<?php

namespace App\Protocols;

use App\Models\ServerHysteria;
use App\Utils\Helper;
use Symfony\Component\Yaml\Yaml;

class ClashMeta
{
    public $flag = 'meta,verge';
    private $servers;
    private $user;

    public function __construct($user, $servers, array $options = null)
    {
        $this->user = $user;
        $this->servers = $servers;
    }

    public function handle()
    {
        $servers = $this->servers;
        $user = $this->user;
        $appName = admin_setting('app_name', 'XBoard');
        $defaultConfig = base_path() . '/resources/rules/default.clash.yaml';
        $customConfig = base_path() . '/resources/rules/custom.clash.yaml';
        if (\File::exists($customConfig)) {
            $config = Yaml::parseFile($customConfig);
        } else {
            $config = Yaml::parseFile($defaultConfig);
        }
        $proxy = [];
        $proxies = [];

        foreach ($servers as $item) {
            if ($item['type'] === 'shadowsocks') {
                array_push($proxy, self::buildShadowsocks($user['uuid'], $item));
                array_push($proxies, $item['name']);
            }
            if ($item['type'] === 'vmess') {
                array_push($proxy, self::buildVmess($user['uuid'], $item));
                array_push($proxies, $item['name']);
            }
            if ($item['type'] === 'trojan') {
                array_push($proxy, self::buildTrojan($user['uuid'], $item));
                array_push($proxies, $item['name']);
            }
            if ($item['type'] === 'vless') {
                array_push($proxy, self::buildVless($user['uuid'], $item));
                array_push($proxies, $item['name']);
            }
            if ($item['type'] === 'hysteria') {
                array_push($proxy, self::buildHysteria($user['uuid'], $item, $user));
                array_push($proxies, $item['name']);
            }
        }

        $config['proxies'] = array_merge($config['proxies'] ? $config['proxies'] : [], $proxy);
        foreach ($config['proxy-groups'] as $k => $v) {
            if (!is_array($config['proxy-groups'][$k]['proxies'])) $config['proxy-groups'][$k]['proxies'] = [];
            $isFilter = false;
            foreach ($config['proxy-groups'][$k]['proxies'] as $src) {
                foreach ($proxies as $dst) {
                    if (!$this->isRegex($src)) continue;
                    $isFilter = true;
                    $config['proxy-groups'][$k]['proxies'] = array_values(array_diff($config['proxy-groups'][$k]['proxies'], [$src]));
                    if ($this->isMatch($src, $dst)) {
                        array_push($config['proxy-groups'][$k]['proxies'], $dst);
                    }
                }
                if ($isFilter) continue;
            }
            if ($isFilter) continue;
            $config['proxy-groups'][$k]['proxies'] = array_merge($config['proxy-groups'][$k]['proxies'], $proxies);
        }
        $config['proxy-groups'] = array_filter($config['proxy-groups'], function($group) {
            return $group['proxies'];
        });
        $config['proxy-groups'] = array_values($config['proxy-groups']);
        // Force the current subscription domain to be a direct rule
        $subsDomain = request()->header('Host');
        if ($subsDomain) {
            array_unshift($config['rules'], "DOMAIN,{$subsDomain},DIRECT");
        }

        $yaml = Yaml::dump($config, 2, 4, Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE);
        $yaml = str_replace('$app_name', admin_setting('app_name', 'XBoard'), $yaml);
        return response($yaml, 200)
            ->header('subscription-userinfo', "upload={$user['u']}; download={$user['d']}; total={$user['transfer_enable']}; expire={$user['expired_at']}")
            ->header('profile-update-interval', '24')
            ->header('content-disposition', 'attachment;filename*=UTF-8\'\'' . rawurlencode($appName));
    }

    public static function buildShadowsocks($password, $server)
    {
        if ($server['cipher'] === '2022-blake3-aes-128-gcm') {
            $serverKey = Helper::getServerKey($server['created_at'], 16);
            $userKey = Helper::uuidToBase64($password, 16);
            $password = "{$serverKey}:{$userKey}";
        }
        if ($server['cipher'] === '2022-blake3-aes-256-gcm') {
            $serverKey = Helper::getServerKey($server['created_at'], 32);
            $userKey = Helper::uuidToBase64($password, 32);
            $password = "{$serverKey}:{$userKey}";
        }
        $array = [];
        $array['name'] = $server['name'];
        $array['type'] = 'ss';
        $array['server'] = $server['host'];
        $array['port'] = $server['port'];
        $array['cipher'] = $server['cipher'];
        $array['password'] = $password;
        $array['udp'] = true;
        return $array;
    }

