<?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;

use OCP\IDBConnection;

use PHPUnit\Framework\TestCase;
/**
 * Simple utility class for testing mappers
 */
abstract class MapperTestUtility extends TestCase
{
    protected $db;
    private $query;
    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(IDBConnection::class)
            ->disableOriginalConstructor()
            ->getMock();

        $this->query = $this->createMock(\PDOStatement::class);
        $this->queryAt = 0;
        $this->prepareAt = 0;
        $this->iterators = [];
        $this->fetchAt = 0;
    }

    /**
     * Checks if an array is associative
     *
     * @param  array $array
     * @return bool true if associative
     */
    private function isAssocArray(array $array) 
    {
        return array_values($array) !== $array;
    }

    /**
     * Returns the correct PDO constant based on the value type
     *
     * @param  $value
     * @return PDO constant
     */
    private function getPDOType($value) 
    {
        switch (gettype($value)) {
        case 'integer':
            return \PDO::PARAM_INT;
        case 'boolean':
            return \PDO::PARAM_BOOL;
        default:
            return \PDO::PARAM_STR;
        }
    }

    /**
     * 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=array(), $returnRows=array(),
        $limit=null, $offset=null, $expectClose=false
    ) {
        if($limit === null && $offset === null) {
            $this->db->expects($this->at($this->prepareAt))
                ->method('prepare')
                ->with($this->equalTo($sql))
                ->will(($this->returnValue($this->query)));
        } elseif($limit !== null && $offset === null) {
            $this->db->expects($this->at($this->prepareAt))
                ->method('prepare')
                ->with($this->equalTo($sql), $this->equalTo($limit))
                ->will(($this->returnValue($this->query)));
        } elseif($limit === null && $offset !== null) {
            $this->db->expects($this->at($this->prepareAt))
                ->method('prepare')
                ->with(
                    $this->equalTo($sql),
                    $this->equalTo(null),
                    $this->equalTo($offset)
                )
                ->will(($this->returnValue($this->query)));
        } else  {
            $this->db->expects($this->at($this->prepareAt))
                ->method('prepare')
                ->with(
                    $this->equalTo($sql),
                    $this->equalTo($limit),
                    $this->equalTo($offset)
                )
                ->will(($this->returnValue($this->query)));
        }

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

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

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

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

                        $this->queryAt++;

                        return $result;
                    }
                )
            );

        if ($this->isAssocArray($arguments)) {
            foreach($arguments as $key => $argument) {
                $pdoConstant = $this->getPDOType($argument);
                $this->query->expects($this->at($this->queryAt))
                    ->method('bindValue')
                    ->with(
                        $this->equalTo($key),
                        $this->equalTo($argument),
                        $this->equalTo($pdoConstant)
                    );
                $this->queryAt++;
            }
        } else {
            $index = 1;
            foreach($arguments as $argument) {
                $pdoConstant = $this->getPDOType($argument);
                $this->query->expects($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')
            ->will(
                $this->returnCallback(
                    function ($sql, $p=null, $o=null, $s=null) {

                    }
                )
            );
        $this->queryAt++;


        if ($expectClose) {
            $closing = $this->at($this->queryAt);
        } else {
            $closing = $this->any();
        }
        $this->query->expects($closing)->method('closeCursor');
        $this->queryAt++;

        $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;
        }
    }
}