import { RequestHandler } from 'express';
import { sendError, sendSuccess } from '@/napcat-webui-backend/src/utils/response';
import { PluginStoreList } from '@/napcat-webui-backend/src/types/PluginStore';
import * as fs from 'fs';
import * as path from 'path';
import { pipeline } from 'stream/promises';
import { createWriteStream } from 'fs';
import compressing from 'compressing';
import { findAvailableDownloadUrl, GITHUB_RAW_MIRRORS } from 'napcat-common/src/mirror';
import { webUiPathWrapper } from '@/napcat-webui-backend/index';
import { WebUiDataRuntime } from '@/napcat-webui-backend/src/helper/Data';
import { NapCatOneBot11Adapter } from '@/napcat-onebot/index';
import { OB11PluginMangerAdapter } from '@/napcat-onebot/network/plugin-manger';

// Helper to get the plugin manager adapter
const getPluginManager = (): OB11PluginMangerAdapter | null => {
  const ob11 = WebUiDataRuntime.getOneBotContext() as NapCatOneBot11Adapter;
  if (!ob11) return null;
  return ob11.networkManager.findSomeAdapter('plugin_manager') as OB11PluginMangerAdapter;
};

// 插件商店源配置
const PLUGIN_STORE_SOURCES = [
  'https://raw.githubusercontent.com/NapNeko/napcat-plugin-index/main/plugins.v4.json',
];

// 插件目录 - 使用 pathWrapper
const getPluginsDir = () => webUiPathWrapper.pluginPath;

/**
 * 验证插件 ID，防止路径注入攻击
 */
function validatePluginId (id: any): string {
  if (typeof id !== 'string') {
    throw new Error('Invalid plugin ID');
  }
  // 仅允许字母、数字、点、下划线、连字符，禁止路径遍历字符
  // 通过 path.basename 进一步确保不包含路径分隔符
  const safeId = path.basename(id);
  if (!/^[a-zA-Z0-9._-]+$/.test(safeId) || safeId !== id) {
    throw new Error('Invalid plugin ID format');
  }
  return safeId;
}

// 插件列表缓存
let pluginListCache: PluginStoreList | null = null;
let cacheTimestamp: number = 0;
const CACHE_TTL = 10 * 60 * 1000; // 10分钟缓存

/**
 * 从多个源获取插件列表，使用镜像系统
 * 带10分钟缓存，支持强制刷新
 */
async function fetchPluginList (forceRefresh: boolean = false): Promise<PluginStoreList> {
  // 检查缓存（如果不是强制刷新）
  const now = Date.now();
  if (!forceRefresh && pluginListCache && (now - cacheTimestamp) < CACHE_TTL) {
    // console.log('Using cached plugin list');
    return pluginListCache;
  }

  const errors: string[] = [];

  for (const source of PLUGIN_STORE_SOURCES) {
    // 使用镜像系统的 raw 镜像列表
    for (const mirror of GITHUB_RAW_MIRRORS) {
      try {
        const url = mirror ? `${mirror}/${source.replace('https://raw.githubusercontent.com/', '')}` : source;

        const response = await fetch(url, {
          headers: {
            'User-Agent': 'NapCat-WebUI',
          },
          signal: AbortSignal.timeout(10000), // 10秒超时
        });

        if (!response.ok) {
          throw new Error(`HTTP ${response.status}: ${response.statusText}`);
        }

        const data = await response.json();
        // console.log(`Successfully fetched plugin list from: ${url}`);

        // 更新缓存
        pluginListCache = data as PluginStoreList;
        cacheTimestamp = now;

        return pluginListCache;
      } catch (e: any) {
        const errorMsg = `Failed to fetch from ${source} via mirror: ${e.message}`;
        console.warn(errorMsg);
        errors.push(errorMsg);
      }
    }
  }

  throw new Error(`All plugin sources failed:\n${errors.join('\n')}`);
}

/**
 * 下载文件，使用镜像系统
 * 自动识别 GitHub Release URL 并使用镜像加速
 */
async function downloadFile (
  url: string,
  destPath: string,
  customMirror?: string,
  onProgress?: (percent: number, downloaded: number, total: number, speed: number) => void,
  timeout: number = 120000 // 默认120秒超时
): Promise<void> {
  try {
    let downloadUrl: string;

