#! /usr/bin/env python
""" Starts a synapse client console. """

from twisted.internet import reactor, defer, threads
from http import TwistedHttpClient

import argparse
import cmd
import getpass
import json
import shlex
import sys
import time
import urllib
import urlparse

import nacl.signing
import nacl.encoding

from syutil.crypto.jsonsign import verify_signed_json, SignatureVerifyException

CONFIG_JSON = "cmdclient_config.json"

TRUSTED_ID_SERVERS = [
    'localhost:8001'
]

class SynapseCmd(cmd.Cmd):

    """Basic synapse command-line processor.

    This processes commands from the user and calls the relevant HTTP methods.
    """

    def __init__(self, http_client, server_url, identity_server_url, username, token):
        cmd.Cmd.__init__(self)
        self.http_client = http_client
        self.http_client.verbose = True
        self.config = {
            "url": server_url,
            "identityServerUrl": identity_server_url,
            "user": username,
            "token": token,
            "verbose": "on",
            "complete_usernames": "on",
            "send_delivery_receipts": "on"
        }
        self.path_prefix = "/matrix/client/api/v1"
        self.event_stream_token = "START"
        self.prompt = ">>> "

    def do_EOF(self, line):  # allows CTRL+D quitting
        return True

    def emptyline(self):
        pass  # else it repeats the previous command

    def _usr(self):
        return self.config["user"]

    def _tok(self):
        return self.config["token"]

    def _url(self):
        return self.config["url"] + self.path_prefix

    def _identityServerUrl(self):
        return self.config["identityServerUrl"]

    def _is_on(self, config_name):
        if config_name in self.config:
            return self.config[config_name] == "on"
        return False

    def _domain(self):
        return self.config["user"].split(":")[1]

    def do_config(self, line):
        """ Show the config for this client: "config"
        Edit a key value mapping: "config key value" e.g. "config token 1234"
        Config variables:
            user: The username to auth with.
            token: The access token to auth with.
            url: The url of the server.
            verbose: [on|off] The verbosity of requests/responses.
            complete_usernames: [on|off] Auto complete partial usernames by
            assuming they are on the same homeserver as you.
            E.g. name >> @name:yourhost
            send_delivery_receipts: [on|off] Automatically send receipts to
            messages when performing a 'stream' command.
        Additional key/values can be added and can be substituted into requests
        by using $. E.g. 'config roomid room1' then 'raw get /rooms/$roomid'.
        """
        if len(line) == 0:
            print json.dumps(self.config, indent=4)
            return

        try:
            args = self._parse(line, ["key", "val"], force_keys=True)

            # make sure restricted config values are checked
            config_rules = [  # key, valid_values
                ("verbose", ["on", "off"]),
                ("complete_usernames", ["on", "off"]),
                ("send_delivery_receipts", ["on", "off"])
            ]
            for key, valid_vals in config_rules:
                if key == args["key"] and args["val"] not in valid_vals:
                    print "%s value must be one of %s" % (args["key"],
                                                          valid_vals)
                    return

            # toggle the http client verbosity
            if args["key"] == "verbose":
                self.http_client.verbose = "on" == args["val"]

            # assign the new config
            self.config[args["key"]] = args["val"]
            print json.dumps(self.config, indent=4)

            save_config(self.config)
        except Exception as e:
            print e

    def do_register(self, line):
        """Registers for a new account: "register <userid> <noupdate>"
        <userid> : The desired user ID
        <noupdate> : Do not automatically clobber config values.
        """
        args = self._parse(line, ["userid", "noupdate"])
        path = "/register"

        password = None
        pwd = None
        pwd2 = "_"
        while pwd != pwd2:
            pwd = getpass.getpass("(Optional) Type a password for this user: ")
            if len(pwd) == 0:
                print "Not using a password for this user."
                break
            pwd2 = getpass.getpass("Retype the password: ")
            if pwd != pwd2:
                print "Password mismatch."
            else:
                password = pwd

        body = {}
        if "userid" in args:
            body["user_id"] = args["userid"]
        if password:
            body["password"] = password

        reactor.callFromThread(self._do_register, "POST", path, body,
                               "noupdate" not in args)

