<?php

namespace App\Http\Controllers;

use App\Models\Proxy;
use Illuminate\Http\Response;

class PacFileController extends Controller
{
    public function generate()
    {
        // Get active proxies from the database
        $proxies = Proxy::where('is_active', true)
            ->orderBy('score', 'desc')
            ->limit(10)
            ->get();

        // Generate PAC file content
        $pacContent = $this->generatePacContent($proxies);

        // Return the PAC file with proper headers
        return response($pacContent)
            ->header('Content-Type', 'application/x-ns-proxy-autoconfig')
            ->header('Content-Disposition', 'attachment; filename="proxy.pac"');
    }

    protected function generatePacContent($proxies)
    {
        // Start with the PAC file header
        $content = "function FindProxyForURL(url, host) {\n";
        $content .= "    // List of proxy servers\n";
        $content .= "    var proxyList = [\n";

        // Add proxy servers to the list
        foreach ($proxies as $proxy) {
            $content .= "        'PROXY {$proxy->ip}:{$proxy->port}',\n";
        }

        // Add fallback to DIRECT if no proxies are available
        $content .= "        'DIRECT'\n";
        $content .= "    ];\n\n";

        // Add proxy selection logic
        $content .= "    // Don't proxy localhost\n";
        $content .= "    if (isPlainHostName(host) ||\n";
        $content .= "        shExpMatch(host, '*.local') ||\n";
        $content .= "        isInNet(dnsResolve(host), '10.0.0.0', '255.0.0.0') ||\n";
        $content .= "        isInNet(dnsResolve(host), '172.16.0.0', '255.240.0.0') ||\n";
        $content .= "        isInNet(dnsResolve(host), '192.168.0.0', '255.255.0.0') ||\n";
        $content .= "        isInNet(dnsResolve(host), '127.0.0.0', '255.0.0.0'))\n";
        $content .= "        return 'DIRECT';\n\n";

        // Add proxy selection based on URL
        $content .= "    // Use proxy for all other URLs\n";
        $content .= "    return proxyList.join('; ');\n";
        $content .= "}\n";

        return $content;
    }
}