// Copyright 2017 The prometheus-operator 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 prometheus

import (
	"reflect"
	"testing"

	monitoringv1 "github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1"
	"k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

	"github.com/kylelemons/godebug/pretty"
)

func TestListOptions(t *testing.T) {
	for i := 0; i < 1000; i++ {
		o := ListOptions("test")
		if o.LabelSelector != "app=prometheus,prometheus=test" && o.LabelSelector != "prometheus=test,app=prometheus" {
			t.Fatalf("LabelSelector not computed correctly\n\nExpected: \"app=prometheus,prometheus=test\"\n\nGot:      %#+v", o.LabelSelector)
		}
	}
}

func TestCreateStatefulSetInputHash(t *testing.T) {
	p1 := monitoringv1.Prometheus{}
	p1.Spec.Version = "v1.7.0"
	p2 := monitoringv1.Prometheus{}
	p2.Spec.Version = "v1.7.2"
	c := Config{}

	p1Hash, err := createSSetInputHash(p1, c, []string{})
	if err != nil {
		t.Fatal(err)
	}
	p2Hash, err := createSSetInputHash(p2, c, []string{})
	if err != nil {
		t.Fatal(err)
	}

	if p1Hash == p2Hash {
		t.Fatal("expected two different Prometheus CRDs to result in two different hash but got equal hash")
	}
}

func TestGetNodeAddresses(t *testing.T) {
	cases := []struct {
		name              string
		nodes             *v1.NodeList
		expectedAddresses []string
		expectedErrors    int
	}{
		{
			name: "simple",
			nodes: &v1.NodeList{
				Items: []v1.Node{
					v1.Node{
						ObjectMeta: metav1.ObjectMeta{
							Name: "node-0",
						},
						Status: v1.NodeStatus{
							Addresses: []v1.NodeAddress{
								v1.NodeAddress{
									Address: "10.0.0.1",
									Type:    v1.NodeInternalIP,
								},
							},
						},
					},
				},
			},
			expectedAddresses: []string{"10.0.0.1"},
			expectedErrors:    0,
		},
		{
			// Replicates #1815
			name: "missing ip on one node",
			nodes: &v1.NodeList{
				Items: []v1.Node{
					v1.Node{
						ObjectMeta: metav1.ObjectMeta{
							Name: "node-0",
						},
						Status: v1.NodeStatus{
							Addresses: []v1.NodeAddress{
								v1.NodeAddress{
									Address: "node-0",
									Type:    v1.NodeHostName,
								},
							},
						},
					},
					v1.Node{
						ObjectMeta: metav1.ObjectMeta{
							Name: "node-1",
						},
						Status: v1.NodeStatus{
							Addresses: []v1.NodeAddress{
								v1.NodeAddress{
									Address: "10.0.0.1",
									Type:    v1.NodeInternalIP,
								},
							},
						},
					},
				},
			},
			expectedAddresses: []string{"10.0.0.1"},
			expectedErrors:    1,
		},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			addrs, errs := getNodeAddresses(c.nodes)
			if len(errs) != c.expectedErrors {
				t.Errorf("Expected %d errors, got %d. Errors: %v", c.expectedErrors, len(errs), errs)
			}
			ips := make([]string, 0)
			for _, addr := range addrs {
				ips = append(ips, addr.IP)
			}
			if !reflect.DeepEqual(ips, c.expectedAddresses) {
				t.Error(pretty.Compare(ips, c.expectedAddresses))
			}
		})
	}
}
