<?php

declare(strict_types=1);

use App\Models\Artwork;
use App\Services\Vision\AiArtworkVectorSearchService;
use App\Services\Vision\VectorGatewayClient;
use App\Services\Vision\VectorGatewayException;
use Illuminate\Http\Client\ConnectionException;
use Illuminate\Http\UploadedFile;
use Illuminate\Log\Events\MessageLogged;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Event;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Storage;
use function Pest\Laravel\getJson;

uses(\Illuminate\Foundation\Testing\RefreshDatabase::class);

beforeEach(function (): void {
    config()->set('vision.vector_gateway.enabled', true);
    config()->set('vision.vector_gateway.base_url', 'https://vision.klevze.net');
    config()->set('vision.vector_gateway.api_key', 'test-key');
    config()->set('vision.vector_gateway.search_endpoint', '/vectors/search');
    config()->set('vision.vector_gateway.search_file_endpoint', '/vectors/search/file');
    config()->set('vision.vector_gateway.circuit_breaker_seconds', 30);
    config()->set('cdn.files_url', 'https://files.skinbase.org');
    config()->set('app.url', 'https://skinbase.test');
    Storage::fake('public');
    Cache::flush();
});

function similarPair(): array
{
    $source = Artwork::factory()->create([
        'title' => 'Circuit source',
        'hash' => 'aa11bb22cc33',
        'thumb_ext' => 'webp',
        'is_public' => true,
        'is_approved' => true,
        'published_at' => now()->subHour(),
    ]);
    $match = Artwork::factory()->create([
        'title' => 'Circuit match',
        'hash' => 'dd44ee55ff66',
        'thumb_ext' => 'webp',
        'is_public' => true,
        'is_approved' => true,
        'published_at' => now()->subHour(),
    ]);

    return [$source, $match];
}

function fakeSuccessfulUrlSearch(Artwork $source, Artwork $match): array
{
    return [
        'https://files.skinbase.org/*' => Http::response('image-bytes', 200, ['Content-Type' => 'image/webp']),
        'https://vision.klevze.net/vectors/search' => Http::response([
            'results' => [
                ['id' => $source->id, 'score' => 1.0],
                ['id' => $match->id, 'score' => 0.91],
            ],
        ], 200),
    ];
}

it('does not call URL search when file search succeeds and leaves the circuit closed', function (): void {
    [$source, $match] = similarPair();

    Http::fake([
        'https://files.skinbase.org/*' => Http::response('image-bytes', 200, ['Content-Type' => 'image/webp']),
        'https://vision.klevze.net/vectors/search/file' => Http::response([
            'results' => [
                ['id' => $source->id, 'score' => 1.0],
                ['id' => $match->id, 'score' => 0.91],
            ],
        ], 200),
        'https://vision.klevze.net/vectors/search' => Http::response(['error' => 'should not be called'], 500),
    ]);

    getJson('/api/art/'.$source->id.'/similar-ai')->assertOk()->assertJsonPath('data.0.id', $match->id);

    Http::assertNotSent(fn ($request): bool => $request->url() === 'https://vision.klevze.net/vectors/search');
    expect(app(VectorGatewayClient::class)->circuitOpen())->toBeFalse();
});

it('falls back to URL search after file 400 and keeps the circuit closed', function (): void {
    [$source, $match] = similarPair();

    Http::fake(array_merge(fakeSuccessfulUrlSearch($source, $match), [
        'https://vision.klevze.net/vectors/search/file' => Http::response(['error' => 'bad image'], 400),
    ]));

    getJson('/api/art/'.$source->id.'/similar-ai')->assertOk()->assertJsonPath('data.0.id', $match->id);
    Http::assertSent(fn ($request): bool => $request->url() === 'https://vision.klevze.net/vectors/search');
    expect(app(VectorGatewayClient::class)->circuitOpen())->toBeFalse();
});

it('falls back to URL search after file 500 and keeps the circuit closed', function (): void {
    [$source, $match] = similarPair();
    $logged = [];
    Event::listen(MessageLogged::class, function (MessageLogged $event) use (&$logged): void {
        $logged[] = $event;
    });

