fictioneer-email-notifications/admin.php

<?php

// No direct access!
defined( 'ABSPATH' ) OR exit;

// =======================================================================================
// UPDATES
// =======================================================================================

/**
 * Check Github repository for a new release
 *
 * @since 0.1.0
 *
 * @return boolean True if there is a newer version, false if not.
 */

function fcnen_check_for_updates() {
  global $pagenow;

  // Setup
  $plugin_info = fcnen_get_plugin_info();
  $last_check_timestamp = strtotime( $plugin_info['last_update_check'] ?? 0 );
  $remote_version = $plugin_info['last_update_version'];
  $is_updates_page = $pagenow === 'update-core.php';

  // Only call API every 12 hours, otherwise check database (except on Updates page)
  if (
    ! $is_updates_page &&
    current_time( 'timestamp', true ) < $last_check_timestamp + HOUR_IN_SECONDS * 12
  ) {
    if ( ! $remote_version ) {
      return false;
    }

    return version_compare( $remote_version, FCNEN_RELEASE_TAG, '>' );
  }

  // Remember this check
  $plugin_info['last_update_check'] = current_time( 'mysql', 1 );

  // Request to repository
  $response = wp_remote_get(
    'https://api.github.com/repos/Tetrakern/fictioneer-email-notifications/releases/latest',
    array(
      'headers' => array(
        'User-Agent' => 'FICTIONEER_EMAIL_NOTIFICATIONS',
        'Accept' => 'application/vnd.github+json',
        'X-GitHub-Api-Version' => '2022-11-28'
      )
    )
  );

  // Abort if request failed or is not a 2xx success status code
  if ( is_wp_error( $response ) || wp_remote_retrieve_response_code( $response ) >= 300 ) {
    // Remember check to avoid continuous tries on each page load
    update_option( 'fcnen_plugin_info', $plugin_info );

    return false;
  }

  // Decode JSON to array
  $release = json_decode( wp_remote_retrieve_body( $response ), true );
  $release_tag = sanitize_text_field( $release['tag_name'] ?? '' );

  // Abort if request did not return expected data
  if ( ! $release_tag ) {
    return false;
  }

  // Add to plugin info
  $plugin_info['last_update_version'] = $release_tag;
  $plugin_info['last_update_notes'] = sanitize_textarea_field( $release['body'] ?? '' );
  $plugin_info['last_update_nag'] = '';

  // Update info in database
  update_option( 'fcnen_plugin_info', $plugin_info );

  // Compare with currently installed version
  return version_compare( $release_tag, FCNEN_RELEASE_TAG, '>' );
}

/**
 * Show notice when a newer version is available
 *
 * @since 0.1.0
 */

function fcnen_admin_update_notice() {
  // Guard
  if ( ! current_user_can( 'install_themes' ) || ! fcnen_check_for_updates() ) {
    return;
  }

  global $pagenow;

  // Setup
  $plugin_info = fcnen_get_plugin_info();
  $last_update_nag = strtotime( $plugin_info['last_update_nag'] ?? 0 );
  $is_updates_page = $pagenow == 'update-core.php';

  // Show only once every minute (except on Updates page)
  if ( ! $is_updates_page && current_time( 'timestamp', true ) < $last_update_nag + 60 ) {
    return;
  }

  // Render notice
  $notes = fcnen_prepare_release_notes( $plugin_info['last_update_notes'] ?? '' );

  wp_admin_notice(
    sprintf(
      __( '<strong>Fictioneer Email Notifications %1$s</strong> is available. Please <a href="%2$s" target="_blank">download</a> and install the latest version at your next convenience.%3$s', 'fcnen' ),
      $plugin_info['last_update_version'],
      'https://github.com/Tetrakern/fictioneer-email-notifications/releases',
      $notes ? '<br><details><summary>' . __( 'Release Notes', 'fcnen' ) . '</summary>' . $notes . '</details>' : ''
    ),
    array(
      'type' => 'warning',
      'dismissible' => true,
      'additional_classes' => ['fictioneer-update-notice']
    )
  );

  // Remember notice
  $plugin_info['last_update_nag'] = current_time( 'mysql', 1 );

  // Update info in database
  update_option( 'fcnen_plugin_info', $plugin_info );
}
add_action( 'admin_notices', 'fcnen_admin_update_notice' );

/**
 * Extracts the release notes from the update message
 *
 * @since 0.1.0
 *
 * @param string $message  Update message received.
 *
 * @return string The release notes or original message if not found.
 */

function fcnen_prepare_release_notes( $message ) {
  $pos = strpos( $message, '### Release Notes' );

  if ( $pos !== false ) {
    $message = trim( substr( $message, $pos + strlen( '### Release Notes' ) ) );
    $lines = explode( "\n", $message );
    $notes = '';

    foreach ( $lines as $line ) {
      $line = trim( $line );

      if ( strpos( $line, '* ' ) === 0 ) {
        $notes .= '<li>' . substr( $line, 2 ) . '</li>';
      } else {
        $notes .= $line;
      }
    }

    if ( strpos( $notes, '<li>' ) !== false ) {
      return "<ul>{$notes}</ul>";
    } else {
      return "<p>{$notes}</p>";
    }
  }

  return "<p>{$message}</p>";
}

// =======================================================================================
// REGISTER WITH THEME
// =======================================================================================

/**
 * Adds plugin card to theme settings plugin tab
 *
 * @since 0.1.0
 */

function fcnen_settings_card() {
  // Setup
  $settings_url = esc_url( admin_url( 'admin.php?page=fcnen-settings' ) );

  // Start HTML ---> ?>
  <div class="fictioneer-card fictioneer-card--plugin">
    <div class="fictioneer-card__wrapper">
      <h3 class="fictioneer-card__header"><?php _e( 'Fictioneer Email Notifications', 'fcnen' ); ?></h3>
      <div class="fictioneer-card__content">

        <div class="fictioneer-card__row">
          <p><?php
            _e( '<strong>Allows readers to subscribe to selected updates via email.</strong> You can choose to receive notifications for all new content, specific post types, or selected stories and taxonomies. Works for both guests and registered users.', 'fcnen' );
          ?></p>
        </div>

        <div class="fictioneer-card__row">
          <p><?php
            printf(
              __( 'Active Subscribers: %d &bull; Unconfirmed Subscribers: %d &bull; Triggered Emails: %d', 'fcnen' ),
              fcnen_get_subscribers_count(),
              fcnen_get_subscribers_count( false ),
              absint( get_option( 'fcnen_triggered_email_count' ) ?: 0 )
            );
          ?></p>
        </div>

        <div class="fictioneer-card__row fictioneer-card__row--meta">
          <?php printf( __( 'Version %s', 'fcnen' ), FCNEN_VERSION ); ?>
          |
          <?php printf( __( 'By <a href="%s">Tetrakern</a>', 'fcnen' ), 'https://github.com/Tetrakern' ); ?>
          |
          <a href="<?php echo $settings_url; ?>"><?php _e( 'Settings', 'fcnen' ); ?></a>
          |
          <a href="https://ko-fi.com/tetrakern"><?php _e( 'Ko-fi', 'fcnen' ); ?></a>
          |
          <a href="https://www.patreon.com/tetrakern"><?php _e( 'Patreon', 'fcnen' ); ?></a>
        </div>

      </div>
    </div>
  </div>
  <?php // <--- End HTML
}

if ( is_admin() ) {
  add_action( 'fictioneer_admin_settings_plugins', 'fcnen_settings_card' );
}

/**
 * Checks whether the requirements are fulfilled, deactivates plugin if not
 *
 * @since 0.1.0
 */

function fcnen_check_plugin_requirements() {
  // Setup
  $current_theme = wp_get_theme();
  $theme_name = $current_theme->get( 'Name' );
  $current_version = $current_theme->get( 'Version' );

  // Child or parent theme?
  if ( $current_theme->parent() ) {
    $theme_name = $current_theme->parent()->get( 'Name' );
    $current_version = $current_theme->parent()->get( 'Version' );
  }

  // Theme name must be Fictioneer!
  if ( $theme_name !== 'Fictioneer' ) {
    require_once( ABSPATH . 'wp-admin/includes/plugin.php' );

    // Deactivate plugin
    deactivate_plugins( 'fictioneer-email-notifications/fictioneer-email-notifications.php' );

    // Display admin notice
    wp_admin_notice(
      __( 'Fictioneer Email Notifications requires the Fictioneer theme or a child theme. The plugin has been deactivated.', 'fcnen' ),
      array(
        'type' => 'error',
        'dismissible' => true
      )
    );
  }

  // Must be Fictioneer 5.19.0 or higher
  if ( version_compare( $current_version, '5.19.0', '<' ) ) {
    require_once( ABSPATH . 'wp-admin/includes/plugin.php' );

    // Deactivate plugin
    deactivate_plugins( 'fictioneer-email-notifications/fictioneer-email-notifications.php' );

    // Display admin notice
    wp_admin_notice(
      __( 'Fictioneer Email Notifications requires the Fictioneer theme, version 5.19.0 or higher. The plugin has been deactivated.', 'fcnen' ),
      array(
        'type' => 'error',
        'dismissible' => true
      )
    );
  }
}

if ( is_admin() ) {
  add_action( 'after_setup_theme', 'fcnen_check_plugin_requirements' );
}

// =======================================================================================
// SETTINGS
// =======================================================================================

/**
 * Register settings for the plugin
 *
 * @since 0.1.0
 */

function fcnen_register_settings() {
  // General
  register_setting( 'fcnen_general_group', 'fcnen_from_email_address', 'sanitize_email' );
  register_setting( 'fcnen_general_group', 'fcnen_from_email_name', 'sanitize_text_field' );
  register_setting( 'fcnen_general_group', 'fcnen_flag_subscribe_to_stories', 'absint' );
  register_setting( 'fcnen_general_group', 'fcnen_flag_subscribe_to_taxonomies', 'absint' );
  register_setting( 'fcnen_general_group', 'fcnen_flag_allow_passwords', 'absint' );
  register_setting( 'fcnen_general_group', 'fcnen_flag_allow_hidden', 'absint' );
  register_setting( 'fcnen_general_group', 'fcnen_flag_disable_blocked_enqueue', 'absint' );
  register_setting( 'fcnen_general_group', 'fcnen_flag_purge_on_deactivation', 'absint' );
  register_setting( 'fcnen_general_group', 'fcnen_excerpt_length', 'absint' );
  register_setting( 'fcnen_general_group', 'fcnen_max_per_term', 'absint' );
  register_setting( 'fcnen_general_group', 'fcnen_api_key', 'sanitize_text_field' );
  register_setting( 'fcnen_general_group', 'fcnen_api_bulk_limit', 'absint' );
  register_setting( 'fcnen_general_group', 'fcnen_excluded_posts', 'fcnen_sanitize_comma_separated_list' );
  register_setting( 'fcnen_general_group', 'fcnen_excluded_authors', 'fcnen_sanitize_comma_separated_list' );
  register_setting( 'fcnen_general_group', 'fcnen_excluded_emails', 'fcnen_sanitize_email_list' );