    public static function buildVmess($uuid, $server)
    {
        $array = [];
        $array['name'] = $server['name'];
        $array['type'] = 'vmess';
        $array['server'] = $server['host'];
        $array['port'] = $server['port'];
        $array['uuid'] = $uuid;
        $array['alterId'] = 0;
        $array['cipher'] = 'auto';
        $array['udp'] = true;

        if ($server['tls']) {
            $array['tls'] = true;
            if ($server['tlsSettings']) {
                $tlsSettings = $server['tlsSettings'];
                if (isset($tlsSettings['allowInsecure']) && !empty($tlsSettings['allowInsecure']))
                    $array['skip-cert-verify'] = ($tlsSettings['allowInsecure'] ? true : false);
                if (isset($tlsSettings['serverName']) && !empty($tlsSettings['serverName']))
                    $array['servername'] = $tlsSettings['serverName'];
            }
        }
        if ($server['network'] === 'tcp') {
            $tcpSettings = $server['networkSettings'];
            if (isset($tcpSettings['header']['type'])) $array['network'] = $tcpSettings['header']['type'];
            if (isset($tcpSettings['header']['request']['path'][0])) $array['http-opts']['path'] = $tcpSettings['header']['request']['path'][0];
        }
        if ($server['network'] === 'ws') {
            $array['network'] = 'ws';
            if ($server['networkSettings']) {
                $wsSettings = $server['networkSettings'];
                $array['ws-opts'] = [];
                if (isset($wsSettings['path']) && !empty($wsSettings['path']))
                    $array['ws-opts']['path'] = $wsSettings['path'];
                if (isset($wsSettings['headers']['Host']) && !empty($wsSettings['headers']['Host']))
                    $array['ws-opts']['headers'] = ['Host' => $wsSettings['headers']['Host']];
                if (isset($wsSettings['path']) && !empty($wsSettings['path']))
                    $array['ws-path'] = $wsSettings['path'];
                if (isset($wsSettings['headers']['Host']) && !empty($wsSettings['headers']['Host']))
                    $array['ws-headers'] = ['Host' => $wsSettings['headers']['Host']];
            }
        }
        if ($server['network'] === 'grpc') {
            $array['network'] = 'grpc';
            if ($server['networkSettings']) {
                $grpcSettings = $server['networkSettings'];
                $array['grpc-opts'] = [];
                if (isset($grpcSettings['serviceName'])) $array['grpc-opts']['grpc-service-name'] = $grpcSettings['serviceName'];
            }
        }

        return $array;
    }

    public static function buildVless($password, $server){
        $array = [];
        $array['name'] = $server['name'];
        $array['type'] = 'vless';
        $array['server'] = $server['host'];
        $array['port'] = $server['port'];
        $array['uuid'] = $password;
        $array['alterId'] = 0;
        $array['cipher'] = 'auto';
        $array['udp'] = true;

        // XTLS流控算法
        if($server['flow']) ($array['flow'] = $server['flow']);

        if ($server['tls']) {
            switch($server['tls']){
                case 1:  //开启TLS
                    $array['tls'] = true;
                    if ($server['tls_settings']) {
                        $tlsSettings = $server['tls_settings'];
                        if (isset($tlsSettings['allowInsecure']) && !empty($tlsSettings['allowInsecure']))
                            $array['skip-cert-verify'] = ($tlsSettings['allowInsecure'] ? true : false);
                        if (isset($tlsSettings['serverName']) && !empty($tlsSettings['serverName']))
                            $array['servername'] = $tlsSettings['serverName'];
                    }
                    break;
                case 2:  //开启reality
                    $array['tls'] = true;
                    $tls_settings = $server['tls_settings'];
                    if (!empty($tls_settings['allowInsecure'])) $array['skip-cert-verify'] = (bool)$tls_settings['allowInsecure'];

                    if(($tls_settings['public_key'] ?? null)
                    && ($tls_settings['short_id'] ?? null)
                    && ($tls_settings['server_name'] ?? null)){
                        $array['servername'] = $tls_settings['server_name'];
                        $array['reality-opts'] = [
                            'public-key' => $tls_settings['public_key'],
                            'short-id' => $tls_settings['short_id']
                        ];
                        $fingerprints = ['chrome', 'firefox', 'safari', 'ios', 'edge', 'qq']; //随机客户端指纹
                        $array['client-fingerprint'] = $fingerprints[rand(0,count($fingerprints) - 1)];
                    };
                    break;
            }
        }

