package util

import (
	"fmt"
	"testing"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

	clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
)

func TestVerifyWhetherClustersExist(t *testing.T) {
	clusters := clusterv1alpha1.ClusterList{Items: []clusterv1alpha1.Cluster{
		{
			ObjectMeta: metav1.ObjectMeta{Name: "member1"},
		},
		{
			ObjectMeta: metav1.ObjectMeta{Name: "member2"},
		},
		{
			ObjectMeta: metav1.ObjectMeta{Name: "member3"},
		},
	}}
	tests := []struct {
		name     string
		input    []string
		clusters *clusterv1alpha1.ClusterList
		wantErr  error
	}{
		{
			name:     "input is nil",
			input:    nil,
			clusters: &clusters,
			wantErr:  nil,
		},
		{
			name:     "not exist",
			input:    []string{"member1", "member4"},
			clusters: &clusters,
			wantErr:  fmt.Errorf("clusters don't exist: member4"),
		},
		{
			name:     "exist",
			input:    []string{"member1"},
			clusters: &clusters,
			wantErr:  nil,
		},
		{
			name:     "clusterList is empty",
			input:    []string{"member1", "member2"},
			clusters: &clusterv1alpha1.ClusterList{Items: make([]clusterv1alpha1.Cluster, 0)},
			wantErr:  fmt.Errorf("clusters don't exist: member1,member2"),
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if isExist := VerifyClustersExist(tt.input, tt.clusters); !isErrorEqual(tt.wantErr, isExist) {
				t.Errorf("VerifyClustersExist want: %v, actually: %v", tt.wantErr, isExist)
			}
		})
	}
}

func isErrorEqual(want error, actual error) bool {
	if want == nil && actual == nil {
		return true
	}
	if want != nil && actual != nil && want.Error() == actual.Error() {
		return true
	}
	return false
}