import json
import os
import subprocess
from pathlib import Path

import gradio as gr
import librosa
import numpy as np
import torch
from demucs.apply import apply_model
from demucs.pretrained import DEFAULT_MODEL, get_model
from huggingface_hub import hf_hub_download, list_repo_files

from so_vits_svc_fork.hparams import HParams
from so_vits_svc_fork.inference.core import Svc


###################################################################
# REPLACE THESE VALUES TO CHANGE THE MODEL REPO/CKPT NAME/SETTINGS
###################################################################
# The Hugging Face Hub repo ID - 在这里修改repo_id，可替换成任何已经训练好的模型！
repo_ids = ["nijisakai/sunyanzi", "kevinwang676/jay","nijisakai/Eric_Cartman"]

# If None, Uses latest ckpt in the repo
ckpt_name = None

# If None, Uses "kmeans.pt" if it exists in the repo
cluster_model_name = None

# Set the default f0 type to use - use the one it was trained on.
# The default for so-vits-svc-fork is "dio".
# Options: "crepe", "crepe-tiny", "parselmouth", "dio", "harvest"
default_f0_method = "crepe"

# The default ratio of cluster inference to SVC inference.
# If cluster_model_name is not found in the repo, this is set to 0.
default_cluster_infer_ratio = 0.5

# Limit on duration of audio at inference time. increase if you can
# In this parent app, we set the limit with an env var to 30 seconds
# If you didnt set env var + you go OOM try changing 9e9 to <=300ish
duration_limit = int(os.environ.get("MAX_DURATION_SECONDS", 9e9))
###################################################################

models = []
speakers = []
for repo_id in repo_ids:
    # Figure out the latest generator by taking highest value one.
    # Ex. if the repo has: G_0.pth, G_100.pth, G_200.pth, we'd use G_200.pth
    if ckpt_name is None:
        latest_id = sorted(
            [
                int(Path(x).stem.split("_")[1])
                for x in list_repo_files(repo_id)
                if x.startswith("G_") and x.endswith(".pth")
            ]
        )[-1]
        ckpt_name = f"G_{latest_id}.pth"

    cluster_model_name = cluster_model_name or "kmeans.pt"
    if cluster_model_name in list_repo_files(repo_id):
        print(f"Found Cluster model - Downloading {cluster_model_name} from {repo_id}")
        cluster_model_path = hf_hub_download(repo_id, cluster_model_name)
    else:
        print(f"Could not find {cluster_model_name} in {repo_id}. Using None")
        cluster_model_path = None
    default_cluster_infer_ratio = default_cluster_infer_ratio if cluster_model_path else 0

    generator_path = hf_hub_download(repo_id, ckpt_name)
    config_path = hf_hub_download(repo_id, "config.json")
    hparams = HParams(**json.loads(Path(config_path).read_text()))
    speaker = list(hparams.spk.keys())
    speakers.extend(speaker)
    device = "cuda" if torch.cuda.is_available() else "cpu"
    model = Svc(net_g_path=generator_path, config_path=config_path, device=device, cluster_model_path=cluster_model_path)
    models.append(model)

    # Reset ckpt_name and cluster_model_name for the next iteration
    ckpt_name = None
    cluster_model_name = None

demucs_model = get_model(DEFAULT_MODEL)

def extract_vocal_demucs(model, filename, sr=44100, device=None, shifts=1, split=True, overlap=0.25, jobs=0):
    wav, sr = librosa.load(filename, mono=False, sr=sr)
    wav = torch.tensor(wav)
    ref = wav.mean(0)
    wav = (wav - ref.mean()) / ref.std()
    sources = apply_model(
        model, wav[None], device=device, shifts=shifts, split=split, overlap=overlap, progress=True, num_workers=jobs
    )[0]
    sources = sources * ref.std() + ref.mean()
    vocal_wav = sources[-1]
    vocal_wav = vocal_wav / max(1.01 * vocal_wav.abs().max(), 1)
    vocal_wav = vocal_wav.numpy()
    vocal_wav = librosa.to_mono(vocal_wav)
    vocal_wav = vocal_wav.T
    instrumental_wav = sources[:-1].sum(0).numpy().T
    return vocal_wav, instrumental_wav

