# Agung Wijaya - WebUI 2023 - Gradio
# file app.py

# Import
import os
import psutil
import shutil
import numpy as np
import gradio as gr
import subprocess
from pathlib import Path
import ffmpeg
import json
import re
import time
import random
import torch
import librosa
import util

import matplotlib.pyplot as plt
from PIL import Image, ImageDraw, ImageFont
from moviepy.editor import *
from moviepy.video.io.VideoFileClip import VideoFileClip

from config import device
from infer_pack.models import (
    SynthesizerTrnMs256NSFsid,
    SynthesizerTrnMs256NSFsid_nono
)
from vc_infer_pipeline import VC
from typing import Union
from os import path, getenv
from datetime import datetime
from scipy.io.wavfile import write
from pydub import AudioSegment

title_markdown = ("""
<h1 align="center"><img src="https://upload.wikimedia.org/wikipedia/zh/d/d0/Kite_album.jpg", alt="syz" border="0" style="margin: 0 auto; height: 300px;" /> </h1>
""")
title_markdown2 = ("""
<h1 align="center"><img src="https://e.snmc.io/i/600/w/28577c025a5c82728a1b957ee373bc43/9622540/%E8%AE%B8%E5%B5%A9-xu-song-%E8%87%AA%E5%AE%9A%E7%BE%A9-cover-art.jpg", alt="vae" border="0" style="margin: 0 auto; height: 300px;" /> </h1>
""")
# Reference: https://huggingface.co/spaces/zomehwh/rvc-models/blob/main/app.py#L21  # noqa
in_hf_space = getenv('SYSTEM') == 'spaces'

# Set High Quality (.wav) or not (.mp3)
high_quality = True

# Read config.json
config_json = json.loads(open("config.json").read())

# Load hubert model
hubert_model = util.load_hubert_model(device, 'hubert_base.pt')
hubert_model.eval()

# Load models
loaded_models = []
for model_name in config_json.get('models'):
    print(f'Loading model: {model_name}')

    # Load model info
    model_info = json.load(
        open(path.join('model', model_name, 'config.json'), 'r')
    )

    # Load RVC checkpoint
    cpt = torch.load(
        path.join('model', model_name, model_info['model']),
        map_location='cpu'
    )
    
    tgt_sr = cpt['config'][-1]
    
    cpt['config'][-3] = cpt['weight']['emb_g.weight'].shape[0]  # n_spk

    if_f0 = cpt.get('f0', 1)
    net_g: Union[SynthesizerTrnMs256NSFsid, SynthesizerTrnMs256NSFsid_nono]
    if if_f0 == 1:
        net_g = SynthesizerTrnMs256NSFsid(
            *cpt['config'],
            is_half=util.is_half(device)
        )
    else:
        net_g = SynthesizerTrnMs256NSFsid_nono(*cpt['config'])

    del net_g.enc_q

    # According to original code, this thing seems necessary.
    print(net_g.load_state_dict(cpt['weight'], strict=False))

    net_g.eval().to(device)
    net_g = net_g.half() if util.is_half(device) else net_g.float()

    vc = VC(tgt_sr, device)
    
    loaded_models.append(dict(
        name=model_name,
        metadata=model_info,
        vc=vc,
        net_g=net_g,
        if_f0=if_f0,
        target_sr=tgt_sr
    ))
print(f'Models loaded: {len(loaded_models)}')

def make_bars_image(height_values, index, new_height):
    
    # Define the size of the image
    width = 512  
    height = new_height
    
    # Create a new image with a transparent background
    image = Image.new('RGBA', (width, height), color=(0, 0, 0, 0))
    
    # Get the image drawing context
    draw = ImageDraw.Draw(image)
    
    # Define the rectangle width and spacing
    rect_width = 2
    spacing = 2
    
    # Define the list of height values for the rectangles
    #height_values = [20, 40, 60, 80, 100, 80, 60, 40]
    num_bars = len(height_values)
    # Calculate the total width of the rectangles and the spacing
    total_width = num_bars * rect_width + (num_bars - 1) * spacing
    
    # Calculate the starting position for the first rectangle
    start_x = int((width - total_width) / 2)
    # Define the buffer size
    buffer_size = 80
    # Draw the rectangles from left to right
    x = start_x
    for i, height in enumerate(height_values):
        