  // Templates
  register_setting( 'fcnen_template_group', 'fcnen_template_layout_confirmation', 'wp_kses_post' );
  register_setting( 'fcnen_template_group', 'fcnen_template_subject_confirmation', 'sanitize_text_field' );

  register_setting( 'fcnen_template_group', 'fcnen_template_layout_code', 'wp_kses_post' );
  register_setting( 'fcnen_template_group', 'fcnen_template_subject_code', 'sanitize_text_field' );

  register_setting( 'fcnen_template_group', 'fcnen_template_layout_edit', 'wp_kses_post' );
  register_setting( 'fcnen_template_group', 'fcnen_template_subject_edit', 'sanitize_text_field' );

  register_setting( 'fcnen_template_group', 'fcnen_template_layout_notification', 'wp_kses_post' );
  register_setting( 'fcnen_template_group', 'fcnen_template_subject_notification', 'sanitize_text_field' );

  register_setting( 'fcnen_template_group', 'fcnen_template_loop_part_post', 'wp_kses_post' );
  register_setting( 'fcnen_template_group', 'fcnen_template_loop_part_story', 'wp_kses_post' );
  register_setting( 'fcnen_template_group', 'fcnen_template_loop_part_chapter', 'wp_kses_post' );
}
add_action( 'admin_init', 'fcnen_register_settings' );

/**
 * Sanitizes and returns a comma-separated list as array
 *
 * @since 0.1.0
 *
 * @param string $value  The value to sanitize.
 *
 * @return array The value as array.
 */

function fcnen_sanitize_comma_separated_list( $value ) {
  if ( is_array( $value ) ) {
    return $value;
  }

  $value = sanitize_text_field( $value );
  $value = fictioneer_explode_list( $value );
  $value = array_map( 'absint', $value );
  $value = array_map( 'strval', $value );

  return array_unique( $value );
}

/**
 * Sanitizes and returns an email list as array
 *
 * @since 0.1.0
 *
 * @param string $value  The value to sanitize.
 *
 * @return array The value as array.
 */

function fcnen_sanitize_email_list( $value ) {
  if ( is_array( $value ) ) {
    return $value;
  }

  $value = sanitize_textarea_field( $value ); // Initial sanitization
  $value = str_replace( ["\n", "\r"], "\n", $value ); // Unify line breaks
  $emails = array_filter( explode( "\n", $value ) ); // Explode and filter out empty
  $sanitized_emails = [];

  foreach ( $emails as $email ) {
    $email = sanitize_email( $email );

    if ( is_email( $email ) ) {
      $sanitized_emails[] = $email;
    }
  }

  return array_unique( $sanitized_emails );
}

// =======================================================================================
// INCLUDES
// =======================================================================================

require_once( plugin_dir_path( __FILE__ ) . 'actions.php' );
require_once( plugin_dir_path( __FILE__ ) . 'classes/class-subscribers-table.php' );
require_once( plugin_dir_path( __FILE__ ) . 'classes/class-notifications-table.php' );

// =======================================================================================
// SETUP
// =======================================================================================

/**
 * Enqueues styles and scripts in the admin
 *
 * @since 0.1.0
 *
 * @param string $hook_suffix  The current admin page.
 */

function fcnen_enqueue_admin_scripts( $hook_suffix ) {
  // Setup
  $screen = get_current_screen();

  // Plugin menus
  if ( strpos( $_GET['page'] ?? '', 'fcnen-' ) !== false ) {
    wp_enqueue_style( 'fcnen-admin-styles', plugin_dir_url( __FILE__ ) . '/css/fcnen-admin.css', [], FCNEN_VERSION );

    wp_enqueue_script(
      'fcnen-admin-scripts',
      plugin_dir_url( __FILE__ ) . '/js/fcnen-admin.min.js',
      ['fictioneer-utility-scripts'],
      FCNEN_VERSION,
      true
    );
  }

  // Post edit screens
  if ( $screen && in_array( $screen->post_type, ['post', 'fcn_story', 'fcn_chapter'] ) ) {
    wp_enqueue_style( 'fcnen-admin-styles', plugin_dir_url( __FILE__ ) . '/css/fcnen-admin.css', [], FCNEN_VERSION );
  }
}
add_action( 'admin_enqueue_scripts', 'fcnen_enqueue_admin_scripts' );

/**
 * Enqueues CodeMirror for the plugin's code editor
 *
 * @since 01.0
 */

function fcnen_enqueue_codemirror() {
  $cm_settings['codeEditor'] = wp_enqueue_code_editor( array( 'type' => 'text/css' ) );
  wp_localize_script( 'jquery', 'cm_settings', $cm_settings );
  wp_enqueue_script( 'wp-theme-plugin-editor' );
  wp_enqueue_style( 'wp-codemirror' );
}
add_action( 'admin_enqueue_scripts', 'fcnen_enqueue_codemirror' );

/**
 * Change text in bottom-left corner of the admin panel
 *
 * @since 0.1.0
 *
 * @param string $default  Default footer text.
 */

function fcnen_admin_footer_text( $default ) {
  if ( strpos( $_GET['page'] ?? '', 'fcnen-' ) !== false ) {
    return sprintf(
      _x( 'Fictioneer Email Notifications %s', 'Admin page footer text.', 'fcnen' ),
      FCNEN_VERSION
    );
  }

  return $default;
}
add_filter( 'admin_footer_text', 'fcnen_admin_footer_text' );

/**
 * Adds removable query arguments (admin only)
 *
 * @since 0.1.0
 *
 * @param array $args  Array of removable query arguments.
 *
 * @return array Extended list of query args.
 */

function fcnen_add_removable_admin_args( $args ) {
  return array_merge( $args, ['fcnen-notice', 'fcnen-message'] );
}
add_filter( 'removable_query_args', 'fcnen_add_removable_admin_args' );

// =======================================================================================
// NOTICES
// =======================================================================================

/**
 * Show plugin admin notices
 *
 * Displays an admin notice based on the query parameter 'fcnen-notice'
 * and optionally 'fcnen-message' for additional information.
 *
 * @since 0.1.0
 */

function fcnen_admin_notices() {
  // Setup
  $notice = '';
  $type = 'info';
  $message = sanitize_text_field( $_GET['fcnen-message'] ?? '' );
  $maybe_id = is_numeric( $message ) ? absint( $message ) : 0;
  $maybe_post = get_post( $maybe_id );
  $post_title = empty( $maybe_post ) ? __( 'UNAVAILABLE', 'fcnen' ) : $maybe_post->post_title;

  // Default notices
  if ( ( $_GET['settings-updated'] ?? 0 ) === 'true' ) {
    $notice = __( 'Settings saved' );
    $type = 'success';
  }

