<?php
namespace PressForward\Controllers;

use PressForward\Interfaces\SystemMeta;
use PressForward\Interfaces\System;
/**
 * Functionality related to nominations
 */
class Metas {

    //var $meta_interface;

    function __construct( SystemMeta $metas, System $system ) {
        $this->meta_interface = $metas;
		$this->system = $system;
		$this->master_field = 'pf_meta';

	}

	/**
	 * Take an array of objects describing post_metas and set them to the id of a post.
	 *
	 * @since 3.x
	 *
	 * @param int $id A post object ID number.
	 * @param array $args {
	 * 			An array of objects containing post_meta data.
	 *
	 * 			@var array {
	 *						@var string $name The post_meta slug.
	 * 						@var string $value The post_meta's value.
	 *			}
	 * }
	 *
	 */
	function establish_post($id, $args){
		foreach ($args as $arg){
			$this->add_pf_meta($id, $arg['name'], $arg['value'], true);
		}
	}

	/**
	 * Takes a post_meta name and a post_meta value and turns it into an for use.
	 *
	 * @return array An array useful in thevarious parts of the post_meta setting process.
	 *
	 */
	function meta_for_entry($key, $value){
		return array(
			'name'	=>	$key,
			'value'	=>	$value
		);
	}

	/**
	 * With two post IDs copy all the standard PressForward meta from one post to another.
	 *
	 * @param int $idA The ID of the post that has all the meta info already set.
	 * @param int $idB The ID of the post that needs to have the meta info attached to it.
	 *
	 */
	function transition_post_meta($idA, $idB, $term_transition = false){
		if ( ( !is_string( $idA ) || !is_string( $idB ) ) && ( !is_numeric($idA) || !is_numeric($idB) ) ){
			pf_log( 'Post meta transition failed.' );
			pf_log( $idA );
			pf_log( $idB );
			pf_log( $term_transition );
			return;
		}
		pf_log('Transition post '.$idA.' to '.$idB);
		foreach($this->structure() as $meta){
            $post_types = apply_filters( 'pf_transition_post_meta', array('item', 'nomination', 'post'));
            $level_check = false;
            foreach ( $meta['level'] as $level ){
                if ( in_array( $level, $post_types ) ){
                    $level_check = true;
                }
            }
            if ( $level_check ){
			    $this->transition_meta($this->get_name($meta), $idA, $idB);
            } else {
                return;
            }
		}
		if ( $term_transition ){
			pf_log('Transitioning Terms.');
			$this->transition_meta_terms($idA, $idB);
		}
	}

	function transition_meta_terms($idA, $idB){
		$parent = wp_get_post_parent_id($idA);
		$ids = array($idA);
		if ( !empty($parent) && !is_wp_error( $parent ) ){
			$ids[] = $parent;
		}
		$item_id = $this->get_post_pf_meta($idA, 'pf_item_post_id');
		if ( !empty($item_id) && !is_wp_error( $item_id ) ){
			$ids[] = $item_id;
		}
		/**$parent_parent = wp_get_post_parent_id( $parent );
		if ( !empty($parent_parent) && !is_wp_error( $parent_parent ) ){
			$ids[] = $parent_parent;
		}**/
		$term_objects = wp_get_object_terms( $ids, array( pressforward('schema.feeds')->tag_taxonomy, 'post_tag', 'category' ) );
		$item_tags = $this->get_post_pf_meta($idA, 'item_tags');
		if ( !empty($term_objects) ){
			foreach ( $term_objects as $term ){
				wp_set_object_terms($idB, $term->term_id, $term->taxonomy, true);
				if ( pressforward('schema.feeds')->tag_taxonomy == $term->taxonomy ){
					$check = $this->cascade_taxonomy_tagging($idB, $term->slug, 'slug');
					if (!$check){
						$this->build_and_assign_new_taxonomy_tag($idB, $term->name);
					}
				}
			}
		}
		$this->handle_item_tags($idB, $item_tags);
	}

	public function handle_item_tags( $idB, $item_tags ){
		if ( !empty($item_tags) ){
			pf_log('Attempting to attach item_tags.');
			if ( !is_array( $item_tags ) ){
				pf_log($item_tags);
				$item_tags = explode(',',$item_tags);
			}
			foreach ($item_tags as $tag){
				$tag = trim($tag);
				$check = $this->cascade_taxonomy_tagging($idB, $tag, 'name');
				if (!$check){
					$this->build_and_assign_new_taxonomy_tag($idB, $tag);
				}
			}
		}
	}

