module Eco
  module API
    class Session
      class Task < API::Common::Session::BaseSession
        NEWEST_FILE_MODE = [:newest, :last_file, :previous]
        LOAD_FILE_MODE   = [:file]
        SAVE_FILE_MODE   = [:save]
        API_MODE         = [:api, :api_get]

        def file_people(filename = enviro.config.people.cache)
          logger.info("Going to get all the people via API")
          people = session.batch.get_people
          file = file_manager.save_json(people, filename, :timestamp)
          logger.info("#{people.length} people loaded and saved locally to #{file}.")
          Eco::API::Organization::People.new(people)
        end

        def load_people(filename = enviro.config.people.cache, modifier: [:newest, :api])
          modifier = [modifier].flatten
          people = []
          case
          when !!filename && (load_file?(modifier) || newest_file?(modifier))
            case
            when newest_file?(modifier)
              # search input file based on pattern (in case the name has a timestamp)
              file = file_manager.dir.newest_file(file: filename)
              logger.info("previous file found: #{file}") if !!file
            else
              file = file_manager.dir.file(filename)
            end

            if !file
              logger.error("could not find the file #{file_manager.dir.file(filename)}")
              exit if !use_api?(modifier)
              people = self.load_people(modifier: modifier - NEWEST_FILE_MODE - LOAD_FILE_MODE)
            else
              people = file_manager.load_json(file)
              if !!people && people.is_a?(Array)
                logger.info("#{people&.length} people loaded from file #{file}")
              end
            end
          when use_api?(modifier)
            # no previous file: use API to get all people
            logger.info("Going to get all the people via API")
            people = session.batch.get_people

            if save_file?(modifier) && people && people.length > 0
              file = file_manager.save_json(people, filename, :timestamp)
              logger.info("#{people.length } people saved to file #{file}.")
            end
          end
          Eco::API::Organization::People.new(people)
        end

        private

        # MODIFIERS
        def use_api?(modifier)
          modifiers = [modifier].flatten
          modifiers.any? { |m| API_MODE.include?(m) }
        end

        def load_file?(modifier)
          modifiers = [modifier].flatten
          modifiers.any? { |m| LOAD_FILE_MODE.include?(m) }
        end

        def newest_file?(modifier)
          modifiers = [modifier].flatten
          modifiers.any? { |m| NEWEST_FILE_MODE.include?(m) }
        end

        def save_file?(modifier)
          modifiers = [modifier].flatten
          modifiers.any? { |m| SAVE_FILE_MODE.include?(m) }
        end

      end
    end
  end
end