import spaces
from transformers import AutoTokenizer, AutoModelForCausalLM
import torch
import os
import gradio as gr
import sentencepiece


os.environ['PYTORCH_CUDA_ALLOC_CONF'] = 'max_split_size_mb:120'
model_id = "thesven/Llama3-8B-SFT-code_bagel-bnb-4bit"
tokenizer_path = "./"

DESCRIPTION = """
# thesven/Llama3-8B-SFT-code_bagel-bnb-4bit
"""

tokenizer = AutoTokenizer.from_pretrained(model_id, device_map="auto", trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(model_id, device_map="cuda", torch_dtype=torch.bfloat16, trust_remote_code=True)

def format_prompt(user_message, system_message="You are an expert developer in all programming languages.  Help me with my code. Answer any questions I have with code examples."):
    prompt = f"<|im_start|>assistant\n{system_message}<|im_end|>\n<|im_start|>\nuser\n{user_message}<|im_end|>\nassistant\n"
    return prompt

@spaces.GPU
def predict(message, system_message, max_new_tokens=600, temperature=3.5, top_p=0.9, top_k=40, do_sample=False):
    formatted_prompt = format_prompt(message, system_message)

    input_ids = tokenizer.encode(formatted_prompt, return_tensors='pt')
    input_ids = input_ids.to(model.device)

    response_ids = model.generate(
        input_ids,
        max_length=max_new_tokens + input_ids.shape[1],
        temperature=temperature,  
        top_p=top_p,              
        top_k=top_k,              
        no_repeat_ngram_size=9,
        pad_token_id=tokenizer.eos_token_id,
        do_sample=do_sample
    )

    response = tokenizer.decode(response_ids[:, input_ids.shape[-1]:][0], skip_special_tokens=True)
    truncate_str = "<|im_end|>"
    if truncate_str and truncate_str in response:
        response = response.split(truncate_str)[0]

    return [("bot", response)]    
    
with gr.Blocks() as demo:
    gr.Markdown(DESCRIPTION)
    with gr.Group():
        system_prompt = gr.Textbox(placeholder='Provide a System Prompt In The First Person', label='System Prompt', lines=2, value="You are an expert developer in all programming languages.  Help me with my code. Answer any questions I have with code examples.")

    with gr.Group():
        chatbot = gr.Chatbot(label='thesven/Llama3-8B-SFT-code_bagel-bnb-4bit')

    with gr.Group():
        textbox = gr.Textbox(placeholder='Your Message Here', label='Your Message', lines=2)
        submit_button = gr.Button('Submit', variant='primary')

    with gr.Accordion(label='Advanced options', open=False):
        max_new_tokens = gr.Slider(label='Max New Tokens', minimum=1, maximum=55000, step=1, value=512)
        temperature = gr.Slider(label='Temperature', minimum=0.1, maximum=4.0, step=0.1, value=0.1)
        top_p = gr.Slider(label='Top-P (nucleus sampling)', minimum=0.05, maximum=1.0, step=0.05, value=0.9)
        top_k = gr.Slider(label='Top-K', minimum=1, maximum=1000, step=1, value=40)
        do_sample_checkbox = gr.Checkbox(label='Disable for faster inference', value=True)

    submit_button.click(
        fn=predict,
        inputs=[textbox, system_prompt, max_new_tokens, temperature, top_p, top_k, do_sample_checkbox],
        outputs=chatbot
    )

demo.launch()