from transformers import RobertaTokenizer, RobertaForMaskedLM, pipeline, GPT2TokenizerFast
import torch
import pronouncing
import wikipedia
import re
import random
import nltk
import syllables
import gradio as gr
nltk.download('cmudict')

frequent_words = set()

def set_seed(seed: int):
    """
    Helper function for reproducible behavior to set the seed in ``random``, ``numpy``, ``torch`` and/or ``tf`` (if
    installed).

    Args:
        seed (:obj:`int`): The seed to set.
    """
    #random.seed(seed)
    #np.random.seed(seed)
    #if is_torch_available():
    torch.manual_seed(seed)
    torch.cuda.manual_seed_all(seed)
        # ^^ safe to call this function even if cuda is not available
    #if is_tf_available():
        #tf.random.set_seed(seed)
        
with open("wordFrequency.txt", 'r') as f:
    line = f.readline()
    while line != '':  # The EOF char is an empty string
        frequent_words.add(line.strip())
        line = f.readline()

def filter_rhymes(word):
    filter_list = ['to', 'on', 'has', 'but', 'the', 'in', 'and', 'a', 'aitch', 'angst', 'arugula', 'beige', 'blitzed', 'boing', 'bombed', 'cairn', 'chaos', 'chocolate', 'circle', 'circus', 'cleansed', 'coif', 'cusp', 'doth', 'else', 'eth', 'fiends', 'film', 'flange', 'fourths', 'grilse', 'gulf', 'kiln', 'loge', 'midst', 'month', 'music', 'neutron', 'ninja', 'oblige', 'oink', 'opus', 'orange', 'pint', 'plagued', 'plankton', 'plinth', 'poem', 'poet', 'purple', 'quaich', 'rhythm', 'rouged', 'silver', 'siren', 'soldier', 'sylph', 'thesp', 'toilet', 'torsk', 'tufts', 'waltzed', 'wasp', 'wharves', 'width', 'woman', 'yttrium'] 
    if word in filter_list:
        return False
    else:
        return True

def remove_punctuation(text):
    text = re.sub(r'[^\w\s]', '', text)
    return text

def get_rhymes(inp, level):
    entries = nltk.corpus.cmudict.entries()
    syllables = [(word, syl) for word, syl in entries if word == inp]
    rhymes = []
    filtered_rhymes = set()
    for (word, syllable) in syllables:
        rhymes += [word for word, pron in entries if pron[-level:] == syllable[-level:]]
    
    for word in rhymes:
        if (word in frequent_words) and (word != inp):
            filtered_rhymes.add(word)
    return filtered_rhymes

def get_inputs_length(input):
    gpt2_tokenizer = GPT2TokenizerFast.from_pretrained("gpt2")
    input_ids = gpt2_tokenizer(input)['input_ids']
    return len(input_ids)

tokenizer = RobertaTokenizer.from_pretrained('roberta-base')
model = RobertaForMaskedLM.from_pretrained('roberta-base')
text_generation = pipeline("text-generation")
set_seed(0)
    
def get_prediction(sent):
    
    token_ids = tokenizer.encode(sent, return_tensors='pt')
    masked_position = (token_ids.squeeze() == tokenizer.mask_token_id).nonzero()
    masked_pos = [mask.item() for mask in masked_position ]

    with torch.no_grad():
        output = model(token_ids)

    last_hidden_state = output[0].squeeze()

    list_of_list =[]
    for index,mask_index in enumerate(masked_pos):
        words = []
        mask_hidden_state = last_hidden_state[mask_index]
        idx = torch.topk(mask_hidden_state, k=5, dim=0)[1]
        for i in idx:
            word = tokenizer.decode(i.item()).strip()
            if (remove_punctuation(word) != "") and (word != '</s>'):
                words.append(word)
        #words = [tokenizer.decode(i.item()).strip() for i in idx]
        list_of_list.append(words)
        print(f"Mask {index+1} Guesses: {words}")
    
    best_guess = ""
    for j in list_of_list:
        best_guess = best_guess+" "+j[0]
        
    return best_guess
    
def get_line(topic_summary, starting_words, inputs_len):
    starting_word = random.choice(starting_words)
    line = starting_word + text_generation(topic_summary + " " + starting_word, max_length=inputs_len + 6, do_sample=True, return_full_text=False)[0]['generated_text']
    return line

