#!/usr/bin/env python

from __future__ import absolute_import, division, print_function

import dbus
import re
import sys
import time
try:
    from urllib.parse import unquote_plus
except ImportError:
    from urllib import unquote_plus


bus = dbus.SessionBus()
obj = None
try:
    obj = bus.get_object("im.pidgin.purple.PurpleService",
                         "/im/pidgin/purple/PurpleObject")
except dbus.DBusException as e:
    if e._dbus_error_name == "org.freedesktop.DBus.Error.ServiceUnknown":
        print("Error: no libpurple-powered client is running. "
              "Try starting Pidgin or Finch.")
        sys.exit(1)
purple = dbus.Interface(obj, "im.pidgin.purple.PurpleInterface")


class CheckedObject(object):
    def __init__(self, obj):
        self.obj = obj

    def __getattr__(self, attr):
        return CheckedAttribute(self, attr)


class CheckedAttribute(object):
    def __init__(self, cobj, attr):
        self.cobj = cobj
        self.attr = attr

    def __call__(self, *args):
        # Redirect stderr to suppress the printing of an " Introspect error"
        # message if nothing is listening on the bus.  We print a friendly
        # error message ourselves.
        real_stderr = sys.stderr
        sys.stderr = None
        result = self.cobj.obj.__getattr__(self.attr)(*args)
        sys.stderr = real_stderr

# This can be useful for debugging.
#        if result == 0:
#            print("Error:", self.attr, str(args), "returned", str(result))

        return result


cpurple = CheckedObject(purple)


def extendlist(list, length, fill):
    if len(list) < length:
        return list + [fill] * (length - len(list))
    else:
        return list


def convert(value):
    try:
        return int(value)
    except:
        return value


def account_not_found():
    print("No matching account found.")
    sys.exit(1)


def bring_account_online(account):
    if not cpurple.PurpleAccountIsConnected(account):
        # The last argument is meant to be a GList * but the D-Bus binding
        # generator thing just wants a UInt32, which is pretty failing.
        # Happily, passing a 0 to mean an empty list turns out to work anyway.
        purple.PurpleAccountSetStatusList(account, "online", 1, 0)
        purple.PurpleAccountConnect(account)


def findaccount(protocolname, accountname="", matcher=None):
    if matcher:
        for account in cpurple.PurpleAccountsGetAll():
            if protocolname != cpurple.PurpleAccountGetProtocolId(account):
                continue
            if (accountname != "" and
                    accountname != cpurple.PurpleAccountGetUsername(account)):
                continue
            if matcher(account):
                bring_account_online(account)
                return account
        account_not_found()

    # prefer connected accounts
    account = cpurple.PurpleAccountsFindConnected(accountname, protocolname)
    if account != 0:
        return account

    # try to get any account and connect it
    account = cpurple.PurpleAccountsFindAny(accountname, protocolname)
    if account == 0:
        account_not_found()

    bring_account_online(account)
    return account


def goim(account, screenname, message=None):
    # XXX: 1 == PURPLE_CONV_TYPE_IM
    conversation = cpurple.PurpleConversationNew(1, account, screenname)
    if message:
        purple.PurpleConvSendConfirm(conversation, message)


def gochat(account, params, message=None):
    connection = cpurple.PurpleAccountGetConnection(account)
    purple.PurpleServJoinChat(connection, params)

    if message is not None:
        for i in range(20):
            # XXX: 2 == PURPLE_CONV_TYPE_CHAT
            conversation = purple.PurpleFindConversationWithAccount(
                2,
                params.get("channel", params.get("room")),
                account)
            if conversation:
                purple.PurpleConvSendConfirm(conversation, message)
                break
            else:
                time.sleep(0.5)


def addbuddy(account, screenname, group="", alias=""):
    cpurple.PurpleBlistRequestAddBuddy(account, screenname, group, alias)


def aim(uri):
    protocol = "prpl-aim"
    match = re.match(r"^aim:([^?]*)(\?(.*))", uri)
    if not match:
        print("Invalid aim URI: %s" % (uri, ))
        return

    command = unquote_plus(match.group(1))
    paramstring = match.group(3)
    params = {}
    if paramstring:
        for param in paramstring.split("&"):
            key, value = extendlist(param.split("=", 1), 2, "")
            params[key] = unquote_plus(value)
    accountname = params.get("account", "")
    screenname = params.get("screenname", "")

    account = findaccount(protocol, accountname)

    if command.lower() == "goim":
        goim(account, screenname, params.get("message"))
    elif command.lower() == "gochat":
        gochat(account, params)
    elif command.lower() == "addbuddy":
        addbuddy(account, screenname, params.get("group", ""))


def gg(uri):
    protocol = "prpl-gg"
    match = re.match(r"^gg:(.*)", uri)
    if not match:
        print("Invalid gg URI: %s" % (uri, ))
        return

    screenname = unquote_plus(match.group(1))
    account = findaccount(protocol)
    goim(account, screenname)


def icq(uri):
    protocol = "prpl-icq"
    match = re.match(r"^icq:([^?]*)(\?(.*))", uri)
    if not match:
        print("Invalid icq URI: %s" % (uri, ))
        return

