<?php
/**
 * This file holds the class that creates the meta boxes for posts, pages and other custom post types
 *
 *
 * @author		Christian "Kriesi" Budschedl
 * @copyright	Copyright (c) Christian Budschedl
 * @link		http://kriesi.at
 * @link		http://aviathemes.com
 * @since		Version 1.0
 * @package 	AviaFramework
 */
if( ! defined( 'AVIA_FW' ) )  {  exit( 'No direct script access allowed' );  }

if( ! class_exists( 'avia_meta_box' ) )
{
	/**
	 *  The meta box class holds all methods necessary to create and sva and edit meta boxes for new posts, pages and custom post types
	 *
	 *  @package 	AviaFramework
	 */
	class avia_meta_box extends aviaFramework\base\object_properties
	{
		/**
		 *
		 * @since 5.3
		 * @var avia_superobject
		 */
		protected $superobject;

		/**
		 * Default boxes holds the information which meta boxes to create after the init_boxes method was called
		 *
		 * @var array
		 */
		protected $default_boxes;

		/**
		 * $box_elements holds the information which elements to add to each meta box
		 *
		 * @var array
		 */
		protected $box_elements;

		/**
		 * Object of class avia_htmlhelper, necessary to render the different elements
		 *
		 * @var avia_htmlhelper
		 */
		protected $html;

		/**
		 * A saftey check to prevent wordpress from calling the save function twice. it seems it gets applied once for each meta box which is not necessary here
		 *
		 * @var bool
		 */
		protected $saved;

		/**
		 * A check to prevent wordpress from adding the hidden data to each metabox, since its unneccesary
		 *
		 * @var bool
		 */
		protected $hidden_data_set;

		/**
		 * The theme name in escaped version so the options get only saved to the active theme
		 *
		 * @var string
		 */
		protected $meta_prefix;

		/**
		 * The constructor
		 * checks if we are currently viewing a post creation site and hooks into the admin_menu as well as into the save_post to create and safe the meta boxes
		 * It also creates the html object necessary to render the boxes
		 *
		 * @param avia_superobject $avia_superobject
		 */
		public function __construct( $avia_superobject )
		{
			$this->box_elements = array();
			$this->default_boxes = array();
			$this->html = null;
			$this->saved = false;
			$this->hidden_data_set = false;
			$this->meta_prefix = false;

			if( basename( $_SERVER['PHP_SELF'] ) == 'post-new.php'
			 || basename( $_SERVER['PHP_SELF']) == 'post.php' )
			{
				$this->superobject = $avia_superobject;
				$this->html = new avia_htmlhelper( $avia_superobject );
				$this->html->context = 'metabox';
				$this->meta_prefix = avia_backend_safe_string( $avia_superobject->base_data['prefix'] );

				add_action( 'admin_menu', array( $this, 'init_boxes' ) );
				add_action( 'save_post', array( $this, 'save_post' ) );
			}
		}

		/**
		 *
		 */
		public function __destruct()
		{
			unset( $this->superobject );
			unset( $this->box_elements );
			unset( $this->default_boxes );
			unset( $this->html );
		}

		/**
		 * Meta Box initialization
		 * This function checks if we already got metabox data stored in the posts meta table or if we need to get the data from the config file
		 * We then loop over the retrieved option array and create the according meta boxes, The callback for each metabox is set to create_meta_box
		 * which renders the elements within the box. To know which box we are currently rendering a callback argument is passed on initialization
		 */
		public function init_boxes()
		{
			if( isset( $_GET['post'] ) )
			{
				$postId = $_GET['post'];
			}
			else
			{
				$postId = '';
			}

			//load the options array
			include( AVIA_BASE . '/includes/admin/register-admin-metabox.php' );

			if( isset( $boxes ) && isset( $elements ) )
			{
				$this->default_boxes = apply_filters( 'avia_metabox_filter', $boxes );
				$this->box_elements  = apply_filters( 'avia_metabox_element_filter', $elements );

				//loop over the box array
				foreach( $this->default_boxes as $key => $box )
				{
					foreach( $box['page'] as $area )
					{
						$box['iteration'] = $key;
						add_meta_box(
							$box['id'], 							// HTML 'id' attribute of the edit screen section
							$box['title'],							// Title of the edit screen section, visible to user
							array( $this, 'create_meta_box' ),		// Function that prints out the HTML for the edit screen section.
							$area, 									// The type of Write screen on which to show the edit screen section ('post', 'page', etc)
							$box['context'], 						// The part were box is shown: ('normal', 'advanced', or 'side').
							$box['priority'],						// The priority within the context where the boxes should show ('high' or 'low')
							array('avia_current_box'=>$box) 	// callback arguments so we know which box we are in
						);
					}
				}
			}
		}

