import bpy

class MESH_OT_fix_material_names(bpy.types.Operator):
    """Fixes the material naming, if duplicated are present e.g. Material.001, Material.002 ..."""

    bl_idname = "mesh.fix_material_names"
    bl_label = "Fixes the material naming, if duplicated are present"
    bl_options = {"REGISTER", "UNDO"}
    
    def execute(self, context):
        #Remove all duplicated materials
        self.merge_duplicated_materials()
        
        #Merge material slots for every mesh in the scene
        #for obj in bpy.context.scene.objects:
            #if obj.type == "MESH":
                #self.merge_material_slots(obj)
        
        self.report({'INFO'}, 'All duplicated Materials fixed')
        return {"FINISHED"}
    
    def merge_duplicated_materials(self):
        for material in bpy.data.materials:
            if material.name[-3].isnumeric():
                opti_matName = material.name[:-4]
                if bpy.data.materials.get(opti_matName): #check if og_mat exists
                    material.user_remap(bpy.data.materials.get(opti_matName))
                    print("Removed Material: " + material.name)
                    bpy.data.materials.remove(material)
                else:
                    material.name = opti_matName
                    
    def merge_material_slots(self, obj):
        duplicated_material_list = []
        
        #create list with indexes of material slots with the same name
        for og_slot in obj.material_slots:
            for slot in obj.material_slots:
                if slot.name == og_slot.name:
                    if slot.slot_index == og_slot.slot_index:
                        continue
                    if og_slot.slot_index in duplicated_material_list:
                        continue
                    duplicated_material_list.append(int(slot.slot_index))
        
        #delete all material slots within list
        for slot_index in sorted(duplicated_material_list, reverse=True):
            obj.data.materials.pop(index = slot_index)