import sys
import os
import argparse
import time
import subprocess
import spaces
import cumo.serve.gradio_web_server as gws

import datetime
import json

import gradio as gr
import requests
from PIL import Image

from cumo.conversation import (default_conversation, conv_templates, SeparatorStyle)
from cumo.constants import LOGDIR
from cumo.utils import (build_logger, server_error_msg, violates_moderation, moderation_msg)
import hashlib

import torch
import io
from cumo.constants import WORKER_HEART_BEAT_INTERVAL
from cumo.utils import (build_logger, server_error_msg,
    pretty_print_semaphore)
from cumo.model.builder import load_pretrained_model
from cumo.mm_utils import process_images, load_image_from_base64, tokenizer_image_token
from cumo.constants import IMAGE_TOKEN_INDEX, DEFAULT_IMAGE_TOKEN, DEFAULT_IM_START_TOKEN, DEFAULT_IM_END_TOKEN
from transformers import TextIteratorStreamer
from threading import Thread

# Execute the pip install command with additional options
#subprocess.check_call([sys.executable, '-m', 'pip', 'install', 'flash-attn', '--no-build-isolation', '-U']

headers = {"User-Agent": "CuMo"}

no_change_btn = gr.Button()
enable_btn = gr.Button(interactive=True)
disable_btn = gr.Button(interactive=False)

device = "cuda" if torch.cuda.is_available() else "cpu"
model_path = './checkpoints/CuMo-mistral-7b'
model_base = 'mistralai/Mistral-7B-Instruct-v0.2'
model_name = 'CuMo-mistral-7b'
conv_mode = 'mistral_instruct_system'
load_8bit = False
load_4bit = False
tokenizer, model, image_processor, context_len = load_pretrained_model(model_path, model_base, model_name, load_8bit, load_4bit, device=device, use_flash_attn=False)
model.config.training = False
             
def upvote_last_response(state):
    return ("",) + (disable_btn,) * 3


def downvote_last_response(state):
    return ("",) + (disable_btn,) * 3


def flag_last_response(state):
    return ("",) + (disable_btn,) * 3

def clear_history():
    state = default_conversation.copy()
    return (state, state.to_gradio_chatbot(), "", None) + (disable_btn,) * 5

def add_text(state, imagebox, textbox, image_process_mode):
    if state is None:
        state = conv_templates[conv_mode].copy()

    if imagebox is not None:
        textbox = DEFAULT_IMAGE_TOKEN + '\n' + textbox
        image = Image.open(imagebox).convert('RGB')

    if imagebox is not None:
        textbox = (textbox, image, image_process_mode)

    state.append_message(state.roles[0], textbox)
    state.append_message(state.roles[1], None)

    yield (state, state.to_gradio_chatbot(), "", None) + (disable_btn, disable_btn, disable_btn, enable_btn, enable_btn)

def delete_text(state, image_process_mode):
    state.messages[-1][-1] = None
    prev_human_msg = state.messages[-2]
    if type(prev_human_msg[1]) in (tuple, list):
        prev_human_msg[1] = (*prev_human_msg[1][:2], image_process_mode)
    yield (state, state.to_gradio_chatbot(), "", None) + (disable_btn, disable_btn, disable_btn, enable_btn, enable_btn)

def regenerate(state, image_process_mode):
    state.messages[-1][-1] = None
    prev_human_msg = state.messages[-2]
    if type(prev_human_msg[1]) in (tuple, list):
        prev_human_msg[1] = (*prev_human_msg[1][:2], image_process_mode)
    state.skip_next = False
    return (state, state.to_gradio_chatbot(), "", None) + (disable_btn,) * 5

@spaces.GPU
def generate(state, imagebox, textbox, image_process_mode, temperature, top_p, max_output_tokens):
    prompt = state.get_prompt()
    images = state.get_images(return_pil=True)
    #prompt, image_args = process_image(prompt, images)

    ori_prompt = prompt
    num_image_tokens = 0

    if images is not None and len(images) > 0:
        if len(images) > 0:
            if len(images) != prompt.count(DEFAULT_IMAGE_TOKEN):
                raise ValueError("Number of images does not match number of <image> tokens in prompt")
            
