import spaces

import os
import re

import torch
import gradio as gr

import sys
sys.path.append('./videollama2')
from videollama2 import model_init, mm_infer
from videollama2.utils import disable_torch_init


title_markdown = ("""
<div style="display: flex; justify-content: center; align-items: center; text-align: center;">
  <a href="https://github.com/DAMO-NLP-SG/VideoLLaMA2" style="margin-right: 20px; text-decoration: none; display: flex; align-items: center;">
    <img src="https://s2.loli.net/2024/06/03/D3NeXHWy5az9tmT.png" alt="VideoLLaMA 2 🔥🚀🔥" style="max-width: 120px; height: auto;">
  </a>
  <div>
    <h1 >VideoLLaMA 2: Advancing Spatial-Temporal Modeling and Audio Understanding in Video-LLMs</h1>
    <h5 style="margin: 0;">If this demo please you, please give us a star ⭐ on Github or 💖 on this space.</h5>
  </div>
</div>


<div align="center">
    <div style="display:flex; gap: 0.25rem; margin-top: 10px;" align="center">
        <a href="https://github.com/DAMO-NLP-SG/VideoLLaMA2"><img src='https://img.shields.io/badge/Github-VideoLLaMA2-9C276A'></a>
        <a href="https://arxiv.org/pdf/2406.07476.pdf"><img src="https://img.shields.io/badge/Arxiv-2406.07476-AD1C18"></a>
        <a href="https://github.com/DAMO-NLP-SG/VideoLLaMA2/stargazers"><img src="https://img.shields.io/github/stars/DAMO-NLP-SG/VideoLLaMA2.svg?style=social"></a>
    </div>
</div>
""")


block_css = """
#buttons button {
    min-width: min(120px,100%);
    color: #9C276A
}
"""


tos_markdown = ("""
### Terms of use
By using this service, users are required to agree to the following terms:
The service is a research preview intended for non-commercial use only. It only provides limited safety measures and may generate offensive content. It must not be used for any illegal, harmful, violent, racist, or sexual purposes. The service may collect user dialogue data for future research.
Please click the "Flag" button if you get any inappropriate answer! We will collect those to keep improving our moderator.
For an optimal experience, please use desktop computers for this demo, as mobile devices may compromise its quality.
""")


learn_more_markdown = ("""
### License
This project is released under the Apache 2.0 license as found in the LICENSE file. The service is a research preview intended for non-commercial use ONLY, subject to the model Licenses of LLaMA and Mistral, Terms of Use of the data generated by OpenAI, and Privacy Practices of ShareGPT. Please get in touch with us if you find any potential violations.
""")


plum_color = gr.themes.colors.Color(
    name='plum',
    c50='#F8E4EF',
    c100='#E9D0DE',
    c200='#DABCCD',
    c300='#CBA8BC',
    c400='#BC94AB',
    c500='#AD809A',
    c600='#9E6C89',
    c700='#8F5878',
    c800='#804467',
    c900='#713056',
    c950='#662647',
)


class Chat:

    def __init__(self, model_path, load_8bit=False, load_4bit=False):
        disable_torch_init()

        self.model, self.processor, self.tokenizer = model_init(model_path, load_8bit=load_8bit, load_4bit=load_4bit)

    @spaces.GPU(duration=120)
    @torch.inference_mode()
    def generate(self, data: list, message, temperature, top_p, max_output_tokens):
        # TODO: support multiple turns of conversation.
        assert len(data) == 1

        tensor, modal = data[0]
        response = mm_infer(tensor, message, self.model, self.tokenizer, modal=modal.strip('<>'), 
            do_sample=True if temperature > 0.0 else False,
            temperature=temperature,
            top_p=top_p,
            max_new_tokens=max_output_tokens)

        return response


@spaces.GPU(duration=120)
def generate(video, audio, message, chatbot, va_tag, textbox_in, temperature, top_p, max_output_tokens, dtype=torch.float16):
    data = []
    image = None

    processor = handler.processor
    try:
        if image is not None:
            data.append((processor['image'](image).to(handler.model.device, dtype=dtype), '<image>'))
        elif video is not None:
            video_audio = processor['video'](video, va=va_tag=="Audio Vision")
            if va_tag=="Audio Vision":
                for k,v in video_audio.items():
                    video_audio[k] = v.to(handler.model.device, dtype=dtype)
            else:
                video_audio = video_audio.to(handler.model.device, dtype=dtype)
            data.append((video_audio, '<video>'))
        elif audio is not None:
            data.append((processor['audio'](audio).to(handler.model.device, dtype=dtype), '<audio>'))
        elif image is None and video is None:
            data.append((None, '<text>'))
        else:
            raise NotImplementedError("Not support image and video at the same time")
    except Exception as e:
        traceback.print_exc()
        return gr.update(value=None, interactive=True), gr.update(value=None, interactive=True), message, chatbot

    assert len(message) % 2 == 0, "The message should be a pair of user and system message."

