<?php

declare(strict_types=1);
namespace App\Services\Freenode;

use Symfony\Component\Yaml\Yaml;

final class Renderer
{
    public static function singbox(array $nodes): string
    {
        $tags = array_column($nodes, 'tag');
        $config = [
            'log' => ['level' => 'warn'],
            'dns' => ['servers' => [['type' => 'local', 'tag' => 'local']], 'final' => 'local'],
            'inbounds' => [
                ['type' => 'tun', 'tag' => 'tun-in', 'address' => ['172.19.0.1/30'], 'auto_route' => true, 'strict_route' => true],
                ['type' => 'mixed', 'tag' => 'mixed-in', 'listen' => '127.0.0.1', 'listen_port' => 7891],
            ],
            'outbounds' => array_merge([
                ['type' => 'selector', 'tag' => 'proxy', 'outbounds' => $tags ?: ['direct']],
                ['type' => 'direct', 'tag' => 'direct'],
            ], array_values($nodes)),
            'route' => ['rules' => [
                ['action' => 'sniff'],
                ['protocol' => 'dns', 'action' => 'hijack-dns'],
                ['ip_is_private' => true, 'action' => 'route', 'outbound' => 'direct'],
                ['rule_set' => ['geoip-cn', 'geosite-cn'], 'action' => 'route', 'outbound' => 'direct'],
            ], 'rule_set' => [
                ['tag' => 'geoip-cn', 'type' => 'remote', 'format' => 'binary', 'url' => 'https://fastly.jsdelivr.net/gh/SagerNet/sing-geoip@rule-set/geoip-cn.srs', 'download_detour' => 'direct'],
                ['tag' => 'geosite-cn', 'type' => 'remote', 'format' => 'binary', 'url' => 'https://fastly.jsdelivr.net/gh/SagerNet/sing-geosite@rule-set/geosite-cn.srs', 'download_detour' => 'direct'],
            ], 'final' => 'proxy', 'default_domain_resolver' => 'local', 'auto_detect_interface' => true],
        ];
        return json_encode($config, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_THROW_ON_ERROR);
    }

    public static function clash(array $nodes, ?array $template = null): string
    {
        if ($template !== null) {
            $template['proxies'] = array_values($nodes);
            $names = array_column($nodes, 'name');
            foreach ($template['proxy-groups'] as &$group) {
                if (!in_array($group['name'], ['🍃 应用净化', '🛑 全球拦截', '🎯 全球直连'], true)) {
                    $group['proxies'] = array_values(array_unique(array_merge($group['proxies'] ?? [], $names)));
                    if (!$group['proxies']) $group['proxies'] = ['DIRECT'];
                }
            }
            unset($group);
            return Yaml::dump($template, 12, 2, Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE);
        }
        return Yaml::dump([
            'mixed-port' => 7890, 'allow-lan' => false, 'mode' => 'rule', 'log-level' => 'warning',
            'proxies' => array_values($nodes),
            'proxy-groups' => [['name' => 'PROXY', 'type' => 'select', 'proxies' => array_column($nodes, 'name') ?: ['DIRECT']]],
            'rules' => ['IP-CIDR,10.0.0.0/8,DIRECT,no-resolve', 'IP-CIDR,172.16.0.0/12,DIRECT,no-resolve', 'IP-CIDR,192.168.0.0/16,DIRECT,no-resolve', 'MATCH,PROXY'],
        ], 12, 2, Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE);
    }
}