from __future__ import unicode_literals
import youtube_dl
import yt_dlp
from pydub import AudioSegment
from pyannote.audio import Pipeline
import re
import whisper
import os
import ffmpeg
import subprocess
import gradio as gr
import traceback
import json
pipeline = Pipeline.from_pretrained("pyannote/speaker-diarization", use_auth_token="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")
from pydub.effects import speedup
import moviepy.editor as mp
import datetime
import torch
import pyannote.audio
from pyannote.audio.pipelines.speaker_verification import PretrainedSpeakerEmbedding
from pyannote.audio import Audio
from pyannote.core import Segment
import wave
import contextlib
from sklearn.cluster import AgglomerativeClustering
import numpy as np


__FILES = set()
      

def CreateFile(filename):
    __FILES.add(filename)
    return filename

def RemoveFile(filename):
    if (os.path.isfile(filename)):
        os.remove(filename)

def RemoveAllFiles():
    for file in __FILES:
        if (os.path.isfile(file)):
            os.remove(file)
    
def Transcribe_V1(NumberOfSpeakers, SpeakerNames="", audio="temp_audio.wav"):
    SPEAKER_DICT = {}
    SPEAKERS = [speaker.strip() for speaker in SpeakerNames.split(',') if len(speaker)]
    
    def GetSpeaker(sp):
        speaker = sp
        if sp not in list(SPEAKER_DICT.keys()):
            if len(SPEAKERS):
                t = SPEAKERS.pop(0)
                SPEAKER_DICT[sp] = t
                speaker = SPEAKER_DICT[sp]
        else:
            speaker = SPEAKER_DICT[sp]
        return speaker
        
    def millisec(timeStr):
        spl = timeStr.split(":")
        s = (int)((int(spl[0]) * 60 * 60 + int(spl[1]) * 60 + float(spl[2]) )* 1000)
        return s
    
    def preprocess(audio):
        t1 = 0 * 1000 
        t2 = 20 * 60 * 1000
        newAudio = AudioSegment.from_wav(audio)
        a = newAudio[t1:t2]
        spacermilli = 2000
        spacer = AudioSegment.silent(duration=spacermilli)
        newAudio = spacer.append(a, crossfade=0)
        newAudio.export(audio, format="wav")
        return spacermilli, spacer
    
    def diarization(audio):
        as_audio = AudioSegment.from_wav(audio)
        DEMO_FILE = {'uri': 'blabal', 'audio': audio}
        if NumberOfSpeakers:
            dz = pipeline(DEMO_FILE, num_speakers=NumberOfSpeakers)  
        else:
            dz = pipeline(DEMO_FILE)  
        with open(CreateFile(f"diarization_{audio}.txt"), "w") as text_file:
            text_file.write(str(dz))
        dz = open(CreateFile(f"diarization_{audio}.txt")).read().splitlines()
        dzList = []
        for l in dz:
            start, end =  tuple(re.findall('[0-9]+:[0-9]+:[0-9]+\.[0-9]+', string=l))
            start = millisec(start)
            end = millisec(end)
            lex = GetSpeaker(re.findall('(SPEAKER_[0-9][0-9])', string=l)[0])
            dzList.append([start, end, lex])
        sounds = spacer
        segments = []
        dz = open(CreateFile(f"diarization_{audio}.txt")).read().splitlines()
        for l in dz:
            start, end =  tuple(re.findall('[0-9]+:[0-9]+:[0-9]+\.[0-9]+', string=l))
            start = millisec(start)
            end = millisec(end) 
            segments.append(len(sounds))
            sounds = sounds.append(as_audio[start:end], crossfade=0)
            sounds = sounds.append(spacer, crossfade=0)
        sounds.export(CreateFile(f"dz_{audio}.wav"), format="wav")
        return f"dz_{audio}.wav", dzList, segments
    
