# -*- coding: utf-8 -*-

#-------------------------------------------------------------------------------

# This file is part of Code_Saturne, a general-purpose CFD tool.
#
# Copyright (C) 1998-2015 EDF S.A.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
# Street, Fifth Floor, Boston, MA 02110-1301, USA.

#-------------------------------------------------------------------------------

"""
This module defines the main application classes for the Qt GUI.
This GUI provides a simple way to display independante pages, in order to put
informations in the XML document, which reflets the treated case.

This module defines the following classes:
- NewCaseDialogView
- MainView

    @copyright: 1998-2014 EDF S.A., France
    @author: U{EDF R&D<mailto:saturne-support@edf.fr>}
    @license: GNU GPL v2, see COPYING for details.
"""

#-------------------------------------------------------------------------------
# Standard modules
#-------------------------------------------------------------------------------

import os, sys, string, shutil, signal, logging
import subprocess, platform

try:
    import ConfigParser  # Python2
    configparser = ConfigParser
except Exception:
    import configparser  # Python3

#-------------------------------------------------------------------------------
# Third-party modules
#-------------------------------------------------------------------------------

from PyQt4.QtCore import *
from PyQt4.QtGui  import *

#-------------------------------------------------------------------------------
# Application modules
#-------------------------------------------------------------------------------

import cs_info
from cs_exec_environment import \
    separate_args, update_command_single_value, assemble_args, enquote_arg
import cs_runcase

try:
    from code_saturne.Base.MainForm import Ui_MainForm
    from code_saturne.Base.NewCaseDialogForm import Ui_NewCaseDialogForm
except:
    sys.path.insert(1, os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "Base"))
    from code_saturne.Base.MainForm import Ui_MainForm
    from code_saturne.Base.NewCaseDialogForm import Ui_NewCaseDialogForm

from code_saturne.Base.IdView import IdView
from code_saturne.Base.BrowserView import BrowserView
from code_saturne.Base import XMLengine
from code_saturne.Base.XMLinitialize import *
from code_saturne.Base.XMLmodel import *
from code_saturne.Base.Toolbox import GuiParam, displaySelectedPage
from code_saturne.Base.Common import XML_DOC_VERSION

try:
    import code_saturne.Pages
except:
    sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from code_saturne.Pages.WelcomeView import WelcomeView
from code_saturne.Pages.IdentityAndPathesModel import IdentityAndPathesModel
from code_saturne.Pages.XMLEditorView import XMLEditorView
from code_saturne.Base.QtPage import setGreenColor, getexistingdirectory
from code_saturne.Base.QtPage import from_qvariant, to_text_string, getopenfilename, getsavefilename


#-------------------------------------------------------------------------------
# log config
#-------------------------------------------------------------------------------

logging.basicConfig()
log = logging.getLogger("MainView")
log.setLevel(GuiParam.DEBUG)

#-------------------------------------------------------------------------------
# New case dialog
#-------------------------------------------------------------------------------

class NewCaseDialogView(QDialog, Ui_NewCaseDialogForm):
    """
    Advanced dialog
    """
    def __init__(self, parent, pkg):
        """
        Constructor
        """
        QDialog.__init__(self, parent)

        Ui_NewCaseDialogForm.__init__(self)
        self.setupUi(self)

        self.package = pkg

        self.createMesh = False
        self.createPost = False
        self.copyFrom = False
        self.copyFromName = None
        self.caseName = None

        self.currentPath = str(QDir.currentPath())
        self.model = QFileSystemModel(self)
        self.model.setRootPath(self.currentPath)
        self.model.setFilter(QDir.Dirs)

        self.listViewDirectory.setModel(self.model)
        self.modelFolder = QStringListModel()
        self.listViewFolder.setModel(self.modelFolder)

        self.listViewDirectory.setRootIndex(self.model.index(self.currentPath))

        self.lineEditCurrentPath.setText(str(self.currentPath))

        self.pushButtonCopyFrom.setEnabled(False)

        self.connect(self.listViewDirectory,   SIGNAL("doubleClicked(QModelIndex)"),   self.slotParentDirectory)
        self.connect(self.listViewFolder,      SIGNAL("clicked(QModelIndex)"),         self.slotSelectFolder)
        self.connect(self.lineEditCurrentPath, SIGNAL("textChanged(const QString &)"), self.slotChangeDirectory)
        self.connect(self.lineEditCaseName,    SIGNAL("textChanged(const QString &)"), self.slotChangeName)
        self.connect(self.checkBoxPost,        SIGNAL("clicked()"),                    self.slotPostStatus)
        self.connect(self.checkBoxMesh,        SIGNAL("clicked()"),                    self.slotMeshStatus)
        self.connect(self.checkBoxCopyFrom,    SIGNAL("clicked()"),                    self.slotCopyFromStatus)
        self.connect(self.pushButtonCopyFrom,  SIGNAL("clicked()"),                    self.slotCopyFromCase)


    def slotParentDirectory(self, index):
        if index.row() == 1 and index.column() == 0:
            # ".." change directory
            self.currentPath = os.path.abspath(os.path.join(self.currentPath, ".."))
            self.model.setRootPath(self.currentPath)
            self.listViewDirectory.setRootIndex(self.model.index(self.currentPath))
        elif index.row() > 1:
            self.currentPath = self.model.filePath(index)
            self.model.setRootPath(self.currentPath)
            self.listViewDirectory.setRootIndex(self.model.index(self.currentPath))
        self.lineEditCurrentPath.setText(str(self.currentPath))

