package search

import (
	"fmt"
	"io"
	"log"
	"net"
	"strings"
	"time"

	"xiaoniaokuaiyan.com/xiaoniao/config"

	"github.com/blevesearch/bleve"
	_ "github.com/blevesearch/bleve/search/highlight/highlighter/html"
	bq "github.com/blevesearch/bleve/search/query"
	"gopkg.in/guregu/null.v3"
	"gopkg.in/redis.v2"
	_ "xiaoniaokuaiyan.com/xiaoniao/search/analyzer"
	"xiaoniaokuaiyan.com/xiaoniao/util"
)

var engine bleve.Index

type SearchResult struct {
	Total     uint64        `json:"total"`
	PageIndex int           `json:"pageIndex"`
	Hits      []interface{} `json:"hits"`
	Size      int           `json:"size"`
	Took      time.Duration `json:"took"`
}

type HitItem struct {
	Locations interface{}            `json:"-"`
	Fragments interface{}            `json:"-"`
	Fields    map[string]interface{} `json:"fields"`
}

type QueryParam struct {
	Text        string   `json:"text"`
	CityId      uint     `json:"cityId"`
	PageIndex   int      `json:"pageIndex"`
	Size        int      `json"size"`
	IsHighlight bool     `json:"isHighlight"`
	CateIds     []string `json:"cate_ids"`
	SortBy      string   `json:"sort_by"`
	IsSale      bool     `json:"is_sale"`
	IsZFB       bool     `json:"is_zfb"`
}

const DEFAULT_PAGE_SIZE = 10

func Query(param *QueryParam) (*SearchResult, error) {
	//if param.CityId <= 0 {
	//	return nil, fmt.Errorf("param city id is invalid, passed %v", param.CityId)
	//}
	text := strings.ToLower(param.Text)
	text = strings.Trim(text, " ")
	var (
		textQ bq.Query
	)
	if text != "" {
		query := bleve.NewQueryStringQuery(fmt.Sprintf("name:%s items:%s keywords:%s", text, text, text))
		pyQuery := bleve.NewRegexpQuery(".*" + text + ".*")
		pyQuery.SetField("py")
		jpQuery := bleve.NewRegexpQuery(".*" + text + ".*")
		jpQuery.SetField("jp")
		tQ := bleve.NewDisjunctionQuery(
			query,
			jpQuery,
			pyQuery,
		)
		tQ.SetMin(1)
		textQ = tQ
	} else {
		textQ = bleve.NewMatchAllQuery()
	}
	var q bq.Query = textQ
	cityQ := bleve.NewTermQuery(fmt.Sprintf("%d", param.CityId))
	cityQ.SetField("cityIds")
	var conjunctionQuery *bq.ConjunctionQuery = bleve.NewConjunctionQuery(textQ)
	if param.CityId > 0 {
		conjunctionQuery.AddQuery(cityQ)
	}
	if len(param.CateIds) > 0 {
		cateQ := bleve.NewTermQuery(param.CateIds[0])
		cateQ.SetField("cates")
		conjunctionQuery.AddQuery(cateQ)
	}
	if param.IsSale {
		saleQ := bleve.NewBoolFieldQuery(true)
		saleQ.SetField("is_sale")
		conjunctionQuery.AddQuery(saleQ)
	}
	if param.IsZFB {
		zfbQ := bleve.NewBoolFieldQuery(true)
		zfbQ.SetField("is_zfb")
		conjunctionQuery.AddQuery(zfbQ)
	}
	if len(conjunctionQuery.Conjuncts) > 0 {
		q = conjunctionQuery
	}
	request := bleve.NewSearchRequest(q)
	if param.SortBy != "" {
		request.SortBy([]string{param.SortBy})
	}
	//request.Fields = []string{"*"}
	if param.IsHighlight {
		request.Highlight = bleve.NewHighlightWithStyle("custom")
		request.Highlight.Fields = []string{"name", "items"}
	}
	request.Fields = []string{"id", "name", "price", "picture", "isRecommend", "items", "cityIds", "market_price", "zfb_price"}
	request.From = (param.PageIndex - 1) * param.Size
	if param.Size <= 0 {
		param.Size = DEFAULT_PAGE_SIZE
	}
	request.Size = param.Size
	result, err := engine.Search(request)
	if err != nil {
		return nil, err
	}
	searchResult := &SearchResult{
		Total:     result.Total,
		PageIndex: param.PageIndex,
		Size:      param.Size,
		Took:      result.Took,
	}
	for _, hit := range result.Hits {
		hitem := &HitItem{
			Locations: hit.Locations,
			Fragments: hit.Fragments,
			Fields:    hit.Fields,
		}
		//替换搜索匹配项
		for k, v := range hit.Fragments {
			hitem.Fields[k] = v
		}
		if param.IsZFB {
			hitem.Fields["price"] = hitem.Fields["zfb_price"]
		}
		searchResult.Hits = append(searchResult.Hits, hitem)
	}
	return searchResult, nil
}