    @defer.inlineCallbacks
    def _do_register(self, method, path, data, update_config):
        url = self._url() + path
        json_res = yield self.http_client.do_request(method, url, data=data)
        print json.dumps(json_res, indent=4)
        if update_config and "user_id" in json_res:
            self.config["user"] = json_res["user_id"]
            self.config["token"] = json_res["access_token"]
            save_config(self.config)

    def do_login(self, line):
        """Login as a specific user: "login @bob:localhost"
        You MAY be prompted for a password, or instructed to visit a URL.
        """
        try:
            args = self._parse(line, ["user_id"], force_keys=True)
            can_login = threads.blockingCallFromThread(
                reactor,
                self._check_can_login)
            if can_login:
                p = getpass.getpass("Enter your password: ")
                user = args["user_id"]
                if self._is_on("complete_usernames") and not user.startswith("@"):
                    user = "@" + user + ":" + self._domain()

                reactor.callFromThread(self._do_login, user, p)
                print " got %s " % p
        except Exception as e:
            print e

    @defer.inlineCallbacks
    def _do_login(self, user, password):
        path = "/login"
        data = {
            "user": user,
            "password": password,
            "type": "m.login.password"
        }
        url = self._url() + path
        json_res = yield self.http_client.do_request("POST", url, data=data)
        print json_res

        if "access_token" in json_res:
            self.config["user"] = user
            self.config["token"] = json_res["access_token"]
            save_config(self.config)
            print "Login successful."

    @defer.inlineCallbacks
    def _check_can_login(self):
        path = "/login"
        # ALWAYS check that the home server can handle the login request before
        # submitting!
        url = self._url() + path
        json_res = yield self.http_client.do_request("GET", url)
        print json_res

        if ("type" not in json_res or "m.login.password" != json_res["type"] or
                "stages" in json_res):
            fallback_url = self._url() + "/login/fallback"
            print ("Unable to login via the command line client. Please visit "
                "%s to login." % fallback_url)
            defer.returnValue(False)
        defer.returnValue(True)

    def do_3pidrequest(self, line):
        """Requests the association of a third party identifier
        <medium> The medium of the identifer (currently only 'email')
        <address> The address of the identifer (ie. the email address)
        """
        args = self._parse(line, ['medium', 'address'])

        if not args['medium'] == 'email':
            print "Only email is supported currently"
            return

        postArgs = {'email': args['address'], 'clientSecret': '____'}

        reactor.callFromThread(self._do_3pidrequest, postArgs)

    @defer.inlineCallbacks
    def _do_3pidrequest(self, args):
        url = self._identityServerUrl()+"/matrix/identity/api/v1/validate/email/requestToken"

        json_res = yield self.http_client.do_request("POST", url, data=urllib.urlencode(args), jsonreq=False,
                                                     headers={'Content-Type': ['application/x-www-form-urlencoded']})
        print json_res
        if 'tokenId' in json_res:
            print "Token ID %s sent" % (json_res['tokenId'])

    def do_3pidvalidate(self, line):
        """Validate and associate a third party ID
        <medium> The medium of the identifer (currently only 'email')
        <tokenId> The identifier iof the token given in 3pidrequest
        <token> The token sent to your third party identifier address
        """
        args = self._parse(line, ['medium', 'tokenId', 'token'])

        if not args['medium'] == 'email':
            print "Only email is supported currently"
            return

        postArgs = { 'tokenId' : args['tokenId'], 'token' : args['token'] }
        postArgs['mxId'] = self.config["user"]

        reactor.callFromThread(self._do_3pidvalidate, postArgs)

    @defer.inlineCallbacks
    def _do_3pidvalidate(self, args):
        url = self._identityServerUrl()+"/matrix/identity/api/v1/validate/email/submitToken"

        json_res = yield self.http_client.do_request("POST", url, data=urllib.urlencode(args), jsonreq=False,
                                                     headers={'Content-Type': ['application/x-www-form-urlencoded']})
        print json_res

    def do_join(self, line):
        """Joins a room: "join <roomid>" """
        try:
            args = self._parse(line, ["roomid"], force_keys=True)
            self._do_membership_change(args["roomid"], "join", self._usr())
        except Exception as e:
            print e

    def do_joinalias(self, line):
        try:
            args = self._parse(line, ["roomname"], force_keys=True)
            path = "/join/%s" % urllib.quote(args["roomname"])
            reactor.callFromThread(self._run_and_pprint, "PUT", path, {})
        except Exception as e:
            print e

    def do_topic(self, line):
        """"topic [set|get] <roomid> [<newtopic>]"
        Set the topic for a room: topic set <roomid> <newtopic>
        Get the topic for a room: topic get <roomid>
        """
        try:
            args = self._parse(line, ["action", "roomid", "topic"])
            if "action" not in args or "roomid" not in args:
                print "Must specify set|get and a room ID."
                return
            if args["action"].lower() not in ["set", "get"]:
                print "Must specify set|get, not %s" % args["action"]
                return