    show_images = ""
    if image is not None:
        show_images += f'<img src="./file={image}" style="display: inline-block;width: 250px;max-height: 400px;">'
    if video is not None:
        show_images += f'<video controls playsinline width="500" style="display: inline-block;"  src="./file={video}"></video>'
    if audio is not None:
        show_images += f'<audio controls style="display: inline-block;" src="./file={audio}"></audio>'

    one_turn_chat = [textbox_in, None]

    # 1. first run case
    if len(chatbot) == 0:
        one_turn_chat[0] += "\n" + show_images
    # 2. not first run case
    else:
        previous_image = re.findall(r'<img src="./file=(.+?)"', chatbot[0][0])
        previous_video = re.findall(r'<video controls playsinline width="500" style="display: inline-block;"  src="./file=(.+?)"', chatbot[0][0])
        previous_audio = re.findall(r'<audio controls style="display: inline-block;" src="./file=(.+?)"', chatbot[0][0])
        if len(previous_image) > 0:
            previous_image = previous_image[0]
            # 2.1 new image append or pure text input will start a new conversation
            if image is not None and os.path.basename(previous_image) != os.path.basename(image):
                message.clear()
                one_turn_chat[0] += "\n" + show_images
        elif len(previous_video) > 0:
            previous_video = previous_video[0]
            # 2.2 new video append or pure text input will start a new conversation
            if video is not None and os.path.basename(previous_video) != os.path.basename(video):
                message.clear()
                one_turn_chat[0] += "\n" + show_images
        elif len(previous_audio) > 0:
            previous_audio = previous_audio[0]
            # 2.3 new audio append or pure text input will start a new conversation
            if audio is not None and os.path.basename(previous_audio) != os.path.basename(video):
                message.clear()
                one_turn_chat[0] += "\n" + show_images

    message.append({'role': 'user', 'content': textbox_in})

    if va_tag == "Vision Only":
        audio_tower = handler.model.model.audio_tower
        handler.model.model.audio_tower = None
    elif va_tag == "Audio Only":
        vision_tower = handler.model.model.vision_tower
        handler.model.model.vision_tower = None

    text_en_out = handler.generate(data, message, temperature=temperature, top_p=top_p, max_output_tokens=max_output_tokens)

    if va_tag == "Vision Only":
        handler.model.model.audio_tower = audio_tower
    elif va_tag == "Audio Only":
        handler.model.model.vision_tower = vision_tower

    message.append({'role': 'assistant', 'content': text_en_out})

    one_turn_chat[1] = text_en_out
    chatbot.append(one_turn_chat)

    return gr.update(value=video, interactive=True), gr.update(value=audio, interactive=True), message, chatbot


def regenerate(message, chatbot):
    message.pop(-1), message.pop(-1)
    chatbot.pop(-1)
    return message, chatbot


def clear_history(message, chatbot):
    message.clear(), chatbot.clear()
    return (gr.update(value=None, interactive=True),
            gr.update(value=None, interactive=True),
            gr.update(value=None, interactive=True),
            message, chatbot,
            gr.update(value=None, interactive=True))


# BUG of Zero Environment
# 1. The environment is fixed to torch>=2.0,<=2.2, gradio>=4.x.x
# 2. The operation or tensor which requires cuda are limited in those functions wrapped via spaces.GPU
# 3. The function can't return tensor or other cuda objects.

