# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
# Copyright (C) 2017 Intellisist, Inc. (Author: Hainan Xu)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================


"""Utilities for parsing RNNLM text files."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import collections
import os

import tensorflow as tf

def _read_words(filename):
  with tf.gfile.GFile(filename, "r") as f:
    return f.read().decode("utf-8").split()

def _build_vocab(filename):
  words = _read_words(filename)
  word_to_id = dict(list(zip(words, list(range(len(words))))))
  return word_to_id


def _file_to_word_ids(filename, word_to_id):
  data = _read_words(filename)
  return [word_to_id[word] for word in data if word in word_to_id]


def rnnlm_raw_data(data_path, vocab_path):
  """Load RNNLM raw data from data directory "data_path".

  Args:
    data_path: string path to the directory where train/valid files are stored

  Returns:
    tuple (train_data, valid_data, test_data, vocabulary)
    where each of the data objects can be passed to RNNLMIterator.
  """

  train_path = os.path.join(data_path, "train")
  valid_path = os.path.join(data_path, "valid")

  word_to_id = _build_vocab(vocab_path)
  train_data = _file_to_word_ids(train_path, word_to_id)
  valid_data = _file_to_word_ids(valid_path, word_to_id)
  vocabulary = len(word_to_id)
  return train_data, valid_data, vocabulary, word_to_id


def rnnlm_producer(raw_data, batch_size, num_steps, name=None):
  """Iterate on the raw RNNLM data.

  This chunks up raw_data into batches of examples and returns Tensors that
  are drawn from these batches.

  Args:
    raw_data: one of the raw data outputs from rnnlm_raw_data.
    batch_size: int, the batch size.
    num_steps: int, the number of unrolls.
    name: the name of this operation (optional).

  Returns:
    A pair of Tensors, each shaped [batch_size, num_steps]. The second element
    of the tuple is the same data time-shifted to the right by one.

  Raises:
    tf.errors.InvalidArgumentError: if batch_size or num_steps are too high.
  """
  with tf.name_scope(name, "RNNLMProducer", [raw_data, batch_size, num_steps]):
    raw_data = tf.convert_to_tensor(raw_data, name="raw_data", dtype=tf.int32)

    data_len = tf.size(raw_data)
    batch_len = data_len // batch_size
    data = tf.reshape(raw_data[0 : batch_size * batch_len],
                      [batch_size, batch_len])

    epoch_size = (batch_len - 1) // num_steps
    assertion = tf.assert_positive(
        epoch_size,
        message="epoch_size == 0, decrease batch_size or num_steps")
    with tf.control_dependencies([assertion]):
      epoch_size = tf.identity(epoch_size, name="epoch_size")

    i = tf.train.range_input_producer(epoch_size, shuffle=False).dequeue()
    x = tf.strided_slice(data, [0, i * num_steps],
                         [batch_size, (i + 1) * num_steps])
    x.set_shape([batch_size, num_steps])
    y = tf.strided_slice(data, [0, i * num_steps + 1],
                         [batch_size, (i + 1) * num_steps + 1])
    y.set_shape([batch_size, num_steps])
    return x, y