<?php

namespace App\Support;

use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;

/**
 * Canonical short-link URLs for the Ladill platform (ladl.link).
 */
final class LadillLink
{
    public const INTERNAL_HEADER = 'X-Ladill-Internal';

    public static function baseUrl(): string
    {
        $domain = (string) config('link.public_domain', 'ladl.link');

        return 'https://'.$domain;
    }

    public static function url(string $slug): string
    {
        return rtrim(self::baseUrl(), '/').'/'.ltrim($slug, '/');
    }

    public static function path(string $slug, string $suffix): string
    {
        return self::url($slug).'/'.ltrim($suffix, '/');
    }

    public static function isInternalRequest(Request $request): bool
    {
        return $request->header(self::INTERNAL_HEADER) === '1';
    }

    public static function legacyRedirect(Request $request): RedirectResponse
    {
        $shortCode = $request->route('shortCode');
        if (! is_string($shortCode) || $shortCode === '') {
            abort(404);
        }

        $path = ltrim($request->path(), '/');
        $prefix = 'q/'.$shortCode;
        $suffix = '';
        if ($path !== $prefix && str_starts_with($path, $prefix.'/')) {
            $suffix = substr($path, strlen($prefix) + 1);
        }

        $target = $suffix === '' ? self::url($shortCode) : self::path($shortCode, $suffix);
        if ($qs = $request->getQueryString()) {
            $target .= '?'.$qs;
        }

        $status = in_array($request->method(), ['GET', 'HEAD'], true) ? 301 : 307;

        return redirect()->away($target, $status);
    }
}