import gradio as gr
import json
import torch
import wavio
import spaces

from tqdm import tqdm
from huggingface_hub import snapshot_download
from models import AudioDiffusion, DDPMScheduler
from audioldm.audio.stft import TacotronSTFT
from audioldm.variational_autoencoder import AutoencoderKL
from gradio import Markdown

# Automatic device detection
if torch.cuda.is_available():
    device_type = "cuda"
    device_selection = "cuda:0"
else:
    device_type = "cpu"
    device_selection = "cpu"

class Tango:
    def __init__(self, name = "declare-lab/tango2", device = device_selection):
        
        path = snapshot_download(repo_id = name)
        
        vae_config = json.load(open("{}/vae_config.json".format(path)))
        stft_config = json.load(open("{}/stft_config.json".format(path)))
        main_config = json.load(open("{}/main_config.json".format(path)))
        
        self.vae = AutoencoderKL(**vae_config).to(device)
        self.stft = TacotronSTFT(**stft_config).to(device)
        self.model = AudioDiffusion(**main_config).to(device)
        
        vae_weights = torch.load("{}/pytorch_model_vae.bin".format(path), map_location = device)
        stft_weights = torch.load("{}/pytorch_model_stft.bin".format(path), map_location = device)
        main_weights = torch.load("{}/pytorch_model_main.bin".format(path), map_location = device)
        
        self.vae.load_state_dict(vae_weights)
        self.stft.load_state_dict(stft_weights)
        self.model.load_state_dict(main_weights)

        print ("Successfully loaded checkpoint from:", name)
        
        self.vae.eval()
        self.stft.eval()
        self.model.eval()
        
        self.scheduler = DDPMScheduler.from_pretrained(main_config["scheduler_name"], subfolder = "scheduler")
        
    def chunks(self, lst, n):
        """ Yield successive n-sized chunks from a list. """
        for i in range(0, len(lst), n):
            yield lst[i:i + n]
        
    def generate(self, prompt, steps = 100, guidance = 3, samples = 1, disable_progress = True):
        """ Generate audio for a single prompt string. """
        with torch.no_grad():
            latents = self.model.inference([prompt], self.scheduler, steps, guidance, samples, disable_progress = disable_progress)
            mel = self.vae.decode_first_stage(latents)
            wave = self.vae.decode_to_waveform(mel)
        return wave[0]
    
    def generate_for_batch(self, prompts, steps = 200, guidance = 3, samples = 1, batch_size = 8, disable_progress = True):
        """ Generate audio for a list of prompt strings. """
        outputs = []
        for k in tqdm(range(0, len(prompts), batch_size)):
            batch = prompts[k: k + batch_size]
            with torch.no_grad():
                latents = self.model.inference(batch, self.scheduler, steps, guidance, samples, disable_progress = disable_progress)
                mel = self.vae.decode_first_stage(latents)
                wave = self.vae.decode_to_waveform(mel)
                outputs += [item for item in wave]
        if samples == 1:
            return outputs
        return list(self.chunks(outputs, samples))

# Initialize TANGO

tango = Tango(device = "cpu")
tango.vae.to(device_type)
tango.stft.to(device_type)
tango.model.to(device_type)
    
@spaces.GPU(duration = 60)
def gradio_generate(prompt, steps, guidance):
    output_wave = tango.generate(prompt, steps, guidance)
    # output_filename = f"{prompt.replace(' ', '_')}_{steps}_{guidance}"[:250] + ".wav"
    output_filename = "temp.wav"
    wavio.write(output_filename, output_wave, rate = 16000, sampwidth = 2)
    
    return output_filename

description_text = """
        <p style="text-align: center;">
        <b><big><big><big>Text-to-Audio</big></big></big></b>
        <br/>Generates an audio file, freely, without account, without watermark, that you can download.
        </p>
        <br/>
        <br/>
        🚀 Powered by <i>Tango 2</i> AI.
        <br/>
        <ul>
        <li>If you need to generate <b>music</b>, I recommend you to use <i>MusicGen</i>,</li>
        </ul>
        <br/>
        🐌 Slow process... Your computer must <b><u>not</u></b> enter into standby mode.<br/>You can duplicate this space on a free account, it works on CPU.<br/>
        <a href='https://huggingface.co/spaces/Fabrice-TIERCELIN/Text-to-Audio?duplicate=true'><img src='https://img.shields.io/badge/-Duplicate%20Space-blue?labelColor=white&style=flat&logo=data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAP5JREFUOE+lk7FqAkEURY+ltunEgFXS2sZGIbXfEPdLlnxJyDdYB62sbbUKpLbVNhyYFzbrrA74YJlh9r079973psed0cvUD4A+4HoCjsA85X0Dfn/RBLBgBDxnQPfAEJgBY+A9gALA4tcbamSzS4xq4FOQAJgCDwV2CPKV8tZAJcAjMMkUe1vX+U+SMhfAJEHasQIWmXNN3abzDwHUrgcRGmYcgKe0bxrblHEB4E/pndMazNpSZGcsZdBlYJcEL9Afo75molJyM2FxmPgmgPqlWNLGfwZGG6UiyEvLzHYDmoPkDDiNm9JR9uboiONcBXrpY1qmgs21x1QwyZcpvxt9NS09PlsPAAAAAElFTkSuQmCC&logoWidth=14'></a>
        <br/>
        ⚖️ You can use, modify and share the generated sounds but not for commercial uses.
        """
# Gradio input and output components
input_text = gr.Textbox(label = "Prompt", value = "Snort of a horse", lines = 2, autofocus = True)
output_audio = gr.Audio(label = "Generated Audio", type = "filepath")
denoising_steps = gr.Slider(label = "Steps", minimum = 100, maximum = 200, value = 100, step = 1, interactive = True)
guidance_scale = gr.Slider(label = "Guidance Scale", minimum = 1, maximum = 10, value = 3, step = 0.1, interactive = True)

# Gradio interface
gr_interface = gr.Interface(
    fn = gradio_generate,
    inputs = [input_text, denoising_steps, guidance_scale],
    outputs = [output_audio],
    title = "",
    description = description_text,
    allow_flagging = False,
    examples = [
        ["Quiet speech and then and airplane flying away"],
        ["A bicycle peddling on dirt and gravel followed by a man speaking then laughing"],
        ["Ducks quack and water splashes with some animal screeching in the background"],
        ["Describe the sound of the ocean"],
        ["A woman and a baby are having a conversation"],
        ["A man speaks followed by a popping noise and laughter"],
        ["A cup is filled from a faucet"],
        ["An audience cheering and clapping"],
        ["Rolling thunder with lightning strikes"],
        ["A dog barking and a cat mewing and a racing car passes by"],
        ["Gentle water stream, birds chirping and sudden gun shot"],
        ["A man talking followed by a goat baaing then a metal gate sliding shut as ducks quack and wind blows into a microphone."],
        ["A dog barking"],
        ["A cat meowing"],
        ["Wooden table tapping sound while water pouring"],
        ["Applause from a crowd with distant clicking and a man speaking over a loudspeaker"],
        ["two gunshots followed by birds flying away while chirping"],
        ["Whistling with birds chirping"],
        ["A person snoring"],
        ["Motor vehicles are driving with loud engines and a person whistles"],
        ["People cheering in a stadium while thunder and lightning strikes"],
        ["A helicopter is in flight"],
        ["A dog barking and a man talking and a racing car passes by"],
    ],
    cache_examples = "lazy", # Turn on to cache.
)

# Launch Gradio app
gr_interface.queue(10).launch()