rules:

  # INFO / METADATA
  info-title-required:
    description: Info must have a title
    message: OpenAPI spec must have a title in info
    severity: error
    given: $.info
    then:
      field: title
      function: truthy

  info-description-required:
    description: Info must have a description
    message: OpenAPI spec must have a description in info
    severity: warn
    given: $.info
    then:
      field: description
      function: truthy

  info-version-required:
    description: Info must have a version
    message: OpenAPI spec must have a version
    severity: error
    given: $.info
    then:
      field: version
      function: truthy

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

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

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

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

  paths-no-trailing-slash:
    description: Paths must not have trailing slashes
    message: "Path must not end with a trailing slash: {{value}}"
    severity: warn
    given: $.paths[*]~
    then:
      function: pattern
      functionOptions:
        notMatch: "\\/$"

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

  operation-operationId-snake-case:
    description: OperationId must use snake_case
    message: "OperationId must use snake_case: {{value}}"
    severity: warn
    given: $.paths[*][get,post,put,delete,patch].operationId
    then:
      function: pattern
      functionOptions:
        match: "^[a-z][a-z0-9_]*$"

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

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

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

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

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

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

  # SCHEMAS
  schema-type-required:
    description: Schema properties must define a type
    message: Schema must have a type defined
    severity: warn
    given: $.components.schemas[*]
    then:
      field: type
      function: truthy

  schema-description-recommended:
    description: Schemas should have descriptions
    message: Schema should have a description
    severity: info
    given: $.components.schemas[*]
    then:
      field: description
      function: truthy

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

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

  delete-no-request-body:
    description: DELETE operations should not have a request body
    message: DELETE operation should not have a requestBody
    severity: warn
    given: $.paths[*].delete
    then:
      field: requestBody
      function: falsy

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

  contact-info-recommended:
    description: Info should have contact details
    message: Info should include contact information
    severity: info
    given: $.info
    then:
      field: contact
      function: truthy

  external-docs-recommended:
    description: Spec should have external documentation link
    message: Spec should include externalDocs
    severity: info
    given: $
    then:
      field: externalDocs
      function: truthy