const express = require('express');
const db = require('../db');
const router = express.Router();

// GET /api/config — all key-value pairs
router.get('/', (req, res) => {
  try {
    const rows = db.prepare('SELECT key, value FROM config ORDER BY key').all();
    const result = {};
    for (const row of rows) {
      result[row.key] = row.value;
    }
    res.json(result);
  } catch (err) {
    console.error('[config] list error:', err.message);
    res.status(500).json({ error: err.message });
  }
});

// PUT /api/config — upsert by key
// Body: { key, value }
router.put('/', (req, res) => {
  const { key, value } = req.body;
  if (key === undefined || value === undefined) {
    return res.status(400).json({ error: 'key and value are required' });
  }

  try {
    const existing = db.prepare('SELECT key FROM config WHERE key = ?').get(key);
    if (existing) {
      db.prepare('UPDATE config SET value = ? WHERE key = ?').run(value, key);
    } else {
      db.prepare('INSERT INTO config (key, value) VALUES (?, ?)').run(key, value);
    }
    res.json({ key, value });
  } catch (err) {
    console.error('[config] upsert error:', err.message);
    res.status(500).json({ error: err.message });
  }
});

// POST /api/config/test-vlm — proxy VLM test through backend to avoid CORS
router.post('/test-vlm', async (req, res) => {
  const { url } = req.body;
  if (!url) {
    return res.status(400).json({ error: 'url is required' });
  }

  const start = Date.now();
  try {
    const resp = await fetch(url, { method: 'HEAD', signal: AbortSignal.timeout(5000) });
    res.json({
      success: resp.ok,
      latency_ms: Date.now() - start,
      message: resp.ok ? 'Endpoint responde' : `HTTP ${resp.status}`,
    });
  } catch (err) {
    res.json({
      success: false,
      latency_ms: Date.now() - start,
      message: err.message,
    });
  }
});

module.exports = router;