using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using AuroraDesk.Core.Entities;

namespace AuroraDesk.Core.Interfaces;

/// <summary>
/// 管理 SSH 会话的服务接口，支持多客户端并行连接与实时消息流
/// </summary>
public interface ISshSessionService : IDisposable
{
    /// <summary>
    /// 创建并启动一个新的 SSH 会话
    /// </summary>
    /// <param name="options">会话参数</param>
    /// <param name="cancellationToken">取消令牌</param>
    /// <returns>会话信息</returns>
    Task<SshSessionInfo> StartSessionAsync(SshSessionOptions options, CancellationToken cancellationToken = default);

    /// <summary>
    /// 停止并释放指定会话
    /// </summary>
    /// <param name="sessionId">会话标识</param>
    Task StopSessionAsync(Guid sessionId);

    /// <summary>
    /// 向指定会话发送命令或文本
    /// </summary>
    /// <param name="sessionId">会话标识</param>
    /// <param name="payload">要发送的内容</param>
    /// <param name="cancellationToken">取消令牌</param>
    Task<bool> SendAsync(Guid sessionId, string payload, CancellationToken cancellationToken = default);

    /// <summary>
    /// 获取所有当前会话的快照
    /// </summary>
    IReadOnlyCollection<SshSessionInfo> GetSessions();

    /// <summary>
    /// 监听指定会话的状态变化
    /// </summary>
    IObservable<SshSessionStatus> ObserveStatus(Guid sessionId);

    /// <summary>
    /// 监听指定会话的消息流（包含发送与接收）
    /// </summary>
    IObservable<SshMessage> ObserveMessages(Guid sessionId);
}