import gradio as gr
import math
import spacy
from datasets import load_dataset
from sentence_transformers import SentenceTransformer
from sentence_transformers import InputExample
from sentence_transformers import losses
from sentence_transformers import util
from transformers import pipeline
from transformers import AutoTokenizer, AutoModel, AutoModelForSequenceClassification
from transformers import TrainingArguments, Trainer
import torch
import torch.nn.functional as F
from torch.utils.data import DataLoader
import numpy as np
import evaluate
import nltk
from nltk.corpus import stopwords
import subprocess
import sys
import random

# !pip install https://huggingface.co/spacy/en_core_web_sm/resolve/main/en_core_web_sm-any-py3-none-any.whl
subprocess.check_call([sys.executable, '-m', 'pip', 'install', 'https://huggingface.co/spacy/en_core_web_sm/resolve/main/en_core_web_sm-any-py3-none-any.whl'])
# tokenizer = AutoTokenizer.from_pretrained('sentence-transformers/all-MiniLM-L6-v2')
nltk.download('stopwords')
nlp = spacy.load("en_core_web_sm")
stops = stopwords.words("english")
ROMAN_CONSTANTS = (
            ( "", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX" ),
            ( "", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC" ),
            ( "", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM" ),
            ( "", "M", "MM", "MMM", "",   "",  "-",  "",    "",     ""   ),
        )

# answer = "Pizza"
guesses = []
return_guesses = []
answer = "Moon"
word1 = "Black"
word2 = "White"
word3 = "Sun"


#Mean Pooling - Take attention mask into account for correct averaging
def mean_pooling(model_output, attention_mask):
    token_embeddings = model_output['token_embeddings'] #First element of model_output contains all token embeddings
    input_mask_expanded = attention_mask.unsqueeze(-1).expand(token_embeddings.size()).float()
    return torch.sum(token_embeddings * input_mask_expanded, 1) / torch.clamp(input_mask_expanded.sum(1), min=1e-9)


def normalize(comment, lowercase, remove_stopwords):
    if lowercase:
        comment = comment.lower()
    comment = nlp(comment)
    lemmatized = list()
    for word in comment:
        lemma = word.lemma_.strip()
        if lemma:
            if not remove_stopwords or (remove_stopwords and lemma not in stops):
                lemmatized.append(lemma)
    return " ".join(lemmatized)


# def tokenize_function(examples):
#     return tokenizer(examples["text"])


def compute_metrics(eval_pred):
    logits, labels = eval_pred
    predictions = np.argmax(logits, axis=-1)
    metric = evaluate.load("accuracy")
    return metric.compute(predictions=predictions, references=labels)


def training():
    dataset_id = "ag_news"
    dataset = load_dataset(dataset_id)
    # dataset = dataset["train"]
    # tokenized_datasets = dataset.map(tokenize_function, batched=True)
    
    print(f"- The {dataset_id} dataset has {dataset['train'].num_rows} examples.")
    print(f"- Each example is a {type(dataset['train'][0])} with a {type(dataset['train'][0]['text'])} as value.")
    print(f"- Examples look like this: {dataset['train'][0]}")
    
    # small_train_dataset = tokenized_datasets["train"].shuffle(seed=42).select(range(1000))
    # small_eval_dataset = tokenized_datasets["test"].shuffle(seed=42).select(range(1000))
    
    # dataset = dataset["train"].map(tokenize_function, batched=True)
    # dataset.set_format(type="torch", columns=["input_ids", "token_type_ids", "attention_mask", "label"])
    # dataset.format['type']
    
    # print(dataset)
    
    train_examples = []
    train_data = dataset["train"]
    # For agility we only 1/2 of our available data
    n_examples = dataset["train"].num_rows // 2
    
    for i in range(n_examples):
        example = train_data[i]
        # example_opposite = dataset_clean[-(i)]
        # print(example["text"])
        train_examples.append(InputExample(texts=[example['text']], label=example['label']))
        
    train_dataloader = DataLoader(train_examples, shuffle=True, batch_size=25)
    
    print("END DATALOADER")
    
    # print(train_examples)
        
    embeddings = finetune(train_dataloader)
    
    return (dataset['train'].num_rows, type(dataset['train'][0]), type(dataset['train'][0]['text']), dataset['train'][0], embeddings)


def finetune(train_dataloader):
    # model = AutoModelForSequenceClassification.from_pretrained("bert-base-cased", num_labels=5)
    model_id = "sentence-transformers/all-MiniLM-L6-v2"
    model = SentenceTransformer(model_id)
    
    # training_args = TrainingArguments(output_dir="test_trainer")
    
    # USE THIS LINK
    # https://huggingface.co/blog/how-to-train-sentence-transformers
    
    train_loss = losses.BatchHardSoftMarginTripletLoss(model=model)
    
    print("BEGIN FIT")
    
    model.fit(train_objectives=[(train_dataloader, train_loss)], epochs=10)
    
    model.save("ag_news_model")
    
    model.save_to_hub("smhavens/all-MiniLM-agNews")
    # accuracy = compute_metrics(eval, metric)
    
    # training_args = TrainingArguments(output_dir="test_trainer", evaluation_strategy="epoch")
    
    # trainer = Trainer(
    #     model=model,
    #     args=training_args,
    #     train_dataset=train,
    #     eval_dataset=eval,
    #     compute_metrics=compute_metrics,
    # )
    
