<?php

function on_site_update(){
	if( is_multisite() ){
		$list = list_of_site_meta_keys();
		$site_id = get_current_blog_id();
		foreach($list as $option){
			$value = __get_option($option);
			add_site_meta($site_id,$option,$value);
		}
	}
}

function add_site_meta( $site_id, $meta_key, $meta_value, $unique = false ) {
	// Bail if site meta table is not installed.
	if ( get_option( 'db_version' ) < 34370 ) {
		$list = list_of_site_meta_keys();
		if( in_array( $list ) && in_array( $option, $list) ){
			return add_blog_option ($site_id, $meta_key, $meta_value);
		}

		return false;
	}

	$added = add_metadata( 'blog', $site_id, $meta_key, $meta_value, $unique );

	// Bust site query cache.
	if ( $added ) {
		wp_cache_set( 'last_changed', microtime(), 'sites' );
	}

	return $added;
}


function delete_site_meta( $site_id, $meta_key, $meta_value = '' ) {
	// Bail if site meta table is not installed.
	if ( get_option( 'db_version' ) < 34370 ) {
		$list = list_of_site_meta_keys();
		if( is_array( $list ) && in_array( $option, $list) ){
			return delete_blog_option ($site_id, $meta_key);
		}

		return false;
	}

	$deleted = delete_metadata( 'blog', $site_id, $meta_key, $meta_value );

	// Bust site query cache.
	if ( $deleted ) {
		wp_cache_set( 'last_changed', microtime(), 'sites' );
	}

	return $deleted;
}

function get_site_meta( $site_id, $key = '', $single = false ) {
	// Bail if site meta table is not installed.
	if ( get_option( 'db_version' ) < 34370 ) {
		$list = list_of_site_meta_keys();
		if( is_array( $list ) && in_array( $option, $list) ){
			return get_blog_option ($site_id, $meta_key);
		}

		return false;
	}

    // backwards compat
    $pre = apply_filters( "pre_option_{$key}", false, $key );
	if ( false !== $pre ){
		return $pre;
	}
    
	$value = get_metadata( 'blog', $site_id, $key, $single );
	//backwards compat
	return apply_filters( "option_{$key}", maybe_unserialize( $value ), $key );
}

function update_site_meta( $site_id, $meta_key, $meta_value, $prev_value = '' ) {
	// Bail if site meta table is not installed.
	if ( get_option( 'db_version' ) < 34370 ) {
		$list = list_of_site_meta_keys();
		if( is_array( $list ) && in_array( $option, $list) ){
			return update_blog_option ($site_id, $meta_key, $meta_value);
		}

		return false;
	}

	$updated = update_metadata( 'blog', $site_id, $meta_key, $meta_value, $prev_value );

	// Bust site query cache.
	if ( $updated ) {
		wp_cache_set( 'last_changed', microtime(), 'sites' );
	}

	return $updated;
}

function list_of_site_meta_keys(){
    $list = array( 'blogname','siteurl','post_count','home','allowedthemes','blog_public','WPLANG','blogdescription','db_version');
    return apply_filters('list_of_site_meta_keys', $list);
}

function sync_update_option( $option, $old_value, $value ){
	$list = list_of_site_meta_keys();
	if(is_array($list) && !in_array( $option, $list) ){
		return;
	}
	$site_id = get_current_blog_id();
	update_site_meta( $site_id, $option, $value, $old_value ); 
	return;
}
add_action( 'updated_option', 'sync_update_option', 99, 3 );

function sync_add_option( $option, $value ){
	$list = list_of_site_meta_keys();
	if(is_array($list) && !in_array( $option, $list) ){
		return;
	}
	$site_id = get_current_blog_id();
	add_site_meta( $site_id, $option, $value ); 
	return;
}
add_action( 'added_option', 'sync_add_option', 99, 2 );

function sync_delete_option( $option ){
	$list = list_of_site_meta_keys();
	if(is_array($list) && !in_array( $option, $list) ){
		return;
	}
	$site_id = get_current_blog_id();
	delete_site_meta( $site_id, $option ); 
	return;
}
add_action( 'deleted_option', 'sync_delete_option', 99, 1 );