// 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"
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"reflect"
	"strings"

	"github.com/olivere/elastic/v7/uritemplates"
)

// XPackAsyncSearchSubmit is an XPack API for asynchronously
// searching for documents in Elasticsearch.
//
// For more details, see the documentation at
// https://www.elastic.co/guide/en/elasticsearch/reference/7.9/async-search.html
type XPackAsyncSearchSubmit struct {
	client *Client

	pretty     *bool       // pretty format the returned JSON response
	human      *bool       // return human readable values for statistics
	errorTrace *bool       // include the stack trace of returned errors
	filterPath []string    // list of filters used to reduce the response
	headers    http.Header // custom request-level HTTP headers

	searchSource               *SearchSource // q
	source                     interface{}
	searchType                 string // search_type
	index                      []string
	typ                        []string
	routing                    string // routing
	preference                 string // preference
	requestCache               *bool  // request_cache
	ignoreUnavailable          *bool  // ignore_unavailable
	ignoreThrottled            *bool  // ignore_throttled
	allowNoIndices             *bool  // allow_no_indices
	expandWildcards            string // expand_wildcards
	lenient                    *bool  // lenient
	maxResponseSize            int64
	allowPartialSearchResults  *bool // allow_partial_search_results
	typedKeys                  *bool // typed_keys
	seqNoPrimaryTerm           *bool // seq_no_primary_term
	batchedReduceSize          *int  // batched_reduce_size
	maxConcurrentShardRequests *int  // max_concurrent_shard_requests
	preFilterShardSize         *int  // pre_filter_shard_size
	restTotalHitsAsInt         *bool // rest_total_hits_as_int

	ccsMinimizeRoundtrips *bool // ccs_minimize_roundtrips

	waitForCompletionTimeout string // e.g. "1s"
	keepOnCompletion         *bool
	keepAlive                string // e.g. "1h"
}

// NewXPackAsyncSearchSubmit creates a new service for asynchronously
// searching in Elasticsearch.
func NewXPackAsyncSearchSubmit(client *Client) *XPackAsyncSearchSubmit {
	builder := &XPackAsyncSearchSubmit{
		client:       client,
		searchSource: NewSearchSource(),
	}
	return builder
}

// Pretty tells Elasticsearch whether to return a formatted JSON response.
func (s *XPackAsyncSearchSubmit) Pretty(pretty bool) *XPackAsyncSearchSubmit {
	s.pretty = &pretty
	return s
}

// Human specifies whether human readable values should be returned in
// the JSON response, e.g. "7.5mb".
func (s *XPackAsyncSearchSubmit) Human(human bool) *XPackAsyncSearchSubmit {
	s.human = &human
	return s
}

// ErrorTrace specifies whether to include the stack trace of returned errors.
func (s *XPackAsyncSearchSubmit) ErrorTrace(errorTrace bool) *XPackAsyncSearchSubmit {
	s.errorTrace = &errorTrace
	return s
}

// FilterPath specifies a list of filters used to reduce the response.
func (s *XPackAsyncSearchSubmit) FilterPath(filterPath ...string) *XPackAsyncSearchSubmit {
	s.filterPath = filterPath
	return s
}

// Header adds a header to the request.
func (s *XPackAsyncSearchSubmit) Header(name string, value string) *XPackAsyncSearchSubmit {
	if s.headers == nil {
		s.headers = http.Header{}
	}
	s.headers.Add(name, value)
	return s
}

// Headers specifies the headers of the request.
func (s *XPackAsyncSearchSubmit) Headers(headers http.Header) *XPackAsyncSearchSubmit {
	s.headers = headers
	return s
}

// SearchSource sets the search source builder to use with this service.
func (s *XPackAsyncSearchSubmit) SearchSource(searchSource *SearchSource) *XPackAsyncSearchSubmit {
	s.searchSource = searchSource
	if s.searchSource == nil {
		s.searchSource = NewSearchSource()
	}
	return s
}

// Source allows the user to set the request body manually without using
// any of the structs and interfaces in Elastic.
func (s *XPackAsyncSearchSubmit) Source(source interface{}) *XPackAsyncSearchSubmit {
	s.source = source
	return s
}

