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

require 'contrast/config/diagnostics/effective_config_value'
require 'contrast/config/diagnostics/tools'
require 'contrast/utils/object_share'

module Contrast
  module Config
    module Diagnostics
      # Reads All ENV variables.
      module EnvironmentVariables
        class << self
          NON_COMMON_ENV = %w[
            CONTRAST_CONFIG_PATH CONTRAST_AGENT_TELEMETRY_OPTOUT CONTRAST_AGENT_TELEMETRY_TEST
          ].cs__freeze

          # This method will fill the canonical name for each env var and will check for any uncommon ones.
          #
          # @param env [Hash]
          # @return [Array] array of all the values needed to be written.
          def environment_settings env
            env_hash = env.select do |e|
              e.to_s.start_with?(Contrast::Configuration::CONTRAST_ENV_MARKER) || NON_COMMON_ENV.include?(e.to_s)
            end
            environment_settings = []
            env_hash.each do |key, value|
              efc_value = Contrast::Config::Diagnostics::EffectiveConfigValue.new.tap do |effective_value|
                next unless value

                effective_value.canonical_name = if NON_COMMON_ENV.include?(key)
                                                   key.gsub(Contrast::Utils::ObjectShare::UNDERSCORE,
                                                            Contrast::Utils::ObjectShare::PERIOD).downcase
                                                 else
                                                   key.gsub(Contrast::Utils::ObjectShare::DOUBLE_UNDERSCORE,
                                                            Contrast::Utils::ObjectShare::PERIOD).downcase
                                                 end
                if effective_value.canonical_name
                  effective_value.key =
                    effective_value.canonical_name.gsub(Contrast::Utils::ObjectShare::CONTRAST_DOT,
                                                        Contrast::Utils::ObjectShare::EMPTY_STRING)
                end
                effective_value.value = Contrast::Config::Diagnostics::Tools.value_to_s(value)
                effective_value.key = key
              end
              environment_settings << efc_value if efc_value
            end
            environment_settings
          end
        end
      end
    end
  end
end