// Process transforms Template object into List object. It generates
// Parameter values using the defined set of generators first, and then it
// substitutes all Parameter expression occurrences with their corresponding
// values (currently in the containers' Environment variables only).
func (p *Processor) Process(template *api.Template) fielderrors.ValidationErrorList {
	templateErrors := fielderrors.ValidationErrorList{}

	if err := p.GenerateParameterValues(template); err != nil {
		return append(templateErrors.Prefix("Template"), fielderrors.NewFieldInvalid("parameters", err, "failure to generate parameter value"))
	}

	for i, item := range template.Objects {
		if obj, ok := item.(*runtime.Unknown); ok {
			// TODO: use runtime.DecodeList when it returns ValidationErrorList
			obj, err := runtime.UnstructuredJSONScheme.Decode(obj.RawJSON)
			if err != nil {
				util.ReportError(&templateErrors, i, *fielderrors.NewFieldInvalid("objects", err, "unable to handle object"))
				continue
			}
			item = obj
		}

		newItem, err := p.SubstituteParameters(template.Parameters, item)
		if err != nil {
			util.ReportError(&templateErrors, i, *fielderrors.NewFieldInvalid("parameters", template.Parameters, err.Error()))
		}
		stripNamespace(newItem)
		if err := util.AddObjectLabels(newItem, template.ObjectLabels); err != nil {
			util.ReportError(&templateErrors, i, *fielderrors.NewFieldInvalid("labels", err, "label could not be applied"))
		}
		template.Objects[i] = newItem
	}

	return templateErrors
}

// Process transforms Template object into List object. It generates
// Parameter values using the defined set of generators first, and then it
// substitutes all Parameter expression occurrences with their corresponding
// values (currently in the containers' Environment variables only).
func (p *Processor) Process(template *api.Template) fielderrors.ValidationErrorList {
	templateErrors := fielderrors.ValidationErrorList{}

	if err, badParam := p.GenerateParameterValues(template); err != nil {
		return append(templateErrors.Prefix("Template"), fielderrors.NewFieldInvalid("parameters", *badParam, err.Error()))
	}

	for i, item := range template.Objects {
		if obj, ok := item.(*runtime.Unknown); ok {
			// TODO: use runtime.DecodeList when it returns ValidationErrorList
			decodedObj, err := runtime.UnstructuredJSONScheme.Decode(obj.RawJSON)
			if err != nil {
				util.ReportError(&templateErrors, i, *fielderrors.NewFieldInvalid("objects", obj, "unable to handle object"))
				continue
			}
			item = decodedObj
		}

		newItem, err := p.SubstituteParameters(template.Parameters, item)
		if err != nil {
			util.ReportError(&templateErrors, i, *fielderrors.NewFieldInvalid("parameters", template.Parameters, err.Error()))
		}
		// If an object definition's metadata includes a namespace field, the field will be stripped out of
		// the definition during template instantiation.  This is necessary because all objects created during
		// instantiation are placed into the target namespace, so it would be invalid for the object to declare
		//a different namespace.
		stripNamespace(newItem)
		if err := util.AddObjectLabels(newItem, template.ObjectLabels); err != nil {
			util.ReportError(&templateErrors, i, *fielderrors.NewFieldInvalid("labels", err, "label could not be applied"))
		}
		template.Objects[i] = newItem
	}

	return templateErrors
}

func setLabels(labels map[string]string, result *newcmd.AppResult) error {
	for _, object := range result.List.Items {
		err := util.AddObjectLabels(object, labels)
		if err != nil {
			return err
		}
	}
	return nil
}

func setLabels(labels map[string]string, result *newcmd.AppResult) error {
	if len(labels) == 0 {
		if len(result.Name) > 0 {
			labels = map[string]string{"app": result.Name}
		}
	}
	for _, object := range result.List.Items {
		err := util.AddObjectLabels(object, labels)
		if err != nil {
			return err
		}
	}
	return nil
}

// Process transforms Template object into List object. It generates
// Parameter values using the defined set of generators first, and then it
// substitutes all Parameter expression occurrences with their corresponding
// values (currently in the containers' Environment variables only).
func (p *Processor) Process(template *api.Template) field.ErrorList {
	templateErrors := field.ErrorList{}

	if fieldError := p.GenerateParameterValues(template); fieldError != nil {
		return append(templateErrors, fieldError)
	}

	// Place parameters into a map for efficient lookup
	paramMap := make(map[string]api.Parameter)
	for _, param := range template.Parameters {
		paramMap[param.Name] = param
	}

	// Perform parameter substitution on the template's user message. This can be used to
	// instruct a user on next steps for the template.
	template.Message = p.EvaluateParameterSubstitution(paramMap, template.Message)

	itemPath := field.NewPath("item")
	for i, item := range template.Objects {
		idxPath := itemPath.Index(i)
		if obj, ok := item.(*runtime.Unknown); ok {
			// TODO: use runtime.DecodeList when it returns ValidationErrorList
			decodedObj, err := runtime.Decode(runtime.UnstructuredJSONScheme, obj.Raw)
			if err != nil {
				templateErrors = append(templateErrors, field.Invalid(idxPath.Child("objects"), obj, fmt.Sprintf("unable to handle object: %v", err)))
				continue
			}
			item = decodedObj
		}

		newItem, err := p.SubstituteParameters(paramMap, item)
		if err != nil {
			templateErrors = append(templateErrors, field.Invalid(idxPath.Child("parameters"), template.Parameters, err.Error()))
		}
		// If an object definition's metadata includes a namespace field, the field will be stripped out of
		// the definition during template instantiation.  This is necessary because all objects created during
		// instantiation are placed into the target namespace, so it would be invalid for the object to declare
		//a different namespace.
		stripNamespace(newItem)
		if err := util.AddObjectLabels(newItem, template.ObjectLabels); err != nil {
			templateErrors = append(templateErrors, field.Invalid(idxPath.Child("labels"),
				template.ObjectLabels, fmt.Sprintf("label could not be applied: %v", err)))
		}
		template.Objects[i] = newItem
	}

	return templateErrors
}

func setLabels(c *cobra.Command, result *newcmd.AppResult) error {
	label := cmdutil.GetFlagString(c, "labels")
	if len(label) != 0 {
		lbl, err := ctl.ParseLabels(label)
		if err != nil {
			return err
		}
		for _, object := range result.List.Items {
			err = util.AddObjectLabels(object, lbl)
			if err != nil {
				return err
			}
		}
	}

	return nil
}