import fs from 'node:fs';
import path from 'node:path';
import express from 'express';
import {
  extractSharePreviewMeta,
  injectOgTags,
  renderWechatSharePreviewHtml,
} from '../mindspace-og-tags.mjs';

export function attachPortalStaticDeliveryRoutes({
  app,
  h5Root,
  host,
  port,
  publishRootDir,
  usersRoot,
  userAuthReady = Promise.resolve(),
  resolveRequestOrigin,
  fetchFn = fetch,
  fsApi = fs,
  pathApi = path,
  staticMiddleware = express.static,
  injectOgTagsFn = injectOgTags,
  extractSharePreviewMetaFn =
    extractSharePreviewMeta,
  renderWechatSharePreviewHtmlFn =
    renderWechatSharePreviewHtml,
} = {}) {
  if (
    !app ||
    !h5Root ||
    !publishRootDir ||
    !usersRoot ||
    typeof resolveRequestOrigin !== 'function' ||
    typeof fetchFn !== 'function' ||
    typeof staticMiddleware !== 'function'
  ) {
    throw new Error(
      'attachPortalStaticDeliveryRoutes requires route dependencies',
    );
  }

  app.use('/temp', (req, res) => {
    res.redirect(
      301,
      `/${publishRootDir}${req.url}`,
    );
  });

  app.use('/user', async (req, res, next) => {
    await userAuthReady;
    const parts = req.path
      .split('/')
      .filter(Boolean);
    if (parts.length < 1) return next();

    const [username, ...rest] = parts;
    const targetDir = pathApi.join(
      usersRoot,
      username,
    );
    const filePath = pathApi.join(
      targetDir,
      ...rest,
    );
    const resolvedRoot =
      pathApi.resolve(targetDir);
    const resolvedPath =
      pathApi.resolve(filePath);

    if (
      !resolvedPath.startsWith(
        resolvedRoot + pathApi.sep,
      ) &&
      resolvedPath !== resolvedRoot
    ) {
      return res
        .status(403)
        .json({ message: '禁止访问' });
    }

    if (!fsApi.existsSync(targetDir)) {
      return res
        .status(404)
        .json({ message: '用户不存在' });
    }
    if (!fsApi.existsSync(resolvedPath)) {
      return res
        .status(404)
        .json({ message: '文件不存在' });
    }

    if (fsApi.statSync(resolvedPath).isDirectory()) {
      const indexPath = pathApi.join(
        resolvedPath,
        'index.html',
      );
      if (fsApi.existsSync(indexPath)) {
        return res.sendFile(indexPath);
      }
      return res
        .status(404)
        .json({
          message: '目录中没有 index.html',
        });
    }

    res.sendFile(resolvedPath, (error) => {
      if (error) {
        res
          .status(404)
          .json({ message: '文件不存在' });
      }
    });
  });

  app.get(
    `/${publishRootDir}/wiki/*`,
    (_req, res) => {
      res.sendFile(
        pathApi.join(
          h5Root,
          publishRootDir,
          'wiki',
          'index.html',
        ),
      );
    },
  );

  app.get('/temp/wiki/*', (req, res) => {
    res.redirect(
      301,
      `/${publishRootDir}/wiki${req.url.slice(
        '/temp/wiki'.length,
      )}`,
    );
  });

  app.use(
    '/plaza-covers',
    staticMiddleware(
      pathApi.join(
        h5Root,
        'public/plaza-covers',
      ),
      { maxAge: '7d' },
    ),
  );
  app.use(
    '/brand',
    staticMiddleware(
      pathApi.join(h5Root, 'public/brand'),
      { maxAge: '7d' },
    ),
  );
  app.use(
    '/assets',
    staticMiddleware(
      pathApi.join(h5Root, 'public/assets'),
      { maxAge: '1d' },
    ),
  );

  app.get(
    '/dev/wechat-share-preview',
    async (req, res) => {
      try {
        const rawTarget = String(
          req.query.url ?? req.query.path ?? '',
        ).trim();
        if (!rawTarget) {
          return res
            .status(400)
            .type('text/plain; charset=utf-8')
            .send(
              '缺少 url 参数，例如 ?url=/MindSpace/john/public/demo.html',
            );
        }
        const origin =
          resolveRequestOrigin(req) ||
          `http://${host}:${port}`;
        const targetUrl = rawTarget.startsWith(
          'http',
        )
          ? new URL(rawTarget)
          : new URL(
              rawTarget.startsWith('/')
                ? rawTarget
                : `/${rawTarget}`,
              origin,
            );
        const upstream = await fetchFn(
          targetUrl.toString(),
          {
            headers: {
              'user-agent':
                req.get('user-agent') ||
                'tkmind-wechat-share-preview',
              accept: 'text/html,*/*',
            },
            redirect: 'follow',
          },
        );
        if (!upstream.ok) {
          return res
            .status(upstream.status)
            .type('text/plain; charset=utf-8')
            .send(
              `页面请求失败：HTTP ${upstream.status}`,
            );
        }
        let html = await upstream.text();
        const pageUrl =
          targetUrl.toString().split('#')[0];
        const pageDirUrl = pageUrl.slice(
          0,
          pageUrl.lastIndexOf('/') + 1,
        );
        html = injectOgTagsFn(html, {
          origin: targetUrl.origin,
          pageUrl,
          pageDirUrl,
        });
        const preview =
          extractSharePreviewMetaFn(html, {
            origin: targetUrl.origin,
            pageUrl,
            pageDirUrl,
          });
        res.set(
          'Content-Type',
          'text/html; charset=utf-8',
        );
        res.set('Cache-Control', 'no-store');
        return res.send(
          renderWechatSharePreviewHtmlFn(
            preview,
            {
              note: '此预览读取页面最终 HTML 中的 Open Graph 标签，可用来对照微信里粘贴链接后的卡片效果。',
            },
          ),
        );
      } catch (error) {
        return res
          .status(500)
          .type('text/plain; charset=utf-8')
          .send(
            String(error?.message ?? error),
          );
      }
    },
  );

  app.use(
    '/dev',
    staticMiddleware(
      pathApi.join(h5Root, 'public/dev'),
      { maxAge: 0 },
    ),
  );

  app.get(
    /^\/MP_verify_[A-Za-z0-9]+\.txt$/,
    (req, res) => {
      const fileName = pathApi.basename(req.path);
      const filePath = pathApi.join(
        h5Root,
        'public',
        fileName,
      );
      if (!fsApi.existsSync(filePath)) {
        return res.status(404).end();
      }
      res
        .type('text/plain')
        .sendFile(filePath);
    },
  );

  app.use('/auth', (_req, res) => {
    res.status(404).json({
      message:
        '接口不存在，请重启后端服务（node server.mjs 或 pnpm dev）',
    });
  });
  app.use('/admin-api', (_req, res) => {
    res.status(404).json({
      message:
        '接口不存在，请重启后端服务（node server.mjs 或 pnpm dev）',
    });
  });

  app.use(
    staticMiddleware(
      pathApi.join(h5Root, 'dist'),
      { index: 'index.html' },
    ),
  );
  app.get('*', (_req, res) => {
    res.sendFile(
      pathApi.join(
        h5Root,
        'dist',
        'index.html',
      ),
    );
  });
}