  // FCNEN notices
  switch ( $_GET['fcnen-notice'] ?? 0 ) {
    case 'subscriber-already-exists':
      $notice = __( 'Error. Subscriber with that email address already exists.', 'fcnen' );
      $type = 'error';
      break;
    case 'subscriber-adding-success':
      $notice = sprintf( __( '%s added.', 'fcnen' ), $message ?: __( 'Subscriber', 'fcnen' ) );
      $type = 'success';
      break;
    case 'subscriber-adding-failure':
      $notice = sprintf( __( 'Error. %s could not be added.', 'fcnen' ), $message ?: __( 'Subscriber', 'fcnen' ) );
      $type = 'error';
      break;
    case 'confirm-subscriber-success':
      $notice = sprintf( __( 'Subscriber (#%s) confirmed.', 'fcnen' ), $message ?: __( 'n/a', 'fcnen' ) );
      $type = 'success';
      break;
    case 'confirm-subscriber-failure':
      $notice = sprintf(
        __( 'Error. Subscriber (#%s) could not be confirmed.', 'fcnen' ),
        $message ?: __( 'n/a', 'fcnen' )
      );
      $type = 'error';
      break;
    case 'unconfirm-subscriber-success':
      $notice = sprintf( __( 'Subscriber (#%s) unconfirmed.', 'fcnen' ), $message ?: __( 'n/a', 'fcnen' ) );
      $type = 'success';
      break;
    case 'unconfirm-subscriber-failure':
      $notice = sprintf(
        __( 'Error. Subscriber (#%s) could not be unconfirmed.', 'fcnen' ),
        $message ?: __( 'n/a', 'fcnen' )
      );
      $type = 'error';
      break;
    case 'trash-subscriber-success':
      $notice = sprintf( __( 'Subscriber (#%s) trashed.', 'fcnen' ), $message ?: __( 'n/a', 'fcnen' ) );
      $type = 'success';
      break;
    case 'trash-subscriber-failure':
      $notice = sprintf(
        __( 'Error. Subscriber (#%s) could not be trashed.', 'fcnen' ),
        $message ?: __( 'n/a', 'fcnen' )
      );
      $type = 'error';
      break;
    case 'restore-subscriber-success':
      $notice = sprintf( __( 'Subscriber (#%s) restored.', 'fcnen' ), $message ?: __( 'n/a', 'fcnen' ) );
      $type = 'success';
      break;
    case 'restore-subscriber-failure':
      $notice = sprintf(
        __( 'Error. Subscriber (#%s) could not be restored.', 'fcnen' ),
        $message ?: __( 'n/a', 'fcnen' )
      );
      $type = 'error';
      break;
    case 'delete-subscriber-success':
      $notice = sprintf( __( 'Subscriber (#%s) permanently deleted.', 'fcnen' ), $message ?: __( 'n/a', 'fcnen' ) );
      $type = 'success';
      break;
    case 'delete-subscriber-failure':
      $notice = sprintf(
        __( 'Error. Subscriber (#%s) could not be deleted.', 'fcnen' ),
        $message ?: __( 'n/a', 'fcnen' )
      );
      $type = 'error';
      break;
    case 'bulk-confirm-subscribers-success':
      $notice = sprintf( __( 'Confirmed %s subscribers.', 'fcnen' ), $message ?: '0' );
      $type = 'success';
      break;
    case 'bulk-confirm-subscribers-failure':
      $notice = __( 'Error. Could not confirm subscribers.', 'fcnen' );
      $type = 'error';
      break;
    case 'bulk-unconfirm-subscribers-success':
      $notice = sprintf( __( 'Unconfirmed %s subscribers.', 'fcnen' ), $message ?: '0' );
      $type = 'success';
      break;
    case 'bulk-unconfirm-subscribers-failure':
      $notice = __( 'Error. Could not unconfirm subscribers.', 'fcnen' );
      $type = 'error';
      break;
    case 'bulk-trash-subscribers-success':
      $notice = sprintf( __( 'Trashed %s subscribers.', 'fcnen' ), $message ?: '0' );
      $type = 'success';
      break;
    case 'bulk-trash-subscribers-failure':
      $notice = __( 'Error. Could not trash subscribers.', 'fcnen' );
      $type = 'error';
      break;
    case 'bulk-restore-subscribers-success':
      $notice = sprintf( __( 'Restored %s subscribers.', 'fcnen' ), $message ?: '0' );
      $type = 'success';
      break;
    case 'bulk-restore-subscribers-failure':
      $notice = __( 'Error. Could not restore subscribers.', 'fcnen' );
      $type = 'error';
      break;
    case 'bulk-delete-subscribers-success':
      $notice = sprintf( __( 'Permanently deleted %s subscribers.', 'fcnen' ), $message ?: '0' );
      $type = 'success';
      break;
    case 'bulk-delete-subscribers-failure':
      $notice = __( 'Error. Could not delete subscribers.', 'fcnen' );
      $type = 'error';
      break;
    case 'confirmation-email-resent':
      $notice = sprintf( __( 'Confirmation email resent to subscriber (#%s).', 'fcnen' ), $message ?: __( 'n/a', 'fcnen' ) );
      $type = 'success';
      break;
    case 'code-email-sent':
      $notice = sprintf( __( 'Email with edit code sent to subscriber (#%s).', 'fcnen' ), $message ?: __( 'n/a', 'fcnen' ) );
      $type = 'success';
      break;
    case 'emptied-trashed-subscribers':
      $notice = __( 'Emptied trash.', 'fcnen' );
      $type = 'success';
      break;
    case 'csv-imported':
      $notice = sprintf( __( '%s subscriber(s) imported from CSV.', 'fcnen' ), $message ?: 0 );
      $type = 'success';
      break;
    case 'delete-notification-success':
      $notice = sprintf( __( 'Deleted notification for "%s" (#%s).', 'fcnen' ), $post_title, $maybe_id );
      $type = 'success';
      break;
    case 'delete-notification-failure':
      $notice = sprintf( __( 'Error. Could not delete notification for "%s" (#%s).', 'fcnen' ), $post_title, $maybe_id );
      $type = 'error';
      break;
    case 'paused-notification-success':
      $notice = sprintf( __( 'Paused notification for "%s" (#%s).', 'fcnen' ), $post_title, $maybe_id );
      $type = 'success';
      break;
    case 'paused-notification-failure':
      $notice = sprintf( __( 'Error. Could not pause notification for "%s" (#%s).', 'fcnen' ), $post_title, $maybe_id );
      $type = 'error';
      break;
    case 'unpaused-notification-success':
      $notice = sprintf( __( 'Unpaused notification for "%s" (#%s).', 'fcnen' ), $post_title, $maybe_id );
      $type = 'success';
      break;
    case 'unpaused-notification-failure':
      $notice = sprintf( __( 'Error. Could not unpause notification for "%s" (#%s).', 'fcnen' ), $post_title, $maybe_id );
      $type = 'error';
      break;
    case 'unsent-notification-success':
      $notice = sprintf( __( 'Notification for "%s" (#%s) marked as unsent.', 'fcnen' ), $post_title, $maybe_id );
      $type = 'success';
      break;
    case 'unsent-notification-failure':
      $notice = sprintf( __( 'Error. Could not mark notification for "%s" (#%s) as unsent.', 'fcnen' ), $post_title, $maybe_id );
      $type = 'error';
      break;
    case 'remove-sent-notification-success':
      $notice = __( 'Deleted sent notifications.', 'fcnen' );
      $type = 'success';
      break;
    case 'remove-sent-notification-failure':
      $notice = __( 'Error. Could not delete sent notifications.', 'fcnen' );
      $type = 'error';
      break;
    case 'bulk-delete-notifications-success':
      $notice = sprintf( __( 'Deleted %s notifications.', 'fcnen' ), $message ?: '0' );
      $type = 'success';
      break;
    case 'bulk-delete-notifications-failure':
      $notice = __( 'Error. Could not delete notifications.', 'fcnen' );
      $type = 'error';
      break;
    case 'bulk-unsent-notifications-success':
      $notice = sprintf( __( 'Marked %s notifications as unsent.', 'fcnen' ), $message ?: '0' );
      $type = 'success';
      break;
    case 'bulk-unsent-notifications-failure':
      $notice = __( 'Error. Could not mark notifications as unsent.', 'fcnen' );
      $type = 'error';
      break;
    case 'bulk-pause-notifications-success':
      $notice = sprintf( __( 'Paused %s notifications.', 'fcnen' ), $message ?: '0' );
      $type = 'success';
      break;
    case 'bulk-pause-notifications-failure':
      $notice = __( 'Error. Could not pause notifications.', 'fcnen' );
      $type = 'error';
      break;
    case 'bulk-unpause-notifications-success':
      $notice = sprintf( __( 'Unpaused %s notifications.', 'fcnen' ), $message ?: '0' );
      $type = 'success';
      break;
    case 'bulk-unpause-notifications-failure':
      $notice = __( 'Error. Could not unpause notifications.', 'fcnen' );
      $type = 'error';
      break;
    case 'submit-notification-successful':
      $notice = sprintf( __( 'Added notification for "%s" (#%s).', 'fcnen' ), $post_title, $maybe_id );
      $type = 'success';
      break;
    case 'submit-notification-failure':
      $notice = sprintf( __( 'Error. Could not add notification for "%s" (#%s).', 'fcnen' ), $post_title, $maybe_id );
      $type = 'error';
      break;
    case 'submit-notification-duplicate':
      $notice = sprintf( __( 'Error. There is already an unsent notification queued for "%s" (#%s).', 'fcnen' ), $post_title, $maybe_id );
      $type = 'error';
      break;
    case 'submit-notification-post-not-found':
      $notice = sprintf( __( 'Error. Post #%s not found.', 'fcnen' ), $maybe_id );
      $type = 'error';
      break;
    case 'submit-notification-post-unpublished':
      $notice = sprintf( __( 'Error. Post #%s is not published.', 'fcnen' ), $maybe_id );
      $type = 'error';
      break;
    case 'submit-notification-post-protected':
      $notice = sprintf( __( 'Error. Post #%s is protected.', 'fcnen' ), $maybe_id );
      $type = 'error';
      break;
    case 'submit-notification-post-invalid-type':
      $notice = sprintf( __( 'Error. Post #%s is of an invalid type.', 'fcnen' ), $maybe_id );
      $type = 'error';
      break;
    case 'submit-notification-post-excluded':
      $notice = sprintf( __( 'Error. Post #%s is excluded from email notifications.', 'fcnen' ), $maybe_id );
      $type = 'error';
      break;
    case 'submit-notification-post-hidden':
      $notice = sprintf( __( 'Error. Post #%s is hidden.', 'fcnen' ), $maybe_id );
      $type = 'error';
      break;
    case 'queue-cleared':
      $notice = __( 'Cleared email queue.', 'fcnen' );
      $type = 'success';
      break;
    case 'mailersend-api-quota-received':
      $notice = $message;
      $type = 'success';
      break;
    case 'mailersend-api-quota-error':
      $notice = $message;
      $type = 'error';
      break;
  }

  // Render notice
  if ( ! empty( $notice ) ) {
    wp_admin_notice(
      $notice,
      array(
        'type' => $type,
        'dismissible' => true
      )
    );
  }
}
add_action( 'admin_notices', 'fcnen_admin_notices' );

// =======================================================================================
// SAVE SCREEN OPTIONS
// =======================================================================================

/**
 * Save custom screen options values
 *
 * @since 0.1.0
 *
 * @param bool   $status  The current status of the screen option saving.
 * @param string $option  The name of the screen option being saved.
 * @param mixed  $value   The value of the screen option being saved.
 *
 * @return bool The updated status of the screen option saving.
 */

function fcnen_save_screen_options( $status, $option, $value ) {
  // Subscribers per page
  if ( $option === 'fcnen_subscribers_per_page' ) {
    update_user_meta( get_current_user_id(), $option, $value );
  }

  // Updated per page
  if ( $option === 'fcnen_notifications_per_page' ) {
    update_user_meta( get_current_user_id(), $option, $value );
  }

  return $status;
}
add_filter( 'set-screen-option', 'fcnen_save_screen_options', 10, 3 );

// =======================================================================================
// ADMIN NOTIFICATIONS PAGE
// =======================================================================================

/**
 * Add notifications admin menu page
 *
 * @since 0.1.0
 */

function fcnen_add_notifications_menu_page() {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    return;
  }

  // Add admin page
  $hook = add_menu_page(
    'Email Notifications',
    'Notifications',
    'manage_options',
    'fcnen-notifications',
    'fcnen_notifications_page',
    'dashicons-email-alt'
  );

  // Add screen options
  if ( $hook ) {
    add_action( "load-{$hook}", 'fcnen_notifications_table_screen_options' );
  }
}
add_action( 'admin_menu', 'fcnen_add_notifications_menu_page' );

/**
 * Configure the screen options for the notifications page
 *
 * @since 0.1.0
 * @global WP_List_Table $notifications_table  The notifications table instance.
 */

function fcnen_notifications_table_screen_options() {
  global $notifications_table;

  // Add pagination option
	$args = array(
		'label' => __( 'Notifications per page', 'fcnen' ),
		'default' => 25,
		'option' => 'fcnen_notifications_per_page'
	);
	add_screen_option( 'per_page', $args );

  // Setup table
  $notifications_table = new FCNEN_Notifications_Table();

  // Perform table actions
  $notifications_table->perform_actions();
}

/**
 * Callback for the notifications menu page
 *
 * @since 0.1.0
 */

function fcnen_notifications_page() {
  global $notifications_table;

  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    wp_die( __( 'You do not have permission to access this page.', 'fcnen' ) );
  }

  // Setup
  $notifications_table->prepare_items();

  // Start HTML ---> ?>
  <div id="fcnen-admin-page-notifications" class="wrap fcnen-settings _notifications">
    <h1 class="wp-heading-inline"><?php _e( 'Notifications', 'fcnen' ); ?></h1>
    <button class="page-title-action" data-fcnen-open-modal="fcnen-modal-add-notification"><?php _e( 'Add Notification', 'fcnen' ); ?></button>
    <hr class="wp-header-end">
    <div class="fcnen-settings__content">
      <div class="fcnen-settings__table fcnen-notifications-table-wrapper">
        <?php $notifications_table->display_views(); ?>
        <form method="post"><?php
          $notifications_table->search_box( 'Search Notifications', 'search-notifications' );
          $notifications_table->display();
        ?></form>
      </div>
    </div>
  </div>

  <dialog class="fcnen-modal" id="fcnen-modal-add-notification">
    <form method="POST" action="<?php echo admin_url( 'admin-post.php?action=fcnen_submit_notification' ); ?>" class="fcnen-modal__wrapper">
      <?php wp_nonce_field( 'submit-notification', 'fcnen-nonce' ); ?>
      <div class="fcnen-modal__header"><?php _e( 'Add Notification', 'fcnen' ); ?></div>
      <div class="fcnen-modal__content">
        <p><?php _e( 'You can add blog posts, stories, and chapters by ID (you can find that in the URL). Make sure the post is not excluded, private, duplicate, and so forth.', 'fcnen' ); ?></p>
        <div class="fcnen-input-wrap">
          <input type="text" name="post_id" id="fcnen-add-notification-post-id" placeholder="<?php echo esc_attr_x( 'Post ID', 'Add notification input placeholder.', 'fcnen' ); ?>" autocomplete="off" spellcheck="false" autocorrect="off" data-1p-ignore required>
        </div>
      </div>
      <div class="fcnen-modal__actions">
        <button value="cancel" formmethod="dialog" class="button" formnovalidate><?php _e( 'Cancel', 'fcnen' ); ?></button>
        <button type="submit" class="button button-primary"><?php _e( 'Add', 'fcnen' ); ?></button>
      </div>
    </form>
  </dialog>
  <?php // <--- End HTML
}

// =======================================================================================
// QUEUE PAGE
// =======================================================================================

/**
 * Add sending admin submenu page
 *
 * @since 0.1.0
 */

function fcnen_add_send_emails_menu_page() {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    return;
  }

  // Add admin page
  add_submenu_page(
    'fcnen-notifications',
    'Send Emails',
    'Send Emails',
    'manage_options',
    'fcnen-send-emails',
    'fcnen_send_emails_page'
  );
}
add_action( 'admin_menu', 'fcnen_add_send_emails_menu_page' );

/**
 * Callback for the sending submenu page
 *
 * @since 0.1.0
 */

function fcnen_send_emails_page() {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    wp_die( __( 'You do not have permission to access this page.', 'fcnen' ) );
  }

