import time
import os
import re

import torch
import torchaudio

import gradio as gr
import spaces
from transformers import AutoFeatureExtractor, AutoTokenizer, WhisperForConditionalGeneration, WhisperProcessor, pipeline
from huggingface_hub import model_info
try:
    import flash_attn
    FLASH_ATTENTION = True
except ImportError:
    FLASH_ATTENTION = False

import yt_dlp  # Added import for yt-dlp

MODEL_NAME = "NbAiLab/nb-whisper-large"
max_audio_length = 30 * 60

share = (os.environ.get("SHARE", "False")[0].lower() in "ty1") or None
auth_token = os.environ.get("AUTH_TOKEN") or True
device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
print(f"Bruker enhet: {device}")

@spaces.GPU(duration=60 * 2)
def pipe(file, return_timestamps=False, lang="no"):
    asr = pipeline(
        task="automatic-speech-recognition",
        model=MODEL_NAME,
        chunk_length_s=28,
        device=device,
        token=auth_token,
        torch_dtype=torch.float16,
        model_kwargs={"attn_implementation": "flash_attention_2", "num_beams": 5, "language": lang} if FLASH_ATTENTION else {"attn_implementation": "sdpa", "num_beams": 5},
    )
    asr.model.config.forced_decoder_ids = asr.tokenizer.get_decoder_prompt_ids(
        language=lang,
        task="transcribe",
        no_timestamps=not return_timestamps,
    )
    return asr(file, return_timestamps=return_timestamps, batch_size=24, generate_kwargs={'task': 'transcribe', 'language': lang})

def format_output(text):
    text = re.sub(r'(\.{3,}|[.!:?])', lambda m: m.group() + '<br>', text)
    return text

def transcribe(file, return_timestamps=False, lang_nn=False):
    
    waveform, sample_rate = torchaudio.load(file)
    audio_duration = waveform.size(1) / sample_rate 
    warning_message = None

    if audio_duration > max_audio_length:
        warning_message = (
            "<b style='color:red;'>⚠️ Advarsel:</b> "
            "Lydfilen er lengre enn 30 minutter. Kun de første 30 minuttene vil bli transkribert."
        )
        waveform = waveform[:, :int(max_audio_length * sample_rate)]
        truncated_file = "truncated_audio.wav"
        torchaudio.save(truncated_file, waveform, sample_rate)
        file_to_transcribe = truncated_file
        truncated = True
    else:
        file_to_transcribe = file
        truncated = False

    if not lang_nn:    
        if not return_timestamps:
            text = pipe(file_to_transcribe)["text"]
            formatted_text = format_output(text)
        else:
            chunks = pipe(file_to_transcribe, return_timestamps=True)["chunks"]
            text = []
            for chunk in chunks:
                start_time = time.strftime('%H:%M:%S', time.gmtime(chunk["timestamp"][0])) if chunk["timestamp"][0] is not None else "??:??:??"
                end_time = time.strftime('%H:%M:%S', time.gmtime(chunk["timestamp"][1])) if chunk["timestamp"][1] is not None else "??:??:??"
                line = f"[{start_time} -> {end_time}] {chunk['text']}"
                text.append(line)
            formatted_text = "<br>".join(text)
    else:
        if not return_timestamps:
            text = pipe(file_to_transcribe, lang="nn")["text"]
            formatted_text = format_output(text)
        else:
            chunks = pipe(file_to_transcribe, return_timestamps=True, lang="nn")["chunks"]
            text = []
            for chunk in chunks:
                start_time = time.strftime('%H:%M:%S', time.gmtime(chunk["timestamp"][0])) if chunk["timestamp"][0] is not None else "??:??:??"
                end_time = time.strftime('%H:%M:%S', time.gmtime(chunk["timestamp"][1])) if chunk["timestamp"][1] is not None else "??:??:??"
                line = f"[{start_time} -> {end_time}] {chunk['text']}"
                text.append(line)
            formatted_text = "<br>".join(text)
            
    output_file = "transcription.txt"
    with open(output_file, "w") as f:
        f.write(re.sub('<br>', '\n', formatted_text))
        
    if truncated:
        link="https://github.com/NbAiLab/nostram/blob/main/leverandorer.md"
        disclaimer = (
            "\n\n Dette er en demo. Det er ikke tillatt å bruke denne teksten i profesjonell sammenheng. "
            "Vi anbefaler at hvis du trenger å transkribere lengre opptak, så kjører du enten modellen lokalt "
            "eller sjekker denne siden for å se hvem som leverer løsninger basert på NB-Whisper: "
            f"<a href='{link}' target='_blank'>denne siden</a>."
        )
        formatted_text += f"<br><br><i>{disclaimer}</i>"
    
    formatted_text += "<br><br><i>Transkribert med NB-Whisper demo</i>"

    
    return warning_message, formatted_text, output_file

def _return_yt_html_embed(yt_url):
    video_id = yt_url.split("?v=")[-1]
    HTML_str = (
        f'<center> <iframe width="500" height="320" src="https://www.youtube.com/embed/{video_id}"> </iframe>'
        " </center>"
    )
    return HTML_str

def yt_transcribe(yt_url, return_timestamps=False):
    html_embed_str = _return_yt_html_embed(yt_url)

    ydl_opts = {
        'format': 'bestaudio/best',
        'outtmpl': 'audio.%(ext)s',
        'postprocessors': [{
            'key': 'FFmpegExtractAudio',
            'preferredcodec': 'mp3',
            'preferredquality': '192',
        }],
        'quiet': True,
    }
    with yt_dlp.YoutubeDL(ydl_opts) as ydl:
        ydl.download([yt_url])

    text = transcribe("audio.mp3", return_timestamps=return_timestamps)

    return html_embed_str, text

# Lag Gradio-appen uten faner

demo = gr.Blocks(theme=gr.themes.Default(primary_hue=gr.themes.colors.red, secondary_hue=gr.themes.colors.red))

with demo:

    with gr.Column():
        gr.HTML(f"<img src='file/Logonew.png' style='width:190px;'>")
        with gr.Column(scale=8):
            # Use Markdown for title and description
            gr.Markdown(
                """
                <h1 style="font-size: 3.5em;">NB-Whisper Demo</h1>
                """
            )

    mf_transcribe = gr.Interface(
        fn=transcribe,
        inputs=[
            gr.components.Audio(sources=['upload', 'microphone'], type="filepath"),
            gr.components.Checkbox(label="Inkluder tidskoder"),
            gr.components.Checkbox(label="Nynorsk"),
        ],
        
        outputs=[
            gr.HTML(label="Varsel"),
            gr.HTML(label="text"),
            gr.File(label="Last ned transkripsjon")  # Removed right side space in the box
        ],
        
        description=(
            "Demoen bruker"
            f" modellen [{MODEL_NAME}](https://huggingface.co/{MODEL_NAME}) til å transkribere lydfiler opp til 30 minutter."
        ),
        allow_flagging="never",
    )

# Start demoen uten faner
demo.launch(share=share, show_api=False, allowed_paths=["Logonew.png"]).queue()