<?php
/**
 * Admin Controller
 *
 * @package Jeremias\WcLicensedProduct\Admin
 */

declare(strict_types=1);

namespace Jeremias\WcLicensedProduct\Admin;

use Jeremias\WcLicensedProduct\License\License;
use Jeremias\WcLicensedProduct\License\LicenseManager;
use Twig\Environment;

/**
 * Handles admin pages for license management
 */
final class AdminController
{
    private Environment $twig;
    private LicenseManager $licenseManager;

    public function __construct(Environment $twig, LicenseManager $licenseManager)
    {
        $this->twig = $twig;
        $this->licenseManager = $licenseManager;
        $this->registerHooks();
    }

    /**
     * Register WordPress hooks
     */
    private function registerHooks(): void
    {
        // Add admin menu
        add_action('admin_menu', [$this, 'addAdminMenu']);

        // Enqueue admin styles
        add_action('admin_enqueue_scripts', [$this, 'enqueueStyles']);

        // Handle admin actions
        add_action('admin_init', [$this, 'handleAdminActions']);

        // Add licenses column to orders list
        add_filter('manage_edit-shop_order_columns', [$this, 'addOrdersLicenseColumn']);
        add_action('manage_shop_order_posts_custom_column', [$this, 'displayOrdersLicenseColumn'], 10, 2);

        // HPOS compatibility
        add_filter('woocommerce_shop_order_list_table_columns', [$this, 'addOrdersLicenseColumn']);
        add_action('woocommerce_shop_order_list_table_custom_column', [$this, 'displayOrdersLicenseColumnHpos'], 10, 2);
    }

    /**
     * Add admin menu pages
     */
    public function addAdminMenu(): void
    {
        add_submenu_page(
            'woocommerce',
            __('Licenses', 'wc-licensed-product'),
            __('Licenses', 'wc-licensed-product'),
            'manage_woocommerce',
            'wc-licenses',
            [$this, 'renderLicensesPage']
        );
    }

    /**
     * Enqueue admin styles and scripts
     */
    public function enqueueStyles(string $hook): void
    {
        if ($hook !== 'woocommerce_page_wc-licenses') {
            return;
        }

        wp_enqueue_style(
            'wc-licensed-product-admin',
            WC_LICENSED_PRODUCT_PLUGIN_URL . 'assets/css/admin.css',
            [],
            WC_LICENSED_PRODUCT_VERSION
        );
    }

    /**
     * Handle admin actions (update, delete licenses)
     */
    public function handleAdminActions(): void
    {
        if (!isset($_GET['page']) || $_GET['page'] !== 'wc-licenses') {
            return;
        }

        if (!current_user_can('manage_woocommerce')) {
            return;
        }

        // Handle status update
        if (isset($_POST['action']) && $_POST['action'] === 'update_license_status') {
            $this->handleStatusUpdate();
        }

        // Handle delete
        if (isset($_GET['action']) && $_GET['action'] === 'delete' && isset($_GET['license_id'])) {
            $this->handleDelete();
        }

        // Handle revoke
        if (isset($_GET['action']) && $_GET['action'] === 'revoke' && isset($_GET['license_id'])) {
            $this->handleRevoke();
        }
    }

    /**
     * Handle license status update
     */
    private function handleStatusUpdate(): void
    {
        if (!wp_verify_nonce($_POST['_wpnonce'] ?? '', 'update_license_status')) {
            wp_die(__('Security check failed.', 'wc-licensed-product'));
        }

        $licenseId = absint($_POST['license_id'] ?? 0);
        $status = sanitize_text_field($_POST['status'] ?? '');

        if ($licenseId && in_array($status, [License::STATUS_ACTIVE, License::STATUS_INACTIVE, License::STATUS_REVOKED], true)) {
            $this->licenseManager->updateLicenseStatus($licenseId, $status);

            wp_redirect(admin_url('admin.php?page=wc-licenses&updated=1'));
            exit;
        }
    }

    /**
     * Handle license deletion
     */
    private function handleDelete(): void
    {
        if (!wp_verify_nonce($_GET['_wpnonce'] ?? '', 'delete_license')) {
            wp_die(__('Security check failed.', 'wc-licensed-product'));
        }

        $licenseId = absint($_GET['license_id'] ?? 0);
        if ($licenseId) {
            $this->licenseManager->deleteLicense($licenseId);

            wp_redirect(admin_url('admin.php?page=wc-licenses&deleted=1'));
            exit;
        }
    }

