import argparse
import numpy as np
import soundfile as sf
import os
from pathlib import Path
import paddle
import parakeet
from parakeet.models.waveflow import UpsampleNet, WaveFlow, ConditionalWaveFlow
from parakeet.utils import layer_tools, checkpoint


from config import get_cfg_defaults

def main(config, args):
    paddle.set_device(args.device)
    model = ConditionalWaveFlow.from_pretrained(config, args.checkpoint_path)
    layer_tools.recursively_remove_weight_norm(model)
    model.eval()

    mel_dir = Path(args.input).expanduser()
    output_dir = Path(args.output).expanduser()
    output_dir.mkdir(parents=True, exist_ok=True)
    for file_path in mel_dir.iterdir():
        mel = np.load(str(file_path))
        audio = model.predict(mel)
        audio_path = output_dir / (os.path.splitext(file_path.name)[0] + ".wav")
        sf.write(audio_path, audio, config.data.sample_rate)
        print("[synthesize] {} -> {}".format(file_path, audio_path))


if __name__ == "__main__":
    config = get_cfg_defaults()

    parser = argparse.ArgumentParser(description="generate mel spectrogram with TransformerTTS.")
    parser.add_argument("--config", type=str, metavar="FILE", help="extra config to overwrite the default config")
    parser.add_argument("--checkpoint_path", type=str, help="path of the checkpoint to load.")
    parser.add_argument("--input", type=str, help="path of directory containing mel spectrogram (in .npy format)")
    parser.add_argument("--output", type=str, help="path to save outputs")
    parser.add_argument("--device", type=str, default="cpu", help="device type to use.")
    parser.add_argument("--opts", nargs=argparse.REMAINDER, help="options to overwrite --config file and the default config, passing in KEY VALUE pairs")
    parser.add_argument("-v", "--verbose", action="store_true", help="print msg")
    
    args = parser.parse_args()
    if args.config: 
        config.merge_from_file(args.config)
    if args.opts:
        config.merge_from_list(args.opts)
    config.freeze()
    print(config)
    print(args)

    main(config, args)