// 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 grpcquerycoord

import (
	"context"
	"os"
	"testing"

	"github.com/cockroachdb/errors"

	"github.com/milvus-io/milvus/internal/types"
	"github.com/milvus-io/milvus/internal/util/paramtable"

	"github.com/milvus-io/milvus-proto/go-api/commonpb"
	"github.com/milvus-io/milvus-proto/go-api/milvuspb"
	"github.com/milvus-io/milvus/internal/proto/internalpb"
	"github.com/milvus-io/milvus/internal/proto/querypb"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"
)

// /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
type MockRootCoord struct {
	types.RootCoord
	initErr  error
	startErr error
	regErr   error
	stopErr  error
	stateErr commonpb.ErrorCode
}

func (m *MockRootCoord) Init() error {
	return m.initErr
}

func (m *MockRootCoord) Start() error {
	return m.startErr
}

func (m *MockRootCoord) Stop() error {
	return m.stopErr
}

func (m *MockRootCoord) Register() error {
	return m.regErr
}

func (m *MockRootCoord) GetComponentStates(ctx context.Context) (*milvuspb.ComponentStates, error) {
	return &milvuspb.ComponentStates{
		State:  &milvuspb.ComponentInfo{StateCode: commonpb.StateCode_Healthy},
		Status: &commonpb.Status{ErrorCode: m.stateErr},
	}, nil
}

// /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
type MockDataCoord struct {
	types.DataCoord
	initErr  error
	startErr error
	stopErr  error
	regErr   error
	stateErr commonpb.ErrorCode
}

func (m *MockDataCoord) Init() error {
	return m.initErr
}

func (m *MockDataCoord) Start() error {
	return m.startErr
}

func (m *MockDataCoord) Stop() error {
	return m.stopErr
}

func (m *MockDataCoord) Register() error {
	return m.regErr
}

func (m *MockDataCoord) GetComponentStates(ctx context.Context) (*milvuspb.ComponentStates, error) {
	return &milvuspb.ComponentStates{
		State:  &milvuspb.ComponentInfo{StateCode: commonpb.StateCode_Healthy},
		Status: &commonpb.Status{ErrorCode: m.stateErr},
	}, nil
}

// /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
func TestMain(m *testing.M) {
	paramtable.Init()
	code := m.Run()
	os.Exit(code)
}

func Test_NewServer(t *testing.T) {
	ctx := context.Background()
	server, err := NewServer(ctx, nil)
	assert.Nil(t, err)
	assert.NotNil(t, server)

	mdc := &MockDataCoord{
		stateErr: commonpb.ErrorCode_Success,
	}

	mrc := &MockRootCoord{
		stateErr: commonpb.ErrorCode_Success,
	}

	mqc := getQueryCoord()
	successStatus := &commonpb.Status{
		ErrorCode: commonpb.ErrorCode_Success,
	}

	t.Run("Run", func(t *testing.T) {
		server.queryCoord = mqc
		server.dataCoord = mdc
		server.rootCoord = mrc

		err = server.Run()
		assert.Nil(t, err)
	})

	t.Run("GetComponentStates", func(t *testing.T) {
		mqc.EXPECT().GetComponentStates(mock.Anything).Return(&milvuspb.ComponentStates{
			State: &milvuspb.ComponentInfo{
				NodeID:    0,
				Role:      "MockQueryCoord",
				StateCode: commonpb.StateCode_Healthy,
			},
			Status: successStatus,
		}, nil)

		req := &milvuspb.GetComponentStatesRequest{}
		states, err := server.GetComponentStates(ctx, req)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.StateCode_Healthy, states.State.StateCode)
	})

	t.Run("GetStatisticsChannel", func(t *testing.T) {
		req := &internalpb.GetStatisticsChannelRequest{}
		mqc.EXPECT().GetStatisticsChannel(mock.Anything).Return(
			&milvuspb.StringResponse{
				Status: successStatus,
			}, nil,
		)
		resp, err := server.GetStatisticsChannel(ctx, req)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.Status.ErrorCode)
	})

	t.Run("GetTimeTickChannel", func(t *testing.T) {
		req := &internalpb.GetTimeTickChannelRequest{}
		mqc.EXPECT().GetTimeTickChannel(mock.Anything).Return(
			&milvuspb.StringResponse{
				Status: successStatus,
			}, nil,
		)
		resp, err := server.GetTimeTickChannel(ctx, req)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.Status.ErrorCode)
	})

