# Copyright (c) 2024 Alibaba Inc (authors: Xiang Lyu, Kai Hu)
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""HIFI-GAN"""

import typing as tp
import time
import numpy as np
from scipy.signal import get_window
import torch
import torch.nn as nn
import torch.nn.functional as F
from torch.nn import Conv1d
from torch.nn import ConvTranspose1d
from torch.nn.utils import remove_weight_norm
from torch.nn.utils import weight_norm
from torch.distributions.uniform import Uniform

from cosyvoice.transformer.activation import Snake
from cosyvoice.utils.common import get_padding
from cosyvoice.utils.common import init_weights


"""hifigan based generator implementation.

This code is modified from https://github.com/jik876/hifi-gan
 ,https://github.com/kan-bayashi/ParallelWaveGAN and
 https://github.com/NVIDIA/BigVGAN

"""


class ResBlock(torch.nn.Module):
    """Residual block module in HiFiGAN/BigVGAN."""

    def __init__(
        self,
        channels: int = 512,
        kernel_size: int = 3,
        dilations: tp.List[int] = [1, 3, 5],
    ):
        super(ResBlock, self).__init__()
        self.convs1 = nn.ModuleList()
        self.convs2 = nn.ModuleList()

        for dilation in dilations:
            self.convs1.append(
                weight_norm(
                    Conv1d(
                        channels,
                        channels,
                        kernel_size,
                        1,
                        dilation=dilation,
                        padding=get_padding(kernel_size, dilation),
                    )
                )
            )
            self.convs2.append(
                weight_norm(
                    Conv1d(
                        channels,
                        channels,
                        kernel_size,
                        1,
                        dilation=1,
                        padding=get_padding(kernel_size, 1),
                    )
                )
            )
        self.convs1.apply(init_weights)
        self.convs2.apply(init_weights)
        self.activations1 = nn.ModuleList(
            [Snake(channels, alpha_logscale=False) for _ in range(len(self.convs1))]
        )
        self.activations2 = nn.ModuleList(
            [Snake(channels, alpha_logscale=False) for _ in range(len(self.convs2))]
        )

    def forward(self, x: torch.Tensor) -> torch.Tensor:
        for idx in range(len(self.convs1)):
            xt = self.activations1[idx](x)
            xt = self.convs1[idx](xt)
            xt = self.activations2[idx](xt)
            xt = self.convs2[idx](xt)
            x = xt + x
        return x

    def remove_weight_norm(self):
        for idx in range(len(self.convs1)):
            remove_weight_norm(self.convs1[idx])
            remove_weight_norm(self.convs2[idx])


class SineGen(torch.nn.Module):
    """Definition of sine generator
    SineGen(samp_rate, harmonic_num = 0,
            sine_amp = 0.1, noise_std = 0.003,
            voiced_threshold = 0,
            flag_for_pulse=False)
    samp_rate: sampling rate in Hz
    harmonic_num: number of harmonic overtones (default 0)
    sine_amp: amplitude of sine-wavefrom (default 0.1)
    noise_std: std of Gaussian noise (default 0.003)
    voiced_thoreshold: F0 threshold for U/V classification (default 0)
    flag_for_pulse: this SinGen is used inside PulseGen (default False)
    Note: when flag_for_pulse is True, the first time step of a voiced
        segment is always sin(np.pi) or cos(0)
    """

    def __init__(
        self,
        samp_rate,
        harmonic_num=0,
        sine_amp=0.1,
        noise_std=0.003,
        voiced_threshold=0,
    ):
        super(SineGen, self).__init__()
        self.sine_amp = sine_amp
        self.noise_std = noise_std
        self.harmonic_num = harmonic_num
        self.sampling_rate = samp_rate
        self.voiced_threshold = voiced_threshold

    def _f02uv(self, f0):
        # generate uv signal
        uv = (f0 > self.voiced_threshold).type(torch.float32)
        return uv

    @torch.no_grad()
    def forward(self, f0):
        """
        :param f0: [B, 1, sample_len], Hz
        :return: [B, 1, sample_len]
        """

        F_mat = torch.zeros((f0.size(0), self.harmonic_num + 1, f0.size(-1))).to(
            f0.device
        )
        for i in range(self.harmonic_num + 1):
            F_mat[:, i : i + 1, :] = f0 * (i + 1) / self.sampling_rate

        theta_mat = 2 * np.pi * (torch.cumsum(F_mat, dim=-1) % 1)
        u_dist = Uniform(low=-np.pi, high=np.pi)
        phase_vec = u_dist.sample(
            sample_shape=(f0.size(0), self.harmonic_num + 1, 1)
        ).to(F_mat.device)
        phase_vec[:, 0, :] = 0

