<?php

declare(strict_types=1);

namespace Tests\Unit;

use App\Support\ResponsiveImage;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Storage;
use Intervention\Image\Drivers\Gd\Driver;
use Intervention\Image\ImageManager;
use RuntimeException;
use Tests\TestCase;

class ResponsiveImageTest extends TestCase
{
    protected function setUp(): void
    {
        parent::setUp();

        config(['cache.default' => 'array']);
        Cache::store('array')->flush();
    }

    public function test_generates_named_variants_and_removes_them_with_original(): void
    {
        Storage::fake('public');

        $manager = new ImageManager(new Driver);
        $original = $manager->create(2000, 1200)->toJpeg(quality: 90);
        $path = 'content/abc123.jpg';

        Storage::disk('public')->put($path, (string) $original);

        ResponsiveImage::generate($path, 'public');

        Storage::disk('public')->assertExists('content/abc123-480.jpg');
        Storage::disk('public')->assertExists('content/abc123-960.jpg');
        Storage::disk('public')->assertExists('content/abc123-1440.jpg');

        $variant480 = (new ImageManager(new Driver))->read(Storage::disk('public')->path('content/abc123-480.jpg'));
        $this->assertSame(480, $variant480->width());

        ResponsiveImage::delete($path, 'public');

        Storage::disk('public')->assertMissing($path);
        Storage::disk('public')->assertMissing('content/abc123-480.jpg');
        Storage::disk('public')->assertMissing('content/abc123-960.jpg');
        Storage::disk('public')->assertMissing('content/abc123-1440.jpg');
    }

    public function test_replace_deletes_previous_variants_and_generates_for_new_original(): void
    {
        Storage::fake('public');

        $manager = new ImageManager(new Driver);
        Storage::disk('public')->put('content/old.jpg', (string) $manager->create(1600, 900)->toJpeg());
        ResponsiveImage::generate('content/old.jpg', 'public');

        Storage::disk('public')->put('content/new.jpg', (string) $manager->create(1800, 1000)->toJpeg());

        ResponsiveImage::replace('content/old.jpg', 'content/new.jpg', 'public');

        Storage::disk('public')->assertMissing('content/old.jpg');
        Storage::disk('public')->assertMissing('content/old-480.jpg');
        Storage::disk('public')->assertExists('content/new.jpg');
        Storage::disk('public')->assertExists('content/new-480.jpg');
        Storage::disk('public')->assertExists('content/new-960.jpg');
        Storage::disk('public')->assertExists('content/new-1440.jpg');
    }

    public function test_generates_a_webp_sibling_for_every_variant(): void
    {
        Storage::fake('public');

        $manager = new ImageManager(new Driver);
        $path = 'content/photo.jpg';

        Storage::disk('public')->put($path, (string) $manager->create(2000, 1200)->toJpeg(quality: 90));

        ResponsiveImage::generate($path, 'public');

        foreach (ResponsiveImage::WIDTHS as $width) {
            Storage::disk('public')->assertExists("content/photo-{$width}.jpg.webp");
        }

        $this->assertSame(
            ResponsiveImage::WIDTHS,
            array_column(ResponsiveImage::availableWebpVariants($path, 'public'), 'width'),
        );

        // The original format stays available so a browser that cannot decode
        // webp still has something to fall back to through the <img>.
        foreach (ResponsiveImage::WIDTHS as $width) {
            Storage::disk('public')->assertExists("content/photo-{$width}.jpg");
        }

        ResponsiveImage::delete($path, 'public');

        foreach (ResponsiveImage::WIDTHS as $width) {
            Storage::disk('public')->assertMissing("content/photo-{$width}.jpg.webp");
        }
    }

    public function test_webp_originals_do_not_get_a_duplicate_webp_sibling(): void
    {
        Storage::fake('public');

        $manager = new ImageManager(new Driver);
        $path = 'content/already.webp';

        Storage::disk('public')->put($path, (string) $manager->create(1600, 900)->toWebp());

        ResponsiveImage::generate($path, 'public');

        Storage::disk('public')->assertExists('content/already-480.webp');
        Storage::disk('public')->assertMissing('content/already-480.webp.webp');
        $this->assertSame([], ResponsiveImage::availableWebpVariants($path, 'public'));
    }

    public function test_metadata_is_cached_after_the_first_storage_read(): void
    {
        Storage::fake('public');

        $manager = new ImageManager(new Driver);
        $path = 'content/cached.jpg';
        Storage::disk('public')->put($path, (string) $manager->create(1600, 900)->toJpeg());
        ResponsiveImage::generate($path, 'public');

        $metadata = ResponsiveImage::metadata($path, 'public');

        $this->assertSame(['width' => 1600, 'height' => 900], [
            'width' => $metadata['width'],
            'height' => $metadata['height'],
        ]);
        $this->assertSame(ResponsiveImage::WIDTHS, array_column($metadata['variants'], 'width'));
        $this->assertSame(ResponsiveImage::WIDTHS, array_column($metadata['webp_variants'], 'width'));

        Storage::disk('public')->delete(array_merge(
            [$path],
            array_map(fn (int $width): string => ResponsiveImage::variantPath($path, $width), ResponsiveImage::WIDTHS),
            array_map(fn (int $width): string => ResponsiveImage::webpVariantPath($path, $width), ResponsiveImage::WIDTHS),
        ));

        $this->assertSame($metadata, ResponsiveImage::metadata($path, 'public'));
    }

    public function test_generation_populates_metadata_and_deletion_invalidates_it(): void
    {
        Storage::fake('public');

        $manager = new ImageManager(new Driver);
        $path = 'content/generated.jpg';
        Storage::disk('public')->put($path, (string) $manager->create(1400, 800)->toJpeg());

        ResponsiveImage::generate($path, 'public');

        $this->assertSame(['width' => 1400, 'height' => 800], ResponsiveImage::dimensions($path, 'public'));
        $this->assertSame(ResponsiveImage::WIDTHS, array_column(ResponsiveImage::availableVariants($path, 'public'), 'width'));

        ResponsiveImage::delete($path, 'public');

        $this->assertNull(ResponsiveImage::metadata($path, 'public'));
    }

    public function test_replacement_invalidates_old_metadata_and_populates_new_metadata(): void
    {
        Storage::fake('public');

        $manager = new ImageManager(new Driver);
        Storage::disk('public')->put('content/old-metadata.jpg', (string) $manager->create(1600, 900)->toJpeg());
        ResponsiveImage::generate('content/old-metadata.jpg', 'public');
        ResponsiveImage::metadata('content/old-metadata.jpg', 'public');

        Storage::disk('public')->put('content/new-metadata.jpg', (string) $manager->create(1200, 675)->toJpeg());
        ResponsiveImage::replace('content/old-metadata.jpg', 'content/new-metadata.jpg', 'public');

        $this->assertNull(ResponsiveImage::metadata('content/old-metadata.jpg', 'public'));
        $this->assertSame(['width' => 1200, 'height' => 675], ResponsiveImage::dimensions('content/new-metadata.jpg', 'public'));
    }

    public function test_metadata_falls_back_safely_when_the_cache_is_unavailable(): void
    {
        Cache::shouldReceive('get')
            ->once()
            ->andThrow(new RuntimeException('Cache unavailable'));

        $this->assertNull(ResponsiveImage::metadata('content/unavailable.jpg', 'public'));
    }
}