# ***************************************************************************
# *   Copyright (c) 2020 Bernd Hahnebach <bernd@bimstatik.org>              *
# *                                                                         *
# *   This file is part of the FreeCAD CAx development system.              *
# *                                                                         *
# *   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.                                 *
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# *   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.                  *
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# *   You should have received a copy of the GNU Library General Public     *
# *   License along with this program; if not, write to the Free Software   *
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# ***************************************************************************
"""Class and methods to migrate old FEM App objects

see module end as well as forum topic
https://forum.freecad.org/viewtopic.php?&t=46218
"""

__title__ = "FEM class and methods that migrates old App objects"
__author__ = "Bernd Hahnebach"
__url__ = "https://www.freecad.org"

from importlib.util import spec_from_loader

import FreeCAD


class FemMigrateApp:

    def find_spec(self, fullname, path, target=None):
        if fullname in {
            "femsolver.elmer.equations",
            "femsolver.elmer.equations.fluxsolver",
            "femsolver.elmer.solver",
            "femobjects",
            "femobjects._FemConstraintBodyHeatSource",
            "femobjects._FemConstraintElectrostaticPotential",
            "femobjects._FemConstraintFlowVelocity",
            "femobjects._FemConstraintInitialFlowVelocity",
            "femobjects._FemConstraintSelfWeight",
            "femobjects._FemConstraintTie",
            "femobjects._FemElementFluid1D",
            "femobjects._FemElementGeometry1D",
            "femobjects._FemElementGeometry2D",
            "femobjects._FemElementRotation1D",
            "femobjects._FemMaterial",
            "femobjects._FemMaterialMechanicalNonlinear",
            "femobjects._FemMaterialReinforced",
            "femobjects._FemMeshBoundaryLayer",
            "femobjects._FemMeshGmsh",
            "femobjects._FemMeshGroup",
            "femobjects._FemMeshRegion",
            "femobjects._FemMeshResult",
            "femobjects._FemResultMechanical",
            "femobjects._FemSolverCalculix",
            "PyObjects",
            "PyObjects._FemConstraintBodyHeatSource",
            "PyObjects._FemConstraintElectrostaticPotential",
            "PyObjects._FemConstraintFlowVelocity",
            "PyObjects._FemConstraintInitialFlowVelocity",
            "PyObjects._FemConstraintSelfWeight",
            "PyObjects._FemElementFluid1D",
            "PyObjects._FemElementGeometry1D",
            "PyObjects._FemElementGeometry2D",
            "PyObjects._FemElementRotation1D",
            "PyObjects._FemMaterial",
            "PyObjects._FemMaterialMechanicalNonlinear",
            "PyObjects._FemMeshBoundaryLayer",
            "PyObjects._FemMeshGmsh",
            "PyObjects._FemMeshGroup",
            "PyObjects._FemMeshRegion",
            "PyObjects._FemMeshResult",
            "PyObjects._FemResultMechanical",
            "PyObjects._FemSolverCalculix",
            "PyObjects._FemSolverZ88",
            "PyObjects._FemBeamSection",
            "PyObjects._FemFluidSection",
            "PyObjects._FemShellThickness",
            "_FemBeamSection",
            "_FemConstraintSelfWeight",
            "_FemMaterial",
            "_FemMaterialMechanicalNonlinear",
            "_FemMeshGmsh",
            "_FemMeshGroup",
            "_FemMeshRegion",
            "_FemResultMechanical",
            "_FemShellThickness",
            "_FemSolverCalculix",
            "_FemSolverZ88",
            "_FemMechanicalResult",
            "FemResult",
            "_MechanicalMaterial",
            "FemBeamSection",
            "FemShellThickness",
            "MechanicalAnalysis",
            "MechanicalMaterial",
        }:
            return spec_from_loader(fullname, self)
        return None

    def create_module(self, spec):
        return None

    def exec_module(self, module):
        return self.load_module(module)

    def load_module(self, module):
        if module.__name__ == "femsolver.elmer.equations":
            return self
        if module.__name__ == "femsolver.elmer.equations.fluxsolver":
            import femsolver.elmer.equations.flux

