import os
import gradio as gr
import mdtex2html
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer
from transformers.generation import GenerationConfig

# Initialize model and tokenizer
tokenizer = AutoTokenizer.from_pretrained("Qwen/Qwen-7B-Chat", trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained("Qwen/Qwen-7B-Chat", device_map="auto", trust_remote_code=True).eval()
model.generation_config = GenerationConfig.from_pretrained("Qwen/Qwen-7B-Chat", trust_remote_code=True)

# Postprocess function
def postprocess(self, y):
    if y is None:
        return []
    for i, (message, response) in enumerate(y):
        y[i] = (
            None if message is None else mdtex2html.convert(message),
            None if response is None else mdtex2html.convert(response),
        )
    return y

gr.Chatbot.postprocess = postprocess

# Text parsing function
def _parse_text(text):
    lines = text.split("\n")
    lines = [line for line in lines if line != ""]
    count = 0
    for i, line in enumerate(lines):
        if "```" in line:
            count += 1
            items = line.split("`")
            if count % 2 == 1:
                lines[i] = f'<pre><code class="language-{items[-1]}">'
            else:
                lines[i] = f"<br></code></pre>"
        else:
            if i > 0:
                if count % 2 == 1:
                    line = line.replace("`", r"\`")
                    line = line.replace("<", "&lt;")
                    line = line.replace(">", "&gt;")
                    line = line.replace(" ", "&nbsp;")
                    line = line.replace("*", "&ast;")
                    line = line.replace("_", "&lowbar;")
                    line = line.replace("-", "&#45;")
                    line = line.replace(".", "&#46;")
                    line = line.replace("!", "&#33;")
                    line = line.replace("(", "&#40;")
                    line = line.replace(")", "&#41;")
                    line = line.replace("$", "&#36;")
                lines[i] = "<br>" + line
    text = "".join(lines)
    return text

# Demo launching function
def _launch_demo(args, model, tokenizer, config):
    def predict(_query, _chatbot, _task_history):
        print(f"User: {_parse_text(_query)}")
        _chatbot.append((_parse_text(_query), ""))
        full_response = ""

        for response in model.chat_stream(tokenizer, _query, history=_task_history, generation_config=config):
            _chatbot[-1] = (_parse_text(_query), _parse_text(response))

            yield _chatbot
            full_response = _parse_text(response)

        print(f"History: {_task_history}")
        _task_history.append((_query, full_response))
        print(f"Qwen-Chat: {_parse_text(full_response)}")

    def regenerate(_chatbot, _task_history):
        if not _task_history:
            yield _chatbot
            return
        item = _task_history.pop(-1)
        _chatbot.pop(-1)
        yield from predict(item[0], _chatbot, _task_history)

    def reset_user_input():
        return gr.update(value="")

    def reset_state(_chatbot, _task_history):
        _task_history.clear()
        _chatbot.clear()
        import gc
        gc.collect()
        torch.cuda.empty_cache()
        return _chatbot

    with gr.Blocks() as demo:
        gr.Markdown("""
    ## Qwen-14B-Chat: A Large Language Model by Alibaba Cloud
    **Space created by [@artificialguybr](https://twitter.com/artificialguybr) based on QWEN Code. Thanks HF for GPU!**

    ### Performance Metrics:
    - **MMLU Accuracy**: 
      - 0-shot: 64.6
      - 5-shot: 66.5
    - **HumanEval Pass@1**: 43.9
    - **GSM8K Accuracy**: 
      - 0-shot: 60.1
      - 8-shot: 59.3
    """)
        chatbot = gr.Chatbot(label='Qwen-Chat', elem_classes="control-height", queue=True)
        query = gr.Textbox(lines=2, label='Input')
        task_history = gr.State([])

        with gr.Row():
            empty_btn = gr.Button("🧹 Clear History")
            submit_btn = gr.Button("🚀 Submit")
            regen_btn = gr.Button("🤔️ Regenerate")

        submit_btn.click(predict, [query, chatbot, task_history], [chatbot], show_progress=True, queue=True)  # Enable queue
        submit_btn.click(reset_user_input, [], [query])
        empty_btn.click(reset_state, [chatbot, task_history], outputs=[chatbot], show_progress=True)
        regen_btn.click(regenerate, [chatbot, task_history], [chatbot], show_progress=True, queue=True)  # Enable queue
    demo.queue(max_size=20)
    demo.launch(share=True)


# Main execution
if __name__ == "__main__":
    _launch_demo(None, model, tokenizer, model.generation_config)