require "log4r"
#require "lockfile"

module VagrantPlugins
  module ProviderVirtualBox
    module Action
      class ImportMaster
        def initialize(app, env)
          @app = app
          @logger = Log4r::Logger.new("vagrant::action::vm::create_master")
        end

        def call(env)
          master_id_file = env[:machine].box.directory.join("master_id")
                    
          env[:master_id] = master_id_file.read.chomp if master_id_file.file?          
          if env[:master_id] && env[:machine].provider.driver.vm_exists?(env[:master_id])
            # Master VM already exists -> nothing to do - continue.
            @app.call(env) 
          end          
          
          env[:ui].info I18n.t("vagrant.actions.vm.clone.importing", name: env[:machine].box.name)
            
          #TODO - prevent concurrent creation of master vms for the same box.
           
          # Import the virtual machine
          ovf_file = env[:machine].box.directory.join("box.ovf").to_s
          env[:master_id] = env[:machine].provider.driver.import(ovf_file) do |progress|
            env[:ui].clear_line
            env[:ui].report_progress(progress, 100, false)
          end
  
          # Clear the line one last time since the progress meter doesn't disappear immediately.
          env[:ui].clear_line

          # Flag as erroneous and return if import failed
          raise Vagrant::Errors::VMImportFailure if !env[:master_id]
        
          @logger.info("Imported box #{env[:machine].box.name} as master vm with id #{env[:master_id]}")
          
          @logger.info("Creating base snapshot for master VM.")
          env[:machine].provider.driver.create_snapshot(env[:master_id], "base")do |progress|
            env[:ui].clear_line
            env[:ui].report_progress(progress, 100, false)
          end

          @logger.debug("Writing id of master VM '#{env[:master_id]}' to #{master_id_file}")
          master_id_file.open("w+") do |f|
            f.write(env[:master_id])
          end
          
          # If we got interrupted, then the import could have been
          # interrupted and its not a big deal. Just return out.
          return if env[:interrupted]

          # Import completed successfully. Continue the chain
          @app.call(env)
        end
      end
    end
  end
end