import gradio as gr
from transformers import pipeline

import librosa
import numpy as np
import torch

from transformers import SpeechT5Processor, SpeechT5ForTextToSpeech, SpeechT5HifiGan
from transformers import AutoProcessor, AutoModelForCausalLM


checkpoint = "microsoft/speecht5_tts"
tts_processor = SpeechT5Processor.from_pretrained(checkpoint)
tts_model = SpeechT5ForTextToSpeech.from_pretrained(checkpoint)
vocoder = SpeechT5HifiGan.from_pretrained("microsoft/speecht5_hifigan")


vqa_processor = AutoProcessor.from_pretrained("microsoft/git-base-textvqa")
vqa_model = AutoModelForCausalLM.from_pretrained("microsoft/git-base-textvqa")

def tts(text):
    if len(text.strip()) == 0:
        return (16000, np.zeros(0).astype(np.int16))

    inputs = tts_processor(text=text, return_tensors="pt")

    # limit input length
    input_ids = inputs["input_ids"]
    input_ids = input_ids[..., :tts_model.config.max_text_positions]

    # if speaker == "Surprise Me!":
    #     # load one of the provided speaker embeddings at random
    #     idx = np.random.randint(len(speaker_embeddings))
    #     key = list(speaker_embeddings.keys())[idx]
    #     speaker_embedding = np.load(speaker_embeddings[key])

    #     # randomly shuffle the elements
    #     np.random.shuffle(speaker_embedding)

    #     # randomly flip half the values
    #     x = (np.random.rand(512) >= 0.5) * 1.0
    #     x[x == 0] = -1.0
    #     speaker_embedding *= x

        #speaker_embedding = np.random.rand(512).astype(np.float32) * 0.3 - 0.15
    # else:
    speaker_embedding = np.load("cmu_us_bdl_arctic-wav-arctic_a0009.npy")

    speaker_embedding = torch.tensor(speaker_embedding).unsqueeze(0)

    speech = tts_model.generate_speech(input_ids, speaker_embedding, vocoder=vocoder)

    speech = (speech.numpy() * 32767).astype(np.int16)
    return (16000, speech)


# captioner = pipeline(model="microsoft/git-base")
# tts = TTS(model_name="tts_models/multilingual/multi-dataset/your_tts", progress_bar=False, gpu=False)


def predict(image, prompt):
    # text = captioner(image)[0]["generated_text"]

    # audio_output = "output.wav"
    # tts.tts_to_file(text, speaker=tts.speakers[0], language="en", file_path=audio_output)

    pixel_values = vqa_processor(images=image, return_tensors="pt").pixel_values

    # prompt = "what is in the scene?"
    prompt_ids = vqa_processor(text=prompt, add_special_tokens=False).input_ids
    prompt_ids = [vqa_processor.tokenizer.cls_token_id] + prompt_ids
    prompt_ids = torch.tensor(prompt_ids).unsqueeze(0)
    
    text_ids = vqa_model.generate(pixel_values=pixel_values, input_ids=prompt_ids, max_length=50)
    text = vqa_processor.batch_decode(text_ids, skip_special_tokens=True)[0][len(prompt):]
    
    audio = tts(text)
    
    return text, audio


demo = gr.Interface(
    fn=predict,
    inputs=[gr.Image(type="pil",label="Environment"), gr.Textbox(label="Prompt", value="What is in the scene?")],
    outputs=[gr.Textbox(label="Caption"), gr.Audio(type="numpy",label="Audio Feedback")],
    css=".gradio-container {background-color: #002A5B}",
    theme=gr.themes.Soft()
)

demo.launch()