#############################################################################
##
## Copyright (C) 2021 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
##
## This file is part of the Qt for Python examples of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
##   * Redistributions of source code must retain the above copyright
##     notice, this list of conditions and the following disclaimer.
##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
##     the documentation and/or other materials provided with the
##     distribution.
##   * Neither the name of The Qt Company Ltd nor the names of its
##     contributors may be used to endorse or promote products derived
##     from this software without specific prior written permission.
##
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
## $QT_END_LICENSE$
##
#############################################################################

"""
PySide6 port of Qt6 example examples/multimedia/audiosources

Audio Devices demonstrates how to create a simple application to list and test
the configuration for the various audio devices available on the target device
or desktop PC.

Note: This Python example is not fully complete as compared to its C++ counterpart.
Only the push mode works at the moment. For the pull mode to work, the class
QIODevice have python bindings that needs to be fixed.
"""
import sys
from typing import Optional

import PySide6
from PySide6.QtCore import QByteArray, QIODevice, QMargins, QRect, Qt, Signal, Slot
from PySide6.QtGui import QPainter, QPalette
from PySide6.QtMultimedia import (
    QAudio,
    QAudioDevice,
    QAudioFormat,
    QAudioSource,
    QMediaDevices,
)
from PySide6.QtWidgets import (
    QApplication,
    QComboBox,
    QPushButton,
    QSlider,
    QVBoxLayout,
    QWidget,
)


class AudioInfo:
    def __init__(self, format: QAudioFormat):
        super().__init__()
        self.m_format = format
        self.m_level = 0.0

    def calculate_level(self, data: bytes, length: int) -> float:
        channel_bytes: int = int(self.m_format.bytesPerSample())
        sample_bytes: int = int(self.m_format.bytesPerFrame())
        num_samples: int = int(length / sample_bytes)

        maxValue: float = 0
        m_offset: int = 0

        for i in range(num_samples):
            for j in range(self.m_format.channelCount()):
                value = 0
                if len(data) > m_offset:
                    data_sample = data[m_offset:]
                    value = self.m_format.normalizedSampleValue(data_sample)
                maxValue = max(value, maxValue)
                m_offset = m_offset + channel_bytes

        return maxValue


class RenderArea(QWidget):
    def __init__(self, parent: Optional[PySide6.QtWidgets.QWidget] = None) -> None:
        super().__init__(parent=parent)
        self.m_level = 0
        self.setBackgroundRole(QPalette.Base)
        self.setAutoFillBackground(True)
        self.setMinimumHeight(30)
        self.setMinimumWidth(200)

    def set_level(self, value):
        self.m_level = value
        self.update()

    def paintEvent(self, event: PySide6.QtGui.QPaintEvent) -> None:
        painter = QPainter(self)
        painter.setPen(Qt.black)
        frame = painter.viewport() - QMargins(10, 10, 10, 10)

        painter.drawRect(frame)

        if self.m_level == 0.0:
            # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
            painter.end()
            return

        pos: int = round((frame.width() - 1) * self.m_level)
        painter.fillRect(
            frame.left() + 1, frame.top() + 1, pos, frame.height() - 1, Qt.red
        )
        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
        painter.end()


class InputTest(QWidget):
    def __init__(self) -> None:
        super().__init__()
        self.m_devices = QMediaDevices(self)
        self.m_pullMode = False

        self.initialize_window()
        self.initialize_audio(QMediaDevices.defaultAudioInput())

    def initialize_window(self):
        self.layout = QVBoxLayout(self)

        self.m_canvas = RenderArea(self)
        self.layout.addWidget(self.m_canvas)

        self.m_device_box = QComboBox(self)
        default_device_info = QMediaDevices.defaultAudioInput()
        self.m_device_box.addItem(
            default_device_info.description(), default_device_info
        )

        for device_info in self.m_devices.audioInputs():
            if device_info != default_device_info:
                self.m_device_box.addItem(device_info.description(), device_info)

        self.m_device_box.activated[int].connect(self.device_changed)
        self.layout.addWidget(self.m_device_box)

        self.m_volume_slider = QSlider(Qt.Horizontal, self)
        self.m_volume_slider.setRange(0, 100)
        self.m_volume_slider.setValue(100)
        self.m_volume_slider.valueChanged.connect(self.slider_changed)
        self.layout.addWidget(self.m_volume_slider)

        self.m_mode_button = QPushButton(self)
        self.m_mode_button.clicked.connect(self.toggle_mode)
        self.layout.addWidget(self.m_mode_button)

        self.m_suspend_resume_button = QPushButton(self)
        self.m_suspend_resume_button.clicked.connect(self.toggle_suspend)
        self.layout.addWidget(self.m_suspend_resume_button)

    def initialize_audio(self, device_info: QAudioDevice):
        format = QAudioFormat()
        format.setSampleRate(8000)
        format.setChannelCount(1)
        format.setSampleFormat(QAudioFormat.Int16)

        self.m_audio_info = AudioInfo(format)

        self.m_audio_input = QAudioSource(device_info, format)
        initial_volume = QAudio.convertVolume(
            self.m_audio_input.volume(),
            QAudio.LinearVolumeScale,
            QAudio.LogarithmicVolumeScale,
        )
        self.m_volume_slider.setValue(int(round(initial_volume * 100)))
        self.toggle_mode()

    @Slot()
    def toggle_mode(self):
        self.m_audio_input.stop()
        self.toggle_suspend()

        self.m_mode_button.setText("Enable pull mode")
        io = self.m_audio_input.start()

        def push_mode_slot():
            len = self.m_audio_input.bytesAvailable()
            buffer_size = 4096
            if len > buffer_size:
                len = buffer_size
            buffer: QByteArray = io.read(len)
            if len > 0:
                level = self.m_audio_info.calculate_level(buffer, len)
                self.m_canvas.set_level(level)

        io.readyRead.connect(push_mode_slot)

    @Slot()
    def toggle_suspend(self):
        # toggle suspend/resume
        state = self.m_audio_input.state()
        if (state == QAudio.SuspendedState) or (state == QAudio.StoppedState):
            self.m_audio_input.resume()
            self.m_suspend_resume_button.setText("Suspend recording")
        elif state == QAudio.ActiveState:
            self.m_audio_input.suspend()
            self.m_suspend_resume_button.setText("Resume recording")
        # else no-op

    @Slot(int)
    def device_changed(self, index):
        self.m_audio_input.stop()
        self.m_audio_input.disconnect(self)
        self.initialize_audio(self.m_device_box.itemData(index))

    @Slot(int)
    def slider_changed(self, value):
        linearVolume = QAudio.convertVolume(
            value / float(100), QAudio.LogarithmicVolumeScale, QAudio.LinearVolumeScale
        )

        self.m_audio_input.setVolume(linearVolume)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    app.setApplicationName("Audio Sources Example")
    input = InputTest()
    input.show()
    sys.exit(app.exec())
