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

declare(strict_types=1);

namespace Jeremias\WcLicensedProduct\Admin;

use Jeremias\WcLicensedProduct\License\LicenseManager;

/**
 * Integrates license statistics with WooCommerce Analytics
 */
class AnalyticsController
{
    private LicenseManager $licenseManager;

    public function __construct(LicenseManager $licenseManager)
    {
        $this->licenseManager = $licenseManager;
    }

    /**
     * Initialize analytics hooks
     */
    public function init(): void
    {
        // Add submenu under WooCommerce Analytics
        add_action('admin_menu', [$this, 'addAnalyticsSubmenu'], 99);

        // Register REST API endpoints for analytics data
        add_action('rest_api_init', [$this, 'registerRestRoutes']);

        // Add license stats to WooCommerce Admin data registry
        add_action('admin_enqueue_scripts', [$this, 'enqueueAnalyticsData']);

        // Add analytics navigation item (WC Admin)
        add_filter('woocommerce_navigation_menu_items', [$this, 'addNavigationItem']);

        // Register WooCommerce Analytics report page
        add_filter('woocommerce_analytics_report_menu_items', [$this, 'addAnalyticsReportMenuItem']);
    }

    /**
     * Add submenu page under WooCommerce menu
     */
    public function addAnalyticsSubmenu(): void
    {
        add_submenu_page(
            'woocommerce',
            __('License Statistics', 'wc-licensed-product'),
            __('License Statistics', 'wc-licensed-product'),
            'manage_woocommerce',
            'wc-license-statistics',
            [$this, 'renderStatisticsPage']
        );
    }

    /**
     * Add navigation item for WC Admin navigation
     */
    public function addNavigationItem(array $items): array
    {
        $items[] = [
            'id' => 'wc-license-statistics',
            'title' => __('License Statistics', 'wc-licensed-product'),
            'parent' => 'woocommerce-analytics',
            'path' => '/analytics/license-statistics',
        ];

        return $items;
    }

    /**
     * Add report menu item to WooCommerce Analytics
     */
    public function addAnalyticsReportMenuItem(array $report_pages): array
    {
        $report_pages[] = [
            'id' => 'wc-license-statistics',
            'title' => __('License Statistics', 'wc-licensed-product'),
            'parent' => 'woocommerce-analytics',
            'path' => '/analytics/license-statistics',
        ];

        return $report_pages;
    }

    /**
     * Register REST API routes for analytics data
     */
    public function registerRestRoutes(): void
    {
        register_rest_route('wc-licensed-product/v1', '/analytics/stats', [
            'methods' => \WP_REST_Server::READABLE,
            'callback' => [$this, 'getAnalyticsStats'],
            'permission_callback' => function () {
                return current_user_can('manage_woocommerce');
            },
            'args' => [
                'after' => [
                    'description' => __('Limit response to stats after a given date.', 'wc-licensed-product'),
                    'type' => 'string',
                    'format' => 'date-time',
                ],
                'before' => [
                    'description' => __('Limit response to stats before a given date.', 'wc-licensed-product'),
                    'type' => 'string',
                    'format' => 'date-time',
                ],
                'interval' => [
                    'description' => __('Time interval to aggregate stats.', 'wc-licensed-product'),
                    'type' => 'string',
                    'enum' => ['day', 'week', 'month', 'quarter', 'year'],
                    'default' => 'month',
                ],
            ],
        ]);

        register_rest_route('wc-licensed-product/v1', '/analytics/products', [
            'methods' => \WP_REST_Server::READABLE,
            'callback' => [$this, 'getProductStats'],
            'permission_callback' => function () {
                return current_user_can('manage_woocommerce');
            },
            'args' => [
                'per_page' => [
                    'description' => __('Maximum number of items to return.', 'wc-licensed-product'),
                    'type' => 'integer',
                    'default' => 10,
                ],
                'orderby' => [
                    'description' => __('Sort by this field.', 'wc-licensed-product'),
                    'type' => 'string',
                    'enum' => ['licenses_count', 'product_name'],
                    'default' => 'licenses_count',
                ],
                'order' => [
                    'description' => __('Order direction.', 'wc-licensed-product'),
                    'type' => 'string',
                    'enum' => ['asc', 'desc'],
                    'default' => 'desc',
                ],
            ],
        ]);
    }

