from peft import AutoPeftModelForCausalLM
from transformers import AutoTokenizer, TextStreamer
import gradio as gr
"""
For more information on `huggingface_hub` Inference API support, please check the docs: https://huggingface.co/docs/huggingface_hub/v0.22.2/en/guides/inference
"""
# client = InferenceClient("EITD/lora_model", token=os.getenv("HF_TOKEN"))

class CustomTextStreamer(TextStreamer):
    def __init__(self, tokenizer):
        super().__init__(tokenizer)
        self.generated_text = ""

    def on_token(self, token):
        super().on_token(token)
        self.generated_text += token

model = AutoPeftModelForCausalLM.from_pretrained(
        "EITD/lora_model_1", # YOUR MODEL YOU USED FOR TRAINING
        load_in_4bit = False,
    )
tokenizer = AutoTokenizer.from_pretrained("EITD/lora_model_1")

# messages = [{"role": "user", "content": "Continue the Fibonacci sequence: 1, 1, 2, 3, 5, 8,"},]

# inputs = tokenizer.apply_chat_template(
#     messages,
#     tokenize = True,
#     add_generation_prompt = True, # Must add for generation
#     return_tensors = "pt",
# )

# outputs = model.generate(input_ids = inputs, max_new_tokens = 64, use_cache = True,
#                         temperature = 1.5, min_p = 0.1)

# print(tokenizer.batch_decode(outputs))

def respond(
    message,
    history: list[tuple[str, str]],
    system_message,
    max_tokens,
    temperature,
    top_p,
):
    messages = [{"role": "system", "content": system_message}]

    for val in history:
        if val[0]:
            messages.append({"role": "user", "content": val[0]})
        if val[1]:
            messages.append({"role": "assistant", "content": val[1]})

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

    response = ""

    # for message in client.chat_completion(
    #     messages,
    #     max_tokens=max_tokens,
    #     stream=True,
    #     temperature=temperature,
    #     top_p=top_p,
    # ):
    #     token = message.choices[0].delta.content

    #     response += token
    #     yield response
    
    inputs = tokenizer.apply_chat_template(
        messages,
        tokenize = True,
        add_generation_prompt = True, # Must add for generation
        return_tensors = "pt",
    )
    
    custom_streamer = CustomTextStreamer(tokenizer)
    model.generate(input_ids = inputs, streamer = custom_streamer, max_new_tokens = max_tokens,
                    use_cache = True, temperature = temperature, min_p = top_p)
    
    for token in custom_streamer.generated_text:
        response += token
        yield response


"""
For information on how to customize the ChatInterface, peruse the gradio docs: https://www.gradio.app/docs/chatinterface
"""
demo = gr.ChatInterface(
    respond,
    additional_inputs=[
        gr.Textbox(value="You are a friendly Chatbot.", label="System message"),
        gr.Slider(minimum=1, maximum=2048, value=512, step=1, label="Max new tokens"),
        gr.Slider(minimum=0.1, maximum=4.0, value=0.7, step=0.1, label="Temperature"),
        gr.Slider(
            minimum=0.1,
            maximum=1.0,
            value=0.95,
            step=0.05,
            label="Top-p (nucleus sampling)",
        ),
    ],
)


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