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#!/usr/bin/env python

#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2016 The Qt Company Ltd.
## Contact: http://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."
##
## $QT_END_LICENSE$
##
#############################################################################

"""PySide2 port of the network/fortuneclient example from Qt v5.x"""

from PySide2 import QtCore, QtGui, QtWidgets, QtNetwork


class Client(QtWidgets.QDialog):
    def __init__(self, parent=None):
        super(Client, self).__init__(parent)

        self.blockSize = 0
        self.currentFortune = ''

        hostLabel = QtWidgets.QLabel("&Server name:")
        portLabel = QtWidgets.QLabel("S&erver port:")

        self.hostLineEdit = QtWidgets.QLineEdit('Localhost')
        self.portLineEdit = QtWidgets.QLineEdit()
        self.portLineEdit.setValidator(QtGui.QIntValidator(1, 65535, self))

        hostLabel.setBuddy(self.hostLineEdit)
        portLabel.setBuddy(self.portLineEdit)

        self.statusLabel = QtWidgets.QLabel("This examples requires that you run "
                "the Fortune Server example as well.")

        self.getFortuneButton = QtWidgets.QPushButton("Get Fortune")
        self.getFortuneButton.setDefault(True)
        self.getFortuneButton.setEnabled(False)

        quitButton = QtWidgets.QPushButton("Quit")

        buttonBox = QtWidgets.QDialogButtonBox()
        buttonBox.addButton(self.getFortuneButton,
                QtWidgets.QDialogButtonBox.ActionRole)
        buttonBox.addButton(quitButton, QtWidgets.QDialogButtonBox.RejectRole)

        self.tcpSocket = QtNetwork.QTcpSocket(self)

        self.hostLineEdit.textChanged.connect(self.enableGetFortuneButton)
        self.portLineEdit.textChanged.connect(self.enableGetFortuneButton)
        self.getFortuneButton.clicked.connect(self.requestNewFortune)
        quitButton.clicked.connect(self.close)
        self.tcpSocket.readyRead.connect(self.readFortune)
        self.tcpSocket.error.connect(self.displayError)

        mainLayout = QtWidgets.QGridLayout()
        mainLayout.addWidget(hostLabel, 0, 0)
        mainLayout.addWidget(self.hostLineEdit, 0, 1)
        mainLayout.addWidget(portLabel, 1, 0)
        mainLayout.addWidget(self.portLineEdit, 1, 1)
        mainLayout.addWidget(self.statusLabel, 2, 0, 1, 2)
        mainLayout.addWidget(buttonBox, 3, 0, 1, 2)
        self.setLayout(mainLayout)

        self.setWindowTitle("Fortune Client")
        self.portLineEdit.setFocus()

    def requestNewFortune(self):
        self.getFortuneButton.setEnabled(False)
        self.blockSize = 0
        self.tcpSocket.abort()
        self.tcpSocket.connectToHost(self.hostLineEdit.text(),
                int(self.portLineEdit.text()))

    def readFortune(self):
        instr = QtCore.QDataStream(self.tcpSocket)
        instr.setVersion(QtCore.QDataStream.Qt_4_0)

        if self.blockSize == 0:
            if self.tcpSocket.bytesAvailable() < 2:
                return

            self.blockSize = instr.readUInt16()

        if self.tcpSocket.bytesAvailable() < self.blockSize:
            return

        nextFortune = instr.readString()

        try:
            # Python v3.
            nextFortune = str(nextFortune, encoding='ascii')
        except TypeError:
            # Python v2.
            pass

        if nextFortune == self.currentFortune:
            QtCore.QTimer.singleShot(0, self.requestNewFortune)
            return

        self.currentFortune = nextFortune
        self.statusLabel.setText(self.currentFortune)
        self.getFortuneButton.setEnabled(True)

    def displayError(self, socketError):
        if socketError == QtNetwork.QAbstractSocket.RemoteHostClosedError:
            pass
        elif socketError == QtNetwork.QAbstractSocket.HostNotFoundError:
            QtWidgets.QMessageBox.information(self, "Fortune Client",
                    "The host was not found. Please check the host name and "
                    "port settings.")
        elif socketError == QtNetwork.QAbstractSocket.ConnectionRefusedError:
            QtWidgets.QMessageBox.information(self, "Fortune Client",
                    "The connection was refused by the peer. Make sure the "
                    "fortune server is running, and check that the host name "
                    "and port settings are correct.")
        else:
            QtWidgets.QMessageBox.information(self, "Fortune Client",
                    "The following error occurred: %s." % self.tcpSocket.errorString())

        self.getFortuneButton.setEnabled(True)

    def enableGetFortuneButton(self):
        self.getFortuneButton.setEnabled(bool(self.hostLineEdit.text() and
                self.portLineEdit.text()))


if __name__ == '__main__':

    import sys

    app = QtWidgets.QApplication(sys.argv)
    client = Client()
    client.show()
    sys.exit(client.exec_())