// Copyright 2017 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 integration

import (
	"context"
	"testing"

	"github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
	"github.com/coreos/etcd/integration"
	"github.com/coreos/etcd/pkg/testutil"
)

func TestMaintenanceHashKV(t *testing.T) {
	defer testutil.AfterTest(t)

	clus := integration.NewClusterV3(t, &integration.ClusterConfig{Size: 3})
	defer clus.Terminate(t)

	for i := 0; i < 3; i++ {
		if _, err := clus.RandClient().Put(context.Background(), "foo", "bar"); err != nil {
			t.Fatal(err)
		}
	}

	var hv uint32
	for i := 0; i < 3; i++ {
		cli := clus.Client(i)
		// ensure writes are replicated
		if _, err := cli.Get(context.TODO(), "foo"); err != nil {
			t.Fatal(err)
		}
		hresp, err := cli.HashKV(context.Background(), clus.Members[i].GRPCAddr(), 0)
		if err != nil {
			t.Fatal(err)
		}
		if hv == 0 {
			hv = hresp.Hash
			continue
		}
		if hv != hresp.Hash {
			t.Fatalf("#%d: hash expected %d, got %d", i, hv, hresp.Hash)
		}
	}
}

func TestMaintenanceMoveLeader(t *testing.T) {
	defer testutil.AfterTest(t)

	clus := integration.NewClusterV3(t, &integration.ClusterConfig{Size: 3})
	defer clus.Terminate(t)

	oldLeadIdx := clus.WaitLeader(t)
	targetIdx := (oldLeadIdx + 1) % 3
	target := uint64(clus.Members[targetIdx].ID())

	cli := clus.Client(targetIdx)
	_, err := cli.MoveLeader(context.Background(), target)
	if err != rpctypes.ErrNotLeader {
		t.Fatalf("error expected %v, got %v", rpctypes.ErrNotLeader, err)
	}

	cli = clus.Client(oldLeadIdx)
	_, err = cli.MoveLeader(context.Background(), target)
	if err != nil {
		t.Fatal(err)
	}

	leadIdx := clus.WaitLeader(t)
	lead := uint64(clus.Members[leadIdx].ID())
	if target != lead {
		t.Fatalf("new leader expected %d, got %d", target, lead)
	}
}