    # trainer.train()
    
    
def get_model():
    model = SentenceTransformer("bert-analogies")
    device = torch.device('cuda:0')
    model = model.to(device)
    return model


def cosine_scores(model, sentence):
    global word1
    global word2
    global word3
    # sentence1 = f"{word1} is to {word2} as"
    embeddings1 = model.encode(sentence, convert_to_tensor=True)

def embeddings(model, sentences):
    gpu_available = torch.cuda.is_available()
    device = torch.device("cuda" if gpu_available else "cpu")
    # device = torch.device('cuda:0')
    embeddings = model.encode(sentences)
    global word1
    global word2
    global word3

    # Load model from HuggingFace Hub
    tokenizer = AutoTokenizer.from_pretrained('bert-analogies')
    encoded_input = tokenizer(sentences, padding=True, truncation=True, return_tensors='pt')
    token_ids = tokenizer.encode(sentences, return_tensors='pt')
    blank_id = tokenizer.mask_token_id
    blank_id_idx = torch.where(encoded_input["input_ids"] == blank_id)[1]
    
    encoded_input["input_ids"] = encoded_input["input_ids"].to(device)
    encoded_input["attention_mask"] = encoded_input["attention_mask"].to(device)
    encoded_input['token_type_ids'] = encoded_input['token_type_ids'].to(device)
    
    encoded_input['input'] = {'input_ids':encoded_input['input_ids'], 'attention_mask':encoded_input['attention_mask']}
    
    del encoded_input['input_ids']
    del encoded_input['token_type_ids']
    del encoded_input['attention_mask']

    with torch.no_grad():
        # output = model(encoded_input)
        print(encoded_input)
        model_output = model(**encoded_input)
        # output = model(encoded_input_topk)
    
    unmasker = pipeline('fill-mask', model='bert-analogies')
    guesses = unmasker(sentences)
    print(guesses)

    # Perform pooling
    sentence_embeddings = mean_pooling(model_output, encoded_input['input']["attention_mask"])

    # Normalize embeddings
    sentence_embeddings = F.normalize(sentence_embeddings, p=2, dim=1)

    potential_words = []
    for guess in guesses:
        temp_word = guess['token_str']
        if temp_word[0].isalpha() and temp_word not in stops and temp_word not in ROMAN_CONSTANTS:
            potential_words.append(guess['token_str'])

    return potential_words


def random_word():
    with open('ag_news_model/vocab.txt', 'r') as file:
        line = ""
        content = file.readlines()
        length = len(content)
        while line == "":
            rand_line = random.randrange(1997, length)
            
            if content[rand_line][0].isalpha() and content[rand_line][:-1] not in stops and content[rand_line][:-1] not in ROMAN_CONSTANTS:
                line = content[rand_line]
            else:
                print(f"{content[rand_line]} is not alpha or is a stop word")
        # for num, aline in enumerate(file, 1997):
        #     if random.randrange(num) and aline.isalpha():
        #         continue
        #     # elif not aline.isalpha():
                
        #     line = aline
    print(line)
    return line[:-1]


def generate_prompt(model):
    global word1
    global word2
    global word3
    global answer
    word1 = random_word()
    word2 = random_word()
    word3 = random_word()
    sentence = f"{word1} is to {word2} as {word3} is to [MASK]"
    print(sentence)
    answer = embeddings(model, sentence)[0]
    print("ANSWER IS", answer)
    # cosine_scores(model, sentence)


def greet(name):
    return "Hello " + name + "!!"

def check_answer(guess:str):
    global guesses
    global answer
    global return_guesses
    model = get_model()
    output = ""
    protected_guess = guess
    sentence = f"{word1} is to {word2} as [MASK] is to {guess}"
    other_word = embeddings(model, sentence)[0]
    guesses.append(guess)
    print("GUESS IS", guess)
    return_guess = f"{guess}: {word1} is to {word2} as {other_word} is to {guess}"
    print("GUESS IS", guess)
    return_guesses.append(return_guess)
    for guess in return_guesses:
        output += (guess + "\n")
    output = output[:-1]
    print("GUESS IS", protected_guess)
    
    print("IS", protected_guess, "EQUAL TO", answer, ":", protected_guess.lower() == answer.lower())
    if protected_guess.lower() == answer.lower():
        return "Correct!", output
    else:
        
        return "Try again!", output

def main():
    global word1
    global word2
    global word3
    global answer
    # answer = "Moon"
    global guesses
    
    
    # num_rows, data_type, value, example, embeddings = training()
    # sent_embeddings = embeddings()
    model = get_model() 
    generate_prompt(model)
    
    prompt = f"{word1} is to {word2} as {word3} is to ____"
    print(prompt)
    print("TESTING EMBEDDINGS")
    with gr.Blocks() as iface:
        gr.Markdown(prompt)
        with gr.Tab("Guess"):
            text_input = gr.Textbox()
            text_output = gr.Textbox()
            text_button = gr.Button("Submit")
        with gr.Accordion("Open for previous guesses"):
            text_guesses = gr.Textbox()
        # with gr.Tab("Testing"):
        #     gr.Markdown(f"""The Embeddings are {sent_embeddings}.""")
        text_button.click(check_answer, inputs=[text_input], outputs=[text_output, text_guesses])
    # iface = gr.Interface(fn=greet, inputs="text", outputs="text")
    iface.launch()
    
    


    
if __name__ == "__main__":
    main()