<?php

  class mw_data_config extends mw_data{

    public function config($key = null){
      $value = false;
      if(isset($key)){
        $value = "";
        if(
          (
            $config = $this->data_read(
              array(
                "table_name" => "config",
                "index_name" => "key",
                "index_value" => $key
              )
            )
          ) === false
        ) return false;
        if(isset($config["value"])) $value = $config["value"];
      }
      else{
        $value = array();
        if(
          (
            $config_list = $this->data_list(
              array(
                "table_name" => "config",
                "index_name" => "key"
              )
            )
          ) === false
        ) return false;
        foreach($config_list["list"] as $config) $value[$config["key"]] = $config["value"];
      }
      return $value;
    }

    public function config_exists($key){
      if(
        (
          $config = $this->data_read(
            array(
              "table_name" => "config",
              "index_name" => "key",
              "index_value" => $key
            )
          )
        ) === false
      ) return false;
      return $config ? 1 : 0;
    }

    public function set_config($key, $value){
      if(
        (
          $config = $this->data_read(
            array(
              "table_name" => "config",
              "index_name" => "key",
              "index_value" => $key
            )
          )
        ) === false
      ) return false;
      if($config){
        return $this->data_update(
          array(
            "table_name" => "config",
            "index_name" => "key",
            "index_value" => $key,
            "values" => array(
              "value" => $value
            )
          )
        );
      }
      else{
        return $this->data_insert(
          array(
            "table_name" => "config",
            "values" => array(
              "key" => $key,
              "value" => $value
            )
          )
        );
      }
    }

    public function del_config($key){
      return $this->data_delete(
        array(
          "table_name" => "config",
          "index_name" => "key",
          "index_value" => $key
        )
      );
    }

  }