<?php
/**
 * License Email Controller
 *
 * @package Jeremias\WcLicensedProduct\Email
 */

declare(strict_types=1);

namespace Jeremias\WcLicensedProduct\Email;

use Jeremias\WcLicensedProduct\License\LicenseManager;

/**
 * Handles email notifications for licenses
 */
final class LicenseEmailController
{
    private LicenseManager $licenseManager;

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

    /**
     * Register WordPress hooks
     */
    private function registerHooks(): void
    {
        // Add license info to order completed email
        add_action('woocommerce_email_after_order_table', [$this, 'addLicenseInfoToEmail'], 20, 4);

        // Add license info to order details in emails
        add_action('woocommerce_order_item_meta_end', [$this, 'addLicenseToOrderItem'], 10, 4);

        // Schedule cron job for expiration warnings
        add_action('init', [$this, 'scheduleExpirationCheck']);

        // Cron action for checking expiring licenses
        add_action('wclp_check_expiring_licenses', [$this, 'sendExpirationWarnings']);
    }

    /**
     * Schedule the expiration check cron job
     */
    public function scheduleExpirationCheck(): void
    {
        if (!wp_next_scheduled('wclp_check_expiring_licenses')) {
            wp_schedule_event(time(), 'daily', 'wclp_check_expiring_licenses');
        }
    }

    /**
     * Send expiration warning emails
     */
    public function sendExpirationWarnings(): void
    {
        // Check for licenses expiring in 7 days
        $this->processExpirationWarnings(7, 'expiring_7_days');

        // Check for licenses expiring in 1 day
        $this->processExpirationWarnings(1, 'expiring_1_day');
    }

    /**
     * Process and send expiration warnings for a specific time frame
     *
     * @param int $days Days until expiration
     * @param string $notificationType Notification type identifier
     */
    private function processExpirationWarnings(int $days, string $notificationType): void
    {
        $licenses = $this->licenseManager->getLicensesExpiringSoon($days);

        foreach ($licenses as $license) {
            // Skip if already notified
            if ($this->licenseManager->wasExpirationNotified($license->getId(), $notificationType)) {
                continue;
            }

            // Send the warning email
            if ($this->sendExpirationWarningEmail($license, $days)) {
                // Mark as notified
                $this->licenseManager->markExpirationNotified($license->getId(), $notificationType);
            }
        }
    }

    /**
     * Send expiration warning email to customer
     *
     * @param \Jeremias\WcLicensedProduct\License\License $license License object
     * @param int $daysRemaining Days until expiration
     * @return bool Whether email was sent successfully
     */
    private function sendExpirationWarningEmail($license, int $daysRemaining): bool
    {
        $customer = get_userdata($license->getCustomerId());
        if (!$customer || !$customer->user_email) {
            return false;
        }

        $product = wc_get_product($license->getProductId());
        $productName = $product ? $product->get_name() : __('Unknown Product', 'wc-licensed-product');

        $siteName = get_bloginfo('name');
        $expiresAt = $license->getExpiresAt();
        $expirationDate = $expiresAt ? $expiresAt->format(get_option('date_format')) : '';

        // Email subject
        if ($daysRemaining === 1) {
            $subject = sprintf(
                /* translators: 1: Product name, 2: Site name */
                __('[%2$s] Your license for %1$s expires tomorrow', 'wc-licensed-product'),
                $productName,
                $siteName
            );
        } else {
            $subject = sprintf(
                /* translators: 1: Product name, 2: Number of days, 3: Site name */
                __('[%3$s] Your license for %1$s expires in %2$d days', 'wc-licensed-product'),
                $productName,
                $daysRemaining,
                $siteName
            );
        }

        // Email content
        $message = $this->buildExpirationWarningHtml($license, $customer, $productName, $daysRemaining, $expirationDate);

        // Send email
        $headers = [
            'Content-Type: text/html; charset=UTF-8',
            'From: ' . $siteName . ' <' . get_option('admin_email') . '>',
        ];

        return wp_mail($customer->user_email, $subject, $message, $headers);
    }

    /**
     * Build HTML content for expiration warning email
     *
     * @param \Jeremias\WcLicensedProduct\License\License $license License object
     * @param \WP_User $customer Customer user object
     * @param string $productName Product name
     * @param int $daysRemaining Days until expiration
     * @param string $expirationDate Formatted expiration date
     * @return string HTML email content
     */
    private function buildExpirationWarningHtml($license, $customer, string $productName, int $daysRemaining, string $expirationDate): string
    {
        $siteName = get_bloginfo('name');
        $siteUrl = home_url();
        $accountUrl = wc_get_account_endpoint_url('licenses');

        ob_start();
        ?>
        <!DOCTYPE html>
        <html>
        <head>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1.0">
        </head>
        <body style="font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: #333; max-width: 600px; margin: 0 auto; padding: 20px;">
            <div style="background: #f8f9fa; padding: 30px; border-radius: 8px;">
                <h1 style="color: #333; margin-top: 0; font-size: 24px;">
                    <?php esc_html_e('License Expiration Notice', 'wc-licensed-product'); ?>
                </h1>

