/*
Copyright 2018 The Argoproj Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package nats

import (
	"context"
	"fmt"

	"github.com/argoproj/argo-events/pkg/apis/events/v1alpha1"
)

// ValidateEventSource validates nats event source
func (listener *EventListener) ValidateEventSource(ctx context.Context) error {
	return validate(&listener.NATSEventSource)
}

func validate(eventSource *v1alpha1.NATSEventsSource) error {
	if eventSource == nil {
		return v1alpha1.ErrNilEventSource
	}
	if eventSource.URL == "" {
		return fmt.Errorf("url must be specified")
	}
	if eventSource.Subject == "" {
		return fmt.Errorf("subject must be specified")
	}
	if eventSource.TLS != nil {
		return v1alpha1.ValidateTLSConfig(eventSource.TLS)
	}
	if eventSource.Queue != nil && *eventSource.Queue == "" {
		return fmt.Errorf("queue group cannot be empty if specified")
	}
	return nil
}
