// Copyright 2016 Prometheus Team
// 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/lic:wenses/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 mem

import (
	"io/ioutil"
	"os"
	"reflect"
	"testing"
	"time"

	"github.com/kylelemons/godebug/pretty"
	"github.com/prometheus/alertmanager/provider"
	"github.com/prometheus/alertmanager/types"
	"github.com/prometheus/common/model"
)

func init() {
	pretty.CompareConfig.IncludeUnexported = true
}

func TestAlertsPut(t *testing.T) {
	dir, err := ioutil.TempDir("", "alerts_test")
	if err != nil {
		t.Fatal(err)
	}

	marker := types.NewMarker()
	alerts, err := NewAlerts(marker, 30*time.Minute, dir)
	if err != nil {
		t.Fatal(err)
	}

	var (
		t0 = time.Now()
		t1 = t0.Add(10 * time.Minute)
	)

	insert := []*types.Alert{
		{
			Alert: model.Alert{
				Labels:       model.LabelSet{"bar": "foo"},
				Annotations:  model.LabelSet{"foo": "bar"},
				StartsAt:     t0,
				EndsAt:       t1,
				GeneratorURL: "http://example.com/prometheus",
			},
			UpdatedAt: t0,
			Timeout:   false,
		}, {
			Alert: model.Alert{
				Labels:       model.LabelSet{"bar": "foo2"},
				Annotations:  model.LabelSet{"foo": "bar2"},
				StartsAt:     t0,
				EndsAt:       t1,
				GeneratorURL: "http://example.com/prometheus",
			},
			UpdatedAt: t0,
			Timeout:   false,
		}, {
			Alert: model.Alert{
				Labels:       model.LabelSet{"bar": "foo3"},
				Annotations:  model.LabelSet{"foo": "bar3"},
				StartsAt:     t0,
				EndsAt:       t1,
				GeneratorURL: "http://example.com/prometheus",
			},
			UpdatedAt: t0,
			Timeout:   false,
		},
	}

	if err := alerts.Put(insert...); err != nil {
		t.Fatalf("Insert failed: %s", err)
	}

	for i, a := range insert {
		res, err := alerts.Get(a.Fingerprint())
		if err != nil {
			t.Fatalf("retrieval error: %s", err)
		}
		if !alertsEqual(res, a) {
			t.Errorf("Unexpected alert: %d", i)
			t.Fatalf(pretty.Compare(res, a))
		}
	}
}

func TestAlertsGC(t *testing.T) {
	dir, err := ioutil.TempDir("", "alerts_test")
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(dir)

	marker := types.NewMarker()
	alerts, err := NewAlerts(marker, 200*time.Millisecond, dir)
	if err != nil {
		t.Fatal(err)
	}

	var (
		t0 = time.Now()
		t1 = t0.Add(100 * time.Millisecond)
	)

	insert := []*types.Alert{
		{
			Alert: model.Alert{
				Labels:       model.LabelSet{"bar": "foo"},
				Annotations:  model.LabelSet{"foo": "bar"},
				StartsAt:     t0,
				EndsAt:       t1,
				GeneratorURL: "http://example.com/prometheus",
			},
			UpdatedAt: t0,
			Timeout:   false,
		}, {
			Alert: model.Alert{
				Labels:       model.LabelSet{"bar": "foo2"},
				Annotations:  model.LabelSet{"foo": "bar2"},
				StartsAt:     t0,
				EndsAt:       t1,
				GeneratorURL: "http://example.com/prometheus",
			},
			UpdatedAt: t0,
			Timeout:   false,
		}, {
			Alert: model.Alert{
				Labels:       model.LabelSet{"bar": "foo3"},
				Annotations:  model.LabelSet{"foo": "bar3"},
				StartsAt:     t0,
				EndsAt:       t1,
				GeneratorURL: "http://example.com/prometheus",
			},
			UpdatedAt: t0,
			Timeout:   false,
		},
	}

	if err := alerts.Put(insert...); err != nil {
		t.Fatalf("Insert failed: %s", err)
	}

	for _, a := range insert {
		marker.SetActive(a.Fingerprint())
		if !marker.Active(a.Fingerprint()) {
			t.Errorf("error setting status: %v", a)
		}
	}

	time.Sleep(300 * time.Millisecond)

	for i, a := range insert {
		_, err := alerts.Get(a.Fingerprint())
		if err != provider.ErrNotFound {
			t.Errorf("alert %d didn't get GC'd", i)
		}

		s := marker.Status(a.Fingerprint())
		if s.State != types.AlertStateUnprocessed {
			t.Errorf("marker %d didn't get GC'd: %v", i, s)
		}
	}
}

func alertsEqual(a1, a2 *types.Alert) bool {
	if !reflect.DeepEqual(a1.Labels, a2.Labels) {
		return false
	}
	if !reflect.DeepEqual(a1.Annotations, a2.Annotations) {
		return false
	}
	if a1.GeneratorURL != a2.GeneratorURL {
		return false
	}
	if !a1.StartsAt.Equal(a2.StartsAt) {
		return false
	}
	if !a1.EndsAt.Equal(a2.EndsAt) {
		return false
	}
	if !a1.UpdatedAt.Equal(a2.UpdatedAt) {
		return false
	}
	return a1.Timeout == a2.Timeout
}

func alertListEqual(a1, a2 []*types.Alert) bool {
	if len(a1) != len(a2) {
		return false
	}
	for i, a := range a1 {
		if !alertsEqual(a, a2[i]) {
			return false
		}
	}
	return true
}