// Copyright 2022 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 common

import (
	"os"
	"strings"
	"testing"
	"time"

	"go.etcd.io/etcd/tests/v3/framework/config"
)

func TestAlarm(t *testing.T) {
	testRunner.BeforeTest(t)

	clus := testRunner.NewCluster(t, config.ClusterConfig{ClusterSize: 3, QuotaBackendBytes: int64(13 * os.Getpagesize())})
	defer clus.Close()

	// test small put still works
	smallbuf := strings.Repeat("a", 64)
	if err := clus.Client().Put("1st_test", smallbuf); err != nil {
		t.Fatalf("alarmTest: put kv error (%v)", err)
	}

	// write some chunks to fill up the database
	buf := strings.Repeat("b", os.Getpagesize())
	for {
		if err := clus.Client().Put("2nd_test", buf); err != nil {
			if !strings.Contains(err.Error(), "etcdserver: mvcc: database space exceeded") {
				t.Fatal(err)
			}
			break
		}
	}

	// quota alarm should now be on
	_, err := clus.Client().Alarm("list")
	if err != nil {
		t.Fatalf("alarmTest: Alarm error (%v)", err)
	}

	// endpoint should not healthy
	if err := clus.Client().Health(); err == nil {
		t.Fatalf("endpoint should not healthy")
	}

	// check that Put is rejected when alarm is on
	if err := clus.Client().Put("3rd_test", smallbuf); err != nil {
		if !strings.Contains(err.Error(), "etcdserver: mvcc: database space exceeded") {
			t.Fatal(err)
		}
	}

	// get latest revision to compact
	sresp, err := clus.Client().Status()
	if err != nil {
		t.Fatalf("get endpoint status error: %v", err)
	}

	// make some space
	_, err = clus.Client().Compact(sresp[0].Header.Revision, config.CompactOption{Physical: true, Timeout: 10 * time.Second})
	if err != nil {
		t.Fatalf("alarmTest: Compact error (%v)", err)
	}

	if err = clus.Client().Defragment(config.DefragOption{Timeout: 10 * time.Second}); err != nil {
		t.Fatalf("alarmTest: defrag error (%v)", err)
	}

	// turn off alarm
	_, err = clus.Client().Alarm("disarm")
	if err != nil {
		t.Fatalf("alarmTest: Alarm error (%v)", err)
	}

	// put one more key below quota
	if err := clus.Client().Put("4th_test", smallbuf); err != nil {
		t.Fatal(err)
	}
}