/*
Copyright 2021 The Kubernetes 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 collections implements collection utilities.
package collections

import (
	"context"

	"github.com/pkg/errors"
	"sigs.k8s.io/controller-runtime/pkg/client"

	clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
)

// GetFilteredMachinesForCluster returns a list of machines that can be filtered or not.
// If no filter is supplied then all machines associated with the target cluster are returned.
func GetFilteredMachinesForCluster(ctx context.Context, c client.Reader, cluster *clusterv1.Cluster, filters ...Func) (Machines, error) {
	ml := &clusterv1.MachineList{}
	if err := c.List(
		ctx,
		ml,
		client.InNamespace(cluster.Namespace),
		client.MatchingLabels{
			clusterv1.ClusterNameLabel: cluster.Name,
		},
	); err != nil {
		return nil, errors.Wrap(err, "failed to list machines")
	}

	machines := FromMachineList(ml)
	return machines.Filter(filters...), nil
}
