import time
import gradio as gr
from transformers import pipeline
import numpy as np
from openai import OpenAI
import threading
import queue

transcriber = pipeline("automatic-speech-recognition", model="openai/whisper-base.en")
qa_model = pipeline("question-answering", model="distilbert-base-cased-distilled-squad")

class PubSub:
    def __init__(self):
        self.subscribers = []

    def subscribe(self, callback):
        self.subscribers.append(callback)

    def publish(self, message):
        for subscriber in self.subscribers:
            subscriber(message)

def predict(message, history, api_key, is_paused, pubsub):
    def run_prediction():
        client = OpenAI(api_key=api_key)
        history_openai_format = []
        for human, assistant in history:
            history_openai_format.append({"role": "user", "content": human})
            history_openai_format.append({"role": "assistant", "content": assistant})
        history_openai_format.append({"role": "user", "content": message})

        response = client.chat.completions.create(
            model='gpt-4o',
            messages=history_openai_format,
            temperature=1.0,
            stream=True
        )

        partial_message = ""
        for chunk in response:
            if is_paused[0]:
                while is_paused[0]:
                    time.sleep(0.1)
            if chunk.choices[0].delta.content:
                partial_message += chunk.choices[0].delta.content
                pubsub.publish(partial_message)

    thread = threading.Thread(target=run_prediction)
    thread.start()

def chat_with_api_key(api_key, message, history, is_paused):
    pubsub = PubSub()
    result_queue = queue.Queue()

    def update_message(partial_message):
        result_queue.put(partial_message)

    pubsub.subscribe(update_message)
    predict(message, history, api_key, is_paused, pubsub)

    while True:
        try:
            accumulated_message = result_queue.get(timeout=0.1)
            history.append((message, accumulated_message))
            yield message, [[message, accumulated_message]]
        except queue.Empty:
            if not any(thread.is_alive() for thread in threading.enumerate() if thread != threading.current_thread()):
                break

def transcribe(audio):
    if audio is None:
        return "No audio recorded."
    sr, y = audio
    y = y.astype(np.float32)
    y /= np.max(np.abs(y))
    return transcriber({"sampling_rate": sr, "raw": y})["text"]

def answer(transcription):
    context = "You are a chatbot answering general questions"
    result = qa_model(question=transcription, context=context)
    return result['answer']

def process_audio(audio):
    if audio is None:
        return "No audio recorded.", []
    transcription = transcribe(audio)
    answer_result = answer(transcription)
    return transcription, [[transcription, answer_result]]

def update_output(api_key, audio_input, state, is_paused):
    if is_paused[0]:
        yield "", state
    else:
        message = transcribe(audio_input)
        responses = chat_with_api_key(api_key, message, state, is_paused)
        for response, updated_state in responses:
            if is_paused[0]:
                break
            yield response, updated_state

def clear_all():
    return None, "", []

def toggle_pause(is_paused):
    is_paused[0] = not is_paused[0]
    return is_paused

def update_button_label(is_paused):
    return "Resume" if is_paused[0] else "Pause"

with gr.Blocks() as demo:
    answer_output = gr.Chatbot(label="Answer Result")
    with gr.Row():    
        audio_input = gr.Audio(label="Audio Input", sources=["microphone"], type="numpy")
        with gr.Column():
            api_key = gr.Textbox(label="API Key", placeholder="Enter your API key", type="password")
            transcription_output = gr.Textbox(label="Transcription")
            clear_button = gr.Button("Clear")
            pause_button = gr.Button("Pause")
    
    state = gr.State([])
    is_paused = gr.State([False])

    audio_input.stop_recording(
        fn=update_output,
        inputs=[api_key, audio_input, state, is_paused],
        outputs=[transcription_output, answer_output]
    )
    
    clear_button.click(
        fn=clear_all,
        inputs=[],
        outputs=[audio_input, transcription_output, answer_output]
    )

    pause_button.click(
        fn=toggle_pause,
        inputs=[is_paused],
        outputs=[is_paused]
    ).then(
        fn=update_button_label,
        inputs=[is_paused],
        outputs=[pause_button]
    )

demo.launch()