<?php

declare(strict_types=1);

namespace Doctrine\Tests\ORM;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\EventManager;
use Doctrine\DBAL\Connection;
use Doctrine\DBAL\Platforms\AbstractPlatform;
use Doctrine\DBAL\Result;
use Doctrine\ORM\PersistentCollection;
use Doctrine\ORM\UnitOfWork;
use Doctrine\Tests\Mocks\EntityManagerMock;
use Doctrine\Tests\Models\ECommerce\ECommerceCart;
use Doctrine\Tests\Models\ECommerce\ECommerceProduct;
use Doctrine\Tests\OrmTestCase;
use PHPUnit\Framework\MockObject\MockObject;
use stdClass;

use function array_keys;
use function assert;
use function method_exists;
use function serialize;
use function unserialize;

/**
 * Tests the lazy-loading capabilities of the PersistentCollection and the initialization of collections.
 */
class PersistentCollectionTest extends OrmTestCase
{
    /** @var PersistentCollection */
    protected $collection;

    /** @var EntityManagerMock */
    private $_emMock;

    protected function setUp(): void
    {
        parent::setUp();

        $platform = $this->createMock(AbstractPlatform::class);
        $platform->method('supportsIdentityColumns')
            ->willReturn(true);

        if (method_exists($platform, 'getSQLResultCasing')) {
            $platform->method('getSQLResultCasing')
                ->willReturnArgument(0);
        }

        $connection = $this->createMock(Connection::class);
        $connection->method('getDatabasePlatform')
            ->willReturn($platform);
        $connection->method('getEventManager')
            ->willReturn(new EventManager());
        $connection->method('executeQuery')
            ->willReturn($this->createMock(Result::class));

        $this->_emMock = new EntityManagerMock($connection);

        $this->setUpPersistentCollection();
    }

    /**
     * Set up the PersistentCollection used for collection initialization tests.
     */
    public function setUpPersistentCollection(): void
    {
        $classMetaData    = $this->_emMock->getClassMetadata(ECommerceCart::class);
        $this->collection = new PersistentCollection($this->_emMock, $classMetaData, new ArrayCollection());
        $this->collection->setInitialized(false);
        $this->collection->setOwner(new ECommerceCart(), $classMetaData->getAssociationMapping('products'));
    }

    public function testCanBePutInLazyLoadingMode(): void
    {
        $class      = $this->_emMock->getClassMetadata(ECommerceProduct::class);
        $collection = new PersistentCollection($this->_emMock, $class, new ArrayCollection());
        $collection->setInitialized(false);
        self::assertFalse($collection->isInitialized());
    }

    /**
     * Test that PersistentCollection::current() initializes the collection.
     */
    public function testCurrentInitializesCollection(): void
    {
        $this->collection->current();
        self::assertTrue($this->collection->isInitialized());
    }

    /**
     * Test that PersistentCollection::key() initializes the collection.
     */
    public function testKeyInitializesCollection(): void
    {
        $this->collection->key();
        self::assertTrue($this->collection->isInitialized());
    }

    /**
     * Test that PersistentCollection::next() initializes the collection.
     */
    public function testNextInitializesCollection(): void
    {
        $this->collection->next();
        self::assertTrue($this->collection->isInitialized());
    }

    /** @group DDC-3382 */
    public function testNonObjects(): void
    {
        self::assertEmpty($this->collection);

        $this->collection->add('dummy');

        self::assertNotEmpty($this->collection);

        $product = new ECommerceProduct();

        $this->collection->set(1, $product);
        $this->collection->set(2, 'dummy');
        $this->collection->set(3, null);

        self::assertSame($product, $this->collection->get(1));
        self::assertSame('dummy', $this->collection->get(2));
        self::assertNull($this->collection->get(3));
    }

    /** @group 6110 */
    public function testRemovingElementsAlsoRemovesKeys(): void
    {
        $dummy = new stdClass();

        $this->collection->add($dummy);
        self::assertEquals([0], array_keys($this->collection->toArray()));

        $this->collection->removeElement($dummy);
        self::assertEquals([], array_keys($this->collection->toArray()));
    }

    /** @group 6110 */
    public function testClearWillAlsoClearKeys(): void
    {
        $this->collection->add(new stdClass());
        $this->collection->clear();
        self::assertEquals([], array_keys($this->collection->toArray()));
    }

    /** @group 6110 */
    public function testClearWillAlsoResetKeyPositions(): void
    {
        $dummy = new stdClass();

        $this->collection->add($dummy);
        $this->collection->removeElement($dummy);
        $this->collection->clear();
        $this->collection->add($dummy);
        self::assertEquals([0], array_keys($this->collection->toArray()));
    }

