package main

import (
	"context"
	"dsSupport/Utils/CommonUtil"
	"dsSupport/Utils/PgUtil"
	"encoding/json"
	"fmt"
	"github.com/olivere/elastic/v7"
	"github.com/tidwall/gjson"
	"log"
	"os"
	"time"
)

// 深度分页
// TODO
// 后续需要记录每个INDEX的最后同步时间，形成日志文件，现在是一次性全量同步
// 因目前是以业务主键ID保持，所以比ES的数据量肯定是要少的，因为更新的日志记录都没有同步到数仓，只是最终有效的业务ID同步过来。
// https://www.cnblogs.com/hello-shf/p/11543453.html

var client elastic.Client
var db = PgUtil.Engine

func main() {
	var host = "http://10.10.14.188:9200/"
	esClient, err := elastic.NewClient(
		elastic.SetURL(host),
		elastic.SetSniff(false),
		elastic.SetHealthcheckInterval(10*time.Second),
		elastic.SetGzip(true),
		elastic.SetErrorLog(log.New(os.Stderr, "ELASTIC ", log.LstdFlags)),
		elastic.SetInfoLog(log.New(os.Stdout, "", log.LstdFlags)),
	)

	if err != nil {
		panic(err)
	}

	//要同步的索引名称，也就是表名称
	indexName := "org_school"

	sql := `SELECT
    pg_constraint.conname AS pk_name,
    pg_attribute.attname AS colname,
    pg_type.typname AS typename
	FROM
		pg_constraint
	INNER JOIN pg_class ON pg_constraint.conrelid = pg_class.oid
	INNER JOIN pg_attribute ON pg_attribute.attrelid = pg_class.oid
	AND pg_attribute.attnum = pg_constraint.conkey [ 1 ]
	INNER JOIN pg_type ON pg_type.oid = pg_attribute.atttypid
	WHERE
		pg_class.relname = ?
	AND pg_constraint.contype = 'p'`
	list, _ := db.SQL(sql, indexName).Query().List()
	pk := list[0]["colname"].(string)

	//取所有
	CTX := context.Background()
	result, err := esClient.Scroll().Index(indexName).Size(10).Do(CTX)
	if err != nil {
		panic(err)
	}
	//第一次的结果集
	for i := range result.Hits.Hits {
		resByte, _ := json.Marshal(result.Hits.Hits[i].Source)
		resStr := string(resByte)
		value := gjson.Get(resStr, "data_content")
		addRecord(indexName, pk, value.String())
	}
	//继续用的 scoll_id
	scrollId := result.ScrollId

	//第一次命中的个数
	var nowCount = int64(len(result.Hits.Hits))
	//总的命中个数
	allCount := result.TotalHits()

	//开始循环
	for {
		//如果还有数据没有获取
		if allCount > nowCount {
			result, err = esClient.Scroll().ScrollId(scrollId).Do(CTX)
			scrollId = result.ScrollId
			nowCount += int64(len(result.Hits.Hits))

			for i := range result.Hits.Hits {
				resByte, _ := json.Marshal(result.Hits.Hits[i].Source)
				resStr := string(resByte)
				value := gjson.Get(resStr, "data_content")
				addRecord(indexName, pk, value.String())
			}
		} else {
			//没有数据了
			break
		}
	}
}
//后续优化为到达一定的阀值再提交一次，初步定为200一次
func addRecord(tableName string, pk string, jsonStr string) {
	var mymap map[string]interface{}
	var sql = ""
	if err := json.Unmarshal([]byte(jsonStr), &mymap); err == nil {
		//先删除再插入
		sql = `delete from ` + tableName + ` where ` + pk + `=?`
		switch (mymap[pk]).(type) {
		case string:
			_, err := db.SQL(sql, mymap[pk].(string)).Execute()
			if err != nil {
				panic(err.Error())
			}
			break
		case float64:
			_, err := db.SQL(sql, int64(mymap[pk].(float64))).Execute()
			if err != nil {
				panic(err.Error())
			}
			break
		default:
			break
		}
		//插入
		sql = `insert into ` + tableName + "("
		var lineSql = ""
		for key, value := range mymap {
			sql += key + ","
			switch value.(type) {
			case string:
				lineSql += "'" + value.(string) + "',"
				break
			case int64:
				lineSql += CommonUtil.ConvertInt64ToString(value.(int64)) + ","
				break
			case float64:
				lineSql += fmt.Sprintf("%d", int64(value.(float64))) + ","
				break
			default:
				break
			}
		}
		lineSql = lineSql[0 : len(lineSql)-1]
		sql = sql[0 : len(sql)-1]
		sql += ") values(" + lineSql + ");"
	} else {
		fmt.Println(err.Error())
	}
	fmt.Println(sql)
	_, err := db.SQL(sql).Execute()
	if err != nil {
		panic(err.Error())
	} else {
		fmt.Println("成功插入一条数据！")
	}
}