extends:
  - spectral:oas

rules:
  # Backpack uses lowerCamelCase parameter names (e.g. symbol, orderType, marketType, postOnly)
  backpack-parameter-camelcase:
    description: Backpack request and response field names use lowerCamelCase.
    message: '"{{property}}" should be lowerCamelCase to match Backpack convention.'
    severity: warn
    given: $.paths..parameters[?(@.in == 'query')].name
    then:
      function: pattern
      functionOptions:
        match: "^[a-z][a-zA-Z0-9]*$"

  # All trader-facing paths live under /api/v1/ or /wapi/v1/
  backpack-path-prefix:
    description: Backpack exposes the trading API under /api/v1/ and the wallet/history API under /wapi/v1/.
    message: Path "{{path}}" should start with /api/v1/ or /wapi/v1/.
    severity: warn
    given: $.paths
    then:
      field: "@key"
      function: pattern
      functionOptions:
        match: "^/(api|wapi)/v1/"

  # All authenticated operations should document the four signing headers.
  backpack-signed-request-headers:
    description: Authenticated operations require X-API-Key, X-Signature, X-Timestamp, and X-Window headers.
    message: Authenticated operation is missing the documented signing headers.
    severity: warn
    given: $.paths.*[?( @.security && @.security.length > 0 )]
    then:
      field: parameters
      function: truthy

  # Operations should bind to a named instruction (orderExecute, balanceQuery, etc.)
  backpack-instruction-binding:
    description: Authenticated operations should document the Backpack signing instruction.
    message: Operation is missing the `x-backpack-instruction` extension naming the signing instruction.
    severity: info
    given: $.paths.*[?( @.security && @.security.length > 0 )]
    then:
      field: x-backpack-instruction
      function: truthy

  # Title Case operation summaries
  backpack-summary-titlecase:
    description: Operation summaries should be Title Case sentences ending in a period.
    severity: info
    given: $.paths.*.*.summary
    then:
      function: pattern
      functionOptions:
        match: "^[A-Z][^.]*\\.?$"

  # Pagination uses limit + offset
  backpack-pagination-limit-offset:
    description: List endpoints should expose `limit` (max 1000) and `offset` query parameters for pagination.
    severity: info
    given: $.paths[?(@property =~ /s$/)].get.parameters
    then:
      function: schema
      functionOptions:
        schema:
          type: array
          contains:
            type: object
            properties:
              name: {const: limit}