        # Define the rectangle coordinates
        y0 = buffer_size
        y1 = height + buffer_size
        x0 = x
        x1 = x + rect_width

        # Draw the rectangle
        draw.rectangle([x0, y0, x1, y1], fill='white')  
        
        # Move to the next rectangle position
        if i < num_bars - 1:
            x += rect_width + spacing
        

    # Rotate the image by 180 degrees
    image = image.rotate(180)
    
    # Mirror the image
    image = image.transpose(Image.FLIP_LEFT_RIGHT)
    
    # Save the image
    image.save('audio_bars_'+ str(index) + '.png')

    return 'audio_bars_'+ str(index) + '.png'

def db_to_height(db_value):
    # Scale the dB value to a range between 0 and 1
    scaled_value = (db_value + 80) / 80
    
    # Convert the scaled value to a height between 0 and 100
    height = scaled_value * 50
    
    return height

def infer(title, audio_in, image_in):
    # Load the audio file
    audio_path = audio_in
    audio_data, sr = librosa.load(audio_path)

    # Get the duration in seconds
    duration = librosa.get_duration(y=audio_data, sr=sr)
    
    # Extract the audio data for the desired time
    start_time = 0 # start time in seconds
    end_time = duration # end time in seconds
    
    start_index = int(start_time * sr)
    end_index = int(end_time * sr)
    
    audio_data = audio_data[start_index:end_index]
    
    # Compute the short-time Fourier transform
    hop_length = 512

    
    stft = librosa.stft(audio_data, hop_length=hop_length)
    spectrogram = librosa.amplitude_to_db(np.abs(stft), ref=np.max)

    # Get the frequency values
    freqs = librosa.fft_frequencies(sr=sr, n_fft=stft.shape[0])

    # Select the indices of the frequency values that correspond to the desired frequencies
    n_freqs = 114
    freq_indices = np.linspace(0, len(freqs) - 1, n_freqs, dtype=int)
    
    # Extract the dB values for the desired frequencies
    db_values = []
    for i in range(spectrogram.shape[1]):
        db_values.append(list(zip(freqs[freq_indices], spectrogram[freq_indices, i])))
    
    # Print the dB values for the first time frame
    print(db_values[0])

    proportional_values = []

    for frame in db_values:
        proportional_frame = [db_to_height(db) for f, db in frame]
        proportional_values.append(proportional_frame)

    print(proportional_values[0])
    print("AUDIO CHUNK: " + str(len(proportional_values)))

    # Open the background image
    background_image = Image.open(image_in)
    
    # Resize the image while keeping its aspect ratio
    bg_width, bg_height = background_image.size
    aspect_ratio = bg_width / bg_height
    new_width = 512
    new_height = int(new_width / aspect_ratio)
    resized_bg = background_image.resize((new_width, new_height))

    # Apply black cache for better visibility of the white text
    bg_cache = Image.open('black_cache.png')
    resized_bg.paste(bg_cache, (0, resized_bg.height - bg_cache.height), mask=bg_cache)

    # Create a new ImageDraw object
    draw = ImageDraw.Draw(resized_bg)
    
    # Define the text to be added
    text = title
    font = ImageFont.truetype("Lato-Regular.ttf", 16)
    text_color = (255, 255, 255) # white color
    
    # Calculate the position of the text
    text_width, text_height = draw.textsize(text, font=font)
    x = 30
    y = new_height - 70
    
    # Draw the text on the image
    draw.text((x, y), text, fill=text_color, font=font)

    # Save the resized image
    resized_bg.save('resized_background.jpg')
    
    generated_frames = []
    for i, frame in enumerate(proportional_values): 
        bars_img = make_bars_image(frame, i, new_height)
        bars_img = Image.open(bars_img)
        # Paste the audio bars image on top of the background image
        fresh_bg = Image.open('resized_background.jpg')
        fresh_bg.paste(bars_img, (0, 0), mask=bars_img)
        # Save the image
        fresh_bg.save('audio_bars_with_bg' + str(i) + '.jpg')
        generated_frames.append('audio_bars_with_bg' + str(i) + '.jpg')
    print(generated_frames)

