<?php

class App_Slide_Admin_Obj extends App_Slide_Abstract_Obj
{
    const MSG_LAST_RECORD = 'The last slide can not be removed';
    const MSG_LAST_VISIBLE_RECORD = 'The last visible slide can not be hidden';

    protected $_hasFilter = true;
    protected $_filterFields = array('Slide' => array('title'));
    protected $_fileFields = array('image', 'backgroundImage');

    public function delete()
    {
        $this->_clearErrors();
        if (1 >= $this->getListItemsCount()) {
            $this->_addError(static::MSG_LAST_RECORD);
            return false;
        }
        return parent::delete();
    }

    public function update(array $data = null)
    {
        if (null === $data) {
            $data = $this->_data;
        } else {
            $this->_data = $data;
        }
        if ($data['show'] != 'y' && !$this->_isLastVisible($this->getPrimaryKey())) {
            $this->_initWarningLastVisibility();
            return false;
        }
        return parent::update($data);
    }

    public function changeEnumOption($name)
    {
        if ($name == 'show' && $this->_data['show'] != 'n' && !$this->_isLastVisible($this->getPrimaryKey())) {
            $this->_initWarningLastVisibility();
            return false;
        }

        return parent::changeEnumOption($name);
    }

    private function _isLastVisible($id)
    {
        $select = $this->_db->select();
        $select->from($this->_tableName, new Zend_Db_Expr('1'));
        $select->where('`show` = ?', 'y');
        $select->where('`id` != ?', (int) $id, Zend_Db::INT_TYPE);
        $select->limit(1);
        return '1' === $this->_db->fetchOne($select);
    }

    private function _initWarningLastVisibility()
    {
        $this->_clearErrors();
        $this->_addError(static::MSG_LAST_VISIBLE_RECORD);
        return $this;
    }
}