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#!/usr/bin/env python
# vim: set fileencoding=utf-8 :

###############################################################################
#                                                                             #
# Copyright (c) 2016 Idiap Research Institute, http://www.idiap.ch/           #
# Contact: beat.support@idiap.ch                                              #
#                                                                             #
# This file is part of the beat.backend.python module of the BEAT platform.   #
#                                                                             #
# Commercial License Usage                                                    #
# Licensees holding valid commercial BEAT licenses may use this file in       #
# accordance with the terms contained in a written agreement between you      #
# and Idiap. For further information contact tto@idiap.ch                     #
#                                                                             #
# Alternatively, this file may be used under the terms of the GNU Affero      #
# Public License version 3 as published by the Free Software and appearing    #
# in the file LICENSE.AGPL included in the packaging of this file.            #
# The BEAT platform is distributed in the hope that it will be useful, but    #
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY  #
# or FITNESS FOR A PARTICULAR PURPOSE.                                        #
#                                                                             #
# You should have received a copy of the GNU Affero Public License along      #
# with the BEAT platform. If not, see http://www.gnu.org/licenses/.           #
#                                                                             #
###############################################################################


import time
import logging
logger = logging.getLogger(__name__)

from functools import reduce

import six
import zmq


class Input:
  """Represents the input of a processing block

  A list of those inputs must be provided to the algorithms (see
  :py:class:`beat.backend.python.inputs.InputList`)


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  Parameters:

    name (str): Name of the input

    data_format (str): Data format accepted by the input

    data_source (beat.core.platform.data.DataSource): Source of data to be used
      by the input


  Attributes:

    group (beat.core.inputs.InputGroup): Group containing this input

    name (str): Name of the input (algorithm-specific)

    data (beat.core.baseformat.baseformat): The last block of data received on
      the input

    data_index (int): Index of the last block of data received on the input
      (see the section *Inputs synchronization* of the User's Guide)

    data_index_end (int): End index of the last block of data received on the
      input (see the section *Inputs synchronization* of the User's Guide)

    data_format (str): Data format accepted by the input

    data_source (beat.core.data.DataSource): Source of data used by the output

    nb_data_blocks_read (int): Number of data blocks read so far

  """

  def __init__(self, name, data_format, data_source):

    self.group               = None
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    self.name                = str(name)
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    self.data                = None
    self.data_index          = -1
    self.data_index_end      = -1
    self.data_same_as_previous = False
    self.data_format         = data_format
    self.data_source         = data_source
    self.nb_data_blocks_read = 0


  def isDataUnitDone(self):
    """Indicates if the current data unit will change at the next iteration"""

    return (self.data_index_end == self.group.data_index_end)


  def hasMoreData(self):
    """Indicates if there is more data to process on the input"""

    return self.data_source.hasMoreData()


  def next(self):
    """Retrieves the next block of data"""

    (self.data, self.data_index, self.data_index_end) = self.data_source.next()
    self.data_same_as_previous = False
    self.nb_data_blocks_read += 1


#----------------------------------------------------------


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class RemoteException(Exception):

    def __init__(self, kind, message):
        super(RemoteException, self).__init__()

        if kind == 'sys':
            self.system_error = message
            self.user_error = ''
        else:
            self.system_error = ''
            self.user_error = message


#----------------------------------------------------------


def process_error(socket):
    kind = socket.recv()
    message = socket.recv()
    raise RemoteException(kind, message)


#----------------------------------------------------------


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class RemoteInput:
  """Allows to access the input of a processing block, via a socket.

  The other end of the socket must be managed by a message handler (see
  :py:class:`beat.backend.python.message_handler.MessageHandler`)

  A list of those inputs must be provided to the algorithms (see
  :py:class:`beat.backend.python.inputs.InputList`)


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  Parameters:

    name (str): Name of the input

    data_format (object): An object with the preloaded data format for this
      input (see :py:class:`beat.backend.python.dataformat.DataFormat`).

    socket (object): A 0MQ socket for writing the data to the server process


  Attributes:

    group (beat.backend.python.inputs.InputGroup): Group containing this input

    data (beat.core.baseformat.baseformat): The last block of data received on
      the input

  """

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  def __init__(self, name, data_format, socket, unpack=True):
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    self.name = str(name)
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    self.data_format = data_format
    self.socket = socket
    self.data = None
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    self.data_index = -1
    self.data_index_end = -1
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    self.group = None
    self.comm_time = 0. #total time spent on communication
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    self.nb_data_blocks_read = 0
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    self._unpack = unpack
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  def isDataUnitDone(self):
    """Indicates if the current data unit will change at the next iteration"""

    logger.debug('send: (idd) is-dataunit-done %s', self.name)
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    _start = time.time()
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    self.socket.send('idd', zmq.SNDMORE)
    self.socket.send(self.group.channel, zmq.SNDMORE)
    self.socket.send(self.name)
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    answer = self.socket.recv()
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    self.comm_time += time.time() - _start
    logger.debug('recv: %s', answer)
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    return answer == 'tru'


  def hasMoreData(self):
    """Indicates if there is more data to process on the input"""

    logger.debug('send: (hmd) has-more-data %s %s', self.group.channel, self.name)
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    _start = time.time()
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    self.socket.send('hmd', zmq.SNDMORE)
    self.socket.send(self.group.channel, zmq.SNDMORE)
    self.socket.send(self.name)
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    answer = self.socket.recv()
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    self.comm_time += time.time() - _start
    logger.debug('recv: %s', answer)
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    if answer == 'err':
        process_error(self.socket)