def download_youtube_clip(
    video_identifier,
    start_time,
    end_time,
    output_filename,
    num_attempts=5,
    url_base="https://www.youtube.com/watch?v=",
    quiet=False,
    force=False,
):
    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

def predict(
    speaker,
    audio,
    transpose: int = 0,
    auto_predict_f0: bool = False,
    cluster_infer_ratio: float = 0,
    noise_scale: float = 0.4,
    f0_method: str = "crepe",
    db_thresh: int = -40,
    pad_seconds: float = 0.5,
    chunk_seconds: float = 0.5,
    absolute_thresh: bool = False,
):
    model = models[speakers.index(speaker)]
    audio, _ = librosa.load(audio, sr=model.target_sample, duration=duration_limit)
    audio = model.infer_silence(
        audio.astype(np.float32),
        speaker=speaker,
        transpose=transpose,
        auto_predict_f0=auto_predict_f0,
        cluster_infer_ratio=cluster_infer_ratio,
        noise_scale=noise_scale,
        f0_method=f0_method,
        db_thresh=db_thresh,
        pad_seconds=pad_seconds,
        chunk_seconds=chunk_seconds,
        absolute_thresh=absolute_thresh,
    )
    return model.target_sample, audio


def predict_song_from_yt(
    ytid_or_url,
    start,
    end,
    speaker=speakers[0],
    transpose: int = 0,
    auto_predict_f0: bool = False,
    cluster_infer_ratio: float = 0,
    noise_scale: float = 0.4,
    f0_method: str = "dio",
    db_thresh: int = -40,
    pad_seconds: float = 0.5,
    chunk_seconds: float = 0.5,
    absolute_thresh: bool = False,
):
    model = models[speakers.index(speaker)]
    end = min(start + duration_limit, end)
    original_track_filepath = download_youtube_clip(
        ytid_or_url,
        start,
        end,
        "track.wav",
        force=True,
        url_base="" if ytid_or_url.startswith("http") else "https://www.youtube.com/watch?v=",
    )
    vox_wav, inst_wav = extract_vocal_demucs(demucs_model, original_track_filepath)
    if transpose != 0:
        inst_wav = librosa.effects.pitch_shift(inst_wav.T, sr=model.target_sample, n_steps=transpose).T
    cloned_vox = model.infer_silence(
        vox_wav.astype(np.float32),
        speaker=speaker,
        transpose=transpose,
        auto_predict_f0=auto_predict_f0,
        cluster_infer_ratio=cluster_infer_ratio,
        noise_scale=noise_scale,
        f0_method=f0_method,
        db_thresh=db_thresh,
        pad_seconds=pad_seconds,
        chunk_seconds=chunk_seconds,
        absolute_thresh=absolute_thresh,
    )
    full_song = inst_wav + np.expand_dims(cloned_vox, 1)
    return (model.target_sample, full_song), (model.target_sample, cloned_vox)



description = f"""
<center>💡 - 如何使用此程序：在页面上方选择“从B站视频上传”模块，填写视频网址和视频起止时间后，点击“submit”按键即可！您还可以点击页面最下方的示例快速预览效果</center>
""".strip()

article = """
<p style='text-align: 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。
</p>
""".strip()