    # Create a video clip from the images
    clip = ImageSequenceClip(generated_frames, fps=len(generated_frames)/(end_time-start_time))
    audio_clip = AudioFileClip(audio_in)
    clip = clip.set_audio(audio_clip)
    # Set the output codec
    codec = 'libx264'
    audio_codec = 'aac'
    # Save the video to a file
    clip.write_videofile("my_video.mp4", codec=codec, audio_codec=audio_codec)

    retimed_clip = VideoFileClip("my_video.mp4")

    # Set the desired frame rate
    new_fps = 25
    
    # Create a new clip with the new frame rate
    new_clip = retimed_clip.set_fps(new_fps)
    
    # Save the new clip as a new video file
    new_clip.write_videofile("my_video_retimed.mp4", codec=codec, audio_codec=audio_codec)

    return "my_video_retimed.mp4"

# Command line test
def command_line_test():
    command = "df -h /home/user/app"
    process = subprocess.run(command.split(), stdout=subprocess.PIPE)
    result  = process.stdout.decode()
    return gr.HTML(value=result)

def mix(audio1, audio2):
  sound1 = AudioSegment.from_file(audio1)
  sound2 = AudioSegment.from_file(audio2)
  length = len(sound1)
  mixed = sound1[:length].overlay(sound2)

  mixed.export("song.wav", format="wav")

  return "song.wav"

    
# Function YouTube Downloader Audio
def youtube_downloader(
    video_identifier,
    start_time,
    end_time,
    output_filename="track.wav",
    num_attempts=5,
    url_base="",
    quiet=False,
    force=True,
):
    output_path = Path(output_filename)
    if output_path.exists():
        if not force:
            return output_path
        else:
            output_path.unlink()

    quiet = "--quiet --no-warnings" if quiet else ""
    command = f"""
        yt-dlp {quiet} -x --audio-format wav -f bestaudio -o "{output_filename}" --download-sections "*{start_time}-{end_time}" "{url_base}{video_identifier}"  # noqa: E501
    """.strip()

    attempts = 0
    while True:
        try:
            _ = subprocess.check_output(command, shell=True, stderr=subprocess.STDOUT)
        except subprocess.CalledProcessError:
            attempts += 1
            if attempts == num_attempts:
                return None
        else:
            break

    if output_path.exists():
        return output_path
    else:
        return None
    
# Function Audio Separated
def audio_separated(audio_input, progress=gr.Progress()):
    # start progress
    progress(progress=0, desc="Starting...")
    time.sleep(0.1)

    # check file input
    if audio_input is None:
        # show progress
        for i in progress.tqdm(range(100), desc="Please wait..."):
            time.sleep(0.01)
            
        return (None, None, 'Please input audio.')

    # create filename
    filename = str(random.randint(10000,99999))+datetime.now().strftime("%d%m%Y%H%M%S")
    
    # progress
    progress(progress=0.10, desc="Please wait...")
    
    # make dir output
    os.makedirs("output", exist_ok=True)
    
    # progress
    progress(progress=0.20, desc="Please wait...")
    
    # write
    if high_quality:
        write(filename+".wav", audio_input[0], audio_input[1])
    else:
        write(filename+".mp3", audio_input[0], audio_input[1])
        
    # progress
    progress(progress=0.50, desc="Please wait...")

    # demucs process
    if high_quality:
        command_demucs = "python3 -m demucs --two-stems=vocals -d cpu "+filename+".wav -o output"
    else:
        command_demucs = "python3 -m demucs --two-stems=vocals --mp3 --mp3-bitrate 128 -d cpu "+filename+".mp3 -o output"
    
    os.system(command_demucs)
    
    # progress
    progress(progress=0.70, desc="Please wait...")
    
    # remove file audio
    if high_quality:
        command_delete = "rm -v ./"+filename+".wav"
    else:
        command_delete = "rm -v ./"+filename+".mp3"
    
    os.system(command_delete)
    
    # progress
    progress(progress=0.80, desc="Please wait...")
    
    # progress
    for i in progress.tqdm(range(80,100), desc="Please wait..."):
        time.sleep(0.1)

    if high_quality:
        return "./output/htdemucs/"+filename+"/vocals.wav","./output/htdemucs/"+filename+"/no_vocals.wav","Successfully..."
    else:
        return "./output/htdemucs/"+filename+"/vocals.mp3","./output/htdemucs/"+filename+"/no_vocals.mp3","Successfully..."
        
