const express = require('express');
const { body, validationResult } = require('express-validator');
const paypalService = require('../services/paypal');
const woocommerceService = require('../services/woocommerce');
const { generateToken, verifyToken } = require('../utils/helpers');

const router = express.Router();

// Validation middleware
const validateCreateOrder = [
    body('wc_order_id').isNumeric().withMessage('WooCommerce order ID must be numeric'),
    body('total').isDecimal({ decimal_digits: '0,2' }).withMessage('Total must be a valid amount'),
    body('currency').optional().isAlpha().isLength({ min: 3, max: 3 }).withMessage('Currency must be 3 letter code'),
];

const validateCaptureOrder = [
    body('paypal_order_id').notEmpty().withMessage('PayPal order ID is required'),
    body('wc_order_id').isNumeric().withMessage('WooCommerce order ID must be numeric'),
];

// Create PayPal order
router.post('/create-order', validateCreateOrder, async (req, res) => {
    try {
        // Check validation errors
        const errors = validationResult(req);
        if (!errors.isEmpty()) {
            return res.status(400).json({
                success: false,
                error: 'Validation failed',
                details: errors.array()
            });
        }

        const { wc_order_id, total, currency, description, items } = req.body;

        // In development, allow bypassing WooCommerce validation
        let wcOrder = null;
        const skipWooCommerce = process.env.SKIP_WOOCOMMERCE === 'true';

        console.log('Skip WooCommerce:', skipWooCommerce, '| Env value:', process.env.SKIP_WOOCOMMERCE);

        if (!skipWooCommerce) {
            // Get WooCommerce order details for verification
            wcOrder = await woocommerceService.getOrder(wc_order_id);
            if (!wcOrder.success) {
                return res.status(400).json({
                    success: false,
                    error: 'Invalid WooCommerce order',
                    details: wcOrder.error,
                    suggestion: 'For testing without WooCommerce, add SKIP_WOOCOMMERCE=true to your backend/.env file'
                });
            }

            // Verify order total matches (security check)
            if (parseFloat(wcOrder.order.total) !== parseFloat(total)) {
                console.warn('Order total mismatch:', {
                    wc_total: wcOrder.order.total,
                    requested_total: total,
                    order_id: wc_order_id
                });

                return res.status(400).json({
                    success: false,
                    error: 'Order total mismatch'
                });
            }
        } else {
            console.log('Skipping WooCommerce validation - TEST MODE');
        }

        // Prepare order data for PayPal
        const orderData = {
            wc_order_id,
            reference_id: `WC-${wc_order_id}-${Date.now()}`,
            total: total,
            currency: currency || 'USD',
            description: description || `Order #${wc_order_id} from ${wcOrder?.order?.billing?.first_name || 'Test Customer'}`,
            items: items || [],
            brand_name: 'Fashion Store', // Customize this

            // ADD CUSTOMER DETAILS FROM WOOCOMMERCE:
            payer: wcOrder ? {
                email: wcOrder.order.billing.email,
                first_name: wcOrder.order.billing.first_name,
                last_name: wcOrder.order.billing.last_name,
                phone: wcOrder.order.billing.phone
            } : null,

            shipping: wcOrder ? {
                first_name: wcOrder.order.shipping.first_name,
                last_name: wcOrder.order.shipping.last_name,
                address_1: wcOrder.order.shipping.address_1,
                address_2: wcOrder.order.shipping.address_2,
                city: wcOrder.order.shipping.city,
                state: wcOrder.order.shipping.state,
                postcode: wcOrder.order.shipping.postcode,
                country: wcOrder.order.shipping.country
            } : null,

            // Optional: Add breakdown
            items_total: wcOrder ? wcOrder.order.total : total,
            shipping_total: wcOrder ? wcOrder.order.shipping_total : '0.00',
            tax_total: wcOrder ? wcOrder.order.total_tax : '0.00'
        };

        // Create PayPal order
        const paypalResult = await paypalService.createOrder(orderData);

        if (!paypalResult.success) {
            return res.status(500).json({
                success: false,
                error: 'Failed to create PayPal order',
                details: paypalResult.error
            });
        }

        // Generate secure token for this transaction
        const token = generateToken({
            wc_order_id,
            paypal_order_id: paypalResult.order_id,
            total,
            created_at: Date.now()
        });

        res.json({
            success: true,
            paypal_order_id: paypalResult.order_id,
            token: token,
            approval_url: paypalResult.links?.find(link => link.rel === 'approve')?.href
        });

    } catch (error) {
        console.error('Create Order Error:', error);
        res.status(500).json({
            success: false,
            error: 'Internal server error'
        });
    }
});

// Capture PayPal payment
router.post('/capture-order', validateCaptureOrder, async (req, res) => {
    try {
        // Check validation errors
        const errors = validationResult(req);
        if (!errors.isEmpty()) {
            return res.status(400).json({
                success: false,
                error: 'Validation failed',
                details: errors.array()
            });
        }

        const { paypal_order_id, wc_order_id, token } = req.body;

        console.log('Capture request received:', {
            paypal_order_id,
            wc_order_id,
            hasToken: !!token,
            tokenLength: token?.length
        });

