import sys
import copy
import math
import torch
from torch import nn
from torch.nn import functional as F
from torch.nn import Conv1d, ConvTranspose1d, AvgPool1d, Conv2d
from torch.nn.utils import weight_norm, remove_weight_norm, spectral_norm


sys.path.append('../..')
import modules.commons as commons
import modules.modules as modules
import modules.attentions as attentions

from modules.commons import init_weights, get_padding

from modules.ddsp import mlp, gru, scale_function, remove_above_nyquist, upsample
from modules.ddsp import harmonic_synth, amp_to_impulse_response, fft_convolve
from modules.ddsp import resample
import utils

from modules.stft import TorchSTFT

import torch.distributions as D

from modules.losses import (
    generator_loss,
    discriminator_loss,
    feature_loss,
    kl_loss
)

LRELU_SLOPE = 0.1


class PostF0Decoder(nn.Module):
    def __init__(self, in_channels, filter_channels, kernel_size, p_dropout, spk_channels=0):
        super().__init__()

        self.in_channels = in_channels
        self.filter_channels = filter_channels
        self.kernel_size = kernel_size
        self.p_dropout = p_dropout
        self.gin_channels = spk_channels

        self.drop = nn.Dropout(p_dropout)
        self.conv_1 = nn.Conv1d(in_channels, filter_channels, kernel_size, padding=kernel_size // 2)
        self.norm_1 = modules.LayerNorm(filter_channels)
        self.conv_2 = nn.Conv1d(filter_channels, filter_channels, kernel_size, padding=kernel_size // 2)
        self.norm_2 = modules.LayerNorm(filter_channels)
        self.proj = nn.Conv1d(filter_channels, 1, 1)

        if spk_channels != 0:
            self.cond = nn.Conv1d(spk_channels, in_channels, 1)

    def forward(self, x, x_mask, g=None):
        x = torch.detach(x)
        if g is not None:
            g = torch.detach(g)
            x = x + self.cond(g)
        x = self.conv_1(x * x_mask)
        x = torch.relu(x)
        x = self.norm_1(x)
        x = self.drop(x)
        x = self.conv_2(x * x_mask)
        x = torch.relu(x)
        x = self.norm_2(x)
        x = self.drop(x)
        x = self.proj(x * x_mask)
        return x * x_mask


class TextEncoder(nn.Module):
    def __init__(self,
                 c_dim,
                 out_channels,
                 hidden_channels,
                 filter_channels,
                 n_heads,
                 n_layers,
                 kernel_size,
                 p_dropout):
        super().__init__()
        self.out_channels = out_channels
        self.hidden_channels = hidden_channels
        self.filter_channels = filter_channels
        self.n_heads = n_heads
        self.n_layers = n_layers
        self.kernel_size = kernel_size
        self.p_dropout = p_dropout

        self.pre_net = torch.nn.Linear(c_dim, hidden_channels)

        self.encoder = attentions.Encoder(
            hidden_channels,
            filter_channels,
            n_heads,
            n_layers,
            kernel_size,
            p_dropout)
        self.proj = nn.Conv1d(hidden_channels, out_channels, 1)

    def forward(self, x, x_lengths):
        x = x.transpose(1,-1)
        x = self.pre_net(x)
        x = torch.transpose(x, 1, -1)  # [b, h, t]
        x_mask = torch.unsqueeze(commons.sequence_mask(x_lengths, x.size(2)), 1).to(x.dtype)
        x = self.encoder(x * x_mask, x_mask)
        x = self.proj(x) * x_mask
        return x, x_mask


def pad_v2(input_ele, mel_max_length=None):
    if mel_max_length:
        max_len = mel_max_length
    else:
        max_len = max([input_ele[i].size(0) for i in range(len(input_ele))])

    out_list = list()
    for i, batch in enumerate(input_ele):
        if len(batch.shape) == 1:
            one_batch_padded = F.pad(
                batch, (0, max_len - batch.size(0)), "constant", 0.0
            )
        elif len(batch.shape) == 2:
            one_batch_padded = F.pad(
                batch, (0, 0, 0, max_len - batch.size(0)), "constant", 0.0
            )
        out_list.append(one_batch_padded)
    out_padded = torch.stack(out_list)
    return out_padded


class LengthRegulator(nn.Module):
    """ Length Regulator """

    def __init__(self):
        super(LengthRegulator, self).__init__()

    def LR(self, x, duration, max_len):
        x = torch.transpose(x, 1, 2)
        output = list()
        mel_len = list()
        for batch, expand_target in zip(x, duration):
            expanded = self.expand(batch, expand_target)
            output.append(expanded)
            mel_len.append(expanded.shape[0])

        if max_len is not None:
            output = pad_v2(output, max_len)
        else:
            output = pad_v2(output)
        output = torch.transpose(output, 1, 2)
        return output, torch.LongTensor(mel_len)

    def expand(self, batch, predicted):
        predicted = torch.squeeze(predicted)
        out = list()

