package services

import "strings"

// FormatSSHError 将底层 SSH 错误翻译为中文友好提示，便于用户排查
func FormatSSHError(err error) string {
	if err == nil {
		return ""
	}
	msg := err.Error()
	lower := strings.ToLower(msg)

	switch {
	case strings.Contains(lower, "i/o timeout") ||
		strings.Contains(lower, "deadline exceeded") ||
		strings.Contains(lower, "connection timed out"):
		return "连接超时，请检查主机网络或 SSH 端口是否可达"
	case strings.Contains(lower, "connection refused"):
		return "连接被拒绝，目标端口未开放或 SSH 服务未运行"
	case strings.Contains(lower, "no such host") ||
		strings.Contains(lower, "no route to host"):
		return "无法解析或到达目标主机，请检查 IP 地址"
	case strings.Contains(lower, "permission denied") ||
		strings.Contains(lower, "unable to authenticate") ||
		strings.Contains(lower, "handshake") ||
		strings.Contains(lower, "password"):
		return "认证失败，请检查用户名、密码或 SSH 密钥"
	case strings.Contains(lower, "no supported methods"):
		return "SSH 协商失败，服务端未支持当前认证方式"
	default:
		return msg
	}
}