# =============================================================================
# Workday Studio Spectral Ruleset
# =============================================================================
# Opinionated rules derived from the Workday Studio OpenAPI specifications:
#   - openapi/workday-studio-integration-openapi.yml
#   - openapi/workday-studio-web-services-openapi.yml
#
# Run with:
#   spectral lint -r rules/workday-studio-spectral-rules.yml openapi/*.yml
# =============================================================================

rules:

  # ===========================================================================
  # INFO / METADATA
  # ===========================================================================

  info-title-required:
    description: The info object must include a title.
    message: "info.title is required."
    severity: error
    given: "$.info"
    then:
      field: title
      function: truthy

  info-title-workday-studio-prefix:
    description: API title should start with "Workday Studio".
    message: 'info.title should begin with "Workday Studio" (got "{{value}}").'
    severity: warn
    given: "$.info.title"
    then:
      function: pattern
      functionOptions:
        match: "^Workday Studio\\b"

  info-description-required:
    description: The info object must include a description.
    message: "info.description is required."
    severity: error
    given: "$.info"
    then:
      field: description
      function: truthy

  info-description-min-length:
    description: info.description should provide meaningful context (>= 100 chars).
    message: "info.description should be at least 100 characters."
    severity: warn
    given: "$.info.description"
    then:
      function: length
      functionOptions:
        min: 100

  info-version-required:
    description: The info object must include a version.
    message: "info.version is required."
    severity: error
    given: "$.info"
    then:
      field: version
      function: truthy

  info-contact-required:
    description: A contact object should be defined for support.
    message: "info.contact should be defined."
    severity: warn
    given: "$.info"
    then:
      field: contact
      function: truthy

  info-contact-email-workday:
    description: Contact email should be the Workday API support address.
    message: "info.contact.email should be api-support@workday.com."
    severity: info
    given: "$.info.contact.email"
    then:
      function: pattern
      functionOptions:
        match: "^api-support@workday\\.com$"

  info-license-required:
    description: A license object should be defined.
    message: "info.license should be defined."
    severity: warn
    given: "$.info"
    then:
      field: license
      function: truthy

  info-terms-of-service-recommended:
    description: termsOfService should be set on info.
    message: "info.termsOfService should be defined."
    severity: info
    given: "$.info"
    then:
      field: termsOfService
      function: truthy

  # ===========================================================================
  # OPENAPI VERSION
  # ===========================================================================

  openapi-version-3-1:
    description: Specs in this repo must declare OpenAPI 3.1.0.
    message: 'openapi must be "3.1.0" (got "{{value}}").'
    severity: error
    given: "$.openapi"
    then:
      function: pattern
      functionOptions:
        match: "^3\\.1\\.0$"

  # ===========================================================================
  # SERVERS
  # ===========================================================================

  servers-defined:
    description: At least one server must be defined.
    message: "servers must be defined and non-empty."
    severity: error
    given: "$"
    then:
      field: servers
      function: truthy

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

  servers-description-required:
    description: Every server must include a description.
    message: "Each server should have a description."
    severity: warn
    given: "$.servers[*]"
    then:
      field: description
      function: truthy

  servers-tenant-templated:
    description: Server URLs should template both baseUrl and tenant variables.
    message: 'Server URL should include {baseUrl} and {tenant} variables (got "{{value}}").'
    severity: warn
    given: "$.servers[*].url"
    then:
      function: pattern
      functionOptions:
        match: "\\{baseUrl\\}.*\\{tenant\\}"

  # ===========================================================================
  # PATHS — NAMING CONVENTIONS
  # ===========================================================================

  paths-allowed-character-set:
    description: >-
      Paths may use camelCase (e.g. /integrationSystems) or Workday SOAP-style
      PascalCase_With_Underscores (e.g. /Human_Resources/Get_Workers). No spaces,
      hyphens, or other special characters.
    message: 'Path "{{property}}" contains disallowed characters.'
    severity: error
    given: "$.paths"
    then:
      field: "@key"
      function: pattern
      functionOptions:
        match: "^(/[A-Za-z][A-Za-z0-9_]*|/\\{[A-Za-z][A-Za-z0-9]*\\})+$"

  paths-no-trailing-slash:
    description: Paths must not end with a trailing slash (except the root).
    message: 'Path "{{property}}" should not end with a trailing slash.'
    severity: error
    given: "$.paths"
    then:
      field: "@key"
      function: pattern
      functionOptions:
        notMatch: ".+/$"

  paths-no-query-strings:
    description: Path templates must not include query strings.
    message: 'Path "{{property}}" must not contain "?" — use parameters instead.'
    severity: error
    given: "$.paths"
    then:
      field: "@key"
      function: pattern
      functionOptions:
        notMatch: "\\?"

