<?php
require_once( dirname(__FILE__) . '/scb/load.php' );

if ( ! class_exists( 'BJLL' ) ) {
	class BJLL {

		const version = '0.6.5';
		protected $_placeholder_url;
		protected $_skip_classes;
		
		protected static $_instance;

		function __construct() {

			// Disable when viewing printable page from WP-Print
			if ( intval( get_query_var( 'print' ) ) == 1 || intval( get_query_var( 'printpage' ) ) == 1 ) {
				return;
			}
			
			$options = self::_get_options();

			if ( 'yes' == $options->get( 'disable_on_wptouch' ) && self::is_wptouch() ) {
				return;
			}

			add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
			
			$skip_classes = $options->get( 'skip_classes' );
			if ( strlen( trim( $skip_classes ) ) ) {
				$this->_skip_classes = array_map( 'trim', explode( ',', $options->get( 'skip_classes' ) ) );
			}

			$this->_placeholder_url = $options->get( 'placeholder_url' );
			if ( ! strlen( $this->_placeholder_url ) ) {
				$this->_placeholder_url = plugins_url( '/img/placeholder.gif', __FILE__ );
			}
			
			if ( $options->get( 'filter_content' ) == 'yes' ) {
				add_filter( 'the_content', array( $this, 'filter' ), 200 );
			}
			if ( $options->get( 'filter_post_thumbnails' ) == 'yes' ) {
				add_filter( 'post_thumbnail_html', array( $this, 'filter' ), 200 );
			}
			if ( $options->get( 'filter_gravatars' ) == 'yes' ) {
				add_filter( 'get_avatar', array( $this, 'filter' ), 200 );
			}
		}
		
		static function singleton() {
			if ( ! isset( self::$_instance ) ) {
				$className = __CLASS__;
				self::$_instance = new $className;
			}
			return self::$_instance;
		}
		
		static function enqueue_scripts() {
		
			$in_footer = true;
			
			$options = self::_get_options();
			$theme_loader_function = $options->get( 'theme_loader_function' );
			
			if ( $theme_loader_function == 'wp_head' ) {
				$in_footer = false;
			}

			wp_enqueue_script( 'jquery.sonar', plugins_url( '/js/jquery.sonar.min.js', __FILE__ ), array( 'jquery' ), self::version, $in_footer );

			if ( defined( 'SCRIPT_DEBUG') && SCRIPT_DEBUG ) {
				wp_enqueue_script( 'BJLL', plugins_url( '/js/bj-lazy-load.js', __FILE__ ), array( 'jquery', 'jquery.sonar' ), self::version, $in_footer );
			} else {
				wp_enqueue_script( 'BJLL', plugins_url( '/js/bj-lazy-load.min.js', __FILE__ ), array( 'jquery', 'jquery.sonar' ), self::version, $in_footer );
			}

			$bjll_options = array();

			if ( $options->get('load_hidpi') == 'yes' || $options->get('load_responsive') == 'yes' ) {
				$bjll_options['thumb_base'] = plugins_url( '/thumb.php', __FILE__ ) . '?src=';
				$bjll_options['load_hidpi'] = $options->get('load_hidpi');
				$bjll_options['load_responsive'] = $options->get('load_responsive');
			}

			if ( $options->get('infinite_scroll') == 'yes' ) {
				$bjll_options['infinite_scroll'] = $options->get('infinite_scroll');
			}
			

			if ( count( $bjll_options ) ) {
				wp_localize_script( 'BJLL', 'BJLL', $bjll_options );
			}

		}
		
		static function filter( $content ) {
		
			$BJLL = BJLL::singleton();
			
			$options = self::_get_options();
			
			if ( $options->get('lazy_load_images') == 'yes' ) {
				$content = $BJLL->_filter_images( $content );
			}
			
			if ( $options->get('lazy_load_iframes') == 'yes' ) {
				$content = $BJLL->_filter_iframes( $content );
			}
		
			return $content;
		}
		
		protected function _filter_images( $content ) {
		
			$matches = array();
			preg_match_all( '/<img\s+.*?>/', $content, $matches );
			
