app.js

import config from 'config';
import fs from 'fs';
import path from 'path';
import express from 'express';
import { fileURLToPath } from 'url';
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
import ReportController from './controllers/ReportController.js';
import InspectController from './controllers/InspectController.js';
import json2obj from './helpers/json2obj.js';
import { parse as json2csv } from 'json2csv';

const app = express();

// basic express server setup
app.set('views', path.resolve(__dirname, 'views'));
app.set('view engine', 'ejs');

// Middleware to serve static files from the 'public' directory
app.use(express.static(path.join(__dirname, 'public')));

app.get('/', async (req, res) => {
  const filePath = new URL('./output/summary.json', import.meta.url);
  const summary = await json2obj(filePath);
  res.render('index', {
    title: 'LibGuides Search Results',
    summary: summary,
    message: 'Check the console for detailed output.',
  });
});

app.get('/inspect', (req, res) => {
  res.redirect('/'); // Redirect to the main page if no ID is provided
});

app.get('/inspect/:id', async (req, res) => {
  const id = req.params.id;
  let kwicChars = req.query.kwicChars || undefined;
  try {
    const results = InspectController(id, kwicChars);
    // create url query string for the view

    const queryString = new URLSearchParams(req.query).toString();
    const types = new URLSearchParams(req.query).get('types');
    // console.log(`Query String: ${queryString}`);
    if (JSON.stringify(req.query).includes('json')) {
      return res.send(results); // JSON response for API requests
    }
    results.queryString = queryString;
    results.types = types; // Add query string to results for the view
    res.render('inspect', results); // HTML display
  } catch (error) {
    console.error(`Error inspecting ID ${id}:`, error);
    return res
      .status(400)
      .send(`Entry not found or invalid ID: ${id}; ${error}`);
  }
});

app.get('/report', (req, res) => {
  // if file exists in public/docs, deliver it
  const filePath = path.join(
    __dirname,
    'public',
    'docs',
    'libGuidesSearchReport.csv'
  );
  if (fs.existsSync(filePath)) {
    return res.download(filePath); // Download the report file
  }
  // If the file does not exist, generate the report
  else {
    let report = ReportController();
    if (JSON.stringify(req.query).includes('json')) {
      return res.send(report); // JSON response for API requests
    }
    // default to CSV output
    const csv = json2csv(report.items);
    res.header('Content-Type', 'text/csv');
    res.setHeader(
      'Content-Disposition',
      'attachment; filename=libGuidesSearchReport.csv'
    );
    res.send(csv); // Send CSV file as response
  }
});

const PORT = config.get('app.port') || 3000; // Use environment variable or default to 3000
app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
  console.log(`Go to http://localhost:${PORT}/`);
});