  // Setup
  $statistics = fcnen_get_queue_statistics();
  $queue_incomplete = get_transient( 'fcnen_request_queue' );
  $queue_html = __( 'Click the button to generate and start the next queue.', 'fcnen' );
  $clear_url = wp_nonce_url( admin_url( 'admin-post.php?action=fcnen_clear_queue' ), 'fcnen-clear-queue', 'fcnen-nonce' );
  $disabled = ! get_option( 'fcnen_api_key' ) || ( $statistics['emails'] < 1 && ! $queue_incomplete );

  // Incomplete queue?
  if ( $queue_incomplete ) {
    $queue_html = fcnen_build_queue_html( $queue_incomplete['batches'] );
  }

  // Nothing to send?
  if ( $disabled ) {
    $queue_html = __( 'Nothing to send.', 'fcnen' );
  }

  // Start HTML ---> ?>
  <div id="fcnen-admin-page-send-emails" class="wrap fcnen-settings _send-emails">
    <h1 class="wp-heading-inline"><?php _e( 'Send Emails', 'fcnen' ); ?></h1>
    <hr class="wp-header-end">

    <div class="fcnen-queue-stats">

      <div class="fcnen-queue-stats__item">
        <div class="fcnen-queue-stats__item-value _posts"><?php echo $statistics['sendable']; ?></div>
        <div class="fcnen-queue-stats__item-label _posts"><?php
          echo _nx( 'Post', 'Posts', $statistics['sendable'], 'Queue statistics.', 'fcnen' );
        ?></div>
      </div>

      <div class="fcnen-queue-stats__item">
        <div class="fcnen-queue-stats__item-value _blocked"><?php echo $statistics['blocked']; ?></div>
        <div class="fcnen-queue-stats__item-label _blocked"><?php
          _ex( 'Blocked', 'Queue statistics.', 'fcnen' );
        ?></div>
      </div>

      <div class="fcnen-queue-stats__item">
        <div class="fcnen-queue-stats__item-value _emails"><?php echo $statistics['emails']; ?></div>
        <div class="fcnen-queue-stats__item-label _emails"><?php
          echo _nx( 'Email', 'Emails', $statistics['emails'], 'Queue statistics.', 'fcnen' );
        ?></div>
      </div>

      <div class="fcnen-queue-stats__item">
        <div class="fcnen-queue-stats__item-value _batches"><?php
          printf(
            _x( '%s | %s', 'Queue statistics: Batches | Size.', 'fcnen' ),
            $statistics['batches'],
            $statistics['batch_limit']
          )
        ?></div>
        <div class="fcnen-queue-stats__item-label _batches"><?php
          echo _nx( 'Batch', 'Batches', $statistics['batches'], 'Queue statistics.', 'fcnen' );
        ?></div>
      </div>

      <div class="fcnen-queue-stats__item">
        <div class="fcnen-queue-stats__item-value _last-sent"><?php echo $statistics['last_sent']; ?></div>
        <div class="fcnen-queue-stats__item-label _last-sent"><?php _ex( 'Last Sent', 'Queue statistics.', 'fcnen' ); ?></div>
      </div>

    </div>

    <?php if ( $queue_incomplete ) : ?>
      <h2 class="title"><?php _e( 'Previous Queue (Incomplete)', 'fcnen' ); ?></h2>
      <p><?php _e( 'An incomplete queue has been found. You can try to resend unsuccessful batches or clear the queue to start the next set of notifications. Incomplete queues are stored for 24 hours.', 'fcnen' ); ?></p>
    <?php else : ?>
      <h2 class="title"><?php _e( 'Queue', 'fcnen' ); ?></h2>
    <?php endif; ?>

    <div class="fcnen-queue-wrapper" data-finder="fcnen-email-queue" data-api-limit="<?php echo FCNEN_API_LIMIT; ?>" data-api-interval="<?php echo FCNEN_API_INTERVAL; ?>" data-pause-message="<?php esc_attr_e( 'Waiting for API reset', 'fcnen' ); ?>"><?php echo $queue_html; ?></div>

    <div class="fcnen-queue-actions">
      <button type="button" class="button button-primary" data-click-action="fcnen-work-queue" <?php echo $disabled ? 'disabled' : ''; ?>><?php
        if ( get_option( 'fcnen_api_key' ) ) {
          echo $queue_incomplete ? __( 'Retry', 'fcnen' ) : __( 'Send Emails', 'fcnen' );
        } else {
          _e( 'API key missing', 'fcnen' );
        }
      ?></button>
      <?php if ( $queue_incomplete ) : ?>
        <a href="<?php echo $clear_url; ?>" class="button"><?php _e( 'Clear Queue', 'fcnen' ); ?></a>
      <?php endif; ?>
    </div>

    <?php wp_nonce_field( 'fcnen-process-email-queue', 'fcnen_queue_nonce' ); ?>
  <?php // <--- End HTML
}

// =======================================================================================
// ADMIN SUBSCRIBERS PAGE
// =======================================================================================

/**
 * Add subscribers admin submenu page
 *
 * @since 0.1.0
 */

function fcnen_add_subscribers_menu_page() {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    return;
  }

  // Add admin page
  $hook = add_submenu_page(
    'fcnen-notifications',
    'Subscribers',
    'Subscribers',
    'manage_options',
    'fcnen-subscribers',
    'fcnen_subscribers_page'
  );

  // Add screen options
  if ( $hook ) {
    add_action( "load-{$hook}", 'fcnen_subscribers_table_screen_options' );
  }
}
add_action( 'admin_menu', 'fcnen_add_subscribers_menu_page' );

/**
 * Configure the screen options for the subscribers page
 *
 * @since 0.1.0
 * @global WP_List_Table $subscribers_table  The subscribers table instance.
 */

function fcnen_subscribers_table_screen_options() {
  global $subscribers_table;

  // Add pagination option
	$args = array(
		'label' => __( 'Subscribers per page', 'fcnen' ),
		'default' => 25,
		'option' => 'fcnen_subscribers_per_page'
	);
	add_screen_option( 'per_page', $args );

  // Setup table
  $subscribers_table = new FCNEN_Subscribers_Table();

  // Perform table actions
  $subscribers_table->perform_actions();
}

/**
 * Callback for the subscribers submenu page
 *
 * @since 0.1.0
 */

function fcnen_subscribers_page() {
  global $subscribers_table;

  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    wp_die( __( 'You do not have permission to access this page.', 'fcnen' ) );
  }

  // Setup
  $subscribers_table->prepare_items();

  // Start HTML ---> ?>
  <div id="fcnen-admin-page-subscribers" class="wrap fcnen-settings _subscribers">
    <h1 class="wp-heading-inline"><?php _e( 'Subscribers', 'fcnen' ); ?></h1>
    <button class="page-title-action" data-fcnen-open-modal="fcnen-modal-add-subscriber"><?php _e( 'Add Subscriber', 'fcnen' ); ?></button>
    <hr class="wp-header-end">
    <div class="fcnen-settings__content">
      <div class="fcnen-settings__table fcnen-subscribers-table-wrapper">
        <?php $subscribers_table->display_views(); ?>
        <form method="post"><?php
          $subscribers_table->search_box( 'Search Emails', 'search_id' );
          $subscribers_table->display();
        ?></form>
      </div>
    </div>
  </div>

  <dialog class="fcnen-modal" id="fcnen-modal-add-subscriber">
    <form method="POST" action="<?php echo admin_url( 'admin-post.php?action=fcnen_submit_subscriber' ); ?>" class="fcnen-modal__wrapper">
      <?php wp_nonce_field( 'submit-subscriber', 'fcnen-nonce' ); ?>
      <div class="fcnen-modal__header"><?php _e( 'Add Subscriber', 'fcnen' ); ?></div>
      <div class="fcnen-modal__content">
        <p><?php _e( 'Add a subscriber, optionally already confirmed.', 'fcnen' ); ?></p>
        <div class="fcnen-input-wrap">
          <input type="email" name="email" id="fcnen-submit-subscriber-email" placeholder="<?php esc_attr_e( 'Email Address', 'fcnen' ); ?>" autocomplete="off" spellcheck="false" autocorrect="off" data-1p-ignore required>
        </div>
        <div class="fcnen-horizontal-wrap">
          <div class="fcnen-checkbox-wrap">
            <input type="checkbox" name="confirmed" id="fcnen-submit-subscriber-confirm" value="1">
            <label for="fcnen-submit-subscriber-confirm"><?php _e( 'Confirmed', 'fcnen' ); ?></label>
          </div>
          <div class="fcnen-checkbox-wrap">
            <input type="checkbox" name="everything" id="fcnen-submit-subscriber-everything" value="1" checked>
            <label for="fcnen-submit-subscriber-everything"><?php _e( 'Everything', 'fcnen' ); ?></label>
          </div>
          <div class="fcnen-checkbox-wrap">
            <input type="checkbox" name="posts" id="fcnen-submit-subscriber-posts" value="1">
            <label for="fcnen-submit-subscriber-posts"><?php _e( 'Blogs', 'fcnen' ); ?></label>
          </div>
          <div class="fcnen-checkbox-wrap">
            <input type="checkbox" name="stories" id="fcnen-submit-subscriber-stories" value="1">
            <label for="fcnen-submit-subscriber-stories"><?php _e( 'Stories', 'fcnen' ); ?></label>
          </div>
          <div class="fcnen-checkbox-wrap">
            <input type="checkbox" name="chapters" id="fcnen-submit-subscriber-chapters" value="1">
            <label for="fcnen-submit-subscriber-chapters"><?php _e( 'Chapters', 'fcnen' ); ?></label>
          </div>
        </div>
      </div>
      <div class="fcnen-modal__actions">
        <button value="cancel" formmethod="dialog" class="button" formnovalidate><?php _e( 'Cancel', 'fcnen' ); ?></button>
        <button type="submit" class="button button-primary"><?php _e( 'Add', 'fcnen' ); ?></button>
      </div>
    </form>
  </dialog>

  <dialog class="fcnen-modal" id="fcnen-modal-import-csv">
    <form method="POST" action="<?php echo admin_url( 'admin-post.php?action=fcnen_import_subscribers_csv' ); ?>" enctype="multipart/form-data" class="fcnen-modal__wrapper">
      <?php wp_nonce_field( 'fcnen-import-csv', 'fcnen-nonce' ); ?>
      <div class="fcnen-modal__header"><?php _e( 'Import CSV', 'fcnen' ); ?></div>
      <div class="fcnen-modal__content">
        <p><?php _e( 'Import subscribers from a CSV file. Keep in mind that scopes are saved as IDs and may not match if the associated terms have changed.', 'fcnen' ); ?></p>
        <div class="fcnen-input-wrap _file">
          <input type="file" name="csv-file" id="fcnen-import-csv-file" hidden required>
          <label for="fcnen-import-csv-file" class="fcnen-input-wrap__file-button"><?php _e( 'Choose File', 'fcnen' ); ?></label>
          <label for="fcnen-import-csv-file" class="fcnen-input-wrap__file-field"><?php _e( 'No file chosen', 'fcnen' ); ?></label>
        </div>
        <div class="fcnen-checkbox-wrap">
          <input type="checkbox" name="reset-scopes" id="fcnen-import-csv-reset-scopes" value="1">
          <label for="fcnen-import-csv-reset-scopes"><?php _e( 'Reset Scopes', 'fcnen' ); ?></label>
        </div>
      </div>
      <div class="fcnen-modal__actions">
        <button value="cancel" formmethod="dialog" class="button" formnovalidate><?php _e( 'Cancel', 'fcnen' ); ?></button>
        <button type="submit" class="button button-primary"><?php _e( 'Import', 'fcnen' ); ?></button>
      </div>
    </form>
  </dialog>
  <?php // <--- End HTML
}

