extends: spectral:oas
rules:
  # Science Museum Group Collection API Conventions

  # Enforce JSONAPI content type for all responses
  smg-jsonapi-content-type:
    description: Science Museum Group API responses must use the JSONAPI content type application/vnd.api+json
    message: Response content type must be application/vnd.api+json for JSONAPI compliance
    severity: warn
    given: $.paths.*.*.responses.*.content
    then:
      field: "@key"
      function: enumeration
      functionOptions:
        values:
          - application/vnd.api+json

  # Enforce pagination parameters on search endpoints
  smg-search-requires-pagination:
    description: All search endpoints must support page[number] and page[size] parameters
    message: Search endpoints should include pagination parameters (page[number], page[size])
    severity: warn
    given: $.paths[?(@property.startsWith('/search'))].get.parameters[*].name
    then:
      function: enumeration
      functionOptions:
        values:
          - q
          - random
          - page[number]
          - page[size]
          - date[from]
          - date[to]
          - places
          - images
          - type
          - makers
          - people
          - categories
          - museum
          - on_display
          - location
          - birth[place]
          - birth[date]
          - death[date]
          - occupation
          - archive

  # Enforce operation IDs follow camelCase convention
  smg-operation-id-camel-case:
    description: Operation IDs must use camelCase naming
    message: Operation ID {{value}} must use camelCase
    severity: warn
    given: $.paths.*.*.operationId
    then:
      function: pattern
      functionOptions:
        match: "^[a-z][a-zA-Z0-9]+$"

  # Enforce all paths use kebab-case
  smg-path-kebab-case:
    description: API paths must use kebab-case
    message: Path {{value}} must use kebab-case (lowercase letters and hyphens only)
    severity: warn
    given: $.paths[*]~
    then:
      function: pattern
      functionOptions:
        match: "^(\\/[a-z0-9-{}]+)+$"

  # Require description on all operations
  smg-operation-description-required:
    description: All API operations must have a description
    message: Operation at {{path}} is missing a description
    severity: warn
    given: $.paths.*.*
    then:
      field: description
      function: truthy

  # Require tags on all operations
  smg-operation-tags-required:
    description: All API operations must be tagged
    message: Operation at {{path}} is missing tags
    severity: warn
    given: $.paths.*.*
    then:
      field: tags
      function: truthy

  # Enforce path parameters are referenced in the path
  smg-path-params-used:
    description: Path parameters declared in parameters must appear in the path
    message: Parameter {{value}} declared as path parameter but not found in path
    severity: error
    given: $.paths.*.*.parameters[?(@.in == 'path')].name
    then:
      function: defined

  # Enforce 404 response for GET single resource endpoints
  smg-single-resource-has-404:
    description: Endpoints that retrieve a single resource by ID must define a 404 response
    message: Single-resource GET endpoint at {{path}} must include a 404 response
    severity: warn
    given: $.paths.*[?(@property == 'get')].responses
    then:
      field: "404"
      function: defined

  # Require OpenAPI version 3.x
  smg-openapi-version:
    description: APIs must use OpenAPI 3.x specification
    message: API spec must use OpenAPI version 3.x
    severity: error
    given: $.openapi
    then:
      function: pattern
      functionOptions:
        match: "^3\\."

  # Require server URL definition
  smg-servers-required:
    description: API specification must define at least one server URL
    message: API spec must include servers definition
    severity: error
    given: $
    then:
      field: servers
      function: truthy