import PySimpleGUI as sg
from chatterbot import ChatBot
import chatterbot.utils

'''
Demo_Chatterbot.py
A GUI wrapped arouind the Chatterbot package.
The GUI is used to show progress bars during the training process and 
to collect user input that is sent to the chatbot.  The reply is displayed in the GUI window
'''

# Create the 'Trainer GUI'
# The Trainer GUI consists of a lot of progress bars stacked on top of each other
sg.ChangeLookAndFeel('GreenTan')
MAX_PROG_BARS = 20              # number of training sessions
bars = []
texts = []
training_layout = [[sg.T('TRAINING PROGRESS', size=(20, 1), font=('Helvetica', 17))], ]
for i in range(MAX_PROG_BARS):
    bars.append(sg.ProgressBar(100, size=(30, 4)))
    texts.append(sg.T(' ' * 20, size=(20, 1), justification='right'))
    training_layout += [[texts[i], bars[i]],]       # add a single row

training_form = sg.FlexForm('Training')
training_form.Layout(training_layout)
current_bar = 0

# callback function for training runs
def print_progress_bar(description, iteration_counter, total_items, progress_bar_length=20):
    global current_bar
    global bars
    global texts
    global training_form
    # update the form and the bars
    button, values = training_form.ReadNonBlocking()
    if button is None and values is None:       # if user closed the form on us, exit
        exit(69)
    if bars[current_bar].UpdateBar(iteration_counter, max=total_items) is False:
        exit(69)
    texts[current_bar].Update(description)      # show the training dataset name
    if iteration_counter == total_items:
        current_bar += 1

# redefine the chatbot text based progress bar with a graphical one
chatterbot.utils.print_progress_bar = print_progress_bar

chatbot = ChatBot('Ron Obvious', trainer='chatterbot.trainers.ChatterBotCorpusTrainer')

# Train based on the english corpus
chatbot.train("chatterbot.corpus.english")

################# GUI #################
with sg.FlexForm('Chat Window', auto_size_text=True, default_element_size=(30, 2)) as form:
    layout = [[sg.Output(size=(80, 20))],
              [sg.Multiline(size=(70, 5), enter_submits=True),
               sg.ReadFormButton('SEND', bind_return_key=True), sg.ReadFormButton('EXIT')]]

    form.Layout(layout)
    # ---===--- Loop taking in user input and using it to query HowDoI web oracle --- #
    while True:
        button, (value,) = form.Read()
        if button is not 'SEND':
            break
        string = value.rstrip()
        print('     '+string)
        # send the user input to chatbot to get a response
        response = chatbot.get_response(value.rstrip())
        print(response)