#***************************************************************************
#*                                                                         *
#*   Copyright (c) 2011, 2012                                              *  
#*   Jose Luis Cercos Pita <jlcercos@gmail.com>                            *  
#*                                                                         *
#*   This program is free software; you can redistribute it and/or modify  *
#*   it under the terms of the GNU Lesser General Public License (LGPL)    *
#*   as published by the Free Software Foundation; either version 2 of     *
#*   the License, or (at your option) any later version.                   *
#*   for detail see the LICENCE text file.                                 *
#*                                                                         *
#*   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 Library General Public License for more details.                  *
#*                                                                         *
#*   You should have received a copy of the GNU Library General Public     *
#*   License along with this program; if not, write to the Free Software   *
#*   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
#*   USA                                                                   *
#*                                                                         *
#***************************************************************************

# FreeCAD modules
import FreeCAD as App
import FreeCADGui as Gui
# Qt library
from PyQt4 import QtGui,QtCore
# Module
from TankInstance import *
from shipUtils import Paths, Translator

class TaskPanel:
    def __init__(self):
        self.ui = Paths.modulePath() + "/tankCreateTank/TaskPanel.ui"

    def accept(self):
        # Create new ship instance
        obj = App.ActiveDocument.addObject("Part::FeaturePython","Tank")
        ShipTank(obj, self.solid, self.form.level.value(), self.form.dens.value())
        if not obj.IsShipTank:
            msg = Translator.translate("Tank has not been created.\n")
            App.Console.PrintError(msg)
        ViewProviderShipTank(obj.ViewObject)
        App.ActiveDocument.recompute()
        return True

    def reject(self):
        return True

    def clicked(self, index):
        pass

    def open(self):
        pass

    def needsFullSpace(self):
        return True

    def isAllowedAlterSelection(self):
        return False

    def isAllowedAlterView(self):
        return True

    def isAllowedAlterDocument(self):
        return False

    def helpRequested(self):
        pass

    def setupUi(self):
        mw = self.getMainWindow()
        form = mw.findChild(QtGui.QWidget, "TaskPanel")
        form.level = form.findChild(QtGui.QDoubleSpinBox, "Level")
        form.dens  = form.findChild(QtGui.QDoubleSpinBox, "Density")
        self.form = form
        # Initial values
        if self.initValues():
            return True
        self.retranslateUi()
        # Connect Signals and Slots
        QtCore.QObject.connect(form.level, QtCore.SIGNAL("valueChanged(double)"), self.onLevel)
        QtCore.QObject.connect(form.dens , QtCore.SIGNAL("valueChanged(double)"), self.onDens)

    def getMainWindow(self):
        "returns the main window"
        # using QtGui.qApp.activeWindow() isn't very reliable because if another
        # widget than the mainwindow is active (e.g. a dialog) the wrong widget is
        # returned
        toplevel = QtGui.qApp.topLevelWidgets()
        for i in toplevel:
            if i.metaObject().className() == "Gui::MainWindow":
                return i
        raise Exception("No main window found")

    def initValues(self):
        """ Get selected geometry.
        @return False if sucessfully find valid geometry.
        """
        self.solid = None
        solids     = []
        selObjs    = Gui.Selection.getSelection()
        if not selObjs:
            msg = Translator.translate("Tank objects can only be created on top of structure geometry (no object selected).\n")
            App.Console.PrintError(msg)
            msg = Translator.translate("Please create a tank geometry before using this tool.\n")
            App.Console.PrintError(msg)
            return True
        for i in range(0, len(selObjs)):
            solid = selObjs[i]
            if solid.isDerivedFrom('Part::Feature'):
                # Get shape
                shape = solid.Shape
                if not shape:
                    continue
                solid = shape
            if not solid.isDerivedFrom('Part::TopoShape'):
                return None
            # Get shells
            shells = solid.Shells
            if not shells:
                continue
            # Build solids
            for s in shells:
                solids.append(Part.Solid(s))
        if not solids:
            msg = Translator.translate("Ship objects can only be created on top of structure geometry (no solids can't be computed).\n")
            App.Console.PrintError(msg)
            msg = Translator.translate("Please create or download a tank geometry before using this tool\n")
            App.Console.PrintError(msg)
            return True
        self.solid = Part.CompSolid(solids)
        msg = Translator.translate("Ready to work\n")
        App.Console.PrintMessage(msg)
        return False

    def retranslateUi(self):
        """ Set user interface locale strings. 
        """
        self.form.setWindowTitle(Translator.translate("Create a new tank"))
        name = Translator.translate("Filling level") + " (%)"
        self.form.findChild(QtGui.QLabel, "LevelLabel").setText(name)
        name = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" "http://www.w3.org/TR/REC-html40/strict.dtd">\n<html><body>'
        name = name + Translator.translate("Density")
        name = name + '(kg/m<span style=" vertical-align:super;">3</span>)</body></html>'        
        self.form.findChild(QtGui.QLabel, "DensityLabel").setText(name)

    def onLevel(self, value):
        """ Method called when tank filling level has been modified.
        @param value Changed value.
        """
        pass

    def onDens(self, value):
        """ Method called when fluid density has been modified.
        @param value Changed value.
        """
        pass

def createTask():
    panel = TaskPanel()
    Gui.Control.showDialog(panel)
    if panel.setupUi():
        Gui.Control.closeDialog(panel)
        return None
    return panel
