const express = require('express');
const { authenticateAPIKey, verifyToken } = require('../auth');
const { listGraphsBalanceHistory, listStock, removeGraphsBalance, saveGraphsBalance, upsertStockItems } = require('../services/stockService');

const router = express.Router();

router.get('/stock', verifyToken, async (req, res) => {
    try {
        res.json(await listStock());
    } catch (error) {
        console.error('Error fetching stock:', error);
        res.status(500).json({ error: 'Internal Server Error' });
    }
});

router.get('/stock/:productId/graphs-balance-history', verifyToken, async (req, res) => {
    try {
        res.json(await listGraphsBalanceHistory(req.params.productId));
    } catch (error) {
        console.error('Error fetching Graphs stock balance history:', error);
        res.status(500).json({ error: 'Internal Server Error' });
    }
});

router.put('/stock/:productId/graphs-balance', verifyToken, async (req, res) => {
    try {
        const balance = await saveGraphsBalance(req.params.productId, req.body, req.user?.email);
        res.json(balance);
    } catch (error) {
        console.error('Error saving Graphs stock balance:', error);
        res.status(error.statusCode || 500).json({ error: error.message || 'Internal Server Error' });
    }
});

router.delete('/stock/:productId/graphs-balance', verifyToken, async (req, res) => {
    try {
        const balance = await removeGraphsBalance(req.params.productId, req.user?.email);
        res.json(balance);
    } catch (error) {
        console.error('Error removing Graphs stock balance:', error);
        res.status(error.statusCode || 500).json({ error: error.message || 'Internal Server Error' });
    }
});

router.post('/stock', authenticateAPIKey, async (req, res) => {
    res.status(201).json({ message: 'Stock data received, processing in background' });

    const payload = Array.isArray(req.body) ? req.body : [req.body];

    upsertStockItems(payload).catch((error) => {
        console.error('Database stock insert error:', error);
    });
});

module.exports = router;