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#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# ##### END GPL LICENSE BLOCK #####

import bpy


def geometry_modifier_poll(context) -> bool:
    ob = context.object

    # Test object support for geometry node modifier (No volume or hair object support yet)
    if not ob or ob.type not in {'MESH', 'CURVE', 'SURFACE', 'META', 'FONT', 'POINTCLOUD'}:
        return False

    return True


class NewGeometryNodeTree(bpy.types.Operator):
    """Create a new geometry node tree"""
    bl_idname = "node.new_geometry_node_tree"
    bl_label = "New Geometry Node Tree"
    bl_options = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        return geometry_modifier_poll(context)

    def execute(self, context):
        group = bpy.data.node_groups.new("Geometry Nodes", 'GeometryNodeTree')
        group.inputs.new('NodeSocketGeometry', "Geometry")
        group.outputs.new('NodeSocketGeometry', "Geometry")
        input_node = group.nodes.new('NodeGroupInput')
        output_node = group.nodes.new('NodeGroupOutput')
        output_node.is_active_output = True

        input_node.location.x = -200 - input_node.width
        output_node.location.x = 200

        group.links.new(output_node.inputs[0], input_node.outputs[0])

        return {'FINISHED'}


classes = (
    NewGeometryNodeTree,
)