const express = require('express');
const fs = require('fs');
const path = require('path');
const router = express.Router();

const ALGORITHMS_PATH = path.join(__dirname, '../../data/algorithms.json');

router.get('/', (req, res) => {
  try {
    const data = fs.readFileSync(ALGORITHMS_PATH, 'utf8');
    const algorithms = JSON.parse(data);
    res.json(algorithms);
  } catch (error) {
    res.status(500).json({ error: 'Failed to load algorithms' });
  }
});

router.put('/', (req, res) => {
  try {
    const updatedAlgorithms = req.body;
    fs.writeFileSync(ALGORITHMS_PATH, JSON.stringify(updatedAlgorithms, null, 2));
    res.json({ message: 'Algorithms updated successfully' });
  } catch (error) {
    res.status(500).json({ error: 'Failed to update algorithms' });
  }
});

router.get('/categories', (req, res) => {
  try {
    const data = fs.readFileSync(ALGORITHMS_PATH, 'utf8');
    const algorithms = JSON.parse(data);
    
    const categories = {};
    Object.values(algorithms.algorithms).forEach(algo => {
      if (!categories[algo.category]) {
        categories[algo.category] = [];
      }
      categories[algo.category].push(algo.name);
    });
    
    res.json(categories);
  } catch (error) {
    res.status(500).json({ error: 'Failed to get categories' });
  }
});

module.exports = router;