#!/bin/env python3
#

import re
import sys
import threading
from time import sleep
from os.path import basename
from datetime import datetime
from argparse import ArgumentParser
from http.server import BaseHTTPRequestHandler, HTTPServer
from urllib.parse import urlparse

try:
    from sh import tail

except ImportError as e:
    print('[Error] Please install sh via pip! {}'.format(e))
    sys.exit(1)


# active room dictionary
roomList = {}

# @see https://regex101.com/r/R1B1OL/1
regex = r"(Jicofo)\s(\d+-\d+-\d+)\s(\d+\:\d+\:\d+\.\d+)\s(\w+):\s\[(\d+)\]\s(.*)\(\)\s(.*)"
prog = re.compile(regex)

##
# new jitsi room
room_regex = r"(^Joining\sthe\sroom):(.*)"
room = re.compile(room_regex)

# disposed room
disposed_regex = r"^Disposed\sconference\sfor\sroom\:\s(.*)@(.*)\sconference\scount:\s(\d+)"
disposed = re.compile(disposed_regex)

##
# get the room owner
owner_regex = r"Granted\sowner\sto\s([a-z0-9-]+)\@(.*)\/(.*)"
owner = re.compile(owner_regex)

# get member for room
member_regex = r"^Member\s(.*)@(.*)\/(.*)\sjoined."
member = re.compile(member_regex)


class MeetingRoom():
    """
    represent a Jitsi Meetingroom
    jid:    eg room@conference.meet.leinelab.org
    ctime:  eg 2020-06-01 12:32:02 ..
    """

    members = []

    def __init__(self, jid, ctime):
        self.jid = jid
        self.ctime = ctime

    def setOwner(self, name):
        self.owner = name

    def getOwner(self):
        if hasattr(self, 'owner'):
            return self.owner
        else:
            return None

    def addMember(self, name):
        self.members.append(name)

    def getMembers(self):
        return self.members

    def __str__(self):
        return '{}: {}'.format(self.jid, self.owner)


class logThread(threading.Thread):
    def __init__(self, threadID, name, filename):
        threading.Thread.__init__(self)
        self.threadID = threadID
        self.name = name
        self.filename = filename

    def run(self):
        while True:
            getLogMsg(self.filename)
            sleep(5)


class MyServer(BaseHTTPRequestHandler):
    def do_GET(self):
        if basename(self.path) in roomList:
            self.send_response(200)
            self.send_header("Content-type", "text/plain")
            self.end_headers()
            response_string = bytes(basename(self.path)
                                    + '|'
                                    + str(roomList[basename(self.path)].ctime)
                                    + '|'
                                    + str(len(roomList[basename(self.path)].members))
                                    + '|', "utf-8")
            self.wfile.write(response_string)
        else:
            self.send_response(404)
            self.send_header("Content-type", "text/plain")
            self.end_headers()



def getRoomName(jid):
    return jid.split("@")[0].strip()


def mkDatetime(str_date, str_time):
    return datetime.fromisoformat('{} {}'.format(str_date, str_time))


def process_line(line):
    """
    process a logfile line, using global object and vars
    globals: prog, disposed, owner, member, roomList
    line: string
    """
    erg = prog.match(line)
    if erg:
        # detect room creation
        new_room = room.match(erg.group(7))
        if new_room:
            room_name = getRoomName(new_room.group(2))
            room_date = mkDatetime(erg.group(2), erg.group(3))
            print('{} {}'.format(room_date, room_name))
            currentRoom = MeetingRoom(room_name, room_date)
            if room_name in roomList:
                # delete old room and recreate it
                del roomList[room_name]
                roomList[room_name] = currentRoom
            else:
                roomList[room_name] = currentRoom

        disposed_room = disposed.match(erg.group(7))
        if disposed_room:
            room_name = disposed_room.group(1)
            print('-> room disposed: {}'.format(room_name))
            if room_name in roomList:
                del roomList[room_name]
   
        owner_match = owner.match(erg.group(7))
        if owner_match:
            room_name = owner_match.group(1).strip()
            room_owner = owner_match.group(3).strip()
            # print('{}: {}'.format(room_name, room_owner))
            if room_name in roomList:
                roomList[room_name].setOwner(room_owner)

        member_match = member.match(erg.group(7))
        if member_match:
            room_name = member_match.group(1).strip()
            room_member = member_match.group(3).strip()
            print('--> {}: {}'.format(room_name, room_member))
            if room_name in roomList:
                roomList[room_name].addMember(room_member)


def getLogMsg(logfile):
    """
    get log messages and commit it to process_line
    used pytail module
    """
    # for line in Pygtail(logfile, full_lines=True):
    #     process_line(line)

    for line in tail("-f", logfile, _iter=True):
        process_line(line)


if __name__ == '__main__':
    # start cmdline processing
    parser = ArgumentParser(description='Jitsi Meet Conference Stats')
    parser.add_argument('--log', '-l',
                        help='full path to jicofo logfile eg.' +
                        ' /var/log/jitsi/jicofo.log')
    parser.add_argument('--verbose', '-v',
                        help='be verbose eg. for debugging',
                        action='store_true')
    parser.add_argument('--logwatch', '-w',
                        help='run as logwatch module, ' +
                        ' dont start the webserver and only run once')

    args = parser.parse_args()

    if args.log:
        try:
            loggerThread = logThread(1, "Thread-Logger", args.log)
            loggerThread.start()
        except:
            print('Error: unable to start threads')

        hostName = 'localhost'
        serverPort = 9999
        webServer = HTTPServer((hostName, serverPort), MyServer)

        try:
            print("Server started http://%s:%s" % (hostName, serverPort))
            webServer.serve_forever()
        except:
            pass