# Copyright (c) 2023 Contrast Security, Inc. See https://www.contrastsecurity.com/enduser-terms-0317a for more details.
# frozen_string_literal: true

require 'contrast/utils/metrics_hash'
require 'contrast/agent/telemetry/metric_event'
require 'contrast/agent/version'
require 'contrast/components/logger'

module Contrast
  module Agent
    module Telemetry
      # Event to report all gather information from the Input Analysis metrics.
      class InputAnalysisEvent < Contrast::Agent::Telemetry::MetricEvent
        include Contrast::Components::Logger::InstanceMethods
        NOT_APPLICABLE = 'n/a'

        attr_reader :fields

        # Override the name for any derived classes
        NAME = 'InputAnalysis event'
        # Override the path for any derived classes
        PATH = '/protect_input_analysis'

        # @param rule_id [String] the rule name.
        # @param rates [Contrast::Agent::Protect::Rule::InputClassification::Rates] base class for all rates.
        def initialize rule_id, rates
          super()
          @fields = MetricsHash.new(Integer)
          add_tags(rule_id, rates)
          generate_fields(rates)
        end

        # Returns the name of the event.
        #
        # @return [String]
        def name
          cs__class::NAME
        end

        # Returns the path to report the event.
        #
        # @return [String]
        def path
          cs__class::PATH
        end

        # Override the empty check for any derived classes if needed.
        def empty?
          super && Contrast::Utils::DuckUtils.empty_duck?(@tags)
        end

        private

        # Creates the tags for the event. Overrides the base class to add the rule_id and match_rate.
        #
        # @param rule_id [String, nil]
        # @param rates [Contrast::Agent::Protect::Rule::InputClassification::Rates]
        def add_tags rule_id, rates
          return if Contrast::Utils::DuckUtils.empty_duck?(rates)
          return unless rates.cs__is_a?(Contrast::Agent::Protect::Rule::InputClassification::Rates)

          @tags['event_type'] = name # rubocop:disable Security/Module/Name
          @tags['test_environment'] = ENV['CONTRAST_AGENT_TELEMETRY_TEST'] == '1' ? 'true' : 'false'
          @tags['rule_id'] = rule_id if rule_id
          @tags['input_type'] = rates&.input_type.dup&.to_s || NOT_APPLICABLE
          add_system_tags
        end

        # Creates the fields for the event.
        # Override if needed.
        #
        # @param rates [Contrast::Agent::Protect::Rule::InputClassification::Rates] base class for all rates.
        def generate_fields rates
          return if Contrast::Utils::DuckUtils.empty_duck?(rates)
          return unless rates.cs__is_a?(Contrast::Agent::Protect::Rule::InputClassification::Rates)

          rates.to_fields.each { |field, value| @fields[field] = value.dup }
        end

        # Adds the system tags to the event.
        def add_system_tags
          @tags['agent_version'] = VERSION
          @tags['ruby_version'] = RUBY_VERSION
          @tags['os_type'] = sys_info['os_type'] == 'Darwin' ? 'MacOS' : 'Linux'
          @tags['os_arch'] = sys_info['os_arch']
          @tags['os_version'] = sys_info['os_version']
        end
      end
    end
  end
end