<?php
/**
 * Copyright 2026 Kacper Donat
 *
 * @author Kacper "Kadet" Donat <kacper@kadet.net>
 *
 * Full license available in separate LICENSE file
 */

use Kadet\Functional\Collections as c;
use Kadet\Functional\Exception\DsUnavailableException;

/**
 * Runs without php-ds, see phpunit.no-ds.xml.
 */
class NoDsTest extends \PHPUnit\Framework\TestCase
{
    public function testDsIsHidden()
    {
        $this->assertFalse(class_exists(\Ds\Seq::class));
    }

    public function testTransformsOnArraysWork()
    {
        $this->assertSame(['a' => 2, 'b' => 4], c\map(fn ($v) => $v * 2)(['a' => 1, 'b' => 2]));
        $this->assertSame(['b' => 2], c\filter(fn ($v) => $v > 1)(['a' => 1, 'b' => 2]));
        $this->assertSame([1, 2], c\values()(['a' => 1, 'b' => 2]));
        $this->assertSame([1, 1, 2, 2], c\flatMap(fn ($v) => [$v, $v])([1, 2]));
    }

    public function testEagerTransformOnGeneratorGivesList()
    {
        $gen = static function () {
            yield 'a' => 1;
            yield 'b' => 2;
        };

        $this->assertSame([1, 2], c\map(fn ($v) => $v)($gen()));
        $this->assertSame([2], c\filter(fn ($v) => $v > 1)($gen()));
        $this->assertSame([1, 2], c\values()($gen()));
        $this->assertSame([1, 1, 2, 2], c\flatMap(fn ($v) => [$v, $v])($gen()));
    }

    public function testToSeqThrowsNamedException()
    {
        $this->expectException(DsUnavailableException::class);
        $this->expectExceptionMessage('toSeq() needs php-ds: install ext-ds or require php-ds/php-ds');

        c\toSeq();
    }

    public function testGroupByThrows()
    {
        $this->expectException(DsUnavailableException::class);
        $this->expectExceptionMessage('groupBy()');

        c\groupBy(fn ($v) => $v);
    }

    public function testOtherDsCollectorsThrow()
    {
        foreach (['toMap' => fn () => c\toMap(), 'toSet' => fn () => c\toSet(), 'keyBy' => fn () => c\keyBy(fn ($v) => $v)] as $name => $build) {
            try {
                $build();
                $this->fail("$name() should throw");
            } catch (DsUnavailableException $e) {
                $this->assertStringContainsString("$name()", $e->getMessage());
            }
        }
    }

    public function testToArrayWorks()
    {
        $this->assertSame(['a' => 1], c\toArray()(['a' => 1]));
    }
}