        for i, vec in enumerate(batch):
            expand_size = predicted[i].item()
            state_info_index = torch.unsqueeze(torch.arange(0, expand_size), 1).float()
            state_info_length = torch.unsqueeze(torch.Tensor([expand_size] * expand_size), 1).float()
            state_info = torch.cat([state_info_index, state_info_length], 1).to(vec.device)
            new_vec = vec.expand(max(int(expand_size), 0), -1)
            new_vec = torch.cat([new_vec, state_info], 1)
            out.append(new_vec)
        out = torch.cat(out, 0)
        return out

    def forward(self, x, duration, max_len):
        output, mel_len = self.LR(x, duration, max_len)
        return output, mel_len


class PriorDecoder(nn.Module):
    def __init__(self,
                 out_bn_channels,
                 hidden_channels,
                 filter_channels,
                 n_heads,
                 n_layers,
                 kernel_size,
                 p_dropout,
                 n_speakers=0,
                 spk_channels=0):
        super().__init__()
        self.out_bn_channels = out_bn_channels
        self.hidden_channels = hidden_channels
        self.filter_channels = filter_channels
        self.n_heads = n_heads
        self.n_layers = n_layers
        self.kernel_size = kernel_size
        self.p_dropout = p_dropout
        self.spk_channels = spk_channels

        self.prenet = nn.Conv1d(hidden_channels , hidden_channels, 3, padding=1)
        self.decoder = attentions.FFT(
            hidden_channels,
            filter_channels,
            n_heads,
            n_layers,
            kernel_size,
            p_dropout)
        self.proj = nn.Conv1d(hidden_channels, out_bn_channels, 1)

        if n_speakers != 0:
            self.cond = nn.Conv1d(spk_channels, hidden_channels, 1)

    def forward(self, x, x_lengths, spk_emb=None):
        x_mask = torch.unsqueeze(commons.sequence_mask(x_lengths, x.size(2)), 1).to(x.dtype)

        x = self.prenet(x) * x_mask

        if (spk_emb is not None):
            x = x + self.cond(spk_emb)

        x = self.decoder(x * x_mask, x_mask)

        bn = self.proj(x) * x_mask

        return bn, x_mask


class Decoder(nn.Module):
    def __init__(self,
                 out_channels,
                 hidden_channels,
                 filter_channels,
                 n_heads,
                 n_layers,
                 kernel_size,
                 p_dropout,
                 n_speakers=0,
                 spk_channels=0,
                 in_channels=None):
        super().__init__()
        self.out_channels = out_channels
        self.hidden_channels = hidden_channels
        self.filter_channels = filter_channels
        self.n_heads = n_heads
        self.n_layers = n_layers
        self.kernel_size = kernel_size
        self.p_dropout = p_dropout
        self.spk_channels = spk_channels

        self.prenet = nn.Conv1d(in_channels if in_channels is not None else hidden_channels, hidden_channels, 3, padding=1)
        self.decoder = attentions.FFT(
            hidden_channels,
            filter_channels,
            n_heads,
            n_layers,
            kernel_size,
            p_dropout)
        self.proj = nn.Conv1d(hidden_channels, out_channels, 1)

        if n_speakers != 0:
            self.cond = nn.Conv1d(spk_channels, hidden_channels, 1)

    def forward(self, x, x_lengths, spk_emb=None):
        x = torch.detach(x)
        x_mask = torch.unsqueeze(commons.sequence_mask(x_lengths, x.size(2)), 1).to(x.dtype)

        x = self.prenet(x) * x_mask

        if (spk_emb is not None):
            x = x + self.cond(spk_emb)

        x = self.decoder(x * x_mask, x_mask)

        x = self.proj(x) * x_mask

        return x, x_mask

class F0Decoder(nn.Module):
    def __init__(self,
                 out_channels,
                 hidden_channels,
                 filter_channels,
                 n_heads,
                 n_layers,
                 kernel_size,
                 p_dropout,
                 n_speakers=0,
                 spk_channels=0,
                 in_channels=None):
        super().__init__()
        self.out_channels = out_channels
        self.hidden_channels = hidden_channels
        self.filter_channels = filter_channels
        self.n_heads = n_heads
        self.n_layers = n_layers
        self.kernel_size = kernel_size
        self.p_dropout = p_dropout
        self.spk_channels = spk_channels

        self.prenet = nn.Conv1d(in_channels if in_channels is not None else hidden_channels, hidden_channels, 3, padding=1)
        self.decoder = attentions.FFT(
            hidden_channels,
            filter_channels,
            n_heads,
            n_layers,
            kernel_size,
            p_dropout)
        self.proj = nn.Conv1d(hidden_channels, out_channels, 1)
        self.f0_prenet = nn.Conv1d(1, hidden_channels , 3, padding=1)

        if n_speakers != 0:
            self.cond = nn.Conv1d(spk_channels, hidden_channels, 1)

    def forward(self, x, norm_f0, x_lengths, spk_emb=None):
        x = torch.detach(x)
        x += self.f0_prenet(norm_f0)
        x_mask = torch.unsqueeze(commons.sequence_mask(x_lengths, x.size(2)), 1).to(x.dtype)

        x = self.prenet(x) * x_mask

        if (spk_emb is not None):
            x = x + self.cond(spk_emb)

        x = self.decoder(x * x_mask, x_mask)

        x = self.proj(x) * x_mask

        return x, x_mask


class ConvReluNorm(nn.Module):
    def __init__(self, in_channels, hidden_channels, out_channels, kernel_size, n_layers, p_dropout):
        super().__init__()
        self.in_channels = in_channels
        self.hidden_channels = hidden_channels
        self.out_channels = out_channels
        self.kernel_size = kernel_size
        self.n_layers = n_layers
        self.p_dropout = p_dropout
        assert n_layers > 1, "Number of layers should be larger than 0."