    // 判断是否是 GitHub Release URL
    // 格式: https://github.com/{owner}/{repo}/releases/download/{tag}/{filename}
    const githubReleasePattern = /^https:\/\/github\.com\/[^/]+\/[^/]+\/releases\/download\//;

    if (githubReleasePattern.test(url)) {
      // 使用镜像系统查找可用的下载 URL（支持 GitHub Release 镜像）
      console.log(`Detected GitHub Release URL: ${url}`);
      console.log(`Custom mirror: ${customMirror || 'auto'}`);

      downloadUrl = await findAvailableDownloadUrl(url, {
        validateContent: false, // 不验证内容，只检查状态码和 Content-Type
        timeout: 5000, // 每个镜像测试5秒超时
        useFastMirrors: false, // 不使用快速镜像列表（避免测速阻塞）
        customMirror: customMirror || undefined, // 使用用户选择的镜像
      });

      console.log(`Selected download URL: ${downloadUrl}`);
    } else {
      // 其他URL直接下载
      console.log(`Direct download URL: ${url}`);
      downloadUrl = url;
    }

    console.log(`Starting download from: ${downloadUrl}`);

    // 确保目标目录存在
    const destDir = path.dirname(destPath);
    if (!fs.existsSync(destDir)) {
      fs.mkdirSync(destDir, { recursive: true });
      console.log(`Created directory: ${destDir}`);
    }

    const response = await fetch(downloadUrl, {
      headers: {
        'User-Agent': 'NapCat-WebUI',
      },
      signal: AbortSignal.timeout(timeout), // 使用传入的超时时间
    });

    if (!response.ok) {
      throw new Error(`HTTP ${response.status}: ${response.statusText}`);
    }

    if (!response.body) {
      throw new Error('Response body is null');
    }

    const totalLength = Number(response.headers.get('content-length')) || 0;

    // 初始进度通知
    if (onProgress) {
      onProgress(0, 0, totalLength, 0);
    }

    let downloaded = 0;
    let lastTime = Date.now();
    let lastDownloaded = 0;

    // 进度监控流
    // eslint-disable-next-line @stylistic/generator-star-spacing
    const progressMonitor = async function* (source: any) {
      for await (const chunk of source) {
        downloaded += chunk.length;
        const now = Date.now();
        const elapsedSinceLast = now - lastTime;

        // 每隔 500ms 或完成时计算一次速度并更新进度
        if (elapsedSinceLast >= 500 || (totalLength && downloaded === totalLength)) {
          const percent = totalLength ? Math.round((downloaded / totalLength) * 100) : 0;
          const speed = (downloaded - lastDownloaded) / (elapsedSinceLast / 1000); // bytes/s

          if (onProgress) {
            onProgress(percent, downloaded, totalLength, speed);
          }

          lastTime = now;
          lastDownloaded = downloaded;
        }

        yield chunk;
      }
    };

    // 写入文件
    const fileStream = createWriteStream(destPath);
    await pipeline(progressMonitor(response.body), fileStream);

    console.log(`Successfully downloaded to: ${destPath}`);
  } catch (e: any) {
    // 删除可能的不完整文件
    if (fs.existsSync(destPath)) {
      fs.unlinkSync(destPath);
    }
    throw new Error(`Download failed: ${e.message}`);
  }
}

/**
 * 解压插件到指定目录
 */
async function extractPlugin (zipPath: string, pluginId: string): Promise<void> {
  // 验证 pluginId 确保安全
  const safeId = validatePluginId(pluginId);
  const PLUGINS_DIR = getPluginsDir();
  const pluginDir = path.join(PLUGINS_DIR, safeId);
  const dataDir = path.join(pluginDir, 'data');
  const tempDataDir = path.join(PLUGINS_DIR, `${safeId}.data.backup`);

  console.log(`[extractPlugin] PLUGINS_DIR: ${PLUGINS_DIR}`);
  console.log(`[extractPlugin] pluginId: ${safeId}`);
  console.log(`[extractPlugin] Target directory: ${pluginDir}`);
  console.log(`[extractPlugin] Zip file: ${zipPath}`);

  // 确保插件根目录存在
  if (!fs.existsSync(PLUGINS_DIR)) {
    fs.mkdirSync(PLUGINS_DIR, { recursive: true });
    console.log(`[extractPlugin] Created plugins root directory: ${PLUGINS_DIR}`);
  }

  // 如果目录已存在，先备份 data 文件夹，再删除
  let hasDataBackup = false;
  if (fs.existsSync(pluginDir)) {
    // 备份 data 文件夹
    if (fs.existsSync(dataDir)) {
      console.log(`[extractPlugin] Backing up data directory: ${dataDir}`);
      if (fs.existsSync(tempDataDir)) {
        fs.rmSync(tempDataDir, { recursive: true, force: true });
      }
      fs.renameSync(dataDir, tempDataDir);
      hasDataBackup = true;
    }

    console.log(`[extractPlugin] Directory exists, removing: ${pluginDir}`);
    fs.rmSync(pluginDir, { recursive: true, force: true });
  }