// =======================================================================================
// TEMPLATES PAGE
// =======================================================================================

/**
 * Add settings admin submenu page
 *
 * @since 0.1.0
 */

function fcnen_add_templates_menu_page() {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    return;
  }

  // Add admin page
  add_submenu_page(
    'fcnen-notifications',
    'Templates',
    'Templates',
    'manage_options',
    'fcnen-templates',
    'fcnen_templates_page'
  );
}
add_action( 'admin_menu', 'fcnen_add_templates_menu_page' );

/**
 * Callback for the templates submenu page
 *
 * @since 0.1.0
 */

function fcnen_templates_page() {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    wp_die( __( 'You do not have permission to access this page.', 'fcnen' ) );
  }

  // Setup
  $defaults = fcnen_option_defaults();

  $subject_confirmation = get_option( 'fcnen_template_subject_confirmation' );
  $layout_confirmation = get_option(
    'fcnen_template_layout_confirmation',
    $defaults['fcnen_template_layout_confirmation'] ?? ''
  );

  $subject_code = get_option( 'fcnen_template_subject_code' );
  $layout_code = get_option( 'fcnen_template_layout_code', $defaults['fcnen_template_layout_code'] ?? '' );

  $subject_edit = get_option( 'fcnen_template_subject_edit' );
  $layout_edit = get_option( 'fcnen_template_layout_edit', $defaults['fcnen_template_layout_edit'] ?? '' );

  $subject_notification = get_option( 'fcnen_template_subject_notification' );
  $layout_notification = get_option(
    'fcnen_template_layout_notification',
    $defaults['fcnen_template_layout_notification'] ?? ''
  );

  $loop_part_post = get_option( 'fcnen_template_loop_part_post', $defaults['fcnen_template_loop_part_post'] ?? '' );
  $loop_part_story = get_option( 'fcnen_template_loop_part_story', $defaults['fcnen_template_loop_part_story'] ?? '' );
  $loop_part_chapter = get_option( 'fcnen_template_loop_part_chapter', $defaults['fcnen_template_loop_part_chapter'] ?? '' );

  // Preview replacements
  $preview_replacements = array(
    '{{id}}' => '####',
    '{{updates}}' => $loop_part_post . "\n" . $loop_part_story . "\n" . $loop_part_chapter, // Do this first!
    '{{site_name}}' => get_bloginfo( 'name' ),
    '{{author}}' => _x( 'Author', 'Preview replacement string.', 'fcnen' ),
    '{{title}}' => _x( 'Preview Title', 'Preview replacement string.', 'fcnen' ),
    '{{story_title}}' => _x( 'Preview Story Title', 'Preview replacement string.', 'fcnen' ),
    '{{excerpt}}' => _x( 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec vel lacus luctus, laoreet augue vitae, dignissim arcu. Curabitur fermentum euismod justo et luctus. Cras sit amet gravida libero.', 'Preview replacement string.', 'fcnen' ),
    '{{date}}' => date( get_option( 'date_format' ) ),
    '{{time}}' => date( get_option( 'time_format' ) ),
    '{{code}}' => wp_generate_password( 32, false ),
    '{{email}}' => _x( 'subscriber@email.com', 'Preview replacement string.', 'fcnen' ),
    '{{type}}' => _x( 'Type', 'Preview replacement string.', 'fcnen' ),
    '{{scope_post_types}}' => _x( 'Blogs, Stories, Chapters', 'Preview replacement string.', 'fcnen' ),
    '{{scope_stories}}' => _x( 'Dracula, Sherlock Holmes, My Immortal', 'Preview replacement string.', 'fcnen' ),
    '{{scope_categories}}' => _x( 'External, Wholesome, Creepy', 'Preview replacement string.', 'fcnen' ),
    '{{scope_tags}}' => _x( 'Amnesia, Dystopian, Magical Girls', 'Preview replacement string.', 'fcnen' ),
    '{{scope_genres}}' => _x( 'Science Fiction, Solarpunk, Cosmic Horror', 'Preview replacement string.', 'fcnen' ),
    '{{scope_fandoms}}' => _x( 'Original, Sol Bianca, Little Witch Academia', 'Preview replacement string.', 'fcnen' ),
    '{{scope_characters}}' => _x( 'Twilight Sparkle, Luz Noceda, Rebecca', 'Preview replacement string.', 'fcnen' ),
    '{{scope_warnings}}' => _x( 'Profanity, Violence, Gore', 'Preview replacement string.', 'fcnen' ),
    '{{site_link}}' => '#',
    '{{activation_link}}' => '#',
    '{{unsubscribe_link}}' => '#',
    '{{edit_link}}' => '#',
    '{{story_link}}' => '#',
    '{{thumbnail}}' => "data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='300'><rect width='100%' height='100%' fill='%23333'/></svg>"
  );

