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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
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#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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import bpy
from bpy.props import BoolProperty, IntProperty, StringProperty
from numpy import ndarray

from sverchok.node_tree import SverchCustomTreeNode
from sverchok.data_structure import updateNode, changable_sockets, levels_of_list_or_np


class ListFLNode(bpy.types.Node, SverchCustomTreeNode):
    '''
    Triggers: Split First and Last items
    Tooltip: Get first and last elements of a list, also available the middle.
    '''
    bl_idname = 'ListFLNode'
    bl_label = 'List First & Last'
    bl_icon = 'OUTLINER_OB_EMPTY'
    sv_icon = 'SV_LIST_FIRST_LAST'

    level: IntProperty(name='level_to_count', default=2, min=1, update=updateNode)
    typ: StringProperty(name='typ', default='')
    newsock: BoolProperty(name='newsock', default=False)

    def draw_buttons(self, context, layout):
        layout.prop(self, "level", text="level")

    def sv_init(self, context):
        self.inputs.new('SvStringsSocket', "Data")
        self.outputs.new('SvStringsSocket', "Middl")
        self.outputs.new('SvStringsSocket', "First")
        self.outputs.new('SvStringsSocket', "Last")

    def sv_update(self):
        if self.inputs['Data'].links:
            inputsocketname = 'Data'
            outputsocketname = ["Middl", 'First', 'Last']
            changable_sockets(self, inputsocketname, outputsocketname)

    def process(self):
        if self.inputs['Data'].is_linked:
            data = self.inputs['Data'].sv_get(deepcopy=False)

            # blocking too height values of levels, reduce
            levels = levels_of_list_or_np(data)-1

            if levels >= self.level:
                levels = self.level-1
            elif levels < 1:
                levels = 0

            if self.outputs['First'].is_linked:
                out = self.count(data, levels, 0)
                self.outputs['First'].sv_set(out)
            if self.outputs['Middl'].is_linked:
                out = self.count(data, levels, 1)
                self.outputs['Middl'].sv_set(out)
            if self.outputs['Last'].is_linked:
                out = self.count(data, levels, 2)
                self.outputs['Last'].sv_set(out)

    def count(self, data, level, mode):
        out = []
        if level:
            for obj in data:
                out.append(self.count(obj, level-1, mode))
        elif isinstance(data, (tuple, list, ndarray)):
            if mode == 0:
                out.append(data[0])
            elif mode == 1 and len(data) >= 3:
                out = data[1:-1]
            elif mode == 2:
                out.append(data[-1])
            else:
                out = [[0]]
        return out


def register():
    bpy.utils.register_class(ListFLNode)


def unregister():
    bpy.utils.unregister_class(ListFLNode)
