<?php
/**
 * @brief		Member Filter Extension
 * @author		<a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
 * @copyright	(c) Invision Power Services, Inc.
 * @license		https://www.invisioncommunity.com/legal/standards/
 * @package		Invision Community
 * @subpackage	Blogs
 * @since		23 Mar 2017
 */

namespace IPS\blog\extensions\core\MemberFilter;

/* To prevent PHP errors (extending class does not exist) revealing path */
if ( !defined( '\IPS\SUITE_UNIQUE_KEY' ) )
{
	header( ( isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0' ) . ' 403 Forbidden' );
	exit;
}

/**
 * Member Filter Extension
 */
class _Blog
{
	/**
	 * Determine if the filter is available in a given area
	 *
	 * @param	string	$area	Area to check
	 * @return	bool
	 */
	public function availableIn( $area )
	{
		return in_array( $area, array( 'bulkmail', 'group_promotions' ) );
	}

	/** 
	 * Get Setting Field
	 *
	 * @param	mixed	$criteria	Value returned from the save() method
	 * @return	array 	Array of form elements
	 */
	public function getSettingField( $criteria )
	{
		$options = array( 'any' => 'any', 'yes' => 'yes', 'no' => 'no' );

		return array(
			new \IPS\Helpers\Form\Radio( 'mf_has_blog', isset( $criteria['has_blog'] ) ? $criteria['has_blog'] : 'any', FALSE, array( 'options' => $options ) ),
		);
	}
	
	/**
	 * Save the filter data
	 *
	 * @param	array	$post	Form values
	 * @return	mixed			False, or an array of data to use later when filtering the members
	 * @throws \LogicException
	 */
	public function save( $post )
	{
		if( isset( $post['mf_has_blog'] ) and in_array( $post['mf_has_blog'], array( 'yes', 'no' ) ) )
		{
			return array( 'has_blog' => $post['mf_has_blog'] );
		}

		return FALSE;
	}
	
	/**
	 * Get where clause to add to the member retrieval database query
	 *
	 * @param	mixed				$data	The array returned from the save() method
	 * @return	string|array|NULL	Where clause
	 */
	public function getQueryWhereClause( $data )
	{
		if( isset( $data['has_blog'] ) )
		{
			return ( $data['has_blog'] == 'yes' ) ? array( array( "blog_blogs.blog_id IS NOT NULL" ) ) : array( array( "blog_blogs.blog_id IS NULL" ) );
		}

		return NULL;
	}
	
	/**
	 * Callback for member retrieval database query
	 * Can be used to set joins
	 *
	 * @param	mixed			$data	The array returned from the save() method
	 * @param	\IPS\Db\Query	$query	The query
	 * @return	void
	 */
	public function queryCallback( $data, &$query )
	{
		if( isset( $data['has_blog'] ) )
		{
			$query->join( 'blog_blogs', "core_members.member_id=blog_blogs.blog_member_id" );
		}

		return NULL;
	}

	/**
	 * Determine if a member matches specified filters
	 *
	 * @note	This is only necessary if availableIn() includes group_promotions
	 * @param	\IPS\Member	$member		Member object to check
	 * @param	array 		$filters	Previously defined filters
	 * @return	bool
	 */
	public function matches( \IPS\Member $member, $filters )
	{
		/* If we aren't filtering by this, then any member matches */
		if( !isset( $filters['has_blog'] ) OR !$filters['has_blog'] )
		{
			return TRUE;
		}

		$result = (bool) \IPS\Db::i()->select( 'COUNT(*)', 'blog_blogs', array( 'blog_member_id=?', $member->member_id ) )->first();

		return ( $filters['has_blog'] == 'no' ) ? !$result : $result;
	}
}