<?php

namespace App\Classes\Service\Files;

use Illuminate\Support\Facades\Storage;
use App\Classes\Constants;

class Base64Uploader
{
    public function execute( string $path, ?string $base64) : ?string {
		
		if($base64 !== null){
			
			$type = $this->getFileType($base64);
			
			$extension = $this->getExtension($base64, $type);
			
			$uniqueName = uniqid().time();
			
			$imagePath = $path.'/'.$uniqueName.'.'.$extension;
			
			$encodedExtension = $extension;
			
			if($extension === Constants::EXCEL_FILE_EXTENSION){
				$encodedExtension = Constants::EXCEL_FILE_ENCODED_EXTENSION;
			}

            $data = base64_decode(str_replace(' ', '+', str_replace('data:'.$type.'/'.$encodedExtension.';base64,', '', $base64)));

			
			Storage::disk('public')->put($imagePath, $data);
			
			return $uniqueName.'.'.$extension;
			
		}

		return null;
		
    }
	
	private function getFileType(string $base64){
		return explode('/', explode(':', substr($base64, 0, strpos($base64, ';')))[1])[0];
	}
	
	private function getExtension(string $base64, string $type) {
		$extension = explode('/', explode(':', substr($base64, 0, strpos($base64, ';')))[1])[1];
		
		if($extension === Constants::EXCEL_FILE_ENCODED_EXTENSION){
			return Constants::EXCEL_FILE_EXTENSION;
		}
		
		return $extension;
	}
}