// Copyright 2021 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 schema

import (
	"testing"
	"time"

	betesting "go.etcd.io/etcd/server/v3/storage/backend/testing"
)

func TestUpgradeDowngrade(t *testing.T) {
	tcs := []struct {
		name                      string
		change                    schemaChange
		expectStateAfterUpgrade   map[string]string
		expectStateAfterDowngrade map[string]string
	}{
		{
			name:                    "addNewField empty",
			change:                  addNewField(Meta, []byte("/test"), []byte("1")),
			expectStateAfterUpgrade: map[string]string{"/test": "1"},
		},
	}
	for _, tc := range tcs {
		t.Run(tc.name, func(t *testing.T) {
			be, _ := betesting.NewTmpBackend(t, time.Microsecond, 10)
			defer be.Close()
			tx := be.BatchTx()
			if tx == nil {
				t.Fatal("batch tx is nil")
			}
			tx.Lock()
			defer tx.Unlock()
			UnsafeCreateMetaBucket(tx)

			_, err := tc.change.upgradeAction().unsafeDo(tx)
			if err != nil {
				t.Errorf("Failed to upgrade, err: %v", err)
			}
			assertBucketState(t, tx, Meta, tc.expectStateAfterUpgrade)
			_, err = tc.change.downgradeAction().unsafeDo(tx)
			if err != nil {
				t.Errorf("Failed to downgrade, err: %v", err)
			}
			assertBucketState(t, tx, Meta, tc.expectStateAfterDowngrade)
		})
	}
}