import soundfile as sf
import torch
import fire
import torch.nn.functional as F
from torchaudio.functional import resample
from models.ecapa_tdnn import ECAPA_TDNN_SMALL

MODEL_LIST = ['ecapa_tdnn', 'hubert_large', 'wav2vec2_xlsr', 'unispeech_sat']


def init_model(model_name, checkpoint=None):
    if model_name == 'unispeech_sat':
        config_path = 'config/unispeech_sat.th'
        model = ECAPA_TDNN_SMALL(feat_dim=1024, feat_type='unispeech_sat', config_path=config_path)
    elif model_name == 'hubert_large':
        config_path = None
        model = ECAPA_TDNN_SMALL(feat_dim=1024, feat_type='hubert_large_ll60k', config_path=config_path)
    elif model_name == 'wav2vec2_xlsr':
        config_path = None
        model = ECAPA_TDNN_SMALL(feat_dim=1024, feat_type='wav2vec2_xlsr', config_path=config_path)
    else:
        model = ECAPA_TDNN_SMALL(feat_dim=40, feat_type='fbank')

    if checkpoint is not None:
        state_dict = torch.load(checkpoint, map_location=lambda storage, loc: storage)
        model.load_state_dict(state_dict['model'], strict=False)
    return model


def verification(model_name,  wav1, wav2, use_gpu=True, checkpoint=None):

    assert model_name in MODEL_LIST, 'The model_name should be in {}'.format(MODEL_LIST)
    model = init_model(model_name, checkpoint)

    wav1, sr1 = sf.read(wav1)
    wav2, sr2 = sf.read(wav2)

    wav1 = torch.from_numpy(wav1).unsqueeze(0).float()
    wav2 = torch.from_numpy(wav2).unsqueeze(0).float()
    wav1 = resample(wav1, orig_freq=sr1, new_freq=16000)
    wav2 = resample(wav2, orig_freq=sr2, new_freq=16000)

    if use_gpu:
        model = model.cuda()
        wav1 = wav1.cuda()
        wav2 = wav2.cuda()

    model.eval()
    with torch.no_grad():
        emb1 = model(wav1)
        emb2 = model(wav2)

    sim = F.cosine_similarity(emb1, emb2)
    print("The similarity score between two audios is {:.4f} (-1.0, 1.0).".format(sim[0].item()))


if __name__ == "__main__":
    fire.Fire(verification)