<?php

class Model
{

	private $_primaryKey_;
	protected $_tableName_;
	private $_id_;
	private $_vals_ = array();

	function __construct()
	{
		$this->_primaryKey_ = $this->getPk();
	}

	function __set($name, $value)
	{
		$this->_vals_[$name] = $value;
	}

	function __get($name)
	{
		return isset($this->_vals_[$name]) ? $this->_vals_[$name] : null;
	}

	private function getPk()
	{
		$res = App::$DB->query("SHOW KEYS FROM " . $this->_tableName_ . " WHERE Key_name = 'PRIMARY'")->fetch(PDO::FETCH_ASSOC);
		return $res["Column_name"];
	}

	function getByPK($id)
	{
		$this->_vals_ = App::$DB->query('SELECT * FROM ' . $this->_tableName_ . ' WHERE ' . $this->_primaryKey_ . ' = ' . $id)->fetch(PDO::FETCH_ASSOC);
        $this->_id_ = $this->_vals_[$this->_primaryKey_];
        return $this;
	}

	function getAll()
	{
		$res = App::$DB->query('SELECT * FROM ' . $this->_tableName_);

        $this->_id_ = NULL; // Это больше не конкретная запись
		$ready = array();

		while ($row = $res->fetch(PDO::FETCH_ASSOC))
		{
			$ready[$row[$this->_primaryKey_]] = $row;
		}

		return $ready;
	}

	function delete($id)
	{
		return App::$DB->query('DELETE FROM ' . $this->_tableName_ . ' WHERE ' . $this->_primaryKey_ . ' = ' . $id);
	}

	function add($values)
	{

		$request = App::$DB->prepare('INSERT INTO ' . $this->_tableName_ . ' (' . implode(',', array_keys($values)) . ') values (:' . implode(', :', array_keys($values)) . ')');
        if ( $request->execute((array) $values) )
        {
            return $this->getByPK(App::$DB->lastInsertId());
        }
        else
        {
            return false;
        }
	}

    function save()
    {
        if (!$this->_id_ || !$this->_vals_)
            return FALSE;

        $values = $this->_vals_;
        unset($values[$this->_primaryKey_]);

        $request = App::$DB->prepare('UPDATE ' . $this->_tableName_ . ' SET ' . implode('=?, ', array_keys($values)) . '=? WHERE '.$this->_primaryKey_.'='.$this->_id_);
		$res = $request->execute(array_values($values));

        return $res ? $this : FALSE;
    }

    function getValues()
    {
        return $this->_vals_;
    }

}