        self.conv_layers = nn.ModuleList()
        self.norm_layers = nn.ModuleList()
        self.conv_layers.append(nn.Conv1d(in_channels, hidden_channels, kernel_size, padding=kernel_size // 2))
        self.norm_layers.append(LayerNorm(hidden_channels))
        self.relu_drop = nn.Sequential(
            nn.ReLU(),
            nn.Dropout(p_dropout))
        for _ in range(n_layers - 1):
            self.conv_layers.append(nn.Conv1d(hidden_channels, hidden_channels, kernel_size, padding=kernel_size // 2))
            self.norm_layers.append(LayerNorm(hidden_channels))
        self.proj = nn.Conv1d(hidden_channels, out_channels, 1)
        self.proj.weight.data.zero_()
        self.proj.bias.data.zero_()

    def forward(self, x):
        x = self.conv_layers[0](x)
        x = self.norm_layers[0](x)
        x = self.relu_drop(x)

        for i in range(1, self.n_layers):
            x_ = self.conv_layers[i](x)
            x_ = self.norm_layers[i](x_)
            x_ = self.relu_drop(x_)
            x = (x + x_) / 2
        x = self.proj(x)
        return x


class PosteriorEncoder(nn.Module):
    def __init__(self,
                 hps,
                 in_channels,
                 out_channels,
                 hidden_channels,
                 kernel_size,
                 dilation_rate,
                 n_layers):
        super().__init__()
        self.in_channels = in_channels
        self.out_channels = out_channels
        self.hidden_channels = hidden_channels
        self.kernel_size = kernel_size
        self.dilation_rate = dilation_rate
        self.n_layers = n_layers

        self.pre = nn.Conv1d(in_channels, hidden_channels, 1)
        self.enc = modules.WN(hidden_channels, kernel_size, dilation_rate, n_layers, n_speakers=hps.data.n_speakers, spk_channels=hps.model.spk_channels)
        # self.enc = ConvReluNorm(hidden_channels,
        #                         hidden_channels,
        #                         hidden_channels,
        #                         kernel_size,
        #                         n_layers,
        #                         0.1)
        self.proj = nn.Conv1d(hidden_channels, out_channels * 2, 1)

    def forward(self, x, x_lengths, g=None):
        x_mask = torch.unsqueeze(commons.sequence_mask(x_lengths, x.size(2)), 1).to(x.dtype)
        x = self.pre(x) * x_mask
        x = self.enc(x, x_mask, g=g)
        stats = self.proj(x) * x_mask
        return stats, x_mask


class ResBlock3(torch.nn.Module):
    def __init__(self, channels, kernel_size=3, dilation=(1, 3)):
        super(ResBlock3, self).__init__()
        self.convs = nn.ModuleList([
            weight_norm(Conv1d(channels, channels, kernel_size, 1, dilation=dilation[0],
                               padding=get_padding(kernel_size, dilation[0])))
        ])
        self.convs.apply(init_weights)

    def forward(self, x, x_mask=None):
        for c in self.convs:
            xt = F.leaky_relu(x, LRELU_SLOPE)
            if x_mask is not None:
                xt = xt * x_mask
            xt = c(xt)
            x = xt + x
        if x_mask is not None:
            x = x * x_mask
        return x

    def remove_weight_norm(self):
        for l in self.convs:
            remove_weight_norm(l)


class Generator_Harm(torch.nn.Module):
    def __init__(self, hps):
        super(Generator_Harm, self).__init__()
        self.hps = hps

        self.prenet = Conv1d(hps.model.hidden_channels, hps.model.hidden_channels, 3, padding=1)

        self.net = ConvReluNorm(hps.model.hidden_channels,
                                hps.model.hidden_channels,
                                hps.model.hidden_channels,
                                hps.model.kernel_size,
                                8,
                                hps.model.p_dropout)

        # self.rnn = nn.LSTM(input_size=hps.model.hidden_channels,
        #    hidden_size=hps.model.hidden_channels,
        #    num_layers=1,
        #    bias=True,
        #    batch_first=True,
        #    dropout=0.5,
        #    bidirectional=True)
        self.postnet = Conv1d(hps.model.hidden_channels, hps.model.n_harmonic + 1, 3, padding=1)

    def forward(self, f0, harm, mask):
        pitch = f0.transpose(1, 2)
        harm = self.prenet(harm)

        harm = self.net(harm) * mask
        # harm = harm.transpose(1, 2)
        # harm, (hs, hc) = self.rnn(harm)
        # harm = harm.transpose(1, 2)

        harm = self.postnet(harm)
        harm = harm.transpose(1, 2)
        param = harm