        # construct list of study in current directory
        cpath = QDir(str(self.currentPath))
        cpath.setFilter(QDir.Dirs | QDir.NoSymLinks)
        lst = []
        self.modelFolder.setStringList([])
        for name in cpath.entryList():
            stud = True
            base = os.path.abspath(os.path.join(self.currentPath, str(name)))
            for rep in ['DATA',
                        'RESU',
                        'SRC',
                        'SCRIPTS']:
                directory = os.path.abspath(os.path.join(base, rep))
                if not(os.path.isdir(directory)):
                    stud = False
            if stud:
                lst.append(name)
        self.modelFolder.setStringList(lst)


    def slotSelectFolder(self, index):
        if index.row() > 1:
            self.lineEditCaseName.setText(str(self.model.fileName(index)))


    @pyqtSignature("const QString &")
    def slotChangeDirectory(self, text):
        """
        change directory
        """
        if os.path.isdir(text):
            self.currentPath = str(text)
            self.model.setRootPath(self.currentPath)
            self.listViewDirectory.setRootIndex(self.model.index(self.currentPath))


    @pyqtSignature("const QString &")
    def slotChangeName(self, text):
        """
        change case name
        """
        self.caseName = str(text)


    @pyqtSignature("")
    def slotPostStatus(self):
        if self.checkBoxPost.isChecked():
            self.createMesh = True
        else:
            self.createMesh = False


    @pyqtSignature("")
    def slotMeshStatus(self):
        if self.checkBoxMesh.isChecked():
            self.createPost = True
        else:
            self.createPost = False


    @pyqtSignature("")
    def slotCopyFromStatus(self):
        if self.checkBoxCopyFrom.isChecked():
            self.copyFrom = True
            self.pushButtonCopyFrom.setEnabled(True)
            setGreenColor(self.pushButtonCopyFrom, True)
        else:
            self.copyFrom = False
            setGreenColor(self.pushButtonCopyFrom, False)
            self.pushButtonCopyFrom.setEnabled(False)


    @pyqtSignature("")
    def slotCopyFromCase(self):
        title = self.tr("Choose an existing case")

        path = os.getcwd()
        dataPath = os.path.join(path, "..", "DATA")
        if os.path.isdir(dataPath): path = dataPath

        dirName = getexistingdirectory(self, title,
                                       path,
                                       QFileDialog.ShowDirsOnly |
                                       QFileDialog.DontResolveSymlinks)
        if not dirName:
            self.copyFromName = None
        else:
            self.copyFromName = str(dirName)
            setGreenColor(self.pushButtonCopyFrom, False)


    @pyqtSignature("")
    def accept(self):
        """
        Method called when user clicks 'OK'
        """
        if self.caseName == None or self.caseName == "":
            msg = "name case not defined"
            sys.stderr.write(msg + '\n')
        elif self.copyFrom == True and self.copyFromName == None:
            msg = "copy from case not defined"
            sys.stderr.write(msg + '\n')
        else:
            cmd = [os.path.join(self.package.get_dir("bindir"), self.package.name),
                   'create', '-c',
                   os.path.join(self.currentPath, self.caseName)]
            if self.copyFrom == True:
                cmd += ['--copy-from', self.copyFromName]

            p = subprocess.Popen(cmd,
                                 stdout=subprocess.PIPE,
                                 stderr=subprocess.PIPE,
                                 universal_newlines=True)
            output = p.communicate()
            if p.returncode != 0:
                sys.stderr.write(output[1] + '\n')

            if self.createMesh == True:
                path = os.path.join(self.currentPath, "MESH")
                os.mkdir(path)
            if self.createPost == True:
                path = os.path.join(self.currentPath, "POST")
                os.mkdir(path)

            self.currentPath = os.path.join(self.currentPath,
                                            self.caseName,
                                            "DATA")
            self.model.setRootPath(self.currentPath)
            self.listViewDirectory.setRootIndex(self.model.index(self.currentPath))
            self.lineEditCurrentPath.setText(str(self.currentPath))

            os.chdir(self.currentPath)
            QDialog.accept(self)


    def reject(self):
        """
        Method called when user clicks 'Cancel'
        """
        QDialog.reject(self)


#-------------------------------------------------------------------------------
# Base Main Window
#-------------------------------------------------------------------------------

class MainView(object):
    """
    Abstract class
    """
    NextId = 1
    Instances = set()

    def __new__(cls, cmd_package = None, cmd_case = "", cmd_salome = None):
        """
        Factory
        """
        if cmd_package.name == 'code_saturne':
            return MainViewSaturne.__new__(MainViewSaturne, cmd_package, cmd_case, cmd_salome)
        elif cmd_package.name == 'neptune_cfd':
            from core.MainView import MainViewNeptune
            return MainViewNeptune.__new__(MainViewNeptune, cmd_package, cmd_case, cmd_salome)


    @staticmethod
    def updateInstances(qobj):
        """
        Overwrites the Instances set with a set that contains only those
        window instances that are still alive.
        """
        MainView.Instances = set([window for window \
                in MainView.Instances if isAlive(window)])


    def ui_initialize(self):
        self.setAttribute(Qt.WA_DeleteOnClose)
        MainView.Instances.add(self)

        self.setWindowTitle(self.package.code_name + " GUI" + " - " + self.package.version)

        self.Id = IdView()
        self.dockWidgetIdentity.setWidget(self.Id)

        self.dockWidgetBrowser.setWidget(self.Browser)

        self.scrollArea = QScrollArea(self.frame)
        self.gridlayout1.addWidget(self.scrollArea,0,0,1,1)
        self.gridlayout1.setMargin(0)
        self.gridlayout1.setSpacing(0)
        self.gridlayout.addWidget(self.frame,0,0,1,1)

        self.scrollArea.setWidgetResizable(True)
        self.scrollArea.setFrameShape(QFrame.StyledPanel)
        self.scrollArea.setFrameShadow(QFrame.Raised)
        self.scrollArea.setFrameStyle(QFrame.NoFrame)

