# =============================================================================
# YouTube API Spectral Ruleset
# Generated from analysis of YouTube Data API, Analytics API,
# Live Streaming API, and Reporting API OpenAPI specifications
# =============================================================================

rules:

  # ---------------------------------------------------------------------------
  # INFO / METADATA
  # ---------------------------------------------------------------------------

  info-title-required:
    description: Info title must be present and non-empty
    severity: error
    given: $.info
    then:
      field: title
      function: truthy

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

  info-description-required:
    description: Info description must be present
    severity: error
    given: $.info
    then:
      field: description
      function: truthy

  info-description-min-length:
    description: Info description should be at least 50 characters
    severity: warn
    given: $.info.description
    then:
      function: length
      functionOptions:
        min: 50

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

  info-contact-required:
    description: Contact information should be provided
    severity: warn
    given: $.info
    then:
      field: contact
      function: truthy

  info-terms-of-service:
    description: Terms of service URL should be provided
    severity: info
    given: $.info
    then:
      field: termsOfService
      function: truthy

  # ---------------------------------------------------------------------------
  # OPENAPI VERSION
  # ---------------------------------------------------------------------------

  openapi-version:
    description: OpenAPI version should be 3.0.x or 3.1.x
    severity: error
    given: $
    then:
      field: openapi
      function: pattern
      functionOptions:
        match: ^3\.[01]\.\d+$

  # ---------------------------------------------------------------------------
  # SERVERS
  # ---------------------------------------------------------------------------

  servers-defined:
    description: At least one server 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 should have a description
    severity: warn
    given: $.servers[*]
    then:
      field: description
      function: truthy

  servers-googleapis-domain:
    description: Server URLs should use googleapis.com domain
    severity: info
    given: $.servers[*].url
    then:
      function: pattern
      functionOptions:
        match: googleapis\.com

  # ---------------------------------------------------------------------------
  # PATHS — NAMING CONVENTIONS
  # ---------------------------------------------------------------------------

  paths-no-trailing-slash:
    description: Paths must not have trailing slashes
    severity: error
    given: $.paths
    then:
      field: "@key"
      function: pattern
      functionOptions:
        notMatch: .+\/$

  paths-no-query-strings:
    description: Paths must not include query strings
    severity: error
    given: $.paths
    then:
      field: "@key"
      function: pattern
      functionOptions:
        notMatch: \?

  paths-camel-case:
    description: YouTube paths use camelCase for resource names
    severity: warn
    given: $.paths
    then:
      field: "@key"
      function: pattern
      functionOptions:
        match: ^(/[a-z][a-zA-Z0-9]*(\/{[a-zA-Z]+})?)+$

  paths-plural-resources:
    description: Resource paths should use plural nouns
    severity: info
    given: $.paths
    then:
      field: "@key"
      function: pattern
      functionOptions:
        match: ^(/[a-z][a-zA-Z]*s|/[a-z][a-zA-Z]*s/|/[a-z][a-zA-Z]*(Items|Types|Reasons|Languages|Regions|Banners|Sections|Levels|Events))

  # ---------------------------------------------------------------------------
  # OPERATIONS
  # ---------------------------------------------------------------------------

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

  operation-operationid-format:
    description: OperationId should follow youtube.resource.action or youtubeAnalytics.resource.action format
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].operationId
    then:
      function: pattern
      functionOptions:
        match: ^(youtube|youtubeAnalytics|youtubeReporting)\.[a-zA-Z]+\.[a-zA-Z]+$

  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 "Youtube" prefix
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].summary
    then:
      function: pattern
      functionOptions:
        match: ^Youtube

  operation-summary-title-case:
    description: Operation summaries should use Title Case
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].summary
    then:
      function: pattern
      functionOptions:
        match: "^[A-Z][a-zA-Z]+(\\s[A-Za-z]+)*$"

  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-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

  operation-single-tag:
    description: Operations should have exactly one tag
    severity: info
    given: $.paths[*][get,post,put,patch,delete].tags
    then:
      function: length
      functionOptions:
        max: 1

  # ---------------------------------------------------------------------------
  # TAGS
  # ---------------------------------------------------------------------------

  tags-defined:
    description: Global tags array should be defined
    severity: warn
    given: $
    then:
      field: tags
      function: truthy

  tags-description:
    description: Each tag should have a description
    severity: warn
    given: $.tags[*]
    then:
      field: description
      function: truthy

  tags-pascal-case:
    description: Tag names should use PascalCase (YouTube convention)
    severity: warn
    given: $.tags[*].name
    then:
      function: pattern
      functionOptions:
        match: ^[A-Z][a-zA-Z0-9]+$

  # ---------------------------------------------------------------------------
  # PARAMETERS
  # ---------------------------------------------------------------------------

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

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

  parameter-camel-case:
    description: Parameter names should use camelCase (YouTube convention)
    severity: warn
    given: $.paths[*][get,post,put,patch,delete].parameters[*].name
    then:
      function: pattern
      functionOptions:
        match: ^[a-z][a-zA-Z0-9]*$

  parameter-example:
    description: Parameters should have example values
    severity: info
    given: $.paths[*][get,post,put,patch,delete].parameters[*]
    then:
      field: example
      function: truthy

  parameter-pagination-naming:
    description: Pagination should use pageToken and maxResults (YouTube convention)
    severity: info
    given: $.paths[*][get,post,put,patch,delete].parameters[?(@.name=='page' || @.name=='offset' || @.name=='cursor')]
    then:
      field: name
      function: pattern
      functionOptions:
        match: ^(pageToken|maxResults|pageSize)$

