<?php

  class mw_env_data extends mw_env{

    public $data;

    public function set_data(&$data){
      $this->data = &$data;
    }

    public function data(){
      return isset($this->data) ? $this->data : false;
    }

  }

  // -------------------------------------------------------------------------------------------
  //                                                                               class mw_data
  //

  class mw_data extends empty_class{

    public function call_default($inst, $method_name, $arguments){
      return $this->call_data_auto_crud($method_name, $arguments);
    }

  }

  // -------------------------------------------------------------------------------------------
  //                                                                               class mw_sgbd
  //

  abstract class mw_sgbd{

    public $env;
    public $link;
    public $host;
    public $base;
    public $user;
    public $password;
    public $EXTENTION_OK;

    public function __construct($env, $params = array()){
      $this->env = $env;
      $default_params = $this->default_params();
      $params = $this->prepare_params($params);
      $this->host = isset($params["host"]) ? $params["host"] : $default_params["host"];
      $this->base = isset($params["base"]) ? $params["base"] : $default_params["base"];
      $this->user = isset($params["user"]) ? $params["user"] : $default_params["user"];
      $this->password = isset($params["password"]) ? $params["password"] : $default_params["password"];
      $this->EXTENTION_OK = $this->validate_extention();
    }

    public function name(){
      return "";
    }

    public function default_params(){
      return array(
        "host" => "",
        "base" => "",
        "user" => "",
        "password" => ""
      );
    }

    public function prepare_params($params){
      return $params;
    }

    public function validate_extention(){
      return false;
    }

    public function authentication_required(){
      return false;
    }

    public function get_link(){
      return $this->link;
    }

    public function extention_ok(){
      return $this->EXTENTION_OK;
    }

    public function replace_prefixes($content){
      return (
        ($prefix_codes = array_keys($this->env->bdd("table_prefix"))) ?
          str_replace($prefix_codes, array_values($this->env->bdd("table_prefix")), $content)
        : $content
      );
    }

  }