import sys
import os
import subprocess
import logging
import json
import webbrowser

from PyQt4 import QtCore
from PyQt4 import QtGui
from PyQt4 import QtWebKit

from twisted.internet import reactor
# General SAS imports
from sas.qtgui.Utilities.ConnectionProxy import ConnectionProxy
from sas.qtgui.Utilities.SasviewLogger import XStream

import sas.qtgui.Utilities.LocalConfig as LocalConfig
import sas.qtgui.Utilities.GuiUtils as GuiUtils

import sas.qtgui.Utilities.ObjectLibrary as ObjectLibrary
from sas.qtgui.MainWindow.UI.AcknowledgementsUI import Ui_Acknowledgements
from sas.qtgui.MainWindow.AboutBox import AboutBox
from sas.qtgui.MainWindow.WelcomePanel import WelcomePanel

from sas.qtgui.MainWindow.DataManager import DataManager

from sas.qtgui.Calculators.SldPanel import SldPanel
from sas.qtgui.Calculators.DensityPanel import DensityPanel
from sas.qtgui.Calculators.KiessigPanel import KiessigPanel
from sas.qtgui.Calculators.SlitSizeCalculator import SlitSizeCalculator
from sas.qtgui.Calculators.GenericScatteringCalculator import GenericScatteringCalculator
from sas.qtgui.Calculators.ResolutionCalculatorPanel import ResolutionCalculatorPanel
from sas.qtgui.Calculators.DataOperationUtilityPanel import DataOperationUtilityPanel

# Perspectives
import sas.qtgui.Perspectives as Perspectives
from sas.qtgui.Perspectives.Fitting.FittingPerspective import FittingWindow
from sas.qtgui.MainWindow.DataExplorer import DataExplorerWindow

class Acknowledgements(QtGui.QDialog, Ui_Acknowledgements):
    def __init__(self, parent=None):
        QtGui.QDialog.__init__(self, parent)
        self.setupUi(self)

class GuiManager(object):
    """
    Main SasView window functionality
    """

    def __init__(self, parent=None):
        """
        Initialize the manager as a child of MainWindow.
        """
        self._workspace = parent
        self._parent = parent

        # Add signal callbacks
        self.addCallbacks()

        # Create the data manager
        # TODO: pull out all required methods from DataManager and reimplement
        self._data_manager = DataManager()

        # Create action triggers
        self.addTriggers()

        # Populate menus with dynamic data
        #
        # Analysis/Perspectives - potentially
        # Window/current windows
        #
        # Widgets
        #
        # Current displayed perspective
        self._current_perspective = None

        # Invoke the initial perspective
        self.perspectiveChanged("Fitting")

        self.addWidgets()

        # Fork off logging messages to the Log Window
        XStream.stdout().messageWritten.connect(self.listWidget.insertPlainText)
        XStream.stderr().messageWritten.connect(self.listWidget.insertPlainText)

        # Log the start of the session
        logging.info(" --- SasView session started ---")
        # Log the python version
        logging.info("Python: %s" % sys.version)

        # Set up the status bar
        self.statusBarSetup()

        # Show the Welcome panel
        self.welcomePanel = WelcomePanel()
        self._workspace.workspace.addWindow(self.welcomePanel)

        # Current help file
        self._helpView = QtWebKit.QWebView()
        # Needs URL like path, so no path.join() here
        self._helpLocation = GuiUtils.HELP_DIRECTORY_LOCATION + "/index.html"

        # Current tutorial location
        self._tutorialLocation = os.path.abspath(os.path.join(GuiUtils.HELP_DIRECTORY_LOCATION,
                                              "_downloads",
                                              "Tutorial.pdf"))
    def addWidgets(self):
        """
        Populate the main window with widgets

        TODO: overwrite close() on Log and DR widgets so they can be hidden/shown
        on request
        """
        # Add FileDialog widget as docked
        self.filesWidget = DataExplorerWindow(self._parent, self, manager=self._data_manager)
        ObjectLibrary.addObject('DataExplorer', self.filesWidget)

        self.dockedFilesWidget = QtGui.QDockWidget("Data Explorer", self._workspace)
        self.dockedFilesWidget.setWidget(self.filesWidget)