	/**
	 * If term exists among current categories or terms, assign it.
	 * @param  [type] $idB          [description]
	 * @param  [type] $term_id      [description]
	 * @param  string $term_id_type [description]
	 * @return [type]               [description]
	 */
	function cascade_taxonomy_tagging($idB, $term_id, $term_id_type = 'slug'){
		pf_log('Trying to assign taxonomy for '.$idB);
		$term_object = get_term_by($term_id_type, $term_id, 'category');
		if ( empty( $term_object ) ){
			pf_log('No category match.');
			$term_object = get_term_by($term_id_type, $term_id, 'post_tag');
			if ( empty( $term_object ) ){
				pf_log('No post_tag match.');
				return false;
			} else {
				return wp_set_object_terms( $idB, $term_object->term_id, 'post_tag', true );

			}
		} else {
			return wp_set_object_terms( $idB, $term_object->term_id, 'category', true );
		}
		return true;
	}

	/**
	 * When no tag exists, PF will use this function to build and assign a new
	 * post tag.
	 * @param  [type] $idB           [description]
	 * @param  [type] $full_tag_name [description]
	 * @return [type]                [description]
	 */
	function build_and_assign_new_taxonomy_tag($idB, $full_tag_name){
		pf_log('Attaching new tag to '.$idB.' with a name of '.$full_tag_name);
		$term_args = array(
							'description'	=>	'Added by PressForward',
							'parent'		=>	0,
							'slug'			=>	pf_slugger($full_tag_name)
						);
		$r = wp_insert_term($full_tag_name, 'post_tag', $term_args);
		if ( !is_wp_error( $r ) && !empty($r['term_id']) ){
			pf_log('Making a new post_tag, ID:'.$r['term_id']);
			wp_set_object_terms( $idB, $r['term_id'], 'post_tag', true );
		} else {
			pf_log('Failed making a new post_tag');
			pf_log($r);
		}
	}

	/**
	 * With a post_meta slug and two post IDs copy a post_meta from one post to another.
	 *
	 * @param string $name The post_meta slug.
	 * @param int $idA The post which already has the post_meta data.
	 * @param int $idB The post which needs the post_meta copied to it.
	 *
	 * @return int The result of the update_post_meta function.
	 *
	 */
	function transition_meta($name, $idA, $idB){
		pf_log('Transition '.$idA.' meta field '.$name);
		$meta_value = $this->meta_interface->get_meta($idA, $name, true);
		$result = $this->check_for_and_transfer_depreciated_meta($name, $meta_value, $idA, $idB);
		if (!$result){
			pf_log($name.' not depreciated, updating on post '.$idB);
			$result = $this->meta_interface->update_meta($idB, $name, $meta_value);
		}

		return $result;
	}

	/**
	 * Check a post_meta slug and insure that the correct post_meta is being set.
	 *
	 * Considers a post_meta slug and checkes it against a list for depreciation.
	 * If the post_meta slug has been depreciated update the new slug and the old one.
	 *
	 * Based on http://seoserpent.com/wordpress/custom-author-byline
	 *
	 * @since 3.x
	 *
	 * @param string $name The post_meta slug.
	 * @param string $value The post_meta value.
	 * @param int $idA The id of the post that already has the post_meta set.
	 * @param int $idB The id of the post that needs the post_meta set.
	 *
	 * @return bool True if the post_meta is supported by PressForward.
	 */
	function check_for_and_transfer_depreciated_meta($name, $value, $idA, $idB){
		foreach ($this->structure() as $meta){
			if ($meta['name'] == $name){
				if (in_array('dep', $meta['type'])){
					pf_log( $name.' is a depreciated meta type. Prepping to transfer to '.$meta['move'] );
					if ((!isset($value)) || (false == $value) || ('' == $value) || (0 == $value) || (empty($value))){
						pf_log('No value was passed. Get meta data from new meta key.');
						$value = $this->meta_interface->get_meta($idA, $meta['move'], true);
					}
					//update_post_meta($idA, $name, $value);
					$this->meta_interface->update_meta($idB, $meta['move'], $value);
					//update_post_meta($idB, $name, $value);
					return true;
				}
			}
		}
		return false;
	}

