const express = require('express');
const paypalService = require('../services/paypal');
const woocommerceService = require('../services/woocommerce');

const router = express.Router();

// PayPal webhook handler
router.post('/paypal', async (req, res) => {
    try {
        const webhookBody = req.body;
        const headers = req.headers;

        console.log('PayPal Webhook Received:', {
            event_type: webhookBody.event_type,
            resource_id: webhookBody.resource?.id,
            timestamp: new Date().toISOString()
        });

        // Verify webhook signature (simplified for development)
        const isValid = paypalService.verifyWebhookSignature(headers, webhookBody, process.env.PAYPAL_WEBHOOK_ID);

        if (!isValid) {
            console.warn('Invalid PayPal webhook signature');
            return res.status(401).json({ error: 'Invalid signature' });
        }

        // Handle different webhook events
        switch (webhookBody.event_type) {
            case 'PAYMENT.CAPTURE.COMPLETED':
                await handlePaymentCaptured(webhookBody.resource);
                break;

            case 'PAYMENT.CAPTURE.DENIED':
                await handlePaymentDenied(webhookBody.resource);
                break;

            case 'PAYMENT.CAPTURE.REFUNDED':
                await handlePaymentRefunded(webhookBody.resource);
                break;

            default:
                console.log('Unhandled PayPal webhook event:', webhookBody.event_type);
        }

        res.status(200).json({ status: 'success' });

    } catch (error) {
        console.error('PayPal Webhook Error:', error);
        res.status(500).json({ error: 'Webhook processing failed' });
    }
});

// Handle payment captured
async function handlePaymentCaptured(resource) {
    try {
        console.log('Processing payment capture webhook:', {
            capture_id: resource.id,
            amount: resource.amount?.value,
            custom_id: resource.custom_id
        });

        const customId = resource.custom_id;
        if (!customId) {
            console.warn('No custom_id found in payment capture');
            return;
        }

        // Extract WooCommerce order ID from custom_id
        const wcOrderId = parseInt(customId);
        if (isNaN(wcOrderId)) {
            console.warn('Invalid WooCommerce order ID in custom_id:', customId);
            return;
        }

        // Prepare payment data
        const paymentData = {
            transaction_id: resource.id,
            payer: {
                email_address: resource.payer?.email_address || 'N/A'
            }
        };

        // Update WooCommerce order
        const result = await woocommerceService.completePayment(wcOrderId, paymentData);

        if (result.success) {
            console.log('Payment capture webhook processed successfully');
        } else {
            console.error('Failed to update WooCommerce order from webhook:', result.error);
        }

    } catch (error) {
        console.error('Handle Payment Captured Error:', error);
    }
}

// Handle payment denied
async function handlePaymentDenied(resource) {
    try {
        console.log('Processing payment denied webhook:', {
            capture_id: resource.id,
            custom_id: resource.custom_id
        });

        const customId = resource.custom_id;
        if (!customId) {
            console.warn('No custom_id found in payment denial');
            return;
        }

        const wcOrderId = parseInt(customId);
        if (isNaN(wcOrderId)) {
            console.warn('Invalid WooCommerce order ID in custom_id:', customId);
            return;
        }

        // Mark order as failed
        const result = await woocommerceService.failPayment(wcOrderId, 'Payment was denied by PayPal');

        if (result.success) {
            console.log('Payment denial webhook processed successfully');
        } else {
            console.error('Failed to update WooCommerce order from denial webhook:', result.error);
        }

    } catch (error) {
        console.error('Handle Payment Denied Error:', error);
    }
}

// Handle payment refunded
async function handlePaymentRefunded(resource) {
    try {
        console.log('Processing payment refund webhook:', {
            refund_id: resource.id,
            amount: resource.amount?.value,
            custom_id: resource.custom_id
        });

        const customId = resource.custom_id;
        if (!customId) {
            console.warn('No custom_id found in payment refund');
            return;
        }

        const wcOrderId = parseInt(customId);
        if (isNaN(wcOrderId)) {
            console.warn('Invalid WooCommerce order ID in custom_id:', customId);
            return;
        }

        // Add refund note to WooCommerce order
        const noteText = `Payment refunded via PayPal. Refund ID: ${resource.id}. Amount: ${resource.amount?.value} ${resource.amount?.currency_code}`;

        await woocommerceService.addOrderNote(wcOrderId, noteText, true);

        console.log('Payment refund webhook processed successfully');

    } catch (error) {
        console.error('Handle Payment Refunded Error:', error);
    }
}

// Health check for webhooks
router.get('/health', (req, res) => {
    res.json({
        status: 'OK',
        service: 'webhooks',
        timestamp: new Date().toISOString()
    });
});

module.exports = router;