/*
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 node

import (
	"context"
	"fmt"

	v1 "k8s.io/api/core/v1"
	"sigs.k8s.io/controller-runtime/pkg/client"

	"github.com/aws/karpenter-core/pkg/utils/pod"
)

// GetNodePods gets the list of schedulable pods from a variadic list of nodes
// It ignores pods that are owned by the node, a daemonset or are in a terminal
// or terminating state
func GetNodePods(ctx context.Context, kubeClient client.Client, nodes ...*v1.Node) ([]*v1.Pod, error) {
	var pods []*v1.Pod
	for _, node := range nodes {
		var podList v1.PodList
		if err := kubeClient.List(ctx, &podList, client.MatchingFields{"spec.nodeName": node.Name}); err != nil {
			return nil, fmt.Errorf("listing pods, %w", err)
		}
		for i := range podList.Items {
			// these pods don't need to be rescheduled
			if pod.IsOwnedByNode(&podList.Items[i]) ||
				pod.IsOwnedByDaemonSet(&podList.Items[i]) ||
				pod.IsTerminal(&podList.Items[i]) ||
				pod.IsTerminating(&podList.Items[i]) {
				continue
			}
			pods = append(pods, &podList.Items[i])
		}
	}
	return pods, nil
}

func GetCondition(n *v1.Node, match v1.NodeConditionType) v1.NodeCondition {
	for _, condition := range n.Status.Conditions {
		if condition.Type == match {
			return condition
		}
	}
	return v1.NodeCondition{}
}