package proxyservice

import (
	"context"
	"io/ioutil"
	"log"
	"os"
	"path"
	"runtime"
	"time"

	"github.com/zilliztech/milvus-distributed/internal/msgstream/util"

	"github.com/zilliztech/milvus-distributed/internal/msgstream/pulsarms"

	"github.com/zilliztech/milvus-distributed/internal/proto/commonpb"

	"github.com/zilliztech/milvus-distributed/internal/proto/milvuspb"

	"github.com/zilliztech/milvus-distributed/internal/proto/internalpb2"
	"github.com/zilliztech/milvus-distributed/internal/proto/proxypb"
)

const (
	timeoutInterval      = time.Second * 10
	StartParamsKey       = "START_PARAMS"
	ChannelYamlContent   = "advanced/channel.yaml"
	CommonYamlContent    = "advanced/common.yaml"
	DataNodeYamlContent  = "advanced/data_node.yaml"
	MasterYamlContent    = "advanced/master.yaml"
	ProxyNodeYamlContent = "advanced/proxy_node.yaml"
	QueryNodeYamlContent = "advanced/query_node.yaml"
	WriteNodeYamlContent = "advanced/write_node.yaml"
	MilvusYamlContent    = "milvus.yaml"
)

func (s *ServiceImpl) fillNodeInitParams() error {
	s.nodeStartParams = make([]*commonpb.KeyValuePair, 0)

	getConfigContentByName := func(fileName string) []byte {
		_, fpath, _, _ := runtime.Caller(0)
		configFile := path.Dir(fpath) + "/../../../configs/" + fileName
		_, err := os.Stat(configFile)
		if os.IsNotExist(err) {
			runPath, err := os.Getwd()
			if err != nil {
				panic(err)
			}
			configFile = runPath + "/configs/" + fileName
		}
		data, err := ioutil.ReadFile(configFile)
		if err != nil {
			panic(err)
		}
		return data
	}

	channelYamlContent := getConfigContentByName(ChannelYamlContent)
	commonYamlContent := getConfigContentByName(CommonYamlContent)
	dataNodeYamlContent := getConfigContentByName(DataNodeYamlContent)
	masterYamlContent := getConfigContentByName(MasterYamlContent)
	proxyNodeYamlContent := getConfigContentByName(ProxyNodeYamlContent)
	queryNodeYamlContent := getConfigContentByName(QueryNodeYamlContent)
	writeNodeYamlContent := getConfigContentByName(WriteNodeYamlContent)
	milvusYamlContent := getConfigContentByName(MilvusYamlContent)

	var allContent []byte
	allContent = append(allContent, channelYamlContent...)
	allContent = append(allContent, commonYamlContent...)
	allContent = append(allContent, dataNodeYamlContent...)
	allContent = append(allContent, masterYamlContent...)
	allContent = append(allContent, proxyNodeYamlContent...)
	allContent = append(allContent, queryNodeYamlContent...)
	allContent = append(allContent, writeNodeYamlContent...)
	allContent = append(allContent, milvusYamlContent...)

	s.nodeStartParams = append(s.nodeStartParams, &commonpb.KeyValuePair{
		Key:   StartParamsKey,
		Value: string(allContent),
	})

	return nil
}

func (s *ServiceImpl) Init() error {

	err := s.fillNodeInitParams()
	if err != nil {
		return err
	}

	serviceTimeTickMsgStream := pulsarms.NewPulsarTtMsgStream(s.ctx, 1024)
	serviceTimeTickMsgStream.SetPulsarClient(Params.PulsarAddress)
	serviceTimeTickMsgStream.CreatePulsarProducers([]string{Params.ServiceTimeTickChannel})

	nodeTimeTickMsgStream := pulsarms.NewPulsarMsgStream(s.ctx, 1024)
	nodeTimeTickMsgStream.SetPulsarClient(Params.PulsarAddress)
	nodeTimeTickMsgStream.CreatePulsarConsumers(Params.NodeTimeTickChannel,
		"proxyservicesub", // TODO: add config
		util.NewUnmarshalDispatcher(),
		1024)