            path = "/rooms/%s/topic" % urllib.quote(args["roomid"])

            if args["action"].lower() == "set":
                if "topic" not in args:
                    print "Must specify a new topic."
                    return
                body = {
                    "topic": args["topic"]
                }
                reactor.callFromThread(self._run_and_pprint, "PUT", path, body)
            elif args["action"].lower() == "get":
                reactor.callFromThread(self._run_and_pprint, "GET", path)
        except Exception as e:
            print e

    def do_invite(self, line):
        """Invite a user to a room: "invite <userid> <roomid>" """
        try:
            args = self._parse(line, ["userid", "roomid"], force_keys=True)

            user_id = args["userid"]

            reactor.callFromThread(self._do_invite, args["roomid"], user_id)
        except Exception as e:
            print e

    @defer.inlineCallbacks
    def _do_invite(self, roomid, userstring):
        if (not userstring.startswith('@') and
                    self._is_on("complete_usernames")):
            url = self._identityServerUrl()+"/matrix/identity/api/v1/lookup"

            json_res = yield self.http_client.do_request("GET", url, qparams={'medium':'email','address':userstring})

            mxid = None

            if 'mxid' in json_res and 'signatures' in json_res:
                url = self._identityServerUrl()+"/matrix/identity/api/v1/pubkey/ed25519"

                pubKey = None
                pubKeyObj = yield self.http_client.do_request("GET", url)
                if 'public_key' in pubKeyObj:
                    pubKey = nacl.signing.VerifyKey(pubKeyObj['public_key'], encoder=nacl.encoding.HexEncoder)
                else:
                    print "No public key found in pubkey response!"

                sigValid = False

                if pubKey:
                    for signame in json_res['signatures']:
                        if signame not in TRUSTED_ID_SERVERS:
                            print "Ignoring signature from untrusted server %s" % (signame)
                        else:
                            try:
                                verify_signed_json(json_res, signame, pubKey)
                                sigValid = True
                                print "Mapping %s -> %s correctly signed by %s" % (userstring, json_res['mxid'], signame)
                                break
                            except SignatureVerifyException as e:
                                print "Invalid signature from %s" % (signame)
                                print e

                if sigValid:
                    print "Resolved 3pid %s to %s" % (userstring, json_res['mxid'])
                    mxid = json_res['mxid']
                else:
                    print "Got association for %s but couldn't verify signature" % (userstring)

            if not mxid:
                mxid = "@" + userstring + ":" + self._domain()

            self._do_membership_change(roomid, "invite", mxid)

    def do_leave(self, line):
        """Leaves a room: "leave <roomid>" """
        try:
            args = self._parse(line, ["roomid"], force_keys=True)
            path = ("/rooms/%s/members/%s/state" %
                    (urllib.quote(args["roomid"]), self._usr()))
            reactor.callFromThread(self._run_and_pprint, "DELETE", path)
        except Exception as e:
            print e

    def do_send(self, line):
        """Sends a message. "send <roomid> <body>" """
        args = self._parse(line, ["roomid", "body"])
        msg_id = "m%s" % int(time.time())
        path = "/rooms/%s/messages/%s/%s" % (urllib.quote(args["roomid"]),
                                             self._usr(),
                                             msg_id)
        body_json = {
            "msgtype": "m.text",
            "body": args["body"]
        }
        reactor.callFromThread(self._run_and_pprint, "PUT", path, body_json)

    def do_list(self, line):
        """List data about a room.
        "list members <roomid> [query]" - List all the members in this room.
        "list messages <roomid> [query]" - List all the messages in this room.

        Where [query] will be directly applied as query parameters, allowing
        you to use the pagination API. E.g. the last 3 messages in this room:
        "list messages <roomid> from=END&to=START&limit=3"
        """
        args = self._parse(line, ["type", "roomid", "qp"])
        if not "type" in args or not "roomid" in args:
            print "Must specify type and room ID."
            return
        if args["type"] not in ["members", "messages"]:
            print "Unrecognised type: %s" % args["type"]
            return
        room_id = args["roomid"]
        path = "/rooms/%s/%s/list" % (urllib.quote(room_id), args["type"])

        qp = {"access_token": self._tok()}
        if "qp" in args:
            for key_value_str in args["qp"].split("&"):
                try:
                    key_value = key_value_str.split("=")
                    qp[key_value[0]] = key_value[1]
                except:
                    print "Bad query param: %s" % key_value
                    return