    Http::fake(array_merge(fakeSuccessfulUrlSearch($source, $match), [
        'https://vision.klevze.net/vectors/search/file' => Http::response(['error' => 'upstream'], 500),
    ]));

    getJson('/api/art/'.$source->id.'/similar-ai')->assertOk()->assertJsonPath('data.0.id', $match->id);
    expect(app(VectorGatewayClient::class)->circuitOpen())->toBeFalse()
        ->and(openedCircuitLogs($logged))->toHaveCount(0);
});

it('falls back to URL search after a file connection failure and keeps the circuit closed', function (): void {
    [$source, $match] = similarPair();

    Http::fake(array_merge(fakeSuccessfulUrlSearch($source, $match), [
        'https://vision.klevze.net/vectors/search/file' => function () {
            throw new ConnectionException('cURL error 28: Operation timed out');
        },
    ]));

    getJson('/api/art/'.$source->id.'/similar-ai')->assertOk()->assertJsonPath('data.0.id', $match->id);
    expect(app(VectorGatewayClient::class)->circuitOpen())->toBeFalse();
});

function openedCircuitLogs(array $logged): array
{
    return array_values(array_filter(
        $logged,
        static fn (MessageLogged $event): bool => $event->message === 'Vector gateway circuit opened',
    ));
}

it('opens the circuit when both search strategies fail transiently', function (): void {
    [$source] = similarPair();
    $logged = [];
    Event::listen(MessageLogged::class, function (MessageLogged $event) use (&$logged): void {
        $logged[] = $event;
    });

    Http::fake([
        'https://files.skinbase.org/*' => Http::response('image-bytes', 200, ['Content-Type' => 'image/webp']),
        'https://vision.klevze.net/vectors/search/file' => Http::response(['error' => 'down'], 503),
        'https://vision.klevze.net/vectors/search' => Http::response(['error' => 'down'], 503),
    ]);

    getJson('/api/art/'.$source->id.'/similar-ai')
        ->assertStatus(502)
        ->assertJson([
            'data' => [],
            'reason' => 'vector_gateway_error',
        ])
        ->assertJsonMissingPath('message');

    expect(app(VectorGatewayClient::class)->circuitOpen())->toBeTrue();

    $opened = openedCircuitLogs($logged);
    expect($opened)->toHaveCount(1)
        ->and($opened[0]->level)->toBe('warning')
        ->and($opened[0]->context['source'] ?? null)->toBe('similar_ai')
        ->and($opened[0]->context['artwork_id'] ?? null)->toBe($source->id)
        ->and($opened[0]->context['circuit_ttl_seconds'] ?? null)->toBe(30)
        ->and($opened[0]->context)->toHaveKey('php_sapi')
        ->and($opened[0]->context)->toHaveKey('running_in_console');

    $operations = collect($opened[0]->context['failures'] ?? [])->pluck('operation')->all();
    $statuses = collect($opened[0]->context['failures'] ?? [])->pluck('http_status')->all();
    expect($operations)->toContain('search_file')
        ->and($operations)->toContain('search_url')
        ->and($statuses)->toBe([503, 503]);

    $encoded = json_encode($opened[0]->context);
    expect($encoded)->not->toContain('test-key')
        ->and($encoded)->not->toContain('image-bytes')
        ->and($encoded)->not->toContain('vision.klevze.net')
        ->and($encoded)->not->toContain('files.skinbase.org');
});

it('does not open the circuit when both strategies fail with permanent 4xx', function (): void {
    [$source] = similarPair();
    $logged = [];
    Event::listen(MessageLogged::class, function (MessageLogged $event) use (&$logged): void {
        $logged[] = $event;
    });