    /**
     * Handle license revocation
     */
    private function handleRevoke(): void
    {
        if (!wp_verify_nonce($_GET['_wpnonce'] ?? '', 'revoke_license')) {
            wp_die(__('Security check failed.', 'wc-licensed-product'));
        }

        $licenseId = absint($_GET['license_id'] ?? 0);
        if ($licenseId) {
            $this->licenseManager->updateLicenseStatus($licenseId, License::STATUS_REVOKED);

            wp_redirect(admin_url('admin.php?page=wc-licenses&revoked=1'));
            exit;
        }
    }

    /**
     * Render licenses admin page
     */
    public function renderLicensesPage(): void
    {
        $page = isset($_GET['paged']) ? absint($_GET['paged']) : 1;
        $perPage = 20;

        $licenses = $this->licenseManager->getAllLicenses($page, $perPage);
        $totalLicenses = $this->licenseManager->getLicenseCount();
        $totalPages = ceil($totalLicenses / $perPage);

        // Enrich licenses with related data
        $enrichedLicenses = [];
        foreach ($licenses as $license) {
            $product = wc_get_product($license->getProductId());
            $order = wc_get_order($license->getOrderId());
            $customer = get_userdata($license->getCustomerId());

            $enrichedLicenses[] = [
                'license' => $license,
                'product_name' => $product ? $product->get_name() : __('Unknown', 'wc-licensed-product'),
                'product_edit_url' => $product ? get_edit_post_link($product->get_id()) : '',
                'order_number' => $order ? $order->get_order_number() : '',
                'order_edit_url' => $order ? $order->get_edit_order_url() : '',
                'customer_name' => $customer ? $customer->display_name : __('Guest', 'wc-licensed-product'),
                'customer_email' => $customer ? $customer->user_email : '',
            ];
        }

        try {
            echo $this->twig->render('admin/licenses.html.twig', [
                'licenses' => $enrichedLicenses,
                'current_page' => $page,
                'total_pages' => $totalPages,
                'total_licenses' => $totalLicenses,
                'admin_url' => admin_url('admin.php?page=wc-licenses'),
                'notices' => $this->getNotices(),
            ]);
        } catch (\Exception $e) {
            // Fallback to PHP template
            $this->renderLicensesPageFallback($enrichedLicenses, $page, $totalPages, $totalLicenses);
        }
    }

    /**
     * Get admin notices
     */
    private function getNotices(): array
    {
        $notices = [];

        if (isset($_GET['updated'])) {
            $notices[] = ['type' => 'success', 'message' => __('License updated successfully.', 'wc-licensed-product')];
        }
        if (isset($_GET['deleted'])) {
            $notices[] = ['type' => 'success', 'message' => __('License deleted successfully.', 'wc-licensed-product')];
        }
        if (isset($_GET['revoked'])) {
            $notices[] = ['type' => 'success', 'message' => __('License revoked successfully.', 'wc-licensed-product')];
        }

        return $notices;
    }

    /**
     * Fallback render for licenses page
     */
    private function renderLicensesPageFallback(array $enrichedLicenses, int $page, int $totalPages, int $totalLicenses): void
    {
        ?>
        <div class="wrap">
            <h1><?php esc_html_e('Licenses', 'wc-licensed-product'); ?></h1>

            <?php foreach ($this->getNotices() as $notice): ?>
                <div class="notice notice-<?php echo esc_attr($notice['type']); ?> is-dismissible">
                    <p><?php echo esc_html($notice['message']); ?></p>
                </div>
            <?php endforeach; ?>

