import numpy as np
from pyannote.audio import Model
from pyannote.audio import Inference

import math
import multiprocessing
from random import shuffle
import torch.multiprocessing as mp

import torch
from glob import glob

from tqdm import tqdm

import logging

from data_conf import data_root

logging.getLogger("numba").setLevel(logging.WARNING)


def process_one(file_path, inference, device):
    spk_emb_path = file_path.replace(".wav", ".spk.npy").replace(".mp3", ".spk.npy")
    try:
        np.load(spk_emb_path)
    except:

        embedding = inference(file_path)
        np.save(spk_emb_path, embedding)
    np.save(spk_emb_path, embedding)


def process_batch(filenames):
    print("Loading models ...")
    process_idx = mp.current_process()._identity
    rank = process_idx[0] if len(process_idx) > 0 else 0
    gpu_id = rank % torch.cuda.device_count()
    device = torch.device(f"cuda:{gpu_id}")
    print(device)

    model = Model.from_pretrained("pyannote/wespeaker-voxceleb-resnet34-LM")
    model = model.to(device)
    inference = Inference(model, window="whole")

    print("Loaded .")
    with torch.no_grad():
        for filename in tqdm(filenames):
            process_one(filename, inference, device)


in_dir = data_root

if __name__ == "__main__":
    filenames = glob(f"{in_dir}/**/*.wav", recursive=True)  # [:10]
    filenames += glob(f"{in_dir}/**/*.mp3", recursive=True)  # [:10]
    shuffle(filenames)
    multiprocessing.set_start_method("spawn", force=True)

    num_processes = 1
    chunk_size = int(math.ceil(len(filenames) / num_processes))
    chunks = [
        filenames[i: i + chunk_size] for i in range(0, len(filenames), chunk_size)
    ]
    print([len(c) for c in chunks])
    processes = [
        multiprocessing.Process(target=process_batch, args=(chunk,)) for chunk in chunks
    ]
    for p in processes:
        p.start()

    for p in processes:
        p.join()