const express = require('express');

function createConfigRoutes(db) {
  const router = express.Router();

  // Get all configs (optionally by category)
  router.get('/', (req, res) => {
    const { category } = req.query;
    let configs;
    if (category) {
      configs = db.prepare('SELECT * FROM configs WHERE category = ? ORDER BY key').all(category);
    } else {
      configs = db.prepare('SELECT * FROM configs ORDER BY category, key').all();
    }
    // Group by category
    const grouped = {};
    for (const c of configs) {
      if (!grouped[c.category]) grouped[c.category] = {};
      grouped[c.category][c.key] = c.value;
    }
    res.json(grouped);
  });

  // Get single config
  router.get('/:key', (req, res) => {
    const config = db.prepare('SELECT * FROM configs WHERE key = ?').get(req.params.key);
    if (!config) return res.status(404).json({ error: 'Config not found' });
    res.json(config);
  });

  // Update config
  router.put('/:key', (req, res) => {
    const { value } = req.body;
    if (value === undefined) return res.status(400).json({ error: 'value is required' });
    const existing = db.prepare('SELECT * FROM configs WHERE key = ?').get(req.params.key);
    if (existing) {
      db.prepare('UPDATE configs SET value = ?, updated_at = CURRENT_TIMESTAMP WHERE key = ?').run(value, req.params.key);
    } else {
      const { category } = req.body;
      db.prepare('INSERT INTO configs (key, value, category) VALUES (?, ?, ?)').run(req.params.key, value, category || 'general');
    }
    res.json(db.prepare('SELECT * FROM configs WHERE key = ?').get(req.params.key));
  });

  // Batch update configs
  router.put('/', (req, res) => {
    const { configs } = req.body;
    if (!configs || typeof configs !== 'object') {
      return res.status(400).json({ error: 'configs object required' });
    }
    const upsert = db.prepare(
      'INSERT INTO configs (key, value, updated_at) VALUES (?, ?, CURRENT_TIMESTAMP) ON CONFLICT(key) DO UPDATE SET value=excluded.value, updated_at=CURRENT_TIMESTAMP'
    );
    const batch = db.transaction(() => {
      for (const [key, value] of Object.entries(configs)) {
        upsert.run(key, String(value));
      }
    });
    batch();
    res.json({ success: true });
  });

  return router;
}

module.exports = createConfigRoutes;