# Module Imports
from pytube import YouTube
import whisper
import gradio as gr
import time
import re
from happytransformer import HappyTextToText, TTSettings
from difflib import Differ

STTmodel = whisper.load_model("base.en")
GCmodel = HappyTextToText("T5", "Ragnov/T5-Base-Grammar-Checker")
args = TTSettings(num_beams=5, min_length=1)

# Functions
def transcribe(file):
    options = dict(task="transcribe", best_of=5)
    text = STTmodel.transcribe(file, **options)["text"]
    return text.strip()

def get_filename(file_obj):
    return file_obj.orig_name

def inference(link):
  yt = YouTube(link)
  path = yt.streams.filter(only_audio=True)[0].download(filename="audio.mp4")
  options = whisper.DecodingOptions(without_timestamps=True)
  results = STTmodel.transcribe(path)
  return results['text']

def populate_metadata(link):
  yt = YouTube(link)
  return yt.thumbnail_url, yt.title

def transcribe_file(file):
    options = dict(task="transcribe", best_of=5)
    file = get_filename(file)
    text = STTmodel.transcribe(file, **options)["text"]
    return text.strip()

def real_time_transcribe(audio, state=""):
    time.sleep(2)
    text = STTmodel.transcribe(audio)["text"]
    state += text + " "
    return state, state

def paragraph_to_sentences(paragraph):
    """
    This function takes a paragraph as input and returns a list of sentences.

    Args:
        paragraph (str): The paragraph to be converted to a list of sentences.

    Returns:
        list: A list of sentences extracted from the paragraph.
    """
    # Split the paragraph into sentences using a period, exclamation mark or question mark as the delimiter.
    sentences = re.split(r'(?<=[^A-Z].[.?!]) +(?=[A-Z])|(?<=[^A-Z][!]) +(?=[A-Z])', paragraph)

    # Remove any leading or trailing spaces from each sentence.
    sentences = [sentence.strip() for sentence in sentences]

    return sentences

def sentences_to_paragraph(sentences):
  final_result = ""
  for num, sentence in enumerate(sentences):
    result = GCmodel.generate_text("grammar: "+ sentence, args=args)
    final_result += result.text
    if num < len(sentences) - 1:
        final_result += " "

  return final_result

# Function that takes transcribed result and gramify it  
def gramify(paragraph):
  result_1 = paragraph_to_sentences(paragraph)
  final_result = sentences_to_paragraph(result_1)
  return final_result

# Function that takes transcribed text for its first inpu
def diff_texts(text1, text2):
    """
    This function takes transcribed text for its first input 
    and grammatically corrected text as its second input which return the difference
    of the two text.
    """
    d = Differ()
    return [
        (token[2:], token[0] if token[0] != " " else None)
        for token in d.compare(text1, text2)
    ]
res_diff = []
# Gradio Blocks
demo = gr.Blocks()
with demo:
    gr.Markdown(""" <p style="text-align: center;"> Speech To Text Grammar Checker </p>""")
    with gr.Tabs():
        with gr.TabItem("Voice Record"):
            with gr.Row():
              audio = gr.Audio(show_label=False,source="microphone",type="filepath")
              text_output1 = gr.Textbox(label="Transcription", placeholder="Text Output")
            with gr.Row():
              transcribe_button1 = gr.Button("Transcribe")
            with gr.Row():
              Grammar_text_output1 = gr.Textbox(label="Grammatically Corrected Text", placeholder="Text Output")
            with gr.Row():
              Diff_text_output1 = gr.HighlightedText(label="Text Difference",combine_adjacent=True,value=res_diff).style(color_map={"+": "green", "-": "red"})
        with gr.TabItem("Upload File"):
            with gr.Row():
                file_upload = gr.File()
                text_output2 = gr.Textbox(label="Transcription", placeholder="Text Output")
            with gr.Row():
              transcribe_button2 = gr.Button("Transcribe")
            with gr.Row():
              Grammar_text_output2 = gr.Textbox(label="Grammatically Corrected Text", placeholder="Text Output")
            with gr.Row():
              Diff_text_output2 = gr.HighlightedText(label="Text Difference",combine_adjacent=True,value=res_diff).style(color_map={"+": "green", "-": "red"})
        with gr.TabItem("Youtube Link"):
            with gr.Box():
                link = gr.Textbox(label="YouTube Link")
                with gr.Row().style(mobile_collapse=False, equal_height=True):
                  title = gr.Label(label="Video Title", placeholder="Title")
                  img = gr.Image(label="Thumbnail")
                text_link_output = gr.Textbox(label="Transcription", placeholder="Text Output",lines=5)
                with gr.Row().style(mobile_collapse=False, equal_height=True): 
                  transcribe_button3 = gr.Button("Transcribe")
                with gr.Row():
                  Grammar_text_output3 = gr.Textbox(label="Grammatically Corrected Text", placeholder="Text Output")
                with gr.Row().style(mobile_collapse=False, equal_height=True):
                  Diff_text_output3 = gr.HighlightedText(label="Text Difference",combine_adjacent=True,value=res_diff).style(color_map={"+": "green", "-": "red"})
        gr.Markdown("""<p style="text-align: center;"> Not Satisfied with the result? </br>
                <a href="https://forms.gle/yZA5DBygMUNmLZtv7">Click here to help us make it better.</a> 
                </p>""") 
    
        with gr.Accordion("About",open=False):
          gr.Markdown("""
            <p style="text-align: center;"> Thesis System presented by  <br/> <br/>
            • <b>Daniel L. Espinola</b> <br/>
            • <b>Jhon Vincent A. Gupo</b> <br/>
            • <b>Ryan M. Ibay</b> <br/> <br/>
            In partial fulfillment of the requirements for the degree <br/>   
            Bachelor of Science in Computer Science Specialized in Intelligent Systems <br/>
            Laguna State Polytechnic University - Los Baños Campus . <br/>  <br/> 
            We would also like to thank our fellow adviser and subject specialist for their guidance in making this idea a reality. <br/>
            • <b>Crisanto F. Gulay</b> - Adviser <br/>
            • <b>Gene Marck B. Catedrilla</b> - Subject Specialist <br/>
            </p>
            """)
          link.change(populate_metadata, inputs=[link], outputs=[img, title])

          # Transcription
          transcribe_button1.click(transcribe, inputs=audio, outputs=text_output1)
          transcribe_button2.click(transcribe_file, inputs=file_upload, outputs=text_output2)
          transcribe_button3.click(inference, inputs=link, outputs=text_link_output)

          # Gramify
          text_output1.change(gramify,inputs=text_output1,outputs=Grammar_text_output1)
          text_output2.change(gramify,inputs=text_output2,outputs=Grammar_text_output2)
          text_link_output.change(gramify, inputs=text_link_output ,outputs=Grammar_text_output3)

          # For Text Difference
          Grammar_text_output1.change(diff_texts,inputs=[text_output1,Grammar_text_output1],outputs=Diff_text_output1)
          Grammar_text_output2.change(diff_texts,inputs=[text_output2,Grammar_text_output2],outputs=Diff_text_output2)
          Grammar_text_output3.change(diff_texts,inputs=[text_link_output,Grammar_text_output3],outputs=Diff_text_output3)
     
demo.launch(share=True)