            module.Proxy = femsolver.elmer.equations.flux.Proxy
            if FreeCAD.GuiUp:
                module.ViewProxy = femsolver.elmer.equations.flux.ViewProxy

        if module.__name__ == "femsolver.elmer.solver":
            from femobjects.solver_elmer import SolverElmer

            module.Proxy = SolverElmer
            if FreeCAD.GuiUp:
                from femviewprovider.view_solver_elmer import VPSolverElmer

                module.ViewProxy = VPSolverElmer

        if module.__name__ == "femobjects":
            module.__path__ = "femobjects"
        if module.__name__ == "femobjects._FemConstraintBodyHeatSource":
            import femobjects.constraint_bodyheatsource

            module.Proxy = femobjects.constraint_bodyheatsource.ConstraintBodyHeatSource
        if module.__name__ == "femobjects._FemConstraintElectrostaticPotential":
            import femobjects.constraint_electrostaticpotential

            module.Proxy = (
                femobjects.constraint_electrostaticpotential.ConstraintElectrostaticPotential
            )
        if module.__name__ == "femobjects._FemConstraintFlowVelocity":
            import femobjects.constraint_flowvelocity

            module.Proxy = femobjects.constraint_flowvelocity.ConstraintFlowVelocity
        if module.__name__ == "femobjects._FemConstraintInitialFlowVelocity":
            import femobjects.constraint_initialflowvelocity

            module.Proxy = femobjects.constraint_initialflowvelocity.ConstraintInitialFlowVelocity
        if module.__name__ == "femobjects._FemConstraintSelfWeight":
            import femobjects.constraint_selfweight

            module._FemConstraintSelfWeight = femobjects.constraint_selfweight.ConstraintSelfWeight
        if module.__name__ == "femobjects._FemConstraintTie":
            import femobjects.constraint_tie

            module._FemConstraintTie = femobjects.constraint_tie.ConstraintTie
        if module.__name__ == "femobjects._FemElementFluid1D":
            import femobjects.element_fluid1D

            module._FemElementFluid1D = femobjects.element_fluid1D.ElementFluid1D
        if module.__name__ == "femobjects._FemElementGeometry1D":
            import femobjects.element_geometry1D

            module._FemElementGeometry1D = femobjects.element_geometry1D.ElementGeometry1D
        if module.__name__ == "femobjects._FemElementGeometry2D":
            import femobjects.element_geometry2D

            module._FemElementGeometry2D = femobjects.element_geometry2D.ElementGeometry2D
        if module.__name__ == "femobjects._FemElementRotation1D":
            import femobjects.element_rotation1D

            module._FemElementRotation1D = femobjects.element_rotation1D.ElementRotation1D
        if module.__name__ == "femobjects._FemMaterial":
            import femobjects.material_common

            module._FemMaterial = femobjects.material_common.MaterialCommon
        if module.__name__ == "femobjects._FemMaterialMechanicalNonlinear":
            import femobjects.material_mechanicalnonlinear

            module._FemMaterialMechanicalNonlinear = (
                femobjects.material_mechanicalnonlinear.MaterialMechanicalNonlinear
            )
        if module.__name__ == "femobjects._FemMaterialReinforced":
            import femobjects.material_reinforced

            module._FemMaterialReinforced = femobjects.material_reinforced.MaterialReinforced
        if module.__name__ == "femobjects._FemMeshBoundaryLayer":
            import femobjects.mesh_boundarylayer

            module._FemMeshBoundaryLayer = femobjects.mesh_boundarylayer.MeshBoundaryLayer
        if module.__name__ == "femobjects._FemMeshGmsh":
            import femobjects.mesh_gmsh

            module._FemMeshGmsh = femobjects.mesh_gmsh.MeshGmsh
        if module.__name__ == "femobjects._FemMeshGroup":
            import femobjects.mesh_group

            module._FemMeshGroup = femobjects.mesh_group.MeshGroup
        if module.__name__ == "femobjects._FemMeshRegion":
            import femobjects.mesh_region

            module._FemMeshRegion = femobjects.mesh_region.MeshRegion
        if module.__name__ == "femobjects._FemMeshResult":
            import femobjects.mesh_result

            module._FemMeshResult = femobjects.mesh_result.MeshResult
        if module.__name__ == "femobjects._FemResultMechanical":
            import femobjects.result_mechanical

