<?php

namespace App\Element\UseCases\UpdateElement;

use App\Element\Element;
use App\Element\ElementRepository;
use App\Exceptions\BadRequestException;
use App\Exceptions\NotFoundException;
use App\Shared\Files\FileToUpload;
use App\Shared\Files\FileUploader;

class UpdatePdf
{
    private const ALLOWED_MIME_TYPES = [
        'application/pdf',
    ];

    private const MAX_SIZE_BYTES = 10 * 1024 * 1024;

    public function __construct(
        private ElementRepository $elementRepository,
        private FileUploader $fileUploader,
    ) {
    }

    /**
     * @throws BadRequestException
     * @throws NotFoundException
     */
    public function execute(UpdatePdfRequest $request): Element
    {
        if ($request->id === null) {
            throw new BadRequestException('id is required');
        }

        if (
            $request->pdfContents === null
            || $request->pdfOriginalName === null
            || $request->pdfMimeType === null
            || $request->pdfSizeBytes === null
        ) {
            throw new BadRequestException('pdf is required');
        }

        if (
            ! in_array(
                $request->pdfMimeType,
                self::ALLOWED_MIME_TYPES,
                true,
            )
        ) {
            throw new BadRequestException('pdf must be a pdf file');
        }

        if ($request->pdfSizeBytes > self::MAX_SIZE_BYTES) {
            throw new BadRequestException('pdf must be 10MB or smaller');
        }

        $element = $this->elementRepository->find($request->id);
        if ($element === null) {
            throw new NotFoundException('Element not found');
        }

        $pdf = new FileToUpload(
            contents: $request->pdfContents,
            originalName: $request->pdfOriginalName,
            mimeType: $request->pdfMimeType,
            sizeBytes: $request->pdfSizeBytes,
        );
        $path = $this->fileUploader->upload($pdf, 'element-pdfs');
        $element->setPdfPath($path);

        return $this->elementRepository->update($element);
    }
}