# ***************************************************************************
# *   Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com>   *
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# *   This file is part of the FreeCAD CAx development system.              *
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import FreeCAD

import Fem
import ObjectsFem

from . import manager
from .manager import get_meshname
from .manager import init_doc


def get_information():
    return {
        "name": "Constraint Self Weight Cantilever",
        "meshtype": "solid",
        "meshelement": "Tet10",
        "constraints": ["fixed", "self weight"],
        "solvers": ["calculix", "ccxtools", "elmer"],
        "material": "solid",
        "equations": ["mechanical"]
    }


def get_explanation(header=""):
    return header + """

To run the example from Python console use:
from femexamples.constraint_selfweight_cantilever import setup
setup()


See forum topic post:
https://forum.freecad.org/viewtopic.php?f=18&t=48513

cantilever under self weight made from steel grad 235
l = 32 m, yields just from self weight, means max sigma around 235 n/mm2
max deformation = 576.8 mm

"""


def setup(doc=None, solvertype="ccxtools"):

    # init FreeCAD document
    if doc is None:
        doc = init_doc()

    # explanation object
    # just keep the following line and change text string in get_explanation method
    manager.add_explanation_obj(doc, get_explanation(manager.get_header(get_information())))

    # geometric object
    geom_obj = doc.addObject("Part::Box", "Box")
    geom_obj.Height = geom_obj.Width = 1000
    geom_obj.Length = 32000
    doc.recompute()
    if FreeCAD.GuiUp:
        geom_obj.ViewObject.Document.activeView().viewAxonometric()
        geom_obj.ViewObject.Document.activeView().fitAll()

    # analysis
    analysis = ObjectsFem.makeAnalysis(doc, "Analysis")

    # solver
    if solvertype == "calculix":
        solver_obj = ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
    elif solvertype == "ccxtools":
        solver_obj = ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
        solver_obj.WorkingDir = u""
    elif solvertype == "elmer":
        solver_obj = ObjectsFem.makeSolverElmer(doc, "SolverElmer")
        eq_obj = ObjectsFem.makeEquationElasticity(doc, solver_obj)
        eq_obj.LinearSolverType = "Direct"
    else:
        FreeCAD.Console.PrintWarning(
            "Unknown or unsupported solver type: {}. "
            "No solver object was created.\n".format(solvertype)
        )
    if solvertype == "calculix" or solvertype == "ccxtools":
        solver_obj.SplitInputWriter = False
        solver_obj.AnalysisType = "static"
        solver_obj.GeometricalNonlinearity = "linear"
        solver_obj.ThermoMechSteadyState = False
        solver_obj.MatrixSolverType = "default"
        solver_obj.IterationsControlParameterTimeUse = False
    analysis.addObject(solver_obj)

    # material
    material_obj = ObjectsFem.makeMaterialSolid(doc, "FemMaterial")
    mat = material_obj.Material
    mat["Name"] = "CalculiX-Steel"
    mat["YoungsModulus"] = "210000 MPa"
    mat["PoissonRatio"] = "0.30"
    mat["Density"] = "7900 kg/m^3"
    material_obj.Material = mat
    analysis.addObject(material_obj)

    # constraint fixed
    con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
    con_fixed.References = [(geom_obj, "Face1")]
    analysis.addObject(con_fixed)

    # constraint selfweight
    con_selfweight = ObjectsFem.makeConstraintSelfWeight(doc, "ConstraintSelfWeight")
    con_selfweight.Gravity_z = -1.00
    analysis.addObject(con_selfweight)

    # mesh
    from .meshes.mesh_selfweight_cantilever_tetra10 import create_nodes, create_elements
    fem_mesh = Fem.FemMesh()
    control = create_nodes(fem_mesh)
    if not control:
        FreeCAD.Console.PrintError("Error on creating nodes.\n")
    control = create_elements(fem_mesh)
    if not control:
        FreeCAD.Console.PrintError("Error on creating elements.\n")
    femmesh_obj = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
    femmesh_obj.FemMesh = fem_mesh
    femmesh_obj.Part = geom_obj
    femmesh_obj.SecondOrderLinear = False

    doc.recompute()
    return doc