                <p><?php printf(esc_html__('Hello %s,', 'wc-licensed-product'), esc_html($customer->display_name)); ?></p>

                <?php if ($daysRemaining === 1): ?>
                    <p style="color: #dc3545; font-weight: 600;">
                        <?php printf(
                            esc_html__('Your license for %s will expire tomorrow (%s).', 'wc-licensed-product'),
                            esc_html($productName),
                            esc_html($expirationDate)
                        ); ?>
                    </p>
                <?php else: ?>
                    <p style="color: #ffc107; font-weight: 600;">
                        <?php printf(
                            esc_html__('Your license for %1$s will expire in %2$d days (%3$s).', 'wc-licensed-product'),
                            esc_html($productName),
                            $daysRemaining,
                            esc_html($expirationDate)
                        ); ?>
                    </p>
                <?php endif; ?>

                <div style="background: #fff; padding: 20px; border-radius: 4px; margin: 20px 0; border: 1px solid #e5e5e5;">
                    <h3 style="margin-top: 0; font-size: 16px;"><?php esc_html_e('License Details', 'wc-licensed-product'); ?></h3>
                    <table style="width: 100%; border-collapse: collapse;">
                        <tr>
                            <td style="padding: 8px 0; color: #666;"><?php esc_html_e('Product:', 'wc-licensed-product'); ?></td>
                            <td style="padding: 8px 0; font-weight: 600;"><?php echo esc_html($productName); ?></td>
                        </tr>
                        <tr>
                            <td style="padding: 8px 0; color: #666;"><?php esc_html_e('License Key:', 'wc-licensed-product'); ?></td>
                            <td style="padding: 8px 0;">
                                <code style="background: #f5f5f5; padding: 3px 8px; border-radius: 3px; font-family: monospace;">
                                    <?php echo esc_html($license->getLicenseKey()); ?>
                                </code>
                            </td>
                        </tr>
                        <tr>
                            <td style="padding: 8px 0; color: #666;"><?php esc_html_e('Domain:', 'wc-licensed-product'); ?></td>
                            <td style="padding: 8px 0;"><?php echo esc_html($license->getDomain()); ?></td>
                        </tr>
                        <tr>
                            <td style="padding: 8px 0; color: #666;"><?php esc_html_e('Expires:', 'wc-licensed-product'); ?></td>
                            <td style="padding: 8px 0; color: #dc3545; font-weight: 600;"><?php echo esc_html($expirationDate); ?></td>
                        </tr>
                    </table>
                </div>

                <p><?php esc_html_e('To continue using this product, please renew your license before the expiration date.', 'wc-licensed-product'); ?></p>

                <p style="margin-top: 25px;">
                    <a href="<?php echo esc_url($accountUrl); ?>"
                       style="display: inline-block; background: #2271b1; color: #fff; padding: 12px 24px; text-decoration: none; border-radius: 4px; font-weight: 600;">
                        <?php esc_html_e('View My Licenses', 'wc-licensed-product'); ?>
                    </a>
                </p>

                <hr style="border: none; border-top: 1px solid #e5e5e5; margin: 30px 0;">

                <p style="font-size: 14px; color: #666; margin-bottom: 0;">
                    <?php printf(
                        esc_html__('This email was sent from %s.', 'wc-licensed-product'),
                        '<a href="' . esc_url($siteUrl) . '" style="color: #2271b1;">' . esc_html($siteName) . '</a>'
                    ); ?>
                </p>
            </div>
        </body>
        </html>
        <?php
        return ob_get_clean();
    }

    /**
     * Add license information to order completed email
     */
    public function addLicenseInfoToEmail(\WC_Order $order, bool $sentToAdmin, bool $plainText, $email): void
    {
        // Only add to completed order email sent to customer
        if ($sentToAdmin || !$email || $email->id !== 'customer_completed_order') {
            return;
        }

        $licenses = $this->getLicensesForOrder($order);
        if (empty($licenses)) {
            return;
        }

        if ($plainText) {
            $this->renderPlainTextLicenseInfo($licenses, $order);
        } else {
            $this->renderHtmlLicenseInfo($licenses, $order);
        }
    }

    /**
     * Add license key to order item in email
     */
    public function addLicenseToOrderItem(int $itemId, \WC_Order_Item $item, \WC_Order $order, bool $plainText): void
    {
        $product = $item->get_product();
        if (!$product || !$product->is_type('licensed')) {
            return;
        }

