# frozen_string_literal: true

module Wso2Toolbox
  module TokenManager
    module Adapters
      module LockFile
        FileLockedError = Class.new(StandardError)

        ATTEMPTS = 5
        TIME_INTERVAL = 1
        FILE_PATH = 'tmp/localstorage.json'

        def with_free_localstorage
          ATTEMPTS.times do |i|
            locked_file = lock_file do |localstorage|
              yield(localstorage)
            end

            raise FileLockedError if !locked_file && i == (ATTEMPTS - 1)

            !locked_file ? sleep(TIME_INTERVAL) : break
          end
        end

        def lock_file
          File.open(FILE_PATH, 'a+') do |file|
            lock_status = file.flock(File::LOCK_EX | File::LOCK_NB)

            if lock_status
              block_value = yield(file)

              file.flock(File::LOCK_UN)
              block_value
            end
          end
        end
      end
    end
  end
end