openapi: "3.0.0"
info:
  version: 1.0.0
  title: Workflow Microservice
  license:
    name: MIT
servers:
  - url: http://localhost:5000/v1.0
paths:
  # /v1.0/workflows
  /workflows:
    get:
      operationId: api.workflows.list_all
      summary: List all workflows
      tags:
        - workflows
      parameters:
        - name: limit
          in: query
          description: How many items to return at one time (max 100)
          required: false
          schema:
            type: integer
            format: int32
      responses:
        '200':
          description: A paged array of workflows
          headers:
            x-next:
              description: A link to the next page of responses
              schema:
                type: string
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Workflows"
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Error"

  # /v1.0/workflows/0
  /workflows/{workflow_id}:
    get:
      operationId: api.workflows_tasks.start
      summary: Status info for a specific workflow instance
      tags:
        - workflows
      parameters:
        - name: workflow_id
          in: path
          required: true
          description: The id of the workflow to start
          schema:
            type: integer
            format: int32
      responses:
        '200':
          description: First task in the workflow
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Task"
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Error"

  # /v1.0/workflows/0/tasks/0
  /workflows/{workflow_id}/tasks/{task_id}:
    get:
      operationId: api.workflows_tasks.get
      summary: Get status of specific task in specific workflow instance
      tags:
        - workflows
      parameters:
        - name: workflow_id
          in: path
          required: true
          description: The id of the workflow
          schema:
            type: integer
            format: int32
        - name: task_id
          in: path
          required: true
          description: The id of the task
          schema:
            type: integer
            format: int32
      responses:
        '200':
          description: Expected response to a valid request
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Task"
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Error"

    post:
      operationId: api.workflows_tasks.post
      summary: Update data for a workflow task
      tags:
        - workflows
      parameters:
        - name: workflow_id
          in: path
          required: true
          description: The id of the workflow
          schema:
            type: integer
            format: int32
        - name: task_id
          in: path
          required: true
          description: The id of the task
          schema:
            type: integer
            format: int32
      requestBody:
        description: Task status to update
        content:
          application/json:
            schema:
              $ref: "#/components/schemas/Task"
      responses:
        '201':
          description: Null response
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Error"


components:
  schemas:
    Task:
      required:
        - name
      properties:
        id:
          readOnly: true
          type: integer
          format: int64
        name:
          type: string
        tag:
          type: string
      example:
        name: Do something useful
        tag: tasks
    Workflow:
      required:
        - name
      properties:
        id:
          readOnly: true
          type: integer
          format: int64
        name:
          type: string
        tag:
          type: string
      example:
        name: Full IRB Board Review
        tag: workflows
    Workflows:
      type: array
      items:
        $ref: "#/components/schemas/Workflow"
    Error:
      required:
        - code
        - message
      properties:
        code:
          type: integer
          format: int32
        message:
          type: string