			$search = array();
			$replace = array();

			if ( is_array( $this->_skip_classes ) ) {
				$skip_images_preg_quoted = array_map( 'preg_quote', $this->_skip_classes );
				$skip_images_regex = sprintf( '/class=".*(%s).*"/', implode( '|', $skip_images_preg_quoted ) );
			}
			
			foreach ( $matches[0] as $imgHTML ) {
				
				// don't to the replacement if a skip class is provided and the image has the class
				if ( ! ( is_array( $this->_skip_classes ) && preg_match( $skip_images_regex, $imgHTML ) ) ) {
					// replace the src and add the data-src attribute
					$replaceHTML = preg_replace( '/<img(.*?)src=/i', '<img$1src="' . $this->_placeholder_url . '" data-lazy-type="image" data-lazy-src=', $imgHTML );
					
					// add the lazy class to the img element
					if ( preg_match( '/class="/i', $replaceHTML ) ) {
						$replaceHTML = preg_replace( '/class="(.*?)"/i', 'class="lazy lazy-hidden $1"', $replaceHTML );
					} else {
						$replaceHTML = preg_replace( '/<img/i', '<img class="lazy lazy-hidden"', $replaceHTML );
					}
					
					$replaceHTML .= '<noscript>' . $imgHTML . '</noscript>';
					
					array_push( $search, $imgHTML );
					array_push( $replace, $replaceHTML );
				}
			}
			
			$content = str_replace( $search, $replace, $content );
		
		
			return $content;
		}
		
		protected function _filter_iframes( $content ) {
		
			$matches = array();
			preg_match_all( '/<iframe\s+.*?>/', $content, $matches );
			
			$search = array();
			$replace = array();
			
			foreach ( $matches[0] as $iframeHTML ) {

				// Don't mess with the Gravity Forms ajax iframe
				if ( strpos( $iframeHTML, 'gform_ajax_frame' ) ) {
					continue;
				}

				$replaceHTML = '<img src="' . $this->_placeholder_url . '"  class="lazy lazy-hidden" data-lazy-type="iframe" data-lazy-src="' . base64_encode($iframeHTML) . '" alt="">';
				
				$replaceHTML .= '<noscript>' . $iframeHTML . '</noscript>';
				
				array_push( $search, $iframeHTML );
				array_push( $replace, $replaceHTML );
			}
		
			$content = str_replace( $search, $replace, $content );
			
			return $content;
		}
		
		protected function _get_options() {
			return new scbOptions( 'bj_lazy_load_options', __FILE__, array(
				'filter_content'          => 'yes',
				'filter_post_thumbnails'  => 'yes',
				'filter_gravatars'        => 'yes',
				'lazy_load_images'        => 'yes',
				'lazy_load_iframes'       => 'yes',
				'theme_loader_function'   => 'wp_footer',
				'placeholder_url'         => '',
				'skip_classes'            => '',
				'load_hidpi'              => 'no',
				'load_responsive'         => 'no',
				'disable_on_wptouch'      => 'no',
				'infinite_scroll'         => 'no'
			) );
		}
		
		function options_init() {
		
			$options = self::_get_options();

			// Creating settings page objects
			if ( is_admin() ) {
				require_once( dirname( __FILE__ ) . '/admin.php' );
				new BJLL_Admin_Page( __FILE__, $options );
			}
		}

		static function is_wptouch() {
			if ( function_exists( 'bnc_wptouch_is_mobile' ) && bnc_wptouch_is_mobile() ) {
				return true;
			}

			global $wptouch_pro;

			if ( defined( 'WPTOUCH_VERSION' ) || is_object( $wptouch_pro ) ) {
				
				if ( $wptouch_pro->showing_mobile_theme ) {
					return true;
				}
			}

			return false;
		}

		static function has_wptouch() {
			if ( function_exists( 'bnc_wptouch_is_mobile' ) || defined( 'WPTOUCH_VERSION' ) ) {
				return true;
			}

			return false;
		}
		
	}
}


add_action( 'wp', create_function('', 'if ( ! is_feed() ) { BJLL::singleton(); }'), 10, 0 );

scb_init( array( 'BJLL', 'options_init' ) );