	t.Run("ShowCollections", func(t *testing.T) {
		mqc.EXPECT().ShowCollections(mock.Anything, mock.Anything).Return(
			&querypb.ShowCollectionsResponse{
				Status: successStatus,
			}, nil,
		)
		resp, err := server.ShowCollections(ctx, nil)
		assert.Nil(t, err)
		assert.NotNil(t, resp)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.Status.ErrorCode)
	})

	t.Run("LoadCollection", func(t *testing.T) {
		mqc.EXPECT().LoadCollection(mock.Anything, mock.Anything).Return(successStatus, nil)
		resp, err := server.LoadCollection(ctx, nil)
		assert.Nil(t, err)
		assert.NotNil(t, resp)
	})

	t.Run("ReleaseCollection", func(t *testing.T) {
		mqc.EXPECT().ReleaseCollection(mock.Anything, mock.Anything).Return(successStatus, nil)
		resp, err := server.ReleaseCollection(ctx, nil)
		assert.Nil(t, err)
		assert.NotNil(t, resp)
	})

	t.Run("ShowPartitions", func(t *testing.T) {
		mqc.EXPECT().ShowPartitions(mock.Anything, mock.Anything).Return(&querypb.ShowPartitionsResponse{Status: successStatus}, nil)
		resp, err := server.ShowPartitions(ctx, nil)
		assert.Nil(t, err)
		assert.NotNil(t, resp)
	})
	t.Run("GetPartitionStates", func(t *testing.T) {
		mqc.EXPECT().GetPartitionStates(mock.Anything, mock.Anything).Return(&querypb.GetPartitionStatesResponse{Status: successStatus}, nil)
		resp, err := server.GetPartitionStates(ctx, nil)
		assert.Nil(t, err)
		assert.NotNil(t, resp)
	})

	t.Run("LoadPartitions", func(t *testing.T) {
		mqc.EXPECT().LoadPartitions(mock.Anything, mock.Anything).Return(successStatus, nil)
		resp, err := server.LoadPartitions(ctx, nil)
		assert.Nil(t, err)
		assert.NotNil(t, resp)
	})

	t.Run("ReleasePartitions", func(t *testing.T) {
		mqc.EXPECT().ReleasePartitions(mock.Anything, mock.Anything).Return(successStatus, nil)
		resp, err := server.ReleasePartitions(ctx, nil)
		assert.Nil(t, err)
		assert.NotNil(t, resp)
	})

	t.Run("GetTimeTickChannel", func(t *testing.T) {
		mqc.EXPECT().GetTimeTickChannel(mock.Anything).Return(&milvuspb.StringResponse{Status: successStatus}, nil)
		resp, err := server.GetTimeTickChannel(ctx, nil)
		assert.Nil(t, err)
		assert.NotNil(t, resp)
	})

	t.Run("GetSegmentInfo", func(t *testing.T) {
		req := &querypb.GetSegmentInfoRequest{}
		mqc.EXPECT().GetSegmentInfo(mock.Anything, req).Return(&querypb.GetSegmentInfoResponse{Status: successStatus}, nil)
		resp, err := server.GetSegmentInfo(ctx, req)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.Status.ErrorCode)
	})

	t.Run("LoadBalance", func(t *testing.T) {
		req := &querypb.LoadBalanceRequest{}
		mqc.EXPECT().LoadBalance(mock.Anything, req).Return(successStatus, nil)
		resp, err := server.LoadBalance(ctx, req)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.ErrorCode)
	})

	t.Run("GetMetrics", func(t *testing.T) {
		req := &milvuspb.GetMetricsRequest{
			Request: "",
		}
		mqc.EXPECT().GetMetrics(mock.Anything, req).Return(&milvuspb.GetMetricsResponse{Status: successStatus}, nil)
		resp, err := server.GetMetrics(ctx, req)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.Status.ErrorCode)
	})

	t.Run("CheckHealth", func(t *testing.T) {
		mqc.EXPECT().CheckHealth(mock.Anything, mock.Anything).Return(
			&milvuspb.CheckHealthResponse{Status: successStatus, IsHealthy: true}, nil)
		ret, err := server.CheckHealth(ctx, nil)
		assert.Nil(t, err)
		assert.Equal(t, true, ret.IsHealthy)
	})

	t.Run("CreateResourceGroup", func(t *testing.T) {
		mqc.EXPECT().CreateResourceGroup(mock.Anything, mock.Anything).Return(successStatus, nil)
		resp, err := server.CreateResourceGroup(ctx, nil)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.ErrorCode)
	})

	t.Run("DropResourceGroup", func(t *testing.T) {
		mqc.EXPECT().DropResourceGroup(mock.Anything, mock.Anything).Return(successStatus, nil)
		resp, err := server.DropResourceGroup(ctx, nil)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.ErrorCode)
	})