        # connections

        self.connect(self.fileOpenAction,   SIGNAL("triggered()"),   self.fileOpen)
        self.connect(self.caseNewAction,    SIGNAL("triggered()"),   self.caseNew)
        self.connect(self.fileNewAction,    SIGNAL("triggered()"),   self.fileNew)
        self.connect(self.menuRecent,       SIGNAL("aboutToShow()"), self.updateRecentFileMenu)
        self.connect(self.fileSaveAction,   SIGNAL("triggered()"),   self.fileSave)
        self.connect(self.fileSaveAsAction, SIGNAL("triggered()"),   self.fileSaveAs)
        self.connect(self.fileCloseAction,  SIGNAL("triggered()"),   self.close)
        self.connect(self.fileQuitAction,   SIGNAL("triggered()"),   self.fileQuit)

        self.connect(self.openXtermAction,      SIGNAL("triggered()"), self.openXterm)
        self.connect(self.displayCaseAction,    SIGNAL("triggered()"), self.displayCase)

        self.connect(self.IdentityAction, SIGNAL("toggled(bool)"), self.dockWidgetIdentityDisplay)
        self.connect(self.BrowserAction,  SIGNAL("toggled(bool)"), self.dockWidgetBrowserDisplay)

        self.connect(self.displayAboutAction,    SIGNAL("triggered()"), self.displayAbout)
        self.connect(self.backgroundColorAction, SIGNAL("triggered()"), self.setColor)
        self.connect(self.actionFont,            SIGNAL("triggered()"), self.setFontSize)
        self.connect(self.RestoreStyleDefaults,  SIGNAL("triggered()"), self.restoreStyleDefaults)

        self.connect(self.displayLicenceAction,  SIGNAL("triggered()"), self.displayLicence)

        # connection for page layout

        self.connect(self.Browser.treeView, SIGNAL("pressed(const QModelIndex &)"), self.displayNewPage)
        self.connect(self, SIGNAL("destroyed(QObject*)"), MainView.updateInstances)

        # Ctrl+C signal handler (allow to shutdown the GUI with Ctrl+C)

        signal.signal(signal.SIGINT, signal.SIG_DFL)

        self.resize(800, 700)

        # restore system settings

        settings = QSettings()

        try:
            # API 2
            if settings.value("RecentFiles", []) is not None:
                try:
                    recentFiles = settings.value("RecentFiles").toStringList()
                    self.recentFiles = []
                    for f in recentFiles:
                        self.recentFiles.append(str(f))
                except:
                    self.recentFiles = list(settings.value("RecentFiles", []))
            else:
                self.recentFiles = []
            self.restoreGeometry(settings.value("MainWindow/Geometry", QByteArray()))
            self.restoreState(settings.value("MainWindow/State", QByteArray()))
        except:
            # API 1
            self.recentFiles = settings.value("RecentFiles").toStringList()
            self.restoreGeometry(settings.value("MainWindow/Geometry").toByteArray())
            self.restoreState(settings.value("MainWindow/State").toByteArray())

        app = QCoreApplication.instance()

        self.palette_default = None
        self.font_default = None

        if settings.contains("MainWindow/Color"):
            color = settings.value("MainWindow/Color",
                                   self.palette().color(QPalette.Window).name())
            color = QColor(color)
            if color.isValid():
                if not self.palette_default:
                    self.palette_default = QPalette().resolve(self.palette())
                self.setPalette(QPalette(color))
                app.setPalette(QPalette(color))

        if settings.contains("MainWindow/Font"):
            f = settings.value("MainWindow/Font", str(self.font()))
            if f:
                if not self.font_default:
                    self.font_default = self.font()
                font = QFont()
                if (font.fromString(from_qvariant(f, to_text_string))):
                    self.setFont(font)
                    app.setFont(font)

        self.actionPrepro.setEnabled(False)
        self.actionCalculation.setEnabled(False)

        self.updateRecentFileMenu()
        QTimer.singleShot(0, self.loadInitialFile)

        self.statusbar.setSizeGripEnabled(False)
        self.statusbar.showMessage(self.tr("Ready"), 5000)
        self.actionRedo.setEnabled(False)
        self.actionUndo.setEnabled(False)


    def loadInitialFile(self):
        """
        Private method.

        Checks the opening mode (from command line).
        """
        log.debug("loadInitialFile -> %s" % self.cmd_case)

        # 1) new case
        if self.cmd_case == "new case":
            MainView.NextId += 1
            self.fileNew()
            self.dockWidgetBrowserDisplay(True)

        # 2) existing case

        elif self.cmd_case:
            try:
                self.loadFile(self.cmd_case)
                self.dockWidgetBrowserDisplay(True)
            except:
                raise

        # 3) neutral point (default page layout)

        else:
            self.displayWelcomePage()
            self.dockWidgetBrowserDisplay(False)


    @pyqtSignature("bool")
    def dockWidgetIdentityDisplay(self, bool=True):
        """
        Private slot.

        Show or hide the  the identity dock window.