		/**
		 * Meta Box Creation
		 * This function iterates over the options array and creates the elments for each array entry
		 */
		public function create_meta_box( $currentPost, $metabox )
		{
			global $post;

			$output = '';
			$box = $metabox['args']['avia_current_box'];

			if( ! is_object( $post ) )
			{
				return;
			}

			$key = '_avia_elements_' . $this->superobject->option_prefix;

			if( current_theme_supports( 'avia_post_meta_compat' ) )
			{
				$key = '_avia_elements_theme_compatibility_mode'; //actiavates a compatibility mode for easier theme switching and keeping post options
			}


			$custom_fields = get_post_meta( $post->ID, $key, true );
			$custom_fields = apply_filters( 'avia_meta_box_filter_custom_fields', $custom_fields, $post->ID );


			//calls the helping function based on value of 'type'
			foreach( $this->box_elements as $element )
			{
				if( $element['slug'] == $box['id'] )
				{
					if( method_exists( $this->html, $element['type'] ) )
					{
						//replace default values
						if( isset( $custom_fields[ $element['id'] ] ) )
						{
							$element['std'] = $custom_fields[ $element['id'] ];
						}

						$output .= '<div class="avia_meta_box avia_meta_box_' . $element['type'] . ' meta_box_' . $box['context'] . '">';
						$output .= $this->html->render_single_element( $element );

						if( $element['type'] != 'visual_group_start' )
						{
							$output .= '</div>';
						}

						if( $element['type'] == 'visual_group_end' )
						{
							$output .= '</div>';
						}
					}
				}
			}
			//creates hidden data, nonce fields etc
			if( ! $this->hidden_data_set )
			{
				$output .= $this->html->hidden_data();
				$this->hidden_data_set = true;
			}

			echo $output;
		}

		/**
		 * Meta box saving
		 * This function hooks into the native wordpress post saving. Once a user saves a post the function first checks if we got new cloned option sets,
		 * creates them and saves them to the post meta table. That way each post can have an individual set of options. Then we iterate over each array
		 * entry and save, edit or delete the according post data
		 */
		public function save_post()
		{
			if( isset($_POST['post_ID'] ) )
			{
				$must_check = false;

				if( ! is_array( $this->default_boxes ) || ! isset( $_POST['post_ID'] ) || ! isset( $_POST['post_type'] ) || $this->saved )
				{
					return;
				}

				//check if a metabox was attached to this post type
				foreach( $this->default_boxes as $default_box )
				{
					if( in_array( $_POST['post_type'] ,$default_box['page'] ) )
					{
						$must_check = true;
					}
				}

				if( ! $must_check )
				{
					return;
				}

				check_ajax_referer( 'avia_nonce_save_metabox','avia-nonce' );


				//check if we got an options array and a post id or if it was already saved: if wordpress does an ajax save or creates a new page one of them might be unavailable


				//check which capability is needed to edit the current post/page
				$post_id = $_POST['post_ID'];
				$capability = 'edit_post';

				if ( 'page' == $_POST['post_type'] )
				{
					$capability = 'edit_page';
				}

				//does the user have the capability?
				if( ! current_user_can( $capability, $post_id  ) )
				{
					return $post_id ;
				}


				$this->saved = true;
				$meta_array = array();

				foreach( $this->box_elements as $box )
				{
					foreach( $_POST as $key => $value )
					{
						if( strpos( $key, $box['id'] ) !== false )
						{
							if( strpos( $key, 'on_save_' ) !== false )
							{
								$function = str_replace( 'on_save_', '', $key );

								$meta_array = apply_filters( 'avia_filter_save_meta_box_' . $function, $meta_array, $_POST );
							}

							$meta_array[ $key ] = $value;
						}
					}
				}

				$result = avia_ajax_save_options_create_array( $meta_array, true );
				update_post_meta( $post_id , '_avia_elements_' . $this->superobject->option_prefix, $result );

				//also save the data to a neutral field that can be used for compatibility with other themes
				update_post_meta( $post_id, '_avia_elements_theme_compatibility_mode', $result );

				//hook in case the value should be processed otherwise by an external function (example: slideshow first entry should be saved as post thumb)
				do_action( 'avia_meta_box_save_post', $post_id, $result );
			}
		}
	}
}