<?php
/**
 * Post Meta module
 *
 * Version: 1.5.4
 */

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

if ( ! class_exists( 'Cherry_X_Post_Meta' ) ) {

	/**
	 * Post meta management module.
	 */
	class Cherry_X_Post_Meta {

		/**
		 * Module arguments.
		 *
		 * @var array
		 */
		public $args = array();

		/**
		 * Interface builder instance.
		 *
		 * @var object
		 */
		public $builder = null;

		/**
		 * Current nonce name to check.
		 *
		 * @var null
		 */
		public $nonce = 'cherry-x-meta-nonce';

		/**
		 * Storage of meta values.
		 *
		 * @since 1.0.0
		 * @var   array
		 */
		public $meta_values = array();

		/**
		 * Constructor for the module.
		 *
		 * @since 1.0.0
		 */
		public function __construct( $args = array() ) {

			$this->args = wp_parse_args(
				$args,
				array(
					'id'            => 'cherry-post-metabox',
					'title'         => '',
					'page'          => array( 'post' ),
					'context'       => 'normal',
					'priority'      => 'high',
					'single'        => false,
					'callback_args' => false,
					'builder_cb'    => false,
					'fields'        => array(),
				)
			);

			if ( empty( $this->args['fields'] ) ) {
				return;
			}

			if ( ! is_array( $this->args['page'] ) ) {
				$this->args['page'] = array( $this->args['page'] );
			}

			$this->init_columns_actions();

			add_action( 'admin_enqueue_scripts', array( $this, 'init_builder' ), 0 );
			add_action( 'add_meta_boxes', array( $this, 'add_meta_boxes' ), 10, 2 );
			add_action( 'save_post', array( $this, 'save_meta' ), 10, 2 );

			if ( in_array( 'attachment', $this->args['page'] ) ) {
				add_action( 'attachment_updated', array( $this, 'save_meta' ), 10, 2 );
			}

		}

		/**
		 * Initialize builder
		 *
		 * @return [type] [description]
		 */
		public function init_builder( $hook ) {
			global $post;

			if ( ! in_array( $hook, array( 'post-new.php', 'post.php' ) ) ) {
				return;
			}

			$post_type = get_post_type();

			if ( ! in_array( $post_type, $this->args['page'] ) ) {
				return;
			}

			if ( ! isset( $this->args['builder_cb'] ) || ! is_callable( $this->args['builder_cb'] ) ) {
				return;
			}

			$this->builder = call_user_func( $this->args['builder_cb'] );

			$this->get_fields( $post );

		}

		/**
		 * Initalize admin columns
		 *
		 * @return void
		 */
		public function init_columns_actions() {

			if ( empty( $this->args['admin_columns'] ) ) {
				return;
			}

			if ( ! is_array( $this->args['page'] ) ) {
				$pages = array( $this->args['page'] );
			} else {
				$pages = $this->args['page'];
			}

			foreach ( $pages as $page ) {
				add_filter( 'manage_edit-' . $page . '_columns', array( $this, 'edit_columns' ) );
				add_action( 'manage_' . $page . '_posts_custom_column', array( $this, 'manage_columns' ), 10, 2 );
			}

		}

		/**
		 * Edit admin columns
		 *
		 * @since  1.1.3
		 * @param  array $columns current post table columns.
		 * @return array
		 */
		public function edit_columns( $columns ) {

			foreach ( $this->args['admin_columns'] as $column_key => $column_data ) {

				if ( empty( $column_data['label'] ) ) {
					continue;
				}

				if ( ! empty( $column_data['position'] ) && 0 !== (int) $column_data['position'] ) {

					$length = count( $columns );

					if ( (int) $column_data['position'] > $length ) {
						$columns[ $column_key ] = $column_data['label'];
					}

					$columns_before = array_slice( $columns, 0, (int) $column_data['position'] );
					$columns_after  = array_slice( $columns, (int) $column_data['position'], $length - (int) $column_data['position'] );

					$columns = array_merge(
						$columns_before,
						array(
							$column_key => $column_data['label'],
						),
						$columns_after
					);
				} else {
					$columns[ $column_key ] = $column_data['label'];
				}
			}

			return $columns;