	/**
	 * Get the meta by its name, if it is supported by PressForward.
	 *
	 * @since 3.x
	 *
	 * @param string $name The meta name we're checking to see if it is an
	 *						an official PF meta.
	 *
	 * @return string|bool 	Returns PF meta object, false if not.
	 */
	function by_name($name){
		foreach ($this->structure() as $meta){
			if($name == $meta['name']){
				return $meta;
			} else {
				pf_log($name. ' is not a PF meta type.');
				return false;
			}
		}
	}

	/**
	 * Return a PF Meta Object that is assuredly not depreciated.
	 * @param  [type] $name [description]
	 * @return [type]       [description]
	 */
	function assure_key($name){
		$meta = $this->by_name($name);
		//pf_log('Assuring '.$name.' is PF meta.');
		if ( ( false !== $meta ) && !empty( $meta['move'] ) ){
			return $this->by_name( $meta['move'] );
		} else {
			pf_log($name.' is not PF meta.');
			return array( 'name' => $name, 'error' => 'not_pf_meta' );
		}
	}

	/**
	 * Return the meta database key.
	 *
	 * @param  [type] $name [description]
	 * @return [type]       [description]
	 */
	function get_key( $name ){
		$meta = $this->assure_key( $name );
		return $this->get_name( $meta );
	}

	/**
	 * Get the name (database key) out of the meta object.
	 */
	function get_name($meta){
		return $meta['name'];
	}

	/**
	 * Get an array representing all the approved post_meta objects for PressForward.
	 *
	 * @since 3.x
	 *
	 * @return array An object describing all the post_metas used by PressForward.
	 */
	function structure(){
		#Inspired by http://www.loc.gov/standards/metable.html
		#Adm=Administrative, Struc=Structural, Desc=Descriptive, Req=Required, Rep=Repeatable, Set=Set, Aggr=Aggregate, Dep = Depreciated

