/**
 * /api/models routes
 *
 * Returns available model lists for each provider.
 * Claude models are fetched live from MODELS_API_BASE_URL/v1/models
 * (9router) and cached for 5 minutes; other providers use their
 * static constants.
 */

import express from 'express';
import { getAvailableClaudeModels, invalidateModelCache } from '../services/model-discovery.js';
import { CODEX_MODELS, CURSOR_MODELS, GEMINI_MODELS } from '../../shared/modelConstants.js';

const router = express.Router();

/**
 * GET /api/models
 * Returns all providers' model lists.
 * Claude list is dynamically fetched from 9router when configured.
 */
router.get('/', async (_req, res) => {
  try {
    const claudeModels = await getAvailableClaudeModels();

    res.json({
      claude:  claudeModels,
      codex:   CODEX_MODELS.OPTIONS,
      gemini:  GEMINI_MODELS.OPTIONS,
      cursor:  CURSOR_MODELS.OPTIONS,
    });
  } catch (err) {
    console.error('[/api/models] Error:', err?.message ?? err);
    res.status(500).json({ error: 'Failed to load model list' });
  }
});

/**
 * GET /api/models/claude
 * Returns only Claude model list (with 9router discovery).
 */
router.get('/claude', async (_req, res) => {
  try {
    const models = await getAvailableClaudeModels();
    res.json({ models });
  } catch (err) {
    console.error('[/api/models/claude] Error:', err?.message ?? err);
    res.status(500).json({ error: 'Failed to load Claude model list' });
  }
});

/**
 * POST /api/models/refresh
 * Force-invalidates the model cache (admin convenience endpoint).
 */
router.post('/refresh', (_req, res) => {
  invalidateModelCache();
  res.json({ success: true, message: 'Model cache invalidated' });
});

export default router;