            <table class="wp-list-table widefat fixed striped">
                <thead>
                    <tr>
                        <th><?php esc_html_e('License Key', 'wc-licensed-product'); ?></th>
                        <th><?php esc_html_e('Product', 'wc-licensed-product'); ?></th>
                        <th><?php esc_html_e('Customer', 'wc-licensed-product'); ?></th>
                        <th><?php esc_html_e('Domain', 'wc-licensed-product'); ?></th>
                        <th><?php esc_html_e('Status', 'wc-licensed-product'); ?></th>
                        <th><?php esc_html_e('Expires', 'wc-licensed-product'); ?></th>
                        <th><?php esc_html_e('Actions', 'wc-licensed-product'); ?></th>
                    </tr>
                </thead>
                <tbody>
                    <?php if (empty($enrichedLicenses)): ?>
                        <tr>
                            <td colspan="7"><?php esc_html_e('No licenses found.', 'wc-licensed-product'); ?></td>
                        </tr>
                    <?php else: ?>
                        <?php foreach ($enrichedLicenses as $item): ?>
                            <tr>
                                <td><code><?php echo esc_html($item['license']->getLicenseKey()); ?></code></td>
                                <td>
                                    <?php if ($item['product_edit_url']): ?>
                                        <a href="<?php echo esc_url($item['product_edit_url']); ?>">
                                            <?php echo esc_html($item['product_name']); ?>
                                        </a>
                                    <?php else: ?>
                                        <?php echo esc_html($item['product_name']); ?>
                                    <?php endif; ?>
                                </td>
                                <td>
                                    <?php echo esc_html($item['customer_name']); ?>
                                    <?php if ($item['customer_email']): ?>
                                        <br><small><?php echo esc_html($item['customer_email']); ?></small>
                                    <?php endif; ?>
                                </td>
                                <td><?php echo esc_html($item['license']->getDomain()); ?></td>
                                <td>
                                    <span class="license-status license-status-<?php echo esc_attr($item['license']->getStatus()); ?>">
                                        <?php echo esc_html(ucfirst($item['license']->getStatus())); ?>
                                    </span>
                                </td>
                                <td>
                                    <?php
                                    $expiresAt = $item['license']->getExpiresAt();
                                    echo $expiresAt
                                        ? esc_html($expiresAt->format(get_option('date_format')))
                                        : esc_html__('Never', 'wc-licensed-product');
                                    ?>
                                </td>
                                <td>
                                    <?php if ($item['license']->getStatus() !== License::STATUS_REVOKED): ?>
                                        <a href="<?php echo esc_url(wp_nonce_url(
                                            admin_url('admin.php?page=wc-licenses&action=revoke&license_id=' . $item['license']->getId()),
                                            'revoke_license'
                                        )); ?>" class="button button-small" onclick="return confirm('<?php esc_attr_e('Are you sure?', 'wc-licensed-product'); ?>')">
                                            <?php esc_html_e('Revoke', 'wc-licensed-product'); ?>
                                        </a>
                                    <?php endif; ?>
                                    <a href="<?php echo esc_url(wp_nonce_url(
                                        admin_url('admin.php?page=wc-licenses&action=delete&license_id=' . $item['license']->getId()),
                                        'delete_license'
                                    )); ?>" class="button button-small button-link-delete" onclick="return confirm('<?php esc_attr_e('Are you sure you want to delete this license?', 'wc-licensed-product'); ?>')">
                                        <?php esc_html_e('Delete', 'wc-licensed-product'); ?>
                                    </a>
                                </td>
                            </tr>
                        <?php endforeach; ?>
                    <?php endif; ?>
                </tbody>
            </table>

            <?php if ($totalPages > 1): ?>
                <div class="tablenav bottom">
                    <div class="tablenav-pages">
                        <?php
                        echo paginate_links([
                            'base' => admin_url('admin.php?page=wc-licenses&paged=%#%'),
                            'format' => '',
                            'current' => $page,
                            'total' => $totalPages,
                        ]);
                        ?>
                    </div>
                </div>
            <?php endif; ?>
        </div>
        <?php
    }

    /**
     * Add license column to orders list
     */
    public function addOrdersLicenseColumn(array $columns): array
    {
        $newColumns = [];
        foreach ($columns as $key => $value) {
            $newColumns[$key] = $value;
            if ($key === 'order_status') {
                $newColumns['license'] = __('License', 'wc-licensed-product');
            }
        }
        return $newColumns;
    }

    /**
     * Display license column content
     */
    public function displayOrdersLicenseColumn(string $column, int $postId): void
    {
        if ($column !== 'license') {
            return;
        }

        $order = wc_get_order($postId);
        $this->outputLicenseColumnContent($order);
    }

    /**
     * Display license column content (HPOS)
     */
    public function displayOrdersLicenseColumnHpos(string $column, \WC_Order $order): void
    {
        if ($column !== 'license') {
            return;
        }

        $this->outputLicenseColumnContent($order);
    }

    /**
     * Output license column content
     */
    private function outputLicenseColumnContent(?\WC_Order $order): void
    {
        if (!$order) {
            echo '—';
            return;
        }

        $hasLicensedProduct = false;
        foreach ($order->get_items() as $item) {
            $product = $item->get_product();
            if ($product && $product->is_type('licensed')) {
                $hasLicensedProduct = true;
                break;
            }
        }

        if (!$hasLicensedProduct) {
            echo '—';
            return;
        }

        $domain = $order->get_meta('_licensed_product_domain');
        if ($domain) {
            echo '<span class="dashicons dashicons-admin-network"></span> ' . esc_html($domain);
        } else {
            echo '<span class="dashicons dashicons-warning" title="' . esc_attr__('No domain specified', 'wc-licensed-product') . '"></span>';
        }
    }
}