Set Alexa alarm from Home Assistant frontend with selectable echo device

set_alexa_alarm_via_ha.yaml

###PREREQUISITES-------------------------
# This function relies on the Alexa Media Player add-on available for install through HACS
#
# You will need to create the following helpers:
#   - input_select.alexa_alarm_selector
#     This selector needs to have a name for every echo device you want to use.
#   - input_datetime.alexa_alarm_set
#
# The "alexa_alarm_template" sensor leverages quirks of the English language in order to emulate
# a voice command.  As such, it will likely not work if your Alexa devices are set to another language.


### SCRIPTS -----------------------------
set_alexa_alarm:
  alias: Set Alexa Alarm
  sequence:
#  - service: input_datetime.set_datetime
  - service: media_player.play_media
    data_template:
      entity_id: '{{ states("sensor.alexa_alarm_selector") }}'
      media_content_id: Set alarm for {{ state_attr("sensor.alexa_alarm_template", "alarm_hour") }}, {{ state_attr("sensor.alexa_alarm_template", "alarm_minute") }}
      media_content_type: custom

cancel_alexa_alarm:
  alias: Cancel Alexa Alarm
  sequence:
  - service: media_player.play_media
    data_template:
      entity_id: '{{ states("sensor.alexa_alarm_selector") }}'
      media_content_id: 'Cancel {{ states(''input_datetime.alexa_alarm_set'') }} alarm'
      media_content_type: custom

###SENSORS -----------------------------

template:
  sensor:
    - name: "alexa_alarm_selector"
          state: >-
            {%- set room = states("input_select.alexa_alarm_selector") -%}
            {% set echo_select = dict([
                ('Kitchen Dot', 'kitchen_dot'),
                ('All', 'everywhere'),
                ('Living Room Dot', 'amanda_s_living_room_dot')
            ]) %}
            {%- if room in echo_select -%}
              media_player.{{ echo_select[room] }}
            {%- endif %}
    - name: "alexa_alarm_template"
          state: >
            Set alarm for {{state_attr("sensor.alexa_alarm_template", "alarm_hour")}} {{state_attr("sensor.alexa_alarm_template", "alarm_minute")}} {{state_attr("sensor.alexa_alarm_template", "am_pm")}}
          attributes:
            alarm_hour: >
              {{ state_attr("input_datetime.alexa_alarm_set", "hour") }}
            alarm_minute: >
              {% if state_attr("input_datetime.alexa_alarm_set", "minute")|int <= 1 %}
                hundred hours
              {% elif 0 < state_attr("input_datetime.alexa_alarm_set", "minute")|int < 10 %}
                {% set alarm_minute_post = state_attr("input_datetime.alexa_alarm_set", "minute") %}
                {% set alarm_minute_pre = "Oh" %}
                {{ [alarm_minute_pre, alarm_minute_post]|join(' ') }}
              {% else%}
                {{ state_attr("input_datetime.alexa_alarm_set", "minute") }}
              {% endif %}
            am_pm: >
              {% if (state_attr("input_datetime.alexa_alarm_set", "hour")|int <= 12) and (state_attr("input_datetime.alexa_alarm_set", "minute")|int > 0)%}
                in the morning
              {% endif %}


### LOVELACE: Manual Card -----------------------------
# Note: The input_datetime must be in it's own entity card 
# it will not work if it is put in the "entities" card with the selector and execution buttons

type: vertical-stack
cards:
  - type: 'custom:button-card'
    color_type: label-card
    color: var(--primary-color)
    name: Alexa Alarm
    styles:
      name:
        - font-weight: bold
        - color: var(--primary-background-color)
  - type: entity
    entity: input_datetime.alexa_alarm_set
    name: Enter Alarm Time Here
  - entities:
      - entity: input_select.alexa_alarm_selector
        name: Select Alexa Device
      - action_name: Set Alarm
        icon: 'mdi:voice'
        name: ' '
        service: script.set_alexa_alarm
        type: call-service
      - action_name: Cancel Alarm
        icon: 'mdi:voice'
        name: ' '
        service: script.cancel_alexa_alarm
        type: call-service
    type: entities