blueprint:
  name: Motion-activated Light with Optional Lux
  description: Turn on a light when motion is detected, optionally only if lux is below a threshold.
  domain: automation
  author: ChatGPT
  input:
    motion_entity:
      name: Motion Sensor
      selector:
        entity:
          filter:
            - device_class: occupancy
              domain: binary_sensor
            - device_class: motion
              domain: binary_sensor
    light_target:
      name: Light
      selector:
        target:
          entity:
            domain: light
    lux_entity:
      name: Lux Sensor (optional)
      default: ""
      selector:
        entity:
          domain: sensor
          device_class: illuminance
    lux_threshold:
      name: Lux Threshold
      description: Only turn on the light if lux is below this value.
      default: 50
      selector:
        number:
          min: 0
          max: 1000
          unit_of_measurement: lx
    no_motion_wait:
      name: Wait time
      description: Time to leave the light on after last motion is detected.
      default: 120
      selector:
        number:
          min: 0
          max: 3600
          unit_of_measurement: seconds

mode: restart
max_exceeded: silent

trigger:
  - platform: state
    entity_id: !input motion_entity
    from: "off"
    to: "on"

variables:
  lux_entity_var: !input lux_entity
  lux_threshold_var: !input lux_threshold
  target_entity: "{{ expand(!input light_target) | map(attribute='entity_id') | list | first }}"
  supports_brightness: >
    {{ 'brightness' in state_attr(target_entity, 'supported_color_modes') | default([]) }}

condition:
  - alias: "Optional lux check"
    condition: template
    value_template: >
      {% if lux_entity_var | length > 0 and states(lux_entity_var) not in ['unknown','unavailable','none',''] %}
        {{ states(lux_entity_var) | float(0) < lux_threshold_var | float(0) }}
      {% else %}
        true
      {% endif %}

action:
  - alias: "Set dynamic brightness"
    variables:
      max_brightness: 255
      sun_elevation: "{{ state_attr('sun.sun','elevation') | float(0) }}"
      current_lux: >
        {% if lux_entity_var | length > 0 %}
          {{ states(lux_entity_var) | float(0) }}
        {% else %}
          0
        {% endif %}
      brightness: >-
        {% set base = 50 %}
        {% if sun_elevation > 10 %}
          {% set base = 100 %}
        {% elif sun_elevation > 0 %}
          {% set base = 150 %}
        {% else %}
          {% set base = 200 %}
        {% endif %}
        {% if current_lux > 50 %}
          {% set base = base - ((current_lux / 500) * base) | int %}
        {% endif %}
        {{ [base, max_brightness] | min }}

  - alias: "Turn on the light safely"
    choose:
      - conditions:
          - condition: template
            value_template: "{{ supports_brightness }}"
        sequence:
          - service: light.turn_on
            target: !input light_target
            data:
              brightness: "{{ brightness }}"
    default:
      - service: light.turn_on
        target: !input light_target

  - alias: "Wait until there is no motion"
    wait_for_trigger:
      - platform: state
        entity_id: !input motion_entity
        from: "on"
        to: "off"

  - delay: !input no_motion_wait

  - alias: "Turn off the light"
    service: light.turn_off
    target: !input light_target