import os
import time
import spaces
import torch
from transformers import AutoModelForCausalLM, AutoTokenizer, TextIteratorStreamer
import gradio as gr
from threading import Thread

MODEL_LIST = ["mistralai/Mistral-Nemo-Instruct-2407"]
HF_TOKEN = os.environ.get("HF_TOKEN", None)
MODEL = os.environ.get("MODEL_ID")

TITLE = "<h1><center>Mistral NeMo 12B</center></h1>"

PLACEHOLDER = """
<center>
<p>Hi, I'm NeMo. Ask me anything.</p>
</center>
"""


CSS = """
.duplicate-button {
    margin: auto !important;
    color: white !important;
    background: black !important;
    border-radius: 100vh !important;
}
h3 {
    text-align: center;
}
"""

device = "cuda" # for GPU usage or "cpu" for CPU usage

tokenizer = AutoTokenizer.from_pretrained(MODEL)
model = AutoModelForCausalLM.from_pretrained(
    MODEL,
    torch_dtype=torch.bfloat16,
    device_map="auto",
    ignore_mismatched_sizes=True)

@spaces.GPU()
def stream_chat(
    message: str, 
    history: list, 
    temperature: float = 0.3, 
    max_new_tokens: int = 1024, 
    top_p: float = 1.0, 
    top_k: int = 20, 
    penalty: float = 1.2,
):
    print(f'message: {message}')
    print(f'history: {history}')

    conversation = []
    for prompt, answer in history:
        conversation.extend([
            {"role": "user", "content": prompt}, 
            {"role": "assistant", "content": answer},
        ])

    conversation.append({"role": "user", "content": message})

    input_text=tokenizer.apply_chat_template(conversation, tokenize=False)
    inputs = tokenizer.encode(input_text, return_tensors="pt").to(device)
    streamer = TextIteratorStreamer(tokenizer, timeout=60.0, skip_prompt=True, skip_special_tokens=True)
    
    generate_kwargs = dict(
        input_ids=inputs, 
        max_new_tokens = max_new_tokens,
        do_sample = False if temperature == 0 else True,
        top_p = top_p,
        top_k = top_k,
        temperature = temperature,
        streamer=streamer,
    )

    with torch.no_grad():
        thread = Thread(target=model.generate, kwargs=generate_kwargs)
        thread.start()
        
    buffer = ""
    for new_text in streamer:
        buffer += new_text
        yield buffer

            
chatbot = gr.Chatbot(height=600, placeholder=PLACEHOLDER)

with gr.Blocks(css=CSS, theme="Nymbo/Nymbo_Theme") as demo:
    gr.HTML(TITLE)
    gr.ChatInterface(
        fn=stream_chat,
        chatbot=chatbot,
        fill_height=True,
        additional_inputs_accordion=gr.Accordion(label="⚙️ Parameters", open=False, render=False),
        additional_inputs=[
            gr.Slider(
                minimum=0,
                maximum=1,
                step=0.1,
                value=0.3,
                label="Temperature",
                render=False,
            ),
            gr.Slider(
                minimum=128,
                maximum=8192,
                step=1,
                value=1024,
                label="Max new tokens",
                render=False,
            ),
            gr.Slider(
                minimum=0.0,
                maximum=1.0,
                step=0.1,
                value=1.0,
                label="top_p",
                render=False,
            ),
            gr.Slider(
                minimum=1,
                maximum=20,
                step=1,
                value=20,
                label="top_k",
                render=False,
            ),
            gr.Slider(
                minimum=0.0,
                maximum=2.0,
                step=0.1,
                value=1.2,
                label="Repetition penalty",
                render=False,
            ),
        ],
        examples=[
            ["Help me study vocabulary: write a sentence for me to fill in the blank, and I'll try to pick the correct option."],
            ["What are 5 creative things I could do with my kids' art? I don't want to throw them away, but it's also so much clutter."],
            ["Tell me a random fun fact about the Roman Empire."],
            ["Show me a code snippet of a website's sticky header in CSS and JavaScript."],
        ],
        cache_examples=False,
    )
    
    with gr.Accordion("Model Information", open=False):
        gr.Markdown(
            """
            # Key Features
            - **SOTA** Performance
            - **12B** Parameters
            - **128K** Context Window
            - Trained on large portion of **multilingual** and **code** data
            - Apache 2 License
            
            # Main Benchmarks
            | Benchmark                 | Score |
            | ------------------------- | ----- |
            | HellaSwag (0-shot)        | 83.5% |
            | Winogrande (0-shot)       | 76.8% |
            | OpenBookQA (0-shot)       | 60.6% |
            | CommonSenseQA (0-shot)    | 70.4% |
            | TruthfulQA (0-shot)       | 50.3% |
            | MMLU (5-shot)             | 68.0% |
            | TriviaQA (5-shot)         | 73.8% |
            | NaturalQuestions (5-shot) | 31.2% |
            
            # Multilingual Benchmarks
            | Language   | Score |
            | ---------- | ----- |
            | French     | 62.3% |
            | German     | 62.7% |
            | Spanish    | 64.6% |
            | Italian    | 61.3% |
            | Portuguese | 63.3% |
            | Russian    | 59.2% |
            | Chinese    | 59.0% |
            | Japanese   | 59.0% |
            """
        )

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