# Function Voice Changer
def voice_changer(audio_input, model_index, pitch_adjust, f0_method, feat_ratio, progress=gr.Progress()):
    # start progress
    progress(progress=0, desc="Starting...")
    time.sleep(1)
    
    # check file input
    if audio_input is None:
        # progress
        for i in progress.tqdm(range(100), desc="Please wait..."):
            time.sleep(0.1)
            
        return (None, 'Please input audio.')
        
    # check model input
    if model_index is None:
        # progress
        for i in progress.tqdm(range(100), desc="Please wait..."):
            time.sleep(0.1)
            
        return (None, 'Please select a model.')

    model = loaded_models[model_index]

    # Reference: so-vits
    (audio_samp, audio_npy) = audio_input

    # progress
    progress(progress=0.10, desc="Please wait...")

    # https://huggingface.co/spaces/zomehwh/rvc-models/blob/main/app.py#L49
    if (audio_npy.shape[0] / audio_samp) > 60 and in_hf_space:
        
        # progress
        for i in progress.tqdm(range(10,100), desc="Please wait..."):
            time.sleep(0.1)
            
        return (None, 'Input audio is longer than 60 secs.')

    # Bloody hell: https://stackoverflow.com/questions/26921836/
    if audio_npy.dtype != np.float32:  # :thonk:
        audio_npy = (
            audio_npy / np.iinfo(audio_npy.dtype).max
        ).astype(np.float32)
        
    # progress
    progress(progress=0.30, desc="Please wait...")

    if len(audio_npy.shape) > 1:
        audio_npy = librosa.to_mono(audio_npy.transpose(1, 0))

    # progress
    progress(progress=0.40, desc="Please wait...")

    if audio_samp != 16000:
        audio_npy = librosa.resample(
            audio_npy,
            orig_sr=audio_samp,
            target_sr=16000
        )

    # progress
    progress(progress=0.50, desc="Please wait...")
    
    pitch_int = int(pitch_adjust)

    times = [0, 0, 0]
    output_audio = model['vc'].pipeline(
        hubert_model,
        model['net_g'],
        model['metadata'].get('speaker_id', 0),
        audio_npy,
        times,
        pitch_int,
        f0_method,
        path.join('model', model['name'], model['metadata']['feat_index']),
        path.join('model', model['name'], model['metadata']['feat_npy']),
        feat_ratio,
        model['if_f0']
    )

    # progress
    progress(progress=0.80, desc="Please wait...")

    print(f'npy: {times[0]}s, f0: {times[1]}s, infer: {times[2]}s')

    # progress
    for i in progress.tqdm(range(80,100), desc="Please wait..."):
        time.sleep(0.1)

    return ((model['target_sr'], output_audio), 'Successfully...')
    
# Function Text to Voice
def text_to_voice(text_input, model_index):
    # start progress
    progress(progress=0, desc="Starting...")
    time.sleep(1)
    
    # check text input
    if text_input is None:
        # progress
        for i in progress.tqdm(range(2,100), desc="Please wait..."):
            time.sleep(0.1)
            
        return (None, 'Please write text.')
        
    # check model input
    if model_index is None:
        # progress
        for i in progress.tqdm(range(2,100), desc="Please wait..."):
            time.sleep(0.1)
            
        return (None, 'Please select a model.')

    # progress
    for i in progress.tqdm(range(2,100), desc="Please wait..."):
        time.sleep(0.1)
            
    return None, "Sorry, you can't use it yet because this program is being developed!"

# Themes
theme = gr.themes.Base()

# CSS
css = "footer {visibility: hidden}"

# Blocks
with gr.Blocks(theme=theme, css=css) as App:

    # Header
    gr.HTML("<center>"
            "<h1>🥳🎶🎡 - AI歌手，RVC歌声转换</h1>"
            "</center>")
    gr.Markdown("### <center>🦄 - 能够自动提取视频中的声音，并去除背景音；Powered by [RVC-Project](https://github.com/RVC-Project/Retrieval-based-Voice-Conversion-WebUI)</center>")
    gr.Markdown("### <center>更多精彩应用，敬请关注[滔滔AI](http://www.talktalkai.com)；滔滔AI，为爱滔滔！💕</center>")
    # Information
    with gr.Accordion("🎙️您的AI歌手Stefanie："):                      
        gr.Markdown(title_markdown)
    with gr.Accordion("🎤您的AI歌手Vae："):                      
        gr.Markdown(title_markdown2)