// Index sets the names of the indices to use for search.
func (s *XPackAsyncSearchSubmit) Index(index ...string) *XPackAsyncSearchSubmit {
	s.index = append(s.index, index...)
	return s
}

// Type adds search restrictions for a list of types.
//
// Deprecated: Types are in the process of being removed. Instead of using a type, prefer to
// filter on a field on the document.
func (s *XPackAsyncSearchSubmit) Type(typ ...string) *XPackAsyncSearchSubmit {
	s.typ = append(s.typ, typ...)
	return s
}

// Timeout sets the timeout to use, e.g. "1s" or "1000ms".
func (s *XPackAsyncSearchSubmit) Timeout(timeout string) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Timeout(timeout)
	return s
}

// Profile sets the Profile API flag on the search source.
// When enabled, a search executed by this service will return query
// profiling data.
func (s *XPackAsyncSearchSubmit) Profile(profile bool) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Profile(profile)
	return s
}

// Collapse adds field collapsing.
func (s *XPackAsyncSearchSubmit) Collapse(collapse *CollapseBuilder) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Collapse(collapse)
	return s
}

// TimeoutInMillis sets the timeout in milliseconds.
func (s *XPackAsyncSearchSubmit) TimeoutInMillis(timeoutInMillis int) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.TimeoutInMillis(timeoutInMillis)
	return s
}

// TerminateAfter specifies the maximum number of documents to collect for
// each shard, upon reaching which the query execution will terminate early.
func (s *XPackAsyncSearchSubmit) TerminateAfter(terminateAfter int) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.TerminateAfter(terminateAfter)
	return s
}

// SearchType sets the search operation type. Valid values are:
// "dfs_query_then_fetch" and "query_then_fetch".
// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/search-request-search-type.html
// for details.
func (s *XPackAsyncSearchSubmit) SearchType(searchType string) *XPackAsyncSearchSubmit {
	s.searchType = searchType
	return s
}

// Routing is a list of specific routing values to control the shards
// the search will be executed on.
func (s *XPackAsyncSearchSubmit) Routing(routings ...string) *XPackAsyncSearchSubmit {
	s.routing = strings.Join(routings, ",")
	return s
}

// Preference sets the preference to execute the search. Defaults to
// randomize across shards ("random"). Can be set to "_local" to prefer
// local shards, "_primary" to execute on primary shards only,
// or a custom value which guarantees that the same order will be used
// across different requests.
func (s *XPackAsyncSearchSubmit) Preference(preference string) *XPackAsyncSearchSubmit {
	s.preference = preference
	return s
}

// RequestCache indicates whether the cache should be used for this
// request or not, defaults to index level setting.
func (s *XPackAsyncSearchSubmit) RequestCache(requestCache bool) *XPackAsyncSearchSubmit {
	s.requestCache = &requestCache
	return s
}

// Query sets the query to perform, e.g. MatchAllQuery.
func (s *XPackAsyncSearchSubmit) Query(query Query) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Query(query)
	return s
}

// PostFilter will be executed after the query has been executed and
// only affects the search hits, not the aggregations.
// This filter is always executed as the last filtering mechanism.
func (s *XPackAsyncSearchSubmit) PostFilter(postFilter Query) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.PostFilter(postFilter)
	return s
}

// FetchSource indicates whether the response should contain the stored
// _source for every hit.
func (s *XPackAsyncSearchSubmit) FetchSource(fetchSource bool) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.FetchSource(fetchSource)
	return s
}

// FetchSourceContext indicates how the _source should be fetched.
func (s *XPackAsyncSearchSubmit) FetchSourceContext(fetchSourceContext *FetchSourceContext) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.FetchSourceContext(fetchSourceContext)
	return s
}

// Highlight adds highlighting to the search.
func (s *XPackAsyncSearchSubmit) Highlight(highlight *Highlight) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Highlight(highlight)
	return s
}

// GlobalSuggestText defines the global text to use with all suggesters.
// This avoids repetition.
func (s *XPackAsyncSearchSubmit) GlobalSuggestText(globalText string) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.GlobalSuggestText(globalText)
	return s
}

// Suggester adds a suggester to the search.
func (s *XPackAsyncSearchSubmit) Suggester(suggester Suggester) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Suggester(suggester)
	return s
}

