rules:

  # INFO / METADATA
  info-title-required:
    description: API info title must be present
    severity: error
    given: $.info
    then:
      field: title
      function: truthy

  info-title-apple-prefix:
    description: API title should start with "Apple Keynote"
    severity: warn
    given: $.info
    then:
      field: title
      function: pattern
      functionOptions:
        match: "^Apple Keynote"

  info-version-required:
    description: API version must be specified
    severity: error
    given: $.info
    then:
      field: version
      function: truthy

  info-description-required:
    description: API description must be present with minimum length
    severity: warn
    given: $.info
    then:
      field: description
      function: minLength
      functionOptions:
        min: 20

  # OPENAPI VERSION
  openapi-version-3:
    description: OpenAPI version must be 3.0.x
    severity: error
    given: $
    then:
      field: openapi
      function: pattern
      functionOptions:
        match: "^3\\.0\\."

  # SERVERS
  servers-required:
    description: At least one server must be defined
    severity: error
    given: $
    then:
      field: servers
      function: truthy

  servers-https:
    description: Server URLs must use HTTPS
    severity: warn
    given: $.servers[*]
    then:
      field: url
      function: pattern
      functionOptions:
        match: "^https://"

  # PATHS — NAMING
  paths-kebab-case:
    description: Path segments must use kebab-case
    severity: warn
    given: $.paths
    then:
      field: "@key"
      function: pattern
      functionOptions:
        match: "^(/[a-z0-9{}/_-]+)+$"

  paths-no-trailing-slash:
    description: Paths must not end with a trailing slash
    severity: warn
    given: $.paths
    then:
      field: "@key"
      function: pattern
      functionOptions:
        notMatch: "/$"

  # OPERATIONS
  operation-summary-required:
    description: Every operation must have a summary
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: summary
      function: truthy

  operation-summary-apple-prefix:
    description: Operation summary must start with "Apple Keynote"
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: summary
      function: pattern
      functionOptions:
        match: "^Apple Keynote"

  operation-id-required:
    description: Every operation must have an operationId
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: operationId
      function: truthy

  operation-id-camel-case:
    description: OperationId must use camelCase
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: operationId
      function: pattern
      functionOptions:
        match: "^[a-z][a-zA-Z0-9]+$"

  operation-description-required:
    description: Every operation must have a description
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: description
      function: truthy

  operation-tags-required:
    description: Every operation must have tags
    severity: warn
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: tags
      function: truthy

  # PARAMETERS
  parameter-description-required:
    description: Every parameter must have a description
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].parameters[*]
    then:
      field: description
      function: truthy

  # RESPONSES
  operation-success-response-required:
    description: Every operation must have a 2xx response
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      function: schema
      functionOptions:
        schema:
          anyOf:
            - required: ['200']
            - required: ['201']
            - required: ['204']

  response-description-required:
    description: Every response must have a description
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses[*]
    then:
      field: description
      function: truthy

  # SCHEMAS
  schema-title-required:
    description: Component schemas must have a title
    severity: warn
    given: $.components.schemas[*]
    then:
      field: title
      function: truthy

  schema-description-required:
    description: Component schemas should have a description
    severity: warn
    given: $.components.schemas[*]
    then:
      field: description
      function: truthy

  # HTTP METHOD CONVENTIONS
  http-get-no-request-body:
    description: GET operations must not have a request body
    severity: error
    given: $.paths[*].get
    then:
      field: requestBody
      function: falsy

  # GENERAL QUALITY
  no-empty-descriptions:
    description: Descriptions must not be empty strings
    severity: warn
    given: $..description
    then:
      function: pattern
      functionOptions:
        match: ".+"