package es

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"eta/eta_mini_ht_api/common/component/config"
	logger "eta/eta_mini_ht_api/common/component/log"
	"eta/eta_mini_ht_api/common/contants"
	"fmt"
	"github.com/elastic/go-elasticsearch/v7"
	"github.com/elastic/go-elasticsearch/v7/esapi"
	"io"
	"strconv"
	"strings"
	"sync"
)

type ESBase interface {
	GetId() string
}

var (
	esOnce   sync.Once
	esClient *ESClient
)

type ESClient struct {
	esOp *elasticsearch.Client
}

type SearchType string

const (
	MatchAll = "match_all"
	Match    = "match"

	CountWithDocIds                          = "count_with_doc_ids"
	Range                                    = "range"
	MatchAllByCondition                      = "match_all_by_condition"
	RangeByCondition                         = "range_by_condition"
	RangeByConditionWithDocIds               = "range_by_condition_with_doc_ids"
	RangeByConditionWithDocIdsNoLimit        = "range_by_condition_with_doc_ids_no_limit"
	RangeByConditionWithDocIdsNoLimitByScore = "range_by_condition_with_doc_ids_no_limit_by_score"
	RangeWithDocIds                          = "range_with_doc_ids"
	LimitByScore                             = "limit_by_score"
	HomeSearch                               = "home_search"
)

func GetInstance() *ESClient {
	esOnce.Do(func() {
		// 检查是否成功获取到RedisConfig实例,没有配置则不进行redis初始化
		if esConf, ok := config.GetConfig(contants.ES).(*config.ESConfig); ok {
			logger.Info("初始化es")
			// 这里可以添加初始化Redis的逻辑
			esClient = newEs(esConf)
			logger.Info("es地址:%v", esConf.GetUrl())
		}
	})
	return esClient
}
func (es *ESClient) es() *elasticsearch.Client {
	return es.esOp
}
func newEs(config *config.ESConfig) *ESClient {
	elasticsearch.NewDefaultClient()
	client, err := elasticsearch.NewClient(
		elasticsearch.Config{
			Addresses: []string{config.GetUrl()},
			// A list of Elasticsearch nodes to use.
			Username: config.GetUserName(),
			Password: config.GetPassword(), // Password for HTTP Basic Authentication.
		},
	)
	if err != nil {
		logger.Error("连接ES失败:%v", err)
		panic("启动es失败")
	}
	return &ESClient{esOp: client}
}

func init() {
	if GetInstance() == nil {
		panic("初始化es失败")
	}
	logger.Info("es初始化成功")
}

// BulkInsert 批量创建文档
func (es *ESClient) BulkInsert(indexName string, docs []ESBase) (err error) {
	// 创建批量请求
	bulkBody := new(bytes.Buffer)
	for _, doc := range docs {
		enc := json.NewEncoder(bulkBody)
		if err = enc.Encode(map[string]interface{}{
			"index": map[string]interface{}{
				"_index": indexName,
				"_id":    doc.GetId(),
			},
		}); err != nil {
			logger.Error("生成es批处理请求参数失败: %s", err)
		}
		if err = enc.Encode(doc); err != nil {
			logger.Error("生成es批处理文档失败: %s", err)
		}
	}
	bulkReq := esapi.BulkRequest{
		Body:    bytes.NewReader(bulkBody.Bytes()),
		Refresh: "true",
	}

	res, err := bulkReq.Do(context.Background(), es.esOp)
	if err != nil {
		logger.Error("es批处理创建失败: %s", err)
	}
	defer res.Body.Close()
	if res.IsError() {
		var e map[string]interface{}
		if err = json.NewDecoder(res.Body).Decode(&e); err != nil {
			logger.Error("解析es应答失败: %v", err)
		} else {
			logger.Error("es请求失败: %s: %v\n", res.Status(), err)
		}
	}
	return
}

type ESResponse struct {
	Took     int        `json:"took"`
	Count    int        `json:"count"`
	TimedOut bool       `json:"timedOut"`
	Hits     Hits       `json:"hits"`
	_Shards  ShardsInfo `json:"_shards"`
}

