// Copyright 2023 The etcd 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 robustness

import (
	"path/filepath"
	"testing"
	"time"

	"go.etcd.io/etcd/api/v3/version"
	"go.etcd.io/etcd/tests/v3/framework/e2e"
	"go.etcd.io/etcd/tests/v3/robustness/failpoint"
	"go.etcd.io/etcd/tests/v3/robustness/traffic"
)

type TrafficProfile struct {
	Traffic traffic.Traffic
	Profile traffic.Profile
}

var trafficProfiles = []TrafficProfile{
	{
		Traffic: traffic.EtcdPut,
		Profile: traffic.HighTrafficProfile,
	},
	{
		Traffic: traffic.EtcdPutDeleteLease,
		Profile: traffic.LowTraffic,
	},
	{
		Traffic: traffic.Kubernetes,
		Profile: traffic.HighTrafficProfile,
	},
	{
		Traffic: traffic.Kubernetes,
		Profile: traffic.LowTraffic,
	},
}

type testScenario struct {
	name      string
	failpoint failpoint.Failpoint
	cluster   e2e.EtcdProcessClusterConfig
	traffic   traffic.Traffic
	profile   traffic.Profile
	watch     watchConfig
}

func scenarios(t *testing.T) []testScenario {
	v, err := e2e.GetVersionFromBinary(e2e.BinPath.Etcd)
	if err != nil {
		t.Fatalf("Failed checking etcd version binary, binary: %q, err: %v", e2e.BinPath.Etcd, err)
	}
	enableLazyFS := e2e.BinPath.LazyFSAvailable()
	baseOptions := []e2e.EPClusterOption{
		e2e.WithSnapshotCount(100),
		e2e.WithGoFailEnabled(true),
		e2e.WithCompactionBatchLimit(100),
		e2e.WithWatchProcessNotifyInterval(100 * time.Millisecond),
	}
	scenarios := []testScenario{}
	for _, tp := range trafficProfiles {
		name := filepath.Join(tp.Traffic.Name(), tp.Profile.Name, "ClusterOfSize1")
		clusterOfSize1Options := baseOptions
		clusterOfSize1Options = append(clusterOfSize1Options, e2e.WithClusterSize(1))
		// Add LazyFS only for traffic with lower QPS as it uses a lot of CPU lowering minimal QPS.
		if enableLazyFS && tp.Profile.MinimalQPS <= 100 {
			clusterOfSize1Options = append(clusterOfSize1Options, e2e.WithLazyFSEnabled(true))
			name = filepath.Join(name, "LazyFS")
		}
		scenarios = append(scenarios, testScenario{
			name:    name,
			traffic: tp.Traffic,
			profile: tp.Profile,
			cluster: *e2e.NewConfig(clusterOfSize1Options...),
		})
	}

	for _, tp := range trafficProfiles {
		name := filepath.Join(tp.Traffic.Name(), tp.Profile.Name, "ClusterOfSize3")
		clusterOfSize3Options := baseOptions
		clusterOfSize3Options = append(clusterOfSize3Options, e2e.WithIsPeerTLS(true))
		clusterOfSize3Options = append(clusterOfSize3Options, e2e.WithPeerProxy(true))
		if !v.LessThan(version.V3_6) {
			clusterOfSize3Options = append(clusterOfSize3Options, e2e.WithSnapshotCatchUpEntries(100))
		}
		scenarios = append(scenarios, testScenario{
			name:    name,
			traffic: tp.Traffic,
			profile: tp.Profile,
			cluster: *e2e.NewConfig(clusterOfSize3Options...),
		})
	}
	scenarios = append(scenarios, testScenario{
		name:      "Issue14370",
		failpoint: failpoint.RaftBeforeSavePanic,
		profile:   traffic.LowTraffic,
		traffic:   traffic.EtcdPutDeleteLease,
		cluster: *e2e.NewConfig(
			e2e.WithClusterSize(1),
			e2e.WithGoFailEnabled(true),
		),
	})
	scenarios = append(scenarios, testScenario{
		name:      "Issue14685",
		failpoint: failpoint.DefragBeforeCopyPanic,
		profile:   traffic.LowTraffic,
		traffic:   traffic.EtcdPutDeleteLease,
		cluster: *e2e.NewConfig(
			e2e.WithClusterSize(1),
			e2e.WithGoFailEnabled(true),
		),
	})
	scenarios = append(scenarios, testScenario{
		name:      "Issue13766",
		failpoint: failpoint.KillFailpoint,
		profile:   traffic.HighTrafficProfile,
		traffic:   traffic.EtcdPut,
		cluster: *e2e.NewConfig(
			e2e.WithSnapshotCount(100),
		),
	})
	scenarios = append(scenarios, testScenario{
		name: "Issue15220",
		watch: watchConfig{
			requestProgress: true,
		},
		profile: traffic.LowTraffic,
		traffic: traffic.EtcdPutDeleteLease,
		cluster: *e2e.NewConfig(
			e2e.WithClusterSize(1),
		),
	})
	// TODO: Deflake waiting for waiting until snapshot for etcd versions that don't support setting snapshot catchup entries.
	if v.Compare(version.V3_6) >= 0 {
		scenarios = append(scenarios, testScenario{
			name:      "Issue15271",
			failpoint: failpoint.BlackholeUntilSnapshot,
			profile:   traffic.HighTrafficProfile,
			traffic:   traffic.EtcdPut,
			cluster: *e2e.NewConfig(
				e2e.WithSnapshotCatchUpEntries(100),
				e2e.WithSnapshotCount(100),
				e2e.WithPeerProxy(true),
				e2e.WithIsPeerTLS(true),
			),
		})
	}
	return scenarios
}