# encoding: UTF-8
# Copyright 2017 Google.com
#
# 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.

import tensorflow as tf
import numpy as np
import my_txtutils

# these must match what was saved !
ALPHASIZE = my_txtutils.ALPHASIZE
NLAYERS = 3
INTERNALSIZE = 512

# Data files can be downloaded from the following locations:
#    - Fully trained on Shakespeare or Tensorflow Python source:
#      https://drive.google.com/file/d/0B5njS_LX6IsDc2lWTmtyanRpOHc/view?usp=sharing
#    - Partially trained, to see how they make progress in training:
#      https://drive.google.com/file/d/0B5njS_LX6IsDUlFsMkdhclNSazA/view?usp=sharing

shakespeareC0 = "checkpoints/rnn_train_1495455686-0"      # random
shakespeareC1 = "checkpoints/rnn_train_1495455686-150000"  # lower case gibberish
shakespeareC2 = "checkpoints/rnn_train_1495455686-300000"  # words, paragraphs
shakespeareC3 = "checkpoints/rnn_train_1495455686-450000"  # structure of a play, unintelligible words
shakespeareC4 = "checkpoints/rnn_train_1495447371-15000000"  # better structure of a play, character names (not very good), 4-letter words in correct English
shakespeareC5 = "checkpoints/rnn_train_1495447371-45000000"  # good names, even when invented (ex: SIR NATHANIS LORD OF SYRACUSE), correct 6-8 letter words
shakespeareB10 = "checkpoints/rnn_train_1495440473-102000000" # ACT V SCENE IV, [Re-enter KING JOHN with MARDIAN], DON ADRIANO DRAGHAMONE <- invented!
# most scene directions correct: [Enter FERDINAND] [Dies] [Exit ROSALIND] [To COMINIUS with me] [Enter PRINCE HENRY, and Attendants], correct English.

pythonA0 = "checkpoints/rnn_train_1495458538-300000"  # gibberish
pythonA1 = "checkpoints/rnn_train_1495458538-1200000"  # some function calls with parameters and ()
pythonA2 = "checkpoints/rnn_train_1495458538-10200000"  # starts looking Tensorflow Python, nested () and [] not perfect yet
pythonB10 = "checkpoints/rnn_train_1495458538-201600000"  # can even recite the Apache license

# use topn=10 for all but the last one which works with topn=2 for Shakespeare and topn=3 for Python
author = shakespeareB10

ncnt = 0
with tf.Session() as sess:
    new_saver = tf.train.import_meta_graph('checkpoints/rnn_train_1495455686-0.meta')
    new_saver.restore(sess, author)
    x = my_txtutils.convert_from_alphabet(ord("L"))
    x = np.array([[x]])  # shape [BATCHSIZE, SEQLEN] with BATCHSIZE=1 and SEQLEN=1

    # initial values
    y = x
    h = np.zeros([1, INTERNALSIZE * NLAYERS], dtype=np.float32)  # [ BATCHSIZE, INTERNALSIZE * NLAYERS]
    file = open("generated_output.txt", "w")
    file.write("Hi there, this a generated output poem from the shakespeare machine. have fun! \n\n")
    for i in range(10000):
        yo, h = sess.run(['Yo:0', 'H:0'], feed_dict={'X:0': y, 'pkeep:0': 1., 'Hin:0': h, 'batchsize:0': 1})

        # If sampling is be done from the topn most likely characters, the generated text
        # is more credible and more "english". If topn is not set, it defaults to the full
        # distribution (ALPHASIZE)

        # Recommended: topn = 10 for intermediate checkpoints, topn=2 or 3 for fully trained checkpoints

        c = my_txtutils.sample_from_probabilities(yo, topn=2)
        y = np.array([[c]])  # shape [BATCHSIZE, SEQLEN] with BATCHSIZE=1 and SEQLEN=1
        c = chr(my_txtutils.convert_to_alphabet(c))
        print(c, end="")
        file.write(c)

        if c == '\n':
            ncnt = 0
        else:
            ncnt += 1
        if ncnt == 100:
            print("")
            file.write("")
            ncnt = 0
    file.close()


#        Example output:
#
#
# ACT I
#
#
#
# SCENE III	An ante-chamber. The COUNT's palace.
#
#
# [Enter CLEOMENES, with the Lord SAY]
#
# Chamberlain	Let me see your worshing in my hands.
#
# LUCETTA	I am a sign of me, and sorrow sounds it.
#
# [Enter CAPULET and LADY MACBETH]
#
# What manner of mine is mad, and soon arise?
#
# JULIA	What shall by these things were a secret fool,
# That still shall see me with the best and force?
#
# Second Watchman	Ay, but we see them not at home: the strong and fair of thee,
# The seasons are as safe as the time will be a soul,
# That works out of this fearful sore of feather
# To tell her with a storm of something storms
# That have some men of man is now the subject.
# What says the story, well say we have said to thee,
# That shall she not, though that the way of hearts,
# We have seen his service that we may be sad.
#
# [Retains his house]
# ADRIANA	What says my lord the Duke of Burgons of Tyre?
#
# DOMITIUS ENOBARBUS	But, sir, you shall have such a sweet air from the state,
# There is not so much as you see the store,
# As if the base should be so foul as you.
#
# DOMITIUS ENOY	If I do now, if you were not to seek to say,
# That you may be a soldier's father for the field.
#
# [Exit]