        param = scale_function(param)
        total_amp = param[..., :1]
        amplitudes = param[..., 1:]
        amplitudes = remove_above_nyquist(
            amplitudes,
            pitch,
            self.hps.data.sampling_rate,
        )
        amplitudes /= amplitudes.sum(-1, keepdim=True)
        amplitudes *= total_amp

        amplitudes = upsample(amplitudes, self.hps.data.hop_length)
        pitch = upsample(pitch, self.hps.data.hop_length)

        n_harmonic = amplitudes.shape[-1]
        omega = torch.cumsum(2 * math.pi * pitch / self.hps.data.sampling_rate, 1)
        omegas = omega * torch.arange(1, n_harmonic + 1).to(omega)
        signal_harmonics = (torch.sin(omegas) * amplitudes)
        signal_harmonics = signal_harmonics.transpose(1, 2)
        return signal_harmonics


class Generator(torch.nn.Module):
    def __init__(self, hps, initial_channel, resblock, resblock_kernel_sizes, resblock_dilation_sizes, upsample_rates,
                 upsample_initial_channel, upsample_kernel_sizes, n_speakers=0, spk_channels=0):
        super(Generator, self).__init__()
        self.num_kernels = len(resblock_kernel_sizes)
        self.num_upsamples = len(upsample_rates)
        self.conv_pre = Conv1d(initial_channel, upsample_initial_channel, 7, 1, padding=3)
        self.upsample_rates = upsample_rates
        self.n_speakers = n_speakers

        resblock = modules.ResBlock1 if resblock == '1' else modules.R

        self.downs = nn.ModuleList()
        for i, (u, k) in enumerate(zip(upsample_rates, upsample_kernel_sizes)):
            i = len(upsample_rates) - 1 - i
            u = upsample_rates[i]
            k = upsample_kernel_sizes[i]
            # print("down: ",upsample_initial_channel//(2**(i+1))," -> ", upsample_initial_channel//(2**i))
            self.downs.append(weight_norm(
                Conv1d(hps.model.n_harmonic + 2, hps.model.n_harmonic + 2,
                       k, u, padding=k // 2)))

        self.resblocks_downs = nn.ModuleList()
        for i in range(len(self.downs)):
            j = len(upsample_rates) - 1 - i
            self.resblocks_downs.append(ResBlock3(hps.model.n_harmonic + 2, 3, (1, 3)))

        self.concat_pre = Conv1d(upsample_initial_channel + hps.model.n_harmonic + 2, upsample_initial_channel, 3, 1,
                                 padding=1)
        self.concat_conv = nn.ModuleList()
        for i in range(len(upsample_rates)):
            ch = upsample_initial_channel // (2 ** (i + 1))
            self.concat_conv.append(Conv1d(ch + hps.model.n_harmonic + 2, ch, 3, 1, padding=1, bias=False))

        self.ups = nn.ModuleList()
        for i, (u, k) in enumerate(zip(upsample_rates, upsample_kernel_sizes)):
            self.ups.append(weight_norm(
                ConvTranspose1d(upsample_initial_channel // (2 ** i), upsample_initial_channel // (2 ** (i + 1)),
                                k, u, padding=(k - u) // 2)))

        self.resblocks = nn.ModuleList()
        for i in range(len(self.ups)):
            ch = upsample_initial_channel // (2 ** (i + 1))
            for j, (k, d) in enumerate(zip(resblock_kernel_sizes, resblock_dilation_sizes)):
                self.resblocks.append(resblock(ch, k, d))

        self.conv_post = Conv1d(ch, 1, 7, 1, padding=3, bias=False)
        self.ups.apply(init_weights)

        if self.n_speakers != 0:
            self.cond = nn.Conv1d(spk_channels, upsample_initial_channel, 1)

    def forward(self, x, ddsp, g=None):

        x = self.conv_pre(x)

        if g is not None:
            x = x + self.cond(g)

        se = ddsp
        res_features = [se]
        for i in range(self.num_upsamples):
            in_size = se.size(2)
            se = self.downs[i](se)
            se = self.resblocks_downs[i](se)
            up_rate = self.upsample_rates[self.num_upsamples - 1 - i]
            se = se[:, :, : in_size // up_rate]
            res_features.append(se)

        x = torch.cat([x, se], 1)
        x = self.concat_pre(x)

        for i in range(self.num_upsamples):
            x = F.leaky_relu(x, modules.LRELU_SLOPE)
            in_size = x.size(2)
            x = self.ups[i](x)
            # 保证维度正确，丢掉多余通道
            x = x[:, :, : in_size * self.upsample_rates[i]]

            x = torch.cat([x, res_features[self.num_upsamples - 1 - i]], 1)
            x = self.concat_conv[i](x)

            xs = None
            for j in range(self.num_kernels):
                if xs is None:
                    xs = self.resblocks[i * self.num_kernels + j](x)
                else:
                    xs += self.resblocks[i * self.num_kernels + j](x)
            x = xs / self.num_kernels

        x = F.leaky_relu(x)
        x = self.conv_post(x)
        x = torch.tanh(x)