        $license = $this->licenseManager->getLicenseByOrderAndProduct($order->get_id(), $product->get_id());
        if (!$license) {
            return;
        }

        if ($plainText) {
            echo "\n" . esc_html__('License Key:', 'wc-licensed-product') . ' ' . esc_html($license->getLicenseKey()) . "\n";
        } else {
            ?>
            <div style="margin-top: 10px; padding: 10px; background-color: #f8f9fa; border-left: 3px solid #0073aa;">
                <strong><?php esc_html_e('License Key:', 'wc-licensed-product'); ?></strong>
                <code style="display: block; margin-top: 5px; padding: 5px; background: #fff; font-family: monospace;">
                    <?php echo esc_html($license->getLicenseKey()); ?>
                </code>
            </div>
            <?php
        }
    }

    /**
     * Get all licenses for an order
     */
    private function getLicensesForOrder(\WC_Order $order): array
    {
        $licenses = [];

        foreach ($order->get_items() as $item) {
            $product = $item->get_product();
            if ($product && $product->is_type('licensed')) {
                $license = $this->licenseManager->getLicenseByOrderAndProduct($order->get_id(), $product->get_id());
                if ($license) {
                    $licenses[] = [
                        'license' => $license,
                        'product_name' => $product->get_name(),
                    ];
                }
            }
        }

        return $licenses;
    }

    /**
     * Render license info in HTML format
     */
    private function renderHtmlLicenseInfo(array $licenses, \WC_Order $order): void
    {
        $domain = $order->get_meta('_licensed_product_domain');
        ?>
        <div style="margin: 20px 0; padding: 20px; background-color: #f8f9fa; border: 1px solid #e5e5e5; border-radius: 4px;">
            <h2 style="margin-top: 0; color: #333;"><?php esc_html_e('Your License Keys', 'wc-licensed-product'); ?></h2>

            <?php if ($domain): ?>
                <p style="margin-bottom: 15px;">
                    <strong><?php esc_html_e('Licensed Domain:', 'wc-licensed-product'); ?></strong>
                    <?php echo esc_html($domain); ?>
                </p>
            <?php endif; ?>

            <table style="width: 100%; border-collapse: collapse;">
                <thead>
                    <tr>
                        <th style="text-align: left; padding: 10px; border-bottom: 2px solid #ddd;"><?php esc_html_e('Product', 'wc-licensed-product'); ?></th>
                        <th style="text-align: left; padding: 10px; border-bottom: 2px solid #ddd;"><?php esc_html_e('License Key', 'wc-licensed-product'); ?></th>
                        <th style="text-align: left; padding: 10px; border-bottom: 2px solid #ddd;"><?php esc_html_e('Expires', 'wc-licensed-product'); ?></th>
                    </tr>
                </thead>
                <tbody>
                    <?php foreach ($licenses as $item): ?>
                        <tr>
                            <td style="padding: 10px; border-bottom: 1px solid #eee;"><?php echo esc_html($item['product_name']); ?></td>
                            <td style="padding: 10px; border-bottom: 1px solid #eee;">
                                <code style="background: #fff; padding: 3px 6px; font-family: monospace;">
                                    <?php echo esc_html($item['license']->getLicenseKey()); ?>
                                </code>
                            </td>
                            <td style="padding: 10px; border-bottom: 1px solid #eee;">
                                <?php
                                $expiresAt = $item['license']->getExpiresAt();
                                echo $expiresAt
                                    ? esc_html($expiresAt->format(get_option('date_format')))
                                    : esc_html__('Never', 'wc-licensed-product');
                                ?>
                            </td>
                        </tr>
                    <?php endforeach; ?>
                </tbody>
            </table>

            <p style="margin-top: 15px; margin-bottom: 0; font-size: 0.9em; color: #666;">
                <?php esc_html_e('You can also view your licenses in your account under "Licenses".', 'wc-licensed-product'); ?>
            </p>
        </div>
        <?php
    }

    /**
     * Render license info in plain text format
     */
    private function renderPlainTextLicenseInfo(array $licenses, \WC_Order $order): void
    {
        $domain = $order->get_meta('_licensed_product_domain');

        echo "\n\n";
        echo "==========================================================\n";
        echo esc_html__('YOUR LICENSE KEYS', 'wc-licensed-product') . "\n";
        echo "==========================================================\n\n";

        if ($domain) {
            echo esc_html__('Licensed Domain:', 'wc-licensed-product') . ' ' . esc_html($domain) . "\n\n";
        }

        foreach ($licenses as $item) {
            echo esc_html($item['product_name']) . "\n";
            echo esc_html__('License Key:', 'wc-licensed-product') . ' ' . esc_html($item['license']->getLicenseKey()) . "\n";

            $expiresAt = $item['license']->getExpiresAt();
            echo esc_html__('Expires:', 'wc-licensed-product') . ' ';
            echo $expiresAt
                ? esc_html($expiresAt->format(get_option('date_format')))
                : esc_html__('Never', 'wc-licensed-product');
            echo "\n\n";
        }

        echo esc_html__('You can also view your licenses in your account under "Licenses".', 'wc-licensed-product') . "\n";
        echo "==========================================================\n\n";
    }
}