# ***************************************************************************
# *                                                                         *
# *   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__ = "_ViewProviderFemMeshGmsh"
__author__ = "Bernd Hahnebach"
__url__ = "http://www.freecadweb.org"

## @package ViewProviderFemMeshGmsh
#  \ingroup FEM

import FreeCAD
import FreeCADGui
import FemGui

# for the panel
from femobjects import _FemMeshGmsh
from PySide import QtCore
from PySide import QtGui
from PySide.QtCore import Qt
from PySide.QtGui import QApplication
import time


class _ViewProviderFemMeshGmsh:
    "A View Provider for the FemMeshGmsh object"

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

    def getIcon(self):
        return ":/icons/fem-femmesh-from-shape.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 setEdit(self, vobj, mode):
        # hide all meshes
        for o in FreeCAD.ActiveDocument.Objects:
            if o.isDerivedFrom("Fem::FemMeshObject"):
                o.ViewObject.hide()
        # show the mesh we like to edit
        self.ViewObject.show()
        # show task panel
        taskd = _TaskPanelFemMeshGmsh(self.Object)
        taskd.obj = vobj.Object
        FreeCADGui.Control.showDialog(taskd)
        return True

    def unsetEdit(self, vobj, mode):
        FreeCADGui.Control.closeDialog()
        self.ViewObject.hide()  # hide the mesh after edit is finished
        return True

    def doubleClicked(self, vobj):
        # Group meshing is only active on active analysis, we should make sure the analysis the mesh belongs too is active
        gui_doc = FreeCADGui.getDocument(vobj.Object.Document)
        if not gui_doc.getInEdit():
            # may be go the other way around and just activate the analysis the user has doubleClicked on ?!
            # not a fast one, we need to iterate over all member of all analysis to know to which analysis the object belongs too!!!
            # first check if there is an analysis in the active document
            found_an_analysis = False
            for o in gui_doc.Document.Objects:
                if o.isDerivedFrom('Fem::FemAnalysisPython'):
                        found_an_analysis = True
                        break
            if found_an_analysis:
                if FemGui.getActiveAnalysis() is not None:
                    if FemGui.getActiveAnalysis().Document is FreeCAD.ActiveDocument:
                        if self.Object in FemGui.getActiveAnalysis().Group:
                            if not gui_doc.getInEdit():
                                gui_doc.setEdit(vobj.Object.Name)
                            else:
                                FreeCAD.Console.PrintError('Activate the analysis this Gmsh FEM mesh object belongs too!\n')
                        else:
                            print('Gmsh FEM mesh object does not belong to the active analysis.')
                            found_mesh_analysis = False
                            for o in gui_doc.Document.Objects:
                                if o.isDerivedFrom('Fem::FemAnalysisPython'):
                                    for m in o.Group:
                                        if m == self.Object:
                                            found_mesh_analysis = True
                                            FemGui.setActiveAnalysis(o)
                                            print('The analysis the Gmsh FEM mesh object belongs too was found and activated: ' + o.Name)
                                            gui_doc.setEdit(vobj.Object.Name)
                                            break
                            if not found_mesh_analysis:
                                print('Gmsh FEM mesh object does not belong to an analysis. Analysis group meshing will be deactivated.')
                                gui_doc.setEdit(vobj.Object.Name)
                    else:
                        FreeCAD.Console.PrintError('Active analysis is not in active document.')
                else:
                    print('No active analysis in active document, we are going to have a look if the Gmsh FEM mesh object belongs to a non active analysis.')
                    found_mesh_analysis = False
                    for o in gui_doc.Document.Objects:
                        if o.isDerivedFrom('Fem::FemAnalysisPython'):
                            for m in o.Group:
                                if m == self.Object:
                                    found_mesh_analysis = True
                                    FemGui.setActiveAnalysis(o)
                                    print('The analysis the Gmsh FEM mesh object belongs to was found and activated: ' + o.Name)
                                    gui_doc.setEdit(vobj.Object.Name)
                                    break
                    if not found_mesh_analysis:
                        print('Gmsh FEM mesh object does not belong to an analysis. Analysis group meshing will be deactivated.')
                        gui_doc.setEdit(vobj.Object.Name)
            else:
                print('No analysis in the active document.')
                gui_doc.setEdit(vobj.Object.Name)
        else:
            from PySide.QtGui import QMessageBox
            message = 'Active Task Dialog found! Please close this one before open a new one!'
            QMessageBox.critical(None, "Error in tree view", message)
            FreeCAD.Console.PrintError(message + '\n')
        return True

    def __getstate__(self):
        return None

    def __setstate__(self, state):
        return None

    def claimChildren(self):
        return (self.Object.MeshRegionList + self.Object.MeshGroupList + self.Object.MeshBoundaryLayerList)