interface_mic = gr.Interface(
    predict,
    inputs=[
        gr.Dropdown(speakers, value=speakers[0], label="🎤AI歌手选择🎶"),
        gr.Audio(type="filepath", source="microphone", label="请用麦克风上传您想转换的歌曲"),
        gr.Slider(-12, 12, value=0, step=1, label="变调 (默认为0；有正负值，+2为升高两个key)"),
        gr.Checkbox(False, label="是否开启自动f0预测", info="勾选即为开启；配合聚类模型f0预测效果更好，仅限语音转换时使用", visible=False),
        gr.Slider(0.0, 1.0, value=default_cluster_infer_ratio, step=0.1, label="聚类模型混合比例", info="0-1之间，0即不启用聚类。使用聚类模型能提升音色相似度，但会导致咬字下降 (如果使用，建议0.5左右)"),
        gr.Slider(0.0, 1.0, value=0.4, step=0.1, label="noise scale (建议保持不变)", visible=False),
        gr.Dropdown(
            choices=["crepe", "crepe-tiny", "parselmouth", "dio", "harvest"],
            value=default_f0_method,
            label="模型推理方法 (crepe推理效果最好)", visible=False
        ),
    ],
    outputs="audio",
    cache_examples=False,
    title="🌊💕🎶 - 滔滔AI+音乐：可从B站直接上传素材，无需分离背景音",
    description=description,
    article=article,
)
interface_file = gr.Interface(
    predict,
    inputs=[
        gr.Dropdown(speakers, value=speakers[0], label="🎤AI歌手选择🎶"),
        gr.Audio(type="filepath", source="upload", label="请上传您想转换的歌曲 (仅人声部分)"),
        gr.Slider(-12, 12, value=0, step=1, label="变调 (默认为0；有正负值，+2为升高两个key)"),
        gr.Checkbox(False, label="是否开启自动f0预测", info="勾选即为开启；配合聚类模型f0预测效果更好，仅限语音转换时使用", visible=False),
        gr.Slider(0.0, 1.0, value=default_cluster_infer_ratio, step=0.1, label="聚类模型混合比例", info="0-1之间，0即不启用聚类。使用聚类模型能提升音色相似度，但会导致咬字下降 (如果使用，建议0.5左右)"),
        gr.Slider(0.0, 1.0, value=0.4, step=0.1, label="noise scale (建议保持不变)", visible=False),
        gr.Dropdown(
            choices=["crepe", "crepe-tiny", "parselmouth", "dio", "harvest"],
            value=default_f0_method,
            label="模型推理方法 (crepe推理效果最好)", visible=False
        ),
    ],
    outputs="audio",
    cache_examples=False,
    title="🌊💕🎶 可从B站直接上传素材，无需分离背景音",
    description=description,
    article=article,
)
interface_yt = gr.Interface(
    predict_song_from_yt,
    inputs=[
        gr.Textbox(
            label="Bilibili网址", info="请填写含有您喜欢歌曲的Bilibili网址，可直接填写相应的BV号"
        ),
        gr.Number(value=0, label="起始时间 (秒)"),
        gr.Number(value=15, label="结束时间 (秒)"),
        gr.Dropdown(speakers, value=speakers[0], label="🎤AI歌手选择🎶"),
        gr.Slider(-12, 12, value=0, step=1, label="变调 (默认为0；有正负值，+2为升高两个key)"),
        gr.Checkbox(False, label="是否开启自动f0预测", info="勾选即为开启；配合聚类模型f0预测效果更好，仅限语音转换时使用", visible=False),
        gr.Slider(0.0, 1.0, value=default_cluster_infer_ratio, step=0.1, label="聚类模型混合比例", info="0-1之间，0即不启用聚类。使用聚类模型能提升音色相似度，但会导致咬字下降"),
        gr.Slider(0.0, 1.0, value=0.4, step=0.1, label="noise scale (建议保持不变)", visible=False),
        gr.Dropdown(
            choices=["crepe", "crepe-tiny", "parselmouth", "dio", "harvest"],
            value=default_f0_method,
            label="模型推理方法 (crepe推理效果最好)", visible=False
        ),
    ],
    outputs=[gr.Audio(label="AI歌手+伴奏🎵"), gr.Audio(label="AI歌手人声部分🎤")],
    title="🌊💕🎶 - 可从B站直接上传素材，无需分离背景音",
    description=description,
    article=article,
    cache_examples=False,
)
interface = gr.TabbedInterface(
    [interface_yt, interface_mic, interface_file],
    ["📺 - 从B站视频上传 ⭐推荐⭐", "🎙️ - 从麦克风上传", "🎵 - 从文件上传"],
)

if __name__ == "__main__":
    interface.launch(show_error=True)