<?php

declare(strict_types=1);

namespace App\Tests\Unit\Service\State\Provider;

use ApiPlatform\Doctrine\Orm\Extension\QueryCollectionExtensionInterface;
use ApiPlatform\Doctrine\Orm\Util\QueryNameGenerator;
use ApiPlatform\Metadata\Operation;
use ApiPlatform\State\Pagination\Pagination;
use ApiPlatform\State\Pagination\TraversablePaginator;
use App\Service\State\Provider\ProviderUtils;
use Doctrine\DBAL\Connection;
use Doctrine\DBAL\Platforms\AbstractPlatform;
use Doctrine\ORM\EntityManagerInterface;
use Doctrine\ORM\EntityRepository;
use Doctrine\ORM\Query;
use Doctrine\ORM\QueryBuilder;
use Doctrine\ORM\Tools\Pagination\Paginator as DoctrinePaginator;
use PHPUnit\Framework\MockObject\MockObject;
use PHPUnit\Framework\TestCase;

class ProviderUtilsTest extends TestCase
{
    private ProviderUtils $providerUtils;
    private EntityManagerInterface|MockObject $entityManager;
    private Pagination $pagination;
    private QueryCollectionExtensionInterface|MockObject $extension1;
    private QueryCollectionExtensionInterface|MockObject $extension2;

    protected function setUp(): void
    {
        $this->entityManager = $this->createMock(EntityManagerInterface::class);
        $this->pagination = new Pagination(['enabled' => true]);
        $this->extension1 = $this->createMock(QueryCollectionExtensionInterface::class);
        $this->extension2 = $this->createMock(QueryCollectionExtensionInterface::class);
    }

    private function getProviderUtilsMockForMethod(string $methodName): ProviderUtils|MockObject
    {
        $providerUtils = $this
            ->getMockBuilder(ProviderUtils::class)
            ->setConstructorArgs([
                $this->entityManager,
                [$this->extension1, $this->extension2],
                $this->pagination
            ])
            ->setMethodsExcept([$methodName])
            ->getMock();

        return $providerUtils;
    }

    public function testApplyCollectionExtensionsAndPagination(): void
    {
        $providerUtils = $this->getProviderUtilsMockForMethod('applyCollectionExtensionsAndPagination');

        $entityClass = 'App\Entity\Test\TestEntity';
        $operation = $this->createMock(Operation::class);
        $context = ['filters' => ['name' => 'test']];

        $platform = $this->createMock(AbstractPlatform::class);
        $connection = $this->createMock(Connection::class);
        $connection->expects(self::any())->method('getDatabasePlatform')->willReturn($platform);

        $query = $this->createMock(Query::class);
        $query->method('getEntityManager')->willReturn($this->entityManager);

        $queryBuilder = $this->createMock(QueryBuilder::class);
        $queryBuilder->method('getQuery')->willReturn($query);
        $queryBuilder->method('getEntityManager')->willReturn($this->entityManager);

        $repository = $this->createMock(EntityRepository::class);

        $repository
            ->expects(self::once())
            ->method('createQueryBuilder')
            ->with('o')
            ->willReturn($queryBuilder);

        $this->entityManager
            ->expects(self::once())
            ->method('getRepository')
            ->with($entityClass)
            ->willReturn($repository);

        $this->entityManager
            ->method('getConnection')
            ->willReturn($connection);

        // Mock extensions applying to the query
        $this->extension1
            ->expects(self::once())
            ->method('applyToCollection')
            ->with(
                $queryBuilder,
                self::isInstanceOf(QueryNameGenerator::class),
                $entityClass,
                $operation,
                $context
            );

        $this->extension2
            ->expects(self::once())
            ->method('applyToCollection')
            ->with(
                $queryBuilder,
                self::isInstanceOf(QueryNameGenerator::class),
                $entityClass,
                $operation,
                $context
            );

        // Real pagination will be used

        $result = $providerUtils->applyCollectionExtensionsAndPagination($entityClass, $operation, $context);