		$metas = array(
			'item_id' => array(
				'name' => 'item_id',
				'definition' => __('Unique PressForward ID', 'pf'),
				'function'	=> __('Stores hashed ID based on title and URL of retrieved item', 'pf'),
				'type'	=> array('struc'),
				'use'	=> array('req'),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> false
			),
			'pf_meta' => array(
				'name' => 'pf_meta',
				'definition' => __('Serialized PF data', 'pf'),
				'function'	=> __('Array of PF data that can be serialized', 'pf'),
				'type'	=> array('struc'),
				'use'	=> array('req'),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> false
			),
			'origin_item_ID' => array(
				'name' => 'origin_item_ID',
				'definition' => __('DUPE Soon to be depreciated version of item_id', 'pf'),
				'function'	=> __('Stores hashed ID based on title and URL of retrieved item', 'pf'),
				'type'	=> array('struc', 'dep'),
				'use'	=> array('req'),
				'move'	=> 'item_id',
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'pf_item_post_id' => array(
				'name' => 'pf_item_post_id',
				'definition' => __('The WordPress postID associated with the original item', 'pf'),
				'function'	=> __('Stores hashed WP post_ID associated with the original item', 'pf'),
				'type'	=> array('struc'),
				'use'	=> array('req'),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> false
			),
			'nom_id' => array(
				'name' => 'nom_id',
				'definition' => __('The WordPress postID associated with the nomination item', 'pf'),
				'function'	=> __('Stores nomination id', 'pf'),
				'type'	=> array('struc'),
				'use'	=> array('req'),
				'level'	=> array('nomination', 'post'),
				'serialize'	=> false
			),
			'pf_nomination_post_id' => array(
				'name' => 'pf_nomination_post_id',
				'definition' => __('The WordPress postID associated with the nomination', 'pf'),
				'function'	=> __('Stores postID associated with the nominated item', 'pf'),
				'type'	=> array('struc'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'item_feed_post_id' => array(
				'name' => 'item_feed_post_id',
				'definition' => __('DUPE Soon to be depreciated version of pf_item_post_id', 'pf'),
				'function'	=> __('Stores hashed ID based on title and URL of retrieved item', 'pf'),
				'type'	=> array('struc', 'dep'),
				'use'	=> array('req'),
				'move'	=> 'pf_item_post_id',
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'source_title' => array(
				'name' => 'source_title',
				'definition' => __('Title of the item\'s source', 'pf'),
				'function'	=> __('Stores the title retrieved from the feed.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'pf_source_link' => array(
				'name' => 'pf_source_link',
				'definition' => __('URL of the item\'s source', 'pf'),
				'function'	=> __('Stores the url of feed source.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'pf_feed_item_source' => array(
				'name' => 'pf_feed_item_source',
				'definition' => __('DUPE Soon to be depreciate version of source_title.', 'pf'),
				'function'	=> __('Stores the title retrieved from the feed.', 'pf'),
				'type'	=> array('desc','dep'),
				'use'	=> array('req'),
				'move'	=> 'source_title',
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'item_date' => array(
				'name' => 'item_date',
				'definition' => __('Date posted on the original site', 'pf'),
				'function'	=> __('Stores the date the item was posted on the original site', 'pf'),
				'type'	=> array('desc'),
				'use'	=> array('req'),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> false
			),
			'posted_date' => array(
				'name' => 'posted_date',
				'definition' => __('DUPE The soon to be depreciated version of item_date', 'pf'),
				'function'	=> __('Stores the date given by the source.', 'pf'),
				'type'	=> array('struc', 'dep'),
				'use'	=> array('req'),
				'move'	=> 'item_date',
				'level'	=> array('nomination', 'post'),
				'serialize'	=> true
			),
			'item_author' => array(
				'name' => 'item_author',
				'definition' => __('Author(s) listed on the original site', 'pf'),
