blueprint:
  name: NAD M12 - Smart Power Follow
  description: >
    Tænder NAD-forstærkeren når én eller flere media_players bliver aktive,
    og slukker først når alle er slukkede.

  domain: automation

  input:
    media_players:
      name: Media Players
      description: >
        Vælg alle de media_players som skal kunne tænde NAD.
      selector:
        entity:
          domain: media_player
          multiple: true

    amplifier:
      name: NAD M12
      selector:
        entity:
          domain: media_player

    power_on_delay:
      name: Forsinkelse før tænd
      default: 0
      selector:
        number:
          min: 0
          max: 60
          unit_of_measurement: sek
          mode: box

    power_off_delay:
      name: Forsinkelse før sluk
      default: 30
      selector:
        number:
          min: 0
          max: 600
          unit_of_measurement: sek
          mode: box

mode: restart

trigger:
  - platform: state
    entity_id: !input media_players

variables:
  players: !input media_players

action:

  - variables:
      active_players: >
        {{
          expand(players)
          | rejectattr('state','in',
              ['off','unknown','unavailable'])
          | list
        }}

  - choose:

      ###################################################
      ## Min. én enhed er aktiv -> Tænd NAD
      ###################################################

      - conditions:
          - condition: template
            value_template: "{{ active_players | count > 0 }}"
        sequence:

          - delay:
              seconds: !input power_on_delay

          - service: media_player.turn_on
            target:
              entity_id: !input amplifier

      ###################################################
      ## Alle enheder er OFF -> Sluk NAD
      ###################################################

    default:

        - delay:
            seconds: !input power_off_delay

        - variables:
            active_players: >
              {{
                expand(players)
                | rejectattr('state','in',
                    ['off','unknown','unavailable'])
                | list
              }}

        - condition: template
          value_template: "{{ active_players | count == 0 }}"

        - service: media_player.turn_off
          target:
            entity_id: !input amplifier