<?php

namespace App\Support;

abstract class AbstractProtocol
{
    /**
     * @var array 用户信息
     */
    protected $user;

    /**
     * @var array 服务器信息
     */
    protected $servers;

    /**
     * @var string|null 客户端名称
     */
    protected $clientName;

    /**
     * @var string|null 客户端版本
     */
    protected $clientVersion;

    /**
     * @var array 协议标识
     */
    public $flags = [];
    
    /**
     * @var array 协议需求配置
     */
    protected $protocolRequirements = [];

    /**
     * 构造函数
     *
     * @param array $user 用户信息
     * @param array $servers 服务器信息
     * @param string|null $clientName 客户端名称
     * @param string|null $clientVersion 客户端版本
     */
    public function __construct($user, $servers, $clientName = null, $clientVersion = null)
    {
        $this->user = $user;
        $this->servers = $servers;
        $this->clientName = $clientName;
        $this->clientVersion = $clientVersion;
        
        // 服务器过滤逻辑
        $this->servers = $this->filterServersByVersion();
    }

    /**
     * 获取协议标识
     *
     * @return array
     */
    public function getFlags(): array
    {
        return $this->flags;
    }

    /**
     * 处理请求
     *
     * @return mixed
     */
    abstract public function handle();
    
    /**
     * 根据客户端版本过滤不兼容的服务器
     *
     * @return array
     */
    protected function filterServersByVersion()
    {
        // 如果没有客户端信息，直接返回所有服务器
        if (empty($this->clientName) || empty($this->clientVersion)) {
            return $this->servers;
        }

        // 检查当前客户端是否有特殊配置
        if (!isset($this->protocolRequirements[$this->clientName])) {
            return $this->servers;
        }

        return collect($this->servers)->filter(function ($server) {
            return $this->isCompatible($server);
        })->values()->all();
    }

    /**
     * 检查服务器是否与当前客户端兼容
     *
     * @param array $server 服务器信息
     * @return bool
     */
    protected function isCompatible($server)
    {
        $serverType = $server['type'] ?? null;
        // 如果该协议没有特定要求，则认为兼容
        if (!isset($this->protocolRequirements[$this->clientName][$serverType])) {
            
            return true;
        }
        
        $requirements = $this->protocolRequirements[$this->clientName][$serverType];
        
        // 检查每个路径的版本要求
        foreach ($requirements as $path => $valueRequirements) {
            $actualValue = data_get($server, $path);
            
            if ($actualValue === null) {
                continue;
            }
            
            if (isset($valueRequirements[$actualValue])) {
                $requiredVersion = $valueRequirements[$actualValue];
                if (version_compare($this->clientVersion, $requiredVersion, '<')) {
                    return false;
                }
            }
        }
        
        return true;
    }
}