    /**
     * @group 6613
     * @group 6614
     * @group 6616
     */
    public function testWillKeepNewItemsInDirtyCollectionAfterInitialization(): void
    {
        $unitOfWork = $this->createMock(UnitOfWork::class);
        assert($unitOfWork instanceof UnitOfWork || $unitOfWork instanceof MockObject);

        $this->_emMock->setUnitOfWork($unitOfWork);

        $newElement       = new stdClass();
        $persistedElement = new stdClass();

        $this->collection->add($newElement);

        self::assertFalse($this->collection->isInitialized());
        self::assertTrue($this->collection->isDirty());

        $unitOfWork
            ->expects(self::once())
            ->method('loadCollection')
            ->with($this->collection)
            ->willReturnCallback(static function (PersistentCollection $persistentCollection) use ($persistedElement): void {
                $persistentCollection->unwrap()->add($persistedElement);
            });

        $this->collection->initialize();

        self::assertSame([$persistedElement, $newElement], $this->collection->toArray());
        self::assertTrue($this->collection->isInitialized());
        self::assertTrue($this->collection->isDirty());
    }

    /**
     * @group 6613
     * @group 6614
     * @group 6616
     */
    public function testWillDeDuplicateNewItemsThatWerePreviouslyPersistedInDirtyCollectionAfterInitialization(): void
    {
        $unitOfWork = $this->createMock(UnitOfWork::class);
        assert($unitOfWork instanceof UnitOfWork || $unitOfWork instanceof MockObject);

        $this->_emMock->setUnitOfWork($unitOfWork);

        $newElement                    = new stdClass();
        $newElementThatIsAlsoPersisted = new stdClass();
        $persistedElement              = new stdClass();

        $this->collection->add($newElementThatIsAlsoPersisted);
        $this->collection->add($newElement);

        self::assertFalse($this->collection->isInitialized());
        self::assertTrue($this->collection->isDirty());

        $unitOfWork
            ->expects(self::once())
            ->method('loadCollection')
            ->with($this->collection)
            ->willReturnCallback(static function (PersistentCollection $persistentCollection) use (
                $persistedElement,
                $newElementThatIsAlsoPersisted
            ): void {
                $persistentCollection->unwrap()->add($newElementThatIsAlsoPersisted);
                $persistentCollection->unwrap()->add($persistedElement);
            });

        $this->collection->initialize();

        self::assertSame(
            [$newElementThatIsAlsoPersisted, $persistedElement, $newElement],
            $this->collection->toArray()
        );
        self::assertTrue($this->collection->isInitialized());
        self::assertTrue($this->collection->isDirty());
    }

    /**
     * @group 6613
     * @group 6614
     * @group 6616
     */
    public function testWillNotMarkCollectionAsDirtyAfterInitializationIfNoElementsWereAdded(): void
    {
        $unitOfWork = $this->createMock(UnitOfWork::class);
        assert($unitOfWork instanceof UnitOfWork || $unitOfWork instanceof MockObject);

        $this->_emMock->setUnitOfWork($unitOfWork);

        $newElementThatIsAlsoPersisted = new stdClass();
        $persistedElement              = new stdClass();

        $this->collection->add($newElementThatIsAlsoPersisted);

        self::assertFalse($this->collection->isInitialized());
        self::assertTrue($this->collection->isDirty());

        $unitOfWork
            ->expects(self::once())
            ->method('loadCollection')
            ->with($this->collection)
            ->willReturnCallback(static function (PersistentCollection $persistentCollection) use (
                $persistedElement,
                $newElementThatIsAlsoPersisted
            ): void {
                $persistentCollection->unwrap()->add($newElementThatIsAlsoPersisted);
                $persistentCollection->unwrap()->add($persistedElement);
            });

        $this->collection->initialize();

        self::assertSame(
            [$newElementThatIsAlsoPersisted, $persistedElement],
            $this->collection->toArray()
        );
        self::assertTrue($this->collection->isInitialized());
        self::assertFalse($this->collection->isDirty());
    }

    public function testModifyUOWForDeferredImplicitOwnerOnClear(): void
    {
        $unitOfWork = $this->createMock(UnitOfWork::class);
        $unitOfWork->expects(self::once())->method('scheduleCollectionDeletion');
        $this->_emMock->setUnitOfWork($unitOfWork);

        $this->collection->clear();
    }

    public function testItCanBeSerializedAndUnserializedBack(): void
    {
        $this->collection->add(new stdClass());
        $collection = unserialize(serialize($this->collection));
        $collection->add(new stdClass());
        $collection[3] = new stdClass();
        self::assertCount(3, $collection);
    }
}