type Hits struct {
	Total    TotalHits `json:"total"`
	MaxScore float64   `json:"maxScore"`
	Hits     []Hit     `json:"hits"`
}

type TotalHits struct {
	Value    int    `json:"value"`
	Relation string `json:"relation"`
}

type Hit struct {
	Index     string          `json:"_index"`
	Type      string          `json:"_type"`
	ID        string          `json:"_id"`
	Score     float64         `json:"_score"`
	Source    json.RawMessage `json:"_source"`
	Highlight json.RawMessage `json:"highlight"`
}

type Doc struct {
	Index       string          `json:"_index"`
	Type        string          `json:"_type"`
	ID          string          `json:"_id"`
	Version     float64         `json:"_version"`
	SeqNo       float64         `json:"_seq_no"`
	PrimaryTerm float64         `json:"_primary_term"`
	Found       bool            `json:"found"`
	Source      json.RawMessage `json:"_source"`
}
type ShardsInfo struct {
	Total      int `json:"total"`
	Successful int `json:"successful"`
	Skipped    int `json:"skipped"`
	Failed     int `json:"failed"`
}
type ESQueryRequest struct {
	IndexName      string
	From           int
	Size           int
	Key            string
	Column         string
	Condition      string
	ConditionValue string
	Sorts          []string
	Type           SearchType
	RangeColumn    string
	DocIds         []string
	Max            interface{}
	Min            interface{}
	MinScore       float64
}

