// Channel管理（辅助模块）
// 管理ssh2::Channel生命周期和路由

use anyhow::Result;
use ssh2::Channel;
use log::{info, debug};

/// Channel Manager
pub struct ChannelManager {
    channel: Channel,
}

impl ChannelManager {
    pub fn new(channel: Channel) -> Self {
        Self { channel }
    }
    
    /// 读取数据
    pub fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
        let len = self.channel.read(buf)?;
        debug!("Read {} bytes from channel", len);
        Ok(len)
    }
    
    /// 写入数据
    pub fn write(&mut self, data: &[u8]) -> Result<()> {
        self.channel.write_all(data)?;
        debug!("Write {} bytes to channel", data.len());
        Ok(())
    }
    
    /// 读取字符串
    pub fn read_string(&mut self) -> Result<String> {
        let mut buf = String::new();
        self.channel.read_to_string(&mut buf)?;
        debug!("Read string: {} bytes", buf.len());
        Ok(buf)
    }
    
    /// 发送EOF
    pub fn send_eof(&mut self) -> Result<()> {
        self.channel.send_eof()?;
        info!("Sent EOF to channel");
        Ok(())
    }
    
    /// 等待EOF
    pub fn wait_eof(&mut self) -> Result<()> {
        self.channel.wait_eof()?;
        info!("Wait EOF completed");
        Ok(())
    }
    
    /// 关闭channel
    pub fn close(&mut self) -> Result<()> {
        self.channel.close()?;
        info!("Channel closed");
        Ok(())
    }
    
    /// 等待关闭
    pub fn wait_close(&mut self) -> Result<()> {
        self.channel.wait_close()?;
        info!("Channel wait close completed");
        Ok(())
    }
}