<?php

namespace App\Http\Controllers;

use App\Models\ShareFile;
use App\Services\ShareService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use InvalidArgumentException;

class UploadChunkController extends Controller
{
    public function __construct(
        private ShareService $shareService,
    ) {}

    /**
     * Store one encrypted chunk of a file the uploader's page registered.
     *
     * Only the session that started the pending share may add to it. A chunk the server already
     * has is acknowledged without being written again; one that skips ahead gets a 409 with the
     * number of chunks stored, so the browser can continue from there.
     */
    public function store(Request $request, ShareFile $shareFile, int $index): JsonResponse
    {
        $share = $shareFile->share;

        abort_if($share->isCompleted() || ! in_array($share->token, $request->session()->get('pending_shares', []), true), 404);

        if ($index !== $shareFile->uploaded_chunks) {
            return response()->json(
                ['uploaded_chunks' => $shareFile->uploaded_chunks],
                $index < $shareFile->uploaded_chunks ? 200 : 409,
            );
        }

        try {
            $uploadedChunks = $this->shareService->storeChunk($shareFile, $index, $request->getContent());
        } catch (InvalidArgumentException) {
            abort(422, 'The chunk is invalid.');
        }

        return response()->json(['uploaded_chunks' => $uploadedChunks]);
    }
}