package util

import (
	"context"

	corev1 "k8s.io/api/core/v1"
	"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions"
	"k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/types"
	"sigs.k8s.io/controller-runtime/pkg/client"
)

// OAMLabel defines the label of namespace automatically created by kubevela
var OAMLabel = map[string]string{"app.kubernetes.io/part-of": "kubevela"}

// DoesNamespaceExist check namespace exist
func DoesNamespaceExist(c client.Client, namespace string) (bool, error) {
	var ns corev1.Namespace
	err := c.Get(context.Background(), types.NamespacedName{Name: namespace}, &ns)
	if err != nil {
		return false, client.IgnoreNotFound(err)
	}
	return true, nil
}

// NewNamespace create namespace
func NewNamespace(c client.Client, namespace string) error {
	ns := &corev1.Namespace{ObjectMeta: metav1.ObjectMeta{Name: namespace,
		// marking a special label for prometheus monitoring.
		Labels: OAMLabel}}
	err := c.Create(context.Background(), ns)
	if err != nil {
		return err
	}
	return nil
}

// DoesCRDExist check CRD exist
func DoesCRDExist(cxt context.Context, c client.Client, crdName string) (bool, error) {
	err := c.Get(cxt, types.NamespacedName{Name: crdName}, &apiextensions.CustomResourceDefinition{})
	if err != nil {
		if errors.IsNotFound(err) {
			return false, nil
		}
		return false, err
	}
	return true, nil
}