  // Start HTML ---> ?>
  <script><?php echo 'var fcnen_preview_replacements = ' . json_encode( $preview_replacements ) . ';'; ?></script>
  <div id="fcnen-admin-page-settings" class="wrap fcnen-settings _settings">
    <h1 class="wp-heading-inline"><?php _e( 'Templates', 'fcnen' ); ?></h1>
    <hr class="wp-header-end">
    <p class="fcnen-replacement-tokens"><?php _e( 'You can edit the subject, layout, and style of emails. Make sure to always include the necessary replacement tokens. Use <code>{{#token}}</code>content<code>{{/token}}</code> to only render the middle part if the token is <em>not</em> empty, and  <code>{{^token}}</code>content<code>{{/token}}</code> for when the token <em>is empty.</em>', 'fcnen' ); ?></p>
    <div class="fcnen-settings__content">
      <form method="POST" action="options.php">
        <?php
          settings_fields( 'fcnen_template_group' );
          do_settings_sections( 'fcnen_template_group' );
        ?>
        <table class="form-table" role="presentation">
          <tbody>
            <tr>
              <td class="td-full">
                <select id="fcnen-select-template">
                  <option value=""><?php _e( '— Select a template to edit —', 'fcnen' ); ?></option>
                  <option value="layout-confirmation"><?php _e( 'Confirmation Layout', 'fcnen' ); ?></option>
                  <option value="layout-code"><?php _e( 'Code Layout', 'fcnen' ); ?></option>
                  <option value="layout-edit"><?php _e( 'Edit Layout', 'fcnen' ); ?></option>
                  <option value="layout-notification"><?php _e( 'Notification Layout', 'fcnen' ); ?></option>
                  <option value="loop-part-post"><?php _e( 'Post Loop Partial', 'fcnen' ); ?></option>
                  <option value="loop-part-story"><?php _e( 'Story Loop Partial', 'fcnen' ); ?></option>
                  <option value="loop-part-chapter"><?php _e( 'Chapter Loop Partial', 'fcnen' ); ?></option>
                </select>
                <div class="fcnen-template-wrapper hidden" id="layout-confirmation">
                  <p class="fcnen-replacement-tokens"><?php _e( 'This email is sent when a new subscription is submitted, prompting the subscriber to confirm as security measure against fraudulent submissions. Anyone could enter anyone’s email address, after all. If not confirmed within 24 hours, the subscription and all data will be deleted once the cleanup cron job runs (every 12 hours).', 'fcnen' ); ?></p>
                  <div class="fcnen-left-right-wrap">
                    <label for="fcnen-template-subject-confirmation" class="offset-top"><?php _e( 'Subject', 'fcnen' ); ?></label>
                    <div class="fcnen-input-wrap">
                      <input type="text" name="fcnen_template_subject_confirmation" id="fcnen-template-subject-confirmation" placeholder="<?php echo $defaults['fcnen_template_subject_confirmation']; ?>" value="<?php echo $subject_confirmation; ?>">
                    </div>
                  </div>
                  <textarea name="fcnen_template_layout_confirmation" id="fcnen-template-layout-confirmation" class="fcnen-codemirror"><?php echo esc_textarea( $layout_confirmation ); ?></textarea>
                  <p class="fcnen-replacement-tokens">
                    <code>{{site_name}}</code>
                    <code>{{site_link}}</code>
                    <code>{{activation_link}}</code>
                    <code>{{unsubscribe_link}}</code>
                    <code>{{edit_link}}</code>
                    <code>{{email}}</code>
                    <code>{{code}}</code>
                    <code>{{id}}</code>
                  </p>
                  <details class="fcnen-default-code">
                    <summary><?php _e( 'Default HTML', 'fcnen' ); ?></summary>
                    <pre>
                      <code><?php echo esc_textarea( $defaults['fcnen_template_layout_confirmation'] ?? '' ); ?></code>
                    </pre>
                  </details>
                  <div class="fcnen-action-wrap">
                    <?php submit_button( __( 'Save Templates', 'fcnen' ), 'primary', 'submit', false ); ?>
                  </div>
                </div>
                <div class="fcnen-box__row fcnen-box__vertical fcnen-template-wrapper hidden" id="layout-code">
                  <p class="fcnen-replacement-tokens"><?php _e( 'This email can be manually triggered in the subscriber list, sending the edit code to a confirmed subscriber along with an edit link for convenience. This should normally not be required since the code should be included in all other emails anyway, but people are people.', 'fcnen' ); ?></p>
                  <div class="fcnen-left-right-wrap">
                    <label for="fcnen-template-subject-code" class="offset-top"><?php _e( 'Subject', 'fcnen' ); ?></label>
                    <div class="fcnen-input-wrap">
                      <input type="text" name="fcnen_template_subject_code" id="fcnen-template-subject-code" placeholder="<?php echo $defaults['fcnen_template_subject_code']; ?>" value="<?php echo $subject_code; ?>">
                    </div>
                  </div>
                  <textarea name="fcnen_template_layout_code" id="fcnen-template-layout-code" class="fcnen-codemirror"><?php echo esc_textarea( $layout_code ); ?></textarea>
                  <p class="fcnen-replacement-tokens">
                    <code>{{site_name}}</code>
                    <code>{{site_link}}</code>
                    <code>{{activation_link}}</code>
                    <code>{{unsubscribe_link}}</code>
                    <code>{{edit_link}}</code>
                    <code>{{email}}</code>
                    <code>{{code}}</code>
                    <code>{{id}}</code>
                  </p>
                  <details class="fcnen-default-code">
                    <summary><?php _e( 'Default HTML', 'fcnen' ); ?></summary>
                    <pre>
                      <code><?php echo esc_textarea( $defaults['fcnen_template_layout_code'] ?? '' ); ?></code>
                    </pre>
                  </details>
                  <div class="fcnen-action-wrap">
                    <?php submit_button( __( 'Save Templates', 'fcnen' ), 'primary', 'submit', false ); ?>
                  </div>
                </div>
                <div class="fcnen-box__row fcnen-box__vertical fcnen-template-wrapper hidden" id="layout-edit">
                  <p class="fcnen-replacement-tokens"><?php _e( 'This email is sent whenever a subscriber updates their preferences, both as confirmation and security notification about the change. Just in case a malicious actor managed to acquire both their email address and code.', 'fcnen' ); ?></p>
                  <div class="fcnen-left-right-wrap">
                    <label for="fcnen-template-subject-edit" class="offset-top"><?php _e( 'Subject', 'fcnen' ); ?></label>
                    <div class="fcnen-input-wrap">
                      <input type="text" name="fcnen_template_subject_edit" id="fcnen-template-subject-edit" placeholder="<?php echo $defaults['fcnen_template_subject_edit']; ?>" value="<?php echo $subject_edit; ?>">
                    </div>
                  </div>
                  <textarea name="fcnen_template_layout_edit" id="fcnen-template-layout-edit" class="fcnen-codemirror"><?php echo esc_textarea( $layout_edit ); ?></textarea>
                  <p class="fcnen-replacement-tokens">
                    <code>{{site_name}}</code>
                    <code>{{site_link}}</code>
                    <code>{{activation_link}}</code>
                    <code>{{unsubscribe_link}}</code>
                    <code>{{edit_link}}</code>
                    <code>{{email}}</code>
                    <code>{{code}}</code>
                    <code>{{id}}</code>
                    <code>{{scope_everything}}</code>
                    <code>{{scope_post_types}}</code>
                    <code>{{scope_stories}}</code>
                    <code>{{scope_categories}}</code>
                    <code>{{scope_tags}}</code>
                    <code>{{scope_fandoms}}</code>
                    <code>{{scope_characters}}</code>
                    <code>{{scope_warnings}}</code>
                  </p>
                  <details class="fcnen-default-code">
                    <summary><?php _e( 'Default HTML', 'fcnen' ); ?></summary>
                    <pre>
                      <code><?php echo esc_textarea( $defaults['fcnen_template_layout_edit'] ?? '' ); ?></code>
                    </pre>
                  </details>
                  <div class="fcnen-action-wrap">
                    <?php submit_button( __( 'Save Templates', 'fcnen' ), 'primary', 'submit', false ); ?>
                  </div>
                </div>
                <div class="fcnen-box__row fcnen-box__vertical fcnen-template-wrapper hidden" id="layout-notification">
                  <p class="fcnen-replacement-tokens"><?php _e( 'This email is sent for actual update notifications and consists of multiple parts: layout and loop partials. While this layout provides the surrounding body with some nice text of your choice (and the code, really important), the loop partials render the individual content matching the subscriber’s preferences.', 'fcnen' ); ?></p>
                  <div class="fcnen-left-right-wrap">
                    <label for="fcnen-template-subject-notification" class="offset-top"><?php _e( 'Subject', 'fcnen' ); ?></label>
                    <div class="fcnen-input-wrap">
                      <input type="text" name="fcnen_template_subject_notification" id="fcnen-template-subject-notification" placeholder="<?php echo $defaults['fcnen_template_subject_notification']; ?>" value="<?php echo $subject_notification; ?>">
                    </div>
                  </div>
                  <textarea name="fcnen_template_layout_notification" id="fcnen-template-layout-notification" class="fcnen-codemirror"><?php echo esc_textarea( $layout_notification ); ?></textarea>
                  <p class="fcnen-replacement-tokens">
                    <code>{{site_name}}</code>
                    <code>{{site_link}}</code>
                    <code>{{unsubscribe_link}}</code>
                    <code>{{edit_link}}</code>
                    <code>{{email}}</code>
                    <code>{{code}}</code>
                    <code>{{id}}</code>
                    <code>{{updates}}</code>
                  </p>
                  <details class="fcnen-default-code">
                    <summary><?php _e( 'Default HTML', 'fcnen' ); ?></summary>
                    <pre>
                      <code><?php echo esc_textarea( $defaults['fcnen_template_layout_notification'] ?? '' ); ?></code>
                    </pre>
                  </details>
                  <div class="fcnen-action-wrap">
                    <?php submit_button( __( 'Save Templates', 'fcnen' ), 'primary', 'submit', false ); ?>
                  </div>
                </div>
                <div class="fcnen-box__row fcnen-box__vertical fcnen-template-wrapper hidden" id="loop-part-post">
                  <p class="fcnen-replacement-tokens"><?php _e( 'This partial renders post updates in notification emails inside the <code>{{updates}}</code> replacement token.', 'fcnen' ); ?></p>
                  <textarea name="fcnen_template_loop_part_post" id="fcnen-template-loop-part-post" class="fcnen-codemirror"><?php echo esc_textarea( $loop_part_post ); ?></textarea>
                  <p class="fcnen-replacement-tokens">
                    <code>{{type}}</code>
                    <code>{{title}}</code>
                    <code>{{link}}</code>
                    <code>{{author}}</code>
                    <code>{{author_link}}</code>
                    <code>{{excerpt}}</code>
                    <code>{{date}}</code>
                    <code>{{time}}</code>
                    <code>{{thumbnail}}</code>
                    <code>{{categories}}</code>
                    <code>{{tags}}</code>
                    <code>{{site_name}}</code>
                    <code>{{site_link}}</code>
                  </p>
                  <details class="fcnen-default-code">
                    <summary><?php _e( 'Default HTML', 'fcnen' ); ?></summary>
                    <pre>
                      <code><?php echo esc_textarea( $defaults['fcnen_template_loop_part_post'] ?? '' ); ?></code>
                    </pre>
                  </details>
                  <div class="fcnen-action-wrap">
                    <?php submit_button( __( 'Save Templates', 'fcnen' ), 'primary', 'submit', false ); ?>
                  </div>
                </div>
                <div class="fcnen-box__row fcnen-box__vertical fcnen-template-wrapper hidden" id="loop-part-story">
                  <p class="fcnen-replacement-tokens"><?php _e( 'This partial renders story updates in notification emails inside the <code>{{updates}}</code> replacement token.', 'fcnen' ); ?></p>
                  <textarea name="fcnen_template_loop_part_story" id="fcnen-template-loop-part-story" class="fcnen-codemirror"><?php echo esc_textarea( $loop_part_story ); ?></textarea>
                  <p class="fcnen-replacement-tokens">
                    <code>{{type}}</code>
                    <code>{{title}}</code>
                    <code>{{link}}</code>
                    <code>{{author}}</code>
                    <code>{{author_link}}</code>
                    <code>{{excerpt}}</code>
                    <code>{{date}}</code>
                    <code>{{time}}</code>
                    <code>{{thumbnail}}</code>
                    <code>{{categories}}</code>
                    <code>{{tags}}</code>
                    <code>{{genres}}</code>
                    <code>{{fandoms}}</code>
                    <code>{{characters}}</code>
                    <code>{{warnings}}</code>
                    <code>{{all_terms}}</code>
                    <code>{{site_name}}</code>
                    <code>{{site_link}}</code>
                  </p>
                  <details class="fcnen-default-code">
                    <summary><?php _e( 'Default HTML', 'fcnen' ); ?></summary>
                    <pre>
                      <code><?php echo esc_textarea( $defaults['fcnen_template_loop_part_story'] ?? '' ); ?></code>
                    </pre>
                  </details>
                  <div class="fcnen-action-wrap">
                    <?php submit_button( __( 'Save Templates', 'fcnen' ), 'primary', 'submit', false ); ?>
                  </div>
                </div>
                <div class="fcnen-box__row fcnen-box__vertical fcnen-template-wrapper hidden" id="loop-part-chapter">
                  <p class="fcnen-replacement-tokens"><?php _e( 'This partial renders chapter updates in notification emails inside the <code>{{updates}}</code> replacement token.', 'fcnen' ); ?></p>
                  <textarea name="fcnen_template_loop_part_chapter" id="fcnen-template-loop-part-chapter" class="fcnen-codemirror"><?php echo esc_textarea( $loop_part_chapter ); ?></textarea>
                  <p class="fcnen-replacement-tokens">
                    <code>{{type}}</code>
                    <code>{{title}}</code>
                    <code>{{link}}</code>
                    <code>{{author}}</code>
                    <code>{{author_link}}</code>
                    <code>{{excerpt}}</code>
                    <code>{{date}}</code>
                    <code>{{time}}</code>
                    <code>{{thumbnail}}</code>
                    <code>{{categories}}</code>
                    <code>{{tags}}</code>
                    <code>{{genres}}</code>
                    <code>{{fandoms}}</code>
                    <code>{{characters}}</code>
                    <code>{{warnings}}</code>
                    <code>{{all_terms}}</code>
                    <code>{{story_title}}</code>
                    <code>{{story_link}}</code>
                    <code>{{site_name}}</code>
                    <code>{{site_link}}</code>
                  </p>
                  <details class="fcnen-default-code">
                    <summary><?php _e( 'Default HTML', 'fcnen' ); ?></summary>
                    <pre>
                      <code><?php echo esc_textarea( $defaults['fcnen_template_loop_part_chapter'] ?? '' ); ?></code>
                    </pre>
                  </details>
                  <div class="fcnen-action-wrap">
                    <?php submit_button( __( 'Save Templates', 'fcnen' ), 'primary', 'submit', false ); ?>
                  </div>
                </div>
              </td>
            </tr>
            <tr>
              <td class="td-full fcnen-template-preview-wrapper hidden" id="fcnen-preview">
                <h2 class="title"><?php _e( 'Preview', 'fcnen' ); ?></h2>
                <div>
                  <iframe id="fcnen-preview-iframe"></iframe>
                </div>
              </td>
            </tr>
          </tbody>
        </table>
      </form>
    </div>
  </div>
  <?php // <--- End HTML
}

// =======================================================================================
// ADMIN SETTINGS PAGE
// =======================================================================================

/**
 * Add settings admin submenu page
 *
 * @since 0.1.0
 */

function fcnen_add_settings_menu_page() {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    return;
  }

  // Add admin page
  add_submenu_page(
    'fcnen-notifications',
    'Settings',
    'Settings',
    'manage_options',
    'fcnen-settings',
    'fcnen_settings_page'
  );
}
add_action( 'admin_menu', 'fcnen_add_settings_menu_page' );

/**
 * Callback for the settings submenu page
 *
 * @since 0.1.0
 */

function fcnen_settings_page() {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    wp_die( __( 'You do not have permission to access this page.', 'fcnen' ) );
  }

  // Setup
  $from = fcnen_get_from_email_address();
  $name = fcnen_get_from_email_name();
  $excerpt_length = absint( get_option( 'fcnen_excerpt_length', 256 ) );
  $max_per_term = absint( get_option( 'fcnen_max_per_term', 10 ) );
  $excluded_posts = implode( ', ', get_option( 'fcnen_excluded_posts', [] ) ?: [] );
  $excluded_authors = implode( ', ', get_option( 'fcnen_excluded_authors', [] ) ?: [] );
  $excluded_emails = implode( "\n", get_option( 'fcnen_excluded_emails', [] ) ?: [] );
  $api_key = get_option( 'fcnen_api_key' );
  $api_bulk_limit = get_option( 'fcnen_api_bulk_limit', 300 );

