#!/usr/bin/env python3
import json
import re
from datetime import datetime
from datetime import timedelta as td

fieldsFilter = ('id', 'linkedid', 'appdata', 'lastdata')

class CdrChannel:
  def __init__(self, chanData):
    self._str = chanData
    (self.tech,
     self.peer,
     self.context,
     self.id,
     self.leg) = re.match(r'(\w+)/(\w+)(?:@([\w-]+))?-([0-9a-f]{8})(?:;([0-9]+))?', chanData).groups()
  def __repr__(self):
    return self._str

class CdrEvent:
  def __init__(self, eventData):
    eventData = dict(eventData)
    for key, value in eventData.items():
      if ((key not in fieldsFilter) and (value is not None) and (str(value) != '')):
        if key == 'extra':
          setattr(self, key, json.loads(value))
        elif key in ('channame','channel','dstchannel'):
          setattr(self, key, CdrChannel(value))
        else:
          setattr(self, key, value)
  def __getattr__(self, attr):
    return None

class CdrEvents:
  def __init__(self):
    self._events = []
  def add(self, event):
    if isinstance(event, CdrEvent):
      self._events.append(event)
    else:
      self._events.append(CdrEvent(event))
  @property
  def all(self):
    return self._events
  @property
  def first(self):
    return self._events[0] if len(self._events) > 0 else None
  @property
  def second(self):
    return self._events[1] if len(self._events) > 1 else None
  @property
  def last(self):
    return self._events[-1] if len(self._events) > 0 else None
  def filter(self, key, value, func='__eq__'):
    result = CdrEvents()
    for event in self._events:
      if getattr(str(getattr(event, key)), func)(value):
        result.add(event)
    return result
  def has(self, value, key='disposition'):
    for event in self._events:
      if getattr(event, key) == value:
        return True
    return False
  def __len__(self):
    return len(self._events)

class CdrUserEvents(CdrEvents):
  def __init__(self, user):
    self._user = user
    self._events = []
    self.start = 0
    self.end = 0
  def add(self, event):
    if not isinstance(event, CdrEvent):
      event = CdrEvent(event)
    if self._user in (event.src, event.dst, event.cnum):
      if len(self._events) == 0:
        self.start = event.calldate
        self.end = event.calldate + td(seconds=event.duration)
        self._events.append(event)
      else:
        if (event.calldate + td(seconds=event.duration)) > self.end:
          self.end = event.calldate + td(seconds=event.duration)
        if event.calldate < self.start:
          self.start = event.calldate
        lo = 0
        hi = len(self._events)
        while lo < hi:
          mid = (lo+hi)//2
          if event.calldate < self._events[mid].calldate:
            hi = mid
          else:
            lo = mid+1
        self._events.insert(lo, event)
       
  def simple(self):
    res = []
    for event in self._events:
        simple_event = {'start': event.calldate,
            'answered': event.disposition=='ANSWERED',
            'duration': event.duration,
            #'waiting': event.waiting,
            'application': event.lastapp
            'dst': event.dst,
            'uniqueid': self.uniqueid,
            'file': self.recordingfile}
        res.append(simple_event)
    return res

class CelEvents(CdrEvents):
  def has(self, value, key='eventtype'):
    return super().has(value, key)

class CdrCall:
  def __init__(self, event=None):
    self.events = CdrEvents()
    if event is not None:
      self.events.add(event)
      self.linkedid = event['linkedid']
    else:
      self.linkedid = None
  @property
  def start(self):
    return self.events.first.calldate
  @property
  def disposition(self):
    return self.events.first.disposition
  @property
  def file(self):
    return self.events.first.recordingfile
  @property
  def src(self):
    return self.events.first.cnum
  @property
  def direction(self):
    if self.events.first.dcontext == 'from-internal':
      if self.events.first.outbound_cnum is not None:
        return 'outbound'
      else:
        return 'local'
    else:
      return 'inbound'
  @property
  def dst(self):
    # placeholder
    # TODO: determine last dst based on disposition
    if self.direction == 'outbound':
      return self.events.first.dst
    elif self.direction == 'local':
      return self.events.first.dst
    else:
      if self.events.first.dstchannel is not None:
        return self.events.first.dstchannel.peer
      else:
        return self.events.first.dst
  @property
  def did(self):
    if self.direction == 'inbound':
      return self.events.first.did
    else:
      return None
  @property
  def duration(self):
    if not self.isAnswered:
      return 0
    else:
      if len(self.events) > 1:
        return self.events.second.billsec
      else:
        return self.events.first.billsec
  @property
  def waiting(self):
    if not self.isAnswered:
      return self.events.first.duration
    else:
      # TODO: exclude time on ivr
      return self.events.first.duration - self.duration
  @property
  def isAnswered(self):
    return self.disposition == 'ANSWERED';

class CdrUserCall(CdrCall):
  def __init__(self, user, event=None):
    self.user = user
    self.events = CdrUserEvents(user)
    if event is not None:
      self.events.add(event)
      self.linkedid = event['linkedid']
    else:
      self.linkedid = None
  @property
  def file(self):
    return self.events.first.recordingfile
  @property
  def src(self):
    return self.events.first.cnum
  @property
  def direction(self):
    if self.user in (self.events.first.src, self.events.first.cnum):
      return 'outbound'
    else:
      return 'inbound'
  @property
  def dst(self):
    return self.events.first.dst
  @property
  def did(self):
    if self.direction == 'inbound':
      return self.events.first.did
    else:
      return None
  @property
  def duration(self):
    if not self.isAnswered:
      return 0
    else:
     return self.events.first.billsec
  @property
  def waiting(self):
    if not self.isAnswered:
      return self.events.first.duration
    else:
      # TODO: exclude time on ivr
      return self.events.first.duration - self.duration
  @property
  def isAnswered(self):
    return self.disposition == 'ANSWERED';
  @property
  def simple(self):
    return {'start': self.start,
            'direction': self.direction,
            'answered': self.isAnswered,
            'duration': self.duration,
            'waiting': self.waiting,
            'src': self.src,
            'dst': self.dst,
            'did': self.did,
            'linkedid': self.linkedid,
            'file': self.file,
            'events': self.events.simple()}

class CelCall:
  def __init__(self, event=None):
    self.events = CelEvents()
    if event is not None:
      self.events.add(event)
      self.linkedid = event['linkedid']
    else:
      self.linkedid = None
  @property
  def start(self):
    return self.events.first.eventtime