from pathlib import Path
import torchaudio
import gradio as gr

import numpy as np

import torch
import json


from hifigan.config import v1
from hifigan.denoiser import Denoiser
from hifigan.env import AttrDict
from hifigan.models import Generator as HiFiGAN


from pflow.models.pflow_tts import pflowTTS
from pflow.text import  text_to_sequence, sequence_to_text
from pflow.utils.utils import intersperse
from pflow.data.text_mel_datamodule import mel_spectrogram
from pflow.utils.model import normalize
from vocos import Vocos





PFLOW_MODEL_PATH = 'checkpoints/checkpoint_epoch=649.ckpt'
#PFLOW_MODEL_PATH = 'checkpoint_m_epoch=054.ckpt'
VOCODER_MODEL_PATH = 'checkpoints/pytorch_model.bin'
HIFIGAN_MODEL_PATH = 'checkpoints/g_00120000'


transform = torchaudio.transforms.Vol(gain=-32, gain_type="db")
wav, sr = torchaudio.load('prompt.wav')

prompt = mel_spectrogram(
            wav,
            1024,
            80,
            22050,
            256,
            1024,
            0,
            8000,
            center=False,
        )[:,:,:264]




def process_text(text: str, device: torch.device):
    x = torch.tensor(
        intersperse(text_to_sequence(text, ["ukr_cleaners"]), 0),
        dtype=torch.long,
        device=device,
    )[None]
    x_lengths = torch.tensor([x.shape[-1]], dtype=torch.long, device=device)
    x_phones = sequence_to_text(x.squeeze(0).tolist())
    return {"x_orig": text, "x": x, "x_lengths": x_lengths, 'x_phones':x_phones}




def load_hifigan(checkpoint_path, device):
    h = AttrDict(v1)
    hifigan = HiFiGAN(h).to(device)
    hifigan.load_state_dict(torch.load(checkpoint_path, map_location=device)["generator"])
    _ = hifigan.eval()
    hifigan.remove_weight_norm()
    return hifigan




def load_vocos(checkpoint_path, config_path, device):
    model = Vocos.from_hparams(config_path)

    raw_model = torch.load(checkpoint_path, map_location=torch.device('cpu'))
    raw_model = raw_model if 'state_dict' not in raw_model else raw_model['state_dict']
    model.load_state_dict(raw_model, strict=False)
    model.eval()
    return model


def to_waveform(mel, vocoder, denoiser=None):
    return  vocoder.decode(mel).cpu().squeeze()

    # audio = vocoder(mel).clamp(-1, 1)
    # if denoiser is not None:
    #     audio = denoiser(audio.squeeze(), strength=0.00025).cpu().squeeze()

    # return audio.cpu().squeeze()






def get_device():
    if torch.cuda.is_available():
        print("[+] GPU Available! Using GPU")
        device = torch.device("cuda")
    else:
        print("[-] GPU not available or forced CPU run! Using CPU")
        device = torch.device("cpu")
    return device


device = get_device()
model = pflowTTS.load_from_checkpoint(PFLOW_MODEL_PATH, map_location=device)
_ = model.eval()


#hifigan = load_hifigan(HIFIGAN_MODEL_PATH, device)
vocos = load_vocos(VOCODER_MODEL_PATH, 'config.yaml', device)
#vocos_44100 = load_vocos('checkpoints/vocos_checkpoint_epoch=4_step=93440_val_loss=5.2596_44100_10.ckpt', 'vocos.yaml', device)
denoiser = None#Denoiser(vocoder, mode="zeros")


@torch.inference_mode()
def synthesise(text, speed):
    if len(text) > 1000:
        raise gr.Error("Текст повинен бути коротшим за 1000 символів.")

    text_processed = process_text(text.strip(), device)

    output = model.synthesise(
        text_processed["x"].to(device),
        text_processed["x_lengths"].to(device),
        n_timesteps=40,
        temperature=0.0,
        length_scale=1/speed,
        prompt=normalize(prompt, model.mel_mean, model.mel_std).to(device),

        guidance_scale=1.5

    )
    waveform_vocos = vocos.decode(output["mel"]).squeeze()
    #waveform_vocos_44100 = vocos_44100.decode(output["mel"]).cpu().squeeze()
    #waveform_hifigan = hifigan(output["mel"]).clamp(-1, 1).cpu().squeeze()
    #transform = torchaudio.transforms.Vol(gain=-18, gain_type="db")


    return text_processed['x_phones'][1::2], (22050, waveform_vocos.numpy())


description = f'''
# Експериментальна апка для генерації аудіо з тексту.

    pflow checkpoint {PFLOW_MODEL_PATH}
    vocoder: Vocos - {VOCODER_MODEL_PATH}
'''


if __name__ == "__main__":
    i = gr.Interface(
        fn=synthesise,
        description=description,
        inputs=[
            gr.Text(label='Текст для синтезу:', lines=5, max_lines=10),
            gr.Slider(minimum=0.6, maximum=2.0, label="Швидкість", value=1.0)
        ],
        outputs=[
            gr.Text(label='Фонемізований текст:', lines=5),
            # gr.Audio(
            #             label="Vocos 44100 аудіо:",
            #             autoplay=False,
            #             streaming=False,
            #             type="numpy",
            #         ),
            gr.Audio(
                        label="Vocos аудіо:",
                        autoplay=False,
                        streaming=False,
                        type="numpy",
                    ),
            # gr.Audio(
            #             label="HIFIGAN аудіо:",
            #             autoplay=False,
            #             streaming=False,
            #             type="numpy",
            #         )
            
        ],
        allow_flagging ='manual',
        flagging_options=[("Якщо дуже погоне аудіо, тисни цю кнопку.", "negative")],
        cache_examples=True,
        title='',
        # description=description,
        # article=article,
        # examples=examples,
    )
    i.queue(max_size=20, default_concurrency_limit=4)
    i.launch(share=False, server_name="0.0.0.0")