        return x

    def remove_weight_norm(self):
        print('Removing weight norm...')
        for l in self.ups:
            remove_weight_norm(l)
        for l in self.resblocks:
            l.remove_weight_norm()


class Generator_Noise(torch.nn.Module):
    def __init__(self, hps):
        super(Generator_Noise, self).__init__()
        self.hps = hps
        self.win_size = hps.data.win_size
        self.hop_size = hps.data.hop_length
        self.fft_size = hps.data.n_fft
        self.istft_pre = Conv1d(hps.model.hidden_channels, hps.model.hidden_channels, 3, padding=1)

        self.net = ConvReluNorm(hps.model.hidden_channels,
                                hps.model.hidden_channels,
                                hps.model.hidden_channels,
                                hps.model.kernel_size,
                                8,
                                hps.model.p_dropout)

        self.istft_amplitude = torch.nn.Conv1d(hps.model.hidden_channels, self.fft_size // 2 + 1, 1, 1)
        self.window = torch.hann_window(self.win_size)

    def forward(self, x, mask):
        istft_x = x
        istft_x = self.istft_pre(istft_x)

        istft_x = self.net(istft_x) * mask

        amp = self.istft_amplitude(istft_x).unsqueeze(-1)
        phase = (torch.rand(amp.shape) * 2 * 3.14 - 3.14).to(amp)

        real = amp * torch.cos(phase)
        imag = amp * torch.sin(phase)
        spec = torch.cat([real, imag], 3)
        istft_x = torch.istft(spec, self.fft_size, self.hop_size, self.win_size, self.window.to(amp), True,
                              length=x.shape[2] * self.hop_size, return_complex=False)

        return istft_x.unsqueeze(1)


class LayerNorm(nn.Module):
    def __init__(self, channels, eps=1e-5):
        super().__init__()
        self.channels = channels
        self.eps = eps

        self.gamma = nn.Parameter(torch.ones(channels))
        self.beta = nn.Parameter(torch.zeros(channels))

    def forward(self, x):
        x = x.transpose(1, -1)
        x = F.layer_norm(x, (self.channels,), self.gamma, self.beta, self.eps)
        return x.transpose(1, -1)


class DiscriminatorP(torch.nn.Module):
    def __init__(self, period, kernel_size=5, stride=3, use_spectral_norm=False):
        super(DiscriminatorP, self).__init__()
        self.period = period
        self.use_spectral_norm = use_spectral_norm
        norm_f = weight_norm if use_spectral_norm == False else spectral_norm
        self.convs = nn.ModuleList([
            norm_f(Conv2d(1, 32, (kernel_size, 1), (stride, 1), padding=(get_padding(kernel_size, 1), 0))),
            norm_f(Conv2d(32, 128, (kernel_size, 1), (stride, 1), padding=(get_padding(kernel_size, 1), 0))),
            norm_f(Conv2d(128, 512, (kernel_size, 1), (stride, 1), padding=(get_padding(kernel_size, 1), 0))),
            norm_f(Conv2d(512, 1024, (kernel_size, 1), (stride, 1), padding=(get_padding(kernel_size, 1), 0))),
            norm_f(Conv2d(1024, 1024, (kernel_size, 1), 1, padding=(get_padding(kernel_size, 1), 0))),
        ])
        self.conv_post = norm_f(Conv2d(1024, 1, (3, 1), 1, padding=(1, 0)))

    def forward(self, x):
        fmap = []

        # 1d to 2d
        b, c, t = x.shape
        if t % self.period != 0:  # pad first
            n_pad = self.period - (t % self.period)
            x = F.pad(x, (0, n_pad), "reflect")
            t = t + n_pad
        x = x.view(b, c, t // self.period, self.period)

        for l in self.convs:
            x = l(x)
            x = F.leaky_relu(x, modules.LRELU_SLOPE)
            fmap.append(x)
        x = self.conv_post(x)
        fmap.append(x)
        x = torch.flatten(x, 1, -1)

        return x, fmap


class DiscriminatorS(torch.nn.Module):
    def __init__(self, use_spectral_norm=False):
        super(DiscriminatorS, self).__init__()
        norm_f = weight_norm if use_spectral_norm == False else spectral_norm
        self.convs = nn.ModuleList([
            norm_f(Conv1d(1, 16, 15, 1, padding=7)),
            norm_f(Conv1d(16, 64, 41, 4, groups=4, padding=20)),
            norm_f(Conv1d(64, 256, 41, 4, groups=16, padding=20)),
            norm_f(Conv1d(256, 1024, 41, 4, groups=64, padding=20)),
            norm_f(Conv1d(1024, 1024, 41, 4, groups=256, padding=20)),
            norm_f(Conv1d(1024, 1024, 5, 1, padding=2)),
        ])
        self.conv_post = norm_f(Conv1d(1024, 1, 3, 1, padding=1))

    def forward(self, x):
        fmap = []

        for l in self.convs:
            x = l(x)
            x = F.leaky_relu(x, modules.LRELU_SLOPE)
            fmap.append(x)
        x = self.conv_post(x)
        fmap.append(x)
        x = torch.flatten(x, 1, -1)