  // 创建插件目录
  fs.mkdirSync(pluginDir, { recursive: true });
  console.log(`[extractPlugin] Created directory: ${pluginDir}`);

  try {
    // 解压
    await compressing.zip.uncompress(zipPath, pluginDir);

    console.log(`[extractPlugin] Plugin extracted to: ${pluginDir}`);

    // 恢复 data 文件夹
    if (hasDataBackup && fs.existsSync(tempDataDir)) {
      // 如果新版本也有 data 文件夹，先删除
      if (fs.existsSync(dataDir)) {
        fs.rmSync(dataDir, { recursive: true, force: true });
      }
      console.log(`[extractPlugin] Restoring data directory: ${dataDir}`);
      fs.renameSync(tempDataDir, dataDir);
    }
  } catch (e) {
    // 解压失败时，尝试恢复 data 文件夹
    if (hasDataBackup && fs.existsSync(tempDataDir)) {
      console.log('[extractPlugin] Extract failed, restoring data directory');
      if (!fs.existsSync(pluginDir)) {
        fs.mkdirSync(pluginDir, { recursive: true });
      }
      if (fs.existsSync(dataDir)) {
        fs.rmSync(dataDir, { recursive: true, force: true });
      }
      fs.renameSync(tempDataDir, dataDir);
    }
    throw e;
  }

  // 列出解压后的文件
  const files = fs.readdirSync(pluginDir);
  console.log('[extractPlugin] Extracted files:', files);
}

/**
 * 获取插件商店列表
 */
export const GetPluginStoreListHandler: RequestHandler = async (req, res) => {
  try {
    // 支持 forceRefresh 查询参数强制刷新缓存
    const forceRefresh = req.query['forceRefresh'] === 'true';
    const data = await fetchPluginList(forceRefresh);
    return sendSuccess(res, data);
  } catch (e: any) {
    return sendError(res, 'Failed to fetch plugin store list: ' + e.message);
  }
};

/**
 * 获取单个插件详情
 */
export const GetPluginStoreDetailHandler: RequestHandler = async (req, res) => {
  try {
    const id = validatePluginId(req.params['id']);
    const data = await fetchPluginList();
    const plugin = data.plugins.find(p => p.id === id);

    if (!plugin) {
      return sendError(res, 'Plugin not found');
    }

    return sendSuccess(res, plugin);
  } catch (e: any) {
    return sendError(res, 'Failed to fetch plugin detail: ' + e.message);
  }
};

/**
 * 安装插件（从商店）- 普通 POST 接口
 */
export const InstallPluginFromStoreHandler: RequestHandler = async (req, res) => {
  try {
    const { id: rawId, mirror } = req.body;

    if (!rawId) {
      return sendError(res, 'Plugin ID is required');
    }

    const id = validatePluginId(rawId);

    // 获取插件信息
    const data = await fetchPluginList();
    const plugin = data.plugins.find(p => p.id === id);

    if (!plugin) {
      return sendError(res, 'Plugin not found in store');
    }

    // 检查是否已安装相同版本
    const pm = getPluginManager();
    if (pm) {
      const installedInfo = pm.getPluginInfo(id);
      if (installedInfo && installedInfo.version === plugin.version) {
        return sendError(res, '该插件已安装且版本相同，无需重复安装');
      }
    }

    // 下载插件
    const PLUGINS_DIR = getPluginsDir();
    const tempZipPath = path.join(PLUGINS_DIR, `${id}.temp.zip`);

    try {
      await downloadFile(plugin.downloadUrl, tempZipPath, mirror, undefined, 300000);

      // 解压插件
      await extractPlugin(tempZipPath, id);

      // 删除临时文件
      fs.unlinkSync(tempZipPath);

      // 如果 pluginManager 存在，立即注册或重载插件
      const pluginManager = getPluginManager();
      if (pluginManager) {
        // 如果插件已存在，则重载以刷新版本信息；否则注册新插件
        if (pluginManager.getPluginInfo(id)) {
          await pluginManager.reloadPlugin(id);
        } else {
          await pluginManager.loadPluginById(id);
        }
      }

      return sendSuccess(res, {
        message: 'Plugin installed successfully',
        plugin,
        installPath: path.join(PLUGINS_DIR, id),
      });
    } catch (downloadError: any) {
      // 清理临时文件
      if (fs.existsSync(tempZipPath)) {
        fs.unlinkSync(tempZipPath);
      }
      throw downloadError;
    }
  } catch (e: any) {
    return sendError(res, 'Failed to install plugin: ' + e.message);
  }
};