        if ($server['network'] === 'ws') {
            $array['network'] = 'ws';
            if ($server['network_settings']) {
                $wsSettings = $server['network_settings'];
                $array['ws-opts'] = [];
                if (isset($wsSettings['path']) && !empty($wsSettings['path']))
                    $array['ws-opts']['path'] = $wsSettings['path'];
                if (isset($wsSettings['headers']['Host']) && !empty($wsSettings['headers']['Host']))
                    $array['ws-opts']['headers'] = ['Host' => $wsSettings['headers']['Host']];
                if (isset($wsSettings['path']) && !empty($wsSettings['path']))
                    $array['ws-path'] = $wsSettings['path'];
                if (isset($wsSettings['headers']['Host']) && !empty($wsSettings['headers']['Host']))
                    $array['ws-headers'] = ['Host' => $wsSettings['headers']['Host']];
            }
        }
        if ($server['network'] === 'grpc') {
            $array['network'] = 'grpc';
            if ($server['network_settings']) {
                $grpcSettings = $server['network_settings'];
                $array['grpc-opts'] = [];
                if (isset($grpcSettings['serviceName'])) {
                    $array['grpc-opts']['grpc-service-name'] = $grpcSettings['serviceName'];
                };
            }
        }

        return $array;
    }

    public static function buildTrojan($password, $server)
    {
        $array = [];
        $array['name'] = $server['name'];
        $array['type'] = 'trojan';
        $array['server'] = $server['host'];
        $array['port'] = $server['port'];
        $array['password'] = $password;
        $array['udp'] = true;
        if (!empty($server['server_name'])) $array['sni'] = $server['server_name'];
        if (!empty($server['allow_insecure'])) $array['skip-cert-verify'] = ($server['allow_insecure'] ? true : false);
        // trojan-go配置
        if(in_array($server['network'], ["grpc", "ws"])){
            $array['network'] = $server['network'];
            // grpc配置
            if($server['network'] === "grpc" && isset($server['networkSettings']['serviceName'])) $array['grpc-opts']['grpc-service-name'] = $server['networkSettings']['serviceName'];
            // ws配置
            if($server['network'] === "ws") {
                if(isset($server['networkSettings']['path'])) {
                    $array['ws-opts']['path'] = $server['networkSettings']['path'];
                }
                if(isset($server['networkSettings']['headers']['Host'])){
                    $array['ws-opts']['headers']['Host'] = $server['networkSettings']['headers']['Host'];
                }
            }
        };
        return $array;
    }

    public static function buildHysteria($password, $server, $user)
    {
        $array = [];
        $array['name'] = $server['name'];
        $array['server'] = $server['host'];
        $array['port'] = $server['port'];
        if($server['server_name']) $array['sni'] = $server['server_name'];
        $array['up'] = $user->speed_limit ? min($server['up_mbps'], $user->speed_limit) : $server['up_mbps'];
        $array['down'] = $user->speed_limit ? min($server['down_mbps'], $user->speed_limit) : $server['down_mbps'];
        $array['skip-cert-verify'] = $server['insecure'] ? true : false;
        switch($server['version']){
            case 1: 
                $array['type'] = 'hysteria';
                // 判断是否开启动态端口
                if(isset($server['ports'])) $array['ports'] = $server['ports'];
                $array['auth_str'] = $password;
                $array['protocol'] = 'udp';
                if($server['is_obfs']) $array['obfs'] = $server['server_key'];
                $array['fast-open'] = true;
                $array['disable_mtu_discovery'] = true; //禁止路径最大传输单元发现
                $array['alpn'] = [ServerHysteria::$alpnMap[$server['alpn']]];
                break;
            case 2: 
                $array['type'] = 'hysteria2';
                $array['password'] = $password;
                if($server['is_obfs']) {
                    $array['obfs'] = 'salamander';
                    $array['obfs-password'] = $server['server_key'];
                }
                break;
        }
        
        return $array;
    }

    private function isMatch($exp, $str)
    {
        return @preg_match($exp, $str);
    }

    private function isRegex($exp)
    {
        return @preg_match($exp, null) !== false;
    }
}
