<?php

  class mw_data_versions extends mw_data{

    public function version($application_name){
      if(
        $version = $this->data_read(
          array(
            "table_name" => "versions",
            "index_name" => "application",
            "index_value" => $application_name
          )
        )
      ) return $version["version"];
      return false;
    }

    public function set_version($application_name, $version){
      if(
        (
          $data_version = $this->data_read(
            array(
              "table_name" => "versions",
              "index_name" => "application",
              "index_value" => $application_name
            )
          )
        ) === false
      ){
        return false;
      }
      if($data_version){
        if(
          !$this->data_update(
            array(
              "table_name" => "versions",
              "index_name" => "id",
              "index_value" => $data_version["id"],
              "values" => array(
                "version" => $version
              )
            )
          )
        ){
          return false;
        }
      }
      else{
        if(
          !$this->data_insert(
            array(
              "table_name" => "versions",
              "values" => array(
                "application" => $application_name,
                "version" => $version
              )
            )
          )
        ){
          return false;
        }
      }
      return true;
    }

  }