blueprint:
  name: Dynamic Medication Reminder via NFC
  description: >
    Tracks medication intake via NFC scan.
    - If no person is selected, the scanner is assumed to be the taker.
    - If a person is selected manually (e.g. a child without mobile),
      the medication schedule resets for them, but the scanner gets the reminder.
    - Sends reminders again after a flexible interval (hours or days).
  domain: automation
  input:
    medication_name:
      name: Medication Name
      selector:
        text:
    nfc_tag_id:
      name: NFC Tag ID
      selector:
        text:
    reminder_delay:
      name: Reminder Interval
      selector:
        number:
          min: 1
          max: 168
    reminder_unit:
      name: Time Unit
      selector:
        select:
          options:
            - Hours
            - Days
    person_selector:
      name: input_select for manual person selection
      selector:
        entity:
          domain: input_select

trigger:
  - platform: event
    event_type: tag_scanned

condition:
  - condition: template
    value_template: >
      {{ trigger.event.data.tag_id == inputs.nfc_tag_id }}


variables:
  scanned_user_id: "{{ trigger.context.user_id }}"
  manual_person: "{{ states(inputs.person_selector) | lower }}"
  # Determine the "person" whose medication schedule should be reset
  person: >
    {% if manual_person != "no selection" %}
      {{ manual_person }}
    {% else %}
      {{ state_attr('user.' ~ scanned_user_id, 'friendly_name') | lower }}
    {% endif %}
  # Calculate the delay in seconds
  delay_seconds: >
    {% if inputs.reminder_unit == 'Days' %}
      {{ (inputs.reminder_delay | int) * 86400 }}
    {% else %}
      {{ (inputs.reminder_delay | int) * 3600 }}
    {% endif %}
  datetime_entity: "input_datetime.medication_{{ person }}"
  # Determine notification target: always the scanner's device
  notify_service: >
    {% set scanner_device = "notify.mobile_app_" ~ state_attr('user.' ~ scanned_user_id, 'device_name') | lower %}
    {{ scanner_device }}

action:
  - service: input_datetime.set_datetime
    target:
      entity_id: "{{ datetime_entity }}"
    data:
      timestamp: "{{ now().timestamp() }}"

  - delay:
      seconds: "{{ delay_seconds }}"

  - service: "{{ notify_service }}"
    data:
      message: "{{ inputs.medication_name }} is due again for {{ person | title }}."

  - service: input_select.select_option
    target:
      entity_id: !input person_selector
    data:
      option: "No selection"