        reactor.callFromThread(self._run_and_pprint, "GET", path,
                               query_params=qp)

    def do_create(self, line):
        """Creates a room.
        "create [public|private] <roomname>" - Create a room <roomname> with the
                                             specified visibility.
        "create <roomname>" - Create a room <roomname> with default visibility.
        "create [public|private]" - Create a room with specified visibility.
        "create" - Create a room with default visibility.
        """
        args = self._parse(line, ["vis", "roomname"])
        # fixup args depending on which were set
        body = {}
        if "vis" in args and args["vis"] in ["public", "private"]:
            body["visibility"] = args["vis"]

        if "roomname" in args:
            room_name = args["roomname"]
            body["room_alias_name"] = room_name
        elif "vis" in args and args["vis"] not in ["public", "private"]:
            room_name = args["vis"]
            body["room_alias_name"] = room_name

        reactor.callFromThread(self._run_and_pprint, "POST", "/rooms", body)

    def do_raw(self, line):
        """Directly send a JSON object: "raw <method> <path> <data> <notoken>"
        <method>: Required. One of "PUT", "GET", "POST", "xPUT", "xGET",
        "xPOST". Methods with 'x' prefixed will not automatically append the
        access token.
        <path>: Required. E.g. "/events"
        <data>: Optional. E.g. "{ "msgtype":"custom.text", "body":"abc123"}"
        """
        args = self._parse(line, ["method", "path", "data"])
        # sanity check
        if "method" not in args or "path" not in args:
            print "Must specify path and method."
            return

        args["method"] = args["method"].upper()
        valid_methods = ["PUT", "GET", "POST", "DELETE",
                         "XPUT", "XGET", "XPOST", "XDELETE"]
        if args["method"] not in valid_methods:
            print "Unsupported method: %s" % args["method"]
            return

        if "data" not in args:
            args["data"] = None
        else:
            try:
                args["data"] = json.loads(args["data"])
            except Exception as e:
                print "Data is not valid JSON. %s" % e
                return

        qp = {"access_token": self._tok()}
        if args["method"].startswith("X"):
            qp = {}  # remove access token
            args["method"] = args["method"][1:]  # snip the X
        else:
            # append any query params the user has set
            try:
                parsed_url = urlparse.urlparse(args["path"])
                qp.update(urlparse.parse_qs(parsed_url.query))
                args["path"] = parsed_url.path
            except:
                pass

        reactor.callFromThread(self._run_and_pprint, args["method"],
                                                     args["path"],
                                                     args["data"],
                                                     query_params=qp)

    def do_stream(self, line):
        """Stream data from the server: "stream <longpoll timeout ms>" """
        args = self._parse(line, ["timeout"])
        timeout = 5000
        if "timeout" in args:
            try:
                timeout = int(args["timeout"])
            except ValueError:
                print "Timeout must be in milliseconds."
                return
        reactor.callFromThread(self._do_event_stream, timeout)

    @defer.inlineCallbacks
    def _do_event_stream(self, timeout):
        res = yield self.http_client.get_json(
                self._url() + "/events",
                {
                    "access_token": self._tok(),
                    "timeout": str(timeout),
                    "from": self.event_stream_token
                })
        print json.dumps(res, indent=4)

        if "chunk" in res:
            for event in res["chunk"]:
                if (event["type"] == "m.room.message" and
                        self._is_on("send_delivery_receipts") and
                        event["user_id"] != self._usr()):  # not sent by us
                    self._send_receipt(event, "d")

        # update the position in the stram
        if "end" in res:
            self.event_stream_token = res["end"]

    def _send_receipt(self, event, feedback_type):
        path = ("/rooms/%s/messages/%s/%s/feedback/%s/%s" %
               (urllib.quote(event["room_id"]), event["user_id"], event["msg_id"],
                self._usr(), feedback_type))
        data = {}
        reactor.callFromThread(self._run_and_pprint, "PUT", path, data=data,
                               alt_text="Sent receipt for %s" % event["msg_id"])

    def _do_membership_change(self, roomid, membership, userid):
        path = "/rooms/%s/members/%s/state" % (urllib.quote(roomid), userid)
        data = {
            "membership": membership
        }
        reactor.callFromThread(self._run_and_pprint, "PUT", path, data=data)

    def do_displayname(self, line):
        """Get or set my displayname: "displayname [new_name]" """
        args = self._parse(line, ["name"])
        path = "/profile/%s/displayname" % (self.config["user"])

