import gradio as gr
import spaces
import os
import time
from PIL import Image
import functools
from models.mllava import MLlavaProcessor, LlavaForConditionalGeneration, chat_mllava_stream, MLlavaForConditionalGeneration, chat_mllava
from models.conversation import conv_templates
from typing import List
processor = MLlavaProcessor.from_pretrained("remyxai/SpaceMantis")
model = LlavaForConditionalGeneration.from_pretrained("remyxai/SpaceMantis")
conv_template = conv_templates['llama_3']

@spaces.GPU
def generate_stream(text:str, images:List[Image.Image], history: List[dict], **kwargs):
    global processor, model
    model = model.to("cuda")
    if not images:
        images = None
    for text, history in chat_mllava_stream(text, images, model, processor, history=history, **kwargs):
        yield text

    return text

@spaces.GPU
def generate(text:str, images:List[Image.Image], history: List[dict], **kwargs):
    global processor, model
    model = model.to("cuda")
    if not images:
        images = None
    generated_text, history = chat_mllava(text, images, model, processor, history=history, **kwargs)
    return generated_text

def enable_next_image(uploaded_images, image):
    uploaded_images.append(image)
    return uploaded_images, gr.MultimodalTextbox(value=None, interactive=False)

def add_message(history, message):
    if message["files"]:
        for file in message["files"]:
            history.append([(file,), None])
    if message["text"]:
        history.append([message["text"], None])
    return history, gr.MultimodalTextbox(value=None)

def print_like_dislike(x: gr.LikeData):
    print(x.index, x.value, x.liked)


def get_chat_history(history):
    chat_history = []
    user_role = conv_template.roles[0]
    assistant_role = conv_template.roles[1]
    for i, message in enumerate(history):
        if isinstance(message[0], str):
            chat_history.append({"role": user_role, "text": message[0]})
            if i != len(history) - 1:
                assert message[1], "The bot message is not provided, internal error"
                chat_history.append({"role": assistant_role, "text": message[1]})
            else:
                assert not message[1], "the bot message internal error, get: {}".format(message[1])
                chat_history.append({"role": assistant_role, "text": ""})
    return chat_history


def get_chat_images(history):
    images = []
    for message in history:
        if isinstance(message[0], tuple):
            images.extend(message[0])
    return images


def bot(history):
    print(history)
    cur_messages = {"text": "", "images": []}
    for message in history[::-1]:
        if message[1]:
            break
        if isinstance(message[0], str):
            cur_messages["text"] = message[0] + " " + cur_messages["text"]
        elif isinstance(message[0], tuple):
            cur_messages["images"].extend(message[0])
    cur_messages["text"] = cur_messages["text"].strip()
    cur_messages["images"] = cur_messages["images"][::-1]
    if not cur_messages["text"]:
        raise gr.Error("Please enter a message")
    if cur_messages['text'].count("<image>") < len(cur_messages['images']):
        gr.Warning("The number of images uploaded is more than the number of <image> placeholders in the text. Will automatically prepend <image> to the text.")
        cur_messages['text'] = "<image> "* (len(cur_messages['images']) - cur_messages['text'].count("<image>")) + cur_messages['text']
        history[-1][0] = cur_messages["text"]
    if cur_messages['text'].count("<image>") > len(cur_messages['images']):
        gr.Warning("The number of images uploaded is less than the number of <image> placeholders in the text. Will automatically remove extra <image> placeholders from the text.")
        cur_messages['text'] = cur_messages['text'][::-1].replace("<image>"[::-1], "", cur_messages['text'].count("<image>") - len(cur_messages['images']))[::-1]
        history[-1][0] = cur_messages["text"]
        
    
    
    chat_history = get_chat_history(history)
    chat_images = get_chat_images(history)
    
    generation_kwargs = {
        "max_new_tokens": 4096,
        "num_beams": 1,
        "do_sample": False
    }
    
    response = generate_stream(None, chat_images, chat_history, **generation_kwargs) 
    for _output in response:
        history[-1][1] = _output
        time.sleep(0.05)
        yield history


        
def build_demo():
    with gr.Blocks() as demo:
        
        gr.Markdown(""" # SpaceMantis
Mantis is a multimodal conversational AI model fine-tuned from [Mantis-8B-siglip-llama3](https://huggingface.co/remyxai/SpaceMantis/blob/main/TIGER-Lab/Mantis-8B-siglip-llama3) for enhanced spatial reasoning. It's optimized for multi-image reasoning, where inverleaved text and images can be used to generate responses.

### [Github](https://github.com/remyxai/VQASynth) | [Model](https://huggingface.co/remyxai/SpaceMantis) | [Dataset](https://huggingface.co/datasets/remyxai/mantis-spacellava)        
        """)
        
        gr.Markdown("""## Chat with SpaceMantis
        SpaceMantis supports interleaved text-image input format, where you can simply use the placeholder `<image>` to indicate the position of uploaded images.
        The model is optimized for multi-image reasoning, while preserving the ability to chat about text and images in a single conversation.
        (The model currently serving is [🤗 remyxai/SpaceMantis](https://huggingface.co/remyxai/SpaceMantis))
        """)
        
        chatbot = gr.Chatbot(line_breaks=True)
        chat_input = gr.MultimodalTextbox(interactive=True, file_types=["image"], placeholder="Enter message or upload images. Please use <image> to indicate the position of uploaded images", show_label=True)
        
        chat_msg = chat_input.submit(add_message, [chatbot, chat_input], [chatbot, chat_input])
        
        """
        with gr.Accordion(label='Advanced options', open=False):
            temperature = gr.Slider(
                label='Temperature',
                minimum=0.1,
                maximum=2.0,
                step=0.1,
                value=0.2,
                interactive=True
            )
            top_p = gr.Slider(
                label='Top-p',
                minimum=0.05,
                maximum=1.0,
                step=0.05,
                value=1.0,
                interactive=True
            )
        """

        bot_msg = chat_msg.success(bot, chatbot, chatbot, api_name="bot_response")
        
        chatbot.like(print_like_dislike, None, None)

        with gr.Row():
            send_button = gr.Button("Send")
            clear_button = gr.ClearButton([chatbot, chat_input])

        send_button.click(
            add_message, [chatbot, chat_input], [chatbot, chat_input]
        ).then(
            bot, chatbot, chatbot, api_name="bot_response"
        )
        
        gr.Examples(
            examples=[
                {
                    "text": "Give me the height of the man in the red hat in feet.", 
                    "files": ["./examples/warehouse_rgb.jpg"]
                },
            ],
            inputs=[chat_input],
        )        
        
        gr.Markdown("""
## Citation
```
@article{chen2024spatialvlm,
  title = {SpatialVLM: Endowing Vision-Language Models with Spatial Reasoning Capabilities},
  author = {Chen, Boyuan and Xu, Zhuo and Kirmani, Sean and Ichter, Brian and Driess, Danny and Florence, Pete and Sadigh, Dorsa and Guibas, Leonidas and Xia, Fei},
  journal = {arXiv preprint arXiv:2401.12168},
  year = {2024},
  url = {https://arxiv.org/abs/2401.12168},
}

@article{jiang2024mantis,
  title={MANTIS: Interleaved Multi-Image Instruction Tuning},
  author={Jiang, Dongfu and He, Xuan and Zeng, Huaye and Wei, Con and Ku, Max and Liu, Qian and Chen, Wenhu},
  journal={arXiv preprint arXiv:2405.01483},
  year={2024}
}
```""")
    return demo    
    

if __name__ == "__main__":
    demo = build_demo()
    demo.launch()