        # Disable maximize/minimize and close buttons
        self.dockedFilesWidget.setFeatures(QtGui.QDockWidget.NoDockWidgetFeatures)
        self._workspace.addDockWidget(QtCore.Qt.LeftDockWidgetArea,
                                      self.dockedFilesWidget)

        # Add the console window as another docked widget
        self.logDockWidget = QtGui.QDockWidget("Log Explorer", self._workspace)
        self.logDockWidget.setObjectName("LogDockWidget")
        self.listWidget = QtGui.QTextBrowser()
        self.logDockWidget.setWidget(self.listWidget)
        self._workspace.addDockWidget(QtCore.Qt.BottomDockWidgetArea,
                                      self.logDockWidget)

        # Add other, minor widgets
        self.ackWidget = Acknowledgements()
        self.aboutWidget = AboutBox()

        # Add calculators - floating for usability
        self.SLDCalculator = SldPanel(self)
        self.DVCalculator = DensityPanel(self)
        self.KIESSIGCalculator = KiessigPanel(self)
        self.SlitSizeCalculator = SlitSizeCalculator(self)
        self.GENSASCalculator = GenericScatteringCalculator(self)
        self.ResolutionCalculator = ResolutionCalculatorPanel(self)
        self.DataOperation = DataOperationUtilityPanel(self)

    def statusBarSetup(self):
        """
        Define the status bar.
        | <message label> .... | Progress Bar |

        Progress bar invisible until explicitly shown
        """
        self.progress = QtGui.QProgressBar()
        self._workspace.statusbar.setSizeGripEnabled(False)

        self.statusLabel = QtGui.QLabel()
        self.statusLabel.setText("Welcome to SasView")
        self._workspace.statusbar.addPermanentWidget(self.statusLabel, 1)
        self._workspace.statusbar.addPermanentWidget(self.progress, stretch=0)
        self.progress.setRange(0, 100)
        self.progress.setValue(0)
        self.progress.setTextVisible(True)
        self.progress.setVisible(False)

    def fileWasRead(self, data):
        """
        Callback for fileDataReceivedSignal
        """
        pass

    def workspace(self):
        """
        Accessor for the main window workspace
        """
        return self._workspace.workspace

    def perspectiveChanged(self, perspective_name):
        """
        Respond to change of the perspective signal
        """
        # Close the previous perspective
        if self._current_perspective:
            self._current_perspective.setClosable()
            self._current_perspective.close()
        # Default perspective
        self._current_perspective = Perspectives.PERSPECTIVES[str(perspective_name)](parent=self)

        self._workspace.workspace.addWindow(self._current_perspective)
        # Resize to the workspace height
        workspace_height = self._workspace.workspace.sizeHint().height()
        perspective_size = self._current_perspective.sizeHint()
        if workspace_height < perspective_size.height:
            perspective_width = perspective_size.width()
            self._current_perspective.resize(perspective_width, workspace_height-10)
        self._current_perspective.show()

    def updatePerspective(self, data):
        """
        Update perspective with data sent.
        """
        assert isinstance(data, list)
        if self._current_perspective is not None:
            self._current_perspective.setData(data.values())
        else:
            msg = "No perspective is currently active."
            logging.info(msg)

    def communicator(self):
        """ Accessor for the communicator """
        return self.communicate

    def perspective(self):
        """ Accessor for the perspective """
        return self._current_perspective

    def updateProgressBar(self, value):
        """
        Update progress bar with the required value (0-100)
        """
        assert -1 <= value <= 100
        if value == -1:
            self.progress.setVisible(False)
            return
        if not self.progress.isVisible():
            self.progress.setTextVisible(True)
            self.progress.setVisible(True)

        self.progress.setValue(value)

    def updateStatusBar(self, text):
        """
        Set the status bar text
        """
        self.statusLabel.setText(text)

    def createGuiData(self, item, p_file=None):
        """
        Access the Data1D -> plottable Data1D conversion
        """
        return self._data_manager.create_gui_data(item, p_file)

