import bpy
from bpy.types import Panel
# from .preferences import get_addon_prefs


# Node view panel
class GPEXP_PT_gp_node_ui(Panel):
    bl_space_type = "NODE_EDITOR" # "VIEW_3D"
    bl_region_type = "UI"
    bl_category = "View"
    bl_label = "Gpencil Render Manager"

    def draw(self, context):
        layout = self.layout
        
        row = layout.row()
        ct = len([n for n in context.scene.node_tree.nodes if n.type == 'R_LAYERS' and n.select])
        txt = f'Merge {ct} Layer Nodes'
        row.operator('gp.merge_selected_viewlayer_nodes', icon='NODETREE', text=txt)
        row.enabled = ct > 1
        
        layout.separator()
        
        row=layout.row()
        row.operator('gp.mute_toggle_output_nodes', icon='NODE_INSERT_ON', text='Mute').mute = True
        row.operator('gp.mute_toggle_output_nodes', icon='NODE_INSERT_OFF', text='Unmute').mute = False
        
        layout.separator()

        col=layout.column()
        col.operator('gp.clear_render_tree', icon='X', text='Clear Render Tree')
        col.operator('gp.clear_render_tree', icon='X', text='Clear Delete Render Scene').mode = "COMPLETE"
        

        # layout.operator('gp.add_object_to_render', icon='RENDERLAYERS', text='Layer To Render').mode = 'ALL'
        # layout.operator('gp.add_object_to_render', icon='RENDERLAYERS', text='Layer To Render').mode = 'SELECTED'

        # layout.operator('gp.merge_layers', icon='X', text='Merge selected nodes')

class GPEXP_PT_gp_dopesheet_ui(Panel):
    bl_space_type = 'DOPESHEET_EDITOR'
    bl_region_type = 'UI'
    # bl_category = "Item"
    bl_parent_id='DOPESHEET_PT_gpencil_mode'
    bl_label = "Gpencil Render Manager"

    @classmethod
    def poll(cls, context):
        return context.object and context.object.type == 'GPENCIL'

    def draw(self, context):
        layout = self.layout
        layout.label(text=context.object.name)
        
        ct = len([l for l in context.object.data.layers if l.select])
        txt = f'Merge {ct} layers'

        # merge layers from dopesheet
        layout.operator('gp.merge_selected_dopesheet_layers', text=txt, )
        layout.enabled= ct > 1

def manager_ui(self, context):
    '''appended to DATA_PT_gpencil_layers'''

    layout = self.layout

    ## On layers
    if context.object and context.object.type == 'GPENCIL':
        txt = f'{len([l for l in context.object.data.layers if l.select])} Layer(s) To Render'
    else:
        txt = 'Layer To Render'
    layout.operator('gp.add_layer_to_render', icon='RENDERLAYERS', text=txt)

    ## On objects
    # txt = 'Selected Object To Render'
    if context.scene.name != 'Render':
        txt = f'{len([o for o in context.selected_objects if o.type == "GPENCIL" and o.select_get()])} Selected Object(s) To Render'
        layout.operator('gp.add_object_to_render', icon='RENDERLAYERS', text=txt).mode='SELECTED'
    layout.operator('gp.add_object_to_render', icon='RENDERLAYERS', text='All GP at once').mode='ALL'


# ## function to append in a menu
# def palette_manager_menu(self, context):
#     """Palette menu to append in existing menu"""
#     # GPENCIL_MT_material_context_menu
#     layout = self.layout
#     # {'EDIT_GPENCIL', 'PAINT_GPENCIL','SCULPT_GPENCIL','WEIGHT_GPENCIL', 'VERTEX_GPENCIL'}
#     layout.separator()
#     prefs = get_addon_prefs()

#     layout.operator("", text='do stuff from material submenu', icon='MATERIAL')

#-# REGISTER

classes=(
GPEXP_PT_gp_node_ui,
GPEXP_PT_gp_dopesheet_ui,
)

def register(): 
    for cls in classes:
        bpy.utils.register_class(cls)
    bpy.types.DATA_PT_gpencil_layers.prepend(manager_ui)

def unregister():
    bpy.types.DATA_PT_gpencil_layers.remove(manager_ui)
    for cls in reversed(classes):
        bpy.utils.unregister_class(cls)