    Http::fake([
        'https://files.skinbase.org/*' => Http::response('image-bytes', 200, ['Content-Type' => 'image/webp']),
        'https://vision.klevze.net/vectors/search/file' => Http::response(['error' => 'bad file'], 400),
        'https://vision.klevze.net/vectors/search' => Http::response(['error' => 'bad url'], 422),
    ]);

    getJson('/api/art/'.$source->id.'/similar-ai')->assertStatus(502);
    expect(app(VectorGatewayClient::class)->circuitOpen())->toBeFalse()
        ->and(openedCircuitLogs($logged))->toHaveCount(0);
});

it('fails fast when the circuit is already open without downloading or calling the gateway', function (): void {
    [$source] = similarPair();
    Cache::put('vision.vector_gateway.circuit_open', true, 30);
    $logged = [];
    Event::listen(MessageLogged::class, function (MessageLogged $event) use (&$logged): void {
        $logged[] = $event;
    });

    Http::fake();

    getJson('/api/art/'.$source->id.'/similar-ai')
        ->assertStatus(502)
        ->assertJsonPath('reason', 'vector_gateway_error')
        ->assertJsonMissingPath('message');

    Http::assertNothingSent();
    expect(openedCircuitLogs($logged))->toHaveCount(0);

    $failFast = collect($logged)->first(fn (MessageLogged $event): bool => $event->message === 'Vector similarity search failed');
    expect($failFast)->not->toBeNull()
        ->and($failFast->context['failure_stage'] ?? null)->toBe('circuit');
});

it('logs one structured warning on final similarity failure without leaking internals', function (): void {
    [$source] = similarPair();
    $logged = [];
    Event::listen(MessageLogged::class, function (MessageLogged $event) use (&$logged): void {
        $logged[] = $event;
    });

    Http::fake([
        'https://files.skinbase.org/*' => Http::response('image-bytes', 200, ['Content-Type' => 'image/webp']),
        'https://vision.klevze.net/vectors/search/file' => Http::response(['error' => 'x'], 500),
        'https://vision.klevze.net/vectors/search' => Http::response(['error' => 'y'], 500),
    ]);

    getJson('/api/art/'.$source->id.'/similar-ai')->assertStatus(502);

    $match = collect($logged)->first(fn (MessageLogged $event): bool => str_contains((string) $event->message, 'Vector similarity search failed'));
    expect($match)->not->toBeNull()
        ->and($match->level)->toBe('warning')
        ->and($match->context['artwork_id'] ?? null)->toBe($source->id)
        ->and($match->context['route'] ?? null)->toBe('api.art.similar-ai')
        ->and($match->context)->toHaveKey('circuit_worthy')
        ->and($match->context)->toHaveKey('circuit_open')
        ->and(json_encode($match->context))->not->toContain('test-key')
        ->and(json_encode($match->context))->not->toContain('image-bytes');
});

it('does not trip the circuit when file gateway was never attempted and URL returns 502', function (): void {
    [$source] = similarPair();
    $logged = [];
    Event::listen(MessageLogged::class, function (MessageLogged $event) use (&$logged): void {
        $logged[] = $event;
    });

    Http::fake([
        'https://files.skinbase.org/*' => Http::response('not-found', 404),
        'https://vision.klevze.net/vectors/search' => Http::response(['error' => 'bad gateway'], 502),
        'https://vision.klevze.net/vectors/search/file' => Http::response(['error' => 'should not be called'], 500),
    ]);

    getJson('/api/art/'.$source->id.'/similar-ai')
        ->assertStatus(502)
        ->assertJsonPath('reason', 'vector_gateway_error');

    Http::assertNotSent(fn ($request): bool => $request->url() === 'https://vision.klevze.net/vectors/search/file');
    expect(app(VectorGatewayClient::class)->circuitOpen())->toBeFalse()
        ->and(openedCircuitLogs($logged))->toHaveCount(0);
});

it('does not trip the circuit when image download throws before the file gateway', function (): void {
    [$source] = similarPair();
    $logged = [];
    Event::listen(MessageLogged::class, function (MessageLogged $event) use (&$logged): void {
        $logged[] = $event;
    });

