import numpy as np 
from matplotlib import cm
import librosa
import os
import time
import tqdm
import argparse
from ruamel import yaml
import paddle
from paddle import fluid
from paddle.fluid import layers as F
from paddle.fluid import dygraph as dg
from paddle.fluid.io import DataLoader
import soundfile as sf

from parakeet.data import SliceDataset, DataCargo, PartialyRandomizedSimilarTimeLengthSampler, SequentialSampler
from parakeet.utils.io import save_parameters, load_parameters, add_yaml_config_to_args
from parakeet.g2p import en
from parakeet.models.deepvoice3.weight_norm_hook import remove_weight_norm
from vocoder import WaveflowVocoder, GriffinLimVocoder
from train import create_model


def main(args, config):
    model = create_model(config)
    loaded_step = load_parameters(model, checkpoint_path=args.checkpoint)
    for name, layer in model.named_sublayers():
        try:
            remove_weight_norm(layer)
        except ValueError:
            # this layer has not weight norm hook
            pass
    model.eval()
    if args.vocoder == "waveflow":
        vocoder = WaveflowVocoder()
        vocoder.model.eval()
    elif args.vocoder == "griffin-lim":
        vocoder = GriffinLimVocoder(
            sharpening_factor=config["sharpening_factor"], 
            sample_rate=config["sample_rate"],
            n_fft=config["n_fft"],
            win_length=config["win_length"],
            hop_length=config["hop_length"])
    else:
        raise ValueError("Other vocoders are not supported.")
    
    if not os.path.exists(args.output):
        os.makedirs(args.output)
    monotonic_layers = [int(item.strip()) - 1 for item in args.monotonic_layers.split(',')]
    with open(args.input, 'rt') as f:
        sentences = [line.strip() for line in f.readlines()]
    for i, sentence in enumerate(sentences):
        wav = synthesize(args, config, model, vocoder, sentence, monotonic_layers)
        sf.write(os.path.join(args.output, "sentence{}.wav".format(i)),
                 wav, samplerate=config["sample_rate"])


def synthesize(args, config, model, vocoder, sentence, monotonic_layers):
    print("[synthesize] {}".format(sentence))
    text = en.text_to_sequence(sentence, p=1.0)
    text = np.expand_dims(np.array(text, dtype="int64"), 0)
    lengths = np.array([text.size], dtype=np.int64)
    text_seqs = dg.to_variable(text)
    text_lengths = dg.to_variable(lengths)

    decoder_layers = config["decoder_layers"]
    force_monotonic_attention = [False] * decoder_layers
    for i in monotonic_layers:
        force_monotonic_attention[i] = True
    
    with dg.no_grad():
        outputs = model(text_seqs, text_lengths, speakers=None,
            force_monotonic_attention=force_monotonic_attention, 
            window=(config["backward_step"], config["forward_step"]))
        decoded, refined, attentions = outputs
        if args.vocoder == "griffin-lim":
            wav_np = vocoder(refined.numpy()[0].T)
        else:
            wav = vocoder(F.transpose(refined, (0, 2, 1)))
            wav_np = wav.numpy()[0]
    return wav_np




if __name__ == "__main__":
    import argparse
    from ruamel import yaml
    parser = argparse.ArgumentParser("synthesize from a checkpoint")
    parser.add_argument("--config", type=str, required=True, help="config file")
    parser.add_argument("--input", type=str, required=True, help="text file to synthesize")
    parser.add_argument("--output", type=str, required=True, help="path to save audio")
    parser.add_argument("--checkpoint", type=str, required=True, help="data path of the checkpoint")
    parser.add_argument("--monotonic_layers", type=str, required=True, help="monotonic decoder layers' indices(start from 1)")
    parser.add_argument("--vocoder", type=str, default="waveflow", choices=['griffin-lim', 'waveflow'], help="vocoder to use")
    args = parser.parse_args()
    with open(args.config, 'rt') as f:
        config = yaml.safe_load(f)
    
    dg.enable_dygraph(fluid.CUDAPlace(0))
    main(args, config)