import os
import gradio as gr
from transformers import pipeline
import spacy
import subprocess
import nltk
from nltk.corpus import wordnet

# Initialize the English text classification pipeline for AI detection
pipeline_en = pipeline(task="text-classification", model="Hello-SimpleAI/chatgpt-detector-roberta")

# Function to predict the label and score for English text (AI Detection)
def predict_en(text):
    res = pipeline_en(text)[0]
    return res['label'], res['score']

# Ensure necessary NLTK data is downloaded for Humanifier
nltk.download('wordnet')
nltk.download('omw-1.4')

# Ensure the SpaCy model is installed for Humanifier
try:
    nlp = spacy.load("en_core_web_sm")
except OSError:
    subprocess.run(["python", "-m", "spacy", "download", "en_core_web_sm"])
    nlp = spacy.load("en_core_web_sm")

# Function to get synonyms using NLTK WordNet and maintain original verb form
def get_synonym(word, pos_tag, original_token):
    synsets = wordnet.synsets(word)
    if not synsets:
        return word

    for synset in synsets:
        if synset.pos() == pos_tag:  # Match the part of speech
            synonym = synset.lemmas()[0].name()

            # Preserve the original verb form
            if original_token.tag_ in ["VBG", "VBN"]:  # Present or past participle
                return spacy_token_form(synonym, original_token.tag_)
            elif original_token.tag_ in ["VBZ"]:  # 3rd person singular
                return synonym + "s"
            else:
                return synonym

    return word

# Function to conjugate the synonym to the correct form based on the original token's tag
def spacy_token_form(synonym, tag):
    if tag == "VBG":  # Gerund or present participle
        return synonym + "ing" if not synonym.endswith("ing") else synonym
    elif tag == "VBN":  # Past participle
        return synonym + "ed" if not synonym.endswith("ed") else synonym
    return synonym

# Function to rephrase text and replace words with their synonyms while maintaining form
def rephrase_with_synonyms(text):
    doc = nlp(text)
    rephrased_text = []

    for token in doc:
        # Get the correct POS tag for WordNet
        pos_tag = None
        if token.pos_ == "NOUN":
            pos_tag = wordnet.NOUN
        elif token.pos_ == "VERB":
            pos_tag = wordnet.VERB
        elif token.pos_ == "ADJ":
            pos_tag = wordnet.ADJ
        elif token.pos_ == "ADV":
            pos_tag = wordnet.ADV
        
        if pos_tag:
            synonym = get_synonym(token.text, pos_tag, token)
            rephrased_text.append(synonym)
        else:
            rephrased_text.append(token.text)

    return ' '.join(rephrased_text)

# Function to paraphrase and correct grammar
def paraphrase_and_correct(text):
    paraphrased_text = capitalize_sentences_and_nouns(text)  # Capitalize first to ensure proper noun capitalization
    
    # Apply grammatical corrections
    paraphrased_text = correct_article_errors(paraphrased_text)
    paraphrased_text = correct_singular_plural_errors(paraphrased_text)
    paraphrased_text = correct_tense_errors(paraphrased_text)
    
    # Rephrase with synonyms while maintaining grammatical forms
    paraphrased_text = rephrase_with_synonyms(paraphrased_text)
    
    return paraphrased_text

# Gradio app setup with two tabs
with gr.Blocks() as demo:
    with gr.Tab("AI Detection"):
        t1 = gr.Textbox(lines=5, label='Text')
        button1 = gr.Button("🤖 Predict!")
        label1 = gr.Textbox(lines=1, label='Predicted Label 🎃')
        score1 = gr.Textbox(lines=1, label='Prob')

        # Connect the prediction function to the button
        button1.click(predict_en, inputs=[t1], outputs=[label1, score1], api_name='predict_en')
    
    with gr.Tab("Humanifier"):
        text_input = gr.Textbox(lines=5, label="Input Text")
        paraphrase_button = gr.Button("Paraphrase & Correct")
        output_text = gr.Textbox(label="Paraphrased Text")

        # Connect the paraphrasing function to the button
        paraphrase_button.click(paraphrase_and_correct, inputs=text_input, outputs=output_text)

# Launch the app with the remaining functionalities
demo.launch(share=True)