    /**
     * Get analytics stats via REST API
     */
    public function getAnalyticsStats(\WP_REST_Request $request): \WP_REST_Response
    {
        $stats = $this->licenseManager->getStatistics();
        $interval = $request->get_param('interval') ?: 'month';

        // Get time-series data based on interval
        $timeSeriesData = $this->getTimeSeriesData($interval, $request->get_param('after'), $request->get_param('before'));

        return new \WP_REST_Response([
            'totals' => [
                'total_licenses' => $stats['total'],
                'active_licenses' => $stats['by_status']['active'] ?? 0,
                'inactive_licenses' => $stats['by_status']['inactive'] ?? 0,
                'expired_licenses' => $stats['by_status']['expired'] ?? 0,
                'revoked_licenses' => $stats['by_status']['revoked'] ?? 0,
                'lifetime_licenses' => $stats['lifetime'] ?? 0,
                'expiring_soon' => $stats['expiring_soon'] ?? 0,
            ],
            'intervals' => $timeSeriesData,
        ], 200);
    }

    /**
     * Get product statistics via REST API
     */
    public function getProductStats(\WP_REST_Request $request): \WP_REST_Response
    {
        $stats = $this->licenseManager->getStatistics();
        $perPage = $request->get_param('per_page') ?: 10;

        $productStats = array_slice($stats['by_product'] ?? [], 0, $perPage);

        return new \WP_REST_Response([
            'products' => $productStats,
        ], 200);
    }

    /**
     * Get time-series data for the specified interval
     */
    private function getTimeSeriesData(string $interval, ?string $after = null, ?string $before = null): array
    {
        global $wpdb;

        $tableName = $wpdb->prefix . 'wc_licensed_product_licenses';

        // Set default date range
        $endDate = $before ? new \DateTimeImmutable($before) : new \DateTimeImmutable();
        $startDate = $after ? new \DateTimeImmutable($after) : $endDate->modify('-12 months');

        // Build date format based on interval
        switch ($interval) {
            case 'day':
                $dateFormat = '%Y-%m-%d';
                $phpFormat = 'Y-m-d';
                break;
            case 'week':
                $dateFormat = '%Y-%u';
                $phpFormat = 'Y-W';
                break;
            case 'quarter':
                $dateFormat = "CONCAT(YEAR(created_at), '-Q', QUARTER(created_at))";
                $phpFormat = 'Y-\QQ';
                break;
            case 'year':
                $dateFormat = '%Y';
                $phpFormat = 'Y';
                break;
            case 'month':
            default:
                $dateFormat = '%Y-%m';
                $phpFormat = 'Y-m';
                break;
        }

        // Special handling for quarter since it's not a simple DATE_FORMAT
        if ($interval === 'quarter') {
            $sql = $wpdb->prepare(
                "SELECT {$dateFormat} as period, COUNT(*) as count
                 FROM {$tableName}
                 WHERE created_at >= %s AND created_at <= %s
                 GROUP BY period
                 ORDER BY period ASC",
                $startDate->format('Y-m-d 00:00:00'),
                $endDate->format('Y-m-d 23:59:59')
            );
        } else {
            $sql = $wpdb->prepare(
                "SELECT DATE_FORMAT(created_at, %s) as period, COUNT(*) as count
                 FROM {$tableName}
                 WHERE created_at >= %s AND created_at <= %s
                 GROUP BY period
                 ORDER BY period ASC",
                $dateFormat,
                $startDate->format('Y-m-d 00:00:00'),
                $endDate->format('Y-m-d 23:59:59')
            );
        }

