import paramiko
import os
from subprocess import list2cmdline


def connection_from_config(name):
    """Create a connection from a Host entry in the .ssh/config file"""
    config = paramiko.config.SSHConfig()
    cp = os.path.expanduser("~/.ssh/config")
    with open(cp) as file:
        config.parse(file)
    info = config.lookup(name)
    info["username"] = info.pop("user")
    info["key_filename"] = info.pop("identityfile")
    info["port"] = int(info["port"])
    client = paramiko.client.SSHClient()
    client.load_host_keys(os.path.expanduser("~/.ssh/known_hosts"))
    client.connect(**info)
    return client


def scp_put(connection: paramiko.sftp_client.SFTPClient, src, dst):
    """Function to copy files from src to dst using connection (local to remote)"""
    connection.put(src, dst)


def scp_get(connection: paramiko.sftp_client.SFTPClient, src, dst):
    """Function to copy files from src to dst using connection (remote to local)"""
    connection.get(src, dst)


def exec_remote(connection: paramiko.SSHClient, command):
    """Function to execute specified command on conection"""
    if not isinstance(command, str):
        command = list2cmdline(command)
    stdin, stdout, stderr = connection.exec_command(command)
    return stdout, stderr