Implement version 0.0.8 features

- Remove Current Version field from product license settings
- Derive current version from latest product version in database
- Refactor email system to use WooCommerce email notification classes
- Add LicenseExpirationEmail WC_Email class for expiration warnings
- Add customizable email templates (HTML and plain text)
- Update settings to link to WooCommerce email configuration
- Update translations for new email-related strings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/Email/LicenseEmailController.php

@@ -10,6 +10,7 @@ declare(strict_types=1);
 namespace Jeremias\WcLicensedProduct\Email;
 
 use Jeremias\WcLicensedProduct\License\LicenseManager;
+use Jeremias\WcLicensedProduct\Admin\SettingsController;
 
 /**
  * Handles email notifications for licenses
@@ -29,6 +30,9 @@ final class LicenseEmailController
      */
     private function registerHooks(): void
     {
+        // Register custom WooCommerce email classes
+        add_filter('woocommerce_email_classes', [$this, 'registerEmailClasses']);
+
         // Add license info to order completed email
         add_action('woocommerce_email_after_order_table', [$this, 'addLicenseInfoToEmail'], 20, 4);
 
@@ -40,6 +44,45 @@ final class LicenseEmailController
 
         // Cron action for checking expiring licenses
         add_action('wclp_check_expiring_licenses', [$this, 'sendExpirationWarnings']);
+
+        // Add email templates location for theme overrides
+        add_filter('woocommerce_locate_template', [$this, 'locateTemplate'], 10, 3);
+    }
+
+    /**
+     * Register custom email classes with WooCommerce
+     *
+     * @param array $email_classes Existing email classes
+     * @return array Modified email classes
+     */
+    public function registerEmailClasses(array $email_classes): array
+    {
+        $email_classes['WCLP_License_Expiration'] = new LicenseExpirationEmail();
+        return $email_classes;
+    }
+
+    /**
+     * Locate templates in plugin directory
+     *
+     * @param string $template Template path
+     * @param string $template_name Template name
+     * @param string $template_path Template path prefix
+     * @return string Modified template path
+     */
+    public function locateTemplate(string $template, string $template_name, string $template_path): string
+    {
+        // Only handle our email templates
+        if (strpos($template_name, 'emails/license-') !== 0) {
+            return $template;
+        }
+
+        $plugin_template = WC_LICENSED_PRODUCT_PLUGIN_DIR . 'templates/' . $template_name;
+
+        if (file_exists($plugin_template)) {
+            return $plugin_template;
+        }
+
+        return $template;
     }
 
     /**
@@ -57,20 +100,48 @@ final class LicenseEmailController
      */
     public function sendExpirationWarnings(): void
     {
-        // Check for licenses expiring in 7 days
-        $this->processExpirationWarnings(7, 'expiring_7_days');
+        // Check if expiration emails are enabled in settings
+        if (!SettingsController::isExpirationEmailsEnabled()) {
+            return;
+        }
 
-        // Check for licenses expiring in 1 day
-        $this->processExpirationWarnings(1, 'expiring_1_day');
+        // Get the WooCommerce email instance
+        $mailer = WC()->mailer();
+        $emails = $mailer->get_emails();
+
+        if (!isset($emails['WCLP_License_Expiration'])) {
+            return;
+        }
+
+        /** @var LicenseExpirationEmail $expirationEmail */
+        $expirationEmail = $emails['WCLP_License_Expiration'];
+
+        // Check if the email is enabled
+        if (!$expirationEmail->is_enabled()) {
+            return;
+        }
+
+        // Get configurable warning days
+        $firstWarningDays = SettingsController::getFirstWarningDays();
+        $secondWarningDays = SettingsController::getSecondWarningDays();
+
+        // Check for licenses expiring at first warning threshold
+        $this->processExpirationWarnings($expirationEmail, $firstWarningDays, 'expiring_first_warning');
+
+        // Check for licenses expiring at second warning threshold (if enabled)
+        if ($secondWarningDays > 0 && $secondWarningDays < $firstWarningDays) {
+            $this->processExpirationWarnings($expirationEmail, $secondWarningDays, 'expiring_second_warning');
+        }
     }
 
     /**
      * Process and send expiration warnings for a specific time frame
      *
+     * @param LicenseExpirationEmail $email Email instance
      * @param int $days Days until expiration
      * @param string $notificationType Notification type identifier
      */
-    private function processExpirationWarnings(int $days, string $notificationType): void
+    private function processExpirationWarnings(LicenseExpirationEmail $email, int $days, string $notificationType): void
     {
         $licenses = $this->licenseManager->getLicensesExpiringSoon($days);
 
@@ -80,166 +151,14 @@ final class LicenseEmailController
                 continue;
             }
 
-            // Send the warning email
-            if ($this->sendExpirationWarningEmail($license, $days)) {
+            // Send the warning email using WooCommerce email system
+            if ($email->trigger($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($siteName) . '</a>'
-                    ); ?>
-                </p>
-            </div>
-        </body>
-        </html>
-        <?php
-        return ob_get_clean();
-    }
-
     /**
      * Add license information to order completed email
      */
@@ -281,7 +200,7 @@ final class LicenseEmailController
             echo "\n" . esc_html__('License Key:', 'wc-licensed-product') . ' ' . esc_html($license->getLicenseKey()) . "\n";
         } else {
             ?>
-            <div style="margin-top: 10px; padding: 10px; background-color: #f8f9fa; border-left: 3px solid #0073aa;">
+            <div style="margin-top: 10px; padding: 10px; background-color: #f8f9fa; border-left: 3px solid #7f54b3;">
                 <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()); ?>
@@ -324,7 +243,7 @@ final class LicenseEmailController
         <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 ($domain): ?>
+            <?php if ($domain) : ?>
                 <p style="margin-bottom: 15px;">
                     <strong><?php esc_html_e('Licensed Domain:', 'wc-licensed-product'); ?></strong>
                     <?php echo esc_html($domain); ?>
@@ -340,7 +259,7 @@ final class LicenseEmailController
                     </tr>
                 </thead>
                 <tbody>
-                    <?php foreach ($licenses as $item): ?>
+                    <?php foreach ($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;">