				'function'	=> __('Stores array value containing authors listed in the source feed.', 'pf'),
				'type'	=> array('struc'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> false
			),
			'authors' => array(
				'name' => 'authors',
				'definition' => __('DUPE The soon to be depreciated version of item_author', 'pf'),
				'function'	=> __('Stores a comma-separated set of authors as listed in the source feed', 'pf'),
				'type'	=> array('struc','dep'),
				'use'	=> array(),
				'move'	=> 'item_author',
				'level'	=> array('nomination', 'post'),
				'serialize'	=> true
			),
			'item_link' => array(
				'name' => 'item_link',
				'definition' => __('Source link', 'pf'),
				'function'	=> __('Stores link to the origonal post.', 'pf'),
				'type'	=> array('struc'),
				'use'	=> array('req'),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> false
			),
			'nomination_permalink' => array(
				'name' => 'item_link',
				'definition' => __('Source link', 'pf'),
				'function'	=> __('DUPE Soon to be depreciated version of item_link', 'pf'),
				'type'	=> array('struc','dep'),
				'use'	=> array('req'),
				'move'	=> 'item_link',
				'level'	=> array('nomination', 'post'),
				'serialize'	=> true
			),
			'item_feat_img' => array(
				'name' => 'item_feat_img',
				'definition' => __('Featured image from source', 'pf'),
				'function'	=> __('A featured image associated with the item, when it is available', 'pf'),
				'type'	=> array('struc'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'item_wp_date' => array(
				'name' => 'item_wp_date',
				'definition' => __('Time item was retrieved', 'pf'),
				'function'	=> __('The datetime an item was added to WordPress via PressForward', 'pf'),
				'type'	=> array('desc'),
				'use'	=> array('req'),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> false
			),
			'date_nominated' => array(
				'name' => 'date_nominated',
				'definition' => __('Time nominated', 'pf'),
				'function'	=> __('The datetime the item was made a nomination', 'pf'),
				'type'	=> array('desc'),
				'use'	=> array('req'),
				'level'	=> array('nomination', 'post'),
				'serialize'	=> true
			),
			'item_tags' => array(
				'name' => 'item_tags',
				'definition' => __('Tags associated with the item by source', 'pf'),
				'function'	=> __('An array of tags associated with the item, as created in the feed', 'pf'),
				'type'	=> array('desc'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'source_repeat' => array(
				'name' => 'source_repeat',
				'definition' => __('Times retrieved', 'pf'),
				'function'	=> __('Counts number of times the item has been collected from the multiple feeds (Ex: from origin feed and Twitter)', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'nomination_count' => array(
				'name' => 'nomination_count',
				'definition' => __('Nominations', 'pf'),
				'function'	=> __('Counts number of times users have nominated an item', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array('req'),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> false
			),
			'submitted_by' => array(
				'name' => 'submitted_by',
				'definition' => __('The user who submitted the nomination', 'pf'),
				'function'	=> __('The first user who submitted the nomination (if it has been nominated). User ID number', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array('req'),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'nominator_array' => array(
				'name' => 'nominator_array',
				'definition' => __('Users who nominated this item', 'pf'),
				'function'	=> __('Stores and array of all userIDs that nominated the item in an array', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array('req'),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'sortable_item_date' => array(
				'name' => 'sortable_item_date',
				'definition' => __('Timestamp for the item', 'pf'),
				'function'	=> __('A version of the item_date meta that\'s ready for sorting. Should be a Unix timestamp', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array('req'),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> false

