import pyaudio
import struct
import numpy
import time
from threading import Thread

sound_buffer = []


class AudioStream(Thread):
    def __init__(self, _channels: int = 1, _sample_rate: int = 48000, _frames_per_buffer: int = 2048,
                 _input_device_index: int = None, _output_device_index: int = None, _input: bool = True,
                 _output: bool = True):
        super(AudioStream, self).__init__()
        self.paInstance_kwargs = {
            'format': pyaudio.paFloat32,
            'channels': _channels,
            'rate': _sample_rate,
            'input': _input,
            'output': _output,
            'frames_per_buffer': _frames_per_buffer,
            'stream_callback': callback
        }

        if _input_device_index:
            if _input:
                self.paInstance_kwargs['input_device_index'] = _input_device_index
            else:
                print(f"[AudioStream.__init__]:\tInput was not enabled."
                      f" Reinitialize with '_input=True'")

        if _output_device_index:
            if _output:
                self.paInstance_kwargs['output_device_index'] = _output_device_index
            else:
                print(f"[AudioStream.__init__]:\tOutput was not enabled."
                      f" Reinitialize with '_output=True'")

        # Init PyAudio instance
        self.paInstance = pyaudio.PyAudio()

        # Define and initialize stream object if we have been passed a device ID (pyaudio.open)
        self.stream = None
        if _output_device_index and _input_device_index:
            self.init_stream()

        # temp section

    def init_stream(self, _new_output_device_index: int = None, _new_input_device_index: int = None):
        # Check what device was asked to be changed (or set)
        if _new_input_device_index:
            if self.paInstance_kwargs['input']:
                self.paInstance_kwargs['input_device_index'] = _new_input_device_index
            else:
                print(f"[AudioStream.init_stream]:\tInput was not enabled when initialized."
                      f" Reinitialize with '_input=True'")

        if _new_output_device_index:
            if self.paInstance_kwargs['output']:
                self.paInstance_kwargs['output_device_index'] = _new_output_device_index
            else:
                print(f"[AudioStream.init_stream]:\tOutput was not enabled when initialized."
                      f" Reinitialize with '_output=True'")

        self.close_if_open()

        # Reopen the stream
        self.stream = self.paInstance.open(**self.paInstance_kwargs)

    def close_if_open(self):
        # Stop the stream if it is started
        if self.stream:
            if self.stream.is_active():
                self.stream.stop_stream()
                self.stream.close()
                print(f"[ReopenStream.close_if_open]:\t Stream was open; It was closed.")

    def list_devices(self, _show_input_devices: bool = True, _show_output_devices: bool = True):
        info = self.paInstance.get_host_api_info_by_index(0)
        numdevices = info.get('deviceCount')

        for i in range(0, numdevices):
            if (self.paInstance.get_device_info_by_host_api_device_index(0, i).get('maxInputChannels')) > 0:
                if _show_input_devices:
                    print("Input Device id ", i, " - ",
                          self.paInstance.get_device_info_by_host_api_device_index(0, i).get('name'))

            if (self.paInstance.get_device_info_by_host_api_device_index(0, i).get('maxOutputChannels')) > 0:
                if _show_output_devices:
                    print("Output Device id ", i, " - ",
                          self.paInstance.get_device_info_by_host_api_device_index(0, i).get('name'))


class NoiseGate(AudioStream):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

    def run(self) -> None:
        # Start the audio stream
        self.stream.start_stream()

        global sound_buffer
        # While the stream is running, display the stream buffer in floats?
        while self.stream.is_active():
            if len(sound_buffer) > 0:
                for buffer in sound_buffer:
                    volume_normalization = numpy.linalg.norm(numpy.fromstring(buffer)) * 10
                    print(str(float(volume_normalization)))

        self.stream.stop_stream()
        self.stream.close()

        self.paInstance.terminate()


def callback(in_data, frame_count, time_info, status):
    global sound_buffer

    sound_buffer.append(in_data)

    return in_data, pyaudio.paContinue


if __name__ == '__main__':
    input_index = int(input("Input:\t"))
    output_index = int(input("Output:\t"))

    ng = NoiseGate(_input_device_index=input_index, _output_device_index=output_index)

    ng.start()