<?php

namespace App\Set\UseCases\UpdateSet;

use App\Exceptions\BadRequestException;
use App\Exceptions\NotFoundException;
use App\Set\Set;
use App\Set\SetRepository;
use App\Shared\Files\FileToUpload;
use App\Shared\Files\Filesystem;

class UpdateSet
{
    private const ALLOWED_MIME_TYPES = [
        'image/jpeg',
        'image/png',
        'image/webp',
    ];

    private const MAX_SIZE_BYTES = 5 * 1024 * 1024;

    public function __construct(
        private SetRepository $setRepository,
        private Filesystem $filesystem,
    ) {
    }

    /**
     * @throws BadRequestException
     * @throws NotFoundException
     */
    public function execute(UpdateSetRequest $request): Set
    {
        if ($request->id === null) {
            throw new BadRequestException('setId is required');
        }
        if ($request->name === null || $request->name === '') {
            throw new BadRequestException('name is required');
        }
        if (
            $request->description === null
            || $request->description === ''
        ) {
            throw new BadRequestException('description is required');
        }

        $set = $this->setRepository->find($request->id);
        if ($set === null) {
            throw new NotFoundException('Set not found');
        }

        $oldIconImageUrl = $set->getIconImageUrl();
        $newIconImageUrl = $this->iconImageUrl($request, $oldIconImageUrl);

        $set->setName($request->name);
        $set->setDescription($request->description);
        $set->setIconImageUrl($newIconImageUrl);

        $updatedSet = $this->setRepository->update($set);
        if ($newIconImageUrl !== $oldIconImageUrl) {
            $this->deleteManagedSetIcon($oldIconImageUrl);
        }

        return $updatedSet;
    }

    /**
     * @throws BadRequestException
     */
    private function iconImageUrl(
        UpdateSetRequest $request,
        string $currentIconImageUrl,
    ): string {
        if (
            $request->iconImageContents === null
            && $request->iconImageOriginalName === null
            && $request->iconImageMimeType === null
            && $request->iconImageSizeBytes === null
        ) {
            return $currentIconImageUrl;
        }

        if (
            $request->iconImageContents === null
            || $request->iconImageOriginalName === null
            || $request->iconImageMimeType === null
            || $request->iconImageSizeBytes === null
        ) {
            throw new BadRequestException('icon image is required');
        }

        if (
            ! in_array(
                $request->iconImageMimeType,
                self::ALLOWED_MIME_TYPES,
                true,
            )
        ) {
            throw new BadRequestException(
                'icon image must be a jpeg, png or webp image',
            );
        }

        if ($request->iconImageSizeBytes > self::MAX_SIZE_BYTES) {
            throw new BadRequestException(
                'icon image must be 5MB or smaller',
            );
        }

        $iconImage = new FileToUpload(
            contents: $request->iconImageContents,
            originalName: $request->iconImageOriginalName,
            mimeType: $request->iconImageMimeType,
            sizeBytes: $request->iconImageSizeBytes,
        );

        return $this->filesystem->upload($iconImage, 'set-icons');
    }

    private function deleteManagedSetIcon(string $path): void
    {
        if (! str_starts_with($path, 'set-icons/')) {
            return;
        }

        $this->filesystem->delete($path);
    }
}