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

# Load the model and tokenizer from Hugging Face
model_path = "Ozaii/W.AI-13B-Chat"  # Replace with your username and repository name
tokenizer = AutoTokenizer.from_pretrained(model_path)
model = AutoModelForCausalLM.from_pretrained(model_path)

device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
model.to(device)
model.eval()

@spaces.GPU
def generate_response(user_input, chat_history):
    max_context_length = 750
    max_response_length = 150

    prompt = ""
    for message in chat_history:
        if message[0] is not None:
            prompt += f"User: {message[0]}\n"
        if message[1] is not None:
            prompt += f"Assistant: {message[1]}\n"
    prompt += f"***Use natural conversation style of assistant, you can use +18 swear words and use irregular language similar to assistant.***User: {user_input}\nAssistant:"

    prompt_tokens = tokenizer.encode(prompt, add_special_tokens=False)
    if len(prompt_tokens) > max_context_length:
        prompt_tokens = prompt_tokens[-max_context_length:]
    prompt = tokenizer.decode(prompt_tokens, clean_up_tokenization_spaces=True)

    inputs = tokenizer(prompt, return_tensors="pt").to(device)
    with torch.no_grad():
        outputs = model.generate(
            inputs.input_ids,
            max_length=len(inputs.input_ids[0]) + max_response_length,  # Limit the maximum length for context and response
            min_length = 45,
            temperature=0.7,  # Slightly higher temperature for more diverse responses
            top_k=30,
            top_p=0.9,  # Allow a bit more randomness
            repetition_penalty=1.1,  # Mild repetition penalty
            no_repeat_ngram_size=3,  # Ensure no repeated phrases
            eos_token_id=tokenizer.eos_token_id,
            pad_token_id=tokenizer.eos_token_id
        )

    response = tokenizer.decode(outputs[0], skip_special_tokens=True)
    assistant_response = response.split("Assistant:")[-1].strip()
    assistant_response = assistant_response.split('\n')[0].strip()
    chat_history.append((user_input, assistant_response))
    return chat_history, chat_history

def restart_chat():
    return [], []

with gr.Blocks() as chat_interface:
    gr.Markdown("<h1><center>W.AI Chat Nikker xD</center></h1>")
    chat_history = gr.State([])
    with gr.Column():
        chatbox = gr.Chatbot()
        with gr.Row():
            user_input = gr.Textbox(show_label=False, placeholder="Summon Wali Here...")
            submit_button = gr.Button("Send")
            restart_button = gr.Button("Restart")

    submit_button.click(
        generate_response,
        inputs=[user_input, chat_history],
        outputs=[chatbox, chat_history]
    )

    restart_button.click(
        restart_chat,
        inputs=[],
        outputs=[chatbox, chat_history]
    )

chat_interface.launch()