<?php

declare(strict_types=1);

namespace App\Tests\Unit\Logic\Essen\UseCase;

use App\Logic\Common\EventDispatcherInterface;
use App\Logic\Common\TransactionManagerInterface;
use App\Logic\Essen\Dto\MahlzeitReorderRequest;
use App\Logic\Essen\Event\MahlzeitReorderedEvent;
use App\Logic\Essen\Exception\MahlzeitNotFoundException;
use App\Logic\Essen\Manager\MahlzeitManagerInterface;
use App\Logic\Essen\Model\Mahlzeit;
use App\Logic\Essen\Model\MahlzeitStatus;
use App\Logic\Essen\UseCase\MahlzeitReorderUseCase;
use PHPUnit\Framework\TestCase;

final class MahlzeitReorderUseCaseTest extends TestCase
{
    private function tx(): TransactionManagerInterface
    {
        $tx = $this->createStub(TransactionManagerInterface::class);
        $tx->method('execute')->willReturnCallback(static fn (\Closure $work): mixed => $work());
        return $tx;
    }

    private function mahlzeit(int $id, int $sortOrder): Mahlzeit
    {
        $jetzt = new \DateTimeImmutable('2026-09-18 12:00:00');
        return new Mahlzeit($id, 'Gericht' . $id, '', [], $sortOrder, MahlzeitStatus::Geplant, $jetzt, $jetzt, null);
    }

    public function testExecuteRenommertSortOrderUndDispatchtEvent(): void
    {
        $manager = $this->createMock(MahlzeitManagerInterface::class);
        $manager->method('find')->willReturnMap([
            [2, $this->mahlzeit(2, 2)],
            [1, $this->mahlzeit(1, 1)],
            [3, $this->mahlzeit(3, 3)],
        ]);

        $gespeicherte = [];
        $manager->expects(self::exactly(2))->method('update')->willReturnCallback(function (Mahlzeit $m) use (&$gespeicherte) {
            $gespeicherte[$m->id] = $m->sortOrder;
            return $m;
        });

        $events = $this->createMock(EventDispatcherInterface::class);
        $events->expects(self::once())->method('dispatch')->with(
            self::equalTo(new MahlzeitReorderedEvent([2, 1, 3])),
        );

        $useCase = new MahlzeitReorderUseCase($this->tx(), $manager, $events);
        $useCase->execute(new MahlzeitReorderRequest([2, 1, 3]));

        // id 2 → Position 1, id 1 → Position 2; id 3 (Position 3) bleibt unverändert.
        self::assertSame([2 => 1, 1 => 2], $gespeicherte);
    }

    public function testExecuteSpruengtBereitsKorrektePosition(): void
    {
        $manager = $this->createMock(MahlzeitManagerInterface::class);
        $manager->method('find')->willReturnMap([
            [1, $this->mahlzeit(1, 1)],
            [2, $this->mahlzeit(2, 2)],
        ]);
        $manager->expects(self::never())->method('update');

        $events = $this->createMock(EventDispatcherInterface::class);
        $events->expects(self::once())->method('dispatch');

        $useCase = new MahlzeitReorderUseCase($this->tx(), $manager, $events);
        $useCase->execute(new MahlzeitReorderRequest([1, 2]));
    }

    public function testExecuteLeereListeIstNoOp(): void
    {
        $manager = $this->createMock(MahlzeitManagerInterface::class);
        $manager->expects(self::never())->method('find');
        $manager->expects(self::never())->method('update');

        $events = $this->createMock(EventDispatcherInterface::class);
        $events->expects(self::never())->method('dispatch');

        $useCase = new MahlzeitReorderUseCase($this->tx(), $manager, $events);
        $useCase->execute(new MahlzeitReorderRequest([]));
    }

    public function testExecuteUnbekannteIdWirft404(): void
    {
        $manager = $this->createStub(MahlzeitManagerInterface::class);
        $manager->method('find')->willThrowException(new MahlzeitNotFoundException(99));

        $events = $this->createMock(EventDispatcherInterface::class);
        $events->expects(self::never())->method('dispatch');

        $useCase = new MahlzeitReorderUseCase($this->tx(), $manager, $events);

        $this->expectException(MahlzeitNotFoundException::class);

        try {
            $useCase->execute(new MahlzeitReorderRequest([99]));
        } finally {
            // Erwartete Exception oben.
        }
    }
}