<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class AllowCompetitionWinnerRankTies extends Migration
{
    public function up()
    {
        $db = \Config\Database::connect();
        if (!$db->tableExists('competition_winners')) {
            return;
        }

        if ($db->indexExists('competition_winners', 'competition_id_class_section_id_rank')) {
            $db->query('DROP INDEX competition_id_class_section_id_rank ON competition_winners');
        }

        if (!$db->indexExists('competition_winners', 'competition_id_class_section_id_rank')) {
            $db->query(
                'CREATE INDEX competition_id_class_section_id_rank ON competition_winners (competition_id, class_section_id, rank)'
            );
        }
    }

    public function down()
    {
        $db = \Config\Database::connect();
        if (!$db->tableExists('competition_winners')) {
            return;
        }

        if ($db->indexExists('competition_winners', 'competition_id_class_section_id_rank')) {
            $db->query('DROP INDEX competition_id_class_section_id_rank ON competition_winners');
        }

        $db->query(
            'ALTER TABLE competition_winners ADD UNIQUE KEY competition_id_class_section_id_rank (competition_id, class_section_id, rank)'
        );
    }
}