func (req *ESQueryRequest) CreateESQueryRequest(index string, column string, key string, from int, size int, sorts []string, searchType SearchType) *ESQueryRequest {
	return &ESQueryRequest{
		IndexName: index,
		Type:      searchType,
		From:      from,
		Size:      size,
		Key:       key,
		Column:    column,
		Sorts:     sorts,
	}
}
func (req *ESQueryRequest) Limit(limit int) *ESQueryRequest {
	req.Size = limit
	return req
}
func (req *ESQueryRequest) WithScore(score float64) *ESQueryRequest {
	req.MinScore = score
	return req
}
func (req *ESQueryRequest) Range(from int64, to int64, column string) *ESQueryRequest {
	req.RangeColumn = column
	req.Max = to
	req.Min = from
	return req
}
func (req *ESQueryRequest) Before(max interface{}, column string) *ESQueryRequest {
	req.RangeColumn = column
	req.Max = max
	return req
}
func (req *ESQueryRequest) ByCondition(column string, value string) *ESQueryRequest {
	req.Condition = column
	req.ConditionValue = value
	return req
}
func (req *ESQueryRequest) WithDocs(docIds []string) *ESQueryRequest {
	req.DocIds = docIds
	return req
}
func (req *ESQueryRequest) parseJsonQuery() (queryMap map[string]interface{}) {
	switch req.Type {
	case MatchAll:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"match": map[string]interface{}{
					req.Column: req.Key,
				},
			},
		}
		return
	case MatchAllByCondition:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"bool": map[string]interface{}{
					"must": []map[string]interface{}{
						{
							"match": map[string]interface{}{
								req.Column: req.Key,
							},
						},
						{
							"term": map[string]interface{}{
								req.Condition: req.ConditionValue,
							},
						},
					},
				},
			},
		}
		return
	case Match:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"match": map[string]interface{}{
					req.Column: req.Key,
				},
			},
			"highlight": map[string]interface{}{
				"fields": map[string]interface{}{
					req.Column: map[string]interface{}{},
				},
				"pre_tags":  []string{"<span style='color:#0078E8'>"},
				"post_tags": []string{"</span>"},
			},
		}
		return
	case CountWithDocIds:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"bool": map[string]interface{}{
					"must": []map[string]interface{}{
						{
							"match": map[string]interface{}{
								req.Column: req.Key,
							},
						},
					},
					"filter": map[string]interface{}{
						"terms": map[string]interface{}{
							"_id": req.DocIds,
						},
					},
				},
			},
		}
		return
	case Range:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"match": map[string]interface{}{
					req.Column: req.Key,
				},
			},
			"highlight": map[string]interface{}{
				"fields": map[string]interface{}{
					req.Column: map[string]interface{}{},
				},
				"pre_tags":  []string{"<span style='color:#0078E8'>"},
				"post_tags": []string{"</span>"},
			},
			"post_filter": map[string]interface{}{
				"range": map[string]interface{}{
					req.RangeColumn: map[string]interface{}{
						"gte": req.Min,
						"lte": req.Max,
					},
				},
			},
		}
		return
	case RangeWithDocIds:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"match": map[string]interface{}{
					req.Column: req.Key,
				},
			},
			"highlight": map[string]interface{}{
				"fields": map[string]interface{}{
					req.Column: map[string]interface{}{},
				},
				"pre_tags":  []string{"<span style='color:#0078E8'>"},
				"post_tags": []string{"</span>"},
			},
			"post_filter": map[string]interface{}{
				"bool": map[string]interface{}{
					"must": []map[string]interface{}{
						{
							"range": map[string]interface{}{
								req.RangeColumn: map[string]interface{}{
									"gte": req.Min,
									"lte": req.Max,
								},
							},
						},
						{
							"terms": map[string]interface{}{
								"_id": req.DocIds,
							},
						},
					},
				},
			},
		}
		return
	case RangeByCondition:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"match": map[string]interface{}{
					req.Column: req.Key,
				},
			},
			"highlight": map[string]interface{}{
				"fields": map[string]interface{}{
					req.Column: map[string]interface{}{},
				},
				"pre_tags":  []string{"<span style='color:#0078E8'>"},
				"post_tags": []string{"</span>"},
			},
			"post_filter": map[string]interface{}{
				"bool": map[string]interface{}{
					"must": []map[string]interface{}{
						{
							"range": map[string]interface{}{
								req.RangeColumn: map[string]interface{}{
									"gte": req.Min,
									"lte": req.Max,
								},
							},
						},
						{
							"term": map[string]interface{}{
								req.Condition: req.ConditionValue,
							},
						},
					},
				},
			},
		}
		return
	case RangeByConditionWithDocIds:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"match": map[string]interface{}{
					req.Column: req.Key,
				},
			},
			"highlight": map[string]interface{}{
				"fields": map[string]interface{}{
					req.Column: map[string]interface{}{},
				},
				"pre_tags":  []string{"<span style='color:#0078E8'>"},
				"post_tags": []string{"</span>"},
			},
			"post_filter": map[string]interface{}{
				"bool": map[string]interface{}{
					"must": []map[string]interface{}{
						{
							"range": map[string]interface{}{
								req.RangeColumn: map[string]interface{}{
									"gte": req.Min,
									"lte": req.Max,
								},
							},
						},
						{
							"term": map[string]interface{}{
								req.Condition: req.ConditionValue,
							},
						},
						{
							"terms": map[string]interface{}{
								"_id": req.DocIds,
							},
						},
					},
				},
			},
		}
		return
	case RangeByConditionWithDocIdsNoLimit:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"match": map[string]interface{}{
					req.Column: req.Key,
				},
			},
			"highlight": map[string]interface{}{
				"fields": map[string]interface{}{
					req.Column: map[string]interface{}{},
				},
				"pre_tags":  []string{"<span style='color:#0078E8'>"},
				"post_tags": []string{"</span>"},
			},
			"post_filter": map[string]interface{}{
				"bool": map[string]interface{}{
					"must": []map[string]interface{}{
						{
							"terms": map[string]interface{}{
								"_id": req.DocIds,
							},
						},
					},
				},
			},
		}
		return
	case RangeByConditionWithDocIdsNoLimitByScore:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"match": map[string]interface{}{
					req.Column: req.Key,
				},
			},
			"highlight": map[string]interface{}{
				"fields": map[string]interface{}{
					req.Column: map[string]interface{}{},
				},
				"pre_tags":  []string{"<span style='color:#0078E8'>"},
				"post_tags": []string{"</span>"},
			},
			"post_filter": map[string]interface{}{
				"bool": map[string]interface{}{
					"must": []map[string]interface{}{
						{
							"terms": map[string]interface{}{
								"_id": req.DocIds,
							},
						},
					},
				},
			},
			"min_score": req.MinScore,
		}
		return
	case LimitByScore:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"match": map[string]interface{}{
					req.Column: req.Key,
				},
			},
			"highlight": map[string]interface{}{
				"fields": map[string]interface{}{
					req.Column: map[string]interface{}{},
				},
				"pre_tags":  []string{"<span style='color:#0078E8'>"},
				"post_tags": []string{"</span>"},
			},
			"post_filter": map[string]interface{}{
				"bool": map[string]interface{}{
					"must": []map[string]interface{}{
						{
							"terms": map[string]interface{}{
								"_id": req.DocIds,
							},
						},
					},
				},
			},
			"min_score": req.MinScore,
		}
		return
	case HomeSearch:
		queryMap = map[string]interface{}{
			"query": map[string]interface{}{
				"bool": map[string]interface{}{
					"should": []map[string]interface{}{
						{
							"bool": map[string]interface{}{
								"must": []map[string]interface{}{
									{
										"match": map[string]interface{}{
											"title": req.Key,
										},
									},
									{
										"term": map[string]interface{}{
											"status": "PUBLISH",
										},
									},
									{
										"range": map[string]interface{}{
											"publishedTime": map[string]interface{}{
												"lte": req.Max,
											},
										},
									},
								},
							},
						},
						{
							"bool": map[string]interface{}{
								"must": []map[string]interface{}{
									{
										"match": map[string]interface{}{
											"mediaName": req.Key,
										},
									},
									{
										"range": map[string]interface{}{
											req.RangeColumn: map[string]interface{}{
												"lte": req.Max,
											},
										},
									},
								},
							},
						},
					},
				},
			},
			"highlight": map[string]interface{}{
				"fields": map[string]interface{}{
					"title":     map[string]interface{}{},
					"mediaName": map[string]interface{}{},
				},
				"pre_tags":  []string{"<span style='color:#0078E8'>"},
				"post_tags": []string{"</span>"},
			},
		}
		return
	default:
		queryMap = map[string]interface{}{}
		return
	}
}