// Aggregation adds an aggreation to perform as part of the search.
func (s *XPackAsyncSearchSubmit) Aggregation(name string, aggregation Aggregation) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Aggregation(name, aggregation)
	return s
}

// MinScore sets the minimum score below which docs will be filtered out.
func (s *XPackAsyncSearchSubmit) MinScore(minScore float64) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.MinScore(minScore)
	return s
}

// From index to start the search from. Defaults to 0.
func (s *XPackAsyncSearchSubmit) From(from int) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.From(from)
	return s
}

// Size is the number of search hits to return. Defaults to 10.
func (s *XPackAsyncSearchSubmit) Size(size int) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Size(size)
	return s
}

// Explain indicates whether each search hit should be returned with
// an explanation of the hit (ranking).
func (s *XPackAsyncSearchSubmit) Explain(explain bool) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Explain(explain)
	return s
}

// Version indicates whether each search hit should be returned with
// a version associated to it.
func (s *XPackAsyncSearchSubmit) Version(version bool) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Version(version)
	return s
}

// Sort adds a sort order.
func (s *XPackAsyncSearchSubmit) Sort(field string, ascending bool) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Sort(field, ascending)
	return s
}

// SortWithInfo adds a sort order.
func (s *XPackAsyncSearchSubmit) SortWithInfo(info SortInfo) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.SortWithInfo(info)
	return s
}

// SortBy adds a sort order.
func (s *XPackAsyncSearchSubmit) SortBy(sorter ...Sorter) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.SortBy(sorter...)
	return s
}

// DocvalueField adds a single field to load from the field data cache
// and return as part of the search.
func (s *XPackAsyncSearchSubmit) DocvalueField(docvalueField string) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.DocvalueField(docvalueField)
	return s
}

// DocvalueFieldWithFormat adds a single field to load from the field data cache
// and return as part of the search.
func (s *XPackAsyncSearchSubmit) DocvalueFieldWithFormat(docvalueField DocvalueField) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.DocvalueFieldWithFormat(docvalueField)
	return s
}

// DocvalueFields adds one or more fields to load from the field data cache
// and return as part of the search.
func (s *XPackAsyncSearchSubmit) DocvalueFields(docvalueFields ...string) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.DocvalueFields(docvalueFields...)
	return s
}

// DocvalueFieldsWithFormat adds one or more fields to load from the field data cache
// and return as part of the search.
func (s *XPackAsyncSearchSubmit) DocvalueFieldsWithFormat(docvalueFields ...DocvalueField) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.DocvalueFieldsWithFormat(docvalueFields...)
	return s
}

// NoStoredFields indicates that no stored fields should be loaded, resulting in only
// id and type to be returned per field.
func (s *XPackAsyncSearchSubmit) NoStoredFields() *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.NoStoredFields()
	return s
}

// StoredField adds a single field to load and return (note, must be stored) as
// part of the search request. If none are specified, the source of the
// document will be returned.
func (s *XPackAsyncSearchSubmit) StoredField(fieldName string) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.StoredField(fieldName)
	return s
}

// StoredFields	sets the fields to load and return as part of the search request.
// If none are specified, the source of the document will be returned.
func (s *XPackAsyncSearchSubmit) StoredFields(fields ...string) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.StoredFields(fields...)
	return s
}

// TrackScores is applied when sorting and controls if scores will be
// tracked as well. Defaults to false.
func (s *XPackAsyncSearchSubmit) TrackScores(trackScores bool) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.TrackScores(trackScores)
	return s
}

// TrackTotalHits controls if the total hit count for the query should be tracked.
//
// See https://www.elastic.co/guide/en/elasticsearch/reference/7.1/search-request-track-total-hits.html
// for details.
func (s *XPackAsyncSearchSubmit) TrackTotalHits(trackTotalHits interface{}) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.TrackTotalHits(trackTotalHits)
	return s
}

// SearchAfter allows a different form of pagination by using a live cursor,
// using the results of the previous page to help the retrieval of the next.
//
// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/search-request-search-after.html
func (s *XPackAsyncSearchSubmit) SearchAfter(sortValues ...interface{}) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.SearchAfter(sortValues...)
	return s
}

