// 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 proxy

import (
	"context"
	"sync/atomic"

	"github.com/milvus-io/milvus/internal/proto/commonpb"
	"github.com/milvus-io/milvus/internal/proto/datapb"
	"github.com/milvus-io/milvus/internal/proto/internalpb"
	"github.com/milvus-io/milvus/internal/proto/milvuspb"
	"github.com/milvus-io/milvus/internal/util/funcutil"
	"github.com/milvus-io/milvus/internal/util/typeutil"
	"github.com/milvus-io/milvus/internal/util/uniquegenerator"
)

type DataCoordMock struct {
	nodeID  typeutil.UniqueID
	address string

	state atomic.Value // internal.StateCode

	getMetricsFunc getMetricsFuncType

	statisticsChannel string
	timeTickChannel   string
}

func (coord *DataCoordMock) updateState(state internalpb.StateCode) {
	coord.state.Store(state)
}

func (coord *DataCoordMock) getState() internalpb.StateCode {
	return coord.state.Load().(internalpb.StateCode)
}

func (coord *DataCoordMock) healthy() bool {
	return coord.getState() == internalpb.StateCode_Healthy
}

func (coord *DataCoordMock) Init() error {
	coord.updateState(internalpb.StateCode_Initializing)
	return nil
}

func (coord *DataCoordMock) Start() error {
	defer coord.updateState(internalpb.StateCode_Healthy)

	return nil
}

func (coord *DataCoordMock) Stop() error {
	defer coord.updateState(internalpb.StateCode_Abnormal)

	return nil
}

func (coord *DataCoordMock) GetComponentStates(ctx context.Context) (*internalpb.ComponentStates, error) {
	return &internalpb.ComponentStates{
		State: &internalpb.ComponentInfo{
			NodeID:    coord.nodeID,
			Role:      typeutil.DataCoordRole,
			StateCode: coord.getState(),
			ExtraInfo: nil,
		},
		SubcomponentStates: nil,
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_Success,
			Reason:    "",
		},
	}, nil
}

func (coord *DataCoordMock) GetStatisticsChannel(ctx context.Context) (*milvuspb.StringResponse, error) {
	return &milvuspb.StringResponse{
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_Success,
			Reason:    "",
		},
		Value: coord.statisticsChannel,
	}, nil
}

func (coord *DataCoordMock) Register() error {
	return nil
}

func (coord *DataCoordMock) GetTimeTickChannel(ctx context.Context) (*milvuspb.StringResponse, error) {
	return &milvuspb.StringResponse{
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_Success,
			Reason:    "",
		},
		Value: coord.timeTickChannel,
	}, nil
}

func (coord *DataCoordMock) Flush(ctx context.Context, req *datapb.FlushRequest) (*datapb.FlushResponse, error) {
	panic("implement me")
}

func (coord *DataCoordMock) AssignSegmentID(ctx context.Context, req *datapb.AssignSegmentIDRequest) (*datapb.AssignSegmentIDResponse, error) {
	panic("implement me")
}

func (coord *DataCoordMock) GetSegmentStates(ctx context.Context, req *datapb.GetSegmentStatesRequest) (*datapb.GetSegmentStatesResponse, error) {
	panic("implement me")
}

func (coord *DataCoordMock) GetInsertBinlogPaths(ctx context.Context, req *datapb.GetInsertBinlogPathsRequest) (*datapb.GetInsertBinlogPathsResponse, error) {
	panic("implement me")
}

func (coord *DataCoordMock) GetSegmentInfoChannel(ctx context.Context) (*milvuspb.StringResponse, error) {
	panic("implement me")
}

func (coord *DataCoordMock) GetCollectionStatistics(ctx context.Context, req *datapb.GetCollectionStatisticsRequest) (*datapb.GetCollectionStatisticsResponse, error) {
	panic("implement me")
}

func (coord *DataCoordMock) GetPartitionStatistics(ctx context.Context, req *datapb.GetPartitionStatisticsRequest) (*datapb.GetPartitionStatisticsResponse, error) {
	panic("implement me")
}

func (coord *DataCoordMock) GetSegmentInfo(ctx context.Context, req *datapb.GetSegmentInfoRequest) (*datapb.GetSegmentInfoResponse, error) {
	panic("implement me")
}

func (coord *DataCoordMock) GetRecoveryInfo(ctx context.Context, req *datapb.GetRecoveryInfoRequest) (*datapb.GetRecoveryInfoResponse, error) {
	panic("implement me")
}

func (coord *DataCoordMock) SaveBinlogPaths(ctx context.Context, req *datapb.SaveBinlogPathsRequest) (*commonpb.Status, error) {
	panic("implement me")
}

func (coord *DataCoordMock) GetFlushedSegments(ctx context.Context, req *datapb.GetFlushedSegmentsRequest) (*datapb.GetFlushedSegmentsResponse, error) {
	panic("implement me")
}

func (coord *DataCoordMock) GetMetrics(ctx context.Context, req *milvuspb.GetMetricsRequest) (*milvuspb.GetMetricsResponse, error) {
	if !coord.healthy() {
		return &milvuspb.GetMetricsResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UnexpectedError,
				Reason:    "unhealthy",
			},
		}, nil
	}

	if coord.getMetricsFunc != nil {
		return coord.getMetricsFunc(ctx, req)
	}

	return &milvuspb.GetMetricsResponse{
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_UnexpectedError,
			Reason:    "not implemented",
		},
		Response:      "",
		ComponentName: "",
	}, nil
}

func (coord *DataCoordMock) CompleteCompaction(ctx context.Context, req *datapb.CompactionResult) (*commonpb.Status, error) {
	return &commonpb.Status{}, nil
}

func (coord *DataCoordMock) ManualCompaction(ctx context.Context, req *milvuspb.ManualCompactionRequest) (*milvuspb.ManualCompactionResponse, error) {
	return &milvuspb.ManualCompactionResponse{}, nil
}

func (coord *DataCoordMock) GetCompactionState(ctx context.Context, req *milvuspb.GetCompactionStateRequest) (*milvuspb.GetCompactionStateResponse, error) {
	return &milvuspb.GetCompactionStateResponse{}, nil
}

func (coord *DataCoordMock) GetCompactionStateWithPlans(ctx context.Context, req *milvuspb.GetCompactionPlansRequest) (*milvuspb.GetCompactionPlansResponse, error) {
	return &milvuspb.GetCompactionPlansResponse{}, nil
}

func (coord *DataCoordMock) WatchChannels(ctx context.Context, req *datapb.WatchChannelsRequest) (*datapb.WatchChannelsResponse, error) {
	return &datapb.WatchChannelsResponse{}, nil
}

func NewDataCoordMock() *DataCoordMock {
	return &DataCoordMock{
		nodeID:            typeutil.UniqueID(uniquegenerator.GetUniqueIntGeneratorIns().GetInt()),
		address:           funcutil.GenRandomStr(), // random address
		state:             atomic.Value{},
		getMetricsFunc:    nil,
		statisticsChannel: funcutil.GenRandomStr(),
		timeTickChannel:   funcutil.GenRandomStr(),
	}
}