        # generate sine waveforms
        sine_waves = self.sine_amp * torch.sin(theta_mat + phase_vec)

        # generate uv signal
        uv = self._f02uv(f0)

        # noise: for unvoiced should be similar to sine_amp
        #        std = self.sine_amp/3 -> max value ~ self.sine_amp
        # .       for voiced regions is self.noise_std
        noise_amp = uv * self.noise_std + (1 - uv) * self.sine_amp / 3
        noise = noise_amp * torch.randn_like(sine_waves)

        # first: set the unvoiced part to 0 by uv
        # then: additive noise
        sine_waves = sine_waves * uv + noise
        return sine_waves, uv, noise


class SourceModuleHnNSF(torch.nn.Module):
    """SourceModule for hn-nsf
    SourceModule(sampling_rate, harmonic_num=0, sine_amp=0.1,
                 add_noise_std=0.003, voiced_threshod=0)
    sampling_rate: sampling_rate in Hz
    harmonic_num: number of harmonic above F0 (default: 0)
    sine_amp: amplitude of sine source signal (default: 0.1)
    add_noise_std: std of additive Gaussian noise (default: 0.003)
        note that amplitude of noise in unvoiced is decided
        by sine_amp
    voiced_threshold: threhold to set U/V given F0 (default: 0)
    Sine_source, noise_source = SourceModuleHnNSF(F0_sampled)
    F0_sampled (batchsize, length, 1)
    Sine_source (batchsize, length, 1)
    noise_source (batchsize, length 1)
    uv (batchsize, length, 1)
    """

    def __init__(
        self,
        sampling_rate,
        upsample_scale,
        harmonic_num=0,
        sine_amp=0.1,
        add_noise_std=0.003,
        voiced_threshod=0,
    ):
        super(SourceModuleHnNSF, self).__init__()

        self.sine_amp = sine_amp
        self.noise_std = add_noise_std

        # to produce sine waveforms
        self.l_sin_gen = SineGen(
            sampling_rate, harmonic_num, sine_amp, add_noise_std, voiced_threshod
        )

        # to merge source harmonics into a single excitation
        self.l_linear = torch.nn.Linear(harmonic_num + 1, 1)
        self.l_tanh = torch.nn.Tanh()

    def forward(self, x):
        """
        Sine_source, noise_source = SourceModuleHnNSF(F0_sampled)
        F0_sampled (batchsize, length, 1)
        Sine_source (batchsize, length, 1)
        noise_source (batchsize, length 1)
        """
        # source for harmonic branch
        with torch.no_grad():
            sine_wavs, uv, _ = self.l_sin_gen(x.transpose(1, 2))
            sine_wavs = sine_wavs.transpose(1, 2)
            uv = uv.transpose(1, 2)
        sine_merge = self.l_tanh(self.l_linear(sine_wavs))

        # source for noise branch, in the same shape as uv
        noise = torch.randn_like(uv) * self.sine_amp / 3
        return sine_merge, noise, uv


class HiFTGenerator(nn.Module):
    """
    HiFTNet Generator: Neural Source Filter + ISTFTNet
    https://arxiv.org/abs/2309.09493
    """

    def __init__(
        self,
        in_channels: int = 80,
        base_channels: int = 512,
        nb_harmonics: int = 8,
        sampling_rate: int = 22050,
        nsf_alpha: float = 0.1,
        nsf_sigma: float = 0.003,
        nsf_voiced_threshold: float = 10,
        upsample_rates: tp.List[int] = [8, 8],
        upsample_kernel_sizes: tp.List[int] = [16, 16],
        istft_params: tp.Dict[str, int] = {"n_fft": 16, "hop_len": 4},
        resblock_kernel_sizes: tp.List[int] = [3, 7, 11],
        resblock_dilation_sizes: tp.List[tp.List[int]] = [
            [1, 3, 5],
            [1, 3, 5],
            [1, 3, 5],
        ],
        source_resblock_kernel_sizes: tp.List[int] = [7, 11],
        source_resblock_dilation_sizes: tp.List[tp.List[int]] = [[1, 3, 5], [1, 3, 5]],
        lrelu_slope: float = 0.1,
        audio_limit: float = 0.99,
        f0_predictor: torch.nn.Module = None,
    ):
        super(HiFTGenerator, self).__init__()

        self.out_channels = 1
        self.nb_harmonics = nb_harmonics
        self.sampling_rate = sampling_rate
        self.istft_params = istft_params
        self.lrelu_slope = lrelu_slope
        self.audio_limit = audio_limit