	ttBarrier := newSoftTimeTickBarrier(s.ctx, nodeTimeTickMsgStream, []UniqueID{0}, 10)
	s.tick = newTimeTick(s.ctx, ttBarrier, serviceTimeTickMsgStream)

	s.stateCode = internalpb2.StateCode_HEALTHY

	return nil
}

func (s *ServiceImpl) Start() error {
	s.sched.Start()
	return s.tick.Start()
}

func (s *ServiceImpl) Stop() error {
	s.sched.Close()
	s.tick.Close()
	return nil
}

func (s *ServiceImpl) GetComponentStates() (*internalpb2.ComponentStates, error) {
	stateInfo := &internalpb2.ComponentInfo{
		NodeID:    UniqueID(0),
		Role:      "ProxyService",
		StateCode: s.stateCode,
	}

	ret := &internalpb2.ComponentStates{
		State:              stateInfo,
		SubcomponentStates: nil, // todo add subcomponents states
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_SUCCESS,
		},
	}
	return ret, nil
}

func (s *ServiceImpl) UpdateStateCode(code internalpb2.StateCode) {
	s.stateCode = code
}

func (s *ServiceImpl) GetTimeTickChannel() (string, error) {
	return Params.ServiceTimeTickChannel, nil
}

func (s *ServiceImpl) GetStatisticsChannel() (string, error) {
	panic("implement me")
}

func (s *ServiceImpl) RegisterLink() (*milvuspb.RegisterLinkResponse, error) {
	log.Println("register link")
	ctx, cancel := context.WithTimeout(s.ctx, timeoutInterval)
	defer cancel()

	t := &RegisterLinkTask{
		Condition: NewTaskCondition(ctx),
		nodeInfos: s.nodeInfos,
	}

	var err error

	err = s.sched.RegisterLinkTaskQueue.Enqueue(t)
	if err != nil {
		return &milvuspb.RegisterLinkResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    err.Error(),
			},
			Address: nil,
		}, nil
	}

	err = t.WaitToFinish()
	if err != nil {
		return &milvuspb.RegisterLinkResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    err.Error(),
			},
			Address: nil,
		}, nil
	}

	return t.response, nil
}

func (s *ServiceImpl) RegisterNode(request *proxypb.RegisterNodeRequest) (*proxypb.RegisterNodeResponse, error) {
	log.Println("RegisterNode: ", request)
	ctx, cancel := context.WithTimeout(s.ctx, timeoutInterval)
	defer cancel()

	t := &RegisterNodeTask{
		request:     request,
		startParams: s.nodeStartParams,
		Condition:   NewTaskCondition(ctx),
		allocator:   s.allocator,
		nodeInfos:   s.nodeInfos,
	}

	var err error

	err = s.sched.RegisterNodeTaskQueue.Enqueue(t)
	if err != nil {
		return &proxypb.RegisterNodeResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    err.Error(),
			},
			InitParams: nil,
		}, nil
	}

	err = t.WaitToFinish()
	if err != nil {
		return &proxypb.RegisterNodeResponse{
			Status: &commonpb.Status{
				ErrorCode: commonpb.ErrorCode_UNEXPECTED_ERROR,
				Reason:    err.Error(),
			},
			InitParams: nil,
		}, nil
	}

	return t.response, nil
}

func (s *ServiceImpl) InvalidateCollectionMetaCache(request *proxypb.InvalidateCollMetaCacheRequest) error {
	log.Println("InvalidateCollectionMetaCache")
	ctx, cancel := context.WithTimeout(s.ctx, timeoutInterval)
	defer cancel()

	t := &InvalidateCollectionMetaCacheTask{
		request:   request,
		Condition: NewTaskCondition(ctx),
	}

	var err error

	err = s.sched.RegisterNodeTaskQueue.Enqueue(t)
	if err != nil {
		return err
	}

	err = t.WaitToFinish()
	if err != nil {
		return err
	}

	return nil
}