# ***************************************************************************
# *                                                                         *
# *   Copyright (c) 2016 - 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__ = "_TaskPanelFemMeshRegion"
__author__ = "Bernd Hahnebach"
__url__ = "http://www.freecadweb.org"

## @package TaskPanelFemMeshRegion
#  \ingroup FEM

import FreeCAD
import FreeCADGui
from PySide import QtGui
from PySide import QtCore


class _TaskPanelFemMeshRegion:
    '''The TaskPanel for editing References property of FemMeshRegion objects'''
    def __init__(self, obj):
        FreeCADGui.Selection.clearSelection()
        self.sel_server = None
        self.obj = obj
        self.selection_mode_solid = False
        self.selection_mode_std_print_message = "Select Faces, Edges and Vertices by single click on them to add them to the list."
        self.selection_mode_solid_print_message = "Select Solids by single click on a Face or Edge which belongs to the Solid, to add the Solid to the list."

        self.form = FreeCADGui.PySideUic.loadUi(FreeCAD.getHomePath() + "Mod/Fem/PyGui/TaskPanelFemMeshRegion.ui")
        QtCore.QObject.connect(self.form.if_elelen, QtCore.SIGNAL("valueChanged(Base::Quantity)"), self.elelen_changed)
        QtCore.QObject.connect(self.form.rb_standard, QtCore.SIGNAL("toggled(bool)"), self.choose_selection_mode_standard)
        QtCore.QObject.connect(self.form.rb_solid, QtCore.SIGNAL("toggled(bool)"), self.choose_selection_mode_solid)
        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.get_meshregion_props()
        self.update()

    def accept(self):
        self.set_meshregion_props()
        if self.sel_server:
            FreeCADGui.Selection.removeObserver(self.sel_server)
        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 get_meshregion_props(self):
        self.elelen = self.obj.CharacteristicLength
        self.references = []
        if self.obj.References:
            self.tuplereferences = self.obj.References
            self.get_references()

    def set_meshregion_props(self):
        self.obj.References = self.references
        self.obj.CharacteristicLength = self.elelen

    def update(self):
        'fills the widgets'
        self.form.if_elelen.setText(self.elelen.UserString)
        self.rebuild_list_References()

    def elelen_changed(self, base_quantity_value):
        self.elelen = base_quantity_value

    def choose_selection_mode_standard(self, state):
        self.selection_mode_solid = not state
        if self.sel_server and not self.selection_mode_solid:
            print(self.selection_mode_std_print_message)

    def choose_selection_mode_solid(self, state):
        self.selection_mode_solid = state
        if self.sel_server and self.selection_mode_solid:
            print(self.selection_mode_solid_print_message)

    def get_references(self):
        for ref in self.tuplereferences:
            for elem in ref[1]:
                self.references.append((ref[0], elem))

    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
        if self.selection_mode_solid:  # print message on button click
            print_message = self.selection_mode_solid_print_message
        else:
            print_message = self.selection_mode_std_print_message
        import FemSelectionObserver
        self.sel_server = FemSelectionObserver.FemSelectionObserver(self.selectionParser, print_message)

    def selectionParser(self, selection):
        print('selection: ', selection[0].Shape.ShapeType, '  ', selection[0].Name, '  ', selection[1])
        if hasattr(selection[0], "Shape") and selection[1]:
            elt = selection[0].Shape.getElement(selection[1])
            if self.selection_mode_solid:
                # in solid selection mode use edges and faces for selection of a solid
                solid_to_add = None
                if elt.ShapeType == 'Edge':
                    found_edge = False
                    for i, s in enumerate(selection[0].Shape.Solids):
                        for e in s.Edges:
                            if elt.isSame(e):
                                if not found_edge:
                                    solid_to_add = str(i + 1)
                                else:
                                    FreeCAD.Console.PrintMessage('Edge belongs to more than one solid\n')
                                    solid_to_add = None
                                found_edge = True
                elif elt.ShapeType == 'Face':
                    found_face = False
                    for i, s in enumerate(selection[0].Shape.Solids):
                        for e in s.Faces:
                            if elt.isSame(e):
                                if not found_face:
                                    solid_to_add = str(i + 1)
                                else:
                                    FreeCAD.Console.PrintMessage('Face belongs to more than one solid\n')
                                    solid_to_add = None
                                found_edge = True
                if solid_to_add:
                    selection = (selection[0], 'Solid' + solid_to_add)
                    print('selection element changed to Solid: ', selection[0].Shape.ShapeType, '  ', selection[0].Name, '  ', selection[1])
                else:
                    return
            if selection not in self.references:
                self.references.append(selection)
                self.rebuild_list_References()
            else:
                FreeCAD.Console.PrintMessage(selection[0].Name + ' --> ' + selection[1] + ' is in reference list already!\n')

    def rebuild_list_References(self):
        self.form.list_References.clear()
        items = []
        for ref in self.references:
            item_name = ref[0].Name + ':' + ref[1]
            items.append(item_name)
        for listItemName in sorted(items):
            self.form.list_References.addItem(listItemName)
