import bpy
import bmesh
import operator
from mathutils import Vector
from collections import defaultdict
from math import pi
import math

from . import utilities_meshtex


def is_available():
    # If the selection contains a boolean modifier
    obj_textures = utilities_meshtex.find_texture_meshes(bpy.context.selected_objects)
    for obj in obj_textures:
        for modifier in obj.modifiers:
             if modifier.type == 'BOOLEAN':
                 return True
    return False


class op(bpy.types.Operator):
    bl_idname = "uv.textools_meshtex_trimcollapse"
    bl_label = "Collapse"
    bl_description = "Trim Mesh Texture"
    bl_options = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        if not bpy.context.active_object or bpy.context.active_object.mode != 'OBJECT':
            return False
        
        return is_available()

    def execute(self, context):
        collapse(self)
        return {'FINISHED'}



def collapse(self):
    # Collect texture meshes
    obj_textures = utilities_meshtex.find_texture_meshes( bpy.context.selected_objects )
    

    previous_selection = bpy.context.selected_objects.copy()
    previous_active    = bpy.context.view_layer.objects.active

    if len(obj_textures) == 0:
        self.report({'ERROR_INVALID_INPUT'}, "No meshes found for mesh textures" )
        return

    # Apply bool modifier to trim
    for obj in obj_textures:
        bpy.ops.object.select_all(action='DESELECT')
        obj.select_set( state = True, view_layer = None)
        bpy.context.view_layer.objects.active = obj
        bpy.ops.object.convert(target='MESH')

    # restore selection
    bpy.ops.object.select_all(action='DESELECT')
    for obj in previous_selection:
        obj.select_set( state = True, view_layer = None)
    bpy.context.view_layer.objects.active = previous_active


    bpy.ops.ui.textools_popup('INVOKE_DEFAULT', message="{}x objects have been collapsed".format(len(obj_textures)))


bpy.utils.register_class(op)