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import torch

from fastpitch.data_function import TextMelAliCollate, TextMelAliLoader, batch_to_gpu as batch_to_gpu_fastpitch
from tacotron2.data_function import batch_to_gpu as batch_to_gpu_tacotron2
from tacotron2.data_function import TextMelCollate, TextMelLoader
from waveglow.data_function import batch_to_gpu as batch_to_gpu_waveglow
from waveglow.data_function import MelAudioLoader


def get_collate_function(model_name):
    return {
        "Tacotron2": lambda _: TextMelCollate(n_frames_per_step=1),
        "WaveGlow": lambda _: torch.utils.data.dataloader.default_collate,
        "FastPitch": TextMelAliCollate,
    }[model_name]()


def get_data_loader(model_name, **args):
    return {"Tacotron2": TextMelLoader, "WaveGlow": MelAudioLoader, "FastPitch": TextMelAliLoader}[model_name](**args)


def get_batch_to_gpu(model_name):
    return {
        "Tacotron2": batch_to_gpu_tacotron2,
        "WaveGlow": batch_to_gpu_waveglow,
        "FastPitch": batch_to_gpu_fastpitch,
    }[model_name]