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    return answer == 'tru'


  def next(self):
    """Retrieves the next block of data"""

    logger.debug('send: (nxt) next %s %s', self.group.channel, self.name)
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    _start = time.time()
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    self.socket.send('nxt', zmq.SNDMORE)
    self.socket.send(self.group.channel, zmq.SNDMORE)
    self.socket.send(self.name)
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    answer = self.socket.recv()

    if answer == 'err':
        self.comm_time += time.time() - _start
        process_error(self.socket)

    self.data_index = int(answer)
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    self.data_index_end = int(self.socket.recv())
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    self.unpack(self.socket.recv())
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    self.comm_time += time.time() - _start
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    self.nb_data_blocks_read += 1
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  def unpack(self, packed):
    """Receives data through socket"""

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    logger.debug('recv: <bin> (size=%d), indexes=(%d, %d)', len(packed),
                 self.data_index, self.data_index_end)
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    if self.unpack:
      self.data = self.data_format.type()
      self.data.unpack(packed)
    else:
      self.data = packed
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#----------------------------------------------------------


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class InputGroup:
  """Represents a group of inputs synchronized together

  The inputs can be either "local" ones (reading data from the cache) or
  "remote" ones (using a socket to communicate with a database view output
  located inside a docker container).
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  The other end of the socket must be managed by a message handler (see
  :py:class:`beat.backend.python.message_handler.MessageHandler`)
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  A group implementing this interface is provided to the algorithms (see
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  :py:class:`beat.backend.python.inputs.InputList`).
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  See :py:class:`beat.core.inputs.Input`

  Example:

    .. code-block:: python

       inputs = InputList()

       print inputs['labels'].data_format

       for index in range(0, len(inputs)):
           print inputs[index].data_format

       for input in inputs:
           print input.data_format

       for input in inputs[0:2]:
           print input.data_format


  Parameters:

    channel (str): Name of the data channel of the group

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    synchronization_listener (beat.core.outputs.SynchronizationListener):
      Synchronization listener to use

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    restricted_access (bool): Indicates if the algorithm can freely use the
      inputs

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  Attributes:

    data_index (int): Index of the last block of data received on the inputs
      (see the section *Inputs synchronization* of the User's Guide)

    data_index_end (int): End index of the last block of data received on the
      inputs (see the section *Inputs synchronization* of the User's Guide)

    channel (str): Name of the data channel of the group

    synchronization_listener (beat.core.outputs.SynchronizationListener):
      Synchronization listener used
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  """

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  def __init__(self, channel, synchronization_listener=None,
          restricted_access=True):
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    self._inputs                  = []
    self.data_index               = -1
    self.data_index_end           = -1
    self.channel                  = str(channel)
    self.synchronization_listener = synchronization_listener
    self.restricted_access        = restricted_access
    self.socket                   = None
    self.comm_time                = 0.
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  def __getitem__(self, index):

    if isinstance(index, six.string_types):
      try:
        return [x for x in self._inputs if x.name == index][0]
      except:
        pass
    elif isinstance(index, int):
      if index < len(self._inputs):
        return self._inputs[index]
    return None


  def __iter__(self):
    for k in self._inputs: yield k


  def __len__(self):
    return len(self._inputs)


  def add(self, input):
    """Add an input to the group

    Parameters:

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      input (beat.backend.python.inputs.Input or beat.backend.python.inputs.RemoteInput):
              The input to add
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    """
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    if isinstance(input, RemoteInput) and (self.socket is None):
      self.socket = input.socket

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    input.group = self
    self._inputs.append(input)


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  def localInputs(self):
    for k in [ x for x in self._inputs if isinstance(x, Input) ]: yield k


  def remoteInputs(self):
    for k in [ x for x in self._inputs if isinstance(x, RemoteInput) ]: yield k


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  def hasMoreData(self):
    """Indicates if there is more data to process in the group"""

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    # First process the local inputs
    res = bool([x for x in self.localInputs() if x.hasMoreData()])
    if res:
      return True

    # Next process the remote inputs
    if self.socket is None:
      return False

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    logger.debug('send: (hmd) has-more-data %s', self.channel)
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    _start = time.time()
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    self.socket.send('hmd', zmq.SNDMORE)
    self.socket.send(self.channel)
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    answer = self.socket.recv()
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    self.comm_time += time.time() - _start
    logger.debug('recv: %s', answer)
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    if answer == 'err':
        process_error(self.socket)

