  attempts = DEFAULT_DOWNLOAD_ATTEMPTS,
  retryDelayMs = DEFAULT_RETRY_DELAY_MS,
  timeoutMs = DEFAULT_DOWNLOAD_TIMEOUT_MS,
  logger = console,
} = {}) {
  const nsisDir = path.join(toolsDir, NSIS_TOOLSET_DIR_NAME);
  // 生产路径下这里恒等于 bundler 固定的 `nsis_tauri_utils.dll` SHA1；测试注入
  // 自己的归档描述时，校验口径必须与被注入的资产一致。
  const missingAsset = [
    NSIS_ARCHIVE_ASSET_NAME,
    NSIS_TAURI_UTILS_ASSET_NAME,
  ].find((assetName) => !assets.some((asset) => asset.assetName === assetName));
  if (missingAsset) throw new Error(`NSIS 资产描述缺少 ${missingAsset}`);
  const utilsSha1 =
    assets.find((asset) => asset.assetName === NSIS_TAURI_UTILS_ASSET_NAME)
      ?.sha1 ?? NSIS_TAURI_UTILS_SHA1;
  const existing = verifyNsisToolset(nsisDir, { utilsSha1 });
  if (existing.ok) {
    logger.log(`${LOG_PREFIX} NSIS 工具链已就绪：${nsisDir}`);
    return { nsisDir, toolsDir, cacheDir, reused: true, downloaded: [] };
  }
  logger.log(
    `${LOG_PREFIX} NSIS 工具链需要预置：${nsisDir}` +
      (existing.missing.length > 0
        ? `（缺少 ${existing.missing.length} 个文件）`
        : '（哈希不符）'),
  );

  const downloadOptions = {
    env,
    fetchImpl,
    attempts,
    retryDelayMs,
    timeoutMs,
    cacheDir,
    logger,
  };
  const assetPaths = {};
  for (const asset of assets) {
    assetPaths[asset.assetName] = await ensureCachedAsset({
      ...asset,
      ...downloadOptions,
    });
  }

  fs.rmSync(nsisDir, { recursive: true, force: true });
  await extractNsisArchive(assetPaths[NSIS_ARCHIVE_ASSET_NAME], toolsDir);
  const extractedDir = path.join(toolsDir, NSIS_ARCHIVE_TOP_LEVEL_DIR);
  if (!fs.existsSync(extractedDir)) {
    throw new Error(
      `NSIS 归档结构不符合预期：${assetPaths[NSIS_ARCHIVE_ASSET_NAME]} 未解出 ${NSIS_ARCHIVE_TOP_LEVEL_DIR}`,
    );
  }
  fs.renameSync(extractedDir, nsisDir);

  const utilsTarget = path.join(nsisDir, NSIS_TAURI_UTILS_REQUIRED_FILE);
  fs.mkdirSync(path.dirname(utilsTarget), { recursive: true });
  fs.copyFileSync(assetPaths[NSIS_TAURI_UTILS_ASSET_NAME], utilsTarget);

  const installed = verifyNsisToolset(nsisDir, { utilsSha1 });
  if (!installed.ok) {
    throw new Error(
      `NSIS 工具链预置不完整：缺少 ${installed.missing.join(', ') || '无'}；` +
        `哈希不符=${installed.hashMismatch}`,
    );
  }
  logger.log(`${LOG_PREFIX} NSIS 工具链预置完成：${nsisDir}`);
  return {
    nsisDir,
    toolsDir,
    cacheDir,
    reused: false,
    downloaded: assets.map((asset) => asset.assetName),
  };
}

/** `buildRelease` 用：只在 Windows 目标且需要打包时预置 NSIS 工具链。 */
export async function prepareNsisToolsetForRelease(
  context,
  { bundling = true, ...deps } = {},
) {
  if (!bundling || !context.target.includes('windows')) return null;
  return ensureNsisToolset(deps);
}