// DefaultRescoreWindowSize sets the rescore window size for rescores
// that don't specify their window.
func (s *XPackAsyncSearchSubmit) DefaultRescoreWindowSize(defaultRescoreWindowSize int) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.DefaultRescoreWindowSize(defaultRescoreWindowSize)
	return s
}

// Rescorer adds a rescorer to the search.
func (s *XPackAsyncSearchSubmit) Rescorer(rescore *Rescore) *XPackAsyncSearchSubmit {
	s.searchSource = s.searchSource.Rescorer(rescore)
	return s
}

// IgnoreUnavailable indicates whether the specified concrete indices
// should be ignored when unavailable (missing or closed).
func (s *XPackAsyncSearchSubmit) IgnoreUnavailable(ignoreUnavailable bool) *XPackAsyncSearchSubmit {
	s.ignoreUnavailable = &ignoreUnavailable
	return s
}

// IgnoreThrottled indicates whether specified concrete, expanded or aliased
// indices should be ignored when throttled.
func (s *XPackAsyncSearchSubmit) IgnoreThrottled(ignoreThrottled bool) *XPackAsyncSearchSubmit {
	s.ignoreThrottled = &ignoreThrottled
	return s
}

// AllowNoIndices indicates whether to ignore if a wildcard indices
// expression resolves into no concrete indices. (This includes `_all` string
// or when no indices have been specified).
func (s *XPackAsyncSearchSubmit) AllowNoIndices(allowNoIndices bool) *XPackAsyncSearchSubmit {
	s.allowNoIndices = &allowNoIndices
	return s
}

// ExpandWildcards indicates whether to expand wildcard expression to
// concrete indices that are open, closed or both.
func (s *XPackAsyncSearchSubmit) ExpandWildcards(expandWildcards string) *XPackAsyncSearchSubmit {
	s.expandWildcards = expandWildcards
	return s
}

// Lenient specifies whether format-based query failures (such as providing
// text to a numeric field) should be ignored.
func (s *XPackAsyncSearchSubmit) Lenient(lenient bool) *XPackAsyncSearchSubmit {
	s.lenient = &lenient
	return s
}

// MaxResponseSize sets an upper limit on the response body size that we accept,
// to guard against OOM situations.
func (s *XPackAsyncSearchSubmit) MaxResponseSize(maxResponseSize int64) *XPackAsyncSearchSubmit {
	s.maxResponseSize = maxResponseSize
	return s
}

// AllowPartialSearchResults indicates if an error should be returned if
// there is a partial search failure or timeout.
func (s *XPackAsyncSearchSubmit) AllowPartialSearchResults(enabled bool) *XPackAsyncSearchSubmit {
	s.allowPartialSearchResults = &enabled
	return s
}

// TypedKeys specifies whether aggregation and suggester names should be
// prefixed by their respective types in the response.
func (s *XPackAsyncSearchSubmit) TypedKeys(enabled bool) *XPackAsyncSearchSubmit {
	s.typedKeys = &enabled
	return s
}

// SeqNoPrimaryTerm specifies whether to return sequence number and
// primary term of the last modification of each hit.
func (s *XPackAsyncSearchSubmit) SeqNoPrimaryTerm(enabled bool) *XPackAsyncSearchSubmit {
	s.seqNoPrimaryTerm = &enabled
	return s
}

// BatchedReduceSize specifies the number of shard results that should be reduced
// at once on the coordinating node. This value should be used as a protection
// mechanism to reduce the memory overhead per search request if the potential
// number of shards in the request can be large.
func (s *XPackAsyncSearchSubmit) BatchedReduceSize(size int) *XPackAsyncSearchSubmit {
	s.batchedReduceSize = &size
	return s
}

// MaxConcurrentShardRequests specifies the number of concurrent shard requests
// this search executes concurrently. This value should be used to limit the
// impact of the search on the cluster in order to limit the number of
// concurrent shard requests.
func (s *XPackAsyncSearchSubmit) MaxConcurrentShardRequests(max int) *XPackAsyncSearchSubmit {
	s.maxConcurrentShardRequests = &max
	return s
}