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    return answer == 'tru'


  def next(self):
    """Retrieve the next block of data on all the inputs"""

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    # Only for groups not managed by the platform
    if self.restricted_access:
      raise RuntimeError('Not authorized')
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    # Only retrieve new data on the inputs where the current data expire first
    lower_end_index = reduce(lambda x, y: min(x, y.data_index_end),
            self._inputs[1:], self._inputs[0].data_index_end)
    inputs_to_update = [x for x in self._inputs \
            if x.data_index_end == lower_end_index]
    inputs_up_to_date = [x for x in self._inputs if x not in inputs_to_update]
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    for input in [ x for x in inputs_to_update if isinstance(x, Input) ]:
      input.next()
      input.data_same_as_previous = False

    remote_inputs_to_update = list([ x for x in inputs_to_update if isinstance(x, RemoteInput) ])
    if len(remote_inputs_to_update) > 0:
      logger.debug('send: (nxt) next %s', self.channel)
      self.socket.send('nxt', zmq.SNDMORE)
      self.socket.send(self.channel)

      # read all incomming data
      _start = time.time()
      more = True
      parts = []
      while more:
        parts.append(self.socket.recv())
        if parts[-1] == 'err':
          self.comm_time += time.time() - _start
          process_error(self.socket)

        more = self.socket.getsockopt(zmq.RCVMORE)

      n = int(parts.pop(0))
      logger.debug('recv: %d (inputs)', n)
      for k in range(n):
        name = parts.pop(0)
        logger.debug('recv: %s (data follows)', name)
        inpt = self[name]
        if inpt is None:
          raise RuntimeError("Could not find input `%s' at input group for " \
              "channel `%s' while performing `next' operation on this group " \
              "(current reading position is %d/%d)" % \
              (name, self.channel, k, n))
        inpt.data_index = int(parts.pop(0))
        inpt.data_index_end = int(parts.pop(0))
        inpt.unpack(parts.pop(0))
        inpt.nb_data_blocks_read += 1
      self.comm_time += time.time() - _start

    for input in inputs_up_to_date:
      input.data_same_as_previous = True

    # Compute the group's start and end indices
    self.data_index = reduce(lambda x, y: max(x, y.data_index),
            self._inputs[1:], self._inputs[0].data_index)
    self.data_index_end = reduce(lambda x, y: min(x, y.data_index_end),
            self._inputs[1:], self._inputs[0].data_index_end)

    # Inform the synchronisation listener
    if self.synchronization_listener is not None:
      self.synchronization_listener.onIntervalChanged(self.data_index,
              self.data_index_end)
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#----------------------------------------------------------


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class InputList:
  """Represents the list of inputs of a processing block

  Inputs are organized by groups. The inputs inside a group are all
  synchronized together (see the section *Inputs synchronization* of the User's
  Guide).

  A list implementing this interface is provided to the algorithms

  One group of inputs is always considered as the **main** one, and is used to
  drive the algorithm. The usage of the other groups is left to the algorithm.

  See :py:class:`beat.core.inputs.Input`
  See :py:class:`beat.core.inputs.InputGroup`


  Example:

    .. code-block:: python

       inputs = InputList()
       ...

       # Retrieve an input by name
       input = inputs['labels']

       # Retrieve an input by index
       for index in range(0, len(inputs)):
           input = inputs[index]

       # Iteration over all inputs
       for input in inputs:
           ...

       # Iteration over some inputs
       for input in inputs[0:2]:
           ...

       # Retrieve the group an input belongs to, by input name
       group = inputs.groupOf('label')

       # Retrieve the group an input belongs to
       input = inputs['labels']
       group = input.group


  Attributes:

    group (beat.core.inputs.InputGroup): Main group (for data-driven
      algorithms)

  """

  def __init__(self):
    self._groups = []
    self.main_group = None


  def add(self, group):
    """Add a group to the list

    :param beat.core.platform.inputs.InputGroup group: The group to add
    """
    if group.restricted_access and (self.main_group is None):
      self.main_group = group

    self._groups.append(group)

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  def __getitem__(self, index):
    if isinstance(index, six.string_types):
      try:
        return [k for k in map(lambda x: x[index], self._groups) \
                if k is not None][0]
      except:
        pass

    elif isinstance(index, int):
      for group in self._groups:
        if index < len(group): return group[index]
        index -= len(group)

    return None

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  def __iter__(self):
    for i in range(len(self)): yield self[i]

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  def __len__(self):
    return reduce(lambda x, y: x + len(y), self._groups, 0)

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  def nbGroups(self):
    return len(self._groups)

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  def groupOf(self, input_name):
    try:
      return [k for k in self._groups if k[input_name] is not None][0]
    except:
      return None

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  def hasMoreData(self):
    """Indicates if there is more data to process in any group"""
    return bool([x for x in self._groups if x.hasMoreData()])


  def group(self, name):
    try:
      return [x for x in self._groups if x.channel == name][0]
    except:
      return None