  paths-no-file-extensions:
    description: Paths should not include file extensions.
    message: 'Path "{{property}}" should not include a file extension.'
    severity: warn
    given: "$.paths"
    then:
      field: "@key"
      function: pattern
      functionOptions:
        notMatch: "\\.(json|xml|yaml|yml)$"

  # ===========================================================================
  # OPERATIONS
  # ===========================================================================

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

  operation-summary-workday-studio-prefix:
    description: Operation summaries should begin with "Workday Studio ".
    message: 'Operation summary should start with "Workday Studio " (got "{{value}}").'
    severity: warn
    given: "$.paths[*][get,post,put,patch,delete,head,options].summary"
    then:
      function: pattern
      functionOptions:
        match: "^Workday Studio\\s+\\S"

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

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

  operation-operationId-camelcase:
    description: operationId must be camelCase.
    message: 'operationId "{{value}}" must be camelCase.'
    severity: error
    given: "$.paths[*][get,post,put,patch,delete,head,options].operationId"
    then:
      function: pattern
      functionOptions:
        match: "^[a-z][a-zA-Z0-9]*$"

  operation-operationId-verb-prefix:
    description: >-
      operationId should begin with an approved verb prefix (get, list, create,
      update, delete, launch, search).
    message: 'operationId "{{value}}" should start with get/list/create/update/delete/launch/search.'
    severity: warn
    given: "$.paths[*][get,post,put,patch,delete,head,options].operationId"
    then:
      function: pattern
      functionOptions:
        match: "^(get|list|create|update|delete|launch|search)[A-Z]"

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

  operation-tag-count:
    description: Operation tags array must not be empty.
    message: "Operation tags array must not be empty."
    severity: error
    given: "$.paths[*][get,post,put,patch,delete,head,options].tags"
    then:
      function: length
      functionOptions:
        min: 1

  # ===========================================================================
  # TAGS
  # ===========================================================================

  tags-defined-globally:
    description: A top-level tags array must be defined.
    message: "Global tags array must be defined."
    severity: error
    given: "$"
    then:
      field: tags
      function: truthy

  tags-name-required:
    description: Every tag must have a name.
    message: "tag.name is required."
    severity: error
    given: "$.tags[*]"
    then:
      field: name
      function: truthy

  tags-description-required:
    description: Every tag must have a description.
    message: "tag.description is required."
    severity: warn
    given: "$.tags[*]"
    then:
      field: description
      function: truthy

  tags-title-case:
    description: >-
      Tag names should use Title Case (e.g. "Integration Assemblies",
      "Human Resources", "Benefits Administration").
    message: 'Tag name "{{value}}" should use Title Case.'
    severity: warn
    given: "$.tags[*].name"
    then:
      function: pattern
      functionOptions:
        match: "^[A-Z][A-Za-z]*( [A-Z][A-Za-z]*)*$"

  operation-tags-must-be-defined-globally:
    description: Every tag referenced on an operation must be defined in the global tags array.
    message: 'Operation tag "{{value}}" is not declared in the top-level tags array.'
    severity: warn
    given: "$.paths[*][get,post,put,patch,delete,head,options].tags[*]"
    then:
      function: enumeration
      functionOptions:
        values:
          - Integration Assemblies
          - Integration Events
          - Integration Systems
          - Integration Templates
          - Launch Parameters
          - Absence Management
          - Benefits Administration
          - Compensation
          - Financial Management
          - Human Resources
          - Payroll
          - Recruiting
          - Service Directory
          - Staffing
          - Time Tracking

  # ===========================================================================
  # PARAMETERS
  # ===========================================================================

  parameter-description-required:
    description: Every parameter must have a description.
    message: "Parameter description is required."
    severity: warn
    given: "$..parameters[*]"
    then:
      field: description
      function: truthy

  parameter-name-camelcase:
    description: >-
      Parameter names should use camelCase. The path identifier "ID" is
      permitted as the canonical Workday resource identifier.
    message: 'Parameter name "{{value}}" should be camelCase.'
    severity: warn
    given: "$..parameters[*].name"
    then:
      function: pattern
      functionOptions:
        match: "^([a-z][a-zA-Z0-9]*|ID)$"

  parameter-no-apikey-in-query:
    description: API keys must not be passed as query parameters.
    message: 'Parameter "{{value}}" looks like an API key in the query string — use a header.'
    severity: error
    given: "$..parameters[?(@.in == 'query')].name"
    then:
      function: pattern
      functionOptions:
        notMatch: "(?i)^(api[-_]?key|access[-_]?token|auth[-_]?token)$"

  parameter-pagination-uses-limit-offset:
    description: >-
      Standardize pagination on limit/offset. The web services spec uses
      pageSize/page; new operations should adopt limit/offset.
    message: 'Pagination parameter "{{value}}" should be "limit" or "offset" — pageSize/page is discouraged.'
    severity: warn
    given: "$..parameters[?(@.in == 'query')].name"
    then:
      function: pattern
      functionOptions:
        notMatch: "^(pageSize|page|page_size|page_number|per_page)$"

