<?php

/**
 * Holds tests for ResultWrapper MediaWiki class.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\ResultWrapper;

/**
 * @group Database
 * @covers \Wikimedia\Rdbms\ResultWrapper
 */
class ResultWrapperTest extends PHPUnit\Framework\TestCase {
	/**
	 * @return IDatabase
	 * @param array[] $rows
	 */
	private function getDatabaseMock( array $rows ) {
		$db = $this->getMockBuilder( IDatabase::class )
			->disableOriginalConstructor()
			->getMock();
		$db->method( 'select' )->willReturnCallback(
			function () use ( $db, $rows ) {
				return new ResultWrapper( $db, $rows );
			}
		);
		$db->method( 'dataSeek' )->willReturnCallback(
			function ( ResultWrapper $res, $pos ) use ( $db ) {
				// Position already set in ResultWrapper
			}
		);
		$db->method( 'fetchRow' )->willReturnCallback(
			function ( ResultWrapper $res ) use ( $db ) {
				$row = $res::unwrap( $res )[$res->key()] ?? false;

				return $row;
			}
		);
		$db->method( 'fetchObject' )->willReturnCallback(
			function ( ResultWrapper $res ) use ( $db ) {
				$row = $res::unwrap( $res )[$res->key()] ?? false;

				return $row ? (object)$row : false;
			}
		);
		$db->method( 'numRows' )->willReturnCallback(
			function ( ResultWrapper $res ) use ( $db ) {
				return count( $res::unwrap( $res ) );
			}
		);

		return $db;
	}

	public function testIteration() {
		$db = $this->getDatabaseMock( [
			[ 'colA' => 1, 'colB' => 'a' ],
			[ 'colA' => 2, 'colB' => 'b' ],
			[ 'colA' => 3, 'colB' => 'c' ],
			[ 'colA' => 4, 'colB' => 'd' ],
			[ 'colA' => 5, 'colB' => 'e' ],
			[ 'colA' => 6, 'colB' => 'f' ],
			[ 'colA' => 7, 'colB' => 'g' ],
			[ 'colA' => 8, 'colB' => 'h' ]
		] );

		$expectedRows = [
			0 => (object)[ 'colA' => 1, 'colB' => 'a' ],
			1 => (object)[ 'colA' => 2, 'colB' => 'b' ],
			2 => (object)[ 'colA' => 3, 'colB' => 'c' ],
			3 => (object)[ 'colA' => 4, 'colB' => 'd' ],
			4 => (object)[ 'colA' => 5, 'colB' => 'e' ],
			5 => (object)[ 'colA' => 6, 'colB' => 'f' ],
			6 => (object)[ 'colA' => 7, 'colB' => 'g' ],
			7 => (object)[ 'colA' => 8, 'colB' => 'h' ]
		];

		$res = $db->select( 'faketable', [ 'colA', 'colB' ], '1 = 1', __METHOD__ );
		$this->assertEquals( 8, $res->numRows() );

		$res->seek( 7 );
		$this->assertEquals( [ 'colA' => 8, 'colB' => 'h' ], $res->fetchRow() );
		$res->seek( 7 );
		$this->assertEquals( (object)[ 'colA' => 8, 'colB' => 'h' ], $res->fetchObject() );

		$this->assertEquals( $expectedRows, iterator_to_array( $res, true ) );

		$rows = [];
		foreach ( $res as $i => $row ) {
			$rows[$i] = $row;
		}
		$this->assertEquals( $expectedRows, $rows );
	}
}