from typing import Optional

import numpy as np
import torch
from torch import Tensor, tensor

from torchsynth.config import SynthConfig
from torchsynth.module import (
    ADSR,
    VCA,
    AudioMixer,
    ControlRateUpsample,
    MonophonicKeyboard,
    SineVCO,
    SquareSawVCO,
    VCO, LFO, ModulationMixer,
)
from torchsynth.signal import Signal
from torchsynth.synth import AbstractSynth

# from configurations.read_configuration import get_conf_sample_rate
from melody_synth.non_random_LFOs import SinLFO, SawLFO, TriLFO, SquareLFO, RSawLFO


class TriangleVCO(VCO):
    """This is an expanded module that inherits VCO producing Triangle waves."""

    def oscillator(self, argument: Signal, midi_f0: Tensor) -> Signal:
        return torch.arcsin(torch.sin(argument * 2)) * 2.0 / torch.pi


class AmpModTorchSynth(AbstractSynth):
    """This is an abstract class using the modules provided by 1B1Synth to assemble synthesizers that generate the
    training set. (The implementation of this class references code in TorchSynth) """

    def __init__(
            self,
            synthconfig: Optional[SynthConfig] = None,
            nebula: Optional[str] = "nebula",
            *args,
            **kwargs,
    ):
        AbstractSynth.__init__(self, synthconfig=synthconfig, *args, **kwargs)
        self.share_modules = [
            ("keyboard", MonophonicKeyboard),
            ("adsr_1", ADSR),
            ("adsr_2", ADSR),
            ("upsample", ControlRateUpsample),
            ("vca", VCA),
            ("lfo_amp_sin", SinLFO),
            ("lfo_pitch_sin_1", SinLFO),
            ("lfo_pitch_sin_2", SinLFO),
            (
                "mixer",
                AudioMixer,
                {
                    "n_input": 2,
                    "curves": [1.0, 1.0],
                    "names": ["vco_1", "vco_2"],
                },
            )
        ]

    def output(self) -> Tensor:
        """Synthesizes the signal as Tensor"""

        midi_f0, note_on_duration = self.keyboard()
        adsr1 = self.adsr_1(note_on_duration)
        adsr1 = self.upsample(adsr1)

        adsr2 = self.adsr_2(note_on_duration)
        adsr2 = self.upsample(adsr2)

        amp_modulation = self.lfo_amp_sin()
        amp_modulation = self.upsample(amp_modulation)

        pitch_modulation_1 = self.lfo_pitch_sin_1()
        pitch_modulation_1 = self.upsample(pitch_modulation_1)
        pitch_modulation_2 = self.lfo_pitch_sin_2()
        pitch_modulation_2 = self.upsample(pitch_modulation_2)

        vco_amp1 = adsr1 * (amp_modulation * 0.5 + 0.5)
        vco_amp2 = adsr2 * (amp_modulation * 0.5 + 0.5)
        vco_1_out = self.vco_1(midi_f0, pitch_modulation_1)
        vco_1_out = self.vca(vco_1_out, vco_amp1)

        vco_2_out = self.vco_2(midi_f0, pitch_modulation_2)
        vco_2_out = self.vca(vco_2_out, vco_amp2)

        return self.mixer(vco_1_out, vco_2_out)

    def get_signal(self, amp_mod_depth, amp_waveform, duration_l, amp1, amp2):
        """Synthesizes the signal as Tensor"""

        midi_f0, note_on_duration = self.keyboard()
        adsr1 = self.adsr_1(note_on_duration)
        adsr1 = self.upsample(adsr1)

        adsr2 = self.adsr_2(note_on_duration)
        adsr2 = self.upsample(adsr2)

        amp_modulation = self.lfo_amp_sin()
        amp_modulation = self.upsample(amp_modulation)

        pitch_modulation_1 = self.lfo_pitch_sin_1()
        pitch_modulation_1 = self.upsample(pitch_modulation_1)
        pitch_modulation_2 = self.lfo_pitch_sin_2()
        pitch_modulation_2 = self.upsample(pitch_modulation_2)