	t.Run("TransferNode", func(t *testing.T) {
		mqc.EXPECT().TransferNode(mock.Anything, mock.Anything).Return(successStatus, nil)
		resp, err := server.TransferNode(ctx, nil)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.ErrorCode)
	})

	t.Run("TransferReplica", func(t *testing.T) {
		mqc.EXPECT().TransferReplica(mock.Anything, mock.Anything).Return(successStatus, nil)
		resp, err := server.TransferReplica(ctx, nil)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.ErrorCode)
	})

	t.Run("ListResourceGroups", func(t *testing.T) {
		req := &milvuspb.ListResourceGroupsRequest{}
		mqc.EXPECT().ListResourceGroups(mock.Anything, req).Return(&milvuspb.ListResourceGroupsResponse{Status: successStatus}, nil)
		resp, err := server.ListResourceGroups(ctx, req)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.Status.ErrorCode)
	})

	t.Run("DescribeResourceGroup", func(t *testing.T) {
		mqc.EXPECT().DescribeResourceGroup(mock.Anything, mock.Anything).Return(&querypb.DescribeResourceGroupResponse{Status: successStatus}, nil)
		resp, err := server.DescribeResourceGroup(ctx, nil)
		assert.Nil(t, err)
		assert.Equal(t, commonpb.ErrorCode_Success, resp.Status.ErrorCode)
	})

	err = server.Stop()
	assert.Nil(t, err)
}

// This test will no longer return error immediately.
func TestServer_Run1(t *testing.T) {
	t.Skip()
	ctx := context.Background()
	server, err := NewServer(ctx, nil)
	assert.Nil(t, err)
	assert.NotNil(t, server)

	mqc := getQueryCoord()
	mqc.EXPECT().Start().Return(errors.New("error"))
	server.queryCoord = mqc
	err = server.Run()
	assert.Error(t, err)

	err = server.Stop()
	assert.Nil(t, err)
}

func TestServer_Run2(t *testing.T) {
	ctx := context.Background()
	server, err := NewServer(ctx, nil)
	assert.Nil(t, err)
	assert.NotNil(t, server)

	server.queryCoord = getQueryCoord()
	server.rootCoord = &MockRootCoord{
		initErr: errors.New("error"),
	}
	assert.Panics(t, func() { server.Run() })
	err = server.Stop()
	assert.Nil(t, err)
}

func getQueryCoord() *types.MockQueryCoord {
	mqc := &types.MockQueryCoord{}
	mqc.EXPECT().Init().Return(nil)
	mqc.EXPECT().SetEtcdClient(mock.Anything)
	mqc.EXPECT().SetAddress(mock.Anything)
	mqc.EXPECT().SetRootCoord(mock.Anything).Return(nil)
	mqc.EXPECT().SetDataCoord(mock.Anything).Return(nil)
	mqc.EXPECT().UpdateStateCode(mock.Anything)
	mqc.EXPECT().Register().Return(nil)
	mqc.EXPECT().Start().Return(nil)
	mqc.EXPECT().Stop().Return(nil)

	return mqc
}

func TestServer_Run3(t *testing.T) {
	ctx := context.Background()
	server, err := NewServer(ctx, nil)
	assert.Nil(t, err)
	assert.NotNil(t, server)
	server.queryCoord = getQueryCoord()
	server.rootCoord = &MockRootCoord{
		startErr: errors.New("error"),
	}
	assert.Panics(t, func() { server.Run() })
	err = server.Stop()
	assert.Nil(t, err)

}

func TestServer_Run4(t *testing.T) {
	ctx := context.Background()
	server, err := NewServer(ctx, nil)
	assert.Nil(t, err)
	assert.NotNil(t, server)

	server.queryCoord = getQueryCoord()
	server.rootCoord = &MockRootCoord{}
	server.dataCoord = &MockDataCoord{
		initErr: errors.New("error"),
	}
	assert.Panics(t, func() { server.Run() })
	err = server.Stop()
	assert.Nil(t, err)
}

func TestServer_Run5(t *testing.T) {
	ctx := context.Background()
	server, err := NewServer(ctx, nil)
	assert.Nil(t, err)
	assert.NotNil(t, server)

	server.queryCoord = getQueryCoord()
	server.rootCoord = &MockRootCoord{}
	server.dataCoord = &MockDataCoord{
		startErr: errors.New("error"),
	}
	assert.Panics(t, func() { server.Run() })
	err = server.Stop()
	assert.Nil(t, err)
}