#***************************************************************************
#*                                                                         *
#*   Copyright (c) 2015 - Qingfeng Xia <qingfeng.xia()eng.ox.ac.uk> *
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#*   This program is free software; you can redistribute it and/or modify  *
#*   it under the terms of the GNU Lesser General Public License (LGPL)    *
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#*   the License, or (at your option) any later version.                   *
#*   for detail see the LICENCE text file.                                 *
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#*   GNU Library General Public License for more details.                  *
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#*   USA                                                                   *
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#***************************************************************************

__title__ = "ViewProvider for FEM mechanical ResultObjectPython"
__author__ = "Qingfeng Xia, Bernd Hahnebach"
__url__ = "http://www.freecadweb.org"

## @package _ViewProviderFemResultMechanical
#  \ingroup FEM
#  \brief FreeCAD ViewProvider for mechanical ResultObjectPython in FEM workbench

import FreeCAD
import FreeCADGui
from PySide import QtGui


class _ViewProviderFemResultMechanical:
    """A View Provider for the FemResultObject Python dervied FemResult class
    """

    def __init__(self, vobj):
        vobj.Proxy = self

    def getIcon(self):
        """after load from FCStd file, self.icon does not exist, return constant path instead"""
        return ":/icons/fem-result.svg"

    def attach(self, vobj):
        self.ViewObject = vobj
        self.Object = vobj.Object

    def updateData(self, obj, prop):
        return

    def onChanged(self, vobj, prop):
        return

    def doubleClicked(self, vobj):
        if FreeCADGui.activeWorkbench().name() != 'FemWorkbench':
            FreeCADGui.activateWorkbench("FemWorkbench")
        doc = FreeCADGui.getDocument(vobj.Object.Document)
        if not doc.getInEdit():
            doc.setEdit(vobj.Object.Name)
        else:
            FreeCAD.Console.PrintError('Active Task Dialog found! Please close this one first!\n')
        return True

    def setEdit(self, vobj, mode=0):
        if hasattr(self.Object, "Mesh") and self.Object.Mesh:
            hide_femmeshes_postpiplines()
            # only show the FEM result mesh
            self.Object.Mesh.ViewObject.show()
            import PyGui._TaskPanelFemResultShow
            taskd = PyGui._TaskPanelFemResultShow._TaskPanelFemResultShow(self.Object)
            taskd.obj = vobj.Object
            FreeCADGui.Control.showDialog(taskd)
            return True
        else:
            error_message = 'FEM: Result object has no appropriate FEM mesh.\n'
            FreeCAD.Console.PrintError(error_message)
            QtGui.QMessageBox.critical(None, 'No result object', error_message)
            return False

    def unsetEdit(self, vobj, mode=0):
        FreeCADGui.Control.closeDialog()
        self.Object.Mesh.ViewObject.hide()  # hide the mesh after result viewing is finished, but do not reset the coloring
        return

    def __getstate__(self):
        return None

    def __setstate__(self, state):
        return None

    def claimChildren(self):
        return [self.Object.Mesh]  # claimChildren needs to return a list !

    def onDelete(self, feature, subelements):
        try:
            for obj in self.claimChildren():
                obj.ViewObject.show()
        except Exception as err:
            FreeCAD.Console.PrintError("Error in onDelete: " + err.message)
        return True


# helper
def hide_femmeshes_postpiplines():
    # hide all visible FEM mesh objects and VTK FemPostPipeline objects
    for o in FreeCAD.ActiveDocument.Objects:
        if o.isDerivedFrom("Fem::FemMeshObject") or o.isDerivedFrom("Fem::FemPostPipeline"):
            o.ViewObject.hide()