# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

import sys
from typing import List, Optional, Union

#
from twisted.conch.ssh.transport import SSHCiphers, SSHClientTransport
from twisted.python import usage


class ConchOptions(usage.Options):

    optParameters: List[List[Optional[Union[str, int]]]] = [
        ["user", "l", None, "Log in using this user name."],
        ["identity", "i", None],
        ["ciphers", "c", None],
        ["macs", "m", None],
        ["port", "p", None, "Connect to this port.  Server must be on the same port."],
        ["option", "o", None, "Ignored OpenSSH options"],
        ["host-key-algorithms", "", None],
        ["known-hosts", "", None, "File to check for host keys"],
        ["user-authentications", "", None, "Types of user authentications to use."],
        ["logfile", "", None, "File to log to, or - for stdout"],
    ]

    optFlags = [
        ["version", "V", "Display version number only."],
        ["compress", "C", "Enable compression."],
        ["log", "v", "Enable logging (defaults to stderr)"],
        ["nox11", "x", "Disable X11 connection forwarding (default)"],
        ["agent", "A", "Enable authentication agent forwarding"],
        ["noagent", "a", "Disable authentication agent forwarding (default)"],
        ["reconnect", "r", "Reconnect to the server if the connection is lost."],
    ]

    compData = usage.Completions(
        mutuallyExclusive=[("agent", "noagent")],
        optActions={
            "user": usage.CompleteUsernames(),
            "ciphers": usage.CompleteMultiList(
                [v.decode() for v in SSHCiphers.cipherMap.keys()],
                descr="ciphers to choose from",
            ),
            "macs": usage.CompleteMultiList(
                [v.decode() for v in SSHCiphers.macMap.keys()],
                descr="macs to choose from",
            ),
            "host-key-algorithms": usage.CompleteMultiList(
                [v.decode() for v in SSHClientTransport.supportedPublicKeys],
                descr="host key algorithms to choose from",
            ),
            # "user-authentications": usage.CompleteMultiList(?
            # descr='user authentication types' ),
        },
        extraActions=[
            usage.CompleteUserAtHost(),
            usage.Completer(descr="command"),
            usage.Completer(descr="argument", repeat=True),
        ],
    )

    def __init__(self, *args, **kw):
        usage.Options.__init__(self, *args, **kw)
        self.identitys = []
        self.conns = None

    def opt_identity(self, i):
        """Identity for public-key authentication"""
        self.identitys.append(i)

    def opt_ciphers(self, ciphers):
        "Select encryption algorithms"
        ciphers = ciphers.split(",")
        for cipher in ciphers:
            if cipher not in SSHCiphers.cipherMap:
                sys.exit("Unknown cipher type '%s'" % cipher)
        self["ciphers"] = ciphers

    def opt_macs(self, macs):
        "Specify MAC algorithms"
        if isinstance(macs, str):
            macs = macs.encode("utf-8")
        macs = macs.split(b",")
        for mac in macs:
            if mac not in SSHCiphers.macMap:
                sys.exit("Unknown mac type '%r'" % mac)
        self["macs"] = macs

    def opt_host_key_algorithms(self, hkas):
        "Select host key algorithms"
        if isinstance(hkas, str):
            hkas = hkas.encode("utf-8")
        hkas = hkas.split(b",")
        for hka in hkas:
            if hka not in SSHClientTransport.supportedPublicKeys:
                sys.exit("Unknown host key type '%r'" % hka)
        self["host-key-algorithms"] = hkas

    def opt_user_authentications(self, uas):
        "Choose how to authenticate to the remote server"
        if isinstance(uas, str):
            uas = uas.encode("utf-8")
        self["user-authentications"] = uas.split(b",")


#    def opt_compress(self):
#        "Enable compression"
#        self.enableCompression = 1
#        SSHClientTransport.supportedCompressions[0:1] = ['zlib']