func GetSearchTips(text string, cityId int, isZFB bool) ([]TipItem, error) {
	text = strings.ToLower(text)
	query := bleve.NewQueryStringQuery(fmt.Sprintf("name:%s items:%s keywords:%s", text, text, text))
	cityQ := bleve.NewTermQuery(fmt.Sprintf("%d", cityId))
	cityQ.SetField("cityIds")
	pyQuery := bleve.NewRegexpQuery(".*" + text + ".*")
	pyQuery.SetField("py")
	jpQuery := bleve.NewRegexpQuery(".*" + text + ".*")
	jpQuery.SetField("jp")
	textQ := bleve.NewDisjunctionQuery(
		query,
		jpQuery,
		pyQuery,
	)
	zfbQ := bleve.NewBoolFieldQuery(true)
	zfbQ.SetField("is_zfb")

	//var q bq.Query
	//if cityId > 0 {
	//	q = bleve.NewConjunctionQuery(
	//		textQ,
	//		cityQ,
	//	)
	//} else {
	//	q = textQ
	//}
	q := bleve.NewConjunctionQuery(textQ)
	if cityId > 0 {
		q.AddQuery(cityQ)
	}
	if isZFB {
		q.AddQuery(zfbQ)
	}
	request := bleve.NewSearchRequest(q)
	request.Fields = []string{"name", "items"}
	request.Size = 10
	result, err := engine.Search(request)
	if err != nil {
		return nil, err
	}
	tipList := []TipItem{}
	for _, hit := range result.Hits {
		//fmt.Println(hit.Fields["name"])

		tipList = append(tipList, TipItem{hit.Fields["name"]})
	}
	return tipList, nil

}

type TipItem struct {
	Tip interface{} `json:"tip"`
}

type productDB struct {
	Id           string      `db:"id" json:"id"`
	Name         string      `db:"name" json:"name"`
	Price        int         `db:"price" json:"price"`
	IsRecommend  int         `db:"is_recommend" json:"isRecommend"`
	Keywords     string      `db:"-" json:"keywords"`
	TKeywords    null.String `db:"keywords" json:"tkeywords"`
	Picture      string      `db:"picture" json:"picture"`
	Items        string      `db:"-" json:"items"`
	CityIds      []string    `db:"-" json:"cityIds"`
	Pinyin       string      `db:"-" json:"py"`
	JP           string      `db:"-" json:"jp"`
	Cates        []string    `db:"-" json:"cates"`
	SaleNum      int         `db:"sale_num" json:"sale_num"`
	SortNo       int         `db:"sort_no" json:"sort_no"`
	CreatedAt    string      `db:"created_at" json:"created_at"`
	PutawayTime  string      `db:"-" json:"putaway_time"`
	TPutawayTime null.String `db:"putaway_time" json:"-"`
	MarketPrice  int         `db:"market_price" json:"market_price"`
	IsSale       bool        `db:"-" json:"is_sale"`
	IsZFB        bool        `db:"is_zfb" json:"is_zfb"`
	ZPrice       int         `db:"zfb_price" json:"zfb_price"`
}

func UpdateIndex() {
	var (
		client *redis.Client
		//productIndex = engine
	)
	//defer ps.Close()
RESETPUBSUB:
	client = util.GetRedis()
	ps := client.PubSub()
	err := ps.Subscribe("product_trace")
	if err != nil {
		log.Println("Subscribe error:", err)
		return
	}
	for {
		payload, err := ps.ReceiveTimeout(time.Second * 5)
		if err != nil {
			if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
				continue
			}
			if err == io.EOF {
				ps.Close()
				time.Sleep(time.Second * 5)
				goto RESETPUBSUB
			}
			log.Println(err)
			continue
		}
		if payload == nil {
			continue
		}
		switch payload.(type) {
		case *redis.Subscription:

		case *redis.Message:
			msg := payload.(*redis.Message)
			if msg.Channel == "product_trace" {
				pieces := strings.Split(msg.Payload, "-")
				if len(pieces) < 2 {
					log.Println("error:wrong product_change message")
					break
				}
				if pieces[1] == "UPDATE" {
					err = addProductIdx(pieces[0])
					if err != nil {
						log.Println(err)
						break
					}
				} else if pieces[1] == "DELETE" {
					err = deleteProductIdx(pieces[0])
					if err != nil {
						log.Println(err)
						break
					}
				} else if pieces[1] == "ALL" {
					err = allProductIdx()
					if err != nil {
						log.Println(err)
						break
					}
				}
			}
		default:
			fmt.Printf("redis: unknown message: %v\n", payload)
		}
	}
}

