const express = require('express');
const axios = require('axios');
const app = express();
const serve = require('./vercel-serve');
const path = require('path');
const glob = require('glob');
const matter = require('gray-matter');
const ejs = require('ejs');
const helpers = require('../views/helpers/functions');

// Port number for HTTP server
const port = process.env.PORT||3000;

// Solr instance URL
const solrUrl = 'http://solr.services.cleveland.daball.me:8983/solr/my_core';

// Set EJS as the view engine
app.set('view engine', 'ejs');

// Specify the views directory
app.set('views', path.join(__dirname, '..', 'views'));

// Middleware to parse JSON request body
app.use(express.json());

// Middleware to rewrite requests
//app.use(rewriter);

// // Serve static files (CSS, JavaScript, images, etc.)
// app.use(serve('../public', {
//   dotfiles: 'ignore',
//   index: false,
// }));

// app.get('/', (req, res) => {
//   res.send('Hello World!');
// })

// Endpoints for all the site's pages.
glob.globSync('pages/**/*.md', {
  cwd: path.join(__dirname, '..'),
  matchBase: true,
  follow: true,
}).forEach((filePath) => {
  const expressRoutePathFromFilePath = (filePath) => {
    return filePath.substring('pages'.length, filePath.length - path.extname(filePath).length).replaceAll(path.sep, path.posix.sep);
  };
  const route = expressRoutePathFromFilePath(filePath);
  const fullFilePath = path.join(__dirname, '..', filePath);
  let paths = route.split(path.posix.sep);
  paths[0] = 'public';
  app.get(route, async (req, res) => {
    const fm = matter.read(fullFilePath);
    const fmData = { fm: fm.data, excerpt: fm.excerpt };
    const content = helpers.md.render(fm.content, fmData );
    const renderData = { content, route, filePath, fullFilePath, req, paths, ...fmData };
    res.render("page", { h: helpers, ...renderData });
  });
});

// Search endpoint
app.get('/search', async (req, res) => {
  // Extract search query from request query parameters
  let { q, page = 1, pageSize = 10 } = req.query;
  pageSize = Math.min(pageSize, 100); // cap at 100
  const query = q;
  // Calculate start offset for pagination
  const start = (page - 1) * pageSize;

  // Sanitize search query to prevent code injection
  const sanitizedQuery = sanitizeQuery(query);
  try {
    // Validate search query
    if (!query) {
      //return res.status(400).json({ error: 'q parameter is required' });
      res.render('search-error', { h: helpers, query: sanitizedQuery, error: { code: 400, message: 'Search query is required.'} });
    }

    // Send search query to Solr
    const response = await axios.get(solrUrl + '/select', {
      params: {
        q: `text:${sanitizedQuery}`, // Query string with field name
        hl: 'true',
        'hl.method': 'unified',
        'hl.fl': '*',
        'hl.snippets': 5,
        'hl.tag.pre': '<strong class=\"result-highlight\">',
        'hl.tag.post': '</strong>',
        'hl.usePhraseHighlighter': true,
        start, // Start offset for pagination
        rows: 10, // Number of rows to return
        wt: 'json', // Response format (JSON)
      },
    });

    // Extract search results from Solr response
    const searchResults = response.data.response.docs;
    const highlightedSnippets = response.data.highlighting;

    // Calculate total number of results (needed for pagination)
    const totalResults = response.data.response.numFound;

    // Calculate total number of pages
    const totalPages = Math.ceil(totalResults / pageSize);

    // Send search results as JSON response
    //res.json('search-results', { query, searchResults, highlightedSnippets, page, pageSize, totalResults, totalPages });
    res.render('search-results', { h: helpers, query: sanitizedQuery, searchResults, highlightedSnippets, page, pageSize, totalResults, totalPages });
  } catch (error) {
    // console.error('Error searching Solr:', error.message);
    // res.status(500).json({ error: 'Internal server error' });
    res.render('search-error', { h: helpers, query: sanitizedQuery, error });
  }
});

// Function to sanitize search query to prevent code injection
function sanitizeQuery(query) {
  // Remove any characters that are not alphanumeric or whitespace
  return query.replace(/[^\w\s*,."]/gi, '');
}

//app.get('/OCR-Encoded-PDFs/Russell-County-Web-Site_2024-02-13_19_50_Modified-With-OCR-Encoding**', rewriter.rewrite('/Web_Site_Archives/Russell_County_Web_Site-2024-02-13_19_50_Modified_With_OCR_Encoding/$1'));

app.get('*', async (req, res) => {
  await serve(req, res, {
    public: path.join(__dirname, '..', 'public'),
    symlinks: true,
    trailingSlash: true,
    cleanUrls: false,
    renderSingle: false,
    unlisted: [
      ".DS_Store",
      ".git",
      "README*"
    ],
    redirects: [
      {
        source: "/:year(\d{4})-:mo(\d{2})-:dd(\d{2})_:hh(\d{2})_:mm(\d{2})/",
        destination: "/Web_Site_Archives/Russell_County_Web_Site-:year-:mo-:dd_:hh_:mm/"
      },
      {
        source: "/OCR-Encoded-PDFs",
        destination: "/Web_Site_Archives"
      },
      {
        source: "/OCR-Encoded-PDFs/Russell-County-Web-Site_2024-02-13_19_50_Modified-With-OCR-Encoding.zip",
        destination: "/Web_Site_Archives/Russell_County_Web_Site-2024-02-13_19_50_Modified_With_OCR_Encoding.zip"
      },
      {
        source: "/OCR-Encoded-PDFs/Russell-County-Web-Site_2024-02-13_19_50_Modified-With-OCR-Encoding/:u(.*)",
        destination: "/Web_Site_Archives/Russell_County_Web_Site-2024-02-13_19_50_Modified_With_OCR_Encoding:u"
      },
      { source: '/YouTube Channel', destination: '/Russell_County_BOS/YouTube_Channel' },
      { source: '/YouTube Channel.zip', destination: '/Russell_County_BOS/YouTube_Channel.zip' },
      { source: '/YouTube Channel/:u?', destination: '/Russell_County_BOS/YouTube_Channel/:u' },
      { source: '/Project Reclaim [WI19KR9Ogwg].mkv', destination: '/YouTube_Archives/@VADMME/Project Reclaim [WI19KR9Ogwg].mkv' },
    ]
  });
});

// Start server
app.listen(port, () => {
  console.log(`no-moss-3-carbo-landfill-library.online app listening on port ${port}`);
});