admin/settings/classes/metabox-options.class.php
<?php if ( ! defined( 'ABSPATH' ) ) { die; } // Cannot access directly.
/**
 *
 * Metabox Class
 *
 * @since 1.0.0
 * @version 1.0.0
 *
 */
if ( ! class_exists( 'ULF_Metabox' ) ) {
  class ULF_Metabox extends ULF_Abstract{

    // constans
    public $unique         = '';
    public $abstract       = 'metabox';
    public $sections       = array();
    public $pre_fields     = array();
    public $post_type      = array();
    public $args           = array(
      'title'              => '',
      'post_type'          => 'post',
      'data_type'          => 'serialize',
      'context'            => 'advanced',
      'priority'           => 'default',
      'exclude_post_types' => array(),
      'page_templates'     => '',
      'post_formats'       => '',
      'show_reset'         => false,
      'show_restore'       => false,
      'enqueue_webfont'    => true,
      'async_webfont'      => false,
      'output_css'         => true,
      'nav'                => 'normal',
      'theme'              => 'dark',
      'class'              => '',
      'defaults'           => array(),
    );

    // run metabox construct
    public function __construct( $key, $params = array() ) {

      $this->unique         = $key;
      $this->args           = apply_filters( "ulf_{$this->unique}_args", wp_parse_args( $params['args'], $this->args ), $this );
      $this->sections       = apply_filters( "ulf_{$this->unique}_sections", $params['sections'], $this );
      $this->post_type      = ( is_array( $this->args['post_type'] ) ) ? $this->args['post_type'] : array_filter( (array) $this->args['post_type'] );
      $this->post_formats   = ( is_array( $this->args['post_formats'] ) ) ? $this->args['post_formats'] : array_filter( (array) $this->args['post_formats'] );
      $this->page_templates = ( is_array( $this->args['page_templates'] ) ) ? $this->args['page_templates'] : array_filter( (array) $this->args['page_templates'] );
      $this->pre_fields     = $this->pre_fields( $this->sections );

      add_action( 'add_meta_boxes', array( $this, 'add_meta_box' ) );
      add_action( 'save_post', array( $this, 'save_meta_box' ) );
      add_action( 'edit_attachment', array( $this, 'save_meta_box' ) );

      if ( ! empty( $this->page_templates ) || ! empty( $this->post_formats ) || ! empty( $this->args['class'] ) ) {
        foreach ( $this->post_type as $post_type ) {
          add_filter( 'postbox_classes_'. $post_type .'_'. $this->unique, array( $this, 'add_metabox_classes' ) );
        }
      }

      // wp enqeueu for typography and output css
      parent::__construct();

    }

    // instance
    public static function instance( $key, $params = array() ) {
      return new self( $key, $params );
    }

    public function add_metabox_classes( $classes ) {

      global $post;

      if ( ! empty( $this->post_formats ) ) {

        $saved_post_format = ( is_object( $post ) ) ? get_post_format( $post ) : false;
        $saved_post_format = ( ! empty( $saved_post_format ) ) ? $saved_post_format : 'default';

        $classes[] = 'ulf-post-formats';

        // Sanitize post format for standard to default
        if ( ( $key = array_search( 'standard', $this->post_formats ) ) !== false ) {
          $this->post_formats[$key] = 'default';
        }

        foreach ( $this->post_formats as $format ) {
          $classes[] = 'ulf-post-format-'. $format;
        }

        if ( ! in_array( $saved_post_format, $this->post_formats ) ) {
          $classes[] = 'ulf-metabox-hide';
        } else {
          $classes[] = 'ulf-metabox-show';
        }

      }

      if ( ! empty( $this->page_templates ) ) {

        $saved_template = ( is_object( $post ) && ! empty( $post->page_template ) ) ? $post->page_template : 'default';

        $classes[] = 'ulf-page-templates';

        foreach ( $this->page_templates as $template ) {
          $classes[] = 'ulf-page-'. preg_replace( '/[^a-zA-Z0-9]+/', '-', strtolower( $template ) );
        }

        if ( ! in_array( $saved_template, $this->page_templates ) ) {
          $classes[] = 'ulf-metabox-hide';
        } else {
          $classes[] = 'ulf-metabox-show';
        }

      }

      if ( ! empty( $this->args['class'] ) ) {
        $classes[] = $this->args['class'];
      }

      return $classes;

    }

    // add metabox
    public function add_meta_box( $post_type ) {

      if ( ! in_array( $post_type, $this->args['exclude_post_types'] ) ) {
        add_meta_box( $this->unique, $this->args['title'], array( $this, 'add_meta_box_content' ), $this->post_type, $this->args['context'], $this->args['priority'], $this->args );
      }

