# ##### BEGIN GPL LICENSE BLOCK #####
#
#  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.
#
# ##### END GPL LICENSE BLOCK #####

# <pep8 compliant>
import bpy
from bpy.types import Panel


class CollectionButtonsPanel:
    bl_space_type = 'PROPERTIES'
    bl_region_type = 'WINDOW'
    bl_context = "collection"


def get_collection_from_context(context):
    active_object = context.active_object

    if active_object and active_object.dupli_group and context.space_data.collection_context == 'GROUP':
        group = active_object.dupli_group
        return group.view_layer.collections.active
    else:
        return context.layer_collection


class COLLECTION_PT_context_collection(CollectionButtonsPanel, Panel):
    bl_label = ""
    bl_options = {'HIDE_HEADER'}

    def draw(self, context):
        layout = self.layout
        space = context.space_data
        active_object = context.active_object

        if active_object and active_object.dupli_group:
            split = layout.split(percentage=0.2)
            split.row().prop(space, "collection_context", expand=True)
            layout = split

        collection = get_collection_from_context(context)
        name = collection.name
        if name == 'Master Collection':
            layout.label(text=name, icon='COLLAPSEMENU')
        else:
            layout.prop(collection, "name", text="", icon='COLLAPSEMENU')


classes = (
    COLLECTION_PT_context_collection,
)

if __name__ == "__main__":  # only for live edit.
    from bpy.utils import register_class
    for cls in classes:
        register_class(cls)