/*
 * 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 olm

import (
	"context"

	k8sutils "github.com/citrusframework/yaks/pkg/util/kubernetes"
	operatorsv1 "github.com/operator-framework/api/pkg/operators/v1"
	operatorsv1alpha1 "github.com/operator-framework/api/pkg/operators/v1alpha1"
	operatorsv1alpha2 "github.com/operator-framework/api/pkg/operators/v1alpha2"
	k8serrors "k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/client-go/kubernetes"
)

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

	return false, nil
}

func isAvailable(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 getOLMGroupVersions() []schema.GroupVersion {
	return []schema.GroupVersion{
		operatorsv1alpha1.SchemeGroupVersion,
		operatorsv1alpha2.SchemeGroupVersion,
		operatorsv1.SchemeGroupVersion,
	}
}