    def setData(self, data):
        """
        Sends data to current perspective
        """
        if self._current_perspective is not None:
            self._current_perspective.setData(data.values())
        else:
            msg = "Guiframe does not have a current perspective"
            logging.info(msg)

    def quitApplication(self):
        """
        Close the reactor and exit nicely.
        """
        # Display confirmation messagebox
        quit_msg = "Are you sure you want to exit the application?"
        reply = QtGui.QMessageBox.question(
            self._parent,
            'Information',
            quit_msg,
            QtGui.QMessageBox.Yes,
            QtGui.QMessageBox.No)

        # Exit if yes
        if reply == QtGui.QMessageBox.Yes:
            reactor.callFromThread(reactor.stop)
            return True

        return False

    def checkUpdate(self):
        """
        Check with the deployment server whether a new version
        of the application is available.
        A thread is started for the connecting with the server. The thread calls
        a call-back method when the current version number has been obtained.
        """
        version_info = {"version": "0.0.0"}
        c = ConnectionProxy(LocalConfig.__update_URL__, LocalConfig.UPDATE_TIMEOUT)
        response = c.connect()
        if response is None:
            return
        try:
            content = response.read().strip()
            logging.info("Connected to www.sasview.org. Latest version: %s"
                            % (content))
            version_info = json.loads(content)
            self.processVersion(version_info)
        except ValueError, ex:
            logging.info("Failed to connect to www.sasview.org:", ex)

    def processVersion(self, version_info):
        """
        Call-back method for the process of checking for updates.
        This methods is called by a VersionThread object once the current
        version number has been obtained. If the check is being done in the
        background, the user will not be notified unless there's an update.

        :param version: version string
        """
        try:
            version = version_info["version"]
            if version == "0.0.0":
                msg = "Could not connect to the application server."
                msg += " Please try again later."
                self.communicate.statusBarUpdateSignal.emit(msg)

            elif cmp(version, LocalConfig.__version__) > 0:
                msg = "Version %s is available! " % str(version)
                if "download_url" in version_info:
                    webbrowser.open(version_info["download_url"])
                else:
                    webbrowser.open(LocalConfig.__download_page__)
                self.communicate.statusBarUpdateSignal.emit(msg)
            else:
                msg = "You have the latest version"
                msg += " of %s" % str(LocalConfig.__appname__)
                self.communicate.statusBarUpdateSignal.emit(msg)
        except:
            msg = "guiframe: could not get latest application"
            msg += " version number\n  %s" % sys.exc_value
            logging.error(msg)
            msg = "Could not connect to the application server."
            msg += " Please try again later."
            self.communicate.statusBarUpdateSignal.emit(msg)

    def addCallbacks(self):
        """
        Method defining all signal connections for the gui manager
        """
        self.communicate = GuiUtils.Communicate()
        self.communicate.fileDataReceivedSignal.connect(self.fileWasRead)
        self.communicate.statusBarUpdateSignal.connect(self.updateStatusBar)
        self.communicate.updatePerspectiveWithDataSignal.connect(self.updatePerspective)
        self.communicate.progressBarUpdateSignal.connect(self.updateProgressBar)
        self.communicate.perspectiveChangedSignal.connect(self.perspectiveChanged)
        self.communicate.updateTheoryFromPerspectiveSignal.connect(self.updateTheoryFromPerspective)
        self.communicate.plotRequestedSignal.connect(self.showPlot)
        self.communicate.updateModelFromDataOperationPanelSignal.connect(self.updateModelFromDataOperationPanel)

