// Copyright 2013 The Prometheus 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 retrieval

import (
	"reflect"
	"testing"
	"time"

	"github.com/golang/protobuf/proto"

	clientmodel "github.com/prometheus/client_golang/model"

	"github.com/prometheus/prometheus/config"
	pb "github.com/prometheus/prometheus/config/generated"
)

func TestTargetManagerChan(t *testing.T) {
	testJob1 := &config.ScrapeConfig{pb.ScrapeConfig{
		JobName:        proto.String("test_job1"),
		ScrapeInterval: proto.String("1m"),
		TargetGroup: []*pb.TargetGroup{
			{Target: []string{"example.org:80", "example.com:80"}},
		}},
	}
	prov1 := &fakeTargetProvider{
		sources: []string{"src1", "src2"},
		update:  make(chan *config.TargetGroup),
	}

	targetManager := &TargetManager{
		sampleAppender: nopAppender{},
		providers: map[*config.ScrapeConfig][]TargetProvider{
			testJob1: []TargetProvider{prov1},
		},
		targets: make(map[string][]Target),
	}
	go targetManager.Run()
	defer targetManager.Stop()

	sequence := []struct {
		tgroup   *config.TargetGroup
		expected map[string][]clientmodel.LabelSet
	}{
		{
			tgroup: &config.TargetGroup{
				Source: "src1",
				Targets: []clientmodel.LabelSet{
					{clientmodel.AddressLabel: "test-1:1234"},
					{clientmodel.AddressLabel: "test-2:1234", "label": "set"},
					{clientmodel.AddressLabel: "test-3:1234"},
				},
			},
			expected: map[string][]clientmodel.LabelSet{
				"test_job1:src1": {
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-1:1234"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-2:1234", "label": "set"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-3:1234"},
				},
			},
		}, {
			tgroup: &config.TargetGroup{
				Source: "src2",
				Targets: []clientmodel.LabelSet{
					{clientmodel.AddressLabel: "test-1:1235"},
					{clientmodel.AddressLabel: "test-2:1235"},
					{clientmodel.AddressLabel: "test-3:1235"},
				},
				Labels: clientmodel.LabelSet{"group": "label"},
			},
			expected: map[string][]clientmodel.LabelSet{
				"test_job1:src1": {
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-1:1234"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-2:1234", "label": "set"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-3:1234"},
				},
				"test_job1:src2": {
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-1:1235", "group": "label"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-2:1235", "group": "label"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-3:1235", "group": "label"},
				},
			},
		}, {
			tgroup: &config.TargetGroup{
				Source:  "src2",
				Targets: []clientmodel.LabelSet{},
			},
			expected: map[string][]clientmodel.LabelSet{
				"test_job1:src1": {
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-1:1234"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-2:1234", "label": "set"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-3:1234"},
				},
			},
		}, {
			tgroup: &config.TargetGroup{
				Source: "src1",
				Targets: []clientmodel.LabelSet{
					{clientmodel.AddressLabel: "test-1:1234", "added": "label"},
					{clientmodel.AddressLabel: "test-3:1234"},
					{clientmodel.AddressLabel: "test-4:1234", "fancy": "label"},
				},
			},
			expected: map[string][]clientmodel.LabelSet{
				"test_job1:src1": {
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-1:1234", "added": "label"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-3:1234"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "test-4:1234", "fancy": "label"},
				},
			},
		},
	}

	for i, step := range sequence {
		prov1.update <- step.tgroup

		<-time.After(1 * time.Millisecond)

		if len(targetManager.targets) != len(step.expected) {
			t.Fatalf("step %d: sources mismatch %v, %v", targetManager.targets, step.expected)
		}

		for source, actTargets := range targetManager.targets {
			expTargets, ok := step.expected[source]
			if !ok {
				t.Fatalf("step %d: unexpected source %q: %v", i, source, actTargets)
			}
			for _, expt := range expTargets {
				found := false
				for _, actt := range actTargets {
					if reflect.DeepEqual(expt, actt.BaseLabels()) {
						found = true
						break
					}
				}
				if !found {
					t.Errorf("step %d: expected target %v not found in actual targets", i, expt)
				}
			}
		}
	}
}

