<?php
/**
 * Matomo - free/libre analytics platform
 *
 * @link https://matomo.org
 * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 */

namespace Piwik\Tests\Unit;

use Piwik\RankingQuery;

class RankingQueryTest extends \PHPUnit\Framework\TestCase
{
    /**
     * @group Core
     */
    public function testBasic()
    {
        $query = new RankingQuery();
        $query->setOthersLabel('Others');
        $query->addLabelColumn('label');
        $query->addColumn('column');
        $query->addColumn('columnSum', 'sum');
        $query->setLimit(10);

        $innerQuery = "SELECT label, column, columnSum FROM myTable";

        $expected = "
			SELECT
				CASE
					WHEN counter = 11 THEN 'Others'
					ELSE `label`
				END AS `label`,
				`column`,
				sum(`columnSum`) AS `columnSum`
			FROM (
				SELECT
					`label`,
					CASE
						WHEN @counter = 11 THEN 11
						ELSE @counter:=@counter+1
					END AS counter,
					`column`,
					`columnSum`
				FROM
					( SELECT @counter:=0 ) initCounter,
					( SELECT label, column, columnSum FROM myTable ) actualQuery
			 ) AS withCounter
			GROUP BY counter
		";

        $this->checkQuery($query, $innerQuery, $expected);
    }

    /**
     * @group Core
     */
    public function testExcludeRows()
    {
        $query = new RankingQuery(20);
        $query->setOthersLabel('Others');
        $query->addLabelColumn('label');
        $query->setColumnToMarkExcludedRows('exclude_marker');

        $innerQuery = "SELECT label, 1 AS exclude_marker FROM myTable";

        $expected = "
			SELECT
				CASE
					WHEN counter = 21 THEN 'Others'
					ELSE `label`
				END AS `label`,
				`exclude_marker`
			FROM (
				SELECT
					`label`,
					CASE
						WHEN exclude_marker != 0 THEN -1 * exclude_marker
						WHEN @counter = 21 THEN 21
						ELSE @counter:=@counter+1
					END AS counter,
					`exclude_marker`
				FROM
					( SELECT @counter:=0 ) initCounter,
					( SELECT label, 1 AS exclude_marker FROM myTable ) actualQuery
			) AS withCounter
			GROUP BY counter
		";

        $this->checkQuery($query, $innerQuery, $expected);
    }

    /**
     * @group Core
     */
    public function testPartitionResult()
    {
        $query = new RankingQuery(1000);
        $query->setOthersLabel('Others');
        $query->addLabelColumn('label');
        $query->partitionResultIntoMultipleGroups('partition', array(1, 2, 3));

        $innerQuery = "SELECT label, partition FROM myTable";

        $expected = "
			SELECT
				CASE
					WHEN counter = 1001 THEN 'Others'
					ELSE `label`
				END AS `label`,
				`partition`
			FROM (
				SELECT
					`label`,
					CASE
						WHEN `partition` = 1 AND @counter1 = 1001 THEN 1001
						WHEN `partition` = 1 THEN @counter1:=@counter1+1
						WHEN `partition` = 2 AND @counter2 = 1001 THEN 1001
						WHEN `partition` = 2 THEN @counter2:=@counter2+1
						WHEN `partition` = 3 AND @counter3 = 1001 THEN 1001
						WHEN `partition` = 3 THEN @counter3:=@counter3+1
						ELSE 0
					END AS counter,
					`partition`
				FROM
					( SELECT @counter1:=0 ) initCounter1,
					( SELECT @counter2:=0 ) initCounter2,
					( SELECT @counter3:=0 ) initCounter3,
					( SELECT label, partition FROM myTable ) actualQuery
			) AS withCounter
			GROUP BY counter, `partition`
		";

        $this->checkQuery($query, $innerQuery, $expected);
    }

    /**
     * @param RankingQuery $rankingQuery
     * @param string $innerQuerySql
     * @param string $expected
     */
    private function checkQuery($rankingQuery, $innerQuerySql, $expected)
    {
        $query = $rankingQuery->generateRankingQuery($innerQuerySql);

        $queryNoWhitespace = preg_replace("/\s+/", "", $query);
        $expectedNoWhitespace = preg_replace("/\s+/", "", $expected);

        $message = 'Unexpected query: ' . $query;
        $this->assertEquals($queryNoWhitespace, $expectedNoWhitespace, $message);
    }
}