import torch
import gradio as gr
from transformers import TextIteratorStreamer, AutoProcessor, LlavaForConditionalGeneration
from PIL import Image
from threading import Thread
import spaces
import accelerate
import time

DESCRIPTION = '''
<div>
<h1 style="text-align: center;">Krypton 🕋</h1>
<p>This uses an Open Source model from <a href="https://huggingface.co/xtuner/llava-llama-3-8b-v1_1-transformers"><b>xtuner/llava-llama-3-8b-v1_1-transformers</b></a></p>
</div>
'''

model_id = "xtuner/llava-llama-3-8b-v1_1-transformers"
model = LlavaForConditionalGeneration.from_pretrained(
    model_id,
    torch_dtype=torch.float16,
    low_cpu_mem_usage=True
)

model.to('cuda')

processor = AutoProcessor.from_pretrained(model_id)

# Confirming and setting the eos_token_id (if necessary)
model.generation_config.eos_token_id = processor.tokenizer.eos_token_id

@spaces.GPU
def bot_streaming(message, history):
    print(message)
    if message["files"]:
        # message["files"][-1] is a Dict or just a string
        if type(message["files"][-1]) == dict:
            image = message["files"][-1]["path"]
        else:
            image = message["files"][-1]
    else:
        # if there's no image uploaded for this turn, look for images in the past turns
        # kept inside tuples, take the last one
        for hist in history:
            if type(hist[0]) == tuple:
                image = hist[0][0]
    try:
        if image is None:
            # Handle the case where image is None
            gr.Error("You need to upload an image for LLaVA to work.")
    except NameError:
        # Handle the case where 'image' is not defined at all
        gr.Error("You need to upload an image for LLaVA to work.")

    prompt = f"<|start_header_id|>user<|end_header_id|>\n\n<image>\n{message['text']}<|eot_id|><|start_header_id|>assistant<|end_header_id|>\n\n"
    # print(f"prompt: {prompt}")
    image = Image.open(image)
    inputs = processor(prompt, image, return_tensors='pt').to(0, torch.float16)

    streamer = TextIteratorStreamer(processor, **{"skip_special_tokens": False, "skip_prompt": True})
    generation_kwargs = dict(inputs, streamer=streamer, max_new_tokens=1024, do_sample=False)

    thread = Thread(target=model.generate, kwargs=generation_kwargs)
    thread.start()

    text_prompt = f"<|start_header_id|>user<|end_header_id|>\n\n{message['text']}<|eot_id|><|start_header_id|>assistant<|end_header_id|>\n\n"
    # print(f"text_prompt: {text_prompt}")

    buffer = ""
    time.sleep(0.5)
    for new_text in streamer:
        # find <|eot_id|> and remove it from the new_text
        if "<|eot_id|>" in new_text:
            new_text = new_text.split("<|eot_id|>")[0]
        buffer += new_text

        # generated_text_without_prompt = buffer[len(text_prompt):]
        generated_text_without_prompt = buffer
        # print(generated_text_without_prompt)
        time.sleep(0.06)
        # print(f"new_text: {generated_text_without_prompt}")
        yield generated_text_without_prompt


chatbot = gr.Chatbot(height=600, label="Krypt AI")
chat_input = gr.MultimodalTextbox(interactive=True, file_types=["image"], placeholder="Enter your question or upload an image.", show_label=False)

with gr.Blocks(fill_height=True) as demo:
    gr.Markdown(DESCRIPTION)
    gr.ChatInterface(
        fn=krypton,
        chatbot=chatbot,
        fill_height=True,
        multimodal=True,
        textbox=chat_input,
    )

demo.queue(api_open=False)
demo.launch(show_api=False, share=False)