  # ---------------------------------------------------------------------------
  # REQUEST BODIES
  # ---------------------------------------------------------------------------

  request-body-json:
    description: Request bodies should use application/json content type
    severity: warn
    given: $.paths[*][post,put,patch].requestBody.content
    then:
      field: application/json
      function: truthy

  # ---------------------------------------------------------------------------
  # RESPONSES
  # ---------------------------------------------------------------------------

  response-success-required:
    description: Every operation must have a 2xx 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-description-required:
    description: Every response must have a description
    severity: error
    given: $.paths[*][get,post,put,patch,delete].responses[*]
    then:
      field: description
      function: truthy

  response-json-content:
    description: Success responses should use application/json
    severity: warn
    given: $.paths[*][get,post,put,patch].responses[?(@property >= 200 && @property < 300)].content
    then:
      field: application/json
      function: truthy

  response-examples:
    description: Responses should include named examples for Microcks compatibility
    severity: info
    given: $.paths[*][get,post,put,patch,delete].responses[*].content.application/json
    then:
      field: examples
      function: truthy

  # ---------------------------------------------------------------------------
  # SCHEMAS — PROPERTY NAMING
  # ---------------------------------------------------------------------------

  schema-description:
    description: Top-level schemas should have descriptions
    severity: warn
    given: $.components.schemas[*]
    then:
      field: description
      function: truthy

  schema-type-required:
    description: Schema properties must define a type
    severity: error
    given: $.components.schemas[*].properties[*]
    then:
      function: schema
      functionOptions:
        schema:
          anyOf:
            - required: ["type"]
            - required: ["$ref"]
            - required: ["allOf"]
            - required: ["oneOf"]
            - required: ["anyOf"]

  schema-property-camel-case:
    description: Schema property names should use camelCase (YouTube convention)
    severity: warn
    given: $.components.schemas[*].properties
    then:
      field: "@key"
      function: pattern
      functionOptions:
        match: ^[a-z][a-zA-Z0-9]*$

  schema-kind-property:
    description: YouTube resource schemas should include a kind property
    severity: info
    given: $.components.schemas[?(@.properties.etag)].properties
    then:
      field: kind
      function: truthy

  schema-etag-property:
    description: YouTube resource schemas should include an etag property
    severity: info
    given: $.components.schemas[?(@.properties.kind)].properties
    then:
      field: etag
      function: truthy

  schema-property-example:
    description: Schema properties should have example values
    severity: info
    given: $.components.schemas[*].properties[*]
    then:
      function: schema
      functionOptions:
        schema:
          anyOf:
            - required: ["example"]
            - required: ["$ref"]
            - required: ["enum"]

  # ---------------------------------------------------------------------------
  # SECURITY
  # ---------------------------------------------------------------------------

  security-global-defined:
    description: Global security must be defined
    severity: error
    given: $
    then:
      field: security
      function: truthy

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

  security-oauth2-scheme:
    description: YouTube APIs should use OAuth 2.0 authentication
    severity: warn
    given: $.components.securitySchemes
    then:
      field: oauth2
      function: truthy

  security-api-key-scheme:
    description: YouTube APIs should support API key authentication for read operations
    severity: info
    given: $.components.securitySchemes
    then:
      field: apiKey
      function: truthy

  # ---------------------------------------------------------------------------
  # HTTP METHOD CONVENTIONS
  # ---------------------------------------------------------------------------

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

  http-delete-no-body:
    description: DELETE operations must not have a request body
    severity: error
    given: $.paths[*].delete
    then:
      field: requestBody
      function: falsy

  http-post-has-body:
    description: POST operations should have a request body
    severity: warn
    given: $.paths[*].post
    then:
      field: requestBody
      function: truthy

  http-put-has-body:
    description: PUT operations should have a request body
    severity: warn
    given: $.paths[*].put
    then:
      field: requestBody
      function: truthy

  # ---------------------------------------------------------------------------
  # MICROCKS COMPATIBILITY
  # ---------------------------------------------------------------------------

  microcks-operation-extension:
    description: Operations should have x-microcks-operation for mock server compatibility
    severity: info
    given: $.paths[*][get,post,put,patch,delete]
    then:
      field: x-microcks-operation
      function: truthy

  # ---------------------------------------------------------------------------
  # GENERAL QUALITY
  # ---------------------------------------------------------------------------

  no-empty-descriptions:
    description: Descriptions must not be empty strings
    severity: error
    given: $..description
    then:
      function: truthy

  deprecated-documented:
    description: Deprecated operations should have a description explaining the deprecation
    severity: warn
    given: $.paths[*][get,post,put,patch,delete][?(@.deprecated==true)]
    then:
      field: description
      function: truthy

  list-response-items-array:
    description: List responses should contain an items array (YouTube convention)
    severity: info
    given: $.components.schemas[?(@.properties.nextPageToken)].properties
    then:
      field: items
      function: truthy