func TestTargetManagerConfigUpdate(t *testing.T) {
	testJob1 := &pb.ScrapeConfig{
		JobName:        proto.String("test_job1"),
		ScrapeInterval: proto.String("1m"),
		TargetGroup: []*pb.TargetGroup{
			{Target: []string{"example.org:80", "example.com:80"}},
		},
	}
	testJob2 := &pb.ScrapeConfig{
		JobName:        proto.String("test_job2"),
		ScrapeInterval: proto.String("1m"),
		TargetGroup: []*pb.TargetGroup{
			{Target: []string{"example.org:8080", "example.com:8081"}},
			{Target: []string{"test.com:1234"}},
		},
	}

	sequence := []struct {
		scrapeConfigs []*pb.ScrapeConfig
		expected      map[string][]clientmodel.LabelSet
	}{
		{
			scrapeConfigs: []*pb.ScrapeConfig{testJob1},
			expected: map[string][]clientmodel.LabelSet{
				"test_job1:static:0": {
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "example.org:80"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "example.com:80"},
				},
			},
		}, {
			scrapeConfigs: []*pb.ScrapeConfig{testJob1},
			expected: map[string][]clientmodel.LabelSet{
				"test_job1:static:0": {
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "example.org:80"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "example.com:80"},
				},
			},
		}, {
			scrapeConfigs: []*pb.ScrapeConfig{testJob1, testJob2},
			expected: map[string][]clientmodel.LabelSet{
				"test_job1:static:0": {
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "example.org:80"},
					{clientmodel.JobLabel: "test_job1", clientmodel.InstanceLabel: "example.com:80"},
				},
				"test_job2:static:0": {
					{clientmodel.JobLabel: "test_job2", clientmodel.InstanceLabel: "example.org:8080"},
					{clientmodel.JobLabel: "test_job2", clientmodel.InstanceLabel: "example.com:8081"},
				},
				"test_job2:static:1": {
					{clientmodel.JobLabel: "test_job2", clientmodel.InstanceLabel: "test.com:1234"},
				},
			},
		}, {
			scrapeConfigs: []*pb.ScrapeConfig{},
			expected:      map[string][]clientmodel.LabelSet{},
		}, {
			scrapeConfigs: []*pb.ScrapeConfig{testJob2},
			expected: map[string][]clientmodel.LabelSet{
				"test_job2:static:0": {
					{clientmodel.JobLabel: "test_job2", clientmodel.InstanceLabel: "example.org:8080"},
					{clientmodel.JobLabel: "test_job2", clientmodel.InstanceLabel: "example.com:8081"},
				},
				"test_job2:static:1": {
					{clientmodel.JobLabel: "test_job2", clientmodel.InstanceLabel: "test.com:1234"},
				},
			},
		},
	}

	targetManager, err := NewTargetManager(config.Config{}, nopAppender{})
	if err != nil {
		t.Fatal(err)
	}
	targetManager.Run()
	defer targetManager.Stop()

	for i, step := range sequence {
		cfg := pb.PrometheusConfig{
			ScrapeConfig: step.scrapeConfigs,
		}
		err := targetManager.ApplyConfig(config.Config{cfg})
		if err != nil {
			t.Fatal(err)
		}

		<-time.After(1 * time.Millisecond)

		if len(targetManager.targets) != len(step.expected) {
			t.Fatalf("step %d: sources mismatch %v, %v", targetManager.targets, step.expected)
		}

		for source, actTargets := range targetManager.targets {
			expTargets, ok := step.expected[source]
			if !ok {
				t.Fatalf("step %d: unexpected source %q: %v", i, source, actTargets)
			}
			for _, expt := range expTargets {
				found := false
				for _, actt := range actTargets {
					if reflect.DeepEqual(expt, actt.BaseLabels()) {
						found = true
						break
					}
				}
				if !found {
					t.Errorf("step %d: expected target %v for %q not found in actual targets", i, expt, source)
				}
			}
		}
	}
}