<?
/** -------------------------------------------------------------------------------------*
* Version: 1.0                                                                           *
* License: http://phpwebpad.hafij.com @copyright from 2010                               *
* ---------------------------------------------------------------------------------------*
* DEVELOPED BY                                                                           *
* Mohammad Hafijur Rahman (Badal)                                                        *
* hide@address.com, hide@address.com                                             *
* ------------------------------------------------------------------------------------ **/

/**
* Any model class must extedn this Model class.
*/
abstract class Model {
  private $tableDefinition = null;
  private $info = array();

  /**
  * construct the model and call the table definition to be loaded.
  */
  public function  __construct() {
    $this->tableDefinition = $this->getTableDefinition();
    $this->loadTableDefinition();
  }
  /**
  * Abstruct function must be implement by the child class.
  */
  abstract function getTableDefinition();

  /**
  * Load the table definition to creat or alter the table automatically
  */
  private function loadTableDefinition() {
    $table = $this->tableDefinition;
    if($table == null)
      throw new Exception('Can not load table definition.');
    
    if(Database::getCreateTableMode())
      Database::createTable($table);
  }

  /**
  * Magic __get return a property value
  * @param string $name
  * @return mixed
  */
  public function __get($name) {
    $pk = $this->tableDefinition->getPrimaryKeyName();
    if($pk == $name) {
      if(isset($this->info[$name]))
        return $this->info[$name];

      return null;
    }

    $value = null;
    $flag = true;
    foreach($this->info as $key => $val) {
      if($key == $name) {
        $value = $val;
        $flag = false;
        break;
      }
    }
    
    if($flag)
      throw new Exception(get_class($this)." does not have property ".$name);
    
    return $value;
  }

  /**
  * Magic __set. Set a property value.
  * @param string $name
  * @param mixed $value
  */
  public function __set($name, $value) {
    $pk = $this->tableDefinition->getPrimaryKeyName();
    if($pk == $name) {
      throw new Exception('Primary key can not be set from property.');
    }
    
    $columns = $this->tableDefinition->getColumns();
    $flag = true;
    foreach($columns as $c) {
      if($c['name'] == $name) {
        $this->info[$name] = $value;
        $flag = false;
        break;
      }
    }

    if($flag)
      throw new Exception(get_class($this)." does not have property ".$name);
  }

  /**
  * Only Database will use this function.
  * Never try from anywhere else. I said never.
  */
  public function setPrimaryKey($value) {
    if(empty($value))
      throw new Exception('Primary key value can not be empty');

    $this->info[$this->tableDefinition->getPrimaryKeyName()] = $value;
  }

  /**
  * Retrun all the property of the model object.
  * @return array
  */
  public function getAllProperties() {
    return $this->info;
  }
}
?>