        vco_amp1 = adsr1 * (amp_modulation * 0.5 + 0.5)
        vco_amp2 = adsr2 * (amp_modulation * 0.5 + 0.5)
        vco_1_out = self.vco_1(midi_f0, pitch_modulation_1)
        vco_1_out = self.vca(vco_1_out, vco_amp1)

        vco_2_out = self.vco_2(midi_f0, pitch_modulation_1)
        vco_2_out = self.vca(vco_2_out, vco_amp2)

        return self.mixer(vco_1_out, vco_2_out)


class DoubleSawSynth(AmpModTorchSynth):
    """In addition to the shared modules, this synthesizer uses two "SquareSawVCO" modules to generate square and
    sawtooth waves"""

    def __init__(
            self,
            synthconfig: Optional[SynthConfig] = None,
            nebula: Optional[str] = "saw_square_voice",
            *args,
            **kwargs,
    ):
        AmpModTorchSynth.__init__(self, synthconfig=synthconfig, *args, **kwargs)

        # Register all modules as children
        module_list = self.share_modules
        module_list.append(("vco_1", SquareSawVCO))
        module_list.append(("vco_2", SquareSawVCO))
        self.add_synth_modules(module_list)


class SinSawSynth(AmpModTorchSynth):
    """In addition to the shared modules, this synthesizer uses a "SinVco" and a "SquareSawVCO" to generate
    sine and sawtooth/square waves """

    def __init__(
            self,
            synthconfig: Optional[SynthConfig] = None,
            nebula: Optional[str] = "sin_saw_voice",
            *args,
            **kwargs,
    ):
        AmpModTorchSynth.__init__(self, synthconfig=synthconfig, *args, **kwargs)

        # Register all modules as children
        module_list = self.share_modules
        module_list.append(("vco_1", SineVCO))
        module_list.append(("vco_2", SquareSawVCO))
        self.add_synth_modules(module_list)


class SinTriangleSynth(AmpModTorchSynth):
    """In addition to the shared modules, this synthesizer uses a "SinVco" and a "TriangleVCO" to generate
    sine and triangle waves """

    def __init__(
            self,
            synthconfig: Optional[SynthConfig] = None,
            nebula: Optional[str] = "sin_tri_voice",
            *args,
            **kwargs,
    ):
        AmpModTorchSynth.__init__(self, synthconfig=synthconfig, *args, **kwargs)

        # Register all modules as children
        module_list = self.share_modules
        module_list.append(("vco_1", SineVCO))
        module_list.append(("vco_2", TriangleVCO))
        self.add_synth_modules(module_list)


class TriangleSawSynth(AmpModTorchSynth):
    """In addition to the shared modules, this synthesizer uses a "TriangleVCO" and a "SquareSawVCO" to generate
    triangle and sawtooth/square waves """

    def __init__(
            self,
            synthconfig: Optional[SynthConfig] = None,
            nebula: Optional[str] = "triangle_saw_voice",
            *args,
            **kwargs,
    ):
        AmpModTorchSynth.__init__(self, synthconfig=synthconfig, *args, **kwargs)

        # Register all modules as children
        module_list = self.share_modules
        module_list.append(("vco_1", TriangleVCO))
        module_list.append(("vco_2", SquareSawVCO))
        self.add_synth_modules(module_list)


def amp_mod_with_duration(env, duration_l):
    env_np = env.detach().numpy()[0] + 1e-30
    env_np_shift = np.hstack([[0], env_np[:-1]])
    env_np_sign = (env_np - env_np_shift)[:duration_l] + 1e-30

    env_np_sign_nor = np.around(env_np_sign / np.abs(env_np_sign))
    env_np_sign_nor_shift = np.hstack([[0], env_np_sign_nor[:-1]])
    extreme_points = (env_np_sign_nor - env_np_sign_nor_shift)

    (max_loc,) = np.where(extreme_points == -2)

    n_max = len(max_loc)
    if n_max == 0:
        return env
    else:
        last_max_loc = max_loc[n_max - 1] - 1
        # new_env = np.hstack([env_np[:last_max_loc], np.ones(len(env_np) - last_max_loc) * env_np[last_max_loc]])
        new_env = np.hstack([env_np[:last_max_loc], (env_np[last_max_loc:] * 0.8 + 0.2)])


        return tensor([new_env])