// PreFilterShardSize specifies a threshold that enforces a pre-filter roundtrip
// to prefilter search shards based on query rewriting if the number of shards
// the search request expands to exceeds the threshold. This filter roundtrip
// can limit the number of shards significantly if for instance a shard can
// not match any documents based on it's rewrite method i.e. if date filters are
// mandatory to match but the shard bounds and the query are disjoint.
func (s *XPackAsyncSearchSubmit) PreFilterShardSize(threshold int) *XPackAsyncSearchSubmit {
	s.preFilterShardSize = &threshold
	return s
}

// RestTotalHitsAsInt indicates whether hits.total should be rendered as an
// integer or an object in the rest search response.
func (s *XPackAsyncSearchSubmit) RestTotalHitsAsInt(enabled bool) *XPackAsyncSearchSubmit {
	s.restTotalHitsAsInt = &enabled
	return s
}

// CCSMinimizeRoundtrips indicates whether network round-trips should be minimized
// as part of cross-cluster search requests execution.
func (s *XPackAsyncSearchSubmit) CCSMinimizeRoundtrips(enabled bool) *XPackAsyncSearchSubmit {
	s.ccsMinimizeRoundtrips = &enabled
	return s
}

// WaitForCompletionTimeout is suitable for DoAsync only. It specifies the
// timeout for the Search to wait for completion before returning an ID to
// return the results asynchronously. In other words: If the search takes
// longer than this value (default is 1 second), then you need to call
// GetAsync to retrieve its final results.
func (s *XPackAsyncSearchSubmit) WaitForCompletionTimeout(timeout string) *XPackAsyncSearchSubmit {
	s.waitForCompletionTimeout = timeout
	return s
}

// KeepOnCompletion is suitable for DoAsync only. It indicates whether the
// asynchronous search ID and its results should be kept even after the
// search (and its results) are completed and retrieved.
func (s *XPackAsyncSearchSubmit) KeepOnCompletion(keepOnCompletion bool) *XPackAsyncSearchSubmit {
	s.keepOnCompletion = &keepOnCompletion
	return s
}

// KeepAlive can only be used with DoAsync. If set, KeepAlive specifies the
// duration after which search ID and its results are removed from the
// Elasticsearch cluster and hence can no longer be retrieved with GetAsync.
func (s *XPackAsyncSearchSubmit) KeepAlive(keepAlive string) *XPackAsyncSearchSubmit {
	s.keepAlive = keepAlive
	return s
}

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

	if len(s.index) > 0 && len(s.typ) > 0 {
		path, err = uritemplates.Expand("/{index}/{type}/_async_search", map[string]string{
			"index": strings.Join(s.index, ","),
			"type":  strings.Join(s.typ, ","),
		})
	} else if len(s.index) > 0 {
		path, err = uritemplates.Expand("/{index}/_async_search", map[string]string{
			"index": strings.Join(s.index, ","),
		})
	} else if len(s.typ) > 0 {
		path, err = uritemplates.Expand("/_all/{type}/_async_search", map[string]string{
			"type": strings.Join(s.typ, ","),
		})
	} else {
		path = "/_async_search"
	}
	if err != nil {
		return "", url.Values{}, err
	}

