<?php

namespace App\Http\Controllers\Web;

use App\Http\Controllers\Controller;
use App\Models\ConversionHistory;
use Illuminate\Http\RedirectResponse;

class ShortLinkController extends Controller
{
    /**
     * Redirect short URL to the actual Shopee affiliate redirect URL.
     */
    public function redirect(string $code)
    {
        $history = ConversionHistory::whereRaw('BINARY code = ?', [$code])
            ->where('status', 'success')
            ->first();

        if (!$history || !$history->affiliate_url) {
            abort(404, 'Short link not found or invalid.');
        }

        // Detect if request is from a crawler bot (Zalo, Facebook, etc.)
        $userAgent = strtolower(request()->header('User-Agent', ''));
        $bots = ['zalo', 'facebookexternalhit', 'telegrambot', 'twitterbot', 'slackbot', 'googlebot', 'crawler'];
        $isBot = false;
        
        foreach ($bots as $bot) {
            if (str_contains($userAgent, $bot)) {
                $isBot = true;
                break;
            }
        }

        if ($isBot) {
            return view('short_link_preview', compact('history'));
        }

        // Increment click count for real users
        $history->increment('clicks');

        return redirect()->away($history->affiliate_url);
    }
}