<?php

declare(strict_types=1);

namespace App\Tests\Form\Service;

use App\BusProNet\Constants;
use App\BusProNet\Model\Service;
use App\BusProNet\Model\Travel;
use App\Form\Model\BookingDto;
use App\Form\Model\ParticipantDto;
use App\Form\Service\ParticipantVegFieldHandler;
use PHPUnit\Framework\TestCase;

class ParticipantVegFieldHandlerTest extends TestCase
{
    private ParticipantVegFieldHandler $handler;

    protected function setUp(): void
    {
        $this->handler = new ParticipantVegFieldHandler();
    }

    public function testGetFieldName(): void
    {
        $this->assertEquals('veg', $this->handler->getFieldName());
    }

    public function testGetDependencies(): void
    {
        $dependencies = $this->handler->getDependencies();

        $this->assertEquals(['dateOfBirth'], $dependencies);
    }

    public function testShouldProcessAlwaysReturnsTrue(): void
    {
        // Should always process to handle deselection cases
        $this->assertTrue($this->handler->shouldProcess([], BookingDto::MODE_CREATE, 0));
        $this->assertTrue($this->handler->shouldProcess([], BookingDto::MODE_EDIT, 0));
        $this->assertTrue($this->handler->shouldProcess(['veg' => '123'], BookingDto::MODE_CREATE, 0));
    }

    public function testProcessFieldDoesNothingWhenNoParticipant(): void
    {
        $bookingDto = $this->createMockBookingDto();
        $bookingDto->method('getParticipants')->willReturn([]);

        $this->handler->processField(['veg' => '123'], $bookingDto, 0);

        // No assertions needed - just ensure no exceptions are thrown
        $this->addToAssertionCount(1);
    }

    public function testProcessFieldClearsVegWhenNullSelection(): void
    {
        $participant = new ParticipantDto();
        $participant->veg = $this->createService(123);

        $travel = $this->createMockTravel([]);
        $bookingDto = $this->createMockBookingDto($travel);
        $bookingDto->method('getParticipants')->willReturn([$participant]);

        $this->handler->processField(['veg' => null], $bookingDto, 0);

        $this->assertNull($participant->veg);
    }

    public function testProcessFieldClearsVegWhenEmptyStringSelection(): void
    {
        $participant = new ParticipantDto();
        $participant->veg = $this->createService(123);

        $travel = $this->createMockTravel([]);
        $bookingDto = $this->createMockBookingDto($travel);
        $bookingDto->method('getParticipants')->willReturn([$participant]);

        $this->handler->processField(['veg' => ''], $bookingDto, 0);

        $this->assertNull($participant->veg);
    }

    public function testProcessFieldClearsVegWhenMissingFromData(): void
    {
        $participant = new ParticipantDto();
        $participant->veg = $this->createService(123);

        $travel = $this->createMockTravel([]);
        $bookingDto = $this->createMockBookingDto($travel);
        $bookingDto->method('getParticipants')->willReturn([$participant]);

        $this->handler->processField([], $bookingDto, 0);

        $this->assertNull($participant->veg);
    }

    public function testProcessFieldClearsVegWhenNotFoundInAvailableServices(): void
    {
        $participant = new ParticipantDto();
        $otherService = $this->createService(456);

        $travel = $this->createMockTravel([$otherService]);
        $bookingDto = $this->createMockBookingDto($travel);
        $bookingDto->method('getParticipants')->willReturn([$participant]);

        $this->handler->processField(['veg' => '123'], $bookingDto, 0);

        $this->assertNull($participant->veg);
    }

    public function testProcessFieldSetsVegWhenAvailable(): void
    {
        $vegService = $this->createService(123);
        $participant = new ParticipantDto();

        $travel = $this->createMockTravel([$vegService]);
        $bookingDto = $this->createMockBookingDto($travel);
        $bookingDto->method('getParticipants')->willReturn([$participant]);

        $this->handler->processField(['veg' => '123'], $bookingDto, 0);

        $this->assertSame($vegService, $participant->veg);
    }

    public function testProcessFieldWorksWithStringAndIntegerIds(): void
    {
        $vegService = $this->createService(123); // Integer ID
        $participant = new ParticipantDto();

        $travel = $this->createMockTravel([$vegService]);
        $bookingDto = $this->createMockBookingDto($travel);
        $bookingDto->method('getParticipants')->willReturn([$participant]);

        $this->handler->processField(['veg' => '123'], $bookingDto, 0); // String selection

        $this->assertSame($vegService, $participant->veg);
    }

    public function testProcessFieldHandlesEmptyServicesArray(): void
    {
        $participant = new ParticipantDto();

        $travel = $this->createMockTravel([]);
        $bookingDto = $this->createMockBookingDto($travel);
        $bookingDto->method('getParticipants')->willReturn([$participant]);

        $this->handler->processField(['veg' => '123'], $bookingDto, 0);

        $this->assertNull($participant->veg);
    }

    public function testProcessFieldSelectsFromMultipleVegOptions(): void
    {
        $vegetarian = $this->createService(1, 'Vegetarisch');
        $vegan = $this->createService(2, 'Vegan');
        $participant = new ParticipantDto();

        $travel = $this->createMockTravel([$vegetarian, $vegan]);
        $bookingDto = $this->createMockBookingDto($travel);
        $bookingDto->method('getParticipants')->willReturn([$participant]);

        $this->handler->processField(['veg' => '2'], $bookingDto, 0);

        $this->assertSame($vegan, $participant->veg);
    }

    public function testGetFieldStateModificationsReturnsEmptyArray(): void
    {
        $bookingDto = $this->createMockBookingDto();

        $result = $this->handler->getFieldStateModifications([], $bookingDto, 0);

        $this->assertIsArray($result);
        $this->assertEmpty($result);
    }

    public function testGetAffectedFieldNamesReturnsEmptyArray(): void
    {
        $result = $this->handler->getAffectedFieldNames();

        $this->assertIsArray($result);
        $this->assertEmpty($result);
    }

    private function createService(int $id, string $label = 'Test Service'): Service
    {
        $service = new Service();
        $service->id = $id;
        $service->label = $label;
        $service->subType = Constants::TOKEN_VEG;

        return $service;
    }

    private function createMockTravel(array $vegServices): Travel
    {
        $travel = $this->createMock(Travel::class);
        $travel->method('getAdditionalServicesBySubTypes')
            ->with(Constants::TOKEN_VEG, true)
            ->willReturn($vegServices);

        return $travel;
    }

    private function createMockBookingDto(?Travel $travel = null): BookingDto
    {
        $bookingDto = $this->createStub(BookingDto::class);

        if (null !== $travel) {
            $bookingDto->travel = $travel;
        }

        return $bookingDto;
    }
}