blueprint:
  name: Best power price
  description: Returns the best average block of power. The block size is variable. You can ask for the minimum or maximum.
  domain: script

fields:
  entity_id:
    name: Amber Forecast Price
    description: The Amber price forecast sensor to use. If in doubt, use the general forecast.
    required: true
    selector:
      entity:
        integration: amberelectric
        domain: sensor

  block_size:
    name: Block size
    description: The size of the block in hours.
    required: true
    default: 1
    selector:
      number:

  min_max:
    name: Cheapest or most expensive?
    description: Would you like to see the cheapest or most expensive block?
    default: min
    required: true
    selector:
      select:
        options:
          - label: Cheapest
            value: min
          - label: Most expensive
            value: max

sequence:
  - variables:
      intervals: "{{ block_size * 2 }}"
      prices: >-
        {{ state_attr(entity_id, 'forecasts') |
        map(attribute='per_kwh') | list }}
      averages: >
        {% set data = namespace(averages=[]) %}  
        {% for index in range(prices|count - intervals) %}
          {% set data.averages = data.averages + [(prices[index:index+intervals] | average)] %}
        {% endfor %} {{data.averages}}
      interval_index: >
        {% if min_max == "max" %}
          {{averages.index(averages | max)}}
        {% else %}  
          {{averages.index(averages | min)}}
        {% endif %}
      price: "{{(averages[interval_index] * 100) | round | int}}"
      response:
        block_size: "{{ block_size }}"
        starts_in_hours: "{{ interval_index / 2 }}"
        cents_per_kwh: "{{ price }}"
        min_max: >
          {% if min_max == "max" %}
            max
          {% else %}
            min
          {% endif %}
  - stop: Returning values
    response_variable: response