        if "name" in args:
            data = {"displayname": args["name"]}
            reactor.callFromThread(self._run_and_pprint, "PUT", path, data=data)
        else:
            reactor.callFromThread(self._run_and_pprint, "GET", path)

    def _do_presence_state(self, state, line):
        args = self._parse(line, ["msgstring"])
        path = "/presence/%s/status" % (self.config["user"])
        data = {"state": state}
        if "msgstring" in args:
            data["status_msg"] = args["msgstring"]

        reactor.callFromThread(self._run_and_pprint, "PUT", path, data=data)

    def do_offline(self, line):
        """Set my presence state to OFFLINE"""
        self._do_presence_state(0, line)

    def do_away(self, line):
        """Set my presence state to AWAY"""
        self._do_presence_state(1, line)

    def do_online(self, line):
        """Set my presence state to ONLINE"""
        self._do_presence_state(2, line)

    def _parse(self, line, keys, force_keys=False):
        """ Parses the given line.

        Args:
            line : The line to parse
            keys : A list of keys to map onto the args
            force_keys : True to enforce that the line has a value for every key
        Returns:
            A dict of key:arg
        """
        line_args = shlex.split(line)
        if force_keys and len(line_args) != len(keys):
            raise IndexError("Must specify all args: %s" % keys)

        # do $ substitutions
        for i, arg in enumerate(line_args):
            for config_key in self.config:
                if ("$" + config_key) in arg:
                    arg = arg.replace("$" + config_key,
                                      self.config[config_key])
            line_args[i] = arg

        return dict(zip(keys, line_args))

    @defer.inlineCallbacks
    def _run_and_pprint(self, method, path, data=None,
                        query_params={"access_token": None}, alt_text=None):
        """ Runs an HTTP request and pretty prints the output.

        Args:
            method: HTTP method
            path: Relative path
            data: Raw JSON data if any
            query_params: dict of query parameters to add to the url
        """
        url = self._url() + path
        if "access_token" in query_params:
            query_params["access_token"] = self._tok()

        json_res = yield self.http_client.do_request(method, url,
                                                    data=data,
                                                    qparams=query_params)
        if alt_text:
            print alt_text
        else:
            print json.dumps(json_res, indent=4)


def save_config(config):
    with open(CONFIG_JSON, 'w') as out:
        json.dump(config, out)


def main(server_url, identity_server_url, username, token, config_path):
    print "Synapse command line client"
    print "==========================="
    print "Server: %s" % server_url
    print "Type 'help' to get started."
    print "Close this console with CTRL+C then CTRL+D."
    if not username or not token:
        print "-  'register <username>' - Register an account"
        print "-  'stream' - Connect to the event stream"
        print "-  'create <roomid>' - Create a room"
        print "-  'send <roomid> <message>' - Send a message"
    http_client = TwistedHttpClient()

    # the command line client
    syn_cmd = SynapseCmd(http_client, server_url, identity_server_url, username, token)

    # load synapse.json config from a previous session
    global CONFIG_JSON
    CONFIG_JSON = config_path  # bit cheeky, but just overwrite the global
    try:
        with open(config_path, 'r') as config:
            syn_cmd.config = json.load(config)
            try:
                http_client.verbose = "on" == syn_cmd.config["verbose"]
            except:
                pass
            print "Loaded config from %s" % config_path
    except:
        pass

    # Twisted-specific: Runs the command processor in Twisted's event loop
    # to maintain a single thread for both commands and event processing.
    # If using another HTTP client, just call syn_cmd.cmdloop()
    reactor.callInThread(syn_cmd.cmdloop)
    reactor.run()


if __name__ == '__main__':
    parser = argparse.ArgumentParser("Starts a synapse client.")
    parser.add_argument(
        "-s", "--server", dest="server", default="http://localhost:8080",
        help="The URL of the home server to talk to.")
    parser.add_argument(
        "-i", "--identity-server", dest="identityserver", default="http://localhost:8090",
        help="The URL of the identity server to talk to.")
    parser.add_argument(
        "-u", "--username", dest="username",
        help="Your username on the server.")
    parser.add_argument(
        "-t", "--token", dest="token",
        help="Your access token.")
    parser.add_argument(
        "-c", "--config", dest="config", default=CONFIG_JSON,
        help="The location of the config.json file to read from.")
    args = parser.parse_args()

    if not args.server:
        print "You must supply a server URL to communicate with."
        parser.print_help()
        sys.exit(1)

    server = args.server
    if not server.startswith("http://"):
        server = "http://" + args.server

    main(server, args.identityserver, args.username, args.token, args.config)