        $results = $wpdb->get_results($sql, ARRAY_A);

        $data = [];
        foreach ($results as $row) {
            $data[] = [
                'interval' => $row['period'],
                'subtotals' => [
                    'licenses_count' => (int) $row['count'],
                ],
            ];
        }

        return $data;
    }

    /**
     * Enqueue license analytics data for WC Admin
     */
    public function enqueueAnalyticsData(): void
    {
        if (!function_exists('wc_admin_get_feature_config')) {
            return;
        }

        $screen = get_current_screen();
        if (!$screen || strpos($screen->id, 'woocommerce') === false) {
            return;
        }

        $stats = $this->licenseManager->getStatistics();

        wp_localize_script('wc-admin-app', 'wcLicenseStats', [
            'total' => $stats['total'],
            'active' => $stats['by_status']['active'] ?? 0,
            'inactive' => $stats['by_status']['inactive'] ?? 0,
            'expired' => $stats['by_status']['expired'] ?? 0,
            'revoked' => $stats['by_status']['revoked'] ?? 0,
            'lifetime' => $stats['lifetime'] ?? 0,
            'expiringSoon' => $stats['expiring_soon'] ?? 0,
            'endpoints' => [
                'stats' => rest_url('wc-licensed-product/v1/analytics/stats'),
                'products' => rest_url('wc-licensed-product/v1/analytics/products'),
            ],
        ]);
    }

    /**
     * Render the statistics page
     */
    public function renderStatisticsPage(): void
    {
        $stats = $this->licenseManager->getStatistics();

        // Render using Twig if available
        $plugin = \Jeremias\WcLicensedProduct\Plugin::getInstance();
        $twig = $plugin->getTwig();

        if ($twig) {
            try {
                echo $twig->render('admin/statistics.html.twig', [
                    'stats' => $stats,
                    'admin_url' => admin_url('admin.php'),
                    'rest_url' => rest_url('wc-licensed-product/v1/analytics/'),
                ]);
                return;
            } catch (\Twig\Error\LoaderError $e) {
                // Template not found, use fallback
            }
        }

        // Fallback PHP rendering
        $this->renderStatisticsPageFallback($stats);
    }

    /**
     * Fallback rendering for statistics page
     */
    private function renderStatisticsPageFallback(array $stats): void
    {
        ?>
        <div class="wrap wclp-statistics">
            <h1><?php esc_html_e('License Statistics', 'wc-licensed-product'); ?></h1>

            <div class="wclp-stats-overview">
                <div class="wclp-stat-cards">
                    <div class="wclp-stat-card">
                        <h3><?php esc_html_e('Total Licenses', 'wc-licensed-product'); ?></h3>
                        <span class="wclp-stat-number"><?php echo esc_html($stats['total']); ?></span>
                    </div>
                    <div class="wclp-stat-card wclp-stat-active">
                        <h3><?php esc_html_e('Active', 'wc-licensed-product'); ?></h3>
                        <span class="wclp-stat-number"><?php echo esc_html($stats['by_status']['active'] ?? 0); ?></span>
                    </div>
                    <div class="wclp-stat-card wclp-stat-inactive">
                        <h3><?php esc_html_e('Inactive', 'wc-licensed-product'); ?></h3>
                        <span class="wclp-stat-number"><?php echo esc_html($stats['by_status']['inactive'] ?? 0); ?></span>
                    </div>
                    <div class="wclp-stat-card wclp-stat-expired">
                        <h3><?php esc_html_e('Expired', 'wc-licensed-product'); ?></h3>
                        <span class="wclp-stat-number"><?php echo esc_html($stats['by_status']['expired'] ?? 0); ?></span>
                    </div>
                    <div class="wclp-stat-card wclp-stat-revoked">
                        <h3><?php esc_html_e('Revoked', 'wc-licensed-product'); ?></h3>
                        <span class="wclp-stat-number"><?php echo esc_html($stats['by_status']['revoked'] ?? 0); ?></span>
                    </div>
                </div>