        @type bool: C{True} or C{False}
        @param bool: if C{True}, shows the identity dock window
        """
        if bool:
            self.dockWidgetIdentity.show()
        else:
            self.dockWidgetIdentity.hide()


    @pyqtSignature("bool")
    def dockWidgetBrowserDisplay(self, bool=True):
        """
        Private slot.

        Show or hide the browser dock window.

        @type bool: C{True} or C{False}
        @param bool: if C{True}, shows the browser dock window
        """
        if bool:
            self.dockWidgetBrowser.show()
        else:
            self.dockWidgetBrowser.hide()


    @pyqtSignature("")
    def updateRecentFileMenu(self):
        """
        private method

        update the File menu with the recent files list
        """
        self.menuRecent.clear()

        if hasattr(self, 'case'):
            current = str(self.case['xmlfile'])
        else:
            current = ""

        recentFiles = []
        for f in self.recentFiles:
            if f != current and QFile.exists(f):
                recentFiles.append(f)

        if recentFiles:
            for i, f in enumerate(recentFiles):
                action = QAction(QIcon(":/icons/22x22/document-open.png"), "&%d %s" % (
                           i + 1, QFileInfo(f).fileName()), self)
                action.setData(f)
                self.connect(action,
                             SIGNAL("triggered()"),
                             self.loadRecentFile)
                self.menuRecent.addAction(action)


    def addRecentFile(self, fname):
        """
        private method

        creates and update the list of the recent files

        @type fname: C{str}
        @param fname: filename to add in the recent files list
        """
        if fname is None:
            return
        if not fname in self.recentFiles:
            self.recentFiles.insert(0, str(fname))
            # l'idée est de garder les 8 premiers élements de la
            # liste. On pourrait donc remplacer le code ci-dessus par
            # :
            # self.recentFiles = self.recentFiles[:8]
            while len(self.recentFiles) > 9:
                try:
                    self.recentFiles.removeLast()
                except:
                    try:
                        self.recentFiles.pop()
                    except:
                        self.recentFiles.takeLast()


    def closeEvent(self, event):
        """
        public slot

        try to quit all the current MainWindow
        """
        if self.okToContinue():
            settings = QSettings()
            if self.recentFiles:
                recentFiles = self.recentFiles
            else:
                recentFiles = []

            settings.setValue("RecentFiles", recentFiles)
            settings.setValue("MainWindow/Geometry",
                              self.saveGeometry())
            settings.setValue("MainWindow/State",
                              self.saveState())

            event.accept()
            log.debug("closeEvent -> accept")

        else:
            event.ignore()
            log.debug("closeEvent -> ignore")


    def okToContinue(self):
        """
        private method

        ask for unsaved changes before quit

        @return: C{True} or C{False}
        """
        title = self.tr("Quit")
        msg   = self.tr("Save unsaved changes?")

        if hasattr(self, 'case'):
            log.debug("okToContinue -> %s" % self.case.isModified())

        if hasattr(self, 'case') and self.case.isModified():
            reply = QMessageBox.question(self,
                                         title,
                                         msg,
                                         QMessageBox.Yes|
                                         QMessageBox.No|
                                         QMessageBox.Cancel)
            if reply == QMessageBox.Cancel:
                return False
            elif reply == QMessageBox.Yes:
                self.fileSave()

        return True


    @pyqtSignature("")
    def fileQuit(self):
        """
        Public slot.

        try to quit all window
        """
        QApplication.closeAllWindows()


    @pyqtSignature("")
    def fileNew(self):
        """
        Public slot.

        create new Code_Saturne case
        """
        if not hasattr(self, 'case'):
            self.case = XMLengine.Case(package=self.package)
            self.case.root()['version'] = self.XML_DOC_VERSION
            self.initCase()
            title = self.tr("New parameters set") + \
                     " - " + self.tr(self.package.code_name) + self.tr(" GUI") \
                     + " - " + self.package.version
            self.setWindowTitle(title)

            self.Browser.configureTree(self.case)
            self.dockWidgetBrowserDisplay(True)

            self.case['salome'] = self.salome
            self.scrollArea.setWidget(self.displayFisrtPage())
            self.case['saved'] = "yes"

            self.connect(self.case, SIGNAL("undo"), self.slotUndoRedoView)
        else:
            MainView(cmd_package=self.package, cmd_case="new case").show()
        self.actionPrepro.setEnabled(True)
        self.actionCalculation.setEnabled(True)


    @pyqtSignature("")
    def caseNew(self):
        """
        Public slot.

        create new Code_Saturne case
        """
        if not hasattr(self, 'case') or not self.case['xmlfile']:
            dialog = NewCaseDialogView(self, self.package)
            if dialog.exec_():
                self.case = XMLengine.Case(package=self.package)
                self.case.root()['version'] = self.XML_DOC_VERSION
                self.initCase()
                title = self.tr("New parameters set") + \
                         " - " + self.tr(self.package.code_name) + self.tr(" GUI") \
                         + " - " + self.package.version
                self.setWindowTitle(title)

                self.Browser.configureTree(self.case)
                self.dockWidgetBrowserDisplay(True)

                self.case['salome'] = self.salome
                self.scrollArea.setWidget(self.displayFisrtPage())
                self.case['saved'] = "yes"

                self.connect(self.case, SIGNAL("undo"), self.slotUndoRedoView)
        else:
            MainView(cmd_package=self.package, cmd_case="new case").show()


    def fileAlreadyLoaded(self, f):
        """
        private method

        check if the file to load is not already loaded

        @type fname: C{str}
        @param fname: file name to load
        @return: C{True} or C{False}
        """
        for win in MainView.Instances:
            if isAlive(win) and hasattr(win, 'case') \
               and win.case['xmlfile'] == f:
                win.activateWindow()
                win.raise_()
                return True
        return False


    def loadRecentFile(self, file_name=None):
        """
        private slot

        reload an existing recent file

        @type fname: C{str}
        @param fname: file name to load
        """
        # reload  from File menu
        if file_name is None:
            action = self.sender()
            if isinstance(action, QAction):
                file_name = unicode(action.data().toString())
                if not self.okToContinue():
                    return
            else:
                return