    def addTriggers(self):
        """
        Trigger definitions for all menu/toolbar actions.
        """
        # File
        self._workspace.actionLoadData.triggered.connect(self.actionLoadData)
        self._workspace.actionLoad_Data_Folder.triggered.connect(self.actionLoad_Data_Folder)
        self._workspace.actionOpen_Project.triggered.connect(self.actionOpen_Project)
        self._workspace.actionOpen_Analysis.triggered.connect(self.actionOpen_Analysis)
        self._workspace.actionSave.triggered.connect(self.actionSave)
        self._workspace.actionSave_Analysis.triggered.connect(self.actionSave_Analysis)
        self._workspace.actionQuit.triggered.connect(self.actionQuit)
        # Edit
        self._workspace.actionUndo.triggered.connect(self.actionUndo)
        self._workspace.actionRedo.triggered.connect(self.actionRedo)
        self._workspace.actionCopy.triggered.connect(self.actionCopy)
        self._workspace.actionPaste.triggered.connect(self.actionPaste)
        self._workspace.actionReport.triggered.connect(self.actionReport)
        self._workspace.actionReset.triggered.connect(self.actionReset)
        self._workspace.actionExcel.triggered.connect(self.actionExcel)
        self._workspace.actionLatex.triggered.connect(self.actionLatex)

        # View
        self._workspace.actionShow_Grid_Window.triggered.connect(self.actionShow_Grid_Window)
        self._workspace.actionHide_Toolbar.triggered.connect(self.actionHide_Toolbar)
        self._workspace.actionStartup_Settings.triggered.connect(self.actionStartup_Settings)
        self._workspace.actionCategry_Manager.triggered.connect(self.actionCategry_Manager)
        # Tools
        self._workspace.actionData_Operation.triggered.connect(self.actionData_Operation)
        self._workspace.actionSLD_Calculator.triggered.connect(self.actionSLD_Calculator)
        self._workspace.actionDensity_Volume_Calculator.triggered.connect(self.actionDensity_Volume_Calculator)
        self._workspace.actionKeissig_Calculator.triggered.connect(self.actionKiessig_Calculator)
        #self._workspace.actionKIESSING_Calculator.triggered.connect(self.actionKIESSING_Calculator)
        self._workspace.actionSlit_Size_Calculator.triggered.connect(self.actionSlit_Size_Calculator)
        self._workspace.actionSAS_Resolution_Estimator.triggered.connect(self.actionSAS_Resolution_Estimator)
        self._workspace.actionGeneric_Scattering_Calculator.triggered.connect(self.actionGeneric_Scattering_Calculator)
        self._workspace.actionPython_Shell_Editor.triggered.connect(self.actionPython_Shell_Editor)
        self._workspace.actionImage_Viewer.triggered.connect(self.actionImage_Viewer)
        # Fitting
        self._workspace.actionNew_Fit_Page.triggered.connect(self.actionNew_Fit_Page)
        self._workspace.actionConstrained_Fit.triggered.connect(self.actionConstrained_Fit)
        self._workspace.actionCombine_Batch_Fit.triggered.connect(self.actionCombine_Batch_Fit)
        self._workspace.actionFit_Options.triggered.connect(self.actionFit_Options)
        self._workspace.actionFit_Results.triggered.connect(self.actionFit_Results)
        self._workspace.actionChain_Fitting.triggered.connect(self.actionChain_Fitting)
        self._workspace.actionEdit_Custom_Model.triggered.connect(self.actionEdit_Custom_Model)
        # Window
        self._workspace.actionCascade.triggered.connect(self.actionCascade)
        self._workspace.actionTile.triggered.connect(self.actionTile)
        self._workspace.actionArrange_Icons.triggered.connect(self.actionArrange_Icons)
        self._workspace.actionNext.triggered.connect(self.actionNext)
        self._workspace.actionPrevious.triggered.connect(self.actionPrevious)
        # Analysis
        self._workspace.actionFitting.triggered.connect(self.actionFitting)
        self._workspace.actionInversion.triggered.connect(self.actionInversion)
        self._workspace.actionInvariant.triggered.connect(self.actionInvariant)
        # Help
        self._workspace.actionDocumentation.triggered.connect(self.actionDocumentation)
        self._workspace.actionTutorial.triggered.connect(self.actionTutorial)
        self._workspace.actionAcknowledge.triggered.connect(self.actionAcknowledge)
        self._workspace.actionAbout.triggered.connect(self.actionAbout)
        self._workspace.actionCheck_for_update.triggered.connect(self.actionCheck_for_update)

