r"""
Version for trame 1.x - https://github.com/Kitware/trame/blob/release-v1/examples/VTK/ContourGeometry/ClientView.py
Delta v1..v2          - https://github.com/Kitware/trame/commit/3852cba56cd63f6efa684d5e5fb00881a6111e81

Installation requirements:
    pip install trame trame-vuetify trame-vtk vtk
"""

from pathlib import Path

from vtkmodules.vtkFiltersCore import vtkContourFilter
from vtkmodules.vtkIOXML import vtkXMLImageDataReader

from trame.app import get_server
from trame.ui.vuetify import SinglePageLayout
from trame.widgets import vtk as vtk_widgets
from trame.widgets import vuetify

# -----------------------------------------------------------------------------
# Trame initialization
# -----------------------------------------------------------------------------

server = get_server(client_type="vue2")
state, ctrl = server.state, server.controller

state.trame__title = "VTK contour - Remote/Local rendering"

# -----------------------------------------------------------------------------
# VTK pipeline
# -----------------------------------------------------------------------------

data_directory = Path(__file__).parent.parent.with_name("data")
head_vti = data_directory / "head.vti"

reader = vtkXMLImageDataReader()
reader.SetFileName(head_vti)
reader.Update()

contour = vtkContourFilter()
contour.SetInputConnection(reader.GetOutputPort())
contour.SetComputeNormals(1)
contour.SetComputeScalars(0)

# Extract data range => Update store/state
data_range = reader.GetOutput().GetPointData().GetScalars().GetRange()
contour_value = 0.5 * (data_range[0] + data_range[1])

# Configure contour with valid values
contour.SetNumberOfContours(1)
contour.SetValue(0, contour_value)

# Share with client
state.data_range = data_range

# -----------------------------------------------------------------------------
# Callbacks
# -----------------------------------------------------------------------------


@state.change("contour_value")
def update_contour(contour_value, **kwargs):
    contour.SetValue(0, contour_value)
    ctrl.ds_update()


# -----------------------------------------------------------------------------
# GUI
# -----------------------------------------------------------------------------

with SinglePageLayout(server) as layout:
    layout.title.set_text("Contour Application - Local rendering")

    with layout.toolbar:
        vuetify.VSpacer()
        vuetify.VSlider(
            value=("contour_value", contour_value),
            min=("data_range[0]",),
            max=("data_range[1]",),
            hide_details=True,
            dense=True,
            style="max-width: 300px",
            change="contour_value = Number($event)",
        )
        vuetify.VSwitch(
            v_model="$vuetify.theme.dark",
            hide_details=True,
        )

        with vuetify.VBtn(icon=True, click="$refs.view.resetCamera()"):
            vuetify.VIcon("mdi-crop-free")

        vuetify.VProgressLinear(
            indeterminate=True,
            absolute=True,
            bottom=True,
            active=("trame__busy",),
        )

    with layout.content:
        with vuetify.VContainer(fluid=True, classes="pa-0 fill-height"):
            with vtk_widgets.VtkView() as view:
                layout.icon.click = view.reset_camera
                with vtk_widgets.VtkGeometryRepresentation():
                    polydata = vtk_widgets.VtkPolyData("contour", dataset=contour)
                    ctrl.ds_update = polydata.update

# -----------------------------------------------------------------------------
# Main
# -----------------------------------------------------------------------------

if __name__ == "__main__":
    server.start()