<?php
session_start();

require_once __DIR__ . '/../Models/Product.php';

class CartController {
    public function __construct() {
        if (!isset($_SESSION['cart'])) {
            $_SESSION['cart'] = [];
        }
    }

    public function add() {
        if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['product_id'])) {
            $productId = (int)$_POST['product_id'];
            $quantity = isset($_POST['quantity']) ? (int)$_POST['quantity'] : 1;

            if ($quantity <= 0) {
                header('Location: /product.php?slug=' . $_POST['product_slug'] . '&error=Invalid quantity');
                exit();
            }

            $product = Product::findById($productId);

            if ($product) {
                if (isset($_SESSION['cart'][$productId])) {
                    $_SESSION['cart'][$productId]['quantity'] += $quantity;
                } else {
                    $_SESSION['cart'][$productId] = [
                        'product_id' => $productId,
                        'name' => $product['name'],
                        'price' => $product['price'],
                        'image' => $product['image'],
                        'slug' => $product['slug'],
                        'quantity' => $quantity,
                    ];
                }
            }
            header('Location: /cart.php');
            exit();
        }
    }

    public function update() {
        if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['product_id'])) {
            $productId = (int)$_POST['product_id'];
            $quantity = isset($_POST['quantity']) ? (int)$_POST['quantity'] : 0;

            if ($quantity > 0 && isset($_SESSION['cart'][$productId])) {
                $_SESSION['cart'][$productId]['quantity'] = $quantity;
            } else {
                unset($_SESSION['cart'][$productId]);
            }
        }
        header('Location: /cart.php');
        exit();
    }

    public function remove() {
        if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['product_id'])) {
            $productId = (int)$_POST['product_id'];
            unset($_SESSION['cart'][$productId]);
        }
        header('Location: /cart.php');
        exit();
    }

    public static function getCartContents() {
        return $_SESSION['cart'] ?? [];
    }

    public static function getCartItemCount() {
        $count = 0;
        if (isset($_SESSION['cart'])) {
            foreach ($_SESSION['cart'] as $item) {
                $count += $item['quantity'];
            }
        }
        return $count;
    }

    public static function getCartTotal() {
        $total = 0;
        if (isset($_SESSION['cart'])) {
            foreach ($_SESSION['cart'] as $item) {
                $total += $item['price'] * $item['quantity'];
            }
        }
        return $total;
    }
}

// Handle cart actions
if (isset($_POST['action'])) {
    $cartController = new CartController();
    switch ($_POST['action']) {
        case 'add':
            $cartController->add();
            break;
        case 'update':
            $cartController->update();
            break;
        case 'remove':
            $cartController->remove();
            break;
    }
}
?>