        // Verify token (optional in development)
        const skipTokenValidation = process.env.NODE_ENV === 'development' && process.env.SKIP_TOKEN_VALIDATION === 'true';

        if (token && !skipTokenValidation) {
            const tokenData = verifyToken(token);
            console.log('Token verification result:', {
                isValid: !!tokenData,
                tokenData: tokenData
            });

            if (!tokenData || tokenData.wc_order_id !== parseInt(wc_order_id)) {
                console.error('Token validation failed:', {
                    tokenData,
                    expectedOrderId: wc_order_id,
                    tokenOrderId: tokenData?.wc_order_id
                });

                return res.status(401).json({
                    success: false,
                    error: 'Invalid or expired token'
                });
            }
        } else if (skipTokenValidation) {
            console.warn('Skipping token validation - DEVELOPMENT MODE');
        } else {
            console.warn('No token provided in capture request');
        }

        // Capture the PayPal payment
        const captureResult = await paypalService.captureOrder(paypal_order_id);

        if (!captureResult.success) {
            // Mark WooCommerce order as failed only if not skipping WooCommerce
            if (process.env.SKIP_WOOCOMMERCE !== 'true') {
                await woocommerceService.failPayment(wc_order_id, captureResult.error);
            }

            return res.status(400).json({
                success: false,
                error: 'Payment capture failed',
                details: captureResult.error
            });
        }

        // Update WooCommerce order (skip if in test mode)
        let wcResult = { success: true, message: 'WooCommerce update skipped (test mode)' };

        if (process.env.SKIP_WOOCOMMERCE !== 'true') {
            wcResult = await woocommerceService.completePayment(wc_order_id, captureResult);

            if (!wcResult.success) {
                console.error('WooCommerce update failed after successful payment:', wcResult.error);
                // Payment succeeded but WC update failed - this needs manual review
            }
        } else {
            console.log('Skipping WooCommerce update - TEST MODE');
        }

        res.json({
            success: true,
            transaction_id: captureResult.transaction_id,
            status: captureResult.status,
            payer_email: captureResult.payer?.email_address,
            woocommerce_updated: wcResult.success,
            test_mode: process.env.SKIP_WOOCOMMERCE === 'true'
        });

    } catch (error) {
        console.error('Capture Order Error:', error);
        res.status(500).json({
            success: false,
            error: 'Internal server error'
        });
    }
});

// Get order status
router.get('/order-status/:wc_order_id', async (req, res) => {
    try {
        const { wc_order_id } = req.params;

        if (!wc_order_id || isNaN(wc_order_id)) {
            return res.status(400).json({
                success: false,
                error: 'Invalid order ID'
            });
        }

        // Skip WooCommerce check if in test mode
        if (process.env.SKIP_WOOCOMMERCE === 'true') {
            return res.json({
                success: true,
                order_id: wc_order_id,
                status: 'completed',
                total: '0.00',
                currency: 'USD',
                payment_method: 'paypal',
                payment_method_title: 'PayPal (Test Mode)',
                test_mode: true
            });
        }

        const wcOrder = await woocommerceService.getOrder(wc_order_id);

        if (!wcOrder.success) {
            return res.status(404).json({
                success: false,
                error: 'Order not found'
            });
        }

        res.json({
            success: true,
            order_id: wcOrder.order.id,
            status: wcOrder.order.status,
            total: wcOrder.order.total,
            currency: wcOrder.order.currency,
            payment_method: wcOrder.order.payment_method,
            payment_method_title: wcOrder.order.payment_method_title,
            line_items: wcOrder.order.line_items.map(item => ({
                name: item.name,
                quantity: item.quantity,
                price: item.price,
                total: item.total,
                image: item.image?.src || null
            })),
            billing: {
                first_name: wcOrder.order.billing.first_name,
                last_name: wcOrder.order.billing.last_name,
                company: wcOrder.order.billing.company,
                address_1: wcOrder.order.billing.address_1,
                address_2: wcOrder.order.billing.address_2,
                city: wcOrder.order.billing.city,
                state: wcOrder.order.billing.state,
                postcode: wcOrder.order.billing.postcode,
                country: wcOrder.order.billing.country,
                email: wcOrder.order.billing.email,
                phone: wcOrder.order.billing.phone
            },
            shipping: {
                total: wcOrder.order.shipping_total,
                method: wcOrder.order.shipping_lines[0]?.method_title,
                first_name: wcOrder.order.shipping.first_name,
                last_name: wcOrder.order.shipping.last_name,
                company: wcOrder.order.shipping.company,
                address_1: wcOrder.order.shipping.address_1,
                address_2: wcOrder.order.shipping.address_2,
                city: wcOrder.order.shipping.city,
                state: wcOrder.order.shipping.state,
                postcode: wcOrder.order.shipping.postcode,
                country: wcOrder.order.shipping.country
            }
        });

    } catch (error) {
        console.error('Get Order Status Error:', error);
        res.status(500).json({
            success: false,
            error: 'Internal server error'
        });
    }
});

module.exports = router;