    def transcribe(dz_audio):
        model = whisper.load_model("medium")
        result = model.transcribe(dz_audio)
        # for _ in result['segments']:
        #     print(_['start'], _['end'], _['text'])
        captions = [[((caption["start"]*1000)), ((caption["end"]*1000)),  caption["text"]] for caption in result['segments']]
        conversation = []
        for i in range(len(segments)):
            idx = 0
            for idx in range(len(captions)):
                if captions[idx][0] >= (segments[i] - spacermilli):
                    break;
            
            while (idx < (len(captions))) and ((i == len(segments) - 1) or (captions[idx][1] < segments[i+1])):
                  c = captions[idx]  
                  start = dzList[i][0] + (c[0] -segments[i])
                  if start < 0: 
                      start = 0
                  idx += 1
                  if not len(conversation):
                      conversation.append([dzList[i][2], c[2]])
                  elif conversation[-1][0] == dzList[i][2]:
                      conversation[-1][1] +=  c[2]
                  else:
                      conversation.append([dzList[i][2], c[2]])
                  #print(f"[{dzList[i][2]}] {c[2]}")
        return conversation, ("".join([f"{speaker} --> {text}\n" for speaker, text in conversation]))

    spacermilli, spacer = preprocess(audio)
    dz_audio, dzList, segments = diarization(audio)
    conversation, t_text = transcribe(dz_audio)
    RemoveAllFiles()
    return (t_text, ({ "data": [{"speaker": speaker, "text": text} for speaker, text in conversation]}))


def Transcribe_V2(num_speakers, speaker_names, audio="temp_audio.wav"):
    model = whisper.load_model("medium")
    embedding_model = PretrainedSpeakerEmbedding(
        "speechbrain/spkrec-ecapa-voxceleb",
        device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
    )
    SPEAKER_DICT = {}
    SPEAKERS = [speaker.strip() for speaker in speaker_names.split(',') if len(speaker)]
    def GetSpeaker(sp):
        speaker = sp
        if sp not in list(SPEAKER_DICT.keys()):
            if len(SPEAKERS):
                t = SPEAKERS.pop(0)
                SPEAKER_DICT[sp] = t
                speaker = SPEAKER_DICT[sp]
        else:
            speaker = SPEAKER_DICT[sp]
        return speaker
    
    # audio = Audio()
    def get_output(segments):
        # print(segments)
        conversation=[]
        for (i, segment) in enumerate(segments):
            # print(f"{i}, {segment["speaker"]}, {segments[i - 1]["speaker"]}, {}")
            if not len(conversation):
                conversation.append([GetSpeaker(segment["speaker"]), segment["text"].lstrip()])
            elif conversation[-1][0] == GetSpeaker(segment["speaker"]):
                conversation[-1][1] +=  segment["text"].lstrip()
            else:
                conversation.append([GetSpeaker(segment["speaker"]), segment["text"].lstrip()])
            # if i == 0 or segments[i - 1]["speaker"] != segment["speaker"]:
            #     if i != 0:
            #         conversation.append([GetSpeaker(segment["speaker"]), segment["text"][1:]]) # segment["speaker"] + ' ' + str(time(segment["start"])) + '\n\n'
            # conversation[-1][1] += segment["text"][1:]
        # return output
        return ("".join([f"{speaker} --> {text}\n" for speaker, text in conversation])), ({ "data": [{"speaker": speaker, "text": text} for speaker, text in conversation]})

    def get_duration(path):
        with contextlib.closing(wave.open(path,'r')) as f:
            frames = f.getnframes()
            rate = f.getframerate()
        return frames / float(rate)

    def make_embeddings(path, segments, duration):
        embeddings = np.zeros(shape=(len(segments), 192))
        for i, segment in enumerate(segments):
            embeddings[i] = segment_embedding(path, segment, duration)
        return np.nan_to_num(embeddings)

    def segment_embedding(path, segment, duration):
        start = segment["start"]
        # Whisper overshoots the end timestamp in the last segment
        end = min(duration, segment["end"])
        clip = Segment(start, end)
        waveform, sample_rate = Audio().crop(path, clip)
        return embedding_model(waveform[None])