            module._FemResultMechanical = femobjects.result_mechanical.ResultMechanical
        if module.__name__ == "femobjects._FemSolverCalculix":
            import femobjects.solver_ccxtools

            module._FemSolverCalculix = femobjects.solver_ccxtools.SolverCcxTools

        if module.__name__ == "PyObjects":
            module.__path__ = "PyObjects"
        if module.__name__ == "PyObjects._FemConstraintBodyHeatSource":
            import femobjects.constraint_bodyheatsource

            module.Proxy = femobjects.constraint_bodyheatsource.ConstraintBodyHeatSource
        if module.__name__ == "PyObjects._FemConstraintElectrostaticPotential":
            import femobjects.constraint_electrostaticpotential

            module.Proxy = (
                femobjects.constraint_electrostaticpotential.ConstraintElectrostaticPotential
            )
        if module.__name__ == "PyObjects._FemConstraintFlowVelocity":
            import femobjects.constraint_flowvelocity

            module.Proxy = femobjects.constraint_flowvelocity.ConstraintFlowVelocity
        if module.__name__ == "PyObjects._FemConstraintInitialFlowVelocity":
            import femobjects.constraint_initialflowvelocity

            module.Proxy = femobjects.constraint_initialflowvelocity.ConstraintInitialFlowVelocity
        if module.__name__ == "PyObjects._FemConstraintSelfWeight":
            import femobjects.constraint_selfweight

            module._FemConstraintSelfWeight = femobjects.constraint_selfweight.ConstraintSelfWeight
        if module.__name__ == "PyObjects._FemElementFluid1D":
            import femobjects.element_fluid1D

            module._FemElementFluid1D = femobjects.element_fluid1D.ElementFluid1D
        if module.__name__ == "PyObjects._FemElementGeometry1D":
            import femobjects.element_geometry1D

            module._FemElementGeometry1D = femobjects.element_geometry1D.ElementGeometry1D
        if module.__name__ == "PyObjects._FemElementGeometry2D":
            import femobjects.element_geometry2D

            module._FemElementGeometry2D = femobjects.element_geometry2D.ElementGeometry2D
        if module.__name__ == "PyObjects._FemElementRotation1D":
            import femobjects.element_rotation1D

            module._FemElementRotation1D = femobjects.element_rotation1D.ElementRotation1D
        if module.__name__ == "PyObjects._FemMaterial":
            import femobjects.material_common

            module._FemMaterial = femobjects.material_common.MaterialCommon
        if module.__name__ == "PyObjects._FemMaterialMechanicalNonlinear":
            import femobjects.material_mechanicalnonlinear

            module._FemMaterialMechanicalNonlinear = (
                femobjects.material_mechanicalnonlinear.MaterialMechanicalNonlinear
            )
        if module.__name__ == "PyObjects._FemMeshBoundaryLayer":
            import femobjects.mesh_boundarylayer

            module._FemMeshBoundaryLayer = femobjects.mesh_boundarylayer.MeshBoundaryLayer
        if module.__name__ == "PyObjects._FemMeshGmsh":
            import femobjects.mesh_gmsh

            module._FemMeshGmsh = femobjects.mesh_gmsh.MeshGmsh
        if module.__name__ == "PyObjects._FemMeshGroup":
            import femobjects.mesh_group

            module._FemMeshGroup = femobjects.mesh_group.MeshGroup
        if module.__name__ == "PyObjects._FemMeshRegion":
            import femobjects.mesh_region

            module._FemMeshRegion = femobjects.mesh_region.MeshRegion
        if module.__name__ == "PyObjects._FemMeshResult":
            import femobjects.mesh_result

            module._FemMeshResult = femobjects.mesh_result.MeshResult
        if module.__name__ == "PyObjects._FemResultMechanical":
            import femobjects.result_mechanical

            module._FemResultMechanical = femobjects.result_mechanical.ResultMechanical
        if module.__name__ == "PyObjects._FemSolverCalculix":
            import femobjects.solver_ccxtools

            module._FemSolverCalculix = femobjects.solver_ccxtools.SolverCcxTools
        if module.__name__ == "PyObjects._FemSolverZ88":
            import femsolver.z88.solver