			),
			'readable_status' => array(
				'name' => 'readable_status',
				'definition' => __('If the content is readable', 'pf'),
				'function'	=> __('A check to determine if the content of the item has been made readable', 'pf'),
				'type'	=> array('desc'),
				'use'	=> array('req'),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'revertible_feed_text' => array(
				'name' => 'revertible_feed_text',
				'definition' => __('The originally retrieved description', 'pf'),
				'function'	=> __('The original description, excerpt or content text given by the feed', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'pf_feed_item_word_count' => array(
				'name' => 'pf_feed_item_word_count',
				'definition' => __('Word count of original item text', 'pf'),
				'function'	=> __('Stores the count of the original words retrieved with the feed item', 'pf'),
				'type'	=> array('desc'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> true
			),
			'pf_archive' => array(
				'name' => 'pf_archive',
				'definition' => __('Archive state of the item', 'pf'),
				'function'	=> __('Stores if the item has been archived', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> false
			),
			'_thumbnail_id' => array(
				'name' => '_thumbnail_id',
				'definition' => __('Thumbnail id', 'pf'),
				'function'	=> __('The ID of the featured item', 'pf'),
				'type'	=> array('adm','struc'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination', 'post'),
				'serialize'	=> false
			),
			'archived_by_user_status' => array(
				'name' => 'archived_by_user_status',
				'definition' => __('Users who have archived', 'pf'),
				'function'	=> __('Stores users who have archived.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('item', 'nomination' ),
				'serialize'	=> true
			),
			'pf_feed_error_count' => array(
				'name' => 'pf_feed_error_count',
				'definition' => __('Count of feed errors', 'pf'),
				'function'	=> __('Stores a count of the number of errors a feed has experianced', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('feed', 'post'),
				'serialize'	=> true
			),
            'pf_forward_to_origin'  => array(
				'name' => 'pf_forward_to_origin',
				'definition' => __('User override for forwarding to origin of link', 'pf'),
				'function'	=> __('Stores forwarding override for posts', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('post'),
				'serialize'	=> false
			),
			'pf_feed_last_retrieved' => array(
				'name' => 'pf_feed_last_retrieved',
				'definition' => __('Last time feed was retrieved', 'pf'),
				'function'	=> __('Stores last timestamp feed was retrieved.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('feed'),
				'serialize'	=> false
			),
			'pf_feed_last_retrieved' => array(
				'name' => 'pf_feed_last_retrieved',
				'definition' => __('Last time feed was retrieved', 'pf'),
				'function'	=> __('Stores last timestamp feed was retrieved.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('feed'),
				'serialize'	=> false
			),
			'feedUrl' => array(
				'name' => 'feedUrl',
				'definition' => __('URL for a feed', 'pf'),
				'function'	=> __('Stores location online for feed.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('feed'),
				'serialize'	=> false
			),
            'pf_feed_last_checked' => array(
				'name' => 'pf_feed_last_checked',
				'definition' => __('Last time feed was checked', 'pf'),
				'function'	=> __('Stores last timestamp feed was checked.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('feed'),
				'serialize'	=> false
			),
            'pf_no_feed_alert' => array(
				'name' => 'pf_no_feed_alert',
				'definition' => __('Feed Alert Status', 'pf'),
				'function'	=> __('A check to see if an alert is on the feed.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('feed'),
				'serialize'	=> false
			),
			'feed_type' => array(
				'name' => 'feed_type',
				'definition' => __('Type of feed', 'pf'),
				'function'	=> __('Field stores the type of feed (like RSS or OPML) the object holds.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('feed'),
				'serialize'	=> false
			),
			'htmlUrl'	=>	array(
				'name' => 'htmlUrl',
				'definition' => __('Site URL of a feed.', 'pf'),
				'function'	=> __('The home URL of a feed.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('feed'),
				'serialize'	=> false
			),
			'user_added'	=>	array(
				'name' => 'user_added',
				'definition' => __('User who added a feed..', 'pf'),
				'function'	=> __('Track who added a subscribed or under review feed.', 'pf'),
				'type'	=> array('adm','struc'),
				'use'	=> array(),
				'level'	=> array('feed'),
				'serialize'	=> false
			),
			'module_added'	=>	array(
				'name' => 'module_added',
				'definition' => __('Module to process a feed.', 'pf'),
				'function'	=> __('The feed should be processed with this module.', 'pf'),
				'type'	=> array('adm','struc'),
				'use'	=> array(),
				'level'	=> array('feed'),
				'serialize'	=> false
			),
			'ab_alert_msg'	=>	array(
				'name' => 'ab_alert_msg',
				'definition' => __('Alert Message processing and storage.', 'pf'),
				'function'	=> __('Stores a feed alert to be processed.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('feed'),
				'serialize'	=> false
			),
			'meta_data' => array(
				'name' => 'meta_data',
				'definition' => __('Has metadata been compleatly added to a feed?', 'pf'),
				'function'	=> __('Store a value to indicate the meta-processing of a feed has completed.', 'pf'),
				'type'	=> array('adm'),
				'use'	=> array(),
				'level'	=> array('feed'),
				'serialize'	=> false
			),
		);