    def add_speaker_labels(segments, embeddings, num_speakers):
        clustering = AgglomerativeClustering(num_speakers).fit(embeddings)
        labels = clustering.labels_
        for i in range(len(segments)):
            segments[i]["speaker"] = 'SPEAKER ' + str(labels[i] + 1)

    def time(secs):
        return datetime.timedelta(seconds=round(secs))

    duration = get_duration(audio)
    if duration > 4 * 60 * 60:
        return "Audio duration too long"

    result = model.transcribe(audio)

    segments = result["segments"]

    num_speakers = min(max(round(num_speakers), 1), len(segments))
    if len(segments) == 1:
        segments[0]['speaker'] = 'SPEAKER 1'
    else:
        embeddings = make_embeddings(audio, segments, duration)
        add_speaker_labels(segments, embeddings, num_speakers)
    return get_output(segments)
    # return output

def AudioTranscribe(NumberOfSpeakers=None, SpeakerNames="", audio="", retries=5):
    print(f"{NumberOfSpeakers}, {SpeakerNames}, {retries}")
    if retries:
        # subprocess.call(['ffmpeg', '-i', audio,'temp_audio.wav'])
        try:
            subprocess.call(['ffmpeg', '-i', audio,'temp_audio.wav'])
        except Exception as ex:
            traceback.print_exc()
            return AudioTranscribe(NumberOfSpeakers, SpeakerNames, audio, retries-1)
        if not (os.path.isfile("temp_audio.wav")):
            return AudioTranscribe(NumberOfSpeakers, SpeakerNames, audio, retries-1)
        return Transcribe_V1(NumberOfSpeakers, SpeakerNames)
    else:
        raise gr.Error("There is some issue ith Audio Transcriber. Please try again later!")

def VideoTranscribe(NumberOfSpeakers=None, SpeakerNames="", video="", retries=5):
    if retries:
        try:
            clip = mp.VideoFileClip(video)
            clip.audio.write_audiofile("temp_audio.wav")
            # command = f"ffmpeg -i {video} -ab 160k -ac 2 -ar 44100 -vn temp_audio.wav"
            # subprocess.call(command, shell=True)
        except Exception as ex:
            traceback.print_exc()
            return VideoTranscribe(NumberOfSpeakers, SpeakerNames, video, retries-1)
        if not (os.path.isfile("temp_audio.wav")):
            return VideoTranscribe(NumberOfSpeakers, SpeakerNames, video, retries-1)
        return Transcribe_V1(NumberOfSpeakers, SpeakerNames)
    else:
        raise gr.Error("There is some issue ith Video Transcriber. Please try again later!")
    return Transcribe_V1(NumberOfSpeakers, SpeakerNames)

def YoutubeTranscribe(NumberOfSpeakers=None, SpeakerNames="", URL="", retries = 5):
    if retries:
        if "youtu" not in URL.lower():
            raise gr.Error(f"{URL} is not a valid youtube URL.")
        else:
            RemoveFile("temp_audio.wav")
            ydl_opts = {
                'format': 'bestaudio/best',
                'outtmpl': 'temp_audio.%(ext)s',
                'postprocessors': [{
                    'key': 'FFmpegExtractAudio',
                    'preferredcodec': 'wav',
                }],
            }
            try:
              with yt_dlp.YoutubeDL(ydl_opts) as ydl:
                  ydl.download([URL])
            except:
                return YoutubeTranscribe(NumberOfSpeakers, SpeakerNames, URL, retries-1)
            stream = ffmpeg.input('temp_audio.m4a')
            stream = ffmpeg.output(stream, 'temp_audio.wav')
            RemoveFile("temp_audio.m4a")
            return Transcribe_V1(NumberOfSpeakers, SpeakerNames)
    else:
        raise gr.Error(f"Unable to get video from {URL}")
 