  // Start HTML ---> ?>
  <div id="fcnen-admin-page-settings" class="wrap fcnen-settings _settings">
    <h1 class="wp-heading-inline"><?php _e( 'Settings', 'fcnen' ); ?></h1>
    <hr class="wp-header-end">
    <div class="fcnen-settings__content">
      <form method="post" action="options.php" novalidate="novalidate">
        <?php
          settings_fields( 'fcnen_general_group' );
          do_settings_sections( 'fcnen_general_group' );
        ?>
        <table class="form-table" role="presentation">
          <tbody>
            <tr>
              <th scope="row">
                <label for="fcnen-from-email-address"><?php _e( 'Sender Email', 'fcnen' ); ?></label>
              </th>
              <td>
                <input type="email" name="fcnen_from_email_address" id="fcnen-from-email-address" class="regular-text ltr" placeholder="<?php _ex( 'noreply@your-site.com', 'From email address placeholder.', 'fcnen' ); ?>" value="<?php echo esc_attr( $from ); ?>" autocomplete="off" spellcheck="false" autocorrect="off" data-1p-ignore>
                <p class="description"><?php _e( 'Defaults to noreply@* or admin email address.', 'fcnen' ); ?></p>
              </td>
            </tr>
            <tr>
              <th scope="row">
                <label for="fcnen-from-email-name"><?php _e( 'Sender Name', 'fcnen' ); ?></label>
              </th>
              <td>
                <input type="text" name="fcnen_from_email_name" id="fcnen-from-email-name" class="regular-text" placeholder="<?php _ex( 'Your Site', 'From email name placeholder.', 'fcnen' ); ?>" value="<?php echo esc_attr( $name ); ?>" autocomplete="off" spellcheck="false" autocorrect="off" data-1p-ignore>
                <p class="description"><?php _e( 'Defaults to site name.', 'fcnen' ); ?></p>
              </td>
            </tr>
            <tr>
              <th scope="row"><?php _e( 'Options', 'fcnen' ); ?></th>
              <td>
                <fieldset>
                  <label for="fcnen-flag-stories">
                    <input type="hidden" name="fcnen_flag_subscribe_to_stories" value="0">
                    <input type="checkbox" name="fcnen_flag_subscribe_to_stories" id="fcnen-flag-stories" value="1" autocomplete="off" <?php echo checked( 1, get_option( 'fcnen_flag_subscribe_to_stories' ), false ); ?>>
                    <?php _e( 'Allow subscriptions to stories', 'fcnen' ); ?>
                  </label>
                  <br>
                  <label for="fcnen-flag-taxonomies">
                    <input type="hidden" name="fcnen_flag_subscribe_to_taxonomies" value="0">
                    <input type="checkbox" name="fcnen_flag_subscribe_to_taxonomies" id="fcnen-flag-taxonomies" value="1" autocomplete="off" <?php echo checked( 1, get_option( 'fcnen_flag_subscribe_to_taxonomies' ), false ); ?>>
                    <?php _e( 'Allow subscriptions to taxonomies', 'fcnen' ); ?>
                  </label>
                  <br>
                  <label for="fcnen-flag-allow-passwords">
                    <input type="hidden" name="fcnen_flag_allow_passwords" value="0">
                    <input type="checkbox" name="fcnen_flag_allow_passwords" id="fcnen-flag-allow-passwords" value="1" autocomplete="off" <?php echo checked( 1, get_option( 'fcnen_flag_allow_passwords' ), false ); ?>>
                    <?php _e( 'Unblock notifications for protected posts', 'fcnen' ); ?>
                  </label>
                  <br>
                  <label for="fcnen-flag-allow-hidden">
                    <input type="hidden" name="fcnen_flag_allow_hidden" value="0">
                    <input type="checkbox" name="fcnen_flag_allow_hidden" id="fcnen-flag-allow-hidden" value="1" autocomplete="off" <?php echo checked( 1, get_option( 'fcnen_flag_allow_hidden' ), false ); ?>>
                    <?php _e( 'Unblock notifications for hidden posts', 'fcnen' ); ?>
                  </label>
                  <br>
                  <label for="fcnen-flag-disabled-blocked-enqueue">
                    <input type="hidden" name="fcnen_flag_disable_blocked_enqueue" value="0">
                    <input type="checkbox" name="fcnen_flag_disable_blocked_enqueue" id="fcnen-flag-disabled-blocked-enqueue" value="1" autocomplete="off" <?php echo checked( 1, get_option( 'fcnen_flag_disable_blocked_enqueue' ), false ); ?>>
                    <?php _e( 'Do not enqueue blocked posts upon publishing', 'fcnen' ); ?>
                  </label>
                </fieldset>
              </td>
            </tr>
            <tr>
              <th scope="row">
                <label for="fcnen-excerpt-length"><?php _e( 'Excerpts', 'fcnen' ); ?></label>
              </th>
              <td>
                <input type="number" name="fcnen_excerpt_length" id="fcnen-excerpt-length" class="small-text" placeholder="256" value="<?php echo esc_attr( $excerpt_length ); ?>" autocomplete="off" spellcheck="false" autocorrect="off" data-1p-ignore>
                <p class="description"><?php _e( 'Maximum characters for generated excerpts. Custom excerpts are not limited.', 'fcnen' ); ?></p>
              </td>
            </tr>
            <tr>
              <th scope="row">
                <label for="fcnen-max-per-term"><?php _e( 'Maximums', 'fcnen' ); ?></label>
              </th>
              <td>
                <input type="number" name="fcnen_max_per_term" id="fcnen-max-per-term" class="small-text" placeholder="10" value="<?php echo esc_attr( $max_per_term ); ?>" autocomplete="off" spellcheck="false" autocorrect="off" data-1p-ignore>
                <p class="description"><?php _e( 'Maximum subscription items per category, tag, and taxonomies. Disable with 0.', 'fcnen' ); ?></p>
              </td>
            </tr>
            <tr>
              <th scope="row">
                <label for="fcnen-excluded-posts"><?php _e( 'Excluded Posts', 'fcnen' ); ?></label>
              </th>
              <td>
                <fieldset>
                  <p><label for="fcnen-excluded-posts"><?php _e( 'Comma-separated list of excluded post IDs.', 'fcnen' ); ?></label></p>
                  <p><textarea name="fcnen_excluded_posts" id="fcnen-excluded-posts" class="code" cols="50" rows="5" autocomplete="off" spellcheck="false" autocorrect="off"><?php echo $excluded_posts; ?></textarea></p>
                </fieldset>
              </td>
            </tr>
            <tr>
              <th scope="row">
                <label for="fcnen-excluded-authors"><?php _e( 'Excluded Authors', 'fcnen' ); ?></label>
              </th>
              <td>
                <fieldset>
                  <p><label for="fcnen-excluded-authors"><?php _e( 'Comma-separated list of excluded author IDs.', 'fcnen' ); ?></label></p>
                  <p><textarea name="fcnen_excluded_authors" id="fcnen-excluded-authors" class="code" cols="50" rows="5" autocomplete="off" spellcheck="false" autocorrect="off"><?php echo $excluded_authors; ?></textarea></p>
                </fieldset>
              </td>
            </tr>
            <tr>
              <th scope="row">
                <label for="fcnen-excluded-emails"><?php _e( 'Excluded Emails', 'fcnen' ); ?></label>
              </th>
              <td>
                <fieldset>
                  <p><label for="fcnen-excluded-emails"><?php _e( 'List of excluded email addresses, one per line.', 'fcnen' ); ?></label></p>
                  <p><textarea name="fcnen_excluded_emails" id="fcnen-excluded-emails" class="code" cols="50" rows="5" autocomplete="off" spellcheck="false" autocorrect="off"><?php echo $excluded_emails; ?></textarea></p>
                </fieldset>
              </td>
            </tr>
            <tr>
              <th scope="row">
                <label for="fcnen-flag-purge-on-deactivation"><?php _e( 'Deactivation', 'fcnen' ); ?></label>
              </th>
              <td>
                <label for="fcnen-flag-purge-on-deactivation">
                  <input type="hidden" name="fcnen_flag_purge_on_deactivation" value="0">
                  <input type="checkbox" name="fcnen_flag_purge_on_deactivation" id="fcnen-flag-purge-on-deactivation" value="1" autocomplete="off" <?php echo checked( 1, get_option( 'fcnen_flag_purge_on_deactivation' ), false ); ?>>
                  <?php _e( 'Delete all plugin data on deactivation (irreversible)', 'fcnen' ); ?>
                </label>
              </td>
            </tr>
          </tbody>
        </table>
        <h2 class="title"><?php _e( 'MailerSend', 'fcnen' ); ?></h2>
        <p><?php _e( 'The plugin composes the email bodies and pushes them in batches to the service, which in turn sends the emails.', 'fcnen' ); ?></p>
        <table class="form-table" role="presentation">
          <tbody>
            <tr>
              <th scope="row">
                <label for="fcnen-api-key"><?php _e( 'API Key', 'fcnen' ); ?></label>
              </th>
              <td>
                <input type="text" name="fcnen_api_key" id="fcnen-api-key" class="regular-text" value="<?php echo esc_attr( $api_key ); ?>" autocomplete="off" spellcheck="false" autocorrect="off" data-1p-ignore>
                <p class="description"><?php
                  printf(
                    __( 'You can get that from your <a href="%s" target="_blank">MailerSend</a> account.', 'fcnen' ),
                    'https://www.mailersend.com/'
                  );
                ?></p>
              </td>
            </tr>
            <tr>
              <th scope="row">
                <label for="fcnen-api-bulk-limit"><?php _e( 'Batch Limit', 'fcnen' ); ?></label>
              </th>
              <td>
                <input type="number" name="fcnen_api_bulk_limit" id="fcnen-api-bulk-limit" class="small-text" value="<?php echo esc_attr( $api_bulk_limit ); ?>" autocomplete="off" spellcheck="false" autocorrect="off" data-1p-ignore>
                <p class="description"><?php _e( 'Emails per request (max. 500).', 'fcnen' ); ?></p>
              </td>
            </tr>
          </tbody>
        </table>
        <p class="submit"><?php
          submit_button( __( 'Save Changes', 'fcnen' ), 'primary', 'submit', false );

          echo '<a href="' . wp_nonce_url( admin_url( 'admin-post.php?action=fcnen_check_mailersend_api_quota' ), 'fcnen-mailersend-api-quota', 'fcnen-nonce' ) . '" class="button" rel="noopener" ' . ( $api_key ? '' : 'disabled' ) . '>' . __( 'Check Quota', 'fcnen' ) . '</a>';
        ?></p>
      </form>
    </div>
  </div>
  <?php // <--- End HTML
}

// =======================================================================================
// ADMIN LOG PAGE
// =======================================================================================

/**
 * Add log admin submenu page
 *
 * @since 0.1.0
 */

function fcnen_add_log_menu_page() {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    return;
  }

  // Add admin page
  $fcnen_admin_page_logs = add_submenu_page(
    'fcnen-notifications',
    'Log',
    'Log',
    'manage_options',
    'fcnen-log',
    'fcnen_log_page'
  );
}
add_action( 'admin_menu', 'fcnen_add_log_menu_page' );

/**
 * Callback for the log submenu page
 *
 * @since 0.1.0
 */

function fcnen_log_page() {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    wp_die( __( 'You do not have permission to access this page.', 'fcnen' ) );
  }

