<?php
/**
 * Main Plugin class
 *
 * @package Jeremias\WcLicensedProduct
 */

declare(strict_types=1);

namespace Jeremias\WcLicensedProduct;

use Jeremias\WcLicensedProduct\Admin\AdminController;
use Jeremias\WcLicensedProduct\Admin\DashboardWidgetController;
use Jeremias\WcLicensedProduct\Admin\DownloadWidgetController;
use Jeremias\WcLicensedProduct\Admin\OrderLicenseController;
use Jeremias\WcLicensedProduct\Admin\SettingsController;
use Jeremias\WcLicensedProduct\Admin\VersionAdminController;
use Jeremias\WcLicensedProduct\Api\ResponseSigner;
use Jeremias\WcLicensedProduct\Api\RestApiController;
use Jeremias\WcLicensedProduct\Checkout\CheckoutBlocksIntegration;
use Jeremias\WcLicensedProduct\Checkout\CheckoutController;
use Jeremias\WcLicensedProduct\Checkout\StoreApiExtension;
use Jeremias\WcLicensedProduct\Email\LicenseEmailController;
use Jeremias\WcLicensedProduct\Frontend\AccountController;
use Jeremias\WcLicensedProduct\Frontend\DownloadController;
use Jeremias\WcLicensedProduct\License\LicenseManager;
use Jeremias\WcLicensedProduct\License\PluginLicenseChecker;
use Jeremias\WcLicensedProduct\Product\LicensedProductType;
use Jeremias\WcLicensedProduct\Product\VersionManager;
use Twig\Environment;
use Twig\Loader\FilesystemLoader;

/**
 * Main plugin controller
 */
final class Plugin
{
    /**
     * Singleton instance
     */
    private static ?Plugin $instance = null;

    /**
     * Twig environment
     */
    private Environment $twig;

    /**
     * License manager
     */
    private LicenseManager $licenseManager;

    /**
     * Version manager
     */
    private VersionManager $versionManager;

    /**
     * Download controller
     */
    private DownloadController $downloadController;

    /**
     * Get singleton instance
     */
    public static function instance(): Plugin
    {
        if (self::$instance === null) {
            self::$instance = new self();
        }

        return self::$instance;
    }

    /**
     * Get singleton instance (alias for instance())
     */
    public static function getInstance(): Plugin
    {
        return self::instance();
    }

    /**
     * Private constructor for singleton
     */
    private function __construct()
    {
        $this->initTwig();
        $this->initComponents();
        $this->registerHooks();
    }

    /**
     * Initialize Twig environment
     */
    private function initTwig(): void
    {
        $loader = new FilesystemLoader(WC_LICENSED_PRODUCT_PLUGIN_DIR . 'templates');
        $this->twig = new Environment($loader, [
            'cache' => WP_CONTENT_DIR . '/cache/wc-licensed-product/twig',
            'auto_reload' => true, // Always check for template changes
            'autoescape' => 'html', // Explicitly enable HTML autoescape for XSS protection
        ]);

        // Add WordPress functions as Twig functions
        $this->twig->addFunction(new \Twig\TwigFunction('__', function (string $text, string $domain = 'wc-licensed-product'): string {
            return __($text, $domain);
        }));

        $this->twig->addFunction(new \Twig\TwigFunction('esc_html', 'esc_html'));
        $this->twig->addFunction(new \Twig\TwigFunction('esc_attr', 'esc_attr'));
        $this->twig->addFunction(new \Twig\TwigFunction('esc_url', 'esc_url'));
        $this->twig->addFunction(new \Twig\TwigFunction('wp_nonce_field', 'wp_nonce_field', ['is_safe' => ['html']]));
        $this->twig->addFunction(new \Twig\TwigFunction('admin_url', 'admin_url'));
        $this->twig->addFunction(new \Twig\TwigFunction('wc_get_endpoint_url', 'wc_get_endpoint_url'));
    }

    /**
     * Initialize plugin components
     */
    private function initComponents(): void
    {
        $this->licenseManager = new LicenseManager();
        $this->versionManager = new VersionManager();

        // Check plugin license
        $licenseChecker = PluginLicenseChecker::getInstance();
        $isLicensed = $licenseChecker->isLicenseValid();

        // Always initialize product type (needed for existing orders)
        new LicensedProductType();