        $this->assertInstanceOf(TraversablePaginator::class, $result);
    }

    public function testApplyCollectionExtensionsAndPaginationWithoutContext(): void
    {
        $providerUtils = $this->getProviderUtilsMockForMethod('applyCollectionExtensionsAndPagination');

        $entityClass = 'App\Entity\Test\TestEntity';
        $operation = $this->createMock(Operation::class);

        $platform = $this->createMock(AbstractPlatform::class);
        $connection = $this->createMock(Connection::class);
        $connection->expects(self::any())->method('getDatabasePlatform')->willReturn($platform);

        $query = $this->createMock(Query::class);
        $query->method('getEntityManager')->willReturn($this->entityManager);

        $queryBuilder = $this->createMock(QueryBuilder::class);
        $queryBuilder->method('getQuery')->willReturn($query);
        $queryBuilder->method('getEntityManager')->willReturn($this->entityManager);

        $repository = $this->createMock(EntityRepository::class);

        $repository
            ->expects(self::once())
            ->method('createQueryBuilder')
            ->with('o')
            ->willReturn($queryBuilder);

        $this->entityManager
            ->expects(self::once())
            ->method('getRepository')
            ->with($entityClass)
            ->willReturn($repository);

        $this->entityManager
            ->method('getConnection')
            ->willReturn($connection);

        // Extensions should still be applied with empty context
        $this->extension1
            ->expects(self::once())
            ->method('applyToCollection')
            ->with(
                $queryBuilder,
                self::isInstanceOf(QueryNameGenerator::class),
                $entityClass,
                $operation,
                []
            );

        $this->extension2
            ->expects(self::once())
            ->method('applyToCollection')
            ->with(
                $queryBuilder,
                self::isInstanceOf(QueryNameGenerator::class),
                $entityClass,
                $operation,
                []
            );

        $result = $providerUtils->applyCollectionExtensionsAndPagination($entityClass, $operation);

        $this->assertInstanceOf(TraversablePaginator::class, $result);
    }

    public function testApplyCollectionExtensionsAndPaginationWithNonQueryCollectionExtension(): void
    {
        $entityClass = 'App\Entity\Test\TestEntity';
        $operation = $this->createMock(Operation::class);

        $nonQueryExtension = new class {};

        $providerUtils = $this
            ->getMockBuilder(ProviderUtils::class)
            ->setConstructorArgs([
                $this->entityManager,
                [$this->extension1, $nonQueryExtension, $this->extension2],
                $this->pagination
            ])
            ->setMethodsExcept(['applyCollectionExtensionsAndPagination'])
            ->getMock();

        $platform = $this->createMock(AbstractPlatform::class);
        $connection = $this->createMock(Connection::class);
        $connection->expects(self::any())->method('getDatabasePlatform')->willReturn($platform);

        $query = $this->createMock(Query::class);
        $query->method('getEntityManager')->willReturn($this->entityManager);

        $queryBuilder = $this->createMock(QueryBuilder::class);
        $queryBuilder->method('getQuery')->willReturn($query);
        $queryBuilder->method('getEntityManager')->willReturn($this->entityManager);

        $repository = $this->createMock(EntityRepository::class);

        $repository
            ->expects(self::once())
            ->method('createQueryBuilder')
            ->with('o')
            ->willReturn($queryBuilder);

        $this->entityManager
            ->expects(self::once())
            ->method('getRepository')
            ->with($entityClass)
            ->willReturn($repository);

        $this->entityManager
            ->method('getConnection')
            ->willReturn($connection);

        $this->extension1
            ->expects(self::once())
            ->method('applyToCollection');

        $this->extension2
            ->expects(self::once())
            ->method('applyToCollection');

        $result = $providerUtils->applyCollectionExtensionsAndPagination($entityClass, $operation);

        $this->assertInstanceOf(TraversablePaginator::class, $result);
    }

    public function testApplyCollectionExtensionsAndPaginationCreatesCorrectDoctrinePaginator(): void
    {
        $providerUtils = $this->getProviderUtilsMockForMethod('applyCollectionExtensionsAndPagination');