    }

    // get default value
    public function get_default( $field ) {

      $default = ( isset( $field['default'] ) ) ? $field['default'] : '';
      $default = ( isset( $this->args['defaults'][$field['id']] ) ) ? $this->args['defaults'][$field['id']] : $default;

      return $default;

    }

    // get meta value
    public function get_meta_value( $field ) {

      global $post;

      $value = null;

      if ( is_object( $post ) && ! empty( $field['id'] ) ) {

        if ( $this->args['data_type'] !== 'serialize' ) {
          $meta  = get_post_meta( $post->ID, $field['id'] );
          $value = ( isset( $meta[0] ) ) ? $meta[0] : null;
        } else {
          $meta  = get_post_meta( $post->ID, $this->unique, true );
          $value = ( isset( $meta[$field['id']] ) ) ? $meta[$field['id']] : null;
        }

      }

      $default = ( isset( $field['id'] ) ) ? $this->get_default( $field ) : '';
      $value   = ( isset( $value ) ) ? $value : $default;

      return $value;

    }

    // add metabox content
    public function add_meta_box_content( $post, $callback ) {

      global $post;

      $has_nav   = ( count( $this->sections ) > 1 && $this->args['context'] !== 'side' ) ? true : false;
      $show_all  = ( ! $has_nav ) ? ' ulf-show-all' : '';
      $post_type = ( is_object ( $post ) ) ? $post->post_type : '';
      $errors    = ( is_object ( $post ) ) ? get_post_meta( $post->ID, '_ulf_errors_'. $this->unique, true ) : array();
      $errors    = ( ! empty( $errors ) ) ? $errors : array();
      $theme     = ( $this->args['theme'] ) ? ' ulf-theme-'. $this->args['theme'] : '';
      $nav_type  = ( $this->args['nav'] === 'inline' ) ? 'inline' : 'normal';

      if ( is_object ( $post ) && ! empty( $errors ) ) {
        delete_post_meta( $post->ID, '_ulf_errors_'. $this->unique );
      }

      wp_nonce_field( 'ulf_metabox_nonce', 'ulf_metabox_nonce'. $this->unique );

      echo '<div class="ulf ulf-metabox'. esc_attr( $theme ) .'">';

        echo '<div class="ulf-wrapper'. esc_attr( $show_all ) .'">';

          if ( $has_nav ) {

            echo '<div class="ulf-nav ulf-nav-'. esc_attr( $nav_type ) .' ulf-nav-metabox">';

              echo '<ul>';

              $tab_key = 0;

              foreach ( $this->sections as $section ) {

                if ( ! empty( $section['post_type'] ) && ! in_array( $post_type, array_filter( (array) $section['post_type'] ) ) ) {
                  continue;
                }

                $tab_error = ( ! empty( $errors['sections'][$tab_key] ) ) ? '<i class="ulf-label-error ulf-error">!</i>' : '';
                $tab_icon  = ( ! empty( $section['icon'] ) ) ? '<i class="ulf-tab-icon '. esc_attr( $section['icon'] ) .'"></i>' : '';

                echo '<li><a href="#">'. $tab_icon . $section['title'] . $tab_error .'</a></li>';

                $tab_key++;

              }

              echo '</ul>';

            echo '</div>';

          }

          echo '<div class="ulf-content">';

            echo '<div class="ulf-sections">';

            $section_key = 0;

            foreach ( $this->sections as $section ) {

              if ( ! empty( $section['post_type'] ) && ! in_array( $post_type, array_filter( (array) $section['post_type'] ) ) ) {
                continue;
              }

              $section_onload = ( ! $has_nav ) ? ' ulf-onload' : '';
              $section_class  = ( ! empty( $section['class'] ) ) ? ' '. $section['class'] : '';
              $section_title  = ( ! empty( $section['title'] ) ) ? $section['title'] : '';
              $section_icon   = ( ! empty( $section['icon'] ) ) ? '<i class="ulf-section-icon '. esc_attr( $section['icon'] ) .'"></i>' : '';

              echo '<div class="ulf-section hidden'. esc_attr( $section_onload . $section_class ) .'">';

              echo ( $section_title || $section_icon ) ? '<div class="ulf-section-title"><h3>'. $section_icon . $section_title .'</h3></div>' : '';
              echo ( ! empty( $section['description'] ) ) ? '<div class="ulf-field ulf-section-description">'. $section['description'] .'</div>' : '';

              if ( ! empty( $section['fields'] ) ) {

                foreach ( $section['fields'] as $field ) {

                  if ( ! empty( $field['id'] ) && ! empty( $errors['fields'][$field['id']] ) ) {
                    $field['_error'] = $errors['fields'][$field['id']];
                  }

                  if ( ! empty( $field['id'] ) ) {
                    $field['default'] = $this->get_default( $field );
                  }

