Cycle monochrome light output with button press

ESPHome
1

Hi,
what code should use to perform different light output with one button?
For instance: have binary sensor on PIN12 and monochrome light. When first time press button want to turn light to 100%, second to 50%, third to turn off, four to 100% and run in cycle that.
Also when hold button want to dim light.
Here is part of code:

 - platform: gpio
    pin: 
      number: GPIO12      
      mode:
        input: true
        pullup: true
    name: "Wall switch hallway"
    id: wallswitch
    on_release:
      then:
        - light.toggle: 
            id: string_lights                 
    on_press:
      - while:
          condition:
            binary_sensor.is_on: wallswitch
          then:
            - light.dim_relative:
                id: string_lights
                relative_brightness: 5%
                transition_length: 0.1s
            - delay: 0.1s