    # Tab YouTube Downloader
    with gr.Tab("🤗 - B站视频提取声音"):
        with gr.Row():
            with gr.Column():
                ydl_url_input  = gr.Textbox(label="B站视频网址(请填写相应的BV号)", value = "https://www.bilibili.com/video/BV...")
                start = gr.Number(value=0, label="起始时间 (秒)")
                end = gr.Number(value=15, label="结束时间 (秒)")
                ydl_url_submit = gr.Button("提取声音文件吧", variant="primary")
                as_audio_submit = gr.Button("去除背景音吧", variant="primary")
            with gr.Column():
                ydl_audio_output = gr.Audio(label="Audio from Bilibili")
                as_audio_input  = ydl_audio_output
                as_audio_vocals    = gr.Audio(label="Vocal only")
                as_audio_no_vocals = gr.Audio(label="Music only", type="filepath")
                as_audio_message   = gr.Textbox(label="Message", visible=False)
                
    ydl_url_submit.click(fn=youtube_downloader, inputs=[ydl_url_input, start, end], outputs=[ydl_audio_output])
    as_audio_submit.click(fn=audio_separated, inputs=[as_audio_input], outputs=[as_audio_vocals, as_audio_no_vocals, as_audio_message], show_progress=True, queue=True)

    # Tab Voice Changer
    with gr.Tab("🎶 - 歌声转换"):
        with gr.Row():
            with gr.Column():
                vc_audio_input  = as_audio_vocals
                vc_model_index  = gr.Dropdown(
                    [
                        '%s' % (
                            m['metadata'].get('name')
                        )
                        for m in loaded_models
                    ],
                    label='Models',
                    type='index'
                )
                vc_pitch_adjust = gr.Slider(label='Pitch', minimum=-24, maximum=24, step=1, value=0)
                vc_f0_method    = gr.Radio(label='F0 methods', choices=['pm', 'harvest'], value='pm', interactive=True)
                vc_feat_ratio   = gr.Slider(label='Feature ratio', minimum=0, maximum=1, step=0.1, value=0.6)
                vc_audio_submit = gr.Button("进行歌声转换吧！", variant="primary")
                full_song = gr.Button("加入歌曲伴奏吧！", variant="primary")
            with gr.Column():
                vc_audio_output  = gr.Audio(label="Result audio", type="filepath")
                vc_audio_message = gr.Textbox(label="Message")
                new_song = gr.Audio(label="Full song", type="filepath")
    vc_audio_submit.click(fn=voice_changer, inputs=[vc_audio_input, vc_model_index, vc_pitch_adjust, vc_f0_method, vc_feat_ratio], outputs=[vc_audio_output, vc_audio_message], show_progress=True, queue=True)
    full_song.click(fn=mix, inputs=[vc_audio_output, as_audio_no_vocals], outputs=[new_song])


    with gr.Tab("📺 - 音乐视频"):
        with gr.Row():
            with gr.Column():
                inp1 = gr.Textbox(label="为视频配上精彩的文案吧(选填;英文)")
                inp2 = new_song
                inp3 = gr.Image(source='upload', type='filepath', label="上传一张背景图片吧")
                btn = gr.Button("生成您的专属音乐视频吧", variant="primary")
              
            with gr.Column():
                out1 = gr.Video(label='您的专属音乐视频')
    btn.click(fn=infer, inputs=[inp1, inp2, inp3], outputs=[out1])
                
    gr.Markdown("### <center>注意❗：请不要生成会对个人以及组织造成侵害的内容，此程序仅供科研、学习及个人娱乐使用。</center>")
    gr.HTML('''
        <div class="footer">
                    <p>🌊🏞️🎶 - 江水东流急，滔滔无尽声。 明·顾璘
                    </p>
        </div>
    ''')
    
# Launch
App.queue(concurrency_count=1, max_size=20).launch(server_name="0.0.0.0", server_port=7860, show_error=True)

# Enjoy