<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Http\Requests\StoreEventMediaRequest;
use App\Http\Requests\UpdateEventMediaRequest;
use App\Http\Resources\EventMediaResource;
use App\Models\EventMedia;
use App\Services\EventMediaStore;
use App\Services\MediaCleaner;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\Storage;
use Symfony\Component\HttpFoundation\BinaryFileResponse;

class EventMediaController extends Controller
{
    public function __construct(private readonly MediaCleaner $mediaCleaner) {}

    public function index(Request $request, string $clientId): JsonResponse
    {
        $event = $request->user()->events()
            ->where('client_id', $clientId)
            ->firstOrFail();

        return response()->json([
            'data' => EventMediaResource::collection(
                $event->media()->orderBy('created_at')->get()
            ),
        ]);
    }

    public function store(
        StoreEventMediaRequest $request,
        EventMediaStore $store,
        string $clientId
    ): JsonResponse {
        $event = $request->user()->events()
            ->where('client_id', $clientId)
            ->firstOrFail();

        $media = $store->store(
            $event,
            $request->file('file'),
            $request->validated('collection') ?? 'gallery',
            $request->validated('caption'),
        );

        return (new EventMediaResource($media))
            ->response()
            ->setStatusCode(201);
    }

    public function show(Request $request, EventMedia $media, string $variant): Response|BinaryFileResponse
    {
        abort_unless(in_array($variant, ['thumb', 'preview', 'original'], true), 404);
        abort_unless((int) $media->user_id === (int) $request->user()->id, 404);

        $path = match ($variant) {
            'thumb' => $media->thumbnail_path,
            'preview' => $media->preview_path ?: $media->thumbnail_path,
            default => $media->path,
        };

        abort_unless(is_string($path) && $path !== '', 404);
        abort_unless(Storage::disk($media->disk)->exists($path), 404);

        $headers = ['Cache-Control' => 'private, max-age=604800'];

        if ($variant !== 'original') {
            // Thumbnails and previews are always JPEG, whatever the original.
            return response(Storage::disk($media->disk)->get($path), 200, [
                ...$headers,
                'Content-Type' => 'image/jpeg',
            ]);
        }

        // Originals may be videos or audio: a file response streams them and
        // honours Range requests, which media players need for seeking.
        return response()->file(Storage::disk($media->disk)->path($path), [
            ...$headers,
            'Content-Type' => $media->mime_type ?: 'application/octet-stream',
        ]);
    }

    /**
     * PATCH /api/events/{clientId}/media/{media} — the caption only; the
     * file itself is immutable.
     */
    public function update(UpdateEventMediaRequest $request, string $clientId, EventMedia $media): EventMediaResource
    {
        $event = $request->user()->events()
            ->where('client_id', $clientId)
            ->firstOrFail();

        abort_unless((int) $media->event_id === (int) $event->id, 404);

        $media->update(['caption' => $request->validated('caption') ?? '']);

        return new EventMediaResource($media->fresh());
    }

    public function destroy(Request $request, string $clientId, EventMedia $media): JsonResponse
    {
        $event = $request->user()->events()
            ->where('client_id', $clientId)
            ->firstOrFail();

        abort_unless((int) $media->event_id === (int) $event->id, 404);

        $wasKeyImage = $media->collection === 'key_image';
        $this->mediaCleaner->purgeMedia($media);
        $media->delete();

        if ($wasKeyImage) {
            $event->update(['image' => null]);
        }

        return response()->json(null, 204);
    }
}