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

router.get('/summary', async (req, res) => {
  try {
    const data = await analytics.getSummary(req.db, req.query);
    res.json(data);
  } catch (err) {
    console.error('Summary error:', err);
    res.status(500).json({ error: err.message });
  }
});

router.get('/top-users', async (req, res) => {
  try {
    const limit = parseInt(req.query.limit) || 10;
    const data = await analytics.getTopUsers(req.db, req.query, limit);
    res.json(data);
  } catch (err) {
    console.error('Top users error:', err);
    res.status(500).json({ error: err.message });
  }
});

router.get('/top-models', async (req, res) => {
  try {
    const limit = parseInt(req.query.limit) || 10;
    const data = await analytics.getTopModels(req.db, req.query, limit);
    res.json(data);
  } catch (err) {
    console.error('Top models error:', err);
    res.status(500).json({ error: err.message });
  }
});

router.get('/top-agents', async (req, res) => {
  try {
    const limit = parseInt(req.query.limit) || 10;
    const data = await analytics.getTopAgents(req.db, req.query, limit);
    res.json(data);
  } catch (err) {
    console.error('Top agents error:', err);
    res.status(500).json({ error: err.message });
  }
});

router.get('/cost-breakdown', async (req, res) => {
  try {
    const data = await analytics.getCostBreakdown(req.db, req.query);
    res.json(data);
  } catch (err) {
    console.error('Cost breakdown error:', err);
    res.status(500).json({ error: err.message });
  }
});

router.get('/usage-over-time', async (req, res) => {
  try {
    const data = await analytics.getUsageOverTime(req.db, req.query);
    res.json(data);
  } catch (err) {
    console.error('Usage over time error:', err);
    res.status(500).json({ error: err.message });
  }
});

router.get('/top-conversations', async (req, res) => {
  try {
    const limit = parseInt(req.query.limit) || 20;
    const userId = req.query.userId || null;
    const data = await analytics.getTopConversations(req.db, req.query, limit, userId);
    res.json(data);
  } catch (err) {
    console.error('Top conversations error:', err);
    res.status(500).json({ error: err.message });
  }
});

router.get('/search-users', async (req, res) => {
  try {
    const q = req.query.q || '';
    if (q.length < 2) return res.json([]);
    const data = await analytics.searchUsers(req.db, q, 10);
    res.json(data);
  } catch (err) {
    console.error('Search users error:', err);
    res.status(500).json({ error: err.message });
  }
});

router.get('/user-detail', async (req, res) => {
  try {
    const userId = req.query.userId;
    if (!userId) return res.status(400).json({ error: 'userId required' });
    const data = await analytics.getUserDetail(req.db, req.query, userId);
    res.json(data);
  } catch (err) {
    console.error('User detail error:', err);
    res.status(500).json({ error: err.message });
  }
});

module.exports = router;