package es

import (
	"context"
	"encoding/json"
	"github.com/olivere/elastic/v7"
	"reflect"
)

type (
	// SearchParams 搜索参数
	SearchParams struct {
		TermParams   map[string]interface{}
		MustParams   map[string]interface{}
		ShouldParams map[string]interface{}
	}
)

// Create 创建操作
func Create(index, id string, body []byte) error {
	_, err := client.Index().
		Index(index).
		Id(id).
		BodyJson(string(body)).
		Do(context.Background())
	return err
}

// Update 更新操作
func Update(index, id string, params map[string]interface{}) error {
	scriptStr := ""

	for k := range params {
		scriptStr += "ctx._source." + k + " = params." + k + ";"
	}
	script := elastic.NewScript(scriptStr).Params(params)

	_, err := client.Update().
		Index(index).
		Id(id).
		Script(script).
		//Doc(string(body)).
		Do(context.Background())
	return err
}

// Search 搜索操作
func Search(src interface{}, index string, params *SearchParams, page, pageSize int) ([]interface{}, int64, error) {
	query := elastic.NewBoolQuery()

	if params != nil {
		if params.TermParams != nil && len(params.TermParams) > 0 {
			for k, v := range params.TermParams {
				// 精确查找
				query.Must(elastic.NewMatchPhraseQuery(k, v))
			}
		}
		if params.MustParams != nil && len(params.MustParams) > 0 {
			for k, v := range params.MustParams {
				// 分词匹配
				query.Must(elastic.NewMatchQuery(k, v))
			}
		}
		if params.ShouldParams != nil && len(params.ShouldParams) > 0 {
			for k, v := range params.ShouldParams {
				// 分词匹配，查询到一个即可
				query.Should(elastic.NewMatchQuery(k, v))
			}
		}
	}
	service := client.Search().Index(index)

	if page > 0 && pageSize > 0 {
		// 游标分页
		service = service.From((page - 1) * pageSize).Size(pageSize)
	}
	result, err := service.TrackTotalHits(true).Pretty(true).Query(query).Do(context.Background())

	if err != nil {
		return nil, 0, err
	}
	out := make([]interface{}, 0)

	_type := reflect.TypeOf(src).Elem()

	for _, hit := range result.Hits.Hits {
		_src := reflect.New(_type).Interface()

		if err = json.Unmarshal(hit.Source, _src); err != nil {
			return nil, 0, err
		}
		out = append(out, _src)
	}
	return out, result.Hits.TotalHits.Value, err
}

// Delete 删除操作
func Delete(index, id string) error {
	_, err := client.Delete().Index(index).Do(context.Background())
	return err
}