/*
 * Copyright the original author or 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 camelk

import (
	"context"

	k8sutils "github.com/citrusframework/yaks/pkg/util/kubernetes"
	k8serrors "k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/client-go/kubernetes"
)

// IsInstalled returns true if we are connected to a cluster with Camel K installed
//
// This method should not be called from the operator, as it might require permissions that are not available.
func IsInstalled(ctx context.Context, c kubernetes.Interface) (bool, error) {
	// check some Camel K APIs
	for _, api := range getRequiredCamelKGroupVersions() {
		if installed, err := isInstalled(c, api); err != nil {
			return false, err
		} else if installed {
			return true, nil
		}
	}
	return false, nil
}

func isInstalled(c kubernetes.Interface, api schema.GroupVersion) (bool, error) {
	_, err := c.Discovery().ServerResourcesForGroupVersion(api.String())
	if err != nil && (k8serrors.IsNotFound(err) || k8sutils.IsUnknownAPIError(err)) {
		return false, nil
	} else if err != nil {
		return false, err
	}
	return true, nil
}

func getRequiredCamelKGroupVersions() []schema.GroupVersion {
	apis := make(map[schema.GroupVersion]bool)
	res := make([]schema.GroupVersion, 0)
	for _, gvk := range RequiredKinds {
		if !apis[gvk.GroupVersion()] {
			apis[gvk.GroupVersion()] = true
			res = append(res, gvk.GroupVersion())
		}
	}
	return res
}