                  ULF::field( $field, $this->get_meta_value( $field ), $this->unique, 'metabox' );

                }

              } else {

                echo '<div class="ulf-no-option">'. esc_html__( 'No data available.', 'ulf' ) .'</div>';

              }

              echo '</div>';

              $section_key++;

            }

            echo '</div>';

            if ( ! empty( $this->args['show_restore'] ) || ! empty( $this->args['show_reset'] ) ) {

              echo '<div class="ulf-sections-reset">';
              echo '<label>';
              echo '<input type="checkbox" name="'. esc_attr( $this->unique ) .'[_reset]" />';
              echo '<span class="button ulf-button-reset">'. esc_html__( 'Reset', 'ulf' ) .'</span>';
              echo '<span class="button ulf-button-cancel">'. sprintf( '<small>( %s )</small> %s', esc_html__( 'update post', 'ulf' ), esc_html__( 'Cancel', 'ulf' ) ) .'</span>';
              echo '</label>';
              echo '</div>';

            }

          echo '</div>';

          echo ( $has_nav && $nav_type === 'normal' ) ? '<div class="ulf-nav-background"></div>' : '';

          echo '<div class="clear"></div>';

        echo '</div>';

      echo '</div>';

    }

    // save metabox
    public function save_meta_box( $post_id ) {

      $count    = 1;
      $data     = array();
      $errors   = array();
      $noncekey = 'ulf_metabox_nonce'. $this->unique;
      $nonce    = ( ! empty( $_POST[ $noncekey ] ) ) ? sanitize_text_field( wp_unslash( $_POST[ $noncekey ] ) ) : '';

      if ( ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) || ! wp_verify_nonce( $nonce, 'ulf_metabox_nonce' ) ) {
        return $post_id;
      }

      // XSS ok.
      // No worries, This "POST" requests is sanitizing in the below foreach.
      $request = ( ! empty( $_POST[ $this->unique ] ) ) ? $_POST[ $this->unique ] : array();

      if ( ! empty( $request ) ) {

        foreach ( $this->sections as $section ) {

          if ( ! empty( $section['fields'] ) ) {

            foreach ( $section['fields'] as $field ) {

              if ( ! empty( $field['id'] ) ) {

                $field_id    = $field['id'];
                $field_value = isset( $request[$field_id] ) ? $request[$field_id] : '';

                // Sanitize "post" request of field.
                if ( ! isset( $field['sanitize'] ) ) {

                  if( is_array( $field_value ) ) {
                    $data[$field_id] = wp_kses_post_deep( $field_value );
                  } else {
                    $data[$field_id] = wp_kses_post( $field_value );
                  }

                } else if( isset( $field['sanitize'] ) && is_callable( $field['sanitize'] ) ) {

                  $data[$field_id] = call_user_func( $field['sanitize'], $field_value );

                } else {

                  $data[$field_id] = $field_value;

                }

                // Validate "post" request of field.
                if ( isset( $field['validate'] ) && is_callable( $field['validate'] ) ) {

                  $has_validated = call_user_func( $field['validate'], $field_value );

                  if ( ! empty( $has_validated ) ) {

                    $errors['sections'][$count] = true;
                    $errors['fields'][$field_id] = $has_validated;
                    $data[$field_id] = $this->get_meta_value( $field );

                  }

                }

              }

            }

          }

          $count++;

        }

      }

      $data = apply_filters( "ulf_{$this->unique}_save", $data, $post_id, $this );

      do_action( "ulf_{$this->unique}_save_before", $data, $post_id, $this );

      if ( empty( $data ) || ! empty( $request['_reset'] ) ) {

        if ( $this->args['data_type'] !== 'serialize' ) {
          foreach ( $this->pre_fields as $field ) {
            if ( ! empty( $field['id'] ) ) {
              delete_post_meta( $post_id, $field['id'] );
            }
          }
        } else {
          delete_post_meta( $post_id, $this->unique );
        }

      } else {

        if ( $this->args['data_type'] !== 'serialize' ) {
          foreach ( $data as $key => $value ) {
            update_post_meta( $post_id, $key, $value );
          }
        } else {
          update_post_meta( $post_id, $this->unique, $data );
        }

        if ( ! empty( $errors ) ) {
          update_post_meta( $post_id, '_ulf_errors_'. $this->unique, $errors );
        }

      }

      do_action( "ulf_{$this->unique}_saved", $data, $post_id, $this );

      do_action( "ulf_{$this->unique}_save_after", $data, $post_id, $this );

    }
  }
}
