// Copyright (C) 2019-2020 Zilliz. All rights reserved.
//
// 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 rootcoord

import (
	"context"
	"errors"
	"testing"

	"github.com/milvus-io/milvus/internal/types"
	"github.com/milvus-io/milvus/internal/util/sessionutil"
	"github.com/stretchr/testify/assert"
	clientv3 "go.etcd.io/etcd/client/v3"
)

func TestProxyClientManager_GetProxyClients(t *testing.T) {
	Params.Init()

	core, err := NewCore(context.Background(), nil)
	assert.Nil(t, err)
	cli, err := clientv3.New(clientv3.Config{Endpoints: Params.EtcdEndpoints})
	assert.Nil(t, err)
	core.etcdCli = cli

	core.SetNewProxyClient(
		func(se *sessionutil.Session) (types.Proxy, error) {
			return nil, errors.New("failed")
		},
	)

	pcm := newProxyClientManager(core)

	session := &sessionutil.Session{
		ServerID: 100,
		Address:  "localhost",
	}

	sessions := []*sessionutil.Session{session}
	pcm.GetProxyClients(sessions)
}

func TestProxyClientManager_AddProxyClient(t *testing.T) {
	Params.Init()

	core, err := NewCore(context.Background(), nil)
	assert.Nil(t, err)
	cli, err := clientv3.New(clientv3.Config{Endpoints: Params.EtcdEndpoints})
	assert.Nil(t, err)
	core.etcdCli = cli

	core.SetNewProxyClient(
		func(se *sessionutil.Session) (types.Proxy, error) {
			return nil, errors.New("failed")
		},
	)

	pcm := newProxyClientManager(core)

	session := &sessionutil.Session{
		ServerID: 100,
		Address:  "localhost",
	}

	pcm.AddProxyClient(session)
}

func TestProxyClientManager_InvalidateCollectionMetaCache(t *testing.T) {
	Params.Init()
	ctx := context.Background()

	core, err := NewCore(ctx, nil)
	assert.Nil(t, err)
	cli, err := clientv3.New(clientv3.Config{Endpoints: Params.EtcdEndpoints})
	assert.Nil(t, err)
	core.etcdCli = cli

	pcm := newProxyClientManager(core)

	pcm.InvalidateCollectionMetaCache(ctx, nil)

	core.SetNewProxyClient(
		func(se *sessionutil.Session) (types.Proxy, error) {
			return nil, nil
		},
	)

	session := &sessionutil.Session{
		ServerID: 100,
		Address:  "localhost",
	}

	pcm.AddProxyClient(session)

	pcm.InvalidateCollectionMetaCache(ctx, nil)
}

func TestProxyClientManager_ReleaseDQLMessageStream(t *testing.T) {
	Params.Init()
	ctx := context.Background()

	core, err := NewCore(ctx, nil)
	assert.Nil(t, err)
	cli, err := clientv3.New(clientv3.Config{Endpoints: Params.EtcdEndpoints})
	assert.Nil(t, err)
	core.etcdCli = cli

	pcm := newProxyClientManager(core)

	pcm.ReleaseDQLMessageStream(ctx, nil)

	core.SetNewProxyClient(
		func(se *sessionutil.Session) (types.Proxy, error) {
			return nil, nil
		},
	)

	session := &sessionutil.Session{
		ServerID: 100,
		Address:  "localhost",
	}

	pcm.AddProxyClient(session)

	assert.Panics(t, func() { pcm.ReleaseDQLMessageStream(ctx, nil) })
}