'''
Created on 03.07.2015

@author: jrenken
'''
from .datadevice import DataDevice
from qgis.PyQt.QtNetwork import QTcpSocket, QAbstractSocket
from qgis.PyQt.QtCore import pyqtSlot, QTimer, qVersion


class TcpDevice(DataDevice):
    '''
    classdocs
    '''

    def __init__(self, params={}, parent=None):
        '''
        Constructor
        '''
        super(TcpDevice, self).__init__(params, parent)

        self.iodevice = QTcpSocket()
        self.reconnect = int(params.get('Reconnect', 1000))
        self.host = params.get('Host', None)
        self.port = int(params.get('Port', 2000))
        self.gpsdInit = bool(params.get('GpsdInit', False))
        self.iodevice.readyRead.connect(self.readyRead)
        if qVersion() < '5.15':
            self.iodevice.error.connect(self.socketError)
        else:
            self.iodevice.errorOccurred.connect(self.socketError)
        self.iodevice.connected.connect(self.socketConnected)
        self.iodevice.disconnected.connect(self.socketDisconnected)

    @pyqtSlot(QAbstractSocket.SocketError)
    def socketError(self, error):
        if self.iodevice.state() != QAbstractSocket.ConnectedState:
            if self.reconnect > 0:
                QTimer.singleShot(self.reconnect, self.onReconnectTimer)

    def connectDevice(self):
        self.iodevice.connectToHost(self.host, self.port)

    def disconnectDevice(self):
        if self.iodevice.state() is QAbstractSocket.ConnectedState:
            self.iodevice.disconnectFromHost()

    def readData(self):
        size = self.iodevice.bytesAvailable()
        if size:
            data = self.iodevice.read(size)
            try:
                return data.decode()
            except UnicodeDecodeError:
                return '<decode error>'
        return ''

    def readLine(self):
        if self.iodevice.canReadLine():
            try:
                return self.iodevice.readLine().data().decode()
            except UnicodeDecodeError:
                return '<decode error>'
        return ''

    @pyqtSlot()
    def socketConnected(self):
        self.deviceConnected.emit(True)
        if self.gpsdInit:
            self.iodevice.writeData(b'?WATCH={"class":"WATCH","nmea":true}')

    @pyqtSlot()
    def socketDisconnected(self):
        self.deviceDisconnected.emit(True)