        self.num_kernels = len(resblock_kernel_sizes)
        self.num_upsamples = len(upsample_rates)
        self.upsample_rates = upsample_rates
        self.m_source = SourceModuleHnNSF(
            sampling_rate=sampling_rate,
            upsample_scale=np.prod(upsample_rates) * istft_params["hop_len"],
            harmonic_num=nb_harmonics,
            sine_amp=nsf_alpha,
            add_noise_std=nsf_sigma,
            voiced_threshod=nsf_voiced_threshold,
        )
        self.f0_upsamp = torch.nn.Upsample(
            scale_factor=np.prod(upsample_rates) * istft_params["hop_len"]
        )

        self.conv_pre = weight_norm(Conv1d(in_channels, base_channels, 7, 1, padding=3))

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

        # Down
        self.source_downs = nn.ModuleList()
        self.source_resblocks = nn.ModuleList()
        downsample_rates = [1] + upsample_rates[::-1][:-1]
        downsample_cum_rates = np.cumprod(downsample_rates)
        for i, (u, k, d) in enumerate(
            zip(
                downsample_cum_rates[::-1],
                source_resblock_kernel_sizes,
                source_resblock_dilation_sizes,
            )
        ):
            if u == 1:
                self.source_downs.append(
                    Conv1d(
                        istft_params["n_fft"] + 2, base_channels // (2 ** (i + 1)), 1, 1
                    )
                )
            else:
                self.source_downs.append(
                    Conv1d(
                        istft_params["n_fft"] + 2,
                        base_channels // (2 ** (i + 1)),
                        u * 2,
                        u,
                        padding=(u // 2),
                    )
                )

            self.source_resblocks.append(
                ResBlock(base_channels // (2 ** (i + 1)), k, d)
            )

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

        self.conv_post = weight_norm(
            Conv1d(ch, istft_params["n_fft"] + 2, 7, 1, padding=3)
        )
        self.ups.apply(init_weights)
        self.conv_post.apply(init_weights)
        self.reflection_pad = nn.ReflectionPad1d((1, 0))
        self.stft_window = torch.from_numpy(
            get_window("hann", istft_params["n_fft"], fftbins=True).astype(np.float32)
        ).cuda()
        self.f0_predictor = f0_predictor
        self.inference_buffers = {}
        self.inference_graphs = {}

    def _f02source(self, f0: torch.Tensor) -> torch.Tensor:
        f0 = self.f0_upsamp(f0[:, None]).transpose(1, 2)  # bs,n,t

        har_source, _, _ = self.m_source(f0)
        return har_source.transpose(1, 2)

    def _stft(self, x):
        spec = torch.stft(
            x,
            self.istft_params["n_fft"],
            self.istft_params["hop_len"],
            self.istft_params["n_fft"],
            window=self.stft_window,
            return_complex=True,
        )
        spec = torch.view_as_real(spec)  # [B, F, TT, 2]
        return spec[..., 0], spec[..., 1]

    def _istft(self, magnitude, phase):
        magnitude = torch.clip(magnitude, max=1e2)
        real = magnitude * torch.cos(phase)
        img = magnitude * torch.sin(phase)
        inverse_transform = torch.istft(
            torch.complex(real, img),
            self.istft_params["n_fft"],
            self.istft_params["hop_len"],
            self.istft_params["n_fft"],
            window=self.stft_window,
        )
        return inverse_transform

    def forward(
        self, x: torch.Tensor, cache_source: torch.Tensor = torch.zeros(1, 1, 0)
    ) -> torch.Tensor:
        f0 = self.f0_predictor(x)
        s = self._f02source(f0)

        # use cache_source to avoid glitch
        if cache_source.shape[2] != 0:
            s[:, :, : cache_source.shape[2]] = cache_source

        s_stft_real, s_stft_imag = self._stft(s.squeeze(1))
        s_stft = torch.cat([s_stft_real, s_stft_imag], dim=1)

        x = self.conv_pre(x)
        for i in range(self.num_upsamples):
            x = F.leaky_relu(x, self.lrelu_slope)
            x = self.ups[i](x)

            if i == self.num_upsamples - 1:
                x = self.reflection_pad(x)

            # fusion
            si = self.source_downs[i](s_stft)
            si = self.source_resblocks[i](si)
            x = x + si