// /*
// *
//
//	搜索
//
// indexName 访问索引名
// query	搜索条件
// from    开始搜索位置
// size	搜索条数
// sort 	排序
// */

func (es *ESClient) Count(params *ESQueryRequest) (response ESResponse, err error) {
	queryMap := params.parseJsonQuery()
	jsonQuery, _ := json.Marshal(queryMap)
	logger.Info("查询语句: %s", string(jsonQuery))
	request := esapi.CountRequest{
		Index: []string{params.IndexName},
		Body:  strings.NewReader(string(jsonQuery)),
	}
	res, err := request.Do(context.Background(), esClient.esOp)
	defer res.Body.Close()
	if err != nil {
		logger.Error("es查询失败: %s", err)
	}
	if res.IsError() {
		var e map[string]interface{}
		if err = json.NewDecoder(res.Body).Decode(&e); err != nil {
			logger.Error("解析es应答失败: %v", err)
		} else {
			logger.Error("es请求失败: %s: %v\n", res.Status(), e)
		}
	}
	body, err := io.ReadAll(res.Body)
	if err != nil {
		logger.Error("获取es应答失败: %v", err)
	}
	return parseESResponse(body)
}
func (es *ESClient) Search(params *ESQueryRequest) (response ESResponse, err error) {
	queryMap := params.parseJsonQuery()
	jsonQuery, _ := json.Marshal(queryMap)
	logger.Info("查询语句: %s", string(jsonQuery))
	indexes := strings.Split(params.IndexName, ",")
	request := esapi.SearchRequest{
		Index: indexes,
		Body:  strings.NewReader(string(jsonQuery)),
		From:  &params.From,
		Size:  &params.Size,
		Sort:  params.Sorts,
	}
	res, err := request.Do(context.Background(), esClient.esOp)

