import whisper
from pytube import YouTube
from transformers import pipeline
import gradio as gr
import os
import re

model = whisper.load_model("base")
summarizer = pipeline("summarization")

def get_audio(url):
  yt = YouTube(url)
  if yt.length < 540:
    video = yt.streams.filter(only_audio=True).first()
    out_file=video.download(output_path=".")
    base, ext = os.path.splitext(out_file)
    new_file = base+'.mp3'
    os.rename(out_file, new_file)
    a = new_file
    return a
  else:
    raise gr.Error("Videos for transcription on this space are limited to 1.5 hours.")
    return ""

def get_text(url):
  if url != '' : output_text_transcribe = ''
  result = model.transcribe(get_audio(url))
  return result['text'].strip()

def get_summary(article):
  first_sentences = ' '.join(re.split(r'(?<=[.:;])\s', article)[:5])
  b = summarizer(first_sentences, min_length = 20, max_length = 120, do_sample = False)
  b = b[0]['summary_text'].replace(' .', '.').strip()
  
  return b
  
with gr.Blocks() as demo:
  gr.Markdown("<h1><center>Free Fast YouTube URL Video-to-Text using <a href=https://openai.com/blog/whisper/ target=_blank>OpenAI's Whisper</a> Model</center></h1>")
  gr.Markdown("<center>Enter the link of any YouTube video to generate a text transcript of the video and then create a summary of the video transcript.</center>")
  gr.Markdown("<center><b>'Whisper is a neural net that approaches human level robustness and accuracy on English speech recognition.'</b></center>")
  gr.Markdown("<center>Transcription takes 5-10 seconds per minute of the video (bad audio/hard accents slow it down a bit). #patience<br />If you have time while waiting, check out my <a href=https://www.artificial-intelligence.blog target=_blank>AI blog</a> (opens in new tab).</center>")

  input_text_url = gr.Textbox(placeholder='Youtube video URL', label='URL')
  result_button_transcribe = gr.Button('1. Transcribe')
  output_text_transcribe = gr.Textbox(placeholder='Transcript of the YouTube video.', label='Transcript')

  result_button_summary = gr.Button('2. Create Summary')
  output_text_summary = gr.Textbox(placeholder='Summary of the YouTube video transcript.', label='Summary')

  result_button_transcribe.click(get_text, inputs = input_text_url, outputs = output_text_transcribe)
  result_button_summary.click(get_summary, inputs = output_text_transcribe, outputs = output_text_summary)

demo.queue(default_enabled=False).launch(debug = True)