model_path = 'DAMO-NLP-SG/VideoLLaMA2.1-7B-AV'

handler = Chat(model_path, load_8bit=False, load_4bit=False)

textbox = gr.Textbox(show_label=False, placeholder="Enter text and press ENTER", container=False)

theme = gr.themes.Default(primary_hue=plum_color)
# theme.update_color("primary", plum_color.c500)
theme.set(slider_color="#9C276A")
theme.set(block_title_text_color="#9C276A")
theme.set(block_label_text_color="#9C276A")
theme.set(button_primary_text_color="#9C276A")
# theme.set(button_secondary_text_color="*neutral_800")


with gr.Blocks(title='VideoLLaMA 2 🔥🚀🔥', theme=theme, css=block_css) as demo:
    gr.Markdown(title_markdown)
    message = gr.State([])

    with gr.Row():
        with gr.Column(scale=3):
            video = gr.Video(label="Input Video")
            audio = gr.Audio(label="Input Audio", type="filepath")

            with gr.Accordion("Parameters", open=True) as parameter_row:
                # num_beams = gr.Slider(
                #     minimum=1,
                #     maximum=10,
                #     value=1,
                #     step=1,
                #     interactive=True,
                #     label="beam search numbers",
                # )

                va_tag = gr.Radio(choices=["Audio Vision", "Vision Only", "Audio Only"], value="Audio Vision", label="Select one")

                temperature = gr.Slider(
                    minimum=0.1,
                    maximum=1.0,
                    value=0.2,
                    step=0.1,
                    interactive=True,
                    label="Temperature",
                )

                top_p = gr.Slider(
                        minimum=0.0,
                        maximum=1.0,
                        value=0.7,
                        step=0.1,
                        interactive=True,
                        label="Top P",
                )

                max_output_tokens = gr.Slider(
                    minimum=64,
                    maximum=1024,
                    value=512,
                    step=64,
                    interactive=True,
                    label="Max output tokens",
                )

        with gr.Column(scale=7):
            chatbot = gr.Chatbot(label="VideoLLaMA 2", bubble_full_width=True, height=750)
            with gr.Row():
                with gr.Column(scale=8):
                    textbox.render()
                with gr.Column(scale=1, min_width=50):
                    submit_btn = gr.Button(value="Send", variant="primary", interactive=True)
            with gr.Row(elem_id="buttons") as button_row:
                upvote_btn     = gr.Button(value="👍  Upvote", interactive=True)
                downvote_btn   = gr.Button(value="👎  Downvote", interactive=True)
                # flag_btn     = gr.Button(value="⚠️  Flag", interactive=True)
                # stop_btn     = gr.Button(value="⏹️  Stop Generation", interactive=False)
                regenerate_btn = gr.Button(value="🔄  Regenerate", interactive=True)
                clear_btn      = gr.Button(value="🗑️  Clear history", interactive=True)

    with gr.Row():
        cur_dir = os.path.dirname(os.path.abspath(__file__))
        with gr.Column():
            gr.Examples(
                examples=[
                    [
                        f"{cur_dir}/examples/output_v_1jgsRbGzCls.mp4",
                        "What activity are the people practicing in the video?",
                    ],
                    [
                        f"{cur_dir}/examples/output_v_3V9tzjyr51I.mp4",
                        "What is the man doing in the video?",
                    ],
                ],
                inputs=[video, textbox],
            )
        with gr.Column():
            gr.Examples(
                examples=[
                    [
                        f"{cur_dir}/examples/00000368.mp4",
                        "Please describe the video with audio information.",
                    ],
                    [
                        f"{cur_dir}/examples/00003491.mp4",
                        "Where is the loudest instrument?",
                    ],
                ],
                inputs=[video, textbox],
            )
        with gr.Column():
            # audio
            gr.Examples(
                examples=[
                    [
                        f"{cur_dir}/examples/bird-twitter-car.wav",
                        "Please describe the audio.",
                    ],
                    [
                        f"{cur_dir}/examples/door.of.bar.raining2.wav",
                        "Please describe the audio.",
                    ],
                ],
                inputs=[audio, textbox],
            )

    gr.Markdown(tos_markdown)
    gr.Markdown(learn_more_markdown)

    submit_btn.click(
        generate, 
        [video, audio, message, chatbot, va_tag, textbox, temperature, top_p, max_output_tokens],
        [video, audio, message, chatbot])

    regenerate_btn.click(
        regenerate, 
        [message, chatbot], 
        [message, chatbot]).then(
        generate, 
        [video, audio, message, chatbot, va_tag, textbox, temperature, top_p, max_output_tokens], 
        [video, audio, message, chatbot])

    clear_btn.click(
        clear_history, 
        [message, chatbot],
        [video, audio, message, chatbot, textbox])

demo.launch(share=False)