    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

    def canDragObjects(self):
        return True

    def canDropObjects(self):
        return True

    def canDragObject(self, dragged_object):
        if hasattr(dragged_object, "Proxy") and dragged_object.Proxy.Type == "Fem::FemMeshBoundaryLayer":
            return True
        elif hasattr(dragged_object, "Proxy") and dragged_object.Proxy.Type == "Fem::FemMeshGroup":
            return True
        elif hasattr(dragged_object, "Proxy") and dragged_object.Proxy.Type == "Fem::FemMeshRegion":
            return True
        else:
            return False

    def canDropObject(self, incoming_object):
        return True

    def dragObject(self, selfvp, dragged_object):
        if hasattr(dragged_object, "Proxy") and dragged_object.Proxy.Type == "Fem::FemMeshBoundaryLayer":
            objs = self.Object.MeshBoundaryLayerList
            objs.remove(dragged_object)
            self.Object.MeshBoundaryLayerList = objs
        elif hasattr(dragged_object, "Proxy") and dragged_object.Proxy.Type == "Fem::FemMeshGroup":
            objs = self.Object.MeshGroupList
            objs.remove(dragged_object)
            self.Object.MeshGroupList = objs
        elif hasattr(dragged_object, "Proxy") and dragged_object.Proxy.Type == "Fem::FemMeshRegion":
            objs = self.Object.MeshRegionList
            objs.remove(dragged_object)
            self.Object.MeshRegionList = objs

    def dropObject(self, selfvp, incoming_object):
        if hasattr(incoming_object, "Proxy") and incoming_object.Proxy.Type == "Fem::FemMeshBoundaryLayer":
            objs = self.Object.MeshBoundaryLayerList
            objs.append(incoming_object)
            self.Object.MeshBoundaryLayerList = objs
        elif hasattr(incoming_object, "Proxy") and incoming_object.Proxy.Type == "Fem::FemMeshGroup":
            objs = self.Object.MeshGroupList
            objs.append(incoming_object)
            self.Object.MeshGroupList = objs
        elif hasattr(incoming_object, "Proxy") and incoming_object.Proxy.Type == "Fem::FemMeshRegion":
            objs = self.Object.MeshRegionList
            objs.append(incoming_object)
            self.Object.MeshRegionList = objs
        FreeCAD.ActiveDocument.recompute()


class _TaskPanelFemMeshGmsh:
    '''The TaskPanel for editing References property of FemMeshGmsh objects and creation of new FEM mesh'''

    def __init__(self, obj):
        self.mesh_obj = obj
        self.form = FreeCADGui.PySideUic.loadUi(FreeCAD.getHomePath() + "Mod/Fem/Resources/ui/MeshGmsh.ui")

        self.Timer = QtCore.QTimer()
        self.Timer.start(100)  # 100 milli seconds
        self.gmsh_runs = False
        self.console_message_gmsh = ''

        QtCore.QObject.connect(self.form.if_max, QtCore.SIGNAL("valueChanged(Base::Quantity)"), self.max_changed)
        QtCore.QObject.connect(self.form.if_min, QtCore.SIGNAL("valueChanged(Base::Quantity)"), self.min_changed)
        QtCore.QObject.connect(self.form.cb_dimension, QtCore.SIGNAL("activated(int)"), self.choose_dimension)
        QtCore.QObject.connect(self.Timer, QtCore.SIGNAL("timeout()"), self.update_timer_text)

        self.form.cb_dimension.addItems(_FemMeshGmsh._FemMeshGmsh.known_element_dimensions)

        self.get_mesh_params()
        self.get_active_analysis()
        self.update()

    def getStandardButtons(self):
        return int(QtGui.QDialogButtonBox.Ok | QtGui.QDialogButtonBox.Apply | QtGui.QDialogButtonBox.Cancel)
        # show a OK, a apply and a Cancel button
        # def reject() is called on Cancel button
        # def clicked(self, button) is needed, to access the apply button

    def accept(self):
        self.set_mesh_params()
        FreeCADGui.ActiveDocument.resetEdit()
        FreeCAD.ActiveDocument.recompute()
        return True

    def reject(self):
        FreeCADGui.ActiveDocument.resetEdit()
        FreeCAD.ActiveDocument.recompute()
        return True

