#!/usr/bin/env python3

# summarize https://www.youtube.com/watch?v=imzTxoEDH_g
# summarize https://www.sprocket.org/video/cheesemaking.mp4 summary.txt
# summarize podcast.mp3 summary.txt

import argparse
import os
import re
import subprocess
import tempfile
from datetime import datetime
from urllib.parse import urlparse

import jax.numpy as jnp
import moviepy.editor
import nltk
import yt_dlp as youtube_dl
from whisper_jax import FlaxWhisperPipline

from utils.file_utils import download_files, upload_files
from utils.log_utils import logger
from utils.run_utils import config
from utils.text_utilities import post_process_transcription, summarize
from utils.viz_utilities import create_talk_diff_scatter_viz, create_wordcloud

nltk.download('punkt', quiet=True)
nltk.download('stopwords', quiet=True)

WHISPER_MODEL_SIZE = config['DEFAULT']["WHISPER_MODEL_SIZE"]
NOW = datetime.now()


def init_argparse() -> argparse.ArgumentParser:
    """
    Parse the CLI arguments
    :return: parser object
    """
    parser = argparse.ArgumentParser(
            usage="%(prog)s [OPTIONS] <LOCATION> <OUTPUT>",
            description="Creates a transcript of a video or audio file, then"
                        " summarizes it using ChatGPT."
    )

    parser.add_argument("-l", "--language",
                        help="Language that the summary should be written in",
                        type=str,
                        default="english",
                        choices=['english', 'spanish', 'french', 'german',
                                 'romanian'])
    parser.add_argument("location")
    return parser


def main():
    parser = init_argparse()
    args = parser.parse_args()

    # Parse the location string that was given to us, and figure out if it's a
    # local file (audio or video), a YouTube URL, or a URL referencing an
    # audio or video file.
    url = urlparse(args.location)

    # S3 : Pull artefacts to S3 bucket ?

    media_file = ""
    if url.scheme == 'http' or url.scheme == 'https':
        # Check if we're being asked to retreive a YouTube URL, which is
        # handled differently, as we'll use a secondary site to download
        # the video first.
        if re.search('youtube.com', url.netloc, re.IGNORECASE):
            # Download the lowest resolution YouTube video
            # (since we're just interested in the audio).
            # It will be saved to the current directory.
            logger.info("Downloading YouTube video at url: " + args.location)

            # Create options for the download
            ydl_opts = {
                    'format': 'bestaudio/best',
                    'postprocessors': [{
                            'key': 'FFmpegExtractAudio',
                            'preferredcodec': 'mp3',
                            'preferredquality': '192',
                    }],
                    'outtmpl': 'audio',  # Specify output file path and name
            }

            # Download the audio
            with youtube_dl.YoutubeDL(ydl_opts) as ydl:
                ydl.download([args.location])
            media_file = "audio.mp3"

            logger.info("Saved downloaded YouTube video to: " + media_file)
        else:
            # XXX - Download file using urllib, check if file is
            # audio/video using python-magic
            logger.info(f"Downloading file at url: {args.location}")
            logger.info("  XXX - This method hasn't been implemented yet.")
    elif url.scheme == '':
        media_file = url.path
        # If file is not present locally, take it from S3 bucket
        if not os.path.exists(media_file):
            download_files([media_file])

        if media_file.endswith(".m4a"):
            subprocess.run(["ffmpeg", "-i", media_file, f"{media_file}.mp4"])
            media_file = f"{media_file}.mp4"
    else:
        print("Unsupported URL scheme: " + url.scheme)
        quit()

    # Handle video
    if not media_file.endswith(".mp3"):
        try:
            video = moviepy.editor.VideoFileClip(media_file)
            audio_filename = tempfile.NamedTemporaryFile(suffix=".mp3",
                                                         delete=False).name
            video.audio.write_audiofile(audio_filename, logger=None)
            logger.info(f"Extracting audio to: {audio_filename}")
        # Handle audio only file
        except Exception:
            audio = moviepy.editor.AudioFileClip(media_file)
            audio_filename = tempfile.NamedTemporaryFile(suffix=".mp3",
                                                         delete=False).name
            audio.write_audiofile(audio_filename, logger=None)
    else:
        audio_filename = media_file

    logger.info("Finished extracting audio")
    logger.info("Transcribing")
    # Convert the audio to text using the OpenAI Whisper model
    pipeline = FlaxWhisperPipline("openai/whisper-" + WHISPER_MODEL_SIZE,
                                  dtype=jnp.float16,
                                  batch_size=16)
    whisper_result = pipeline(audio_filename, return_timestamps=True)
    logger.info("Finished transcribing file")

    whisper_result = post_process_transcription(whisper_result)

    transcript_text = ""
    for chunk in whisper_result["chunks"]:
        transcript_text += chunk["text"]

    with open("./artefacts/transcript_" + NOW.strftime("%m-%d-%Y_%H:%M:%S") +
              ".txt", "w") as transcript_file:
        transcript_file.write(transcript_text)

    with open("./artefacts/transcript_with_timestamp_" +
              NOW.strftime("%m-%d-%Y_%H:%M:%S") + ".txt",
              "w") as transcript_file_timestamps:
        transcript_file_timestamps.write(str(whisper_result))

    logger.info("Creating word cloud")
    create_wordcloud(NOW)

    logger.info("Performing talk-diff and talk-diff visualization")
    create_talk_diff_scatter_viz(NOW)

    # S3 : Push artefacts to S3 bucket
    prefix = "./artefacts/"
    suffix = NOW.strftime("%m-%d-%Y_%H:%M:%S")
    files_to_upload = [prefix + "transcript_" + suffix + ".txt",
                       prefix + "transcript_with_timestamp_" + suffix + ".txt",
                       prefix + "df_" + suffix + ".pkl",
                       prefix + "wordcloud_" + suffix + ".png",
                       prefix + "mappings_" + suffix + ".pkl",
                       prefix + "scatter_" + suffix + ".html"]
    upload_files(files_to_upload)

    summarize(transcript_text, NOW, False, False)

    logger.info("Summarization completed")

    # Summarization takes a lot of time, so do this separately at the end
    files_to_upload = ["summary_" + suffix + ".txt"]
    upload_files(files_to_upload)


if __name__ == "__main__":
    main()