import torch

import gradio as gr
import yt_dlp as youtube_dl
from transformers import pipeline
from transformers.pipelines.audio_utils import ffmpeg_read

import tempfile
import os

MODEL_NAME = "openai/whisper-large-v3"
BATCH_SIZE = 8
FILE_LIMIT_MB = 100000
YT_LENGTH_LIMIT_S = 360000  # limit to 1 hour YouTube files


device = 0 if torch.cuda.is_available() else "cpu"
pipe = pipeline(
    task="automatic-speech-recognition",
    model=MODEL_NAME,
    chunk_length_s=30,
    device=device,
)

all_special_ids = pipe.tokenizer.all_special_ids
transcribe_token_id = all_special_ids[-5]
translate_token_id = all_special_ids[-6]

def transcribe(microphone, file_upload, task):
    warn_output = ""
    if (microphone is not None) and (file_upload is not None):
        warn_output = (
            "警告：您已经上传了一个音频文件并使用了麦克录制。 "
            "录制文件将被使用上传的音频将被丢弃。"
        )
    elif (microphone is None) and (file_upload is None):
        return "错误: 您必须使用麦克风录制或上传音频文件"

    file = microphone if microphone is not None else file_upload
    pipe.model.config.forced_decoder_ids = [
        [2, transcribe_token_id if task == "transcribe" else translate_token_id]
    ]
    # text = pipe(file, return_timestamps=True)["text"]
    text = pipe(file, return_timestamps=True)
    # trans to SRT
    text = convert_to_srt(text)
    return warn_output + text

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 download_yt_audio(yt_url, filename):
    info_loader = youtube_dl.YoutubeDL()
    
    try:
        info = info_loader.extract_info(yt_url, download=False)
    except youtube_dl.utils.DownloadError as err:
        raise gr.Error(str(err))
    
    file_length = info["duration_string"]
    file_h_m_s = file_length.split(":")
    file_h_m_s = [int(sub_length) for sub_length in file_h_m_s]
    
    if len(file_h_m_s) == 1:
        file_h_m_s.insert(0, 0)
    if len(file_h_m_s) == 2:
        file_h_m_s.insert(0, 0)
    file_length_s = file_h_m_s[0] * 3600 + file_h_m_s[1] * 60 + file_h_m_s[2]
    
    if file_length_s > YT_LENGTH_LIMIT_S:
        yt_length_limit_hms = time.strftime("%HH:%MM:%SS", time.gmtime(YT_LENGTH_LIMIT_S))
        file_length_hms = time.strftime("%HH:%MM:%SS", time.gmtime(file_length_s))
        raise gr.Error(f"Maximum YouTube length is {yt_length_limit_hms}, got {file_length_hms} YouTube video.")
    
    ydl_opts = {"outtmpl": filename, "format": "worstvideo[ext=mp4]+bestaudio[ext=m4a]/best[ext=mp4]/best"}
    
    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        try:
            ydl.download([yt_url])
        except youtube_dl.utils.ExtractorError as err:
            raise gr.Error(str(err))


def yt_transcribe(yt_url, task):
    html_embed_str = _return_yt_html_embed(yt_url)

    with tempfile.TemporaryDirectory() as tmpdirname:
        filepath = os.path.join(tmpdirname, "video.mp4")
        download_yt_audio(yt_url, filepath)
        with open(filepath, "rb") as f:
            inputs = f.read()

    inputs = ffmpeg_read(inputs, pipe.feature_extractor.sampling_rate)
    inputs = {"array": inputs, "sampling_rate": pipe.feature_extractor.sampling_rate}

    
    text = pipe(inputs,return_timestamps=True)    
    # text = pipe(inputs, batch_size=BATCH_SIZE, generate_kwargs={"language":"zh"}, return_timestamps=True)
    # text = pipe(inputs, batch_size=BATCH_SIZE, generate_kwargs={"task": task}, return_timestamps=True)["text"]
    # text = pipe("audio.mp3",return_timestamps=True)
    #trans to SRT
    text= convert_to_srt(text)
    return html_embed_str, text


demo = gr.Blocks()
mf_transcribe = gr.Interface(
    fn=transcribe,
    inputs=[
        gr.inputs.Audio(source="microphone", type="filepath", optional=True),
        gr.inputs.Audio(source="upload", type="filepath", optional=True),
        gr.inputs.Radio(["transcribe", "translate"], label="Task", default="transcribe"),
    ],
    outputs="text",
    layout="horizontal",
    theme="huggingface",
    title="Audio-to-Text-SRT 自动生成字幕",
    description=(
        "直接在网页录音或上传音频文件，加入Youtube连接，轻松转换为文字和字幕格式! 本演示采用"
        f" 模型 [{MODEL_NAME}](https://huggingface.co./{MODEL_NAME}) 和 🤗 Transformers 转换任意长度的"
        "音视频文件!使用GPU转换效率会大幅提高，大约每小时 $0.6 约相当于人民币 5 元。 如果您有较长内容,需要更快的转换速度，请私信作者微信 1259388，并备注“语音转文字”"
    ),
    allow_flagging="never",
)
yt_transcribe = gr.Interface(
    fn=yt_transcribe,
    inputs=[
        gr.inputs.Textbox(lines=1, placeholder="Paste the URL to a YouTube video here", label="YouTube URL"),
        gr.inputs.Radio(["转译", "翻译"], label="Task", default="transcribe")
    ],
    outputs=["html", "text"],
    layout="horizontal",
    theme="huggingface",
    title="Audio-to-Text-SRT 自动生成字幕",
    description=(
      "直接在网页录音或上传音频文件，加入Youtube连接，轻松转换为文字和字幕格式! 本演示采用"
        f" 模型 [{MODEL_NAME}](https://huggingface.co./{MODEL_NAME}) 和 🤗 Transformers 转换任意长度的"
        "音视频文件!使用GPU转换效率会大幅提高，大约每小时 $0.6 约相当于人民币 5 元。 如果您有较长内容,需要更快的转换速度，请私信作者微信 1259388，并备注“语音转文字”"
    ),
    allow_flagging="never",
)

# # Load the images
# image1 = Image("wechatqrcode.jpg")
# image2 = Image("paypalqrcode.png")

# # Define a function that returns the images and captions
# def display_images():
#     return image1, "WeChat Pay", image2, "PayPal"

with demo:
    gr.TabbedInterface([mf_transcribe, yt_transcribe], ["转译音频成文字", "YouTube转字幕"])
# Create a gradio interface with no inputs and four outputs
# gr.Interface(display_images, [], [gr.outputs.Image(), gr.outputs.Textbox(), gr.outputs.Image(), gr.outputs.Textbox()], layout="horizontal").launch()
demo.launch(enable_queue=True)