        # check if the file to load is not already loaded
        if hasattr(self, 'case'):
            if not self.fileAlreadyLoaded(file_name):
                MainView(cmd_package=self.package, cmd_case = file_name).show()
        else:
            self.loadFile(file_name)


    def loadingAborted(self, msg, fn):
        """Show a message window dialog.
        Delete the case if it is already loaded, but non conformal.

        @param msg text to display in the popup window
        @param fn name of the file pf parameters
        """
        msg += self.tr("\n\nThe loading of %s is aborted." % fn)
        title = self.tr("File of parameters reading error")

        QMessageBox.critical(self, title, msg)

        if hasattr(self, 'case'):
            delattr(self, 'case')


    def loadFile(self, file_name=None):
        """
        Private method

        Load an existing file.

        @type fname: C{str}
        @param fname: file name to load
        """
        file_name = os.path.abspath(str(file_name))
        fn = os.path.basename(file_name)
        log.debug("loadFile -> %s" % file_name)

        # XML syntax checker

        msg =  XMLengine.xmlChecker(file_name)
        if msg:
            self.loadingAborted(msg, fn)
            return

        # Instantiate a new case

        try:
            self.case = XMLengine.Case(package=self.package, file_name=file_name)
        except:
            msg = self.tr("This file is not in accordance with XML specifications.")
            self.loadingAborted(msg, fn)
            return

        # Check if the root node is the good one

        if self.case.xmlRootNode().tagName != self.package.code_name + "_GUI":
            msg = self.tr("This file seems not to be a %s file of parameters.\n\n"  \
                          "XML root node found: %s" % \
                          (self.package.code_name, self.case.xmlRootNode().tagName))
            self.loadingAborted(msg, fn)
            return

        if self.case.root()['version'] != self.XML_DOC_VERSION:
            msg = self.tr("The syntax version %s of this file of parameters does\n" \
                          "not match with the version required y the GUI: %s." %    \
                          (self.case.root()['version'], self.XML_DOC_VERSION) )
            self.loadingAborted(msg, fn)
            return

        # Cleaning the '\n' and '\t' from file_name (except in formula)
        self.case.xmlCleanAllBlank(self.case.xmlRootNode())

        # we consider we are in calculation mode when we open an xml file
        self.case['prepro'] = False

        msg = self.initCase()
        if msg:
            self.loadingAborted(msg, fn)
            return

        # All checks are fine, wan can continue...

        self.addRecentFile(fn)
        self.Browser.configureTree(self.case)
        self.dockWidgetBrowserDisplay(True)

        self.case['salome'] = self.salome

        # Update the case and the StudyIdBar
        self.case['xmlfile'] = file_name
        title = fn + " - " + self.tr(self.package.code_name) + self.tr(" GUI") \
                   + " - " + self.package.version
        self.setWindowTitle(title)

        msg = self.tr("Loaded: %s" % fn)
        self.statusbar.showMessage(msg, 2000)

        self.scrollArea.setWidget(self.displayFisrtPage())

        self.case['saved'] = "yes"

        # Update the Tree Navigator layout

        self.connect(self.case, SIGNAL("undo"), self.slotUndoRedoView)
        self.actionPrepro.setEnabled(True)
        self.actionCalculation.setEnabled(True)


    @pyqtSignature("")
    def fileOpen(self):
        """
        public slot

        open an existing file
        """
        msg = self.tr("Opening an existing case.")
        self.statusbar.showMessage(msg, 2000)

        title = self.tr("Open existing file.")

        if hasattr(self, 'case') and os.path.isdir(self.case['data_path']):
            path = self.case['data_path']
        else:
            path = os.getcwd()
            dataPath = os.path.join(path, "..", "DATA")
            if os.path.isdir(dataPath): path = dataPath

        filetypes = self.tr(self.package.code_name) + self.tr(" GUI files (*.xml);;""All Files (*)")

        file_name, _selfilter = getopenfilename(self, title, path, filetypes)

        if not file_name:
            msg = self.tr("Loading aborted")
            self.statusbar.showMessage(msg, 2000)
            file_name = None
            return
        else:
            file_name = str(file_name)
            log.debug("fileOpen -> %s" % file_name)

        if hasattr(self, 'case'):
            if not self.fileAlreadyLoaded(file_name):
                MainView(cmd_package=self.package, cmd_case = file_name).show()
        else:
            self.loadFile(file_name)

        self.statusbar.clearMessage()


    @pyqtSignature("")
    def openXterm(self):
        """
        public slot

        open an xterm window
        """
        if sys.platform.startswith("win"):
            cmd = "start cmd"
        else:
            if hasattr(self, 'case'):
                cmd = "cd  " + self.case['case_path'] + " && xterm -sb &"
            else:
                cmd = "xterm -sb &"

        p = subprocess.Popen(cmd,
                             shell=True,
                             stdout=subprocess.PIPE,
                             stderr=subprocess.PIPE,
                             universal_newlines=True)