ut = gr.Interface(
    fn=YoutubeTranscribe,
    inputs=[gr.Number(label="Number of Speakers", placeholder="2"), gr.Textbox(label="Name of the Speakers (ordered by the time they speak and separated by comma)", placeholder="If Speaker 1 is first to speak followed by Speaker 2 then -> Speaker 1, Speaker 2"), gr.Textbox(label="Youtube Link", placeholder="https://www.youtube.com/watch?v=GECcjrYHH8w"),],
    outputs=[gr.Textbox(label="Transcribed Text", lines=15), gr.JSON(label="Transcribed JSON")]
)
vt = gr.Interface(
    fn=VideoTranscribe,
    inputs=[gr.Number(label="Number of Speakers", placeholder="2"), gr.Textbox(label="Name of the Speakers (ordered by the time they speak and separated by comma)", placeholder="If Speaker 1 is first to speak followed by Speaker 2 then -> Speaker 1, Speaker 2"), 'video'],
    outputs=[gr.Textbox(label="Transcribed Text", lines=15), gr.JSON(label="Transcribed JSON")]
)
at = gr.Interface(
    fn=AudioTranscribe,
    inputs=[gr.Number(label="Number of Speakers", placeholder="2"), gr.Textbox(label="Name of the Speakers (ordered by the time they speak and separated by comma)", placeholder="If Speaker 1 is first to speak followed by Speaker 2 then -> Speaker 1, Speaker 2"), 'audio'],
    outputs=[gr.Textbox(label="Transcribed Text", lines=15), gr.JSON(label="Transcribed JSON")]
)

# demo = gr.TabbedInterface([ut, vt, at], ["Youtube URL", "Video", "Audio"])
# demo.launch()
with gr.Blocks() as yav_ui:
    with gr.Tab("Input"):
        with gr.Tab("Youtube", id=1):
            yinput_nos = gr.Number(label="Number of Speakers", placeholder="2")
            yinput_sn = gr.Textbox(label="Name of the Speakers (ordered by the time they speak and separated by comma)", placeholder="If Speaker 1 is first to speak followed by Speaker 2 then -> Speaker 1, Speaker 2")
            yinput = gr.Textbox(label="Youtube Link", placeholder="https://www.youtube.com/watch?v=GECcjrYHH8w")
            ybutton_transcribe = gr.Button("Transcribe")
        with gr.Tab("Video", id=2):
            vinput_nos = gr.Number(label="Number of Speakers", placeholder="2")
            vinput_sn = gr.Textbox(label="Name of the Speakers (ordered by the time they speak and separated by comma)", placeholder="If Speaker 1 is first to speak followed by Speaker 2 then -> Speaker 1, Speaker 2")
            vinput = gr.Video(label="Video")
            vbutton_transcribe = gr.Button("Transcribe")
        with gr.Tab("Audio", id=3):
            ainput_nos = gr.Number(label="Number of Speakers", placeholder="2")
            ainput_sn = gr.Textbox(label="Name of the Speakers (ordered by the time they speak and separated by comma)", placeholder="If Speaker 1 is first to speak followed by Speaker 2 then -> Speaker 1, Speaker 2")
            ainput = gr.Audio(label="Audio")
            abutton_transcribe = gr.Button("Transcribe")
    with gr.Tab("Output"):
        with gr.Tab("Text"):
            output_textbox = gr.Textbox(label="Transcribed Text", lines=15)
        with gr.Tab("JSON"):
            output_json = gr.JSON(label="Transcribed JSON")
    ybutton_transcribe.click(
                fn=YoutubeTranscribe,
                inputs=[yinput_nos,yinput_sn,yinput],
                outputs=[output_textbox,output_json]
            )
    abutton_transcribe.click(
                fn=AudioTranscribe,
                inputs=[ainput_nos,ainput_sn,ainput],
                outputs=[output_textbox,output_json]
            )
    vbutton_transcribe.click(
                fn=VideoTranscribe,
                inputs=[vinput_nos,vinput_sn,vinput],
                outputs=[output_textbox,output_json]
            )
yav_ui.launch(debug=True)