module VagrantPlugins
  module DockerProvider
    module Action
      # Include the built-in modules so we can use them as top-level things.
      include Vagrant::Action::Builtin

      # This action brings the "machine" up from nothing, including creating the
      # container, configuring metadata, and booting.
      def self.action_up
        Vagrant::Action::Builder.new.tap do |b|
          b.use ConfigValidate
          b.use HandleBox

          b.use Call, IsState, :host_state_unknown do |env, b2|
            if env[:result]
              b2.use HostMachine
            end
          end

          b.use Call, IsState, :not_created do |env, b2|
            # If the VM is NOT created yet, then do the setup steps
            if env[:result]
              b2.use EnvSet, :port_collision_repair => true
              b2.use HandleForwardedPortCollisions

              b2.use Call, HasSSH do |env2, b3|
                if env2[:result]
                  b3.use Provision
                else
                  b3.use Message,
                    I18n.t("docker_provider.messages.provision_no_ssh"),
                    post: true
                end
              end

              b2.use PrepareNFSValidIds
              b2.use SyncedFolderCleanup
              b2.use SyncedFolders
              b2.use PrepareNFSSettings
              b2.use ForwardPorts
              # This will actually create and start, but that's fine
              b2.use Create
              b2.use action_boot
            else
              b2.use PrepareNFSValidIds
              b2.use SyncedFolderCleanup
              b2.use SyncedFolders
              b2.use PrepareNFSSettings
              b2.use action_start
            end
          end
        end
      end

      # This action just runs the provisioners on the machine.
      def self.action_provision
        Vagrant::Action::Builder.new.tap do |b|
          b.use ConfigValidate
          b.use Call, IsState, :not_created do |env, b2|
            if env[:result]
              b2.use Message, I18n.t("docker_provider.messages.not_created")
              next
            end

            b2.use Call, IsState, :running do |env2, b3|
              if !env2[:result]
                b3.use Message, I18n.t("docker_provider.messages.not_running")
                next
              end

              b3.use Provision
            end
          end
        end
      end

      # This is the action that is primarily responsible for halting
      # the virtual machine, gracefully or by force.
      def self.action_halt
        Vagrant::Action::Builder.new.tap do |b|
          b.use Call, IsState, :host_state_unknown do |env, b2|
            if env[:result]
              b2.use HostMachine
            end
          end

          b.use Call, IsState, :not_created do |env, b2|
            if env[:result]
              b2.use Message, I18n.t("docker_provider.messages.not_created")
              next
            end

            b2.use Call, GracefulHalt, :stopped, :running do |env2, b3|
              if !env2[:result]
                b3.use Stop
              end
            end
          end
        end
      end

      # This action is responsible for reloading the machine, which
      # brings it down, sucks in new configuration, and brings the
      # machine back up with the new configuration.
      def self.action_reload
        Vagrant::Action::Builder.new.tap do |b|
          b.use Call, IsState, :not_created do |env, b2|
            if env[:result]
              b2.use Message, I18n.t("docker_provider.messages.not_created")
              next
            end

            b2.use ConfigValidate
            b2.use action_halt
            b2.use action_start
          end
        end
      end

      # This is the action that is primarily responsible for completely
      # freeing the resources of the underlying virtual machine.
      def self.action_destroy
        Vagrant::Action::Builder.new.tap do |b|
          b.use Call, IsState, :host_state_unknown do |env, b2|
            if env[:result]
              b2.use HostMachine
            end
          end

          b.use Call, IsState, :not_created do |env, b2|
            if env[:result]
              b2.use Message, I18n.t("docker_provider.messages.not_created")
              next
            end

            b2.use Call, DestroyConfirm do |env2, b3|
              if env2[:result]
                b3.use ConfigValidate
                b3.use EnvSet, :force_halt => true
                b3.use action_halt
                b3.use Destroy
                b3.use ProvisionerCleanup
              else
                b3.use Message, I18n.t("docker_provider.messages.will_not_destroy")
              end
            end
          end
        end
      end

      # This is the action that will exec into an SSH shell.
      def self.action_ssh
        Vagrant::Action::Builder.new.tap do |b|
          b.use Call, IsState, :not_created do |env, b2|
            if env[:result]
              b2.use Message, I18n.t("docker_provider.messages.not_created")
              next
            end

            b2.use Call, IsState, :running do |env2, b3|
              if !env2[:result]
                b3.use Message, I18n.t("docker_provider.messages.not_running")
                next
              end
              b3.use SSHExec
            end
          end
        end
      end

      # This is the action that will run a single SSH command.
      def self.action_ssh_run
        Vagrant::Action::Builder.new.tap do |b|
          b.use Call, IsState, :not_created do |env, b2|
            if env[:result]
              b2.use Message, I18n.t("docker_provider.messages.not_created")
              next
            end

            b2.use Call, IsState, :running do |env2, b3|
              if !env2[:result]
                raise Vagrant::Errors::VMNotRunningError
              end

              b3.use SSHRun
            end
          end
        end
      end

      def self.action_start
        Vagrant::Action::Builder.new.tap do |b|
          b.use ConfigValidate
          b.use Call, IsState, :running do |env, b2|
            # If the container is running, then our work here is done, exit
            next if env[:result]

            b2.use Provision
            b2.use Message, I18n.t("docker_provider.messages.starting")
            b2.use action_boot
          end
        end
      end

      def self.action_boot
        Vagrant::Action::Builder.new.tap do |b|
          # TODO: b.use SetHostname
          b.use Start

          b.use Call, HasSSH do |env, b2|
            if env[:result]
              b2.use WaitForCommunicator
            end
          end
        end
      end

      # The autoload farm
      action_root = Pathname.new(File.expand_path("../action", __FILE__))
      autoload :Create, action_root.join("create")
      autoload :Destroy, action_root.join("destroy")
      autoload :ForwardPorts, action_root.join("forward_ports")
      autoload :HasSSH, action_root.join("has_ssh")
      autoload :HostMachine, action_root.join("host_machine")
      autoload :Stop, action_root.join("stop")
      autoload :PrepareNFSValidIds, action_root.join("prepare_nfs_valid_ids")
      autoload :PrepareNFSSettings, action_root.join("prepare_nfs_settings")
      autoload :Start, action_root.join("start")
    end
  end
end