<?php

declare(strict_types=1);

namespace App\Tests\Unit\Scolarite\Infrastructure\Storage;

use App\Scolarite\Infrastructure\Storage\S3FileStorage;

use function fopen;

use League\Flysystem\Filesystem;
use League\Flysystem\UnableToDeleteFile;
use League\Flysystem\UnableToReadFile;
use PHPUnit\Framework\Attributes\Test;
use PHPUnit\Framework\TestCase;
use Psr\Log\LoggerInterface;
use ReflectionClass;
use RuntimeException;

final class S3FileStorageTest extends TestCase
{
    private Filesystem $filesystem;
    private LoggerInterface $logger;
    private S3FileStorage $storage;

    protected function setUp(): void
    {
        $this->filesystem = $this->createMock(Filesystem::class);
        $this->logger = $this->createMock(LoggerInterface::class);

        $this->storage = $this->createStorageWithMockedFilesystem($this->filesystem, $this->logger);
    }

    #[Test]
    public function uploadWritesStringContentToFilesystem(): void
    {
        $this->filesystem->expects(self::once())
            ->method('write')
            ->with('homework/abc/file.pdf', 'fake content', ['ContentType' => 'application/pdf']);

        $result = $this->storage->upload('homework/abc/file.pdf', 'fake content', 'application/pdf');

        self::assertSame('homework/abc/file.pdf', $result);
    }

    #[Test]
    public function uploadWritesStreamContentToFilesystem(): void
    {
        /** @var resource $stream */
        $stream = fopen('php://memory', 'r+');

        $this->filesystem->expects(self::once())
            ->method('writeStream')
            ->with('homework/abc/file.pdf', $stream, ['ContentType' => 'application/pdf']);

        $result = $this->storage->upload('homework/abc/file.pdf', $stream, 'application/pdf');

        self::assertSame('homework/abc/file.pdf', $result);
    }

    #[Test]
    public function deleteRemovesFileFromFilesystem(): void
    {
        $this->filesystem->expects(self::once())
            ->method('delete')
            ->with('homework/abc/file.pdf');

        $this->logger->expects(self::never())
            ->method('warning');

        $this->storage->delete('homework/abc/file.pdf');
    }

    #[Test]
    public function deleteLogsWarningOnFailure(): void
    {
        $this->filesystem->expects(self::once())
            ->method('delete')
            ->willThrowException(UnableToDeleteFile::atLocation('homework/abc/file.pdf'));

        $this->logger->expects(self::once())
            ->method('warning')
            ->with(
                'S3 delete failed, possible orphan blob: {path}',
                self::callback(static fn (array $context): bool => $context['path'] === 'homework/abc/file.pdf'),
            );

        $this->storage->delete('homework/abc/file.pdf');
    }

    #[Test]
    public function readStreamReturnsResourceFromFilesystem(): void
    {
        /** @var resource $expectedStream */
        $expectedStream = fopen('php://memory', 'r+');

        $this->filesystem->expects(self::once())
            ->method('readStream')
            ->with('homework/abc/file.pdf')
            ->willReturn($expectedStream);

        $result = $this->storage->readStream('homework/abc/file.pdf');

        self::assertSame($expectedStream, $result);
    }

    #[Test]
    public function readStreamThrowsRuntimeExceptionOnMissingFile(): void
    {
        $this->filesystem->expects(self::once())
            ->method('readStream')
            ->with('homework/abc/missing.pdf')
            ->willThrowException(UnableToReadFile::fromLocation('homework/abc/missing.pdf'));

        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessage('Impossible de lire le fichier : homework/abc/missing.pdf');

        $this->storage->readStream('homework/abc/missing.pdf');
    }

    /**
     * Creates an S3FileStorage instance with a mocked Filesystem injected via reflection.
     *
     * S3FileStorage is `final readonly` and its constructor creates a real S3Client,
     * so we bypass it with newInstanceWithoutConstructor() and inject mocks directly.
     * If the class gains new properties, this method must be updated.
     */
    private function createStorageWithMockedFilesystem(Filesystem $filesystem, LoggerInterface $logger): S3FileStorage
    {
        $reflection = new ReflectionClass(S3FileStorage::class);
        $storage = $reflection->newInstanceWithoutConstructor();

        $fsProp = $reflection->getProperty('filesystem');
        $fsProp->setValue($storage, $filesystem);

        $loggerProp = $reflection->getProperty('logger');
        $loggerProp->setValue($storage, $logger);

        return $storage;
    }
}