const express = require('express');
const { verifyToken } = require('../auth');
const {
    getClientAnalytics,
    getClientDetailsAnalytics,
    getDashboardAnalytics,
    getProductAnalytics,
    getProductDetailsAnalytics,
    getRfmAnalytics
} = require('../services/analyticsService');

const router = express.Router();

const getRange = (query) => ({
    start: query.start,
    end: query.end
});

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

router.get('/analytics/products', verifyToken, async (req, res) => {
    try {
        res.json(await getProductAnalytics(getRange(req.query)));
    } catch (error) {
        console.error('Error fetching product analytics:', error);
        res.status(500).json({ error: 'Internal Server Error' });
    }
});

router.get('/analytics/products/:productId/details', verifyToken, async (req, res) => {
    try {
        const details = await getProductDetailsAnalytics(req.params.productId, getRange(req.query));
        if (!details) {
            res.status(404).json({ error: 'Product not found' });
            return;
        }

        res.json(details);
    } catch (error) {
        console.error('Error fetching product details analytics:', error);
        res.status(500).json({ error: 'Internal Server Error' });
    }
});

router.get('/analytics/clients', verifyToken, async (req, res) => {
    try {
        res.json(await getClientAnalytics(getRange(req.query)));
    } catch (error) {
        console.error('Error fetching client analytics:', error);
        res.status(500).json({ error: 'Internal Server Error' });
    }
});

router.get('/analytics/clients/:clientToken/details', verifyToken, async (req, res) => {
    try {
        const details = await getClientDetailsAnalytics(req.params.clientToken, getRange(req.query));
        if (!details) {
            res.status(404).json({ error: 'Client not found' });
            return;
        }

        res.json(details);
    } catch (error) {
        console.error('Error fetching client details analytics:', error);
        res.status(500).json({ error: 'Internal Server Error' });
    }
});

router.get('/analytics/rfm', verifyToken, async (req, res) => {
    try {
        res.json(await getRfmAnalytics(getRange(req.query)));
    } catch (error) {
        console.error('Error fetching RFM analytics:', error);
        res.status(500).json({ error: 'Internal Server Error' });
    }
});

module.exports = router;