        $entityClass = 'App\Entity\Test\TestEntity';
        $operation = $this->createMock(Operation::class);

        $platform = $this->createMock(AbstractPlatform::class);
        $connection = $this->createMock(Connection::class);
        $connection->expects(self::any())->method('getDatabasePlatform')->willReturn($platform);

        $query = $this->createMock(Query::class);
        $query->method('getEntityManager')->willReturn($this->entityManager);

        $queryBuilder = $this->createMock(QueryBuilder::class);
        $queryBuilder->method('getQuery')->willReturn($query);
        $queryBuilder->method('getEntityManager')->willReturn($this->entityManager);

        $repository = $this->createMock(EntityRepository::class);

        $repository
            ->expects(self::once())
            ->method('createQueryBuilder')
            ->with('o')
            ->willReturn($queryBuilder);

        $this->entityManager
            ->expects(self::once())
            ->method('getRepository')
            ->with($entityClass)
            ->willReturn($repository);

        $this->entityManager
            ->method('getConnection')
            ->willReturn($connection);

        $this->extension1
            ->expects(self::once())
            ->method('applyToCollection');

        $this->extension2
            ->expects(self::once())
            ->method('applyToCollection');

        // Real pagination will be used

        $result = $providerUtils->applyCollectionExtensionsAndPagination($entityClass, $operation);

        $this->assertInstanceOf(TraversablePaginator::class, $result);
    }

    public function testGetTraversablePaginator(): void
    {
        $providerUtils = $this->getProviderUtilsMockForMethod('getTraversablePaginator');

        $mappedItems = ['item1', 'item2', 'item3'];
        $originalPaginator = new TraversablePaginator(
            new \ArrayIterator(['original1', 'original2']),
            2,
            10,
            50
        );

        $result = $providerUtils->getTraversablePaginator($mappedItems, $originalPaginator);

        $this->assertInstanceOf(TraversablePaginator::class, $result);
        $this->assertEquals(2, $result->getCurrentPage());
        $this->assertEquals(10, $result->getItemsPerPage());
        $this->assertEquals(50, $result->getTotalItems());

        // Test that the iterator contains the mapped items
        $resultItems = iterator_to_array($result->getIterator());
        $this->assertSame($mappedItems, $resultItems);
    }

    public function testGetTraversablePaginatorWithEmptyMappedItems(): void
    {
        $providerUtils = $this->getProviderUtilsMockForMethod('getTraversablePaginator');

        $mappedItems = [];
        $originalPaginator = new TraversablePaginator(
            new \ArrayIterator([]),
            1,
            30,
            0
        );

        $result = $providerUtils->getTraversablePaginator($mappedItems, $originalPaginator);

        $this->assertInstanceOf(TraversablePaginator::class, $result);
        $this->assertEquals(1, $result->getCurrentPage());
        $this->assertEquals(30, $result->getItemsPerPage());
        $this->assertEquals(0, $result->getTotalItems());
        $this->assertEmpty(iterator_to_array($result->getIterator()));
    }

    public function testGetTraversablePaginatorWithComplexMappedItems(): void
    {
        $providerUtils = $this->getProviderUtilsMockForMethod('getTraversablePaginator');

        $mappedItems = [
            ['id' => 1, 'name' => 'Item 1'],
            ['id' => 2, 'name' => 'Item 2'],
            (object)['id' => 3, 'name' => 'Item 3'],
        ];
        $originalPaginator = new TraversablePaginator(
            new \ArrayIterator(['original1', 'original2', 'original3']),
            3,
            5,
            100
        );

        $result = $providerUtils->getTraversablePaginator($mappedItems, $originalPaginator);

        $this->assertInstanceOf(TraversablePaginator::class, $result);
        $this->assertEquals(3, $result->getCurrentPage());
        $this->assertEquals(5, $result->getItemsPerPage());
        $this->assertEquals(100, $result->getTotalItems());

        $resultItems = iterator_to_array($result->getIterator());
        $this->assertCount(3, $resultItems);
        $this->assertSame($mappedItems, $resultItems);
    }
}