// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 querynode

import (
	"sync"
	"testing"

	"github.com/stretchr/testify/assert"

	"github.com/milvus-io/milvus/internal/util/typeutil"
)

func TestTSafe_TSafeWatcher(t *testing.T) {
	watcher := newTSafeWatcher()
	defer watcher.close()
	assert.NotNil(t, watcher)

	var wg sync.WaitGroup
	wg.Add(1)
	go func() {
		watcher.notify()
		wg.Done()
	}()
	wg.Wait()

	// wait notify, expect non-block here
	<-watcher.watcherChan()
}

func TestTSafe_TSafe(t *testing.T) {
	safe := newTSafe("TestTSafe-channel")
	assert.NotNil(t, safe)

	timestamp := safe.get()
	assert.Equal(t, typeutil.ZeroTimestamp, timestamp)

	watcher := newTSafeWatcher()
	defer watcher.close()
	assert.NotNil(t, watcher)

	err := safe.registerTSafeWatcher(watcher)
	assert.NotNil(t, safe.watcher)
	assert.NoError(t, err)

	targetTimestamp := Timestamp(1000)
	safe.set(targetTimestamp)

	timestamp = safe.get()
	assert.Equal(t, targetTimestamp, timestamp)
}

func TestTSafe_Dup(t *testing.T) {
	safe := newTSafe("TestTSafe-channel")
	assert.NotNil(t, safe)

	timestamp := safe.get()
	assert.Equal(t, typeutil.ZeroTimestamp, timestamp)

	watcher := newTSafeWatcher()
	defer watcher.close()
	assert.NotNil(t, watcher)

	err := safe.registerTSafeWatcher(watcher)
	assert.NoError(t, err)

	err = safe.registerTSafeWatcher(watcher)
	assert.Error(t, err)
}