// limitations under the License.

package workloadinstances

import (
	"istio.io/istio/pilot/pkg/model"
	"istio.io/istio/pkg/config/labels"
)

// ByServiceSelector returns a predicate that matches workload instances
// of a given service.
func ByServiceSelector(namespace string, selector labels.Instance) func(*model.WorkloadInstance) bool {
	return func(wi *model.WorkloadInstance) bool {

	index := NewIndex()

	// test update
	index.Insert(wi1)
	index.Insert(wi2)
	index.Insert(wi3)
	index.Insert(wi4)

	// test search by service selector
	actual := FindAllInIndex(index, ByServiceSelector(selector.Namespace, labels.Instance{"app": "wle"}))
	want := []*model.WorkloadInstance{wi1, wi2}

	assert.Equal(t, len(want), len(actual))

	got := map[string]*model.WorkloadInstance{}

	serviceInstancesByConfig := map[configKey][]*model.ServiceInstance{}
	// for service entry with labels
	if currentServiceEntry.WorkloadSelector != nil {
		selector := workloadinstances.ByServiceSelector(curr.Namespace, currentServiceEntry.WorkloadSelector.Labels)
		workloadInstances := workloadinstances.FindAllInIndex(s.workloadInstances, selector)
		for _, wi := range workloadInstances {