    @pyqtSignature("")
    def displayCase(self):
        """
        public slot

        print the case (xml file) on the current terminal
        """
        if hasattr(self, 'case'):
            dialog = XMLEditorView(self, self.case)
            dialog.show()


    def updateStudyId(self):
        """
        private method

        update the Study Identity dock widget
        """
        study     = self.case.root().xmlGetAttribute('study')
        case      = self.case.root().xmlGetAttribute('case')
        file_name = XMLengine._encode(self.case['xmlfile'])
        self.Id.setStudyName(study)
        self.Id.setCaseName(case)
        self.Id.setXMLFileName(file_name)


    @pyqtSignature("")
    def fileSave(self):
        """
        public slot

        save the current case
        """
        log.debug("fileSave()")

        if not hasattr(self, 'case'):
            return

        file_name = self.case['xmlfile']
        log.debug("fileSave(): %s" % file_name)
        if not file_name:
            self.fileSaveAs()
            return

        log.debug("fileSave(): %s" % os.path.dirname(file_name))
        log.debug("fileSave(): %s" % os.access(os.path.dirname(file_name), os.W_OK))
        if not os.access(os.path.dirname(file_name), os.W_OK):
            title = self.tr("Save error")
            msg   = self.tr("Failed to write %s " % file_name)
            QMessageBox.critical(self, title, msg)
            msg = self.tr("Saving aborted")
            self.statusbar.showMessage(msg, 2000)
            return

        self.updateStudyId()
        self.case.xmlSaveDocument()
        self.batchFileSave()

        # force to blank after save
        self.case['undo'] = []
        self.case['redo'] = []

        self.slotUndoRedoView()

        log.debug("fileSave(): ok")

        msg = self.tr("%s saved" % file_name)
        self.statusbar.showMessage(msg, 2000)


    @pyqtSignature("")
    def fileSaveAs(self):
        """
        public slot

        save the current case with a new name
        """
        log.debug("fileSaveAs()")

        if hasattr(self,'case'):
            filetypes = self.tr(self.package.code_name) + self.tr(" GUI files (*.xml);;""All Files (*)")
            fname, _selfilter = getsavefilename(self,
                                                self.tr("Save File As"),
                                                self.case['data_path'],
                                                filetypes)

            if fname:
                f = str(fname)
                self.case['xmlfile'] = f
                self.addRecentFile(f)
                self.fileSave()
                self.updateStudyId()
                self.case.xmlSaveDocument()
                self.batchFileSave()
                title = os.path.basename(self.case['xmlfile']) + " - " + self.tr(self.package.code_name) + self.tr(" GUI") \
                     + " - " + self.package.version
                self.setWindowTitle(title)

                # force to blank after save
                self.case['undo'] = []
                self.case['redo'] = []

                self.slotUndoRedoView()

            else:
                msg = self.tr("Saving aborted")
                self.statusbar.showMessage(msg, 2000)


    def displayManual(self, pkg, manual, reader = None):
        """
        private method

        open a manual
        """
        argv_info = ['--guide']
        argv_info.append(manual)
        cs_info.main(argv_info, pkg)


    def initializeBatchRunningWindow(self):
        """
        initializes variables concerning the display of batchrunning
        """
        self.IdPthMdl = IdentityAndPathesModel(self.case)
        fic = self.IdPthMdl.getXmlFileName()

        if not fic:
            file_name = os.getcwd()
            if os.path.basename(f) == 'DATA': file_name = os.path.dirname(file_name)
            self.IdPthMdl.setCasePath(file_name)
        else:
            file_dir = os.path.split(fic)[0]
            if file_dir:
                self.IdPthMdl.setCasePath(os.path.split(file_dir)[0])
                if not os.path.basename(file_dir) == 'DATA':
                    self.IdPthMdl.setCasePath(file_dir)
            else:
                file_dir = os.path.split(os.getcwd())[0]
                self.IdPthMdl.setCasePath(file_dir)

        for p, rep in [('data_path',     'DATA'),
                       ('resu_path',     'RESU'),
                       ('user_src_path', 'SRC'),
                       ('scripts_path',  'SCRIPTS')]:
            self.IdPthMdl.setPathI(p, os.path.join(file_dir, rep))
        self.IdPthMdl.setRelevantSubdir("yes", "")

        self.IdPthMdl.setPathI('mesh_path',
                               os.path.join(os.path.abspath(os.path.split(file_dir)[0],
                                                            'MESH')))
        self.case['runcase'] = cs_runcase.runcase(os.path.join(self.case['scripts_path'],
                                                               self.batch_file), package=self.package)
        del IdentityAndPathesModel

        self.updateStudyId()


    @pyqtSignature("")
    def batchFileSave(self):
        """
        public slot

        save the current case
        """
        log.debug("batchFileSave()")

        if not hasattr(self, 'case'):
            return

        if self.case['runcase']:

            parameters = os.path.basename(self.case['xmlfile'])

            self.case['runcase'].set_parameters(parameters)
            self.case['runcase'].save()

        else:

            try:
                node_models = self.case.xmlGetNode('thermophysical_models')
                node_cht = node_models.xmlGetNode('conjugate_heat_transfer')
                node_syr = node_cht.xmlGetNode('external_coupling')
                if len(node_syr.xmlGetNodeList('syrthes')) > 0:
                    msg = "The Calculation management/Prepare batch page should be " \
                        + "visited before saving so that the script file is updated " \
                        + "relative to the XML file."
                    QMessageBox.warning(self, self.package.code_name + ' Interface', msg)
            except Exception:
                pass