/**
 * 安装插件（从商店）- SSE 版本，实时推送进度
 */
export const InstallPluginFromStoreSSEHandler: RequestHandler = async (req, res) => {
  const { id: rawId, mirror } = req.query;

  if (!rawId || typeof rawId !== 'string') {
    res.status(400).json({ error: 'Plugin ID is required' });
    return;
  }

  let id: string;
  try {
    id = validatePluginId(rawId);
  } catch (err: any) {
    res.status(400).json({ error: err.message });
    return;
  }

  // 设置 SSE 响应头
  res.setHeader('Content-Type', 'text/event-stream');
  res.setHeader('Cache-Control', 'no-cache');
  res.setHeader('Connection', 'keep-alive');
  res.flushHeaders();

  const sendProgress = (message: string, progress?: number, detail?: any) => {
    res.write(`data: ${JSON.stringify({ message, progress, ...detail })}\n\n`);
  };

  try {
    sendProgress('正在获取插件信息...', 10);

    // 获取插件信息
    const data = await fetchPluginList();
    const plugin = data.plugins.find(p => p.id === id);

    if (!plugin) {
      sendProgress('错误: 插件不存在', 0);
      res.write(`data: ${JSON.stringify({ error: 'Plugin not found in store' })}\n\n`);
      res.end();
      return;
    }

    // 检查是否已安装相同版本
    const pm = getPluginManager();
    if (pm) {
      const installedInfo = pm.getPluginInfo(id);
      if (installedInfo && installedInfo.version === plugin.version) {
        sendProgress('错误: 该插件已安装且版本相同', 0);
        res.write(`data: ${JSON.stringify({ error: '该插件已安装且版本相同，无需重复安装' })}\n\n`);
        res.end();
        return;
      }
    }

    sendProgress(`找到插件: ${plugin.name} v${plugin.version}`, 20);
    sendProgress(`下载地址: ${plugin.downloadUrl}`, 25);

    if (mirror && typeof mirror === 'string') {
      sendProgress(`使用镜像: ${mirror}`, 28);
    }

    // 下载插件
    const PLUGINS_DIR = getPluginsDir();
    const tempZipPath = path.join(PLUGINS_DIR, `${id}.temp.zip`);

    try {
      sendProgress('正在下载插件...', 30);
      await downloadFile(plugin.downloadUrl, tempZipPath, mirror as string | undefined, (percent, downloaded, total, speed) => {
        const overallProgress = 30 + Math.round(percent * 0.5);
        const downloadedMb = (downloaded / 1024 / 1024).toFixed(1);
        const totalMb = total ? (total / 1024 / 1024).toFixed(1) : '?';
        const speedMb = (speed / 1024 / 1024).toFixed(2);
        const eta = (total > 0 && speed > 0) ? Math.round((total - downloaded) / speed) : -1;

        sendProgress(`正在下载插件... ${percent}%`, overallProgress, {
          downloaded,
          total,
          speed,
          eta,
          downloadedStr: `${downloadedMb}MB`,
          totalStr: `${totalMb}MB`,
          speedStr: `${speedMb}MB/s`,
        });
      }, 300000);

      sendProgress('下载完成，正在解压...', 85);
      await extractPlugin(tempZipPath, id);

      sendProgress('解压完成，正在清理...', 95);
      fs.unlinkSync(tempZipPath);

      // 如果 pluginManager 存在，立即注册或重载插件
      const pluginManager = getPluginManager();
      if (pluginManager) {
        // 如果插件已存在，则重载以刷新版本信息；否则注册新插件
        if (pluginManager.getPluginInfo(id)) {
          sendProgress('正在刷新插件信息...', 95);
          await pluginManager.reloadPlugin(id);
        } else {
          sendProgress('正在注册插件...', 95);
          await pluginManager.loadPluginById(id);
        }
      }

      sendProgress('安装成功！', 100);
      res.write(`data: ${JSON.stringify({
        success: true,
        message: 'Plugin installed successfully',
        plugin,
        installPath: path.join(PLUGINS_DIR, id),
      })}\n\n`);
      res.end();
    } catch (downloadError: any) {
      // 清理临时文件
      if (fs.existsSync(tempZipPath)) {
        fs.unlinkSync(tempZipPath);
      }
      sendProgress(`错误: ${downloadError.message}`, 0);
      res.write(`data: ${JSON.stringify({ error: downloadError.message })}\n\n`);
      res.end();
    }
  } catch (e: any) {
    sendProgress(`错误: ${e.message}`, 0);
    res.write(`data: ${JSON.stringify({ error: e.message })}\n\n`);
    res.end();
  }
};