        // Only initialize frontend components if licensed or on localhost
        if ($isLicensed) {
            new CheckoutController($this->licenseManager);
            new StoreApiExtension($this->licenseManager);
            $this->registerCheckoutBlocksIntegration();
            $this->downloadController = new DownloadController($this->licenseManager, $this->versionManager);
            new AccountController($this->twig, $this->licenseManager, $this->versionManager, $this->downloadController);
        }

        // Always initialize REST API and email controller
        new RestApiController($this->licenseManager);
        new LicenseEmailController($this->licenseManager);

        // Initialize response signing if server secret is configured
        if (defined('WC_LICENSE_SERVER_SECRET') && WC_LICENSE_SERVER_SECRET !== '') {
            (new ResponseSigner())->register();
        }

        // Admin always available
        if (is_admin()) {
            new AdminController($this->twig, $this->licenseManager);
            new VersionAdminController($this->versionManager);
            new OrderLicenseController($this->licenseManager);
            new SettingsController();
            new DashboardWidgetController($this->licenseManager);
            new DownloadWidgetController($this->versionManager);

            // Show admin notice if unlicensed and not on localhost
            if (!$isLicensed && !$licenseChecker->isLocalhost()) {
                add_action('admin_notices', [$this, 'showUnlicensedNotice']);
            }
        }
    }

    /**
     * Register WooCommerce Checkout Blocks integration
     */
    private function registerCheckoutBlocksIntegration(): void
    {
        add_action('woocommerce_blocks_loaded', function (): void {
            if (class_exists('Automattic\WooCommerce\Blocks\Integrations\IntegrationRegistry')) {
                add_action(
                    'woocommerce_blocks_checkout_block_registration',
                    function ($integration_registry): void {
                        $integration_registry->register(new CheckoutBlocksIntegration());
                    }
                );
            }
        });
    }

    /**
     * Register plugin hooks
     */
    private function registerHooks(): void
    {
        // Only register order hooks if licensed (license generation requires valid license)
        $licenseChecker = PluginLicenseChecker::getInstance();
        if ($licenseChecker->isLicenseValid()) {
            // Generate license on order completion (multiple hooks for compatibility)
            add_action('woocommerce_order_status_completed', [$this, 'onOrderCompleted']);
            add_action('woocommerce_order_status_processing', [$this, 'onOrderCompleted']);

            // Also hook into payment complete for immediate license generation
            add_action('woocommerce_payment_complete', [$this, 'onOrderCompleted']);
        }
    }

    /**
     * Handle order completion - generate licenses
     */
    public function onOrderCompleted(int $orderId): void
    {
        $order = wc_get_order($orderId);
        if (!$order) {
            return;
        }

        foreach ($order->get_items() as $item) {
            $product = $item->get_product();
            if ($product && $product->is_type('licensed')) {
                $domain = $order->get_meta('_licensed_product_domain');
                if ($domain) {
                    $this->licenseManager->generateLicense(
                        $orderId,
                        $product->get_id(),
                        $order->get_customer_id(),
                        $domain
                    );
                }
            }
        }
    }

    /**
     * Get Twig environment
     */
    public function getTwig(): Environment
    {
        return $this->twig;
    }

    /**
     * Get license manager
     */
    public function getLicenseManager(): LicenseManager
    {
        return $this->licenseManager;
    }

    /**
     * Render a Twig template
     */
    public function render(string $template, array $context = []): string
    {
        return $this->twig->render($template, $context);
    }

    /**
     * Show admin notice when plugin is unlicensed
     */
    public function showUnlicensedNotice(): void
    {
        $settingsUrl = admin_url('admin.php?page=wc-settings&tab=licensed_product');
        ?>
        <div class="notice notice-warning is-dismissible">
            <p>
                <strong><?php esc_html_e('WC Licensed Product', 'wc-licensed-product'); ?>:</strong>
                <?php esc_html_e('Plugin license is not configured or invalid. Frontend features are disabled.', 'wc-licensed-product'); ?>
                <a href="<?php echo esc_url($settingsUrl); ?>"><?php esc_html_e('Configure License', 'wc-licensed-product'); ?></a>
            </p>
        </div>
        <?php
    }

    /**
     * Get the plugin license checker instance
     */
    public function getLicenseChecker(): PluginLicenseChecker
    {
        return PluginLicenseChecker::getInstance();
    }
}