<?php
declare(strict_types=1);

use KTXC\Context\TenantContextInterface;
use KTXC\Resource\ProviderManager;
use KTXF\Preview\PreviewGenerationException;
use KTXF\Preview\PreviewRequest;
use KTXF\Preview\PreviewSource;
use KTXF\Resource\BinaryResource;
use KTXF\Resource\Provider\ProviderInterface;
use KTXM\ProviderPreviewImageMagick\Provider as ImageProvider;
use KTXM\ServiceWopi\Host\Configuration;
use KTXM\ServiceWopi\Host\WopiService;
use KTXM\ServiceWopi\Module;
use KTXM\ServiceWopi\Preview\ConversionClient;
use KTXM\ServiceWopi\Preview\Provider;
use PHPUnit\Framework\TestCase;

final class PreviewTest extends TestCase
{
    public function testRegistersPreviewProvider(): void
    {
        $registry = $this->createMock(ProviderManager::class);
        $registry->expects(self::once())->method('register')->with(ProviderInterface::TYPE_PREVIEW, 'wopi', Provider::class);
        (new Module($registry))->boot();
    }

    public function testSupportedFormatsAndOutputs(): void
    {
        $provider = $this->provider($this->createStub(ConversionClient::class));
        foreach (WopiService::FORMATS as $mime) {
            self::assertTrue($provider->supports($mime, $this->request()));
        }
        self::assertFalse($provider->supports('application/pdf', $this->request()));
        self::assertFalse($provider->supports('invalid', $this->request()));
        self::assertFalse($provider->supports(WopiService::FORMATS['docx'], new PreviewRequest(100, 100, 'application/pdf', 80)));
    }

    public function testDisabledWopiDoesNotOfferPreviews(): void
    {
        $tenant = $this->createStub(TenantContextInterface::class);
        $tenant->method('requireIdentifier')->willReturn('tenant');
        $wopi = $this->createStub(WopiService::class);
        $wopi->method('configuration')->willThrowException(new \KTXM\ServiceWopi\Host\HostException('Disabled', 503));
        $provider = new Provider($tenant, $wopi, $this->createStub(ConversionClient::class), new ImageProvider());
        self::assertFalse($provider->supports(WopiService::FORMATS['docx'], $this->request()));
    }

    public function testRejectsStreamExceedingTenantLimitBeforeUpload(): void
    {
        $client = $this->createMock(ConversionClient::class);
        $client->expects(self::never())->method('pdf');
        $this->expectException(PreviewGenerationException::class);
        $this->provider($client, 3)->generate($this->source('oversized'), $this->request());
    }

    public function testConversionFailurePropagatesForManagerFallback(): void
    {
        $client = $this->createMock(ConversionClient::class);
        $client->expects(self::once())->method('pdf')->willThrowException(new PreviewGenerationException('Unavailable'));
        $this->expectException(PreviewGenerationException::class);
        $this->provider($client)->generate($this->source('document'), $this->request());
    }

    public function testRendersOnlyFirstPageAndResizesToRequestedOutput(): void
    {
        // Two differently shaped, colored pages make selecting the wrong page observable.
        $pdf = new Imagick();
        foreach ([[400, 200, 'red'], [200, 400, 'blue']] as [$width, $height, $color]) {
            $page = new Imagick();
            $page->newImage($width, $height, $color, 'pdf');
            $pdf->addImage($page);
            $page->clear();
        }
        $bytes = $pdf->getImagesBlob();
        $pdf->clear();
        $client = $this->createMock(ConversionClient::class);
        $client->expects(self::once())->method('pdf')->with(
            self::callback(fn ($server) => $server->url === 'https://office.test'),
            'document', 'docx', WopiService::FORMATS['docx'],
        )->willReturn($bytes);
        $result = $this->provider($client)->generate($this->source('document'), $this->request());
        self::assertSame(100, $result->width);
        self::assertSame(50, $result->height);
        self::assertSame('image/webp', $result->resource->mimeType());
        $output = implode('', iterator_to_array($result->resource->stream()));
        $image = new Imagick();
        $image->readImageBlob($output);
        $color = $image->getImagePixelColor(20, 20)->getColor();
        self::assertGreaterThan(200, $color['r']);
        self::assertLessThan(30, $color['b']);
        $image->clear();
    }

    private function provider(ConversionClient $client, int $limit = 1048576): Provider
    {
        $tenant = $this->createStub(TenantContextInterface::class);
        $tenant->method('requireIdentifier')->willReturn('tenant');
        $wopi = $this->createStub(WopiService::class);
        $wopi->method('configuration')->willReturn(new Configuration([
            'enabled' => true, 'office_server' => 'https://office.test',
            'origin_server' => 'https://app.test', 'max_bytes' => $limit,
        ]));
        return new Provider($tenant, $wopi, $client, new ImageProvider());
    }

    private function request(): PreviewRequest { return new PreviewRequest(100, 100, 'image/webp', 80); }

    private function source(string $content): PreviewSource
    {
        return new PreviewSource('document', 'file', 'version', WopiService::FORMATS['docx'], null,
            static fn () => new BinaryResource('file.docx', WopiService::FORMATS['docx'],
                (static function () use ($content): Generator { yield $content; })()));
    }
}