<?php

namespace App\Services\GatewayWorker;

use GatewayClient\Gateway;

class GatewayClientService
{

    // 单例
    private static $instance;
    public static function getInstance(): self
    {
        if (!self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function init()
    {
//        ds(Gateway::$registerAddress = config('gateway.register_address'));
        Gateway::$registerAddress = config('gateway.register_address');
        ds(Gateway::getAllUidCount());
        return $this;
    }

    /**
     * 绑定用户ID和客户端ID
     */
    public function bindUser(string $clientId, int $userId): void
    {
        Gateway::bindUid($clientId, $userId);
    }

    /**
     * 根据用户ID获取客户端ID列表
     */
    public function getClientIdsByUserId(int $userId): array
    {
        return Gateway::getClientIdByUid($userId) ?: [];
    }

    /**
     * 加入聊天（绑定用户并可选加入分组）
     */
    public function joinChat(string $clientId, int $userId, ?string $group = null): void
    {
        $this->bindUser($clientId, $userId);

        if ($group) {
            Gateway::joinGroup($clientId, $group);
        }
    }

    /**
     * 构建标准化消息
     */
    protected function buildMessage(int $userId, string $name, string $text, string $type = 'received'): string
    {
        $message = [
            'userId'    => $userId,
            'name'      => $name,
            'text'      => $text,
            'timestamp' => date('Y-m-d\TH:i:sP'), // ISO 8601格式时间
            'type'      => $type
        ];

        return json_encode($message);
    }

    /**
     * 发送消息给指定用户
     */
    public function sendToUser(int $toUserId, int $fromUserId, string $fromUserName, string $text): void
    {
        $message = $this->buildMessage($fromUserId, $fromUserName, $text);
        Gateway::sendToUid($toUserId, $message);
    }

    /**
     * 广播消息给所有用户（可排除指定用户）
     */
    public function broadcastMessage(int $fromUserId, string $fromUserName, string $text, ?int $excludeUserId = null): void
    {
        $message = $this->buildMessage($fromUserId, $fromUserName, $text);

        $excludeList = $excludeUserId ? [$excludeUserId] : [];
        Gateway::sendToAll($message, null, $excludeList);
    }

    /**
     * 发送消息到指定分组
     */
    public function sendToGroup(string $group, int $fromUserId, string $fromUserName, string $text, ?int $excludeUserId = null): void
    {
        $message = $this->buildMessage($fromUserId, $fromUserName, $text);

        $excludeClientIds = [];
        if ($excludeUserId) {
            $excludeClientIds = $this->getClientIdsByUserId($excludeUserId);
        }

        Gateway::sendToGroup($group, $message, $excludeClientIds);
    }

    /**
     * 发送系统消息
     */
    public function sendSystemMessage(string $text, $target = null): void
    {
        $message = $this->buildMessage(0, 'System', $text, 'system');

        if (is_int($target)) {
            // 发送给特定用户
            Gateway::sendToUid($target, $message);
        } elseif (is_string($target)) {
            // 发送到分组
            Gateway::sendToGroup($target, $message);
        } else {
            // 全局广播
            Gateway::sendToAll($message);
        }
    }
}