import bpy

class MESH_OT_prepare_lods_decimate(bpy.types.Operator):
    """Copy current Mesh and apply decimate Modifier"""

    bl_idname = "mesh.prepare_lods_decimate"
    bl_label = "Copy current Mesh and apply decimate Modifier"
    bl_options = {"REGISTER", "UNDO"}
    
    def execute(self, context):
        
        #Selected Mesh
        obj = bpy.context.active_object
        
        if obj not in bpy.context.selected_objects or obj.type != "MESH":
            self.report({'WARNING'}, 'Select a Mesh to continue')
            return {"CANCELLED"}
        
        if not obj.name[:-1].endswith('LOD'):
            obj.name = obj.name + '_LOD0'
        
        LODnumber = context.scene.lod_slider #Get from Slider
        startLODcount = int(obj.name[-1])
        endLODcount = startLODcount + LODnumber
        
        for i in range (startLODcount + 1, endLODcount):
            new_obj = obj.copy()
            new_obj.data = obj.data.copy()
            new_obj.name = obj.name[:-1] + str(i)
            bpy.context.collection.objects.link(new_obj)
            
            for t in range (startLODcount, i):
                newModifierName = 'LOD_Decimate_' + str(t)
                new_obj.modifiers.new(type='DECIMATE', name=newModifierName)
                mod = new_obj.modifiers[newModifierName]
                mod.ratio = 0.49
                mod.use_collapse_triangulate = True
        
        self.report({'INFO'}, 'LOD´s created')
        return {"FINISHED"}