  // Start HTML ---> ?>
  <div id="fcnen-admin-page-log" class="wrap fcnen-settings _log">
    <h1 class="wp-heading-inline"><?php _e( 'Log', 'fcnen' ); ?></h1>
    <hr class="wp-header-end">
    <p><?php
      printf(
        __( 'These are the most recent 200 log items. Up to %s items are saved in the actual log file in the wp-content directory. Note that due to privacy concerns, only administrative and system actions are logged and only with IDs instead of email addresses. Datetime in YYYY-MM-DD HH:MM:SS (GMT/UTC).', 'fcnen' ),
        FCNEN_LOG_LIMIT
      );
    ?></p>
    <form method="get" action="<?php echo admin_url( 'admin-post.php' ); ?>" class="fcnen-log-bulk-status-form">
      <?php wp_nonce_field( 'fcnen-mailersend-bulk-status', 'fcnen-nonce', false ); ?>
      <input type="hidden" name="action" value="fcnen_check_mailersend_bulk_status">
      <input type="text" name="id" autocomplete="off" autocorrect="off" spellcheck="false" placeholder="<?php esc_attr_e( 'Bulk Email ID', 'fcnen' ); ?>">
      <button type="submit" class="button button-primary"><?php _e( 'Check', 'fcnen' ); ?></button>
    </form>
    <div class="fcnen-log-wrapper" id="fcnen-log">
      <?php echo fcnen_get_log(); ?>
    </div>
  </div>
  <?php // <--- End HTML
}

// =======================================================================================
// POST META
// =======================================================================================

/**
 * Register metabox
 *
 * @since 0.1.0
 */

function fcnen_register_metabox() {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    return;
  }

  add_meta_box(
    'fcnen-email-notifications',
    __( 'Email Notifications', 'fcnen' ),
    'fcnen_render_metabox',
    ['post', 'fcn_story', 'fcn_chapter'],
    'side',
    'high'
  );
}
add_action( 'add_meta_boxes', 'fcnen_register_metabox' );

/**
 * Add classes to metabox
 *
 * @since 0.1.0
 *
 * @param array $classes  An array of postbox classes.
 *
 * @return array The modified array of postbox classes.
 */

function fcnen_add_metabox_classes( $classes ) {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    return;
  }

  // Add class
  $classes[] = 'fcnen-metabox';

  // Return with added class
  return $classes;
}
add_filter( 'postbox_classes_post_fcnen-email-notifications', 'fcnen_add_metabox_classes' );
add_filter( 'postbox_classes_fcn_story_fcnen-email-notifications', 'fcnen_add_metabox_classes' );
add_filter( 'postbox_classes_fcn_chapter_fcnen-email-notifications', 'fcnen_add_metabox_classes' );

/**
 * Render the metabox
 *
 * @since 0.1.0
 *
 * @param WP_Post $post  The current post object.
 */

function fcnen_render_metabox( $post ) {
  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    return;
  }

  // Setup
  $nonce = wp_create_nonce( 'fcnen-metabox-nonce' );
  $meta = fcnen_get_meta( $post->ID );
  $excluded = $meta['excluded'] ?? 0;
  $dates = [];
  $notification = fcnen_get_notification( $post->ID );
  $added_at = null;

  if ( $meta['sent'] ?? 0 ) {
    foreach ( $meta['sent'] as $date ) {
      $dates[] = get_date_from_gmt(
        $date,
        sprintf(
          _x( '%1$s \a\t %2$s', 'Time format string.', 'fcnen' ),
          get_option( 'date_format' ),
          get_option( 'time_format' )
        )
      );
    }

    $dates = array_reverse( $dates );
  }

  if ( $notification ) {
    $added_at = get_date_from_gmt(
      $notification->added_at,
      sprintf(
        _x( '%1$s \a\t %2$s', 'Time format string.', 'fcnen' ),
        get_option( 'date_format' ),
        get_option( 'time_format' )
      )
    );
  }

  // Start HTML ---> ?>
  <input type="hidden" name="fcnen-nonce" value="<?php echo esc_attr( $nonce ); ?>" autocomplete="off">
  <?php if ( ! empty( $dates ) ) : ?>
    <div class="fcnen-metabox-date-info">
      <p><strong><?php _e( 'Mailed on', 'fcnen' ); ?></strong></p>
      <div class="fcnen-metabox-date-info__dates"><?php echo implode( '<br>', $dates ); ?></div>
    </div>
  <?php endif; ?>
  <?php if ( $added_at ) : ?>
    <p class="fcnen-metabox-date-info"><?php
      if ( empty( $dates ) ) {
        printf( __( '<strong>Enqueued on</strong>%s', 'fcnen' ), $added_at );
      } else {
        printf( __( '<strong>Enqueued again on</strong>%s', 'fcnen' ), $added_at );
      }
    ?></p>
  <?php endif; ?>
  <label class="fictioneer-meta-checkbox">
    <div class="fictioneer-meta-checkbox__checkbox">
      <input type="checkbox" id="fcnen-enqueue-on-update" name="fcnen_enqueue_on_update" value="1" autocomplete="off">
      <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24" focusable="false"><path d="M16.7 7.1l-6.3 8.5-3.3-2.5-.9 1.2 4.5 3.4L17.9 8z"></path></svg>
    </div>
    <div class="fictioneer-meta-checkbox__label"><?php _e( 'Enqueue again on update', 'fcnen' ); ?></div>
  </label>
  <label class="fictioneer-meta-checkbox">
    <div class="fictioneer-meta-checkbox__checkbox">
      <input type="checkbox" id="fcnen-exclude-from-notifications" name="fcnen_exclude_from_notifications" value="1" autocomplete="off" <?php checked( $excluded, 1 ); ?>>
      <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24" focusable="false"><path d="M16.7 7.1l-6.3 8.5-3.3-2.5-.9 1.2 4.5 3.4L17.9 8z"></path></svg>
    </div>
    <div class="fictioneer-meta-checkbox__label"><?php _e( 'Exclude from notifications', 'fcnen' ); ?></div>
  </label>
  <?php // <--- End HTML
}

/**
 * Save the metabox data
 *
 * @since 0.1.0
 *
 * @param int $post_id  The ID of the post being saved.
 */

function fcnen_save_metabox( $post_id ) {
  // Verify request
  if ( ! wp_verify_nonce( $_POST['fcnen-nonce'] ?? '', 'fcnen-metabox-nonce' ) ) {
    return;
  }

  // Guard
  if ( ! current_user_can( 'manage_options' ) ) {
    return;
  }

  // Setup
  $meta = fcnen_get_meta( $post_id );

  // Exclude from queue
  if ( isset( $_POST['fcnen_exclude_from_notifications'] ) ) {
    $meta['excluded'] = 1;
  } else {
    $meta['excluded'] = 0;
  }

  // Prepare sent dates if not set
  if ( empty( $meta['sent'] ?? 0 ) ) {
    $meta['sent'] = [];
  }

  // Save
  fcnen_set_meta( $post_id, $meta );
}
add_action( 'save_post_post', 'fcnen_save_metabox', 5 );
add_action( 'save_post_fcn_story', 'fcnen_save_metabox', 5 );
add_action( 'save_post_fcn_chapter', 'fcnen_save_metabox', 5 );

// =======================================================================================
// ADMIN PROFILE
// =======================================================================================

/**
 * Renders HTML for the subscription section in the wp-admin user profile
 *
 * @since 0.1.0
 *
 * @param WP_User $profile_user  The profile user object. Not necessarily the one
 *                               currently editing the profile!
 */

function fcnen_admin_account_profile_section( $profile_user ) {
  // Only for own profile
  if ( get_current_user_id() !== $profile_user->ID ) {
    return;
  }

  // Setup
  $email = get_user_meta( $profile_user->ID, 'fcnen_subscription_email', true ) ?: '';
  $code = get_user_meta( $profile_user->ID, 'fcnen_subscription_code', true ) ?: '';
  $subscriber = null;
  $link_status = null;

  // Subscription?
  if ( $email && $code ) {
    $subscriber = fcnen_get_subscriber_by_email_and_code( $email, $code );
  }

  // Linked?
  if ( $subscriber === false ) {
    $link_status = 'mismatch';
  } elseif ( ! empty( $subscriber ) ) {
    $link_status = 'linked';
  }

  // --- Start HTML ---> ?>
  <tr class="user-fcnen-subscription-wrap">
    <th><?php _e( 'Email Subscription', 'fcnen' ); ?></th>
    <td>
      <fieldset>

        <p>
          <?php _e( 'Your email subscription for selected content updates is kept separate from your account, meaning you can use a different email address. But you also need to authenticate with your code every time you wish to view or update your subscription. For convenience, you can link your subscription here.', 'fcnen' ); ?>
        </p>

        <br>

        <?php
          if ( $link_status === 'mismatch' ) {
            echo '<p><strong>' . __( 'No matching subscription found. Please check your email address and code.', 'fcnen' ) . '</strong></p><br>';
          } elseif ( $link_status === 'linked' ) {
            echo '<p><strong>' . __( 'Subscription successfully linked.', 'fcnen' ) . '</strong></p><br>';
          }
        ?>

        <input name="fcnen_subscription_email" type="email" id="fcnen_subscription_email" value="<?php echo $email; ?>" class="regular-text">
        <p class="description"><?php _e( 'Email address used for your subscription.', 'fcnen' ); ?></p>

        <br>

        <input name="fcnen_subscription_code" type="password" id="fcnen_subscription_code" value="<?php echo $code; ?>" class="regular-text">
        <p class="description"><?php _e( 'Found in notification emails. If compromised, delete and renew subscription.', 'fcnen' ); ?></p>

        <?php if ( get_option( 'fictioneer_enable_follows' ) ) : ?>

          <br>

          <div>
            <label for="fcnen_enable_subscribe_by_follow" class="checkbox-group">
              <input type="hidden" name="fcnen_enable_subscribe_by_follow" value="0">
              <input name="fcnen_enable_subscribe_by_follow" type="checkbox" id="fcnen_enable_subscribe_by_follow" <?php echo checked( 1, get_the_author_meta( 'fcnen_enable_subscribe_by_follow', $profile_user->ID ), false ); ?> value="1">
              <span><?php _e( 'Subscribe to Stories by Following (not retroactive)', 'fcnen' ); ?></span>
            </label>
          </div>

        <?php endif; ?>

      </fieldset>
    </td>
  </tr>
  <?php // <--- End HTML
}
add_action( 'fictioneer_admin_user_sections', 'fcnen_admin_account_profile_section', 9 );

/**
 * Update subscription section of the wp-admin user profile
 *
 * @since 0.1.0
 *
 * @param int $updated_user_id  The ID of the updated user.
 */

function fcnen_update_admin_user_profile( $updated_user_id ) {
  // Guard
  if ( get_current_user_id() !== $updated_user_id || ! check_admin_referer( 'update-user_' . $updated_user_id ) ) {
    return;
  }

  // Subscriber email
  if ( isset( $_POST['fcnen_subscription_email'] ) ) {
    fictioneer_update_user_meta(
      $updated_user_id,
      'fcnen_subscription_email',
      sanitize_email( $_POST['fcnen_subscription_email'] ?? '' )
    );
  }

  // Subscriber code
  if ( isset( $_POST['fcnen_subscription_code'] ) ) {
    fictioneer_update_user_meta(
      $updated_user_id,
      'fcnen_subscription_code',
      sanitize_text_field( $_POST['fcnen_subscription_code'] ?? '' )
    );
  }

  // Subscribe by Following
  if ( get_option( 'fictioneer_enable_follows' ) && isset( $_POST['fcnen_enable_subscribe_by_follow'] ) ) {
    fictioneer_update_user_meta(
      $updated_user_id,
      'fcnen_enable_subscribe_by_follow',
      fictioneer_sanitize_checkbox( $_POST['fcnen_enable_subscribe_by_follow'] ?? 0 )
    );
  }
}
add_action( 'personal_options_update', 'fcnen_update_admin_user_profile' );