  # ===========================================================================
  # REQUEST BODIES
  # ===========================================================================

  request-body-json-content:
    description: Request bodies must support application/json.
    message: "Request body must declare application/json content."
    severity: error
    given: "$.paths[*][post,put,patch].requestBody.content"
    then:
      field: application/json
      function: truthy

  request-body-description-recommended:
    description: Request bodies should include a description.
    message: "Request body should have a description."
    severity: info
    given: "$.paths[*][post,put,patch].requestBody"
    then:
      field: description
      function: truthy

  # ===========================================================================
  # RESPONSES
  # ===========================================================================

  response-success-required:
    description: Every operation must define at least one 2xx response.
    message: "Operation must define a 2xx success response."
    severity: error
    given: "$.paths[*][get,post,put,patch,delete,head,options].responses"
    then:
      function: schema
      functionOptions:
        schema:
          type: object
          patternProperties:
            "^2[0-9][0-9]$":
              type: object
          anyOf:
            - required: ["200"]
            - required: ["201"]
            - required: ["202"]
            - required: ["204"]

  response-401-required:
    description: Operations should declare a 401 response since the API requires authentication.
    message: "Operation should declare a 401 Unauthorized response."
    severity: warn
    given: "$.paths[*][get,post,put,patch,delete,head,options].responses"
    then:
      field: "401"
      function: truthy

  response-403-recommended:
    description: Operations should declare a 403 response for permission errors.
    message: "Operation should declare a 403 Forbidden response."
    severity: warn
    given: "$.paths[*][get,post,put,patch,delete,head,options].responses"
    then:
      field: "403"
      function: truthy

  response-404-on-id-paths:
    description: Operations on /{ID} paths should declare a 404 response.
    message: "Operation on a templated path should declare a 404 response."
    severity: warn
    given: "$.paths[?(@property.match(/\\{[A-Za-z]+\\}/))][get,post,put,patch,delete].responses"
    then:
      field: "404"
      function: truthy

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

  response-2xx-json-content:
    description: 2xx responses must return application/json.
    message: "2xx response must declare application/json content."
    severity: warn
    given: "$.paths[*][get,post,put,patch,delete,head,options].responses[?(@property.match(/^2[0-9][0-9]$/))].content"
    then:
      field: application/json
      function: truthy

  response-error-schema-has-message:
    description: The shared ErrorResponse schema should expose a message-bearing field.
    message: "ErrorResponse should expose at least one of: error, message, errors."
    severity: warn
    given: "$.components.schemas.ErrorResponse.properties"
    then:
      function: schema
      functionOptions:
        schema:
          anyOf:
            - required: ["error"]
            - required: ["message"]
            - required: ["errors"]

  response-list-uses-total-data-wrapper:
    description: >-
      Collection responses should use the standard {total, data[]} wrapper
      shape used throughout the Workday Studio specs.
    message: "Collection response schema should expose 'total' and 'data' properties."
    severity: warn
    given: "$.components.schemas[?(@property.match(/Response$/))].properties"
    then:
      function: schema
      functionOptions:
        schema:
          allOf:
            - required: ["data"]

  # ===========================================================================
  # SCHEMAS — PROPERTY NAMING
  # ===========================================================================

  schema-property-name-camelcase:
    description: >-
      Schema property names should use camelCase. The canonical "ID" path
      identifier is permitted at any depth.
    message: 'Property name "{{property}}" should be camelCase.'
    severity: warn
    given: "$.components.schemas..properties"
    then:
      field: "@key"
      function: pattern
      functionOptions:
        match: "^([a-z][a-zA-Z0-9]*|ID)$"

  schema-id-property-name:
    description: >-
      Resource identifier properties should be named "id" (lowercase), matching
      the convention used across the Workday Studio specs.
    message: 'Use "id" rather than "{{property}}" for resource identifiers.'
    severity: warn
    given: "$.components.schemas..properties"
    then:
      field: "@key"
      function: pattern
      functionOptions:
        notMatch: "^(Id|ID|_id|identifier)$"

  schema-timestamp-property-suffix:
    description: >-
      Date-time properties should be named with a "DateTime" suffix
      (e.g. startDateTime, endDateTime, lastRunDateTime).
    message: 'date-time property "{{property}}" should end with "DateTime".'
    severity: info
    given: "$.components.schemas..properties[?(@.format == 'date-time')]~"
    then:
      function: pattern
      functionOptions:
        match: "DateTime$"

