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"""PySide2 port of the charts/audio example from Qt v5.x"""

import sys
from PySide2.QtCharts import QtCharts
from PySide2.QtCore import QPointF
from PySide2.QtMultimedia import (QAudioDeviceInfo, QAudioFormat,
        QAudioInput)
from PySide2.QtWidgets import QApplication, QMainWindow, QMessageBox

sampleCount = 2000
resolution = 4

class MainWindow(QMainWindow):
    def __init__(self, device):
        super(MainWindow, self).__init__()

        self.series = QtCharts.QLineSeries()
        self.chart = QtCharts.QChart()
        self.chart.addSeries(self.series)
        self.axisX = QtCharts.QValueAxis()
        self.axisX.setRange(0, sampleCount)
        self.axisX.setLabelFormat("%g")
        self.axisX.setTitleText("Samples")
        self.axisY = QtCharts.QValueAxis()
        self.axisY.setRange(-1, 1)
        self.axisY.setTitleText("Audio level")
        self.chart.setAxisX(self.axisX, self.series)
        self.chart.setAxisY(self.axisY, self.series)
        self.chart.legend().hide()
        self.chart.setTitle("Data from the microphone ({})".format(device.deviceName()))

        formatAudio = QAudioFormat()
        formatAudio.setSampleRate(8000)
        formatAudio.setChannelCount(1)
        formatAudio.setSampleSize(8)
        formatAudio.setCodec("audio/pcm")
        formatAudio.setByteOrder(QAudioFormat.LittleEndian)
        formatAudio.setSampleType(QAudioFormat.UnSignedInt)

        self.audioInput = QAudioInput(device, formatAudio, self)
        self.ioDevice = self.audioInput.start()
        self.ioDevice.readyRead.connect(self._readyRead)

        self.chartView = QtCharts.QChartView(self.chart)
        self.setCentralWidget(self.chartView)

        self.buffer = [QPointF(x, 0) for x in range(sampleCount)]
        self.series.append(self.buffer)

    def closeEvent(self, event):
        if self.audioInput is not None:
            self.audioInput.stop()
        event.accept()

    def _readyRead(self):
        data = self.ioDevice.readAll()
        availableSamples = data.size() // resolution
        start = 0
        if (availableSamples < sampleCount):
            start = sampleCount - availableSamples
            for s in range(start):
                self.buffer[s].setY(self.buffer[s + availableSamples].y())

        dataIndex = 0
        for s in range(start, sampleCount):
            value = (ord(data[dataIndex]) - 128) / 128
            self.buffer[s].setY(value)
            dataIndex = dataIndex + resolution
        self.series.replace(self.buffer)

if __name__ == '__main__':
    app = QApplication(sys.argv)

    inputDevice = QAudioDeviceInfo.defaultInputDevice()
    if (inputDevice.isNull()):
        QMessageBox.warning(None, "audio", "There is no audio input device available.")
        sys.exit(-1)

    mainWin = MainWindow(inputDevice)
    mainWin.setWindowTitle("audio")
    availableGeometry = app.desktop().availableGeometry(mainWin)
    size = availableGeometry.height() * 3 / 4
    mainWin.resize(size, size)
    mainWin.show()
    sys.exit(app.exec_())