# Copyright (c) 2022 Contrast Security, Inc. See https://www.contrastsecurity.com/enduser-terms-0317a for more details.
# frozen_string_literal: true

require 'contrast/components/logger'

module Contrast
  module Agent
    module Reporting
      # This is the new FindingEventStack class which will include all the needed information for the new reporting
      # system to relay this information in the Finding/Trace messages. These FindingEventStack are used by TeamServer
      # to construct the vulnerability information for the assess feature. They represent the callstack at the time
      # that each FindingEvent was generated.
      class FindingEventStack
        include Contrast::Components::Logger::InstanceMethods

        # @return [String] unused
        attr_reader :eval
        # @return [String] the stack frame to show in TeamServer; the value of an entry in #caller
        attr_reader :file
        # @return [String] unused
        attr_reader :line_number
        # @return [String] unused
        attr_reader :method
        # @return [String] unused
        attr_reader :signature
        # @return [String] unused
        attr_reader :type

        AGENT_CLASS_MARKER = '/lib/contrast/'

        class << self
          # @param stack [String]
          # @return [Contrast::Agent::Reporting::FindingEventStack,nil]
          def convert stack
            return unless stack
            return if stack.include?(AGENT_CLASS_MARKER)

            report = new
            report.attach_data(stack)
            report
          end
        end

        # Parse the data from a Contrast::Agent::Assess::Tag to attach what is required for reporting to TeamServer to
        # this Contrast::Agent::Reporting::FindingEventTaintRange
        #
        # @param stack [String]
        def attach_data stack
          @file = stack
        end

        # Convert the instance variables on the class, and other information, into the identifiers required for
        # TeamServer to process the JSON form of this message.
        #
        # @return [Hash]
        # @raise [ArgumentError]
        def to_controlled_hash
          begin
            validate
          rescue ArgumentError => e
            logger.error('FindingEventStack validation failed with: ', e)
            return
          end

          {
              file: file
            # eval: eval, # This is unused by the Ruby agent
            # line_number: line_number, # This is unused by the Ruby agent
            # method: method, # This is unused by the Ruby agent
            # signature: signature, # This is unused by the Ruby agent
            # type: type  # This is unused by the Ruby agent
          }
        end

        def validate
          raise(ArgumentError, "#{ self } did not have a proper hash. Unable to continue.") unless file && !file.empty?
        end
      end
    end
  end
end