class EcoRake
  module Lib
    module Files
      class Purge < EcoRake::Lib::BaseTask
        options_with_defaults true

        option '-e', '--enviro ENVIRO', String, desc: 'Target environment to run against (i.e. org, live)', required: true
        option '-d', '--folder NAME', desc: 'Source local folder'
        option '-l', '--list', TrueClass, desc: 'Lists files that will be deleted'
        option '-o', '--older-than [DAYS]', Integer, desc: 'Number of days files to archive should be older than'
        option '-r', '--remove', TrueClass, desc: "It deletes those files"

        def task(*_args)
          if target_files.empty?
            puts "There were no files in folder '#{source_folder}' to be #{str_op}"
          elsif options[:list]
            msg  = "#{target_files.count} target log files (from '#{source_folder}') will be #{str_op}"
            msg << " to '#{dest_folder}':" unless remove?
            puts msg
            target_files.each {|file| puts "  • #{File.basename(file)}"}
          elsif options[:remove]
            delete_file(*target_files, message: "Removing the following #{target_files.count} files from '#{source_folder}':")
          else
            ensure_dest_folder!
            msg = "Moving #{target_files.count} log files from '#{source_folder}' to the '#{dest_folder}' folder:"
            move_file(*target_files, folder: dest_folder, message: msg)
          end
        end

        private

        # Based on `older-than` option
        # @return [Array<String>]
        def target_files
          @target_files ||= folder_files(source_folder, older_than: older_than)
        end

        # Folder where the files will be moved (when applicable)
        def dest_folder
          @dest_folder ||= File.join(source_folder, 'archive').tap do |folder|
            directory folder
          end
        end

        #  It declares the folder as a task and creates it if it doesn't exist
        def ensure_dest_folder!
          directory dest_folder
          Rake::Task[dest_folder].invoke
        end

        # @return [String]
        def source_folder
          @source_folder ||= File.expand_path(options[:folder])
        end

        # @return [Integer] number of days the files are older than.
        def older_than
          options[:older_than] || (remove?? 15 : 3)
        end

        # @return [String]
        def str_op
          remove?? 'deleted' : 'moved'
        end

        # @return [Boolean] whether the files should be moved or removed/deleted.
        def remove?
          options[:remove]
        end
      end
    end
  end
end