    #============ FILE =================
    def actionLoadData(self):
        """
        Menu File/Load Data File(s)
        """
        self.filesWidget.loadFile()

    def actionLoad_Data_Folder(self):
        """
        Menu File/Load Data Folder
        """
        self.filesWidget.loadFolder()

    def actionOpen_Project(self):
        """
        Menu Open Project
        """
        self.filesWidget.loadProject()

    def actionOpen_Analysis(self):
        """
        """
        print("actionOpen_Analysis TRIGGERED")
        pass

    def actionSave(self):
        """
        Menu Save Project
        """
        self.filesWidget.saveProject()

    def actionSave_Analysis(self):
        """
        """
        print("actionSave_Analysis TRIGGERED")

        pass

    def actionQuit(self):
        """
        Close the reactor, exit the application.
        """
        self.quitApplication()

    #============ EDIT =================
    def actionUndo(self):
        """
        """
        print("actionUndo TRIGGERED")
        pass

    def actionRedo(self):
        """
        """
        print("actionRedo TRIGGERED")
        pass

    def actionCopy(self):
        """
        """
        print("actionCopy TRIGGERED")
        pass

    def actionPaste(self):
        """
        """
        print("actionPaste TRIGGERED")
        pass

    def actionReport(self):
        """
        """
        print("actionReport TRIGGERED")
        pass

    def actionReset(self):
        """
        """
        logging.warning(" *** actionOpen_Analysis logging *******")
        print("actionReset print TRIGGERED")
        sys.stderr.write("STDERR - TRIGGERED")
        pass

    def actionExcel(self):
        """
        """
        print("actionExcel TRIGGERED")
        pass

    def actionLatex(self):
        """
        """
        print("actionLatex TRIGGERED")
        pass

    #============ VIEW =================
    def actionShow_Grid_Window(self):
        """
        """
        print("actionShow_Grid_Window TRIGGERED")
        pass

    def actionHide_Toolbar(self):
        """
        Toggle toolbar vsibility
        """
        if self._workspace.toolBar.isVisible():
            self._workspace.actionHide_Toolbar.setText("Show Toolbar")
            self._workspace.toolBar.setVisible(False)
        else:
            self._workspace.actionHide_Toolbar.setText("Hide Toolbar")
            self._workspace.toolBar.setVisible(True)
        pass

    def actionStartup_Settings(self):
        """
        """
        print("actionStartup_Settings TRIGGERED")
        pass

    def actionCategry_Manager(self):
        """
        """
        print("actionCategry_Manager TRIGGERED")
        pass

    #============ TOOLS =================
    def actionData_Operation(self):
        """
        """
        self.communicate.sendDataToPanelSignal.emit(self._data_manager.get_all_data())

        self.DataOperation.show()

    def actionSLD_Calculator(self):
        """
        """
        self.SLDCalculator.show()

    def actionDensity_Volume_Calculator(self):
        """
        """
        self.DVCalculator.show()

    def actionKiessig_Calculator(self):
        """
        """
        #self.DVCalculator.show()
        self.KIESSIGCalculator.show()

    def actionSlit_Size_Calculator(self):
        """
        """
        self.SlitSizeCalculator.show()

    def actionSAS_Resolution_Estimator(self):
        """
        """
        self.ResolutionCalculator.show()

    def actionGeneric_Scattering_Calculator(self):
        """
        """
        self.GENSASCalculator.show()

    def actionPython_Shell_Editor(self):
        """
        Display the Jupyter console as a docked widget.
        """
        # Import moved here for startup performance reasons
        from sas.qtgui.Utilities.IPythonWidget import IPythonWidget
        terminal = IPythonWidget()

        # Add the console window as another docked widget
        self.ipDockWidget = QtGui.QDockWidget("IPython", self._workspace)
        self.ipDockWidget.setObjectName("IPythonDockWidget")
        self.ipDockWidget.setWidget(terminal)
        self._workspace.addDockWidget(QtCore.Qt.RightDockWidgetArea,
                                      self.ipDockWidget)

    def actionImage_Viewer(self):
        """
        """
        print("actionImage_Viewer TRIGGERED")
        pass

