#!/usr/bin/env python


#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
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## 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 Nokia Corporation and its Subsidiary(-ies) nor
##     the names of its contributors may be used to endorse or promote
##     products derived from this software without specific prior written
##     permission.
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## $QT_END_LICENSE$
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#############################################################################


import random

from PyQt5.QtCore import (pyqtSignal, QByteArray, QDataStream, QIODevice,
        QThread)
from PyQt5.QtWidgets import (QApplication, QDialog, QHBoxLayout, QLabel,
        QMessageBox, QPushButton, QVBoxLayout)
from PyQt5.QtNetwork import (QHostAddress, QNetworkInterface, QTcpServer,
        QTcpSocket)


class FortuneThread(QThread):
    error = pyqtSignal(QTcpSocket.SocketError)

    def __init__(self, socketDescriptor, fortune, parent):
        super(FortuneThread, self).__init__(parent)

        self.socketDescriptor = socketDescriptor
        self.text = fortune

    def run(self):
        tcpSocket = QTcpSocket()
        if not tcpSocket.setSocketDescriptor(self.socketDescriptor):
            self.error.emit(tcpSocket.error())
            return

        block = QByteArray()
        outstr = QDataStream(block, QIODevice.WriteOnly)
        outstr.setVersion(QDataStream.Qt_4_0)
        outstr.writeUInt16(0)
        outstr.writeQString(self.text)
        outstr.device().seek(0)
        outstr.writeUInt16(block.size() - 2)

        tcpSocket.write(block)
        tcpSocket.disconnectFromHost()
        tcpSocket.waitForDisconnected()


class FortuneServer(QTcpServer):
    FORTUNES = (
        "You've been leading a dog's life. Stay off the furniture.",
        "You've got to think about tomorrow.",
        "You will be surprised by a loud noise.",
        "You will feel hungry again in another hour.",
        "You might have mail.",
        "You cannot kill time without injuring eternity.",
        "Computers are not intelligent. They only think they are.")

    def incomingConnection(self, socketDescriptor):
        fortune = self.FORTUNES[random.randint(0, len(self.FORTUNES) - 1)]

        thread = FortuneThread(socketDescriptor, fortune, self)
        thread.finished.connect(thread.deleteLater)
        thread.start()


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

        self.server = FortuneServer()

        statusLabel = QLabel()
        statusLabel.setWordWrap(True)
        quitButton = QPushButton("Quit")
        quitButton.setAutoDefault(False)

        if not self.server.listen():
            QMessageBox.critical(self, "Threaded Fortune Server",
                    "Unable to start the server: %s." % self.server.errorString())
            self.close()
            return

        for ipAddress in QNetworkInterface.allAddresses():
            if ipAddress != QHostAddress.LocalHost and ipAddress.toIPv4Address() != 0:
                break
        else:
            ipAddress = QHostAddress(QHostAddress.LocalHost)

        ipAddress = ipAddress.toString()

        statusLabel.setText("The server is running on\n\nIP: %s\nport: %d\n\n"
                "Run the Fortune Client example now." % (ipAddress, self.server.serverPort()))

        quitButton.clicked.connect(self.close)

        buttonLayout = QHBoxLayout()
        buttonLayout.addStretch(1)
        buttonLayout.addWidget(quitButton)
        buttonLayout.addStretch(1)

        mainLayout = QVBoxLayout()
        mainLayout.addWidget(statusLabel)
        mainLayout.addLayout(buttonLayout)
        self.setLayout(mainLayout)

        self.setWindowTitle("Threaded Fortune Server")


if __name__ == '__main__':

    import sys

    app = QApplication(sys.argv)
    dialog = Dialog()
    dialog.show()
    sys.exit(dialog.exec_())