                <?php if ($stats['expiring_soon'] > 0): ?>
                <div class="notice notice-warning">
                    <p>
                        <strong><?php esc_html_e('Attention:', 'wc-licensed-product'); ?></strong>
                        <?php
                        printf(
                            /* translators: %d: number of licenses */
                            _n(
                                '%d license is expiring within the next 30 days.',
                                '%d licenses are expiring within the next 30 days.',
                                $stats['expiring_soon'],
                                'wc-licensed-product'
                            ),
                            $stats['expiring_soon']
                        );
                        ?>
                        <a href="<?php echo esc_url(admin_url('admin.php?page=wc-licenses')); ?>">
                            <?php esc_html_e('View Licenses', 'wc-licensed-product'); ?>
                        </a>
                    </p>
                </div>
                <?php endif; ?>

                <div class="wclp-stats-details">
                    <div class="wclp-stat-box">
                        <h3><?php esc_html_e('License Types', 'wc-licensed-product'); ?></h3>
                        <table class="widefat striped">
                            <tbody>
                                <tr>
                                    <td><?php esc_html_e('Lifetime Licenses', 'wc-licensed-product'); ?></td>
                                    <td class="wclp-stat-value"><?php echo esc_html($stats['lifetime'] ?? 0); ?></td>
                                </tr>
                                <tr>
                                    <td><?php esc_html_e('Time-limited Licenses', 'wc-licensed-product'); ?></td>
                                    <td class="wclp-stat-value"><?php echo esc_html($stats['expiring'] ?? 0); ?></td>
                                </tr>
                                <tr>
                                    <td><?php esc_html_e('Expiring Soon (30 days)', 'wc-licensed-product'); ?></td>
                                    <td class="wclp-stat-value"><?php echo esc_html($stats['expiring_soon'] ?? 0); ?></td>
                                </tr>
                            </tbody>
                        </table>
                    </div>

                    <div class="wclp-stat-box">
                        <h3><?php esc_html_e('Top Products by Licenses', 'wc-licensed-product'); ?></h3>
                        <?php if (empty($stats['by_product'])): ?>
                            <p class="description"><?php esc_html_e('No license data available yet.', 'wc-licensed-product'); ?></p>
                        <?php else: ?>
                            <table class="widefat striped">
                                <thead>
                                    <tr>
                                        <th><?php esc_html_e('Product', 'wc-licensed-product'); ?></th>
                                        <th class="wclp-stat-value"><?php esc_html_e('Licenses', 'wc-licensed-product'); ?></th>
                                    </tr>
                                </thead>
                                <tbody>
                                    <?php foreach ($stats['by_product'] as $product): ?>
                                    <tr>
                                        <td><?php echo esc_html($product['product_name']); ?></td>
                                        <td class="wclp-stat-value"><?php echo esc_html($product['count']); ?></td>
                                    </tr>
                                    <?php endforeach; ?>
                                </tbody>
                            </table>
                        <?php endif; ?>
                    </div>

                    <div class="wclp-stat-box">
                        <h3><?php esc_html_e('Top Domains', 'wc-licensed-product'); ?></h3>
                        <?php if (empty($stats['top_domains'])): ?>
                            <p class="description"><?php esc_html_e('No license data available yet.', 'wc-licensed-product'); ?></p>
                        <?php else: ?>
                            <table class="widefat striped">
                                <thead>
                                    <tr>
                                        <th><?php esc_html_e('Domain', 'wc-licensed-product'); ?></th>
                                        <th class="wclp-stat-value"><?php esc_html_e('Licenses', 'wc-licensed-product'); ?></th>
                                    </tr>
                                </thead>
                                <tbody>
                                    <?php foreach ($stats['top_domains'] as $domain): ?>
                                    <tr>
                                        <td><code><?php echo esc_html($domain['domain']); ?></code></td>
                                        <td class="wclp-stat-value"><?php echo esc_html($domain['count']); ?></td>
                                    </tr>
                                    <?php endforeach; ?>
                                </tbody>
                            </table>
                        <?php endif; ?>
                    </div>
                </div>

