package EsUtil

import (
	"dsData/Utils/ConfigUtil"
	"dsData/Utils/HttpUtil"
	"fmt"
	"github.com/tidwall/gjson"
)

/**
功能：对指定的索引进行分页查询
作者：黄海
时间：2020-03-23
*/
func QueryPage(indexName string, lastUpdatedTime string, pk string) (string, string, []map[string]interface{}) {
	url := ConfigUtil.ElasticSearchAddress + "/" + indexName + "/_search?pretty"
	postBody := `
			{
				"track_total_hits":true,
				"query": {
					"bool": {
						"must": [{
							"range": {
								"last_updated_time": {
									"gte": "` + lastUpdatedTime + `"
								}
							}
						},
						{
							"range": {
								"pk": {
									"gt": "` + pk + `"
								}
							}
						}]
					}
				},
				 "sort": [
					{
					 "last_updated_time": {"order": "asc"}					  
					},
                    {
					 "pk": {"order": "asc"}					  
					}
				  ],
				"from": 0,
				"size": 100
			}
			`
	body, err := HttpUtil.FastHttpPost(url, postBody)
	if err != nil {
		fmt.Println(err)
	}
	//万能的map[string]interface{}
	var list []map[string]interface{}
	var vLastUpdatedTime string
	var vPk string
	gjson.Get(body, "hits").Get("hits").ForEach(func(key, value gjson.Result) bool {
		//反序列化到map
		result, _ := value.Get("_source").Value().(map[string]interface{})
		list = append(list, result)
		//记录最后一条的最后修改时间，最后一条的主键
		vLastUpdatedTime = value.Get("last_updated_time").String()
		vPk = value.Get("pk").String()
		return true // 保持继续！
	})
	return vLastUpdatedTime, vPk, list
}