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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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#  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.
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#  along with this program; if not, write to the Free Software Foundation,
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# ##### END GPL LICENSE BLOCK #####

import bpy
from bpy.props import EnumProperty, StringProperty, BoolProperty
from mathutils import Vector

from sverchok.node_tree import SverchCustomTreeNode
from sverchok.data_structure import (updateNode, list_match_func, numpy_list_match_modes, iter_list_match_func,
                                     no_space)
from sverchok.utils.sv_itertools import recurse_f_level_control
from sverchok.utils.modules.color_utils import color_channels

class EmptyTexture():
    def evaluate(self, vec):
        return [1, 1, 1, 1]

def texture_evaluate(params, mapper_func, extract_func):
    vertex, texture = params
    v_vertex = mapper_func(vertex)
    col = texture.evaluate(v_vertex)
    eval_s = extract_func(col)
    return eval_s


def meshes_texture_evaluate(params, constant, matching_f):
    '''
    This function prepares the data to pass to the evaluate function.

    params are verts, texture,
    - verts should be list as [[[float, float, float],],] (Level 3)
    - texture can be [texture, texture] or [[texture, texture],[texture]] for per vertex texture

    desired_levels = [3, 2 or 3]
    constant are the function options (data that does not need to be matched)
    matching_f stands for list matching formula to use
    '''
    result = []
    color_channel, mapping_mode, match_mode = constant
    params = matching_f(params)
    local_match = iter_list_match_func[match_mode]
    mapper_func = mapper_funcs[mapping_mode]
    extract_func = color_channels[color_channel][1]
    for props in zip(*params):
        verts, texture = props
        if  not type(texture) == list:
            texture = [texture]
        m_texture = local_match([texture])[0]
        result.append([texture_evaluate(v_prop, mapper_func, extract_func) for v_prop in zip(verts, m_texture)])

    return result

color_channels_modes = [(no_space(t), t, t, '', color_channels[t][0]) for t in color_channels if not t == 'RGBA']

mapper_funcs = {
    'UV': lambda v_uv: Vector((v_uv[0]*2-1, v_uv[1]*2-1, v_uv[2])),
    'Object': lambda v: Vector(v),
}


class SvTextureEvaluateNode(bpy.types.Node, SverchCustomTreeNode):
    """
    Triggers: Scence Texture In
    Tooltip: Evaluate Scene texture at input coordinates

    """

    bl_idname = 'SvTextureEvaluateNode'
    bl_label = 'Texture Evaluate'
    bl_icon = 'FORCE_TEXTURE'
    is_animation_dependent = True
    texture_coord_modes = [
        ('UV', 'UV coordinates', 'Input UV coordinates to evaluate texture. (0 to 1 as domain)', '', 1),
        ('Object', 'Object', 'Input Object coordinates to evaluate texture. (-1 to 1 as domain)', '', 2),

    ]

    replacement_nodes = [('SvTextureEvaluateNodeMk2', None, None)]

    def change_mode(self, context):
        outputs = self.outputs
        if self.color_channel not in ['Color', 'RGBA']:
            outputs[0].replace_socket('SvStringsSocket', 'Value')
        else:
            outputs[0].replace_socket('SvColorSocket', 'Color')
        updateNode(self, context)

    name_texture: StringProperty(
        name='Texture',
        description='texture name',
        default='',
        update=updateNode)

    color_channel: EnumProperty(
        name='Component',
        items=color_channels_modes,
        default='Alpha',
        description="Channel to use from texture",
        update=change_mode)

    tex_coord_type: EnumProperty(
        name='Texture Coord',
        items=texture_coord_modes,
        default='Object',
        description="Mapping method",
        update=change_mode)

    use_alpha: BoolProperty(default=False, update=updateNode)

    list_match: EnumProperty(
        name="List Match",
        description="Behavior on different list lengths",
        items=numpy_list_match_modes, default="REPEAT",
        update=updateNode)

    def sv_init(self, context):
        self.width = 200
        self.inputs.new('SvVerticesSocket', 'Vertices')
        self.inputs.new('SvStringsSocket', 'Texture').custom_draw = 'draw_texture_socket'

        self.outputs.new('SvStringsSocket', 'Value')


    def draw_texture_socket(self, socket, context, layout):
        if not socket.is_linked:
            c = layout.split(factor=0.33, align=False)
            c.label(text=socket.name+ ':')

            c.prop_search(self, "name_texture", bpy.data, 'textures', text="")
        else:
            layout.label(text=socket.name+ '. ' + str(socket.objects_number))

    def sv_draw_buttons(self, context, layout):
        self.draw_animatable_buttons(layout, icon_only=True)
        b = layout.split(factor=0.33, align=True)
        b.label(text='Mapping:')
        b.prop(self, 'tex_coord_type', expand=False, text='')
        c = layout.split(factor=0.33, align=True)
        c.label(text='Channel:')
        c.prop(self, 'color_channel', text="")
        if self.color_channel == 'Color':
            layout.prop(self, 'use_alpha', text="Use Alpha")

    def sv_draw_buttons_ext(self, context, layout):
        '''draw buttons on the N-panel'''
        self.draw_buttons(context, layout)
        layout.prop(self, 'list_match', expand=False)

    def rclick_menu(self, context, layout):
        self.node_replacement_menu(context, layout)
        layout.prop_menu_enum(self, "list_match", text="List Match")

    def process(self):
        inputs, outputs = self.inputs, self.outputs

        if not outputs[0].is_linked:
            return

        result = []

        params = []
        params.append(inputs[0].sv_get(default=[[]], deepcopy=False))
        if not inputs[1].is_linked:
            if not self.name_texture:
                params.append([[EmptyTexture()]])
            else:
                params.append([[self.get_bpy_data_from_name(self.name_texture, bpy.data.textures)]])
        else:
            params.append(inputs[1].sv_get(default=[[]], deepcopy=False))


        matching_f = list_match_func[self.list_match]
        desired_levels = [3, 2]
        if self.color_channel == 'Color' and self.use_alpha:
            channel = 'RGBA'
        else:
            channel = self.color_channel

        ops = [channel, self.tex_coord_type, self.list_match]

        result = recurse_f_level_control(params, ops, meshes_texture_evaluate, matching_f, desired_levels)

        self.outputs[0].sv_set(result)



    def draw_label(self):
        if self.hide:
            if not self.inputs['Texture'].is_linked:
                texture = ' ' + self.name_texture
            else:
                texture = ' + texture(s)'
            return 'Displace' + texture +' ' + self.color_channel.title() + ' channel'
        else:
            return self.label or self.name

classes = [SvTextureEvaluateNode]
register, unregister = bpy.utils.register_classes_factory(classes)
