Wolfram|Alpha Short Answer with Detail Fallback

arazzo: 1.0.1
info:
  title: Wolfram|Alpha Short Answer with Detail Fallback
  summary: Get a concise short answer, falling back to full pod results when no short answer exists.
  description: >-
    Many Wolfram|Alpha queries can be answered with a single concise line, but
    some questions have no sufficiently short answer and return HTTP 501 from
    the Short Answers API. This workflow first asks the Short Answers API for a
    one-line result and, when that succeeds, returns it directly. When the Short
    Answers API reports that no short answer is available, the workflow falls
    back to the Full Results API to retrieve the complete set of computed pods
    so the caller still gets a usable, detailed response. Every step spells out
    its request inline so the flow can be read and executed without opening the
    underlying OpenAPI descriptions.
  version: 1.0.0
sourceDescriptions:
- name: shortAnswersApi
  url: ../openapi/wolframalpha-short-answers-api-openapi.yml
  type: openapi
- name: fullResultsApi
  url: ../openapi/wolframalpha-full-results-api-openapi.yml
  type: openapi
workflows:
- workflowId: short-answer-with-detail-fallback
  summary: Try the Short Answers API first, then fall back to Full Results when no short answer exists.
  description: >-
    Submits the query to the Short Answers API. On a 200 the concise answer is
    returned and the flow ends. On a 501 (no short answer available) the flow
    branches to the Full Results API for the complete pod data.
  inputs:
    type: object
    required:
    - appid
    - input
    properties:
      appid:
        type: string
        description: Wolfram|Alpha AppID used to authenticate every request.
      input:
        type: string
        description: The natural language query to answer (e.g. "How far is the Moon from Earth?").
      units:
        type: string
        description: Measurement system preference, either metric or imperial.
      timeout:
        type: integer
        description: Maximum processing time in seconds for each query.
  steps:
  - stepId: getShortAnswer
    description: >-
      Ask the Short Answers API for a single concise plain-text answer to the
      query. A 200 means a short answer is available; a 501 means none exists.
    operationId: queryShortAnswer
    parameters:
    - name: appid
      in: query
      value: $inputs.appid
    - name: i
      in: query
      value: $inputs.input
    - name: units
      in: query
      value: $inputs.units
    - name: timeout
      in: query
      value: $inputs.timeout
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      shortAnswer: $response.body
    onSuccess:
    - name: shortAnswerFound
      type: end
  - stepId: getFullResultsFallback
    description: >-
      When the Short Answers API has no concise answer, request the complete
      Full Results pods in JSON so the caller still receives a detailed result.
    operationId: queryFullResults
    parameters:
    - name: appid
      in: query
      value: $inputs.appid
    - name: input
      in: query
      value: $inputs.input
    - name: output
      in: query
      value: json
    - name: format
      in: query
      value: plaintext
    - name: units
      in: query
      value: $inputs.units
    - name: timeout
      in: query
      value: $inputs.timeout
    successCriteria:
    - condition: $statusCode == 200
    - condition: $response.body#/queryresult/success == true
    outputs:
      success: $response.body#/queryresult/success
      numpods: $response.body#/queryresult/numpods
      pods: $response.body#/queryresult/pods
  outputs:
    shortAnswer: $steps.getShortAnswer.outputs.shortAnswer
    fallbackPods: $steps.getFullResultsFallback.outputs.pods