  schema-date-property-suffix:
    description: >-
      Date-only properties should be named with a "Date" suffix
      (e.g. hireDate, startDate, effectiveDate).
    message: 'date property "{{property}}" should end with "Date".'
    severity: info
    given: "$.components.schemas..properties[?(@.format == 'date')]~"
    then:
      function: pattern
      functionOptions:
        match: "Date$"

  schema-top-level-description:
    description: Top-level schemas in components should include a description.
    message: 'Schema "{{property}}" should include a description.'
    severity: info
    given: "$.components.schemas[*]"
    then:
      field: description
      function: truthy

  schema-type-required:
    description: Every schema definition should declare a type.
    message: "Schema should declare a type."
    severity: warn
    given: "$.components.schemas[*]"
    then:
      field: type
      function: truthy

  # ===========================================================================
  # SECURITY
  # ===========================================================================

  security-global-defined:
    description: A global security requirement must be defined.
    message: "Global security must be defined."
    severity: error
    given: "$"
    then:
      field: security
      function: truthy

  security-schemes-defined:
    description: components.securitySchemes must be defined.
    message: "components.securitySchemes must be defined."
    severity: error
    given: "$.components"
    then:
      field: securitySchemes
      function: truthy

  security-oauth2-required:
    description: Specs must define an OAuth2 security scheme named "OAuth2".
    message: 'A security scheme named "OAuth2" must be defined.'
    severity: error
    given: "$.components.securitySchemes"
    then:
      field: OAuth2
      function: truthy

  security-oauth2-flow-authorization-code:
    description: The OAuth2 scheme must declare an authorizationCode flow.
    message: "OAuth2 must declare an authorizationCode flow."
    severity: warn
    given: "$.components.securitySchemes.OAuth2.flows"
    then:
      field: authorizationCode
      function: truthy

  security-oauth2-token-url-tenant:
    description: OAuth2 tokenUrl should template the tenant in the path.
    message: 'OAuth2 tokenUrl should include "{tenant}" (got "{{value}}").'
    severity: info
    given: "$.components.securitySchemes.OAuth2.flows.authorizationCode.tokenUrl"
    then:
      function: pattern
      functionOptions:
        match: "\\{tenant\\}"

  security-scope-naming:
    description: >-
      OAuth2 scope names should use the Workday Studio convention of
      "<r|w>:<resource>" (e.g. r:integrations, w:integrations, r:wws, w:wws).
    message: 'Scope "{{property}}" should match "<r|w>:<resource>".'
    severity: warn
    given: "$.components.securitySchemes.OAuth2.flows.authorizationCode.scopes"
    then:
      field: "@key"
      function: pattern
      functionOptions:
        match: "^[rw]:[a-z][a-z0-9_]*$"

  # ===========================================================================
  # HTTP METHOD CONVENTIONS
  # ===========================================================================

  no-request-body-on-get:
    description: GET operations must not declare a request body.
    message: "GET operations must not have a requestBody."
    severity: error
    given: "$.paths[*].get"
    then:
      field: requestBody
      function: falsy

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

  put-patch-request-body-required:
    description: PUT and PATCH operations must declare a request body.
    message: "PUT/PATCH operations should declare a requestBody."
    severity: warn
    given: "$.paths[*][put,patch]"
    then:
      field: requestBody
      function: truthy

  # ===========================================================================
  # GENERAL QUALITY
  # ===========================================================================

  no-empty-descriptions:
    description: Description fields, when present, must not be empty strings.
    message: "Empty description is not allowed."
    severity: error
    given: "$..description"
    then:
      function: truthy

  external-docs-encouraged:
    description: A top-level externalDocs object is encouraged for discoverability.
    message: "Consider adding a top-level externalDocs entry."
    severity: info
    given: "$"
    then:
      field: externalDocs
      function: truthy

  examples-encouraged:
    description: Adding examples to schemas helps consumers understand payloads.
    message: 'Schema "{{property}}" has no example or examples — consider adding one.'
    severity: info
    given: "$.components.schemas[*]"
    then:
      function: schema
      functionOptions:
        schema:
          anyOf:
            - required: ["example"]
            - required: ["examples"]

  deprecation-must-be-documented:
    description: Deprecated operations must explain the deprecation in their description.
    message: 'Deprecated operation should mention "deprecat" in its description.'
    severity: warn
    given: "$.paths[*][get,post,put,patch,delete,head,options][?(@.deprecated == true)].description"
    then:
      function: pattern
      functionOptions:
        match: "(?i)deprecat"