        return x, fmap


class MultiFrequencyDiscriminator(nn.Module):
    def __init__(self,
                 hop_lengths=[128, 256, 512],
                 hidden_channels=[256, 512, 512],
                 domain='double', mel_scale=True):
        super(MultiFrequencyDiscriminator, self).__init__()

        self.stfts = nn.ModuleList([
            TorchSTFT(fft_size=x * 4, hop_size=x, win_size=x * 4,
                      normalized=True, domain=domain, mel_scale=mel_scale)
            for x in hop_lengths])

        self.domain = domain
        if domain == 'double':
            self.discriminators = nn.ModuleList([
                BaseFrequenceDiscriminator(2, c)
                for x, c in zip(hop_lengths, hidden_channels)])
        else:
            self.discriminators = nn.ModuleList([
                BaseFrequenceDiscriminator(1, c)
                for x, c in zip(hop_lengths, hidden_channels)])

    def forward(self, x):
        scores, feats = list(), list()
        for stft, layer in zip(self.stfts, self.discriminators):
            # print(stft)
            mag, phase = stft.transform(x.squeeze())
            if self.domain == 'double':
                mag = torch.stack(torch.chunk(mag, 2, dim=1), dim=1)
            else:
                mag = mag.unsqueeze(1)

            score, feat = layer(mag)
            scores.append(score)
            feats.append(feat)
        return scores, feats


class BaseFrequenceDiscriminator(nn.Module):
    def __init__(self, in_channels, hidden_channels=512):
        super(BaseFrequenceDiscriminator, self).__init__()

        self.discriminator = nn.ModuleList()
        self.discriminator += [
            nn.Sequential(
                nn.ReflectionPad2d((1, 1, 1, 1)),
                nn.utils.weight_norm(nn.Conv2d(
                    in_channels, hidden_channels // 32,
                    kernel_size=(3, 3), stride=(1, 1)))
            ),
            nn.Sequential(
                nn.LeakyReLU(0.2, True),
                nn.ReflectionPad2d((1, 1, 1, 1)),
                nn.utils.weight_norm(nn.Conv2d(
                    hidden_channels // 32, hidden_channels // 16,
                    kernel_size=(3, 3), stride=(2, 2)))
            ),
            nn.Sequential(
                nn.LeakyReLU(0.2, True),
                nn.ReflectionPad2d((1, 1, 1, 1)),
                nn.utils.weight_norm(nn.Conv2d(
                    hidden_channels // 16, hidden_channels // 8,
                    kernel_size=(3, 3), stride=(1, 1)))
            ),
            nn.Sequential(
                nn.LeakyReLU(0.2, True),
                nn.ReflectionPad2d((1, 1, 1, 1)),
                nn.utils.weight_norm(nn.Conv2d(
                    hidden_channels // 8, hidden_channels // 4,
                    kernel_size=(3, 3), stride=(2, 2)))
            ),
            nn.Sequential(
                nn.LeakyReLU(0.2, True),
                nn.ReflectionPad2d((1, 1, 1, 1)),
                nn.utils.weight_norm(nn.Conv2d(
                    hidden_channels // 4, hidden_channels // 2,
                    kernel_size=(3, 3), stride=(1, 1)))
            ),
            nn.Sequential(
                nn.LeakyReLU(0.2, True),
                nn.ReflectionPad2d((1, 1, 1, 1)),
                nn.utils.weight_norm(nn.Conv2d(
                    hidden_channels // 2, hidden_channels,
                    kernel_size=(3, 3), stride=(2, 2)))
            ),
            nn.Sequential(
                nn.LeakyReLU(0.2, True),
                nn.ReflectionPad2d((1, 1, 1, 1)),
                nn.utils.weight_norm(nn.Conv2d(
                    hidden_channels, 1,
                    kernel_size=(3, 3), stride=(1, 1)))
            )
        ]

    def forward(self, x):
        hiddens = []
        for layer in self.discriminator:
            x = layer(x)
            hiddens.append(x)
        return x, hiddens[-1]


class Discriminator(torch.nn.Module):
    def __init__(self, hps, use_spectral_norm=False):
        super(Discriminator, self).__init__()
        periods = [2, 3, 5, 7, 11]

        discs = [DiscriminatorS(use_spectral_norm=use_spectral_norm)]
        discs = discs + [DiscriminatorP(i, use_spectral_norm=use_spectral_norm) for i in periods]
        self.discriminators = nn.ModuleList(discs)
        # self.disc_multfrequency = MultiFrequencyDiscriminator(hop_lengths=[int(hps.data.sampling_rate * 2.5 / 1000),
        #                                                                    int(hps.data.sampling_rate * 5 / 1000),
        #                                                                    int(hps.data.sampling_rate * 7.5 / 1000),
        #                                                                    int(hps.data.sampling_rate * 10 / 1000),
        #                                                                    int(hps.data.sampling_rate * 12.5 / 1000),
        #                                                                    int(hps.data.sampling_rate * 15 / 1000)],
        #                                                       hidden_channels=[256, 256, 256, 256, 256])