    #============ FITTING =================
    def actionNew_Fit_Page(self):
        """
        Add a new, empty Fit page in the fitting perspective.
        """
        # Make sure the perspective is correct
        per = self.perspective()
        if not isinstance(per, FittingWindow):
            return
        per.addFit(None)

    def actionConstrained_Fit(self):
        """
        """
        print("actionConstrained_Fit TRIGGERED")
        pass

    def actionCombine_Batch_Fit(self):
        """
        """
        print("actionCombine_Batch_Fit TRIGGERED")
        pass

    def actionFit_Options(self):
        """
        """
        if getattr(self._current_perspective, "fit_options_widget"):
            self._current_perspective.fit_options_widget.show()
        pass

    def actionFit_Results(self):
        """
        """
        print("actionFit_Results TRIGGERED")
        pass

    def actionChain_Fitting(self):
        """
        """
        print("actionChain_Fitting TRIGGERED")
        pass

    def actionEdit_Custom_Model(self):
        """
        """
        print("actionEdit_Custom_Model TRIGGERED")
        pass

    #============ ANALYSIS =================
    def actionFitting(self):
        """
        """
        print("actionFitting TRIGGERED")
        pass

    def actionInversion(self):
        """
        """
        print("actionInversion TRIGGERED")
        pass

    def actionInvariant(self):
        """
        """
        print("actionInvariant TRIGGERED")
        pass

    #============ WINDOW =================
    def actionCascade(self):
        """
        Arranges all the child windows in a cascade pattern.
        """
        self._workspace.workspace.cascade()

    def actionTile(self):
        """
        Tile workspace windows
        """
        self._workspace.workspace.tile()

    def actionArrange_Icons(self):
        """
        Arranges all iconified windows at the bottom of the workspace
        """
        self._workspace.workspace.arrangeIcons()

    def actionNext(self):
        """
        Gives the input focus to the next window in the list of child windows.
        """
        self._workspace.workspace.activateNextWindow()

    def actionPrevious(self):
        """
        Gives the input focus to the previous window in the list of child windows.
        """
        self._workspace.workspace.activatePreviousWindow()

    #============ HELP =================
    def actionDocumentation(self):
        """
        Display the documentation

        TODO: use QNetworkAccessManager to assure _helpLocation is valid
        """
        self._helpView.load(QtCore.QUrl(self._helpLocation))
        self._helpView.show()

    def actionTutorial(self):
        """
        Open the tutorial PDF file with default PDF renderer
        """
        # Not terribly safe here. Shell injection warning.
        # isfile() helps but this probably needs a better solution.
        if os.path.isfile(self._tutorialLocation):
            result = subprocess.Popen([self._tutorialLocation], shell=True)

    def actionAcknowledge(self):
        """
        Open the Acknowledgements widget
        """
        self.ackWidget.show()

    def actionAbout(self):
        """
        Open the About box
        """
        # Update the about box with current version and stuff

        # TODO: proper sizing
        self.aboutWidget.show()

    def actionCheck_for_update(self):
        """
        Menu Help/Check for Update
        """
        self.checkUpdate()

    def updateTheoryFromPerspective(self, index):
        """
        Catch the theory update signal from a perspective
        Send the request to the DataExplorer for updating the theory model.
        """
        self.filesWidget.updateTheoryFromPerspective(index)

    def updateModelFromDataOperationPanel(self, new_item, new_datalist_item):
        """
        :param new_item: item to be added to list of loaded files
        :param new_datalist_item:
        """
        if not isinstance(new_item, QtGui.QStandardItem) or \
                not isinstance(new_datalist_item, dict):
            msg = "Wrong data type returned from calculations."
            raise AttributeError, msg

        self.filesWidget.model.appendRow(new_item)
        self._data_manager.add_data(new_datalist_item)

    def showPlot(self, plot):
        """
        Pass the show plot request to the data explorer
        """
        if hasattr(self, "filesWidget"):
            self.filesWidget.displayData(plot)