<?php

namespace App\Tests\Validator;

use App\Entity\Bucket;
use App\Entity\Scenario;
use App\Enum\BucketAllocationType;
use App\Enum\BucketType;
use App\Validator\SingleOverflowPerScenario;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
use Symfony\Component\Validator\ConstraintViolationListInterface;
use Symfony\Component\Validator\Validator\ValidatorInterface;

final class SingleOverflowPerScenarioTest extends KernelTestCase
{
    private EntityManagerInterface $em;
    private ValidatorInterface $validator;

    protected function setUp(): void
    {
        self::bootKernel();
        $this->em = self::getContainer()->get(EntityManagerInterface::class);
        $this->validator = self::getContainer()->get(ValidatorInterface::class);
    }

    public function testSecondOverflowBucketOnTheSameScenarioRaisesAViolation(): void
    {
        $scenario = new Scenario();
        $scenario->setName('Household Budget');
        $this->em->persist($scenario);
        $this->em->flush();

        $existingOverflow = $this->makeBucket($scenario, BucketType::OVERFLOW, 1);
        $this->em->persist($existingOverflow);
        $this->em->flush();

        $secondOverflow = $this->makeBucket($scenario, BucketType::OVERFLOW, 2);

        $violations = $this->validator->validate($secondOverflow);

        $matching = $this->violationsAt($violations, 'type');

        self::assertNotCount(
            0,
            $matching,
            'A second OVERFLOW bucket on a scenario that already has one must raise a violation on type. '
            .'The existing overflow bucket is persisted-but-uncommitted in this test\'s DAMA transaction — '
            .'the validator\'s repository query must still see it within the same transaction.',
        );
    }

    public function testTheSoleExistingOverflowBucketValidatesWithNoSingleOverflowViolation(): void
    {
        $scenario = new Scenario();
        $scenario->setName('Household Budget');
        $this->em->persist($scenario);
        $this->em->flush();

        $overflow = $this->makeBucket($scenario, BucketType::OVERFLOW, 1);
        $this->em->persist($overflow);
        $this->em->flush();

        $violations = $this->validator->validate($overflow);

        $matching = $this->violationsAt($violations, 'type');

        self::assertCount(
            0,
            $matching,
            'The single existing OVERFLOW bucket must not raise this constraint against itself '
            .'(exclude-self-by-id must be working).',
        );
    }

    public function testFirstOverflowBucketOnAScenarioWithNoOverflowBucketsIsValid(): void
    {
        $scenario = new Scenario();
        $scenario->setName('Household Budget');
        $this->em->persist($scenario);
        $this->em->flush();

        $needBucket = $this->makeBucket($scenario, BucketType::NEED, 1);
        $this->em->persist($needBucket);
        $this->em->flush();

        $firstOverflow = $this->makeBucket($scenario, BucketType::OVERFLOW, 2);

        $violations = $this->validator->validate($firstOverflow);

        $matching = $this->violationsAt($violations, 'type');

        self::assertCount(
            0,
            $matching,
            'A brand-new, unpersisted OVERFLOW bucket on a scenario with zero existing OVERFLOW buckets '
            .'must not raise this constraint — this is the common create-the-first-overflow-bucket flow.',
        );
    }

    private function makeBucket(Scenario $scenario, BucketType $type, int $priority): Bucket
    {
        $bucket = new Bucket();
        $bucket->setScenario($scenario);
        $bucket->setType($type);
        $bucket->setName('Bucket '.$priority);
        $bucket->setPriority($priority);
        $bucket->setSortOrder($priority);
        $bucket->setAllocationType(
            BucketType::OVERFLOW === $type ? BucketAllocationType::UNLIMITED : BucketAllocationType::FIXED_LIMIT,
        );
        $bucket->setAllocationValue(BucketType::OVERFLOW === $type ? null : 50000);
        $bucket->setStartingAmount(0);
        $bucket->setBufferMultiplier('0.00');

        return $bucket;
    }

    /**
     * @return list<\Symfony\Component\Validator\ConstraintViolationInterface>
     */
    private function violationsAt(ConstraintViolationListInterface $violations, string $propertyPath): array
    {
        $matching = [];

        foreach ($violations as $violation) {
            if ($violation->getPropertyPath() === $propertyPath
                && $violation->getConstraint() instanceof SingleOverflowPerScenario
            ) {
                $matching[] = $violation;
            }
        }

        return $matching;
    }
}