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import json
import os
import gradio as gr
from transformers import AutoModelForCausalLM, AutoTokenizer
import torch

# --- Config ---
MODEL_NAME = "DSDUDEd/Cass-Beta1.3"  # or "DSDUDEd/Dave"
MEMORY_FILE = "cass_memory.json"
MAX_MEMORY = 50  # max number of message pairs to keep

# --- Load model and tokenizer ---
print("Loading model...")
tokenizer = AutoTokenizer.from_pretrained(MODEL_NAME)
model = AutoModelForCausalLM.from_pretrained(MODEL_NAME)
device = "cuda" if torch.cuda.is_available() else "cpu"
model.to(device)

# --- Load memory ---
if os.path.exists(MEMORY_FILE):
    with open(MEMORY_FILE, "r") as f:
        memory = json.load(f)
else:
    memory = []

def save_memory():
    with open(MEMORY_FILE, "w") as f:
        json.dump(memory[-MAX_MEMORY:], f, indent=2)

# --- Chat function ---
def chat_with_ai(user_input):
    # Build context from memory
    context = " ".join([f"User: {u} AI: {c}" for u, c in memory])
    input_text = context + f" User: {user_input} AI:"

    inputs = tokenizer(input_text, return_tensors="pt").to(device)
    
    outputs = model.generate(
        **inputs,
        max_length=150,
        do_sample=True,
        temperature=0.8,
        top_p=0.9,
        pad_token_id=tokenizer.eos_token_id
    )

    reply = tokenizer.decode(outputs[0], skip_special_tokens=True)
    new_reply = reply.split("AI:")[-1].strip()

    # Add to memory and save
    memory.append((user_input, new_reply))
    save_memory()

    return memory, memory

# --- Gradio Interface ---
with gr.Blocks() as demo:
    chatbot = gr.Chatbot(value=memory)
    msg = gr.Textbox(label="You")
    clear = gr.Button("Clear")

    msg.submit(chat_with_ai, [msg], [chatbot])
    clear.click(lambda: [], None, chatbot)

demo.launch()