<?php

namespace App\Http\Controllers\Transfer;

use App\Http\Controllers\Controller;
use App\Services\Upload\ChunkedUploadService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use RuntimeException;

class ChunkedUploadController extends Controller
{
    public function __construct(
        private ChunkedUploadService $uploads,
    ) {}

    public function init(Request $request): JsonResponse
    {
        $account = ladill_account();

        $validated = $request->validate([
            'filename' => 'required|string|max:255',
            'filesize' => 'required|integer|min:1',
        ]);

        $uploadId = $this->uploads->init($this->ownerKey($account->id), [
            'filename' => $validated['filename'],
            'filesize' => (int) $validated['filesize'],
        ]);

        return response()->json([
            'success' => true,
            'upload_id' => $uploadId,
        ]);
    }

    public function chunk(Request $request): JsonResponse
    {
        $account = ladill_account();
        $ownerKey = $this->ownerKey($account->id);

        $validated = $request->validate([
            'upload_id' => 'required|string|uuid',
            'chunk_index' => 'required|integer|min:0',
            'chunk_size' => 'required|integer|min:1',
            'chunk' => 'required|file|max:10240',
        ]);

        $chunk = $request->file('chunk');
        if ($chunk === null) {
            return response()->json(['success' => false, 'error' => 'Chunk missing.'], 422);
        }

        try {
            $received = $this->uploads->receiveChunk(
                $validated['upload_id'],
                $ownerKey,
                (int) $validated['chunk_index'],
                $chunk,
                (int) $validated['chunk_size'],
            );
        } catch (RuntimeException $e) {
            return response()->json(['success' => false, 'error' => $e->getMessage()], 400);
        }

        return response()->json([
            'success' => true,
            'chunk_index' => (int) $validated['chunk_index'],
            'chunks_received' => $received,
        ]);
    }

    public function finalize(Request $request): JsonResponse
    {
        $account = ladill_account();
        $ownerKey = $this->ownerKey($account->id);

        $validated = $request->validate([
            'upload_id' => 'required|string|uuid',
            'total_chunks' => 'required|integer|min:1',
        ]);

        try {
            $this->uploads->finalize(
                $validated['upload_id'],
                $ownerKey,
                (int) $validated['total_chunks'],
            );
        } catch (RuntimeException $e) {
            return response()->json(['success' => false, 'error' => $e->getMessage()], 400);
        }

        return response()->json([
            'success' => true,
            'upload_id' => $validated['upload_id'],
        ]);
    }

    private function ownerKey(int $userId): string
    {
        return 'user:'.$userId;
    }
}