<?php

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 ) {
		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 ) {
		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 ) {
		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 ) {
		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');
    return apply_filters('list_of_site_meta_keys', $list);
}

function sync_update_option( $option, $old_value, $value ){
	$list = list_of_site_meta_keys();
	if(!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(!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(!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 );