def get_rhyming_line(topic_summary, starting_words, rhyming_word, inputs_len):
    #gpt2_sentence = text_generation(topic_summary + " " + starting_words[i][j], max_length=no_of_words + 4, do_sample=False)[0]
    starting_word = random.choice(starting_words)
    print(f"\nGetting rhyming line with starting word '{starting_word}' and rhyming word '{rhyming_word}'")
    gpt2_sentence = text_generation(topic_summary + " " + starting_word, max_length=inputs_len + 2, do_sample=True, return_full_text=False)[0]
    #sentence = gpt2_sentence['generated_text'] + " ___ ___ ___ " + rhyming_words[i][j]
    sentence = starting_word + gpt2_sentence['generated_text'] + " ___ ___ ___ " + rhyming_word
    print(f"Original Sentence: {sentence}")
    if sentence[-1] != ".":
        sentence = sentence.replace("___","<mask>") + "."
    else:
        sentence = sentence.replace("___","<mask>")
    print(f"Original Sentence replaced with mask: {sentence}")
    print("\n")
 
    predicted_blanks = get_prediction(sentence)
    print(f"\nBest guess for fill in the blanks: {predicted_blanks}")
    return starting_word + gpt2_sentence['generated_text'] + predicted_blanks + " " + rhyming_word
    
from transformers import pipeline

def generate(topic):
    text_generation = pipeline("text-generation")

    limericks = []

    #topic = input("Please enter a topic: ")
    topic_summary = remove_punctuation(wikipedia.summary(topic))
    # if len(topic_summary) > 2000:
    #   topic_summary = topic_summary[:2000]
    word_list = topic_summary.split()
    topic_summary_len = len(topic_summary)
    no_of_words = len(word_list)
    inputs_len = get_inputs_length(topic_summary)
    print(f"Topic Summary: {topic_summary}")
    print(f"Topic Summary Length: {topic_summary_len}")
    print(f"No of Words in Summary: {no_of_words}")
    print(f"Length of Input IDs: {inputs_len}")

    starting_words = ["That", "Had", "Not", "But", "With", "I", "Because", "There", "Who", "She", "He", "To", "Whose", "In", "And", "When", "Or", "So", "The", "Of", "Every", "Whom"]

    # starting_words = [["That", "Had", "Not", "But", "That"], 
    #                   ["There", "Who", "She", "Tormenting", "Til"],
    #                   ["Relentless", "This", "First", "and", "then"],
    #                   ["There", "Who", "That", "To", "She"],
    #                   ["There", "Who", "Two", "Four", "Have"]]

    # rhyming_words = [["told", "bold", "woodchuck", "truck", "road"], 
    #                  ["Nice", "grease", "house", "spouse", "peace"],
    #                  ["deadlines", "lines", "edits", "credits", "wine"],
    #                  ["Lynn", "thin", "essayed", "lemonade", "in"],
    #                  ["beard", "feared", "hen", "wren", "beard"]]                 

    for i in range(5):
        print(f"\nGenerating limerick {i+1}")
        rhyming_words_125 = []
        while len(rhyming_words_125) < 3 or valid_rhyme == False:
            first_line = get_line(topic_summary, starting_words, inputs_len)
            #rhyming_words = pronouncing.rhymes(first_line.split()[-1])
            end_word = remove_punctuation(first_line.split()[-1])
            valid_rhyme = filter_rhymes(end_word)
            if valid_rhyme:
                print(f"\nFirst Line: {first_line}")
                rhyming_words_125 = list(get_rhymes(end_word, 3))
                print(f"Rhyming words for '{end_word}' are {rhyming_words_125}")
                limerick = first_line + "\n"

        rhyming_word = rhyming_words_125[0]
        second_line = get_rhyming_line(topic_summary, starting_words, rhyming_word, inputs_len)
        limerick += second_line + "\n"

        rhyming_words_34 = []
        while len(rhyming_words_34) < 2 or valid_rhyme == False:
            third_line = get_line(topic_summary, starting_words, inputs_len)
            print(f"\nThird Line: {third_line}")
            #rhyming_words = pronouncing.rhymes(first_line.split()[-1])
            end_word = remove_punctuation(third_line.split()[-1])
            valid_rhyme = filter_rhymes(end_word)
            print(f"Does '{end_word}'' have valid rhymes: {valid_rhyme}")
            rhyming_words_34 = list(get_rhymes(end_word, 3))
            print(f"Rhyming words for '{end_word}' are {rhyming_words_34}")
            if valid_rhyme and len(rhyming_words_34) > 1:
                limerick += third_line + "\n"

        rhyming_word = rhyming_words_34[0]
        fourth_line = get_rhyming_line(topic_summary, starting_words, rhyming_word, inputs_len)
        limerick += fourth_line + "\n"

        rhyming_word = rhyming_words_125[1]
        fifth_line = get_rhyming_line(topic_summary, starting_words, rhyming_word, inputs_len)
        limerick += fifth_line + "\n"

        limericks.append(limerick)

    print("\n")
    output = f"Generated {len(limericks)} limericks: \n"

    print(f"Generated {len(limericks)} limericks: \n")
    for limerick in limericks:
        print(limerick)
        output += limerick

    return output

interface = gr.Interface(fn=generate, inputs="text", outputs="text")
interface.launch(debug=True)