            #images = [load_image_from_base64(image) for image in images]
            image_sizes = [image.size for image in images]
            images = process_images(images, image_processor, model.config)

            if type(images) is list:
                images = [image.to(model.device, dtype=torch.float16) for image in images]
            else:
                images = images.to(model.device, dtype=torch.float16)

            replace_token = DEFAULT_IMAGE_TOKEN
            if getattr(model.config, 'mm_use_im_start_end', False):
                replace_token = DEFAULT_IM_START_TOKEN + replace_token + DEFAULT_IM_END_TOKEN
            prompt = prompt.replace(DEFAULT_IMAGE_TOKEN, replace_token)

            num_image_tokens = prompt.count(replace_token) * model.get_vision_tower().num_patches
        else:
            images = None
            image_sizes = None
        image_args = {"images": images, "image_sizes": image_sizes}
    else:
        images = None
        image_args = {}

    max_context_length = getattr(model.config, 'max_position_embeddings', 2048)
    max_new_tokens = 512
    do_sample = True if temperature > 0.001 else False
    stop_str = state.sep if state.sep_style in [SeparatorStyle.SINGLE, SeparatorStyle.MPT] else state.sep2

    input_ids = tokenizer_image_token(prompt, tokenizer, IMAGE_TOKEN_INDEX, return_tensors='pt').unsqueeze(0).to(model.device)
    streamer = TextIteratorStreamer(tokenizer, skip_prompt=True, skip_special_tokens=True, timeout=15)

    max_new_tokens = min(max_new_tokens, max_context_length - input_ids.shape[-1] - num_image_tokens)

    if max_new_tokens < 1:
        yield json.dumps({"text": ori_prompt + "Exceeds max token length. Please start a new conversation, thanks.", "error_code": 0}).encode() + b"\0"
        return

    thread = Thread(target=model.generate, kwargs=dict(
        inputs=input_ids,
        do_sample=do_sample,
        temperature=temperature,
        top_p=top_p,
        max_new_tokens=max_new_tokens,
        streamer=streamer,
        use_cache=True,
        pad_token_id=tokenizer.eos_token_id,
        **image_args
    ))
    thread.start()
    generated_text = ''
    for new_text in streamer:
        generated_text += new_text
        if generated_text.endswith(stop_str):
            generated_text = generated_text[:-len(stop_str)]
        state.messages[-1][-1] = generated_text
        yield (state, state.to_gradio_chatbot(), "", None) + (disable_btn, disable_btn, disable_btn, enable_btn, enable_btn)
    
    yield (state, state.to_gradio_chatbot(), "", None) + (enable_btn,) * 5
    
    torch.cuda.empty_cache()

title_markdown = ("""
# CuMo: Scaling Multimodal LLM with Co-Upcycled Mixture-of-Experts
[[Project Page](https://chrisjuniorli.github.io/project/CuMo/)] [[Code](https://github.com/SHI-Labs/CuMo)] [[Model](https://huggingface.co/shi-labs/CuMo-mistral-7b)] | 📚 [[Arxiv](https://arxiv.org/pdf/2405.05949)]]
""")

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
The service is a research preview intended for non-commercial use only, subject to the. Please contact us if you find any potential violation.
""")

block_css = """

#buttons button {
    min-width: min(120px,100%);
}

"""

textbox = gr.Textbox(show_label=False, placeholder="Enter text and press ENTER", container=False)
with gr.Blocks(title="CuMo", theme=gr.themes.Default(), css=block_css) as demo:
    state = gr.State()

    gr.Markdown(title_markdown)

    with gr.Row():
        with gr.Column(scale=3):
            imagebox = gr.Image(label="Input Image", type="filepath")
            image_process_mode = gr.Radio(
                ["Crop", "Resize", "Pad", "Default"],
                value="Default",
                label="Preprocess for non-square image", visible=False)

