// Get returns a streamer resource with the contents of the build log
func (r *REST) Get(ctx kapi.Context, name string, opts runtime.Object) (runtime.Object, error) {
	buildLogOpts, ok := opts.(*api.BuildLogOptions)
	if !ok {
		return nil, errors.NewBadRequest("did not get an expected options.")
	}
	obj, err := r.Getter.Get(ctx, name)
	if err != nil {
		return nil, err
	}
	build := obj.(*api.Build)
	switch build.Status.Phase {
	// Build has not launched, wait til it runs
	case api.BuildPhaseNew, api.BuildPhasePending:
		if buildLogOpts.NoWait {
			glog.V(4).Infof("Build %s/%s is in %s state. No logs to retrieve yet.", build.Namespace, name, build.Status.Phase)
			// return empty content if not waiting for build
			return &genericrest.LocationStreamer{}, nil
		}
		glog.V(4).Infof("Build %s/%s is in %s state, waiting for Build to start", build.Namespace, name, build.Status.Phase)
		latest, ok, err := registry.WaitForRunningBuild(r.Watcher, ctx, build, r.Timeout)
		if err != nil {
			return nil, errors.NewBadRequest(fmt.Sprintf("unable to wait for build %s to run: %v", name, err))
		}
		switch latest.Status.Phase {
		case api.BuildPhaseError:
			return nil, errors.NewBadRequest(fmt.Sprintf("build %s encountered an error: %s", name, buildutil.NoBuildLogsMessage))
		case api.BuildPhaseCancelled:
			return nil, errors.NewBadRequest(fmt.Sprintf("build %s was cancelled: %s", name, buildutil.NoBuildLogsMessage))
		}
		if !ok {
			return nil, errors.NewTimeoutError(fmt.Sprintf("timed out waiting for build %s to start after %s", build.Name, r.Timeout), 1)
		}

	// The build was cancelled
	case api.BuildPhaseCancelled:
		return nil, errors.NewBadRequest(fmt.Sprintf("build %s was cancelled. %s", name, buildutil.NoBuildLogsMessage))

	// An error occurred launching the build, return an error
	case api.BuildPhaseError:
		return nil, errors.NewBadRequest(fmt.Sprintf("build %s is in an error state. %s", name, buildutil.NoBuildLogsMessage))
	}
	// The container should be the default build container, so setting it to blank
	buildPodName := buildutil.GetBuildPodName(build)
	logOpts := api.BuildToPodLogOptions(buildLogOpts)
	location, transport, err := pod.LogLocation(r.PodGetter, r.ConnectionInfo, ctx, buildPodName, logOpts)
	if err != nil {
		if errors.IsNotFound(err) {
			return nil, errors.NewNotFound("pod", buildPodName)
		}
		return nil, errors.NewBadRequest(err.Error())
	}
	return &genericrest.LocationStreamer{
		Location:        location,
		Transport:       transport,
		ContentType:     "text/plain",
		Flush:           buildLogOpts.Follow,
		ResponseChecker: genericrest.NewGenericHttpResponseChecker("Pod", buildPodName),
	}, nil
}

func ValidateBuildLogOptions(opts *buildapi.BuildLogOptions) fielderrors.ValidationErrorList {
	allErrs := fielderrors.ValidationErrorList{}

	// TODO: Replace by validating PodLogOptions via BuildLogOptions once it's bundled in
	popts := buildapi.BuildToPodLogOptions(opts)
	if errs := validation.ValidatePodLogOptions(popts); len(errs) > 0 {
		allErrs = append(allErrs, errs...)
	}

	return allErrs
}

func ValidateBuildLogOptions(opts *buildapi.BuildLogOptions) fielderrors.ValidationErrorList {
	allErrs := fielderrors.ValidationErrorList{}

	// TODO: Replace by validating PodLogOptions via BuildLogOptions once it's bundled in
	popts := buildapi.BuildToPodLogOptions(opts)
	if errs := validation.ValidatePodLogOptions(popts); len(errs) > 0 {
		allErrs = append(allErrs, errs...)
	}

	if opts.Version != nil && *opts.Version <= 0 {
		allErrs = append(allErrs, fielderrors.NewFieldInvalid("version", *opts.Version, "build version must be greater than 0"))
	}

	return allErrs
}

func ValidateBuildLogOptions(opts *buildapi.BuildLogOptions) field.ErrorList {
	allErrs := field.ErrorList{}

	// TODO: Replace by validating PodLogOptions via BuildLogOptions once it's bundled in
	popts := buildapi.BuildToPodLogOptions(opts)
	if errs := validation.ValidatePodLogOptions(popts); len(errs) > 0 {
		allErrs = append(allErrs, errs...)
	}

	if opts.Version != nil && *opts.Version <= 0 {
		allErrs = append(allErrs, field.Invalid(field.NewPath("version"), *opts.Version, "build version must be greater than 0"))
	}
	if opts.Version != nil && opts.Previous {
		allErrs = append(allErrs, field.Invalid(field.NewPath("previous"), opts.Previous, "cannot use previous when a version is specified"))
	}
	return allErrs
}