    @pyqtSignature("const QModelIndex &")
    def displayNewPage(self, index):
        """
        private slot

        display a new page when the Browser send the order

        @type index: C{QModelIndex}
        @param index: index of the item in the C{QTreeView} clicked in the browser
        """
        # stop if the entry is a folder or a file

        if self.Browser.isFolder(): return

        # warning and stop if is no case
        if not hasattr(self, 'case'):
            log.debug("displayNewPage(): no attr. 'case', return ")

            msg = self.tr("You have to create a new case or load\n"\
                          "an existing case before selecting an item")
            w = QMessageBox(self)
            w.information(self,
                          self.tr("Warning"),
                          msg,
                          self.tr('OK'))
            return

        self.page = self.Browser.display(self,
                                         self.case,
                                         self.statusbar,
                                         self.Id,
                                         self.Browser)

        if self.page is not None:
            self.scrollArea.setWidget(self.page)

        else:
            log.debug("displayNewPage() self.page == None")
            raise


    @pyqtSignature("")
    def displayAbout(self):
        """
        public slot

        the About dialog window shows:
         - title
         - version
         - contact
        """
        msg = self.package.code_name + "\n"                 +\
              "version " + self.package.version + "\n\n"    +\
              "For information about this application "     +\
              "please contact:\n\n"                         +\
              self.package.bugreport + "\n\n"               +\
              "Please visit our site:\n"                    +\
              self.package.url
        QMessageBox.about(self, self.package.name + ' Interface', msg)


    @pyqtSignature("")
    def displayLicence(self):
        """
        public slot

        GNU GPL license dialog window
        """
        QMessageBox.about(self, self.package.code_name + ' Interface', "see COPYING file") # TODO


    @pyqtSignature("")
    def displayConfig(self):
        """
        public slot

        configuration information window
        """
        QMessageBox.about(self, self.package.code_name + ' Interface', "see config.py") # TODO



    @pyqtSignature("")
    def setColor(self):
        """
        public slot

        choose GUI color
        """
        c = self.palette().color(QPalette.Window)
        color = QColorDialog.getColor(c, self)
        if color.isValid():
            app = QCoreApplication.instance()
            if not self.palette_default:
                self.palette_default = QPalette().resolve(self.palette())
            app.setPalette(QPalette(color))
            settings = QSettings()
            settings.setValue("MainWindow/Color",
                              self.palette().color(QPalette.Window).name())


    @pyqtSignature("")
    def setFontSize(self):
        """
        public slot

        choose GUI font
        """
        font, ok = QFontDialog.getFont(self)
        log.debug("setFont -> %s" % ok)
        if ok:
            if not self.font_default:
                self.font_default = self.font()
            self.setFont(font)
            app = QCoreApplication.instance()
            app.setFont(font)
            settings = QSettings()
            settings.setValue("MainWindow/Font",
                              self.font().toString())


    @pyqtSignature("")
    def restoreStyleDefaults(self):
        """
        public slot

        Restore default style.
        """

        reply = QMessageBox.question(self, "Restore defaults",
                                     "Restore default color and font ?",
                                     QMessageBox.Yes | QMessageBox.No)
        if reply == QMessageBox.Yes:
            app = QCoreApplication.instance()
            if self.palette_default:
                app.setPalette(self.palette_default)
            if self.font_default:
                print(self.font_default)
                print(self.font())
                self.setFont(self.font_default)
                app.setFont(self.font_default)
            settings = QSettings()
            settings.remove("MainWindow/Color")
            settings.remove("MainWindow/Font")


    def tr(self, text):
        """
        private method

        translation

        @param text: text to translate
        @return: translated text
        """
        return text

#-------------------------------------------------------------------------------
# Main Window for Code_Saturne
#-------------------------------------------------------------------------------

class MainViewSaturne(QMainWindow, Ui_MainForm, MainView):

    def __new__(cls, cmd_package = None, cmd_case = "", cmd_salome = None):
        return super(MainViewSaturne, cls). __new__(cls, cmd_package, cmd_case, cmd_salome)


    def __init__(self,
                 cmd_package      = None,
                 cmd_case         = "",
                 cmd_salome       = None):
        """
        Initializes a Main Window for a new document:
          1. finish the Main Window layout
          2. connection betwenn signal and slot
          3. Ctrl+C signal handler
          4. create some instance variables
          5. restore system settings

        @type cmd_case:
        @param cmd_case:
        """
        QMainWindow.__init__(self)
        Ui_MainForm.__init__(self)

        self.setupUi(self)

