rules:

  # INFO / METADATA
  info-title-required:
    description: API title must be defined and follow the "Ariba Sourcing - {API Name}" pattern.
    severity: error
    given: $.info
    then:
      field: title
      function: truthy

  info-title-prefix:
    description: API title should start with "Ariba Sourcing".
    severity: warn
    given: $.info.title
    then:
      function: pattern
      functionOptions:
        match: "^Ariba Sourcing"

  info-description-required:
    description: API info must have a description.
    severity: error
    given: $.info
    then:
      field: description
      function: truthy

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

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

  # SERVERS
  servers-required:
    description: Servers must be defined.
    severity: error
    given: $
    then:
      field: servers
      function: truthy

  servers-https-only:
    description: All server URLs must use HTTPS.
    severity: error
    given: $.servers[*].url
    then:
      function: pattern
      functionOptions:
        match: "^https://"

  servers-openapi-ariba-host:
    description: Production server should use openapi.ariba.com host.
    severity: warn
    given: $.servers[*].url
    then:
      function: pattern
      functionOptions:
        match: "openapi\\.ariba\\.com"

  # PATHS
  paths-no-trailing-slash:
    description: Paths must not have a trailing slash.
    severity: warn
    given: $.paths[*]~
    then:
      function: pattern
      functionOptions:
        notMatch: "\\/$"

  # 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-prefix:
    description: Operation summaries should start with "Ariba Sourcing".
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].summary
    then:
      function: pattern
      functionOptions:
        match: "^Ariba Sourcing"

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

  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 should use camelCase.
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].operationId
    then:
      function: pattern
      functionOptions:
        match: "^[a-z][a-zA-Z0-9]*$"

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

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

  parameter-realm-required:
    description: SAP Ariba APIs require a realm query parameter.
    severity: info
    given: $.paths[*][get,post,put,patch,delete].parameters[?(@.name == 'realm')]
    then:
      function: truthy

  # REQUEST BODIES
  request-body-description-recommended:
    description: Request bodies should have a description.
    severity: warn
    given: $.paths[*][post,put,patch].requestBody
    then:
      field: description
      function: truthy

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

  response-401-recommended:
    description: Operations should define a 401 Unauthorized response.
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      field: '401'
      function: truthy

  response-500-recommended:
    description: Operations should define a 500 Internal Server Error response.
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].responses
    then:
      field: '500'
      function: truthy

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

  # SCHEMAS
  schema-property-description-recommended:
    description: Schema properties should have descriptions.
    severity: info
    given: $.components.schemas[*].properties[*]
    then:
      field: description
      function: truthy

  # SECURITY
  security-schemes-defined:
    description: Security schemes must be defined in components.
    severity: error
    given: $.components.securitySchemes
    then:
      function: truthy

  security-oauth2-token-url:
    description: OAuth2 token URL should use api.ariba.com.
    severity: warn
    given: $.components.securitySchemes.OAuth2.flows.clientCredentials.tokenUrl
    then:
      function: pattern
      functionOptions:
        match: "api\\.ariba\\.com"

  # RATE LIMITING
  rate-limits-documented:
    description: Rate limit information should be documented in the API description.
    severity: info
    given: $.info.description
    then:
      function: pattern
      functionOptions:
        match: "(?i)(rate limit|requests per)"

  # HTTP METHOD CONVENTIONS
  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
  microcks-operation-extension:
    description: Operations should include x-microcks-operation.
    severity: info
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: x-microcks-operation
      function: truthy