from typing import List
from xml.etree import ElementTree
from datetime import datetime

from langfingaz.util import util


class Meeting(object):
    def __init__(self, xml_meeting: ElementTree.Element):
        self.meetingName: str = xml_meeting.find('meetingName').text
        self.meetingID: str = xml_meeting.find('meetingID').text
        self.internalMeetingID: str = xml_meeting.find('internalMeetingID').text

        self.isRunning: bool = util.asBoolean(xml_meeting.find('running').text)
        self.startTime: int = int(xml_meeting.find('startTime').text)
        self.createTime: int = int(xml_meeting.find('createTime').text)
        if self.isRunning:
            self.endTime = None
        else:
            self.endTime = xml_meeting.find('endTime').text

        # TODO: disable default meeting recordings (!)
        self.isRecording: bool = util.asBoolean(xml_meeting.find('recording').text)
        self.isBreakout: bool = util.asBoolean(xml_meeting.find('isBreakout').text)

        self.participantCount: int = int(xml_meeting.find('participantCount').text)
        self.listenerCount: int = int(xml_meeting.find('listenerCount').text)
        self.voiceParticipantCount: int = int(xml_meeting.find('voiceParticipantCount').text)
        self.videoCount: int = int(xml_meeting.find('videoCount').text)
        self.maxUsers: int = int(xml_meeting.find('maxUsers').text)
        self.moderatorCount: int = int(xml_meeting.find('moderatorCount').text)

        self.attendees: List[Attendee] = [Attendee(xml_attendee) for xml_attendee in
                                          xml_meeting.find('attendees').iter('attendee')]

    def __str__(self):
        return util.asString(self)


class Attendee(object):
    def __init__(self, xml_attendee: ElementTree.Element):
        # self.userID = xml_attendee.find('userID').text
        # self.fullName = xml_attendee.find('fullName').text
        self.role = xml_attendee.find('role').text
        self.isPresenter: bool = util.asBoolean(xml_attendee.find('isPresenter').text)
        self.isListeningOnly: bool = util.asBoolean(xml_attendee.find('isListeningOnly').text)
        self.hasJoinedVoice: bool = util.asBoolean(xml_attendee.find('hasJoinedVoice').text)
        self.hasVideo: bool = util.asBoolean(xml_attendee.find('hasVideo').text)

    def __str__(self):
        return util.asString(self)


class BbbStatus(object):
    """
    Represents the status of one BBB server at one point of time.
    It contains statistics about the running meetings on the server
    and (TODO) it's CPU utilization and network usage.
    """

    pointOfTime: datetime = None

    @staticmethod
    def getKey(bbbStatus):
        """
        Returns the date of this object as key for sorting.
        See also: https://docs.python.org/3.7/howto/sorting.html#key-functions

        :return: Key that can be used for sorting
        """
        return bbbStatus.pointOfTime

    def __init__(self, meetings: List[Meeting], pointOfTime: datetime = None):
        """
        :param meetings: All current meetings
        :param pointOfTime: The date and time at which the information about
          the running meetings has been captured / requested from the BBB instance
        """
        self.meetings = meetings
        self.pointOfTime = pointOfTime

        self.recordingCount = 0
        self.participantCount = 0
        self.listenerCount = 0
        self.voiceParticipantCount = 0
        self.videoCount = 0
        self.moderatorCount = 0

        for meeting in meetings:
            self.participantCount += meeting.participantCount
            self.listenerCount += meeting.listenerCount
            self.voiceParticipantCount += meeting.voiceParticipantCount
            self.videoCount += meeting.videoCount
            self.moderatorCount += meeting.moderatorCount
            if meeting.isRecording:
                self.recordingCount += 1

    def __str__(self):
        return util.asString(self)


def parseMeetingsData(dataStr: str) -> List[Meeting]:
    tree = ElementTree.fromstring(dataStr)
    xml_meetings = tree.find('meetings')

    return [Meeting(xml_meeting) for xml_meeting in xml_meetings.iter('meeting')]