        # create some instance variables

        self.cmd_case    = cmd_case
        self.salome      = cmd_salome
        self.batch_file  = cmd_package.runcase
        self.package     = cmd_package

        self.XML_DOC_VERSION = XML_DOC_VERSION

        self.Browser = BrowserView()
        self.ui_initialize()

        self.connect(self.displayCSManualAction,   SIGNAL("triggered()"), self.displayCSManual)
        self.connect(self.displayCSTutorialAction, SIGNAL("triggered()"), self.displayCSTutorial)
        self.connect(self.displayCSKernelAction,   SIGNAL("triggered()"), self.displayCSKernel)
        self.connect(self.displayCSRefcardAction,  SIGNAL("triggered()"), self.displayCSRefcard)
        self.connect(self.displayCSDoxygenAction,  SIGNAL("triggered()"), self.displayCSDoxygen)
        self.connect(self.actionUndo,              SIGNAL("activated()"), self.slotUndo)
        self.connect(self.actionRedo,              SIGNAL("activated()"), self.slotRedo)
        self.connect(self.actionPrepro,            SIGNAL("activated()"), self.slotPreproMode)
        self.connect(self.actionCalculation,       SIGNAL("activated()"), self.slotCalculationMode)

        docdir = self.package.get_dir('docdir')
        if os.path.isdir(docdir):
            liste = os.listdir(docdir)
        else:
            liste = []

        if 'user.pdf' not in liste:
            self.displayCSManualAction.setEnabled(False)
        if 'theory.pdf' not in liste:
            self.displayCSKernelAction.setEnabled(False)
        if 'refcard.pdf' not in liste:
            self.displayCSRefcardAction.setEnabled(False)
        if 'doxygen' not in liste:
            self.displayCSDoxygenAction.setEnabled(False)
        self.displayNCManualAction.setVisible(False)


    def initCase(self):
        """
        Initializes the new case with default xml nodes.
        If previous case, just check if all mandatory nodes exist.
        """
        return XMLinit(self.case).initialize(self.case['prepro'])


    def displayWelcomePage(self):
        """
        Display the Welcome (and the default) page
        """
        self.page = WelcomeView()
        self.scrollArea.setWidget(self.page)


    def displayFisrtPage(self):
        """
        Display the first page if a file of parameters (new or previous) is loaded
        """
        self.case['current_tab'] = 0
        self.case['current_index'] = None
        return displaySelectedPage('Identity and paths',
                                    self,
                                    self.case,
                                    stbar=self.statusbar,
                                    study=self.Id,
                                    tree=self.Browser)


    @pyqtSignature("")
    def displayCSManual(self):
        """
        public slot

        open the user manual
        """
        self.displayManual(self.package, 'user')


    @pyqtSignature("")
    def displayCSTutorial(self):
        """
        public slot

        open the tutorial for Code_Saturne
        """
        msg = "See " + self.package.url + " web site for tutorials."
        QMessageBox.about(self, self.package.name + ' Interface', msg)


    @pyqtSignature("")
    def displayCSKernel(self):
        """
        public slot

        open the theory and programmer's guide
        """
        self.displayManual(self.package, 'theory')


    @pyqtSignature("")
    def displayCSRefcard(self):
        """
        public slot

        open the quick reference card for Code_Saturne
        """
        self.displayManual(self.package, 'refcard')


    @pyqtSignature("")
    def displayCSDoxygen(self):
        """
        public slot

        open the quick doxygen for Code_Saturne
        """
        self.displayManual(self.package, 'Doxygen')


    @pyqtSignature("")
    def slotUndo(self):
        """
        public slot
        """
        if self.case['undo'] != []:
            last_record = self.case['undo'].pop()
            self.case.record_func_prev = None
            self.case.xml_prev = ""
            self.case['redo'].append([last_record[0],
                                      self.case.toString(),
                                      last_record[2],
                                      last_record[3]])

            self.case.parseString(last_record[1])
            self.Browser.activeSelectedPage(last_record[2])
            self.Browser.configureTree(self.case)
            self.case['current_index'] = last_record[2]
            self.case['current_tab'] = last_record[3]

            self.slotUndoRedoView()

            p = displaySelectedPage(last_record[0],
                                    self,
                                    self.case,
                                    stbar=self.statusbar,
                                    study=self.Id,
                                    tree=self.Browser)
            self.scrollArea.setWidget(p)


    @pyqtSignature("")
    def slotRedo(self):
        """
        public slot
        """
        if self.case['redo'] != []:
            last_record = self.case['redo'].pop()
            self.case.record_func_prev = None
            self.case.xml_prev = ""
            self.case['undo'].append([last_record[0],
                                      self.case.toString(),
                                      last_record[2],
                                      last_record[3]])

            self.case.parseString(last_record[1])
            self.Browser.activeSelectedPage(last_record[2])
            self.Browser.configureTree(self.case)
            self.case['current_index'] = last_record[2]
            self.case['current_tab'] = last_record[3]

            self.slotUndoRedoView()

            p = displaySelectedPage(last_record[0],
                                    self,
                                    self.case,
                                    stbar=self.statusbar,
                                    study=self.Id,
                                    tree=self.Browser)
            self.scrollArea.setWidget(p)


    @pyqtSignature("")
    def slotPreproMode(self):
        """
        mode prepro slot
        """
        self.case['prepro'] = True
        self.initCase()
        self.Browser.configureTree(self.case)


    @pyqtSignature("")
    def slotCalculationMode(self):
        """
        mode calculation slot
        """
        self.case['prepro'] = False
        self.initCase()
        self.Browser.configureTree(self.case)


    @pyqtSignature("")
    def slotUndoRedoView(self):
        if self.case['undo']:
            self.actionUndo.setEnabled(True)
        else:
            self.actionUndo.setEnabled(False)

        if self.case['redo']:
            self.actionRedo.setEnabled(True)
        else:
            self.actionRedo.setEnabled(False)


#-------------------------------------------------------------------------------

def isAlive(qobj):
    """
    return True if the object qobj exist

    @param qobj: the name of the attribute
    @return: C{True} or C{False}
    """
    import sip
    try:
        sip.unwrapinstance(qobj)
    except RuntimeError:
        return False
    return True

#-------------------------------------------------------------------------------
# End
#-------------------------------------------------------------------------------