		$metas = apply_filters('pf_meta_terms',$metas);
		return $metas;
	}

	/*
	 * A function to check and retrieve the right meta field for a post.
	 */
	function pass_meta($field, $id = false, $value = '', $single = true){
	    $metas = $this->structure();
	    # Check if it exists.
	    if (empty($metas[$field])){
	        pf_log('The field ' . $field . ' is not supported.');
					return $field;
	    }
		# Check if it has been depreciated (dep). If so retrieve
	    if (in_array('dep',$metas[$field]['type'])){
			$new_field = $metas[$field]['move'];
			pf_log('You tried to use depreciated field '.$field.' it was moved to '.$new_field);
			$this->transition_depreciated_meta($field, $id, $value, $single, $new_field);
	        $field = $new_field;
	    }

		if ( $metas[$field]['serialize'] ){
			return array('field' => $field, 'master_field' => $this->master_field);
		}
	    return $field;

	}

	/**
	 * Transitions meta values from old depreciated meta_slugs to new ones.
	 *
	 */
	function transition_depreciated_meta($field, $id, $value, $single, $new_field){
		$result = false;
		# Note - empty checks for FALSE
		$old = $this->meta_interface->get_meta($id, $field, $single);
		$new = $this->meta_interface->get_meta($id, $new_field, $single);
		if ((false != $id) && !empty($old) && empty($new)){
			if (empty($value)){
				$result = $this->meta_interface->update_meta($id, $new_field, $old);
			} else {
				$result = $this->meta_interface->update_meta($id, $new_field, $value);
			}
		}
		return $result;
	}

	/**
	 * Retrieve post_meta data in a way that insures the correct value is pulled.
	 *
	 * Function allows users to retrieve the post_meta in a safe way standerdizing against
	 * the list of accepted PressForward meta_slugs. It deals with depreciated post_meta.
	 *
	 * @since 3.x
	 *
	 * @param int $id Post ID.
	 * @param string $field The post_meta field to retrieve.
	 * @param bool $obj If the user wants to return a PressForward post_meta description object. Default false.
	 * @param bool $single If the user wants to use the WordPress post_meta Single decleration. Default true.
	 *
	 * @return string|array Returns the result of retrieving the post_meta or the self-descriptive meta-object with value.
	 */
	function retrieve_meta($id, $field, $obj = false, $single = true){
	    $field = $this->pass_meta($field, $id);
		$serialized = false;
		if ( is_array($field) ){
			$key = $field['field'];
			$field = $field['master_field'];
			$serialized = true;
			$single = true;
		}
	    $meta = $this->meta_interface->get_meta($id, $field, $single);
		if ( $serialized ){
			if ( empty($meta) || !array_key_exists($key, $meta) ){
				$old_meta = $this->meta_interface->get_meta($id, $key, $single);
				$meta[$key] = $old_meta;
				$this->meta_interface->update_meta($id, $field, $meta);
				$this->meta_interface->delete_meta($id, $key, $old_meta);
				$meta = $old_meta;
			} else {
				$meta = $meta[$key];
			}
			//pf_log($key);
			//pf_log($meta);
			$meta = $this->check_value($meta, $id, $key);
		} else {
			$meta = $this->check_value($meta, $id, $field);
		}
		//pf_log($field);
		//pf_log($meta);
	    if ($obj){
	        $metas = $this->structure();
	        $meta_obj = $metas[$field];
	        $meta_obj['value'] = $meta;
	        return $meta_obj;
	    }
	    return $meta;

	}

	public function check_value($meta_value, $id, $field){
		switch ($field) {
			case 'item_link':
				if (empty($meta_value)){
					$meta_value = pressforward('controller.system')->get_the_guid($id);
				}
				break;

			default:
				# code...
				break;
		}
		return $meta_value;
	}

	/**
	 * An alias for $this->retrieve_meta that allows you to use the standard argument set from get_post_meta.
	 *
	 */
	function get_post_pf_meta($id, $field, $single = true, $obj = false){

			return $this->retrieve_meta($id, $field, $obj, $single);

	}

	function get_all_meta_keys(){
		$meta_keys = array();
		foreach($this->structure() as $meta){
			$meta_keys[] = $this->get_name($meta);
		}
		return $meta_keys;
	}

	public function get_all_metas( $post_id ){
		$all_metas = $this->meta_interface->get_metas( $post_id );
		$structure = $this->structure();
		foreach ( $all_metas as $key=>$meta ){
			if ( $structure[$key]['serialize'] ){
				$all_metas[$key] = $this->get_post_pf_meta( $post_id, $key );
			}
		}
		return $all_metas;

	}

	/**
	 * Update post_meta on a post using PressForward post_meta standardization.
	 *
	 * @param int|string $id The post ID.
	 * @param string $field The post_meta field slug.
	 * @param string $value The post_meta value.
	 * @param string $prev_value The previous value to insure proper replacement.
	 *
	 * @return int The check value from update_post_meta.
	 */
	function update_pf_meta($id, $field, $value = '', $prev_value = NULL){
	    $field = $this->pass_meta($field, $id, $value);
	    $check = $this->apply_pf_meta($id, $field, $value, $prev_value);
	    return $check;