	defer res.Body.Close()
	if err != nil {
		logger.Error("es查询失败: %s", err)
	}
	if res.IsError() {
		var e map[string]interface{}
		if err = json.NewDecoder(res.Body).Decode(&e); err != nil {
			logger.Error("解析es应答失败: %v", err)
		} else {
			logger.Error("es请求失败: %s: %v\n", res.Status(), e)
		}
	}
	body, err := io.ReadAll(res.Body)
	if err != nil {
		logger.Error("获取es应答失败: %v", err)
	}
	return parseESResponse(body)
}
func parseESResponse(body []byte) (ESResponse, error) {
	var response ESResponse
	if err := json.Unmarshal(body, &response); err != nil {
		return ESResponse{}, err
	}
	for _, hit := range response.Hits.Hits {
		var source map[string]interface{}
		if err := json.Unmarshal(hit.Source, &source); err != nil {
			return ESResponse{}, err
		}
	}
	return response, nil
}

func (es *ESClient) GetSource(hits Hits) []Hit {
	return hits.Hits
}

func (es *ESClient) GetCount(hits Hits) []Hit {
	return hits.Hits
}

// /*
// *
// 添加es
// indexName 索引名
// id es的id
// body es的值
// */
func (es *ESClient) Update(indexName string, id int, doc interface{}) bool {
	jsonUpdate := map[string]interface{}{
		"doc": doc,
	}
	jsonDoc, _ := json.Marshal(jsonUpdate)
	logger.Info("查询语句: %s", string(jsonDoc))
	req := esapi.UpdateRequest{
		Index:      indexName,
		DocumentID: strconv.Itoa(id),
		Body:       strings.NewReader(string(jsonDoc)),
		Refresh:    "true",
	}
	res, err := req.Do(context.Background(), es.es())
	defer res.Body.Close()
	if err != nil {
		logger.Error("es查询失败: %s", err)
	}
	if res.IsError() {
		var e map[string]interface{}
		if err = json.NewDecoder(res.Body).Decode(&e); err != nil {
			logger.Error("解析es应答失败: %v", err)
		} else {
			logger.Error("es请求失败: %s: %v\n", res.Status(), e)
		}
	}
	body, err := io.ReadAll(res.Body)
	if err != nil {
		logger.Error("获取es应答失败: %v", err)
	}
	fmt.Printf("%s\n", string(body))
	return true
}
func (es *ESClient) InsertOrUpdate(indexName string, id int, doc interface{}) (success bool) {
	if exist, existErr := es.Exist(indexName, id); existErr == nil && exist {
		return es.Update(indexName, id, doc)
	} else {
		return es.CreateDocument(indexName, id, doc)
	}
}

// Delete *
// 删除
// indexName 索引名
// id es的id
// */
func (es *ESClient) Delete(indexName string, query interface{}) bool {
	jsonQuery, _ := json.Marshal(query)
	refresh := new(bool)
	*refresh = true
	logger.Info("查询语句: %s", string(jsonQuery))
	req := esapi.DeleteByQueryRequest{
		Index:   []string{indexName},
		Body:    strings.NewReader(string(jsonQuery)),
		Refresh: refresh,
	}
	res, err := req.Do(context.Background(), es.es())
	defer res.Body.Close()
	if err != nil {
		logger.Error("es查询失败: %s", err)
	}
	if res.IsError() {
		var e map[string]interface{}
		if err = json.NewDecoder(res.Body).Decode(&e); err != nil {
			logger.Error("解析es应答失败: %v", err)
		} else {
			logger.Error("es请求失败: %s: %v\n", res.Status(), e)
		}
	}
	body, err := io.ReadAll(res.Body)
	if err != nil {
		logger.Error("获取es应答失败: %v", err)
	}
	fmt.Printf("%s\n", string(body))
	return true

}

func (es *ESClient) Exist(indexName string, docId int) (exist bool, err error) {

	getRequest := esapi.GetRequest{
		Index:      indexName,
		DocumentID: strconv.Itoa(docId),
	}
	// 执行请求
	res, err := getRequest.Do(context.Background(), es.es())
	if err != nil {
		logger.Error("es获取文档是否存在失败: %v", err)
		return
	}
	defer res.Body.Close()
	// 检查文档是否存在
	if res.IsError() {
		// 如果文档不存在，通常返回 404 Not Found
		if res.StatusCode == 404 {
			logger.Info("文档不存在.")
			err = errors.New("ES文档不存在")
			return
		} else {
			// 其他错误
			var e map[string]interface{}
			if err = json.NewDecoder(res.Body).Decode(&e); err != nil {
				logger.Error("解析es应答失败: %v", err)
				return
			} else {
				// Print the response status and error information.
				logger.Error("[%s] %s: %s\n", res.Status(), e["error"].(map[string]interface{})["type"], e["error"].(map[string]interface{})["原因"])
				err = errors.New("获取ES记录失败")
				return
			}
		}
	} else {
		// 如果文档存在
		logger.Info("doc存在")
		return true, nil
	}
}

