extends: spectral:oas
rules:
  shift4-operation-id-required:
    description: All Shift4 operations must have an operationId.
    message: "Operation at {{path}} is missing operationId"
    given: "$.paths[*][get,post,put,patch,delete]"
    severity: error
    then:
      field: operationId
      function: truthy

  shift4-operation-id-camel-case:
    description: Shift4 operationIds use camelCase (e.g., createCharge, listEvents).
    message: "operationId '{{value}}' should use camelCase"
    given: "$.paths[*][get,post,put,patch,delete].operationId"
    severity: warn
    then:
      function: pattern
      functionOptions:
        match: "^[a-z][a-zA-Z0-9]+$"

  shift4-tags-required:
    description: All Shift4 operations must declare at least one tag.
    message: "Operation '{{path}}' must include at least one tag"
    given: "$.paths[*][get,post,put,patch,delete]"
    severity: warn
    then:
      field: tags
      function: truthy

  shift4-summary-title-case:
    description: Operation summaries should use Title Case.
    message: "Summary '{{value}}' should use Title Case"
    given: "$.paths[*][get,post,put,patch,delete].summary"
    severity: hint
    then:
      function: pattern
      functionOptions:
        match: "^[A-Z]"

  shift4-no-versioned-paths:
    description: Shift4 paths are unversioned (no /v1/ prefix); the version lives in the secret key.
    message: "Path '{{property}}' must not include a version prefix"
    given: "$.paths[*]~"
    severity: warn
    then:
      function: pattern
      functionOptions:
        notMatch: "^/v[0-9]+/"

  shift4-no-trailing-slash:
    description: Shift4 paths must not have trailing slashes.
    message: "Path '{{property}}' must not end with a slash"
    given: "$.paths[*]~"
    severity: warn
    then:
      function: pattern
      functionOptions:
        notMatch: "/$"

  shift4-basic-auth-defined:
    description: Shift4 uses HTTP Basic auth with the secret key as username.
    message: "API must declare BasicAuth security scheme"
    given: "$.components.securitySchemes"
    severity: error
    then:
      field: BasicAuth
      function: truthy

  shift4-server-production:
    description: The Shift4 production server must be https://api.shift4.com.
    message: "Servers list should include https://api.shift4.com"
    given: "$.servers[*].url"
    severity: warn
    then:
      function: pattern
      functionOptions:
        match: "^https://api\\.shift4\\.com$"

  shift4-amount-integer:
    description: Amount fields must be integers expressed in the smallest currency unit.
    message: "amount field at '{{path}}' must be type integer"
    given: "$.components.schemas[*].properties.amount.type"
    severity: warn
    then:
      function: enumeration
      functionOptions:
        values:
          - integer

  shift4-currency-string:
    description: Currency must be a string (ISO 4217 code).
    message: "currency field at '{{path}}' must be type string"
    given: "$.components.schemas[*].properties.currency.type"
    severity: warn
    then:
      function: enumeration
      functionOptions:
        values:
          - string

  shift4-created-int64:
    description: Resource 'created' timestamps are Unix seconds (integer int64).
    message: "created field at '{{path}}' should be int64 integer"
    given: "$.components.schemas[*].properties.created"
    severity: hint
    then:
      function: schema
      functionOptions:
        schema:
          type: object
          properties:
            type: { const: integer }
            format: { const: int64 }

  shift4-response-200-defined:
    description: All Shift4 operations should define a 200 response.
    message: "Operation '{{path}}' should define a 200 success response"
    given: "$.paths[*][get,post,put,patch,delete].responses"
    severity: warn
    then:
      field: "200"
      function: truthy

  shift4-list-response-shape:
    description: List endpoints should use a list/hasMore/totalCount envelope.
    message: "List response schema at '{{path}}' should include list, hasMore, totalCount"
    given: "$.components.schemas[?(@property.match(/^ListResponse/))].properties"
    severity: hint
    then:
      function: schema
      functionOptions:
        schema:
          type: object
          required: [list, hasMore]

  shift4-info-contact:
    description: Shift4 OpenAPI specs must include contact info.
    message: "Info object must include contact details"
    given: "$.info"
    severity: warn
    then:
      field: contact
      function: truthy

  shift4-servers-defined:
    description: Shift4 API must define at least one server.
    message: "API must define at least one server"
    given: "$"
    severity: error
    then:
      field: servers
      function: truthy