<?php

  class mw_env_models extends mw_env{

    public function get_model($model_name, $default_values = array(), $RETURN_INSERT_ID = false){
      $model_class_name = "mw_model_".$model_name;
      if(!class_exists($model_class_name)){
        if($this->app_file_exists("data/models/".$model_name.".php")){
          require_once $this->app_file("data/models/".$model_name.".php");
          if(!class_exists($model_class_name)) $model_class_name = "mw_model";
        }
        else $model_class_name = "mw_model";
      }
      $model = new $model_class_name($this->root_inst, $model_name, $default_values, $RETURN_INSERT_ID);
      return $model;
    }

  }

  // -------------------------------------------------------------------------------------------
  //                                                                              class mw_model
  //

  class mw_model{

    public $env;
    public $model_name;
    public $attributs;
    public $RETURN_INSERT_ID;

    public function __construct(&$env, $model_name, $default_values = array(), $RETURN_INSERT_ID = false){
      $this->env = &$env;
      $this->model_name = $model_name;
      $this->attributs = array();
      $this->RETURN_INSERT_ID = $RETURN_INSERT_ID;
      foreach($default_values as $attribut_name => $attribut_value){
        $set_function = "set_".$attribut_name;
        $this->$set_function($attribut_value);
      }
    }

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

    public function get_values(){
      $values = array();
      foreach($this->attributs as $attribut_name => $attribut){
        $values[$attribut_name] = isset($attribut["value"]) ? $attribut["value"] : null;
      }
      return $values;
    }

    public function load($index_name, $index_value){
      if(!isset($this->model_name)) return false;
      $data = $this->env->data();
      if(
        (
          $values = $data->data_read(
            array(
              "table_name" => $this->model_name,
              "index_name" => $index_name,
              "index_value" => $index_value
            )
          )
        ) === false
      ) return false;
      foreach($values as $key => $value){
        if(!isset($this->attributs[$key])) $this->attributs[$key] = array();
        $this->attributs[$key]["value"] = $value;
      }
      return true;
    }

    public function insert(){
      if(!isset($this->model_name)) return false;
      $data = $this->env->data();
      return $data->data_insert(
        array(
          "table_name" => $this->model_name,
          "values" => $this->get_values(),
          "return_insert_id" => $this->RETURN_INSERT_ID
        )
      );
    }

    public function update($index_name, $index_value = null){
      if(!isset($this->model_name)) return false;
      $data = $this->env->data();
      if(!isset($index_value)){
        $get_function = "get_".$index_name;
        $index_value = $this->$get_function();
      }
      if(!isset($index_value) || !$index_value) return false;
      return $data->data_update(
        array(
          "table_name" => $this->model_name,
          "index_name" => $index_name,
          "index_value" => $index_value,
          "values" => $this->get_values()
        )
      );
    }

    public function delete($index_name, $index_value = null){
      if(!isset($this->model_name)) return false;
      $data = $this->env->data();
      if(!isset($index_value)){
        $get_function = "get_".$index_name;
        $index_value = $this->$get_function();
      }
      if(!isset($index_value) || !$index_value) return false;
      return $data->data_delete(
        array(
          "table_name" => $this->model_name,
          "index_name" => $index_name,
          "index_value" => $index_value
        )
      );
    }

    public function valid(){
      $res = array(
        "VALID" => true,
        "messages" => array()
      );
      foreach($this->attributs as $attribut_name => $attribut){
        $get_function = "get_".$attribut_name;
        $valid_function = "valid_".$attribut_name;
        if(($r = $this->$valid_function($this->$get_function())) !== true){
          $res["VALID"] = false;
          $res["messages"][] = $r;
        }
      }
      return $res;
    }

    public function __call($method_name, $arguments){
      $r = false;
      if(substr($method_name, 0, 4) == "get_"){
        if(
              ($attribut_name = substr($method_name, 4))
        ){
          if(isset($this->attributs[$attribut_name]["value"])){
            $r = $this->attributs[$attribut_name]["value"];
          }
          else $r = null;
        }
      }
      elseif(substr($method_name, 0, 4) == "set_"){
        if(
              ($attribut_name = substr($method_name, 4))
          &&  isset($arguments[0])
        ){
          if(!isset($this->attributs[$attribut_name])) $this->attributs[$attribut_name] = array();
          $this->attributs[$attribut_name]["value"] = $arguments[0];
          $r = true;
        }
      }
      elseif(substr($method_name, 0, 6) == "valid_"){
        if(
              ($attribut_name = substr($method_name, 6))
          &&  isset($arguments[0])
        ){
          $r = true;
        }
      }
      return $r;
    }

  }