    def forward(self, y, y_hat):
        y_d_rs = []
        y_d_gs = []
        fmap_rs = []
        fmap_gs = []
        for i, d in enumerate(self.discriminators):
            y_d_r, fmap_r = d(y)
            y_d_g, fmap_g = d(y_hat)
            y_d_rs.append(y_d_r)
            y_d_gs.append(y_d_g)
            fmap_rs.append(fmap_r)
            fmap_gs.append(fmap_g)
        # scores_r, fmaps_r = self.disc_multfrequency(y)
        # scores_g, fmaps_g = self.disc_multfrequency(y_hat)
        # for i in range(len(scores_r)):
        #     y_d_rs.append(scores_r[i])
        #     y_d_gs.append(scores_g[i])
        #     fmap_rs.append(fmaps_r[i])
        #     fmap_gs.append(fmaps_g[i])
        return y_d_rs, y_d_gs, fmap_rs, fmap_gs


class SynthesizerTrn(nn.Module):
    """
    Model
    """

    def __init__(self, hps):
        super().__init__()
        self.hps = hps

        self.text_encoder = TextEncoder(
            hps.data.c_dim,
            hps.model.prior_hidden_channels,
            hps.model.prior_hidden_channels,
            hps.model.prior_filter_channels,
            hps.model.prior_n_heads,
            hps.model.prior_n_layers,
            hps.model.prior_kernel_size,
            hps.model.prior_p_dropout)

        self.decoder = PriorDecoder(
            hps.model.hidden_channels * 2,
            hps.model.prior_hidden_channels,
            hps.model.prior_filter_channels,
            hps.model.prior_n_heads,
            hps.model.prior_n_layers,
            hps.model.prior_kernel_size,
            hps.model.prior_p_dropout,
            n_speakers=hps.data.n_speakers,
            spk_channels=hps.model.spk_channels
        )

        self.f0_decoder = F0Decoder(
            1,
            hps.model.prior_hidden_channels,
            hps.model.prior_filter_channels,
            hps.model.prior_n_heads,
            hps.model.prior_n_layers,
            hps.model.prior_kernel_size,
            hps.model.prior_p_dropout,
            n_speakers=hps.data.n_speakers,
            spk_channels=hps.model.spk_channels
        )

        self.mel_decoder = Decoder(
            hps.data.acoustic_dim,
            hps.model.prior_hidden_channels,
            hps.model.prior_filter_channels,
            hps.model.prior_n_heads,
            hps.model.prior_n_layers,
            hps.model.prior_kernel_size,
            hps.model.prior_p_dropout,
            n_speakers=hps.data.n_speakers,
            spk_channels=hps.model.spk_channels
        )

        self.posterior_encoder = PosteriorEncoder(
            hps,
            hps.data.acoustic_dim,
            hps.model.hidden_channels,
            hps.model.hidden_channels, 3, 1, 8)

        self.dropout = nn.Dropout(0.2)

        self.LR = LengthRegulator()

        self.dec = Generator(hps,
                             hps.model.hidden_channels,
                             hps.model.resblock,
                             hps.model.resblock_kernel_sizes,
                             hps.model.resblock_dilation_sizes,
                             hps.model.upsample_rates,
                             hps.model.upsample_initial_channel,
                             hps.model.upsample_kernel_sizes,
                             n_speakers=hps.data.n_speakers,
                             spk_channels=hps.model.spk_channels)

        self.dec_harm = Generator_Harm(hps)

        self.dec_noise = Generator_Noise(hps)

        self.f0_prenet = nn.Conv1d(1, hps.model.prior_hidden_channels , 3, padding=1)
        self.energy_prenet = nn.Conv1d(1, hps.model.prior_hidden_channels , 3, padding=1)
        self.mel_prenet = nn.Conv1d(hps.data.acoustic_dim, hps.model.prior_hidden_channels , 3, padding=1)

        if hps.data.n_speakers > 1:
            self.emb_spk = nn.Embedding(hps.data.n_speakers, hps.model.spk_channels)
        self.flow = modules.ResidualCouplingBlock(hps.model.prior_hidden_channels, hps.model.hidden_channels, 5, 1, 4,n_speakers=hps.data.n_speakers, gin_channels=hps.model.spk_channels)

    def forward(self, c, c_lengths, F0, uv, mel, bn_lengths, spk_id=None):
        if self.hps.data.n_speakers > 0:
            g = self.emb_spk(spk_id).unsqueeze(-1)  # [b, h, 1]
        else:
            g = None

        # Encoder
        decoder_input, x_mask = self.text_encoder(c, c_lengths)

        LF0 = 2595. * torch.log10(1. + F0 / 700.)
        LF0 = LF0 / 500
        norm_f0 = utils.normalize_f0(LF0,x_mask, uv.squeeze(1),random_scale=True)
        pred_lf0, predict_bn_mask = self.f0_decoder(decoder_input, norm_f0, bn_lengths, spk_emb=g)
        # print(pred_lf0)
        loss_f0 = F.mse_loss(pred_lf0, LF0)