func addProductIdx(productId string) error {
	strSql := "select id, name,price, is_recommend, picture,keywords, sale_num,putaway_time,sort_no,created_at,market_price,is_zfb,zfb_price from t_product  where id = ? and is_putaway=0"
	var product = productDB{}
	db := util.GetWriteSqlDB()
	err := db.Get(&product, strSql, productId)
	if err != nil {
		return fmt.Errorf("query product %d error: %v", productId, err)
	}
	strSql = "select t1.name from t_detect_product t1 left join t_product_detect_product t2 on t1.id = t2.detect_product_id where t2.product_id = ?"
	itemList := []string{}
	db.Select(&itemList, strSql, product.Id)
	product.Items = strings.Join(itemList, " ")
	/*strSql = "select tag_name from t_product_tag t1 left join t_tag t2 on t1.tag_id = t2.id where t1.product_id = ?"
	tagList := []string{}
	db.Select(&tagList, strSql, product.Id)
	product.Tags = strings.Join(tagList, " ")*/
	product.Keywords = product.TKeywords.String
	product.PutawayTime = product.TPutawayTime.String
	product.IsSale = product.Price != product.MarketPrice
	strSql = "select city_id from v_product_city where product_id = ?"
	cityIds := []string{}
	db.Select(&cityIds, strSql, product.Id)
	product.CityIds = cityIds
	product.Pinyin, product.JP, _ = util.GetPinyin(product.Name)
	strSql = "SELECT cat_id from t_product_category_product where product_id = ?"
	var cateIds = []string{}
	db.Select(&cateIds, strSql, product.Id)
	product.Cates = cateIds
	return engine.Index(product.Id, product)
}

func deleteProductIdx(productId string) error {
	return engine.Delete(productId)
}

func Init() {
	var err error
	var INDEX_NAME = config.IniConf.Section("search").Key("IndexName").Value()
	fmt.Println(INDEX_NAME)
	engine, err = bleve.Open(INDEX_NAME)
	if err != nil {
		log.Fatal(err)
	}
	_, err = bleve.Config.Cache.DefineFragmenter("size300", map[string]interface{}{
		"type": "simple",
		"size": 300.0,
	})
	if err != nil {
		log.Fatal(err)
	}
	_, err = bleve.Config.Cache.DefineHighlighter("custom", map[string]interface{}{
		"type":       "simple",
		"fragmenter": "size300",
		"formatter":  "html",
	})
	if err != nil {
		log.Fatal(err)
	}
}

func init() {
	config.RegistChangeCallback(Init)
}

func allProductIdx() error {
	strSql := "select id, name,price, is_recommend, picture, keywords,sale_num,putaway_time,sort_no,created_at,market_price,is_zfb,zfb_price from t_product  where is_putaway = 0 and is_delete = 0;"
	db := util.GetSqlDB()
	productList := []productDB{}
	err := db.Select(&productList, strSql)
	if err != nil {
		log.Fatal(err)
	}
	for _, product := range productList {
		strSql := "select t1.name from t_detect_product t1 left join t_product_detect_product t2 on t1.id = t2.detect_product_id where t2.product_id = " + product.Id
		itemList := []string{}
		db.Select(&itemList, strSql)
		//strSql = "select tag_name from t_product_tag t1 left join t_tag t2 on t1.tag_id = t2.id where t1.product_id = ?"
		//tagList := []string{}
		//db.Select(&tagList, strSql, product.Id)
		strSql = "select city_id from v_product_city where product_id = ?"
		cityIds := []string{}
		db.Select(&cityIds, strSql, product.Id)
		product.Items = strings.Join(itemList, " ")
		//product.Tags = strings.Join(tagList, " ")
		product.CityIds = cityIds
		product.Pinyin, product.JP, _ = util.GetPinyin(product.Name)
		product.Keywords = product.TKeywords.String
		product.PutawayTime = product.TPutawayTime.String
		product.IsSale = product.Price != product.MarketPrice
		strSql = "SELECT cat_id from t_product_category_product where product_id = ?"
		var cateIds = []string{}
		db.Select(&cateIds, strSql, product.Id)
		product.Cates = cateIds
		err = engine.Index(product.Id, product)
	}
	return err
}