<?php

/**
 * Класс модели данных
 *
 * @copyright NetMonsters <team@netmonsters.ru>
 * @link http://netmonsters.ru
 * @package Majestic
 * @subpackage Model
 * @since 2010-02-16
 * @version SVN: $Id$
 * @filesource $URL$
 */

abstract class Model
{

    /**
     * DbDriver instance
     *
     * @var DbDriver
     */
    protected $db;

    protected $cache;

    protected $table;

    protected $connection = 'default';

    protected $key = 'id';

    public function __construct()
    {
        $this->db = Db::connect($this->connection);
    }

    /**
     * @return int
     */
    public function getInsertId()
    {
        return $this->db->getInsertId($this->table(false), $this->key);
    }

    /**
     * @param string $ident
     * @return string Quoted identifier.
     */
    public function identify($ident)
    {
        return $this->db->quoteIdentifier($ident);
    }

    /**
     * @param mixed $value
     * @return string Quoted value.
     */
    public function quote($value)
    {
        return $this->db->quote($value);
    }

    /**
     * @param int $id
     * @return object
     */
    public function get($id)
    {
        $sql = 'SELECT * FROM ' . $this->table() . ' WHERE ' . $this->identify($this->key) . '=' . (int) $id;
        return $this->db->query($sql)->fetch();
    }

    /**
     * @param array $data
     * @return int Affect row or id of inserted field.
     */
    public function save($data)
    {
        $key = isset($data[$this->key]) ? $data[$this->key] : false;
        $result = false;
        if ($key) {
            unset($data[$this->key]);
            $result = $this->update($data, $this->identify($this->key) . '=' . (int) $id);
        } else {
            $result = $this->insert($data);
        }
        return $result;
    }

    /**
     * @param array $data
     * @return int Id of inserted row
     */
    public function insert($data)
    {
        if (!$this->db->insert($this->table(false), $data)) {
            return false;
        }
        return $this->getInsertId();
    }

    /**
     * @param array $data
     * @param mixed $where
     * @return int Number of affected rows
     */
    public function update($data, $where)
    {
        return $this->db->update($this->table(false), $data, $where);
    }

    /**
     * @param mixed $where
     * @return int Number of affected rows
     */
    public function delete($where)
    {
        if (is_int($where)) {
            $where = $this->identify($this->key) . '=' . (int) $where;
        }
        return $this->db->delete($this->table(false), $where);
    }

    /**
     * @param bool $autoescape
     * @return string
     */
    public function table($autoescape = true)
    {
        if (!$this->table) {
            $this->table = substr(strtolower(get_class($this)), 0, -5/*strlen('Model')*/);
        }
        return $autoescape ? $this->identify($this->table) : $this->table;
    }
}