<?php

namespace App\Lib;

use App\Exceptions\CafelApiImageFetchException;
use Illuminate\Http\File;
use Illuminate\Support\Facades\File as FacadesFile;
use SplFileInfo;
use Symfony\Component\Mime\MimeTypes;

class FileHelper
{
    /**
     * Generate from blob
     *
     * @param string      $mimeType
     * @param string      $blob
     * @param string|null $fileName
     * @return SplFileInfo
     * @throws \ErrorException If writing to temp file failed.
     */
    public static function fromBlob(string $mimeType, string $blob, string $fileName = null): SplFileInfo
    {
        // * Create temp file and get its absolute path
        if (!($tempFile = tmpfile())) {
            new \ErrorException('Could not create temp file');
        }
        $tempFilePath = stream_get_meta_data($tempFile)['uri'];

        // * Save file data in file
        if (!(file_put_contents($tempFilePath, $blob))) {
            new \ErrorException('Could not write on temp file');
        }

        $tempFileObject = new File($tempFilePath);
        $filePath       = $fileName ?? $tempFileObject->getFilename();
        $mimeType       = $tempFileObject->getMimeType() ?? $mimeType;
        $extension      = collect((new MimeTypes())->getExtensions($mimeType))->first();

        if (!FacadesFile::put(\storage_path("tmp/$filePath.$extension"), $blob)) {
            new \ErrorException('Could not write on temp file');
        }

        // Close this file after response is sent.
        // Closing the file will cause to remove it from temp director!
        app()->terminating(function () use ($tempFile) {
            fclose($tempFile);
        });

        return new SplFileInfo(\storage_path("tmp/$filePath.$extension"));
    }

    /**
     * Generate from blob
     *
     * @param string $fileName
     * @param string $extension
     * @param string $base64String
     * @return SplFileInfo
     * @throws \ErrorException If writing to temp file failed.
     * @throws \App\Exceptions\CafelApiImageFetchException If invalid image was given or ext could not be confirmed.
     */
    public static function fromBase64(string $fileName, string $extension, string $base64String): SplFileInfo
    {
        // * Create temp file and get its absolute path
        if (!($tempFile = tmpfile())) {
            new \ErrorException('Could not create temp file');
        }
        $tempFilePath = stream_get_meta_data($tempFile)['uri'];

        if (!($blob = \base64_decode($base64String, true))) {
            throw new CafelApiImageFetchException("Invalid base64 string given for image '$fileName'");
        }

        // * Save file data in file
        if (!(file_put_contents($tempFilePath, $blob))) {
            throw new \ErrorException('Could not write on temp file');
        }

        $tempFileObject = new File($tempFilePath);
        $filePath       = $fileName ?? $tempFileObject->getFilename();
        $mimeType       = $tempFileObject->getMimeType();
        $guessedExt     = $mimeType ? collect((new MimeTypes())->getExtensions($mimeType))->first() : $extension;

        // * Ignore jpeg that is guessed as jpg
        if ($guessedExt !== $extension and !($extension === 'jpeg' && $guessedExt === 'jpg')) {
            throw new CafelApiImageFetchException(
                "Given extension '$extension' could not be confirmed, found '$guessedExt' for image '$fileName'"
            );
        }

        if (!FacadesFile::put(\storage_path("tmp/$filePath.$extension"), $blob)) {
            throw new \ErrorException('Could not write on temp file');
        }

        // Close this file after response is sent.
        // Closing the file will cause to remove it from temp director!
        app()->terminating(function () use ($tempFile) {
            fclose($tempFile);
        });

        return new SplFileInfo(\storage_path("tmp/$filePath.$extension"));
    }
}