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// Copyright 2012-present Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.

package elastic

import (
	"context"
	"fmt"
	"net/url"

	"github.com/olivere/elastic/uritemplates"
)

// IndexService adds or updates a typed JSON document in a specified index,
// making it searchable.
//
// See https://www.elastic.co/guide/en/elasticsearch/reference/6.0/docs-index_.html
// for details.
type IndexService struct {
	client              *Client
	pretty              bool
	id                  string
	index               string
	typ                 string
	parent              string
	routing             string
	timeout             string
	timestamp           string
	ttl                 string
	version             interface{}
	opType              string
	versionType         string
	refresh             string
	waitForActiveShards string
	pipeline            string
	bodyJson            interface{}
	bodyString          string
}

// NewIndexService creates a new IndexService.
func NewIndexService(client *Client) *IndexService {
	return &IndexService{
		client: client,
	}
}

// Id is the document ID.
func (s *IndexService) Id(id string) *IndexService {
	s.id = id
	return s
}

// Index is the name of the index.
func (s *IndexService) Index(index string) *IndexService {
	s.index = index
	return s
}

// Type is the type of the document.
func (s *IndexService) Type(typ string) *IndexService {
	s.typ = typ
	return s
}

// WaitForActiveShards sets the number of shard copies that must be active
// before proceeding with the index operation. Defaults to 1, meaning the
// primary shard only. Set to `all` for all shard copies, otherwise set to
// any non-negative value less than or equal to the total number of copies
// for the shard (number of replicas + 1).
func (s *IndexService) WaitForActiveShards(waitForActiveShards string) *IndexService {
	s.waitForActiveShards = waitForActiveShards
	return s
}

// Pipeline specifies the pipeline id to preprocess incoming documents with.
func (s *IndexService) Pipeline(pipeline string) *IndexService {
	s.pipeline = pipeline
	return s
}

// Refresh the index after performing the operation.
func (s *IndexService) Refresh(refresh string) *IndexService {
	s.refresh = refresh
	return s
}

// Ttl is an expiration time for the document.
func (s *IndexService) Ttl(ttl string) *IndexService {
	s.ttl = ttl
	return s
}

// TTL is an expiration time for the document (alias for Ttl).
func (s *IndexService) TTL(ttl string) *IndexService {
	s.ttl = ttl
	return s
}

// Version is an explicit version number for concurrency control.
func (s *IndexService) Version(version interface{}) *IndexService {
	s.version = version
	return s
}

// OpType is an explicit operation type, i.e. "create" or "index" (default).
func (s *IndexService) OpType(opType string) *IndexService {
	s.opType = opType
	return s
}

// Parent is the ID of the parent document.
func (s *IndexService) Parent(parent string) *IndexService {
	s.parent = parent
	return s
}

// Routing is a specific routing value.
func (s *IndexService) Routing(routing string) *IndexService {
	s.routing = routing
	return s
}

// Timeout is an explicit operation timeout.
func (s *IndexService) Timeout(timeout string) *IndexService {
	s.timeout = timeout
	return s
}

// Timestamp is an explicit timestamp for the document.
func (s *IndexService) Timestamp(timestamp string) *IndexService {
	s.timestamp = timestamp
	return s
}

// VersionType is a specific version type.
func (s *IndexService) VersionType(versionType string) *IndexService {
	s.versionType = versionType
	return s
}

// Pretty indicates that the JSON response be indented and human readable.
func (s *IndexService) Pretty(pretty bool) *IndexService {
	s.pretty = pretty
	return s
}

// BodyJson is the document as a serializable JSON interface.
func (s *IndexService) BodyJson(body interface{}) *IndexService {
	s.bodyJson = body
	return s
}

// BodyString is the document encoded as a string.
func (s *IndexService) BodyString(body string) *IndexService {
	s.bodyString = body
	return s
}

// buildURL builds the URL for the operation.
func (s *IndexService) buildURL() (string, string, url.Values, error) {
	var err error
	var method, path string

	if s.id != "" {
		// Create document with manual id
		method = "PUT"
		path, err = uritemplates.Expand("/{index}/{type}/{id}", map[string]string{
			"id":    s.id,
			"index": s.index,
			"type":  s.typ,
		})
	} else {
		// Automatic ID generation
		// See https://www.elastic.co/guide/en/elasticsearch/reference/6.0/docs-index_.html#index-creation
		method = "POST"
		path, err = uritemplates.Expand("/{index}/{type}/", map[string]string{
			"index": s.index,
			"type":  s.typ,
		})
	}
	if err != nil {
		return "", "", url.Values{}, err
	}

	// Add query string parameters
	params := url.Values{}
	if s.pretty {
		params.Set("pretty", "true")
	}
	if s.waitForActiveShards != "" {
		params.Set("wait_for_active_shards", s.waitForActiveShards)
	}
	if s.refresh != "" {
		params.Set("refresh", s.refresh)
	}
	if s.opType != "" {
		params.Set("op_type", s.opType)
	}
	if s.parent != "" {
		params.Set("parent", s.parent)
	}
	if s.pipeline != "" {
		params.Set("pipeline", s.pipeline)
	}
	if s.routing != "" {
		params.Set("routing", s.routing)
	}
	if s.timeout != "" {
		params.Set("timeout", s.timeout)
	}
	if s.timestamp != "" {
		params.Set("timestamp", s.timestamp)
	}
	if s.ttl != "" {
		params.Set("ttl", s.ttl)
	}
	if s.version != nil {
		params.Set("version", fmt.Sprintf("%v", s.version))
	}
	if s.versionType != "" {
		params.Set("version_type", s.versionType)
	}
	return method, path, params, nil
}

// Validate checks if the operation is valid.
func (s *IndexService) Validate() error {
	var invalid []string
	if s.index == "" {
		invalid = append(invalid, "Index")
	}
	if s.typ == "" {
		invalid = append(invalid, "Type")
	}
	if s.bodyString == "" && s.bodyJson == nil {
		invalid = append(invalid, "BodyJson")
	}
	if len(invalid) > 0 {
		return fmt.Errorf("missing required fields: %v", invalid)
	}
	return nil
}

// Do executes the operation.
func (s *IndexService) Do(ctx context.Context) (*IndexResponse, error) {
	// Check pre-conditions
	if err := s.Validate(); err != nil {
		return nil, err
	}

	// Get URL for request
	method, path, params, err := s.buildURL()
	if err != nil {
		return nil, err
	}

	// Setup HTTP request body
	var body interface{}
	if s.bodyJson != nil {
		body = s.bodyJson
	} else {
		body = s.bodyString
	}

	// Get HTTP response
	res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
		Method: method,
		Path:   path,
		Params: params,
		Body:   body,
	})
	if err != nil {
		return nil, err
	}

	// Return operation response
	ret := new(IndexResponse)
	if err := s.client.decoder.Decode(res.Body, ret); err != nil {
		return nil, err
	}
	return ret, nil
}

// IndexResponse is the result of indexing a document in Elasticsearch.
type IndexResponse struct {
	Index         string      `json:"_index,omitempty"`
	Type          string      `json:"_type,omitempty"`
	Id            string      `json:"_id,omitempty"`
	Version       int64       `json:"_version,omitempty"`
	Result        string      `json:"result,omitempty"`
	Shards        *shardsInfo `json:"_shards,omitempty"`
	SeqNo         int64       `json:"_seq_no,omitempty"`
	PrimaryTerm   int64       `json:"_primary_term,omitempty"`
	Status        int         `json:"status,omitempty"`
	ForcedRefresh bool        `json:"forced_refresh,omitempty"`
}