    Http::fake([
        'https://files.skinbase.org/*' => function () {
            throw new RuntimeException('cdn unavailable');
        },
        'https://vision.klevze.net/vectors/search' => Http::response(['error' => 'bad gateway'], 502),
    ]);

    getJson('/api/art/'.$source->id.'/similar-ai')->assertStatus(502);
    expect(app(VectorGatewayClient::class)->circuitOpen())->toBeFalse()
        ->and(openedCircuitLogs($logged))->toHaveCount(0);
});

it('does not trip the circuit when file gateway is 422 and URL is 502', function (): void {
    [$source] = similarPair();
    $logged = [];
    Event::listen(MessageLogged::class, function (MessageLogged $event) use (&$logged): void {
        $logged[] = $event;
    });

    Http::fake([
        'https://files.skinbase.org/*' => Http::response('image-bytes', 200, ['Content-Type' => 'image/webp']),
        'https://vision.klevze.net/vectors/search/file' => Http::response(['error' => 'unprocessable'], 422),
        'https://vision.klevze.net/vectors/search' => Http::response(['error' => 'bad gateway'], 502),
    ]);

    getJson('/api/art/'.$source->id.'/similar-ai')->assertStatus(502);
    expect(app(VectorGatewayClient::class)->circuitOpen())->toBeFalse()
        ->and(openedCircuitLogs($logged))->toHaveCount(0);
});

it('does not trip the circuit when file gateway is 503 and URL is 422', function (): void {
    [$source] = similarPair();
    $logged = [];
    Event::listen(MessageLogged::class, function (MessageLogged $event) use (&$logged): void {
        $logged[] = $event;
    });

    Http::fake([
        'https://files.skinbase.org/*' => Http::response('image-bytes', 200, ['Content-Type' => 'image/webp']),
        'https://vision.klevze.net/vectors/search/file' => Http::response(['error' => 'down'], 503),
        'https://vision.klevze.net/vectors/search' => Http::response(['error' => 'bad url'], 422),
    ]);

    getJson('/api/art/'.$source->id.'/similar-ai')->assertStatus(502);
    expect(app(VectorGatewayClient::class)->circuitOpen())->toBeFalse()
        ->and(openedCircuitLogs($logged))->toHaveCount(0);
});

it('attributes uploaded-image transient failures as uploaded_image', function (): void {
    $logged = [];
    Event::listen(MessageLogged::class, function (MessageLogged $event) use (&$logged): void {
        $logged[] = $event;
    });

    Http::fake([
        'https://vision.klevze.net/vectors/search/file' => Http::response(['error' => 'down'], 503),
    ]);

    $file = UploadedFile::fake()->image('query.png', 64, 64);

    expect(fn () => app(AiArtworkVectorSearchService::class)->searchByUploadedImage($file, 12))
        ->toThrow(VectorGatewayException::class);

    expect(app(VectorGatewayClient::class)->circuitOpen())->toBeTrue();

    $opened = openedCircuitLogs($logged);
    expect($opened)->toHaveCount(1)
        ->and($opened[0]->context['source'] ?? null)->toBe('uploaded_image')
        ->and($opened[0]->context['failures'][0]['operation'] ?? null)->toBe('search_file')
        ->and($opened[0]->context['failures'][0]['http_status'] ?? null)->toBe(503)
        ->and(json_encode($opened[0]->context))->not->toContain('test-key');
});

it('serves similar-ai from cache without contacting the gateway', function (): void {
    [$source, $match] = similarPair();

    Http::fake([
        'https://files.skinbase.org/*' => Http::response('image-bytes', 200, ['Content-Type' => 'image/webp']),
        'https://vision.klevze.net/vectors/search/file' => Http::response([
            'results' => [
                ['id' => $source->id, 'score' => 1.0],
                ['id' => $match->id, 'score' => 0.91],
            ],
        ], 200),
    ]);

    getJson('/api/art/'.$source->id.'/similar-ai')->assertOk();

    Http::fake(function () {
        throw new RuntimeException('gateway should not be called on cache hit');
    });

    getJson('/api/art/'.$source->id.'/similar-ai')
        ->assertOk()
        ->assertJsonPath('data.0.id', $match->id);
});