<?php

namespace App\Tests\Entity;

use App\Entity\Bucket;
use App\Entity\Scenario;
use App\Enum\BucketAllocationType;
use App\Enum\BucketType;
use Doctrine\DBAL\Exception\UniqueConstraintViolationException;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
use Symfony\Component\Uid\UuidV7;

final class BucketPersistenceTest extends KernelTestCase
{
    private EntityManagerInterface $em;

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

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

        $scenarioId = $scenario->getId();

        $bucket = new Bucket();
        $bucket->setScenario($scenario);
        $bucket->setType(BucketType::NEED);
        $bucket->setName('Rent');
        $bucket->setPriority(3);
        $bucket->setSortOrder(2);
        $bucket->setAllocationType(BucketAllocationType::FIXED_LIMIT);
        $bucket->setAllocationValue(150000);
        $bucket->setStartingAmount(5000);
        $bucket->setBufferMultiplier('1.50');

        $this->em->persist($bucket);
        $this->em->flush();

        $bucketId = $bucket->getId();

        $this->em->clear();

        $reloaded = $this->em->find(Bucket::class, $bucketId);

        self::assertNotNull($reloaded, 'Bucket must be retrievable from the database after an identity-map clear.');

        self::assertInstanceOf(Scenario::class, $reloaded->getScenario());
        self::assertSame(
            (string) $scenarioId,
            (string) $reloaded->getScenario()->getId(),
            'Reloaded bucket must be linked to the same scenario it was persisted with.',
        );

        self::assertInstanceOf(
            BucketType::class,
            $reloaded->getType(),
            'type must hydrate as a BucketType enum instance, not a raw string.',
        );
        self::assertSame(BucketType::NEED, $reloaded->getType());

        self::assertSame('Rent', $reloaded->getName());
        self::assertSame(3, $reloaded->getPriority());
        self::assertSame(2, $reloaded->getSortOrder());

        self::assertInstanceOf(
            BucketAllocationType::class,
            $reloaded->getAllocationType(),
            'allocation_type must hydrate as a BucketAllocationType enum instance, not a raw string.',
        );
        self::assertSame(BucketAllocationType::FIXED_LIMIT, $reloaded->getAllocationType());

        self::assertSame(
            150000,
            $reloaded->getAllocationValue(),
            'allocation_value must round-trip as an int (cents), not a string or float.',
        );
        self::assertSame(5000, $reloaded->getStartingAmount());

        self::assertSame(
            '1.50',
            $reloaded->getBufferMultiplier(),
            'buffer_multiplier is a Doctrine decimal column — it hydrates as a numeric string, not a float (precision-safe).',
        );
    }

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

        $bucket = new Bucket();
        $bucket->setScenario($scenario);
        $bucket->setType(BucketType::NEED);
        $bucket->setName('Rent');
        $bucket->setPriority(1);
        $bucket->setSortOrder(0);
        // setAllocationType() deliberately NOT called — pins the default.
        $bucket->setAllocationValue(150000);
        $bucket->setStartingAmount(5000);
        $bucket->setBufferMultiplier('0.00');

        $this->em->persist($bucket);
        $this->em->flush();

        $bucketId = $bucket->getId();

        $this->em->clear();

        $reloaded = $this->em->find(Bucket::class, $bucketId);

        self::assertNotNull($reloaded, 'Bucket must be retrievable from the database after an identity-map clear.');

        self::assertSame(
            BucketAllocationType::FIXED_LIMIT,
            $reloaded->getAllocationType(),
            'allocation_type must default to FIXED_LIMIT at the entity (PHP) level when not explicitly set. '
            .'This does not exercise the DB column default, since Doctrine always includes allocation_type '
            .'in its INSERT once the property holds a value — see testAllocationTypeDbColumnHasFixedLimitDefaultWhenOmittedFromInsert '
            .'for the DB-level proof.',
        );
    }

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

        $scenarioId = $scenario->getId();

        $bucketId = new UuidV7();
        $connection = $this->em->getConnection();

        // Raw INSERT deliberately omits allocation_type — the DB column default must supply it.
        // All other NOT NULL columns without a DB default (id, name, type, priority, scenario_id)
        // are provided explicitly.
        $connection->executeStatement(
            'INSERT INTO bucket (id, name, type, priority, scenario_id) VALUES (:id, :name, :type, :priority, :scenarioId)',
            [
                'id' => $bucketId->toRfc4122(),
                'name' => 'Rent',
                'type' => BucketType::NEED->value,
                'priority' => 1,
                'scenarioId' => $scenarioId->toRfc4122(),
            ],
        );

        $allocationType = $connection->executeQuery(
            'SELECT allocation_type FROM bucket WHERE id = :id',
            ['id' => $bucketId->toRfc4122()],
        )->fetchOne();

        self::assertSame(
            'fixed_limit',
            $allocationType,
            'When allocation_type is omitted from a raw INSERT, the DB column default must supply '
            .'\'fixed_limit\'. If this fails, the migration setting the column DEFAULT has regressed '
            .'(the insert would fail outright with a not-null violation instead of defaulting).',
        );
    }

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

        $first = new Bucket();
        $first->setScenario($scenario);
        $first->setType(BucketType::NEED);
        $first->setName('Rent');
        $first->setPriority(3);
        $first->setSortOrder(1);
        $first->setAllocationType(BucketAllocationType::FIXED_LIMIT);
        $first->setAllocationValue(150000);
        $first->setStartingAmount(5000);
        $first->setBufferMultiplier('0.00');
        $this->em->persist($first);
        $this->em->flush();

        $second = new Bucket();
        $second->setScenario($scenario);
        $second->setType(BucketType::NEED);
        $second->setName('Utilities');
        $second->setPriority(3);
        $second->setSortOrder(2);
        $second->setAllocationType(BucketAllocationType::FIXED_LIMIT);
        $second->setAllocationValue(50000);
        $second->setStartingAmount(3000);
        $second->setBufferMultiplier('0.00');
        $this->em->persist($second);

        $this->expectException(UniqueConstraintViolationException::class);
        $this->em->flush();
    }
}