            module._FemSolverZ88 = femsolver.z88.solver.Proxy

        if module.__name__ == "PyObjects._FemBeamSection":
            import femobjects.element_geometry1D

            module._FemBeamSection = femobjects.element_geometry1D.ElementGeometry1D
        if module.__name__ == "PyObjects._FemFluidSection":
            import femobjects.element_fluid1D

            module._FemFluidSection = femobjects.element_fluid1D.ElementFluid1D
        if module.__name__ == "PyObjects._FemShellThickness":
            import femobjects.element_geometry2D

            module._FemShellThickness = femobjects.element_geometry2D.ElementGeometry2D

        if module.__name__ == "_FemBeamSection":
            import femobjects.element_geometry1D

            module._FemBeamSection = femobjects.element_geometry1D.ElementGeometry1D
        if module.__name__ == "_FemConstraintSelfWeight":
            import femobjects.constraint_selfweight

            module._FemConstraintSelfWeight = femobjects.constraint_selfweight.ConstraintSelfWeight
        if module.__name__ == "_FemMaterial":
            import femobjects.material_common

            module._FemMaterial = femobjects.material_common.MaterialCommon
        if module.__name__ == "_FemMaterialMechanicalNonlinear":
            import femobjects.material_mechanicalnonlinear

            module._FemMaterialMechanicalNonlinear = (
                femobjects.material_mechanicalnonlinear.MaterialMechanicalNonlinear
            )
        if module.__name__ == "_FemMeshGmsh":
            import femobjects.mesh_gmsh

            module._FemMeshGmsh = femobjects.mesh_gmsh.MeshGmsh
        if module.__name__ == "_FemMeshGroup":
            import femobjects.mesh_group

            module._FemMeshGroup = femobjects.mesh_group.MeshGroup
        if module.__name__ == "_FemMeshRegion":
            import femobjects.mesh_region

            module._FemMeshRegion = femobjects.mesh_region.MeshRegion
        if module.__name__ == "_FemResultMechanical":
            import femobjects.result_mechanical

            module._FemResultMechanical = femobjects.result_mechanical.ResultMechanical
        if module.__name__ == "_FemShellThickness":
            import femobjects.element_geometry2D

            module._FemShellThickness = femobjects.element_geometry2D.ElementGeometry2D
        if module.__name__ == "_FemSolverCalculix":
            import femobjects.solver_ccxtools

            module._FemSolverCalculix = femobjects.solver_ccxtools.SolverCcxTools
        if module.__name__ == "_FemSolverZ88":
            import femsolver.z88.solver

            module._FemSolverZ88 = femsolver.z88.solver.Proxy

        if module.__name__ == "_FemMechanicalResult":
            import femobjects.result_mechanical

            module._FemMechanicalResult = femobjects.result_mechanical.ResultMechanical
        if module.__name__ == "FemResult":
            import femobjects.result_mechanical

            module.FemResult = femobjects.result_mechanical.ResultMechanical
        if module.__name__ == "_MechanicalMaterial":
            import femobjects.material_common

            module._MechanicalMaterial = femobjects.material_common.MaterialCommon

        if module.__name__ == "FemBeamSection":
            import femobjects.element_geometry1D

            module._FemBeamSection = femobjects.element_geometry1D.ElementGeometry1D
            if FreeCAD.GuiUp:
                import femviewprovider.view_element_geometry1D

                module._ViewProviderFemBeamSection = (
                    femviewprovider.view_element_geometry1D.VPElementGeometry1D
                )
        if module.__name__ == "FemShellThickness":
            import femobjects.element_geometry2D

            module._FemShellThickness = femobjects.element_geometry2D.ElementGeometry2D
            if FreeCAD.GuiUp:
                import femviewprovider.view_element_geometry2D

                module._ViewProviderFemShellThickness = (
                    femviewprovider.view_element_geometry2D.VPElementGeometry2D
                )
        if module.__name__ == "MechanicalAnalysis":
            import femobjects.base_fempythonobject

            module._FemAnalysis = femobjects.base_fempythonobject.BaseFemPythonObject
            if FreeCAD.GuiUp:
                import femviewprovider.view_base_femobject

                module._ViewProviderFemAnalysis = (
                    femviewprovider.view_base_femobject.VPBaseFemObject
                )
        if module.__name__ == "MechanicalMaterial":
            import femobjects.material_common

            module._MechanicalMaterial = femobjects.material_common.MaterialCommon
            if FreeCAD.GuiUp:
                import femviewprovider.view_material_common

                module._ViewProviderMechanicalMaterial = (
                    femviewprovider.view_material_common.VPMaterialCommon
                )
        return None


