Create Calendar Events with Offset Holidays

calendar_copy_offset_holidays.yaml

blueprint:
  name: Create Calendar Events with Offset Holidays
  description: >-
    Copy Events (in the next 365 days) from one local calendar to another. 
    Look in the holidays calendar and shift events colliding with a public 
    holiday forward.
  domain: script
  source_url: https://gist.github.com/bruxy70/fc31c7695541e94d0215a075aaa49521
fields:
  source_calendar:
    name: Source calendar
    description: Calendar with the events to be copied from
    required: true
    selector:
      entity:
        filter:
          integration: local_calendar
  destination_calendar:
    name: Destination calendar
    description: Calendar for the events to be copied to
    required: true
    selector:
      entity:
        filter:
          integration: local_calendar
  public_holidays:
    name: Public Holidays
    description: Calendar with the public holidays to be avoided
    required: true
    selector:
      entity:
        filter:
          integration: holidays
sequence:
  - service: calendar.list_events
    data:
      duration:
        days: 365
    target:
      entity_id: "{{ source_calendar }}"
    response_variable: source
  - service: calendar.list_events
    data:
      duration:
        days: 365
    target:
      entity_id: "{{ destination_calendar }}"
    response_variable: destination
  - service: calendar.list_events
    data:
      duration:
        days: 365
    target:
      entity_id: "{{ public_holidays }}"
    response_variable: holidays
  - variables:
      holiday_dates: |-
        {%- set ns = namespace(dates={}) %}
        {%- if holidays.events %}
          {%- for event in holidays.events %}
            {%- set ns.dates = dict(ns.dates, **{event.start:event.summary}) %}
          {%- endfor %}
        {%- endif %}
        {{ ns.dates }}
      destination_dates: |-
        {%- set ns = namespace(dates={}) %}
        {%- if destination.events %}
          {%- for event in destination.events %}
            {%- set ns.dates = dict(ns.dates, **{event.start:event.summary}) %}
          {%- endfor %}
        {%- endif %}
        {{ ns.dates }}
  - repeat:
      for_each: "{{ source.events }}"
      sequence:
        - variables:
            offset: >-
              {%- set ns = namespace(offset=0, found=false) %}

              {# Increase offset until we find a date that is not public holiday
              #}

              {%- for _ in range(7) if not ns.found %}
                {%- set start = strptime(repeat.item.start,"%Y-%m-%d").date() %}
                {%- set d = ( start + timedelta( days=ns.offset) ).isoformat() %}
                {%- if d in holiday_dates %}
                  {%- set ns.offset = ns.offset + 1 %}
                {% else %}
                  {%- set ns.found = true %}
                {%- endif %}
              {% endfor %}
              {{ ns.offset }}
            start_date: >-
              {%- set start = strptime(repeat.item.start,"%Y-%m-%d").date() %}
              {{ (start + timedelta(days=offset)).isoformat() }}
            end_date: >-
              {%- set end = strptime(repeat.item.end,"%Y-%m-%d").date() %}
              {{ (end + timedelta(days=offset)).isoformat() }}
            summary: "{{ repeat.item.summary }}"
        - if:
            - condition: template
              value_template: "{{ start_date not in destination_dates }}"
          then:
            - service: calendar.create_event
              data:
                summary: "{{ summary }}"
                start_date: "{{ start_date }}"
                end_date: " {{ end_date }}"
              target:
                entity_id: "{{ destination_calendar }}"
mode: single
icon: mdi:calendar-blank-multiple