# ***************************************************************************
# *   Copyright (c) 2021 Bernd Hahnebach <bernd@bimstatik.org>              *
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# *   This file is part of the FreeCAD CAx development system.              *
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import FreeCAD

from . import manager
from .ccx_cantilever_base_edge import setup_cantilever_base_edge
from .manager import init_doc


def get_information():
    return {
        "name": "CCX cantilever beam rectangle",
        "meshtype": "edge",
        "meshelement": "Seg3",
        "constraints": ["fixed", "force"],
        "solvers": ["calculix", "ccxtools"],
        "material": "solid",
        "equations": ["mechanical"]
    }


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

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


See forum topic post:
https://forum.freecad.org/viewtopic.php?f=18&t=16044

CalculiX cantilever:
- modeled with seg3 beam elements

CrossSection:
- rectangle
- width = 400 mm
- height = 1250 mm

max deflection:
doc = App.ActiveDocument
len = doc.CantileverLine.Shape.Length
iyy = doc.CrossSectionFace.Shape.MatrixOfInertia.A22  # Iyy
force = doc.ConstraintForce.Force
from FreeCAD import Units
ym = Units.Quantity(doc.MechanicalMaterial.Material["YoungsModulus"]).getValueAs("MPa")
w = force * len**3 / (3 * ym * iyy)
w  # should print 112.3 mm

CalculiX FEM max deflection:
- 112.2 mm
- but the rotation seams 90 degree rotated (FIXME)

"""


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())))

    width = 400
    height = 1250
    cs_face = doc.addObject("Part::Plane", "CrossSectionFace")
    cs_face.Width = width
    cs_face.Length = height
    cs_face.Placement = FreeCAD.Placement(
        FreeCAD.Vector(0, 500 - 0.5 * width, 500 + 0.5 * height),
        FreeCAD.Rotation(0, 90, 0),
        FreeCAD.Vector(0, 0, 0),
    )
    doc.recompute()

    # setup CalculiX cantilever
    doc = setup_cantilever_base_edge(doc, solvertype)
    beamsection_obj = doc.getObject("BeamCrossSection")

    # change cross section to a circular section
    beamsection_obj.SectionType = "Rectangular"
    beamsection_obj.RectWidth = width
    beamsection_obj.RectHeight = height

    doc.recompute()
    return doc