                <div class="wclp-chart-section">
                    <h3><?php esc_html_e('Licenses Created (Last 12 Months)', 'wc-licensed-product'); ?></h3>
                    <?php if (empty($stats['monthly'])): ?>
                        <p class="description"><?php esc_html_e('No license data available yet.', 'wc-licensed-product'); ?></p>
                    <?php else: ?>
                        <div class="wclp-chart-container">
                            <div class="wclp-bar-chart">
                                <?php
                                $maxValue = max(1, max($stats['monthly']));
                                foreach ($stats['monthly'] as $month => $count):
                                    $height = ($count / $maxValue * 100);
                                ?>
                                <div class="wclp-bar-wrapper">
                                    <div class="wclp-bar" style="height: <?php echo esc_attr($height); ?>%;" title="<?php echo esc_attr($count); ?> <?php esc_attr_e('licenses', 'wc-licensed-product'); ?>">
                                        <span class="wclp-bar-value"><?php echo esc_html($count); ?></span>
                                    </div>
                                    <span class="wclp-bar-label"><?php echo esc_html(date_i18n('M Y', strtotime($month . '-01'))); ?></span>
                                </div>
                                <?php endforeach; ?>
                            </div>
                        </div>
                    <?php endif; ?>
                </div>
            </div>

            <div class="wclp-stats-actions">
                <h2><?php esc_html_e('Quick Actions', 'wc-licensed-product'); ?></h2>
                <div class="wclp-action-buttons">
                    <a href="<?php echo esc_url(admin_url('admin.php?page=wc-licenses')); ?>" class="button button-primary">
                        <span class="dashicons dashicons-admin-network"></span>
                        <?php esc_html_e('Manage Licenses', 'wc-licensed-product'); ?>
                    </a>
                    <a href="<?php echo esc_url(admin_url('admin.php?page=wc-licenses&action=export_csv')); ?>" class="button">
                        <span class="dashicons dashicons-download"></span>
                        <?php esc_html_e('Export to CSV', 'wc-licensed-product'); ?>
                    </a>
                    <a href="<?php echo esc_url(admin_url('admin.php?page=wc-settings&tab=licensed_product')); ?>" class="button">
                        <span class="dashicons dashicons-admin-generic"></span>
                        <?php esc_html_e('Settings', 'wc-licensed-product'); ?>
                    </a>
                </div>
            </div>

            <div class="wclp-api-info">
                <h3><?php esc_html_e('REST API Endpoints', 'wc-licensed-product'); ?></h3>
                <p class="description">
                    <?php esc_html_e('The following REST API endpoints are available for retrieving license statistics:', 'wc-licensed-product'); ?>
                </p>
                <table class="widefat striped">
                    <thead>
                        <tr>
                            <th><?php esc_html_e('Endpoint', 'wc-licensed-product'); ?></th>
                            <th><?php esc_html_e('Description', 'wc-licensed-product'); ?></th>
                        </tr>
                    </thead>
                    <tbody>
                        <tr>
                            <td><code>GET /wc-licensed-product/v1/analytics/stats</code></td>
                            <td><?php esc_html_e('Get license statistics with time-series data', 'wc-licensed-product'); ?></td>
                        </tr>
                        <tr>
                            <td><code>GET /wc-licensed-product/v1/analytics/products</code></td>
                            <td><?php esc_html_e('Get license counts by product', 'wc-licensed-product'); ?></td>
                        </tr>
                    </tbody>
                </table>
            </div>
        </div>
        <?php
    }
}