    def clicked(self, button):
        if button == QtGui.QDialogButtonBox.Apply:
            self.set_mesh_params()
            self.run_gmsh()

    def get_mesh_params(self):
        self.clmax = self.mesh_obj.CharacteristicLengthMax
        self.clmin = self.mesh_obj.CharacteristicLengthMin
        self.dimension = self.mesh_obj.ElementDimension

    def set_mesh_params(self):
        self.mesh_obj.CharacteristicLengthMax = self.clmax
        self.mesh_obj.CharacteristicLengthMin = self.clmin
        self.mesh_obj.ElementDimension = self.dimension

    def update(self):
        'fills the widgets'
        self.form.if_max.setText(self.clmax.UserString)
        self.form.if_min.setText(self.clmin.UserString)
        index_dimension = self.form.cb_dimension.findText(self.dimension)
        self.form.cb_dimension.setCurrentIndex(index_dimension)

    def console_log(self, message="", color="#000000"):
        if not isinstance(message, bytes):
            message = message.encode('utf-8', 'replace')
        self.console_message_gmsh = self.console_message_gmsh + '<font color="#0000FF">{0:4.1f}:</font> <font color="{1}">{2}</font><br>'.\
            format(time.time() - self.Start, color, message)
        self.form.te_output.setText(self.console_message_gmsh)
        self.form.te_output.moveCursor(QtGui.QTextCursor.End)

    def update_timer_text(self):
        # print('timer1')
        if self.gmsh_runs:
            print('timer2')
            # print('Time: {0:4.1f}: '.format(time.time() - self.Start))
            self.form.l_time.setText('Time: {0:4.1f}: '.format(time.time() - self.Start))

    def max_changed(self, base_quantity_value):
        self.clmax = base_quantity_value

    def min_changed(self, base_quantity_value):
        self.clmin = base_quantity_value

    def choose_dimension(self, index):
        if index < 0:
            return
        self.form.cb_dimension.setCurrentIndex(index)
        self.dimension = str(self.form.cb_dimension.itemText(index))  # form returns unicode

    def run_gmsh(self):
        QApplication.setOverrideCursor(Qt.WaitCursor)
        part = self.obj.Part
        if self.mesh_obj.MeshRegionList:
            if part.Shape.ShapeType == "Compound" and hasattr(part, "Proxy"):  # other part obj might not have a Proxy, thus an exception would be raised
                if (part.Proxy.Type == "FeatureBooleanFragments" or part.Proxy.Type == "FeatureSlice" or part.Proxy.Type == "FeatureXOR"):
                    error_message = "The mesh to shape is a boolean split tools Compound and the mesh has mesh region list. Gmsh could return unexpected meshes in such circumstances. It is strongly recommended to extract the shape to mesh from the Compound and use this one."
                    QtGui.QMessageBox.critical(None, "Shape to mesh is a BooleanFragmentsCompound and mesh regions are defined", error_message)
        self.Start = time.time()
        self.form.l_time.setText('Time: {0:4.1f}: '.format(time.time() - self.Start))
        self.console_message_gmsh = ''
        self.gmsh_runs = True
        self.console_log("We are going to start ...")
        self.get_active_analysis()
        import femmesh.gmshtools as gmshtools
        gmsh_mesh = gmshtools.GmshTools(self.obj, self.analysis)
        self.console_log("Start Gmsh ...")
        error = ''
        try:
            error = gmsh_mesh.create_mesh()
        except:
            import sys
            print("Unexpected error when creating mesh: ", sys.exc_info()[0])
        if error:
            print(error)
            self.console_log('Gmsh had warnings ...')
            self.console_log(error, '#FF0000')
        else:
            self.console_log('Clean run of Gmsh')
        self.console_log("Gmsh done!")
        self.form.l_time.setText('Time: {0:4.1f}: '.format(time.time() - self.Start))
        self.Timer.stop()
        self.update()
        QApplication.restoreOverrideCursor()

    def get_active_analysis(self):
        import FemGui
        self.analysis = FemGui.getActiveAnalysis()
        if self.analysis:
            for m in FemGui.getActiveAnalysis().Group:
                if m.Name == self.mesh_obj.Name:
                    print('Active analysis found: ' + self.analysis.Name)
                    return
            else:
                # print('Mesh is not member of active analysis, means no group meshing')
                self.analysis = None  # no group meshing
        else:
            # print('No active analysis, means no group meshing')
            self.analysis = None  # no group meshing
