<?php

namespace App\Support;

use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use Symfony\Component\HttpFoundation\Response;

class DownloadFile
{
    /**
     * Create a download response with UTF-8 filename support.
     */
    public static function fromDisk(
        string $disk,
        string $path,
        string $downloadName,
        array $headers = []
    ): Response {
        $safeName = static::asciiFallbackFilename($downloadName);
        $response = Storage::disk($disk)->download($path, $safeName, $headers);
        $response->headers->set('Content-Disposition', static::contentDisposition($downloadName));

        return $response;
    }

    /**
     * Build RFC 5987 compatible Content-Disposition value.
     */
    public static function contentDisposition(
        string $downloadName,
        string $type = 'attachment'
    ): string {
        $safeOriginalName = static::sanitizeHeaderFilename($downloadName);
        $safeFallback = addcslashes(static::asciiFallbackFilename($safeOriginalName), "\"\\");
        $encoded = rawurlencode($safeOriginalName);

        return "{$type}; filename=\"{$safeFallback}\"; filename*=UTF-8''{$encoded}";
    }

    /**
     * Generate ASCII fallback filename for old clients.
     */
    public static function asciiFallbackFilename(string $filename): string
    {
        $filename = static::sanitizeHeaderFilename($filename);
        $extension = pathinfo($filename, PATHINFO_EXTENSION);
        $basename = pathinfo($filename, PATHINFO_FILENAME);

        $asciiBase = Str::ascii($basename);
        $asciiBase = preg_replace('/[^A-Za-z0-9._-]+/', '_', (string) $asciiBase);
        $asciiBase = trim((string) $asciiBase, '._-');
        if ($asciiBase === '') {
            $asciiBase = 'download';
        }

        $asciiExtension = Str::ascii((string) $extension);
        $asciiExtension = preg_replace('/[^A-Za-z0-9]+/', '', (string) $asciiExtension);

        return $asciiExtension === ''
            ? $asciiBase
            : "{$asciiBase}.{$asciiExtension}";
    }

    private static function sanitizeHeaderFilename(string $filename): string
    {
        $filename = str_replace(["\r", "\n"], '', trim($filename));

        return $filename !== '' ? $filename : 'download';
    }
}