        # aam
        predict_mel, predict_bn_mask = self.mel_decoder(decoder_input + self.f0_prenet(LF0), bn_lengths, spk_emb=g)

        predict_energy = predict_mel.detach().sum(1).unsqueeze(1) / self.hps.data.acoustic_dim

        decoder_input = decoder_input + \
                        self.f0_prenet(LF0) + \
                        self.energy_prenet(predict_energy) + \
                        self.mel_prenet(predict_mel.detach())
        decoder_output, predict_bn_mask = self.decoder(decoder_input, bn_lengths, spk_emb=g)

        prior_info = decoder_output
        m_p = prior_info[:, :self.hps.model.hidden_channels, :]
        logs_p = prior_info[:, self.hps.model.hidden_channels:, :]

        # posterior
        posterior, y_mask = self.posterior_encoder(mel, bn_lengths,g=g)

        m_q = posterior[:, :self.hps.model.hidden_channels, :]
        logs_q = posterior[:, self.hps.model.hidden_channels:, :]
        z = (m_q + torch.randn_like(m_q) * torch.exp(logs_q)) * y_mask
        z_p = self.flow(z, y_mask, g=g)

        # kl loss
        loss_kl = kl_loss(z_p, logs_q, m_p, logs_p, y_mask)

        p_z = z
        p_z = self.dropout(p_z)

        pitch = upsample(F0.transpose(1, 2), self.hps.data.hop_length)
        omega = torch.cumsum(2 * math.pi * pitch / self.hps.data.sampling_rate, 1)
        sin = torch.sin(omega).transpose(1, 2)

        # dsp synthesize
        noise_x = self.dec_noise(p_z, y_mask)
        harm_x = self.dec_harm(F0, p_z, y_mask)

        # dsp waveform
        dsp_o = torch.cat([harm_x, noise_x], axis=1)

        decoder_condition = torch.cat([harm_x, noise_x, sin], axis=1)

        # dsp based HiFiGAN vocoder
        x_slice, ids_slice = commons.rand_slice_segments(p_z, bn_lengths,
                                                         self.hps.train.segment_size // self.hps.data.hop_length)
        F0_slice = commons.slice_segments(F0, ids_slice, self.hps.train.segment_size // self.hps.data.hop_length)
        dsp_slice = commons.slice_segments(dsp_o, ids_slice * self.hps.data.hop_length, self.hps.train.segment_size)
        condition_slice = commons.slice_segments(decoder_condition, ids_slice * self.hps.data.hop_length,
                                                 self.hps.train.segment_size)
        o = self.dec(x_slice, condition_slice.detach(), g=g)

        return o, ids_slice, LF0 * predict_bn_mask, dsp_slice.sum(1), loss_kl, \
               predict_mel, predict_bn_mask, pred_lf0, loss_f0, norm_f0

    def infer(self, c, g=None, f0=None,uv=None, predict_f0=False, noice_scale=0.3):
        if len(g.shape) == 2:
            g = g.squeeze(0)
        if len(f0.shape) == 2:
            f0 = f0.unsqueeze(0)
        g = self.emb_spk(g).unsqueeze(-1)  # [b, h, 1]

        c_lengths = (torch.ones(c.size(0)) * c.size(-1)).to(c.device)

        # Encoder
        decoder_input, x_mask = self.text_encoder(c, c_lengths)
        y_lengths = c_lengths

        LF0 = 2595. * torch.log10(1. + f0 / 700.)
        LF0 = LF0 / 500

        if predict_f0:
            norm_f0 = utils.normalize_f0(LF0, x_mask, uv.squeeze(1))
            pred_lf0, predict_bn_mask = self.f0_decoder(decoder_input, norm_f0, y_lengths, spk_emb=g)
            pred_f0 = 700 * ( torch.pow(10, pred_lf0 * 500 / 2595) - 1)
            f0 = pred_f0
            LF0 = pred_lf0

        # aam
        predict_mel, predict_bn_mask = self.mel_decoder(decoder_input + self.f0_prenet(LF0), y_lengths, spk_emb=g)
        predict_energy = predict_mel.sum(1).unsqueeze(1) / self.hps.data.acoustic_dim

        decoder_input = decoder_input + \
                        self.f0_prenet(LF0) + \
                        self.energy_prenet(predict_energy) + \
                        self.mel_prenet(predict_mel)
        decoder_output, y_mask = self.decoder(decoder_input, y_lengths, spk_emb=g)

        prior_info = decoder_output

        m_p = prior_info[:, :self.hps.model.hidden_channels, :]
        logs_p = prior_info[:, self.hps.model.hidden_channels:, :]
        z_p = m_p + torch.randn_like(m_p) * torch.exp(logs_p) * noice_scale
        z = self.flow(z_p, y_mask, g=g, reverse=True)

        prior_z = z

        noise_x = self.dec_noise(prior_z, y_mask)

        harm_x = self.dec_harm(f0, prior_z, y_mask)

        pitch = upsample(f0.transpose(1, 2), self.hps.data.hop_length)
        omega = torch.cumsum(2 * math.pi * pitch / self.hps.data.sampling_rate, 1)
        sin = torch.sin(omega).transpose(1, 2)

        decoder_condition = torch.cat([harm_x, noise_x, sin], axis=1)

        # dsp based HiFiGAN vocoder
        o = self.dec(prior_z, decoder_condition, g=g)

        return o, harm_x.sum(1).unsqueeze(1), noise_x, f0