File Contents: /home/u885320773/domains/sugatu.in/update_cart.php

<?php
session_start();

header('Content-Type: application/json');

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $data = json_decode(file_get_contents('php://input'), true);

if (!isset($data['productId'], $data['quantity'])) {
        echo json_encode(['success' => false, 'message' => 'Invalid request.']);
        exit;
    }

$productId = $data['productId'];
    $quantity = (int)$data['quantity'];

if ($quantity < 1) {
        echo json_encode(['success' => false, 'message' => 'Quantity must be at least 1.']);
        exit;
    }

if (isset($_SESSION['cart'][$productId])) {
        // Update the session cart quantity
        $_SESSION['cart'][$productId]['quantity'] = $quantity;

// Fetch product details from session cart
        $price = $_SESSION['cart'][$productId]['price'];
        $gstPercent = $_SESSION['cart'][$productId]['gstpercent'];
        $incGst = $price + ($price * $gstPercent / 100);
        $subtotal = $incGst * $quantity;

// Update total cart value
        $total = 0;
        foreach ($_SESSION['cart'] as $item) {
            $itemPrice = $item['price'];
            $itemGst = $itemPrice + ($itemPrice * $item['gstpercent'] / 100);
            $total += $itemGst * $item['quantity'];
        }

// Get discount from session or default to 0
        $discountPercent = isset($_SESSION['discount_percent']) ? $_SESSION['discount_percent'] : 0;

// Calculate discount amount
        $discountAmount = ($total * $discountPercent) / 100;

// Calculate grand total
        $grandTotal = $total - $discountAmount;

echo json_encode([
            'success' => true,
            'gstPercent' => $gstPercent,
            'incGst' => $incGst,
            'subtotal' => $subtotal,
            'total' => $total,
            'cart-total' => $total,
            'discount-amount' => $discountAmount,
            'grand-total' => $grandTotal
        ]);
    } else {
        echo json_encode(['success' => false, 'message' => 'Product not found in cart.']);
    }
} else {
    echo json_encode(['success' => false, 'message' => 'Invalid request method.']);
}

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