const express = require('express');
const router = express.Router();
const {
  PROVIDER_PRESETS, getProviders, getProvider, saveProvider, deleteProvider,
  maskKey, chatCompletion, syncAiConfigFile
} = require('../lib/ai');
const { logAudit } = require('../db');

router.get('/', (req, res) => {
  const providers = getProviders().map(p => ({
    ...p,
    api_key_masked: maskKey(getProvider(p.id)?.api_key)
  }));
  res.render('ai-providers', {
    providers,
    presets: PROVIDER_PRESETS,
    saved: req.query.saved === '1',
    tested: req.query.tested,
    error: req.query.error || null
  });
});

router.post('/save', (req, res) => {
  const { id, name, provider_type, api_key, base_url, default_model, is_active, is_default } = req.body;
  const preset = PROVIDER_PRESETS[provider_type] || PROVIDER_PRESETS.custom;
  let key = api_key;
  if (id && (!key || key.includes('••••'))) {
    const existing = getProvider(id);
    key = existing?.api_key || '';
  }
  saveProvider({
    id: id ? parseInt(id, 10) : null,
    name: name || preset.label,
    provider_type: provider_type || 'openrouter',
    api_key: key,
    base_url: base_url || preset.base_url,
    default_model: default_model || preset.models[0] || '',
    is_active: is_active === '1',
    is_default: is_default === '1'
  });
  logAudit(req.session.userId, req.session.username, 'ai_provider_saved', 'ai_provider', id || null, name);
  res.redirect('/ai?saved=1');
});

router.post('/delete/:id', (req, res) => {
  deleteProvider(req.params.id);
  logAudit(req.session.userId, req.session.username, 'ai_provider_deleted', 'ai_provider', req.params.id, '');
  res.redirect('/ai?saved=1');
});

router.post('/sync', (req, res) => {
  syncAiConfigFile();
  res.redirect('/ai?saved=1');
});

router.post('/test/:id', async (req, res) => {
  try {
    const result = await chatCompletion(
      [{ role: 'user', content: 'Antwoord met exact: Mek-Tech AI verbinding OK' }],
      { providerId: parseInt(req.params.id, 10), max_tokens: 50 }
    );
    const text = result.choices?.[0]?.message?.content || 'OK';
    res.redirect('/ai?tested=' + encodeURIComponent(text.slice(0, 80)));
  } catch (e) {
    res.redirect('/ai?error=' + encodeURIComponent(e.message));
  }
});

router.post('/chat', async (req, res) => {
  try {
    const { messages, provider_id, model, client_id } = req.body;
    const result = await chatCompletion(messages, {
      providerId: provider_id ? parseInt(provider_id, 10) : null,
      model
    });
    const content = result.choices?.[0]?.message?.content || '';
    if (client_id) {
      const { getDb } = require('../db');
      getDb().prepare('INSERT INTO client_notes (client_id, content, created_by) VALUES (?, ?, ?)')
        .run(client_id, `[AI] ${content.slice(0, 2000)}`, req.session.username || 'ai');
    }
    res.json({ success: true, content, model: result.model });
  } catch (e) {
    res.status(500).json({ success: false, error: e.message });
  }
});

module.exports = router;