    
            #cur_dir = os.path.dirname(os.path.abspath(__file__))
            cur_dir = './cumo/serve'
            gr.Examples(examples=[
                [f"{cur_dir}/examples/aveger.jpg", "Can you introduce this movie based on the poster?"],
                [f"{cur_dir}/examples/fridge.webp", "Can you describe what groceries are presented in this fridge?"],
                [f"{cur_dir}/examples/su7_4.jpg", "What car is it in this image?"],
                [f"{cur_dir}/examples/nvidia.jpeg", "Can you tell me what happened in this image?"],
                [f"{cur_dir}/examples/animal.webp", "What animals are in this image?"],
                [f"{cur_dir}/examples/disney.jpeg", "How many characters in this image?"],
                [f"{cur_dir}/examples/reka_6.jpeg", "What colour is my hat (im sitting on the bear)?"],
            ], inputs=[imagebox, textbox], cache_examples=False)

            with gr.Accordion("Parameters", open=False) as parameter_row:
                temperature = gr.Slider(minimum=0.0, 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=0, maximum=1024, value=512, step=64, interactive=True, label="Max output tokens",)

        with gr.Column(scale=8):
            chatbot = gr.Chatbot(
                elem_id="chatbot",
                label="CuMo Chatbot",
                height=650,
                layout="panel",
            )
            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")
            with gr.Row(elem_id="buttons") as button_row:
                upvote_btn = gr.Button(value="👍  Upvote", interactive=False)
                downvote_btn = gr.Button(value="👎  Downvote", interactive=False)
                flag_btn = gr.Button(value="⚠️  Flag", interactive=False)
                #stop_btn = gr.Button(value="⏹️  Stop Generation", interactive=False)
                regenerate_btn = gr.Button(value="🔄  Regenerate", interactive=False)
                clear_btn = gr.Button(value="🗑️  Clear", interactive=False)

    gr.Markdown(tos_markdown)
    gr.Markdown(learn_more_markdown)
    url_params = gr.JSON(visible=False)

    # Register listeners
    btn_list = [upvote_btn, downvote_btn, flag_btn, regenerate_btn, clear_btn]
    upvote_btn.click(
        upvote_last_response,
        [state],
        [textbox, upvote_btn, downvote_btn, flag_btn]
    )
    downvote_btn.click(
        downvote_last_response,
        [state],
        [textbox, upvote_btn, downvote_btn, flag_btn]
    )
    flag_btn.click(
        flag_last_response,
        [state],
        [textbox, upvote_btn, downvote_btn, flag_btn]
    )

    clear_btn.click(
        clear_history,
        None,
        [state, chatbot, textbox, imagebox] + btn_list,
        queue=False
    )

    regenerate_btn.click(
        delete_text,
        [state, image_process_mode],
        [state, chatbot, textbox, imagebox] + btn_list,
    ).then(
        generate,
        [state, imagebox, textbox, image_process_mode, temperature, top_p, max_output_tokens],
        [state, chatbot, textbox, imagebox] + btn_list,
    )
    textbox.submit(
        add_text,
        [state, imagebox, textbox, image_process_mode],
        [state, chatbot, textbox, imagebox] + btn_list,
    ).then(
        generate,
        [state, imagebox, textbox, image_process_mode, temperature, top_p, max_output_tokens],
        [state, chatbot, textbox, imagebox] + btn_list,
    )

    submit_btn.click(
        add_text,
        [state, imagebox, textbox, image_process_mode],
        [state, chatbot, textbox, imagebox] + btn_list,
    ).then(
        generate,
        [state, imagebox, textbox, image_process_mode, temperature, top_p, max_output_tokens],
        [state, chatbot, textbox, imagebox] + btn_list,
    )

demo.queue(
    status_update_rate=10,
    api_open=False
).launch()