# frozen_string_literal: true

module Diffend
  module Config
    # Class used to figure out the file from which we should load the settings
    module FileFinder
      # Names of the files or paths where we will look for the settings
      #
      # @note We do the double dot trick, to look outside of the current dir because when
      #   executed from a docker container, we copy the local uncommitted settings into the
      #   dir above the app location not to pollute the reset state of the git repo
      #
      # @note Order is important, as for local env we should load from
      #   local file (if present first)
      FILE_NAMES = %w[
        .diffend.yml
      ].map { |name| ["../#{name}", name] }.tap(&:flatten!).freeze

      private_constant :FILE_NAMES

      class << self
        # Looks for Diffend settings file for a given env
        #
        # @param build_path [String] path of the current build
        #
        # @return [String] path to the file from which we should load all the settings
        def call(build_path)
          FILE_NAMES
            .map { |name| File.join(build_path, name) }
            .map { |name| Dir[name] }
            .find { |selection| !selection.empty? }
            .tap { |path| path || raise(Errors::MissingConfigurationFile) }
            .first
        end
      end
    end
  end
end