"""
possible entries in the old files:
(the class name in the old file does not matter, we ever only had one class per module)

further renaming objects
module="femsolver.elmer.equations.fluxsolver"
in this modules object class and viewprovider class are in same module


fourth big moving
renaming class and module names in femobjects
TODO add link to commit before the first commit
module="femobjects._FemConstraintBodyHeatSource"
module="femobjects._FemConstraintElectrostaticPotential"
module="femobjects._FemConstraintFlowVelocity"
module="femobjects._FemConstraintInitialFlowVelocity"
module="femobjects._FemConstraintSelfWeight"
module="femobjects._FemConstraintTie"
module="femobjects._FemElementFluid1D"
module="femobjects._FemElementGeometry1D"
module="femobjects._FemElementGeometry2D"
module="femobjects._FemElementRotation1D"
module="femobjects._FemMaterial"
module="femobjects._FemMaterialMechanicalNonlinear"
module="femobjects._FemMaterialReinforced"
module="femobjects._FemMeshBoundaryLayer"
module="femobjects._FemMeshGmsh"
module="femobjects._FemMeshGroup"
module="femobjects._FemMeshRegion"
module="femobjects._FemMeshResult"
module="femobjects._FemResultMechanical"
module="femobjects._FemSolverCalculix"

third big moving
from PyObjects to femobjects, following the parent commit
https://github.com/FreeCAD/FreeCAD/tree/07ae0e56c4/src/Mod/Fem/PyObjects
module="PyObjects._FemConstraintBodyHeatSource"
module="PyObjects._FemConstraintElectrostaticPotential"
module="PyObjects._FemConstraintFlowVelocity"
module="PyObjects._FemConstraintInitialFlowVelocity"
module="PyObjects._FemConstraintSelfWeight"
module="PyObjects._FemElementFluid1D"
module="PyObjects._FemElementGeometry1D"
module="PyObjects._FemElementGeometry2D"
module="PyObjects._FemElementRotation1D"
module="PyObjects._FemMaterial"
module="PyObjects._FemMaterialMechanicalNonlinear"
module="PyObjects._FemMeshBoundaryLayer"
module="PyObjects._FemMeshGmsh"
module="PyObjects._FemMeshGroup"
module="PyObjects._FemMeshRegion"
module="PyObjects._FemMeshResult"
module="PyObjects._FemResultMechanical"
module="PyObjects._FemSolverCalculix"
module="PyObjects._FemSolverZ88"

renamed between the second and third big moveings
module="PyObjects._FemBeamSection"
module="PyObjects._FemFluidSection"
module="PyObjects._FemShellThickness"

second big moveing
into PyObjects, following the parent commit
https://github.com/FreeCAD/FreeCAD/tree/7f884e8bff/src/Mod/Fem
module="_FemBeamSection"
module="_FemConstraintSelfWeight"
module="_FemMaterial"
module="_FemMaterialMechanicalNonlinear."
module="_FemMeshGmsh"
module="_FemMeshGroup"
module="_FemMeshRegion"
module="_FemResultMechanical"
module="_FemShellThickness"
module="_FemSolverCalculix"
module="_FemSolverZ88"

renamed between the first and second big moveings
module="_FemMechanicalResult"
module="FemResult"
module="_MechanicalMaterial"

first big moving
split modules from one module into make, obj class, vp class, command
new obj class module names had a _
following the parent commit of the first split commit
https://github.com/FreeCAD/FreeCAD/tree/c3328d6b4e/src/Mod/Fem
in this modules there where object class and viewprovider class together
module="FemBeamSection"
module="FemShellThickness"
module="MechanicalAnalysis"
module="MechanicalMaterial"
"""