#!/usr/bin/env python
 
 
#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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## This file is part of the examples of PyQt.
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from PyQt5.QtCore import QDataStream, QSettings, QTimer
from PyQt5.QtGui import QIntValidator
from PyQt5.QtWidgets import (QApplication, QComboBox, QDialog,
        QDialogButtonBox, QGridLayout, QLabel, QLineEdit, QMessageBox,
        QPushButton)
from PyQt5.QtNetwork import (QAbstractSocket, QHostInfo, QNetworkConfiguration,
        QNetworkConfigurationManager, QNetworkInterface, QNetworkSession,
        QTcpSocket)
 
 
class Client(QDialog):
    def __init__(self, parent=None):
        super(Client, self).__init__(parent)
 
        self.networkSession = None
        self.blockSize = 0
        self.currentFortune = ''
 
        hostLabel = QLabel("&Server name:")
        portLabel = QLabel("S&erver port:")
 
        self.hostCombo = QComboBox()
        self.hostCombo.setEditable(True)
 
        name = QHostInfo.localHostName()
        if name != '':
            self.hostCombo.addItem(name)
 
            domain = QHostInfo.localDomainName()
            if domain != '':
                self.hostCombo.addItem(name + '.' + domain)
 
        if name != 'localhost':
            self.hostCombo.addItem('localhost')
 
        ipAddressesList = QNetworkInterface.allAddresses()
 
        for ipAddress in ipAddressesList:
            if not ipAddress.isLoopback():
                self.hostCombo.addItem(ipAddress.toString())
 
        for ipAddress in ipAddressesList:
            if ipAddress.isLoopback():
                self.hostCombo.addItem(ipAddress.toString())
 
        self.portLineEdit = QLineEdit()
        self.portLineEdit.setValidator(QIntValidator(1, 65535, self))
 
        hostLabel.setBuddy(self.hostCombo)
        portLabel.setBuddy(self.portLineEdit)
 
        self.statusLabel = QLabel("This examples requires that you run "
                "the Fortune Server example as well.")
 
        self.getFortuneButton = QPushButton("Get Fortune")
        self.getFortuneButton.setDefault(True)
        self.getFortuneButton.setEnabled(False)
 
        quitButton = QPushButton("Quit")
 
        buttonBox = QDialogButtonBox()
        buttonBox.addButton(self.getFortuneButton, QDialogButtonBox.ActionRole)
        buttonBox.addButton(quitButton, QDialogButtonBox.RejectRole)
 
        self.tcpSocket = QTcpSocket(self)
 
        self.hostCombo.editTextChanged.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 = QGridLayout()
        mainLayout.addWidget(hostLabel, 0, 0)
        mainLayout.addWidget(self.hostCombo, 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()
 
        manager = QNetworkConfigurationManager()
        if manager.capabilities() & QNetworkConfigurationManager.NetworkSessionRequired:
            settings = QSettings(QSettings.UserScope, 'QtProject')
            settings.beginGroup('QtNetwork')
            id = settings.value('DefaultNetworkConfiguration')
            settings.endGroup()
 
            config = manager.configurationFromIdentifier(id)
            if config.state() & QNetworkConfiguration.Discovered == 0:
                config = manager.defaultConfiguration()
 
            self.networkSession = QNetworkSession(config, self)
            self.networkSession.opened.connect(self.sessionOpened)
 
            self.getFortuneButton.setEnabled(False)
            self.statusLabel.setText("Opening network session.")
            self.networkSession.open()
 
    def requestNewFortune(self):
        self.getFortuneButton.setEnabled(False)
        self.blockSize = 0
        self.tcpSocket.abort()
        self.tcpSocket.connectToHost(self.hostCombo.currentText(),
                int(self.portLineEdit.text()))
 
    def readFortune(self):
        instr = QDataStream(self.tcpSocket)
        instr.setVersion(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.readQString()
        if nextFortune == self.currentFortune:
            QTimer.singleShot(0, self.requestNewFortune)
            return
 
        self.currentFortune = nextFortune
        self.statusLabel.setText(self.currentFortune)
        self.getFortuneButton.setEnabled(True)
 
    def displayError(self, socketError):
        if socketError == QAbstractSocket.RemoteHostClosedError:
            pass
        elif socketError == QAbstractSocket.HostNotFoundError:
            QMessageBox.information(self, "Fortune Client",
                    "The host was not found. Please check the host name and "
                    "port settings.")
        elif socketError == QAbstractSocket.ConnectionRefusedError:
            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:
            QMessageBox.information(self, "Fortune Client",
                    "The following error occurred: %s." % self.tcpSocket.errorString())
 
        self.getFortuneButton.setEnabled(True)
 
    def enableGetFortuneButton(self):
        self.getFortuneButton.setEnabled(
                (self.networkSession is None or self.networkSession.isOpen())
                and self.hostCombo.currentText() != ''
                and self.portLineEdit.text() != '')
 
    def sessionOpened(self):
        config = self.networkSession.configuration()
 
        if config.type() == QNetworkConfiguration.UserChoice:
            id = self.networkSession.sessionProperty('UserChoiceConfiguration')
        else:
            id = config.identifier()
 
        settings = QSettings(QSettings.UserScope, 'QtProject')
        settings.beginGroup('QtNetwork')
        settings.setValue('DefaultNetworkConfiguration', id)
        settings.endGroup()
 
        self.statusLabel.setText("This examples requires that you run the "
                            "Fortune Server example as well.")
 
        self.enableGetFortuneButton()
 
 
if __name__ == '__main__':
 
    import sys
 
    app = QApplication(sys.argv)
    client = Client()
    client.show()
    sys.exit(client.exec_())