func (es *ESClient) Get(indexName string, docId int) (doc Doc, err error) {

	getRequest := esapi.GetRequest{
		Index:      indexName,
		DocumentID: strconv.Itoa(docId),
	}
	// 执行请求
	res, err := getRequest.Do(context.Background(), es.es())
	if err != nil {
		logger.Error("es获取文档是否存在失败: %v", err)
		return
	}
	defer res.Body.Close()
	// 检查文档是否存在
	if res.IsError() {
		// 如果文档不存在，通常返回 404 Not Found
		if res.StatusCode == 404 {
			logger.Info("文档不存在.")
			err = errors.New("ES文档不存在")
			return
		} else {
			// 其他错误
			var e map[string]interface{}
			if err = json.NewDecoder(res.Body).Decode(&e); err != nil {
				logger.Error("解析es应答失败: %v", err)
				return
			} else {
				// Print the response status and error information.
				logger.Error("[%s] %s: %s\n", res.Status(), e["error"].(map[string]interface{})["type"], e["error"].(map[string]interface{})["原因"])
				err = errors.New("获取ES记录失败")
				return
			}
		}
	} else {
		// 如果文档存在
		body, readErr := io.ReadAll(res.Body)
		if readErr != nil {
			logger.Error("获取es应答失败: %v", err)
			err = readErr
			return
		}
		err = json.Unmarshal(body, &doc)
		if err != nil {
			logger.Error("反序列化es应答失败: %v", err)
			return
		}
		return
	}
}

//
//func CreateIndex(indexName string) error {
//	resp, err := esClient.es().Indices.
//		Create(indexName).
//		Do(context.Background())
//	if err != nil {
//		logger.Error("创建ES索引失败:%v", err)
//		return err
//	}
//	fmt.Printf("index:%#v\n", resp.Index)
//	return nil
//}

// DeleteIndex 删除索引
//
//	func DeleteIndex(indexName string) error {
//		_, err := esClient.es().Indices. // 表明是对索引的操作，而Index则表示是要操作具体索引下的文档
//							Delete(indexName).
//							Do(context.Background())
//		if err != nil {
//			fmt.Printf("delete index failed,err:%v\n", err)
//			return err
//		}
//		fmt.Printf("delete index successed,indexName:%s", indexName)
//		return nil
//	}
//
// CreateDocument 创建文档
func (es *ESClient) CreateDocument(indexName string, id int, doc interface{}) (success bool) {
	jsonDoc, _ := json.Marshal(doc)
	logger.Info("查询语句: %s", string(jsonDoc))
	// 添加文档
	indexRequest := esapi.IndexRequest{
		Index:      indexName,
		DocumentID: strconv.Itoa(id),
		Body:       strings.NewReader(string(jsonDoc)),
		Refresh:    "true",
	}

	// 执行请求
	res, err := indexRequest.Do(context.Background(), es.es())
	if err != nil {
		logger.Error("ES创建文档失败: %s", err)
		return false
	}
	defer res.Body.Close()

	// 检查文档是否成功创建
	if res.IsError() {
		var e map[string]interface{}
		if err := json.NewDecoder(res.Body).Decode(&e); err != nil {
			logger.Error("解析ES应答失败: %s", err)
		} else {
			// Print the response status and error information.
			logger.Error("[%s] %s: %s\n", res.Status(), e["error"].(map[string]interface{})["类型"], e["错误"].(map[string]interface{})["原因"])
		}
		return false
	} else {
		// 如果文档成功创建
		logger.Info("创建文档成功")
		return true
	}
}