<?php

namespace App\Services;

use App\Models\File;
use Exception;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use RecursiveIteratorIterator;
use RuntimeException;
use ZipArchive;

class FileService
{
    /**
     * @param $path
     * @param $file
     * @return File
     */
    public function saveUploadedFile($path, $file): File
    {
        $originalName = $this->sanitizeOriginalName((string)$file->getClientOriginalName());
        $storedFilename = $this->buildStoredFilename($originalName);
        $relativePath = $this->buildUniquePath($path, $storedFilename);
        try {
            Storage::disk('public')->put($relativePath, $file->getContent());
        } catch (\Throwable $e) {
            throw new RuntimeException('Не удалось сохранить файл. Проверьте имя файла и повторите попытку.', 0, $e);
        }

        return File::query()->create([
            'link' => url('/storage/' . $relativePath),
            'path' => $relativePath,
            'user_id' => auth()->user()->id,
            'original_name' => $originalName,
            'mime_type' => $file->getClientMimeType(),
        ]);
    }

    private function sanitizeOriginalName(string $originalName): string
    {
        $name = basename(str_replace('\\', '/', $originalName));
        if (class_exists('\Normalizer')) {
            $normalized = \Normalizer::normalize($name, \Normalizer::FORM_C);
            if (is_string($normalized)) {
                $name = $normalized;
            }
        }

        // Remove control/format unicode symbols (e.g. zero-width, LRM/RLM), then normalize spaces.
        $name = preg_replace('/\p{C}+/u', '', $name) ?? '';
        $name = preg_replace('/\p{Z}+/u', ' ', $name) ?? '';
        $name = trim($name);

        return $name === '' ? 'file' : $name;
    }

    private function buildStoredFilename(string $originalName): string
    {
        $baseName = pathinfo($originalName, PATHINFO_FILENAME);
        $extension = pathinfo($originalName, PATHINFO_EXTENSION);

        $baseName = preg_replace('/[<>:|?*\/\\\\]+/u', '_', $baseName) ?? '';
        $baseName = preg_replace('/\s+/u', ' ', $baseName) ?? '';
        $baseName = trim($baseName, " .\t\n\r\0\x0B");

        if ($baseName === '' || $baseName === '.' || $baseName === '..') {
            $baseName = 'file';
        }

        if (function_exists('mb_substr')) {
            $baseName = mb_substr($baseName, 0, 150);
        } else {
            $baseName = substr($baseName, 0, 150);
        }

        $extension = preg_replace('/[^A-Za-z0-9]+/', '', $extension) ?? '';

        return $extension === '' ? $baseName : $baseName . '.' . $extension;
    }

    private function buildUniquePath(string $directory, string $filename): string
    {
        $directory = trim($directory, '/');
        $basePath = $directory === '' ? $filename : $directory . '/' . $filename;

        if (!Storage::disk('public')->exists($basePath)) {
            return $basePath;
        }

        $baseName = pathinfo($filename, PATHINFO_FILENAME);
        $extension = pathinfo($filename, PATHINFO_EXTENSION);

        for ($index = 1; $index < 10000; $index++) {
            $candidateName = $baseName . ' (' . $index . ')';
            if ($extension !== '') {
                $candidateName .= '.' . $extension;
            }

            $candidatePath = $directory === '' ? $candidateName : $directory . '/' . $candidateName;
            if (!Storage::disk('public')->exists($candidatePath)) {
                return $candidatePath;
            }
        }

        return $basePath;
    }


    /**
     * @param string $path
     * @param string $archiveName
     * @param int|null $userId
     * @return File
     * @throws Exception
     */
    public function createZipArchive(string $path, string $archiveName, int $userId = null): File
    {

        if (!($tempFile = tempnam(sys_get_temp_dir(), Str::random()))) {
            throw new Exception('Cant create temporary file!');
        }

        $zip = new ZipArchive();
        $fullPath = storage_path('app/public/' . $path);
        $zip->open($tempFile, ZipArchive::CREATE | ZipArchive::OVERWRITE);
        $files = new RecursiveIteratorIterator(
            new \RecursiveDirectoryIterator($fullPath),
            RecursiveIteratorIterator::LEAVES_ONLY
        );
        foreach ($files as $file) {
            $filePath = $file->getRealPath();
            $relativePath = substr($filePath, strlen($fullPath) + 1);
            if(!$file->isDir()) {
                $zip->addFile($filePath, $relativePath);
            } else {
                $zip->addEmptyDir($relativePath);
            }
        }
        $zip->close();

        $fileModel = File::query()->updateOrCreate([
            'link' => url('/storage/') . '/' . Str::replace('/tmp', '', $path) . '/' .$archiveName,
            'path' => $path . '/' .$archiveName,
            'user_id' => $userId ?? auth()->user()->id,
            'original_name' => $archiveName,
            'mime_type' => 'application/zip',
        ]);
        $contents = file_get_contents($tempFile);
        Storage::disk('public')->put($path . '/../' .$archiveName, $contents);
        unlink($tempFile);

        return $fileModel;
    }


}