# ***************************************************************************
# *                                                                         *
# *   Copyright (c) 2015 - Bernd Hahnebach <bernd@bimstatik.org>            *
# *                                                                         *
# *   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                                                                   *
# *                                                                         *
# ***************************************************************************

__title__ = "_FemShellThicknessTaskPanel"
__author__ = "Bernd Hahnebach"
__url__ = "http://www.freecadweb.org"


import FreeCAD

if FreeCAD.GuiUp:
    import FreeCADGui
    import FemGui
    from PySide import QtGui
    from PySide import QtCore
    from pivy import coin


class _FemShellThicknessTaskPanel:
    '''The TaskPanel for editing References property of FemShellThickness objects'''
    def __init__(self, obj):
        FreeCADGui.Selection.clearSelection()
        self.sel_server = None
        self.obj = obj
        self.references = self.obj.References

        self.form = FreeCADGui.PySideUic.loadUi(FreeCAD.getHomePath() + "Mod/Fem/FemShellThickness.ui")
        QtCore.QObject.connect(self.form.pushButton_Reference, QtCore.SIGNAL("clicked()"), self.add_references)
        self.form.list_References.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
        self.form.list_References.connect(self.form.list_References, QtCore.SIGNAL("customContextMenuRequested(QPoint)"), self.references_list_right_clicked)

        self.rebuild_list_References()

    def accept(self):
        if self.sel_server:
            FreeCADGui.Selection.removeObserver(self.sel_server)
        self.obj.References = self.references
        FreeCADGui.ActiveDocument.resetEdit()
        FreeCAD.ActiveDocument.recompute()
        return True

    def reject(self):
        if self.sel_server:
            FreeCADGui.Selection.removeObserver(self.sel_server)
        FreeCADGui.ActiveDocument.resetEdit()
        return True

    def references_list_right_clicked(self, QPos):
        self.form.contextMenu = QtGui.QMenu()
        menu_item = self.form.contextMenu.addAction("Remove Reference")
        if not self.references:
            menu_item.setDisabled(True)
        self.form.connect(menu_item, QtCore.SIGNAL("triggered()"), self.remove_reference)
        parentPosition = self.form.list_References.mapToGlobal(QtCore.QPoint(0, 0))
        self.form.contextMenu.move(parentPosition + QPos)
        self.form.contextMenu.show()

    def remove_reference(self):
        if not self.references:
            return
        currentItemName = str(self.form.list_References.currentItem().text())
        for ref in self.references:
            refname_to_compare_listentry = ref[0].Name + ':' + ref[1]
            if refname_to_compare_listentry == currentItemName:
                self.references.remove(ref)
        self.rebuild_list_References()

    def add_references(self):
        '''Called if Button add_reference is triggered'''
        # in constraints EditTaskPanel the selection is active as soon as the taskpanel is open
        # here the addReference button EditTaskPanel has to be triggered to start selection mode
        FreeCADGui.Selection.clearSelection()
        # start SelectionObserver and parse the function to add the References to the widget
        self.sel_server = ReferenceShapeSelectionObserver(self.selectionParser)

    def selectionParser(self, selection):
        # print('selection: ', selection[0].Shape.ShapeType, '  ', selection[0].Name, '  ', selection[1])
        if hasattr(selection[0], "Shape"):
            elt = selection[0].Shape.getElement(selection[1])
            if elt.ShapeType == 'Face':
                if selection not in self.references:
                    self.references.append(selection)
                    self.rebuild_list_References()
                else:
                    print(selection[0].Name, '-->', selection[1], ' is already in reference list!')
        else:
            print('Selection has no shape!')

    def rebuild_list_References(self):
        self.form.list_References.clear()
        items = []
        for i in self.references:
            item_name = i[0].Name + ':' + i[1]
            items.append(item_name)
        for listItemName in sorted(items):
            listItem = QtGui.QListWidgetItem(listItemName, self.form.list_References)  # listItem =   is needed


class ReferenceShapeSelectionObserver:
    '''ReferenceShapeSelectionObserver
       started on click  button addReference'''
    def __init__(self, parseSelectionFunction):
        self.parseSelectionFunction = parseSelectionFunction
        FreeCADGui.Selection.addObserver(self)
        FreeCAD.Console.PrintMessage("Select Faces to add them to the list!\n")

    def addSelection(self, docName, objName, sub, pos):
        selected_object = FreeCAD.getDocument(docName).getObject(objName)  # get the obj objName
        self.added_obj = (selected_object, sub)
        if sub:         # on doubleClick the solid is selected and sub will be empty
            self.parseSelectionFunction(self.added_obj)
