package reader

import (
	"encoding/json"
	"errors"
	"fmt"
	log "github.com/apache/pulsar/pulsar-client-go/logutil"
	"os"
	"strconv"
	"time"
)

// Function `GetSegmentByEntityId` should return entityIDs, timestamps and segmentIDs
func (node *QueryNode) GetKey2Segments() (*[]int64, *[]uint64, *[]int64) {
	var entityIDs = make([]int64, 0)
	var timestamps = make([]uint64, 0)
	var segmentIDs = make([]int64, 0)

	var key2SegMsg = node.messageClient.Key2SegMsg
	for _, msg := range key2SegMsg {
		if msg.SegmentId == nil {
			segmentIDs = append(segmentIDs, -1)
			entityIDs = append(entityIDs, msg.Uid)
			timestamps = append(timestamps, msg.Timestamp)
		} else {
			for _, segmentID := range msg.SegmentId {
				segmentIDs = append(segmentIDs, segmentID)
				entityIDs = append(entityIDs, msg.Uid)
				timestamps = append(timestamps, msg.Timestamp)
			}
		}
	}

	return &entityIDs, &timestamps, &segmentIDs
}

func (node *QueryNode) GetCollectionByID(collectionID uint64) *Collection {
	for _, collection := range node.Collections {
		if collection.CollectionID == collectionID {
			return collection
		}
	}

	return nil
}

func (node *QueryNode) GetCollectionByCollectionName(collectionName string) (*Collection, error) {
	for _, collection := range node.Collections {
		if collection.CollectionName == collectionName {
			return collection, nil
		}
	}

	return nil, errors.New("Cannot found collection: " + collectionName)
}

func (node *QueryNode) GetSegmentBySegmentID(segmentID int64) (*Segment, error) {
	targetSegment := node.SegmentsMap[segmentID]

	if targetSegment == nil {
		return nil, errors.New("cannot found segment with id = " + strconv.FormatInt(segmentID, 10))
	}

	return targetSegment, nil
}

func (c *Collection) GetPartitionByName(partitionName string) (partition *Partition) {
	for _, partition := range c.Partitions {
		if partition.PartitionName == partitionName {
			return partition
		}
	}
	return nil
	// TODO: remove from c.Partitions
}

func (node *QueryNode) QueryLog(length int) {
	node.msgCounter.InsertCounter += int64(length)
	timeNow := time.Now()
	duration := timeNow.Sub(node.msgCounter.InsertTime)
	speed := float64(length) / duration.Seconds()

	insertLog := InsertLog{
		MsgLength:              length,
		DurationInMilliseconds: duration.Milliseconds(),
		InsertTime:             timeNow,
		NumSince:               node.msgCounter.InsertCounter,
		Speed:                  speed,
	}

	node.InsertLogs = append(node.InsertLogs, insertLog)
	node.msgCounter.InsertTime = timeNow
}

func (node *QueryNode) WriteQueryLog() {
	f, err := os.OpenFile("/tmp/query_node_insert.txt", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		log.Fatal(err)
	}

	// write logs
	for _, insertLog := range node.InsertLogs {
		insertLogJson, err := json.Marshal(&insertLog)
		if err != nil {
			log.Fatal(err)
		}

		writeString := string(insertLogJson) + "\n"
		fmt.Println(writeString)

		_, err2 := f.WriteString(writeString)
		if err2 != nil {
			log.Fatal(err2)
		}
	}

	// reset InsertLogs buffer
	node.InsertLogs = make([]InsertLog, 0)

	err = f.Close()
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println("write log done")
}