import sys
import json
from mycroft.messagebus.client.ws import WebsocketClient
from mycroft.messagebus.message import Message
from mycroft.configuration import ConfigurationManager
from websocket import create_connection


def main():
    """
        Main function, will run if executed from command line.

        Sends parameters from commandline.

        Param 1:    message string
        Param 2:    data (json string)
    """
    # Parse the command line
    if len(sys.argv) == 2:
        messageToSend = sys.argv[1]
        dataToSend = {}
    elif len(sys.argv) == 3:
        messageToSend = sys.argv[1]
        try:
            dataToSend = json.loads(sys.argv[2])
        except BaseException:
            print("Second argument must be a JSON string")
            print("Ex: python -m mycroft.messagebus.send speak "
                  "'{\"utterance\" : \"hello\"}'")
            exit()
    else:
        print("Command line interface to the mycroft-core messagebus.")
        print("Usage: python -m mycroft.messagebus.send message")
        print("       python -m mycroft.messagebus.send message JSON-string\n")
        print("Examples: python -m mycroft.messagebus.send system.wifi.setup")
        print("Ex: python -m mycroft.messagebus.send speak "
              "'{\"utterance\" : \"hello\"}'")
        exit()

    send(messageToSend, dataToSend)


def send(messageToSend, dataToSend=None):
    """
        Send a single message over the websocket.

        Args:
            messageToSend (str):    Message to send
            dataToSend (dict):      data structure to go along with the
                                    message, defaults to empty dict.
    """
    dataToSend = dataToSend or {}

    # Calculate the standard Mycroft messagebus websocket address
    config = ConfigurationManager.get().get("websocket")
    url = WebsocketClient.build_url(config.get("host"),
                                    config.get("port"),
                                    config.get("route"),
                                    config.get("ssl"))

    # Send the provided message/data
    ws = create_connection(url)
    packet = Message(messageToSend, dataToSend).serialize()
    ws.send(packet)
    ws.close()


if __name__ == '__main__':
    try:
        main()
    except IOError:
        print('Could not connect to websocket, no message sent')
