<?php

/**
 * ownCloud - App Framework
 *
 * @author Bernhard Posselt
 * @copyright 2012 Bernhard Posselt dev@bernhard-posselt.com
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


namespace OCA\News\Tests\Unit\Db;


/**
 * Simple utility class for testing mappers
 */
abstract class MapperTestUtility extends \PHPUnit_Framework_TestCase {
    protected $db;
    private $query;
    private $pdoResult;
    private $queryAt;
    private $prepareAt;
    private $fetchAt;
    private $iterators;


    /**
     * Run this function before the actual test to either set or initialize the
     * db. After this the db can be accessed by using $this->db
     */
    protected function setUp(){
        parent::setUp();

        $this->db = $this->getMockBuilder(
            '\OCP\IDb')
            ->disableOriginalConstructor()
            ->getMock();

        $this->query = $this->getMock('Query', array('execute', 'bindValue'));
        $this->pdoResult = $this->getMock('Result', array('fetch', 'closeCursor'));
        $this->queryAt = 0;
        $this->prepareAt = 0;
        $this->iterators = array();
        $this->fetchAt = 0;
    }


    /**
     * Create mocks and set expected results for database queries
     * @param string $sql the sql query that you expect to receive
     * @param array $arguments the expected arguments for the prepare query
     * method
     * @param array $returnRows the rows that should be returned for the result
     * of the database query. If not provided, it wont be assumed that fetch
     * will be called on the result
     */
    protected function setMapperResult($sql, $arguments=[], $returnRows=[],
        $limit=null, $offset=null, $expectClose=false){

        $this->iterators[] = new ArgumentIterator($returnRows);

        $iterators = $this->iterators;
        $fetchAt = $this->fetchAt;

        $this->pdoResult->expects($this->any())
            ->method('fetch')
            ->will($this->returnCallback(
                function() use ($iterators, $fetchAt){
                    $iterator = $iterators[$fetchAt];
                    $result = $iterator->next();

                    if($result === false) {
                        $fetchAt++;
                    }

                    return $result;
                }
            ));
        if ($expectClose) {
            $closing = $this->once();
        } else {
            $closing = $this->any();
        }
        $this->pdoResult->expects($closing)
            ->method('closeCursor');

        $index = 1;
        foreach($arguments as $argument) {
            switch (gettype($argument)) {
                case 'integer':
                    $pdoConstant = \PDO::PARAM_INT;
                    break;

                case 'NULL':
                    $pdoConstant = \PDO::PARAM_NULL;
                    break;

                case 'boolean':
                    $pdoConstant = \PDO::PARAM_BOOL;
                    break;

                default:
                    $pdoConstant = \PDO::PARAM_STR;
                    break;
            }
            $this->query->expects($this->at($this->queryAt))
                ->method('bindValue')
                ->with($this->equalTo($index),
                    $this->equalTo($argument),
                    $this->equalTo($pdoConstant));
            $index++;
            $this->queryAt++;
        }

        $this->query->expects($this->at($this->queryAt))
            ->method('execute')
            ->with()
            ->will($this->returnValue($this->pdoResult));
        $this->queryAt++;

        if($limit === null && $offset === null) {
            $this->db->expects($this->at($this->prepareAt))
                ->method('prepareQuery')
                ->with($this->equalTo($sql),
                        $this->equalTo(null),
                        $this->equalTo(null))
                ->will(($this->returnValue($this->query)));
        } elseif($limit !== null && $offset === null) {
            $this->db->expects($this->at($this->prepareAt))
                ->method('prepareQuery')
                ->with($this->equalTo($sql),
                        $this->equalTo($limit),
                        $this->equalTo(null))
                ->will(($this->returnValue($this->query)));
        } elseif($limit === null && $offset !== null) {
            $this->db->expects($this->at($this->prepareAt))
                ->method('prepareQuery')
                ->with($this->equalTo($sql),
                    $this->equalTo(null),
                    $this->equalTo($offset))
                ->will(($this->returnValue($this->query)));
        } else  {
            $this->db->expects($this->at($this->prepareAt))
                ->method('prepareQuery')
                ->with($this->equalTo($sql),
                    $this->equalTo($limit),
                    $this->equalTo($offset))
                ->will(($this->returnValue($this->query)));
        }
        $this->prepareAt++;
        $this->fetchAt++;

    }


}


class ArgumentIterator {

    private $arguments;

    public function __construct($arguments){
        $this->arguments = $arguments;
    }

    public function next(){
        $result = array_shift($this->arguments);
        if($result === null){
            return false;
        } else {
            return $result;
        }
    }
}