#!/usr/bin/env python3
# GIMP plugin to add a new desaturated layer

import sys

import gi
gi.require_version('Gimp', '3.0')
from gi.repository import Gimp
gi.require_version('GimpUi', '3.0')
from gi.repository import GimpUi
from gi.repository import GLib


class AddDesaturateLayerPlugin(Gimp.PlugIn):
    def add_desaturate_layer(image, drawable):
        # Duplicate the current layer
        new_layer = drawable.copy()
        new_layer.set_name("Desaturate")
        image.insert_layer(new_layer, None, -1)

        # Apply the desaturation
        Gimp.edit_desaturate_full(
            new_layer, Gimp.DesaturateMode.LIGHTNESS  # You can use LIGHTNESS, LUMINOSITY, or AVERAGE
        )

    def do_query_procedures(self):
        return ['python-fu-add-desaturate-layer']

    def do_activate(self):
        pass

    def do_create_procedure(self, name):
        if name == 'python-fu-add-desaturate-layer':
            procedure = Gimp.Procedure.new(
                self, name, Gimp.PDBProcType.PLUGIN, add_desaturate_layer
            )
            procedure.set_menu_label("Add Desaturate Layer")
            procedure.add_menu_path('<Image>/Filters/')
            procedure.set_attribution(
                "YourName", "YourContact", "Adds a desaturated layer"
            )
            procedure.set_documentation(
                "Adds a new desaturated layer to the active image.",
                "Adds a new desaturated layer to the active image.",
                name,
            )
            return procedure

Gimp.main(AddDesaturateLayerPlugin.__gtype__, None)