import spaces
import torch
import gradio as gr
from transformers import pipeline, AutoModelForCausalLM, AutoTokenizer, AutoModel, LlamaTokenizer, LlamaForCausalLM
import numpy as np
from espnet2.bin.tts_inference import Text2Speech
#import yaml
#import os
import requests
import nltk
import scipy.io.wavfile
from flask import Flask, request, jsonify

app = Flask(__name__)  # Create the Flask app instance FIRST

try:
    nltk.data.find('taggers/averaged_perceptron_tagger_eng')
except LookupError:
    nltk.download('averaged_perceptron_tagger_eng')
try:
    nltk.data.find('corpora/cmudict')  # Check for cmudict
except LookupError:
    nltk.download('cmudict')

ASR_MODEL_NAME = "openai/whisper-medium.en"
asr_pipe = pipeline(
    task="automatic-speech-recognition",
    model=ASR_MODEL_NAME,
    chunk_length_s=30,
    device='cuda' if torch.cuda.is_available() else 'cpu', # Use GPU if available
)

all_special_ids = asr_pipe.tokenizer.all_special_ids
transcribe_token_id = all_special_ids[-5]
translate_token_id = all_special_ids[-6]

def _preload_and_load_models():
    global vicuna_tokenizer, vicuna_model
    #VICUNA_MODEL_NAME = "EleutherAI/gpt-neo-2.7B"  # Or another model
    #VICUNA_MODEL_NAME = "lmsys/vicuna-13b-v1.5"  # Or another model
    VICUNA_MODEL_NAME = "lmsys/vicuna-7b-v1.5"  # Or another model
    vicuna_tokenizer = LlamaTokenizer.from_pretrained(VICUNA_MODEL_NAME)
    vicuna_model = LlamaForCausalLM.from_pretrained(
        VICUNA_MODEL_NAME,
        torch_dtype=torch.float16,
     #   device_map="auto", # or.to('cuda')
    ).to('cuda') # Explicitly move to CUDA after loading

_preload_and_load_models()

tts = Text2Speech.from_pretrained("espnet/kan-bayashi_ljspeech_vits",device='cuda')

@app.route('/api/predict', methods=['POST'])  # The API endpoint
@spaces.GPU(required=True)
def process_audio(microphone, audio_upload, state, answer_mode):  # Added audio_upload
    audio_source = None
    if microphone:
        audio_source = microphone
        asr_pipe.model.config.forced_decoder_ids = [[2, transcribe_token_id ]]
        text = asr_pipe(audio_source)["text"]
    elif audio_upload:
        audio_source = audio_upload
        rate, data = scipy.io.wavfile.read(audio_source)
        asr_pipe.model.config.forced_decoder_ids = [[2, transcribe_token_id ]]
        text = asr_pipe(data)["text"]
    else:
        return state, state, None  # No audio input
    system_prompt = """You are a friendly and enthusiastic tutor for young children (ages 6-9).
        You answer questions clearly and simply, using age-appropriate language.
        You are also a little bit silly and like to make jokes."""
    prompt = f"{system_prompt}\nUser: {text}"
    with torch.no_grad():
        vicuna_input = vicuna_tokenizer(prompt, return_tensors="pt").to('cuda')
        if answer_mode == 'slow':
            vicuna_output = vicuna_model.generate(
                **vicuna_input,
                max_length = 512,
                min_new_tokens = 256,
                do_sample = True
            )
        if answer_mode == 'medium':
            vicuna_output = vicuna_model.generate(
                **vicuna_input,
                max_length = 128,
                min_new_tokens = 64,
                do_sample = True
            )
        if answer_mode == 'fast':
            vicuna_output = vicuna_model.generate(
                **vicuna_input,
                max_length = 42,
                min_new_tokens = 16,
                do_sample = True
            )
        vicuna_response = vicuna_tokenizer.decode(vicuna_output[0], skip_special_tokens=True)
    vicuna_response = vicuna_response.replace(prompt, "").strip()
    updated_state = state + "\nUser: " + text + "\n" + "Tutor: " + vicuna_response
    try:
        #with torch.no_grad():
        output = tts(vicuna_response)
        wav = output["wav"]
        sr = tts.fs
        audio_arr = wav.cpu().numpy()
        SAMPLE_RATE = sr
        audio_arr = audio_arr / np.abs(audio_arr).max()
        audio_output = (SAMPLE_RATE, audio_arr)
        #sf.write('generated_audio.wav', audio_arr, SAMPLE_RATE) # Removed writing to file
    except requests.exceptions.RequestException as e:
        print(f"Error in Hugging Face API request: {e}")
        audio_output = None
    except Exception as e:
        print(f"Error in speech synthesis: {e}")
        audio_output = None
    return updated_state, updated_state, audio_output

with gr.Blocks(title="Whisper, Vicuna, & TTS Demo") as demo:  # Updated title
    gr.Markdown("# Speech-to-Text-to-Speech Demo with Vicuna and Hugging Face TTS")
    gr.Markdown("Speak into your microphone, get a transcription, Vicuna will process it, and then you'll hear the result!")
    with gr.Tab("Transcribe & Synthesize"):
        with gr.Row(): # Added a row for better layout
            mic_input = gr.Audio(sources="microphone", type="filepath", label="Speak Here")
            audio_upload = gr.Audio(sources="upload", type="filepath", label="Or Upload Audio File") # Added upload component
        transcription_output = gr.Textbox(lines=5, label="Transcription and Vicuna Response")
        audio_output = gr.Audio(label="Synthesized Speech", type="numpy", autoplay=True)
        answer_mode = gr.Radio(["fast", "medium", "slow"], value='medium')
        transcription_state = gr.State(value="")

        mic_input.change(
            fn=process_audio,
            inputs=[mic_input, audio_upload, transcription_state, answer_mode], # Include audio_upload
            outputs=[transcription_output, transcription_state, audio_output]
        )
        audio_upload.change( # Added change event for upload
            fn=process_audio,
            inputs=[mic_input, audio_upload, transcription_state, answer_mode], # Include audio_upload
            outputs=[transcription_output, transcription_state, audio_output]
        )
        
if __name__ == '__main__':
    app.run(debug=True, port=5000) # Run Flask app
    demo.launch(share=False)