	}

	function get_author_from_url($url){
		$response = pf_file_get_html( $url );
		$possibles = array();
		if (empty($response)){
			return false;
		}
		$possibles[] = $response->find('meta[name=author]', 0);
		$possibles[] = $response->find('meta[name=Author]', 0);
		$possibles[] = $response->find('meta[property=author]', 0);
		$possibles[] = $response->find('meta[property=Author]', 0);
		$possibles[] = $response->find('meta[name=parsely-author]', 0);
		$possibles[] = $response->find('meta[name=sailthru.author]', 0);

		foreach ($possibles as $possible){
			if ( false != $possible ){
				$author_meta = $possible;
				break;
			}
		}

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

		$author = $author_meta->content;
		$author = trim(str_replace("by","",$author));
		$author = trim(str_replace("By","",$author));
		return $author;
	}

	/**
	 * Add post_meta on a post using PressForward post_meta standardization.
	 *
	 * @param int|string $id The post ID.
	 * @param string $field The post_meta field slug.
	 * @param string $value The post_meta value.
	 * @param string $unique If the post_meta is unique.
	 *
	 * @return int The check value from add_post_meta.
	 */
	function add_pf_meta($id, $field, $value = '', $unique = true){
	    $field = $this->pass_meta($field, $id, $value, $unique);
	    $check = $this->apply_pf_meta($id, $field, $value, $unique, 'add');
	    return $check;

	}

	function apply_pf_meta($id, $field, $value = '', $state = null, $apply_type = 'update'){
		$serialized = false;
		if ( is_array($field) ){
			$key = $field['field'];
			$field = $field['master_field'];
			$serialized = true;
			//pf_log($key);
		}
		//pf_log($field.': ');
		//pf_log($value);
		if ( $serialized ){
			$switch_value = $key;
		} else {
			$switch_value = $field;
		}
		switch ($switch_value) {
			case 'nominator_array':
				$nominators = $this->get_post_pf_meta($id, $key);
				if ( !is_array( $value ) ){
					$value = array( $value );
				}
				if ( !is_array( $nominators ) ){
					$nominators = array( $nominators );
				}
				//We are doing a removal.
				if ( 1 == count(array_diff($value, $nominators) ) ){
					$nominators = array_unique( $value );
					continue;
				}
				if ( !is_array($value) ){
					$value = array($value);
				}
				$nominators = array_merge( $nominators, $value );
				$nominators = array_unique( $nominators );
				$value = $nominators;
				break;
			case 'item_author':
				if ( empty($value) ){
					$site = $this->get_post_pf_meta($id, 'source_title');
					if ( empty( $site ) ){
						$value = 'Author on source';
					} else {
						$value = $site;
					}
				}
				break;
			default:
				# code...
				break;
		}
		if ( $serialized ){
			$master_meta = $this->meta_interface->get_meta($id, $field, true);
			//pf_log($master_meta);
			if ( empty($master_meta) ){
				$master_meta = array();
				$apply_type = 'add';
				$state = true;
			} else {
				$apply_type = 'update';
				$state = $master_meta;
			}
			$master_meta[$key] = $value;
			$value = $master_meta;
			//pf_log($value);
		}
		if ( 'update' == $apply_type ){
			if ( $serialized ){
				//pf_log($key);
				$this->meta_interface->delete_meta($id, $key, '');
			}
			$check = $this->meta_interface->update_meta($id, $field, $value, $state);
			if (!$check){
				$check = $this->meta_interface->update_meta($id, $field, $value, $state);
			}
		} elseif ( 'add' == $apply_type ) {
			$check = $this->meta_interface->add_meta($id, $field, $value, $state);
		}
		//pf_log($field);
		//pf_log($value);
		//pf_log($check);
		return $check;
	}

}