import bpy
from bpy.props import IntProperty, PointerProperty
from bpy.types import Panel, PropertyGroup, Operator
import random



class MyProperties(PropertyGroup):

    #This integer will hold the Random Number and then is displayed on the Panel.
    random_number : IntProperty(name= "Random Number", default= 0, min= 0, max= 2)

    #This is a list of Text. It will display one of these letters/strings depending
    #on the Random Number.
    text_list = ["A","B","C"]

    #This is a list of Icons. Just like the text_list, one icon will be displayed in
    #panel, depending on the Random Number.
    icon_list = ["GHOST_DISABLED", "MATERIAL", "PINNED"]





class ADDONNAME_PT_main_panel(Panel):
    bl_label = "Main Panel"
    bl_idname = "ADDONNAME_PT_main_panel"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = "New Tab"

    def draw(self, context):
        layout = self.layout
        scene = context.scene
        mytool = scene.my_tool

        #We are displaying the text_list and we are using the random_number
        #to select the index number.
        layout.label(text= mytool.text_list[mytool.random_number])

        #Just like the text_list, we are displaying the icon_list and we are
        #also using the random_number to select the index number.
        layout.label(icon= mytool.icon_list[mytool.random_number])

        #Here we are displaying the random_number property in our Panel.
        layout.prop(mytool, "random_number")

        #This is our Button that will call the Operator
        layout.operator("addonname.myop_operator")





class ADDONNAME_OT_my_op(Operator):
    bl_label = "Generate Random Number"
    bl_idname = "addonname.myop_operator"



    def execute(self, context):
        scene = context.scene
        mytool = scene.my_tool

        #In the Operators execute function, we can generate a random number.
        #For a Random Integer (whole) Number we need to use random.choice
        x = random.choice(range(0, 3))

        #Here we are telling our Custom Integer Property
        #(the one in our Property Group), to equal x.
        mytool.random_number = x

        #So when the button is pressed, it will generate a Random Number,
        #it will then change the Custom Integer Property to equal what ever
        #the Random Number is.
        return {'FINISHED'}




classes = [MyProperties, ADDONNAME_PT_main_panel, ADDONNAME_OT_my_op]



def register():
    for cls in classes:
        bpy.utils.register_class(cls)

        bpy.types.Scene.my_tool = PointerProperty(type= MyProperties)

def unregister():
    for cls in classes:
        bpy.utils.unregister_class(cls)
        del bpy.types.Scene.my_tool



if __name__ == "__main__":
    register()