		}

		/**
		 * Add output for custom columns.
		 *
		 * @since  1.1.3
		 * @param  string $column  current post list categories.
		 * @param  int    $post_id current post ID.
		 * @return void
		 */
		public function manage_columns( $column, $post_id ) {

			if ( empty( $this->args['admin_columns'][ $column ] ) ) {
				return;
			}

			if ( ! empty( $this->args['admin_columns'][ $column ]['callback'] ) && is_callable( $this->args['admin_columns'][ $column ]['callback'] ) ) {
				call_user_func( $this->args['admin_columns'][ $column ]['callback'], $column, $post_id );
			} else {
				echo get_post_meta( $post_id, $column, true );
			}

		}

		/**
		 * Check if defined metabox is allowed on current page
		 *
		 * @since  1.0.0
		 * @return boolean
		 */
		public function is_allowed_page() {

			global $current_screen;

			if ( empty( $current_screen ) ) {
				return false;
			}

			if ( is_array( $this->args['page'] ) && ! in_array( $current_screen->id, $this->args['page'] ) ) {
				return false;
			}

			if ( is_string( $this->args['page'] ) && $current_screen->id !== $this->args['page'] ) {
				return false;
			}

			return true;
		}

		/**
		 * Add meta box handler
		 *
		 * @since  1.0.0
		 * @param  [type] $post_type The post type of the current post being edited.
		 * @param  object $post      The current post object.
		 * @return void
		 */
		public function add_meta_boxes( $post_type, $post ) {

			if ( ! $this->is_allowed_page() ) {
				return;
			}

			add_meta_box(
				$this->args['id'],
				$this->args['title'],
				array( $this, 'render_metabox' ),
				$this->args['page'],
				$this->args['context'],
				$this->args['priority'],
				$this->args['callback_args']
			);
		}

		/**
		 * Render metabox funciton
		 *
		 * @since  1.0.0
		 * @param  object $post    The post object currently being edited.
		 * @param  array  $metabox Specific information about the meta box being loaded.
		 * @return void
		 */
		public function render_metabox( $post, $metabox ) {

			if ( ! $this->builder ) {
				return;
			}

			/**
			 * Filter custom metabox output. Prevent from showing main box, if user output passed
			 *
			 * @var string
			 */
			$custom_box = apply_filters( 'cx_post_meta/custom_box', false, $post, $metabox );

			if ( false !== $custom_box ) {
				echo $custom_box;
				return;
			}

			/**
			 * Hook fires before metabox output started.
			 */
			do_action( 'cx_post_meta/meta_box/before' );

			$this->builder->render();

			/**
			 * Hook fires after metabox output finished.
			 */
			do_action( 'cx_post_meta/meta_box/after' );

		}

		/**
		 * Safely get attribute from field settings array.
		 *
		 * @since  1.0.0
		 * @param  array            $field   arguments array.
		 * @param  string|int|float $arg     argument key.
		 * @param  mixed            $default default argument value.
		 * @return mixed
		 */
		public function get_arg( $field, $arg, $default = '' ) {
			if ( is_array( $field ) && isset( $field[ $arg ] ) ) {
				return $field[ $arg ];
			}
			return $default;
		}

		/**
		 * Get registered control fields
		 *
		 * @since  1.0.0
		 * @since  1.2.0 Use interface builder for HTML rendering.
		 * @param  mixed $post Current post object.
		 * @return void
		 */
		public function get_fields( $post ) {

			if ( is_array( $this->args['single'] ) && isset( $this->args['single']['key'] ) ) {
				$this->meta_values = get_post_meta( $post->ID, $this->args['single']['key'], true );
			}

			$zero_allowed = apply_filters(
				'cx_post_meta/zero_allowed_controls',
				array(
					//'stepper',
					'slider',
				)
			);

			foreach ( $this->args['fields'] as $key => $field ) {

				$default = $this->get_arg( $field, 'value', '' );
				$value   = $this->get_meta( $post, $key, $default, $field );

				if ( isset( $field['options_callback'] ) ) {
					$field['options'] = call_user_func( $field['options_callback'] );
				}

				$value = $this->prepare_field_value( $field, $value );