rules:

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

  info-description-required:
    description: API info must have a description with sufficient detail
    severity: warn
    given: $.info
    then:
      field: description
      function: truthy

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

  info-contact-required:
    description: API info should have contact information
    severity: warn
    given: $.info
    then:
      field: contact
      function: truthy

  info-license-required:
    description: Open data APIs must declare their license (CC0 for Wikidata)
    severity: warn
    given: $.info
    then:
      field: license
      function: truthy

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

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

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

  servers-description:
    description: Each server must have a description
    severity: warn
    given: $.servers[*]
    then:
      field: description
      function: truthy

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

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

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

  operation-description-required:
    description: All operations should have a description
    severity: warn
    given: $.paths[*][get,post,put,patch,delete,head,options]
    then:
      field: description
      function: truthy

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

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

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

  operation-summary-wikidata-prefix:
    description: Operation summaries should start with provider name "Wikidata"
    severity: info
    given: $.paths[*][get,post,put,patch,delete,head,options].summary
    then:
      function: pattern
      functionOptions:
        match: "^Wikidata "

  # TAGS
  tags-global-defined:
    description: Global tags array must be defined
    severity: warn
    given: $
    then:
      field: tags
      function: truthy

  tags-description-required:
    description: Global tags must have descriptions
    severity: warn
    given: $.tags[*]
    then:
      field: description
      function: truthy

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

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

  # REQUEST BODIES
  request-body-content-required:
    description: Request bodies must define content
    severity: error
    given: $.paths[*][post,put,patch].requestBody
    then:
      field: content
      function: truthy

  # RESPONSES
  response-success-required:
    description: Every operation must define at least one 2xx response
    severity: error
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: responses
      function: schema
      functionOptions:
        schema:
          type: object
          minProperties: 1

  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

  response-401-for-authenticated:
    description: Authenticated operations should define a 401 response
    severity: warn
    given: $.paths[*][post,put,patch,delete]
    then:
      field: responses
      function: schema
      functionOptions:
        schema:
          type: object

  # SCHEMAS — PROPERTY NAMING
  schema-description-required:
    description: Top-level component schemas should have a description
    severity: info
    given: $.components.schemas[*]
    then:
      field: description
      function: truthy

  schema-properties-types:
    description: Schema properties should define a type
    severity: warn
    given: $.components.schemas[*].properties[*]
    then:
      field: type
      function: truthy

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

  security-scheme-description:
    description: Security schemes should have descriptions
    severity: info
    given: $.components.securitySchemes[*]
    then:
      field: description
      function: truthy

  # 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

  delete-no-required-body:
    description: DELETE operations should return 200 or 204
    severity: info
    given: $.paths[*].delete
    then:
      field: responses
      function: truthy

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

  examples-encouraged:
    description: Schema properties should have example values
    severity: info
    given: $.components.schemas[*].properties[*]
    then:
      field: example
      function: truthy