            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)
        magnitude = torch.exp(x[:, : self.istft_params["n_fft"] // 2 + 1, :])
        phase = torch.sin(
            x[:, self.istft_params["n_fft"] // 2 + 1 :, :]
        )  # actually, sin is redundancy

        x = self._istft(magnitude, phase)
        x = torch.clamp(x, -self.audio_limit, self.audio_limit)
        return x, s

    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()
        remove_weight_norm(self.conv_pre)
        remove_weight_norm(self.conv_post)
        self.source_module.remove_weight_norm()
        for l in self.source_downs:
            remove_weight_norm(l)
        for l in self.source_resblocks:
            l.remove_weight_norm()

    @torch.inference_mode()
    def _inference_impl(self, mel: torch.Tensor, s_stft: torch.Tensor) -> torch.Tensor:
        x = self.conv_pre(mel)
        for i in range(self.num_upsamples):
            x = F.leaky_relu(x, self.lrelu_slope)
            x = self.ups[i](x)

            if i == self.num_upsamples - 1:
                x = self.reflection_pad(x)

            # fusion
            si = self.source_downs[i](s_stft)
            si = self.source_resblocks[i](si)
            x = x + si

            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)
        magnitude = torch.exp(x[:, : self.istft_params["n_fft"] // 2 + 1, :])
        phase = torch.sin(
            x[:, self.istft_params["n_fft"] // 2 + 1 :, :]
        )  # actually, sin is redundancy
        # print(f"mel: {mel.shape}, magnitude: {magnitude.shape}, phase: {phase.shape}")
        return magnitude, phase

    @torch.inference_mode()
    def inference(
        self, mel: torch.Tensor, cache_source: torch.Tensor = torch.zeros(1, 1, 0)
    ) -> torch.Tensor:
        curr_seq_len = mel.shape[2]
        f0 = self.f0_predictor(mel)
        s = self._f02source(f0)
        s_stft_real, s_stft_imag = self._stft(s.squeeze(1))
        s_stft = torch.cat([s_stft_real, s_stft_imag], dim=1)

        target_len = None
        for seq_len in sorted(self.inference_buffers.keys()):
            if curr_seq_len <= seq_len:
                target_len = seq_len
                break

        if target_len is not None:
            buffer = self.inference_buffers[target_len]

            if curr_seq_len < target_len:
                padded_mel = torch.zeros_like(buffer["mel"])
                padded_mel[:, :, :curr_seq_len] = mel
                buffer["mel"].copy_(padded_mel)
                padded_s_stft = torch.zeros_like(buffer["s_stft"])
                cur_s_stft_len = s_stft.shape[2]
                padded_s_stft[:, :, :cur_s_stft_len] = s_stft
                buffer["s_stft"].copy_(padded_s_stft)

            else:
                buffer["mel"].copy_(mel)
                buffer["s_stft"].copy_(s_stft)
                cur_s_stft_len = s_stft.shape[2]

            self.inference_graphs[target_len].replay()

            magnitude, phase = (
                buffer["magnitude"][:, :, :cur_s_stft_len],
                buffer["phase"][:, :, :cur_s_stft_len],
            )
        else:
            magnitude, phase = self._inference_impl(mel=mel, s_stft=s_stft)

        x = self._istft(magnitude, phase)
        x = torch.clamp(x, -self.audio_limit, self.audio_limit)
        return x, s

    @torch.inference_mode()
    def capture_inference(self, seq_len_to_capture=[64, 128, 256, 512, 1024]):
        start_time = time.time()
        print(
            f"capture inference for HiFTGenerator with seq_len_to_capture: {seq_len_to_capture}"
        )
        for seq_len in seq_len_to_capture:
            mel = torch.randn(
                1, 80, seq_len, device=torch.device("cuda"), dtype=torch.float32
            )
            f0 = self.f0_predictor(mel)
            s = self._f02source(f0)
            s_stft_real, s_stft_imag = self._stft(s.squeeze(1))
            s_stft = torch.cat([s_stft_real, s_stft_imag], dim=1)

            magnitude, phase = self._inference_impl(mel=mel, s_stft=s_stft)
            torch.cuda.synchronize()

            g = torch.cuda.CUDAGraph()
            with torch.cuda.graph(g):
                magnitude, phase = self._inference_impl(mel=mel, s_stft=s_stft)
            inference_buffer = {
                "mel": mel,
                "s_stft": s_stft,
                "magnitude": magnitude,
                "phase": phase,
            }
            self.inference_buffers[seq_len] = inference_buffer
            self.inference_graphs[seq_len] = g

        end_time = time.time()
        print(
            f"capture inference for HiFTGenerator with seq_len_to_capture: {seq_len_to_capture} takes {end_time - start_time} seconds"
        )