<?php

declare(strict_types=1);

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

use App\Logic\Common\ClockInterface;
use App\Logic\Common\EventDispatcherInterface;
use App\Logic\Common\TransactionManagerInterface;
use App\Logic\Essen\Dto\MahlzeitUpdateRequest;
use App\Logic\Essen\Dto\MahlzeitUpdateResponse;
use App\Logic\Essen\Event\MahlzeitUpdatedEvent;
use App\Logic\Essen\Exception\MahlzeitNotFoundException;
use App\Logic\Essen\Manager\MahlzeitManagerInterface;
use App\Logic\Essen\Mapping\MahlzeitFactory;
use App\Logic\Essen\Model\Mahlzeit;
use App\Logic\Essen\Model\MahlzeitStatus;
use App\Logic\Essen\Model\Wochentag;
use App\Logic\Essen\UseCase\MahlzeitUpdateUseCase;
use PHPUnit\Framework\TestCase;

final class MahlzeitUpdateUseCaseTest extends TestCase
{
    private function jetzt(): \DateTimeImmutable
    {
        return new \DateTimeImmutable('2026-09-18 12:00:00');
    }

    /** Stub: ruft den übergebenen Closure einfach aus (simuliert die Transaktion). */
    private function tx(): TransactionManagerInterface
    {
        $tx = $this->createStub(TransactionManagerInterface::class);
        $tx->method('execute')->willReturnCallback(static fn (\Closure $work): mixed => $work($work));
        return $tx;
    }

    private function clock(): ClockInterface
    {
        $clock = $this->createStub(ClockInterface::class);
        $clock->method('now')->willReturn($this->jetzt());
        return $clock;
    }

    private function bestehend(): Mahlzeit
    {
        $jetzt = $this->jetzt();
        return new Mahlzeit(5, 'Altes', 'alte Notiz', [Wochentag::Mo, Wochentag::Di], 3, MahlzeitStatus::Geplant, $jetzt, $jetzt, null);
    }

    public function testExecuteAktualisiertNameNotizUndWochentage(): void
    {
        $erfasstesModell = null;
        $manager = $this->createMock(MahlzeitManagerInterface::class);
        $manager->expects(self::once())->method('find')->with(5)->willReturn($this->bestehend());
        $manager->expects(self::once())
            ->method('update')
            ->willReturnCallback(function (Mahlzeit $m) use (&$erfasstesModell) {
                $erfasstesModell = $m;
                return $m;
            });

        $events = $this->createMock(EventDispatcherInterface::class);
        $events->expects(self::once())
            ->method('dispatch')
            ->with(self::equalTo(new MahlzeitUpdatedEvent(id: 5, name: 'Neues')));

        $useCase = new MahlzeitUpdateUseCase($this->tx(), $manager, new MahlzeitFactory(), $events, $this->clock());

        $response = $useCase->execute(5, new MahlzeitUpdateRequest(name: 'Neues', notiz: 'neu', wochentage: [Wochentag::Fr]));

        self::assertSame('Neues', $erfasstesModell->name);
        self::assertSame('neu', $erfasstesModell->notiz);
        self::assertSame([Wochentag::Fr], $erfasstesModell->wochentage());
        self::assertInstanceOf(MahlzeitUpdateResponse::class, $response);
        self::assertSame(5, $response->id);
        self::assertSame('Neues', $response->mahlzeit->name);
    }

    public function testExecuteLässtUndefinierteFelderUnerändert(): void
    {
        $alt = $this->bestehend();
        $erfasstesModell = null;

        $manager = $this->createMock(MahlzeitManagerInterface::class);
        $manager->expects(self::once())->method('find')->with(5)->willReturn($alt);
        $manager->expects(self::once())
            ->method('update')
            ->willReturnCallback(function (Mahlzeit $m) use (&$erfasstesModell) {
                $erfasstesModell = $m;
                return $m;
            });

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

        $useCase = new MahlzeitUpdateUseCase($this->tx(), $manager, new MahlzeitFactory(), $events, $this->clock());

        $useCase->execute(5, new MahlzeitUpdateRequest(name: null, notiz: null, wochentage: null));

        self::assertSame('Altes', $erfasstesModell->name, 'nicht geliefertes Feld bleibt unverändert');
        self::assertSame('alte Notiz', $erfasstesModell->notiz);
        self::assertSame([Wochentag::Mo, Wochentag::Di], $erfasstesModell->wochentage());
    }

    public function testExecuteLeertWochentageMitEmptyArray(): void
    {
        $erfasstesModell = null;

        $manager = $this->createMock(MahlzeitManagerInterface::class);
        $manager->expects(self::once())->method('find')->with(5)->willReturn($this->bestehend());
        $manager->expects(self::once())
            ->method('update')
            ->willReturnCallback(function (Mahlzeit $m) use (&$erfasstesModell) {
                $erfasstesModell = $m;
                return $m;
            });

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

        $useCase = new MahlzeitUpdateUseCase($this->tx(), $manager, new MahlzeitFactory(), $events, $this->clock());

        $useCase->execute(5, new MahlzeitUpdateRequest(wochentage: []));

        self::assertSame([], $erfasstesModell->wochentage());
    }

    public function testExecuteWirft404WennNichtVorhanden(): void
    {
        $manager = $this->createStub(MahlzeitManagerInterface::class);
        $manager->method('find')->willThrowException(new MahlzeitNotFoundException(99));

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

        $useCase = new MahlzeitUpdateUseCase($this->tx(), $manager, new MahlzeitFactory(), $events, $this->clock());

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

        try {
            $useCase->execute(99, new MahlzeitUpdateRequest(name: 'X'));
        } finally {
            // Erwartete Exception oben.
        }
    }
}