<?php

namespace App\Traits;

use Illuminate\Http\UploadedFile;
use InvalidArgumentException;
use RuntimeException;

trait Base64ToFile
{
    /**
     * Convert a base64 string to a file
     *
     * @param string $base64String The base64 encoded string
     * @param string $fileName Optional filename (without extension)
     * @return UploadedFile
     * @throws InvalidArgumentException If the base64 string is invalid
     * @throws RuntimeException If file creation fails
     */
    protected function convertBase64ToFile(string $base64String, ?string $fileName = null): UploadedFile
    {
        if (!preg_match('/^data:([^;]+);base64,(.+)$/', $base64String, $matches)) {
            throw new InvalidArgumentException('Invalid base64 string format');
        }

        $mimeType = $matches[1];
        $base64Content = $matches[2];

        $fileContent = base64_decode($base64Content, true);
        if ($fileContent === false) {
            throw new InvalidArgumentException('Failed to decode base64 content');
        }

        $extension = $this->getExtensionFromMimeType($mimeType);

        $fileName = $fileName ?? uniqid('file_', true);
        $fullFileName = "{$fileName}.{$extension}";

        $tempPath = sys_get_temp_dir() . '/' . $fullFileName;
        if (file_put_contents($tempPath, $fileContent) === false) {
            throw new RuntimeException('Failed to create temporary file');
        }

        return new UploadedFile(
            $tempPath,
            $fullFileName,
            $mimeType,
            null,
            true
        );
    }

    /**
     * Get file extension from mime type
     *
     * @param string $mimeType
     * @return string
     */
    private function getExtensionFromMimeType(string $mimeType): string
    {
        $mimeToExt = [
            'image/jpeg' => 'jpg',
            'image/png' => 'png',
            'image/gif' => 'gif',
            'application/pdf' => 'pdf',
            'text/plain' => 'txt',
            'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' => 'xlsx',
            'application/vnd.openxmlformats-officedocument.wordprocessingml.document' => 'docx',
            'application/vnd.ms-excel' => 'xls',
        ];

        return $mimeToExt[$mimeType] ?? 'bin';
    }
}