    command = unquote_plus(match.group(1))
    paramstring = match.group(3)
    params = {}
    if paramstring:
        for param in paramstring.split("&"):
            key, value = extendlist(param.split("=", 1), 2, "")
            params[key] = unquote_plus(value)
    accountname = params.get("account", "")
    screenname = params.get("screenname", "")

    account = findaccount(protocol, accountname)

    if command.lower() == "goim":
        goim(account, screenname, params.get("message"))
    elif command.lower() == "gochat":
        gochat(account, params)
    elif command.lower() == "addbuddy":
        addbuddy(account, screenname, params.get("group", ""))


def irc(uri):
    protocol = "prpl-irc"
    match = re.match(r"^irc:(//([^/]*))?/?([^?]*)(\?(.*))?", uri)
    if not match:
        print("Invalid irc URI: %s" % (uri, ))
        return

    server = unquote_plus(match.group(2) or "")
    target = match.group(3) or ""
    query = match.group(5) or ""

    modifiers = {}
    if target:
        for modifier in target.split(",")[1:]:
            modifiers[modifier] = True

    paramstring = match.group(5)
    params = {}
    if paramstring:
        for param in paramstring.split("&"):
            key, value = extendlist(param.split("=", 1), 2, "")
            params[key] = unquote_plus(value)

    def correct_server(account):
        username = cpurple.PurpleAccountGetUsername(account)
        return (server == "" or
                "@" in username and server == username.split("@")[1])

    account = findaccount(protocol, matcher=correct_server)

    if target != "":
        if "isnick" in modifiers:
            goim(account, unquote_plus(target.split(",")[0]),
                 params.get("msg"))
        else:
            channel = unquote_plus(target.split(",")[0])
            if channel[0] != "#":
                channel = "#" + channel
            gochat(account,
                   {"server": server,
                    "channel": channel,
                    "password": params.get("key", "")},
                   params.get("msg"))


def sip(uri):
    protocol = "prpl-simple"
    match = re.match(r"^sip:(.*)", uri)
    if not match:
        print("Invalid sip URI: %s" % (uri, ))
        return

    screenname = unquote_plus(match.group(1))
    account = findaccount(protocol)
    goim(account, screenname)


def xmpp(uri):
    protocol = "prpl-jabber"
    match = re.match(
        r"^xmpp:(//([^/?#]*)/?)?([^?#]*)(\?([^;#]*)(;([^#]*))?)?(#(.*))?",
        uri)
    if not match:
        print("Invalid xmpp URI: %s" % (uri, ))
        return

    tmp = match.group(2)
    if tmp:
        accountname = unquote_plus(tmp)
    else:
        accountname = ""

    screenname = unquote_plus(match.group(3))

    tmp = match.group(5)
    if tmp:
        command = unquote_plus(tmp)
    else:
        command = ""

    paramstring = match.group(7)
    params = {}
    if paramstring:
        for param in paramstring.split(";"):
            key, value = extendlist(param.split("=", 1), 2, "")
            params[key] = unquote_plus(value)

    account = findaccount(protocol, accountname)

    if command.lower() == "message":
        goim(account, screenname, params.get("body"))
    elif command.lower() == "join":
        room, server = screenname.split("@")
        gochat(account, {"room": room, "server": server})
    elif command.lower() == "roster":
        addbuddy(account, screenname, params.get("group", ""),
                 params.get("name", ""))
    else:
        goim(account, screenname)


def gtalk(uri):
    protocol = "prpl-jabber"
    match = re.match(r"^gtalk:([^?]*)(\?(.*))", uri)
    if not match:
        print("Invalid gtalk URI: %s" % (uri, ))
        return

    command = unquote_plus(match.group(1))
    paramstring = match.group(3)
    params = {}
    if paramstring:
        for param in paramstring.split("&"):
            key, value = extendlist(param.split("=", 1), 2, "")
            params[key] = unquote_plus(value)
    accountname = params.get("from_jid", "")
    jid = params.get("jid", "")

    account = findaccount(protocol, accountname)

    if command.lower() == "chat":
        goim(account, jid)
    elif command.lower() == "call":
        # XXX V&V prompt to establish call
        goim(account, jid)


def main(argv=sys.argv):
    if len(argv) != 2 or argv[1] == "--help" or argv[1] == "-h":
        print("Usage: %s URI" % (argv[0], ))
        print("Example: %s \"xmpp:romeo@montague.net?message\"" % (argv[0], ))

        if len(argv) != 2:
            sys.exit(1)
        else:
            return 0

    uri = argv[1]
    type = uri.split(":")[0]

    try:
        if type == "aim":
            aim(uri)
        elif type == "gg":
            gg(uri)
        elif type == "icq":
            icq(uri)
        elif type == "irc":
            irc(uri)
        elif type == "sip":
            sip(uri)
        elif type == "xmpp":
            xmpp(uri)
        elif type == "gtalk":
            gtalk(uri)
        else:
            print("Unknown protocol: %s" % (type, ))
    except dbus.DBusException as e:
        print("Error: %s" % (str(e), ))
        sys.exit(1)


if __name__ == "__main__":
    main()