	// Add query string parameters
	params := url.Values{}
	if v := s.pretty; v != nil {
		params.Set("pretty", fmt.Sprint(*v))
	}
	if v := s.human; v != nil {
		params.Set("human", fmt.Sprint(*v))
	}
	if v := s.errorTrace; v != nil {
		params.Set("error_trace", fmt.Sprint(*v))
	}
	if len(s.filterPath) > 0 {
		params.Set("filter_path", strings.Join(s.filterPath, ","))
	}
	if s.searchType != "" {
		params.Set("search_type", s.searchType)
	}
	if s.routing != "" {
		params.Set("routing", s.routing)
	}
	if s.preference != "" {
		params.Set("preference", s.preference)
	}
	if v := s.requestCache; v != nil {
		params.Set("request_cache", fmt.Sprint(*v))
	}
	if v := s.allowNoIndices; v != nil {
		params.Set("allow_no_indices", fmt.Sprint(*v))
	}
	if s.expandWildcards != "" {
		params.Set("expand_wildcards", s.expandWildcards)
	}
	if v := s.lenient; v != nil {
		params.Set("lenient", fmt.Sprint(*v))
	}
	if v := s.ignoreUnavailable; v != nil {
		params.Set("ignore_unavailable", fmt.Sprint(*v))
	}
	if v := s.ignoreThrottled; v != nil {
		params.Set("ignore_throttled", fmt.Sprint(*v))
	}
	if s.seqNoPrimaryTerm != nil {
		params.Set("seq_no_primary_term", fmt.Sprint(*s.seqNoPrimaryTerm))
	}
	if v := s.allowPartialSearchResults; v != nil {
		params.Set("allow_partial_search_results", fmt.Sprint(*v))
	}
	if v := s.typedKeys; v != nil {
		params.Set("typed_keys", fmt.Sprint(*v))
	}
	if v := s.batchedReduceSize; v != nil {
		params.Set("batched_reduce_size", fmt.Sprint(*v))
	}
	if v := s.maxConcurrentShardRequests; v != nil {
		params.Set("max_concurrent_shard_requests", fmt.Sprint(*v))
	}
	if v := s.preFilterShardSize; v != nil {
		params.Set("pre_filter_shard_size", fmt.Sprint(*v))
	}
	if v := s.restTotalHitsAsInt; v != nil {
		params.Set("rest_total_hits_as_int", fmt.Sprint(*v))
	}
	if v := s.ccsMinimizeRoundtrips; v != nil {
		params.Set("ccs_minimize_roundtrips", fmt.Sprint(*v))
	}
	if s.waitForCompletionTimeout != "" {
		params.Set("wait_for_completion_timeout", s.waitForCompletionTimeout)
	}
	if v := s.keepOnCompletion; v != nil {
		params.Set("keep_on_completion", fmt.Sprint(*v))
	}
	if s.keepAlive != "" {
		params.Set("keep_alive", s.keepAlive)
	}
	return path, params, nil
}

// Validate checks if the operation is valid.
func (s *XPackAsyncSearchSubmit) Validate() error {
	return nil
}

// Do executes the search and returns a XPackAsyncSearchResult.
func (s *XPackAsyncSearchSubmit) Do(ctx context.Context) (*XPackAsyncSearchResult, error) {
	// Check pre-conditions
	if err := s.Validate(); err != nil {
		return nil, err
	}

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

	// Perform request
	var body interface{}
	if s.source != nil {
		body = s.source
	} else {
		src, err := s.searchSource.Source()
		if err != nil {
			return nil, err
		}
		body = src
	}
	res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
		Method:          "POST",
		Path:            path,
		Params:          params,
		Body:            body,
		Headers:         s.headers,
		MaxResponseSize: s.maxResponseSize,
	})
	if err != nil {
		return nil, err
	}

	// Return search results
	ret := new(XPackAsyncSearchResult)
	if err := s.client.decoder.Decode(res.Body, ret); err != nil {
		ret.Header = res.Header
		return nil, err
	}
	ret.Header = res.Header
	return ret, nil
}

// XPackAsyncSearchResult is the outcome of starting an asynchronous search
// or retrieving a search result with XPackAsyncSearchGet.
type XPackAsyncSearchResult struct {
	Header               http.Header   `json:"-"`
	ID                   string        `json:"id,omitempty"`
	IsRunning            bool          `json:"is_running"`
	IsPartial            bool          `json:"is_partial"`
	StartTimeMillis      int64         `json:"start_time_in_millis,omitempty"`
	ExpirationTimeMillis int64         `json:"expiration_time_in_millis,omitempty"`
	Response             *SearchResult `json:"response,omitempty"`
	Error                *ErrorDetails `json:"error,omitempty"`
}

// Each is a utility function to iterate over all hits. It saves you from
// checking for nil values. Notice that Each will ignore errors in
// serializing JSON and hits with empty/nil _source will get an empty
// value
func (r *XPackAsyncSearchResult) Each(typ reflect.Type) []interface{} {
	if r == nil || r.Response == nil || r.Response.Hits == nil || r.Response.Hits.Hits == nil || len(r.Response.Hits.Hits) == 0 {
		return nil
	}
	var slice []interface{}
	for _, hit := range r.Response.Hits.Hits {
		v := reflect.New(typ).Elem()
		if hit.Source == nil {
			slice = append(slice, v.Interface())
			continue
		}
		if err := json.Unmarshal(hit.Source, v.Addr().Interface()); err == nil {
			slice = append(slice, v.Interface())
		}
	}
	return slice
}
