const { Router } = require('express');
const balanceService = require('../services/balance');

const router = Router();

router.get('/stats', async (req, res) => {
  try {
    const stats = await balanceService.getStats(req.db);
    res.json(stats);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.get('/balances', async (req, res) => {
  try {
    const { page = 1, limit = 50 } = req.query;
    const result = await balanceService.getAllBalances(req.db, parseInt(page), parseInt(limit));
    res.json(result);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.get('/balances/low', async (req, res) => {
  try {
    const { threshold = 1000000 } = req.query;
    const users = await balanceService.getLowBalances(req.db, parseInt(threshold));
    res.json({ users });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

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

router.get('/balances/:userId', async (req, res) => {
  try {
    const balance = await balanceService.getUserBalance(req.db, req.params.userId);
    if (!balance) {
      return res.status(404).json({ error: 'User not found' });
    }
    res.json(balance);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.post('/balances/:userId/set', async (req, res) => {
  try {
    const { amount } = req.body;
    if (typeof amount !== 'number' || amount < 0) {
      return res.status(400).json({ error: 'Invalid amount' });
    }
    const result = await balanceService.setBalance(req.db, req.params.userId, amount);
    res.json(result);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.post('/balances/:userId/add', async (req, res) => {
  try {
    const { amount } = req.body;
    if (typeof amount !== 'number' || amount === 0) {
      return res.status(400).json({ error: 'Invalid amount' });
    }
    const result = await balanceService.addBalance(req.db, req.params.userId, amount);
    res.json(result);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.post('/balances/bulk/add', async (req, res) => {
  try {
    const { amount } = req.body;
    if (typeof amount !== 'number' || amount === 0) {
      return res.status(400).json({ error: 'Invalid amount' });
    }
    const result = await balanceService.addToAll(req.db, amount);
    res.json(result);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.post('/balances/bulk/set', async (req, res) => {
  try {
    const { amount } = req.body;
    if (typeof amount !== 'number' || amount < 0) {
      return res.status(400).json({ error: 'Invalid amount' });
    }
    const result = await balanceService.setAll(req.db, amount);
    res.json(result);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

module.exports = router;