blueprint:
  name: Fan Cadence with Light Check
  description: >
    Turns a fan on every X minutes for Y seconds, but only turns it off if none of the specified lights are on.
  domain: automation
  input:
    fan_entity:
      name: Fan Entity
      selector:
        entity:
          domain: fan

    interval_minutes:
      name: Interval Between Fan Cycles (minutes)
      default: 15
      selector:
        number:
          min: 1
          max: 1440
          unit_of_measurement: minutes

    duration_seconds:
      name: Fan On Duration (seconds)
      default: 60
      selector:
        number:
          min: 5
          max: 3600
          unit_of_measurement: seconds

    override_lights:
      name: Override Lights
      description: Fan will not turn off if any of these lights are on
      selector:
        entity:
          domain: light
          multiple: true

trigger:
  - platform: homeassistant
    event: start

variables:
  fan: !input fan_entity
  lights: !input override_lights
  interval: !input interval_minutes
  duration: !input duration_seconds

condition: []

action:
  - repeat:
      while: []
      sequence:
        - service: fan.turn_on
          target:
            entity_id: "{{ fan }}"
        - delay:
            seconds: "{{ duration }}"
        - condition: template
          value_template: >
            {{ expand(lights) | map(attribute='state') | select('eq', 'on') | list | length == 0 }}
        - service: fan.turn_off
          target:
            entity_id: "{{ fan }}"
        - delay:
            minutes: "{{ interval }}"

mode: restart