// Copyright 2012-2015 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 (
	"fmt"
	"strings"
)

// SearchRequest combines a search request and its
// query details (see SearchSource).
// It is used in combination with MultiSearch.
type SearchRequest struct {
	searchType   string // default in ES is "query_then_fetch"
	indices      []string
	types        []string
	routing      *string
	preference   *string
	requestCache *bool
	scroll       string
	source       interface{}
}

// NewSearchRequest creates a new search request.
func NewSearchRequest() *SearchRequest {
	return &SearchRequest{
		indices: make([]string, 0),
		types:   make([]string, 0),
	}
}

// SearchRequest must be one of "query_then_fetch", "query_and_fetch",
// "scan", "count", "dfs_query_then_fetch", or "dfs_query_and_fetch".
// Use one of the constants defined via SearchType.
func (r *SearchRequest) SearchType(searchType string) *SearchRequest {
	r.searchType = searchType
	return r
}

func (r *SearchRequest) SearchTypeDfsQueryThenFetch() *SearchRequest {
	return r.SearchType("dfs_query_then_fetch")
}

func (r *SearchRequest) SearchTypeDfsQueryAndFetch() *SearchRequest {
	return r.SearchType("dfs_query_and_fetch")
}

func (r *SearchRequest) SearchTypeQueryThenFetch() *SearchRequest {
	return r.SearchType("query_then_fetch")
}

func (r *SearchRequest) SearchTypeQueryAndFetch() *SearchRequest {
	return r.SearchType("query_and_fetch")
}

func (r *SearchRequest) SearchTypeScan() *SearchRequest {
	return r.SearchType("scan")
}

func (r *SearchRequest) SearchTypeCount() *SearchRequest {
	return r.SearchType("count")
}

func (r *SearchRequest) Index(indices ...string) *SearchRequest {
	r.indices = append(r.indices, indices...)
	return r
}

func (r *SearchRequest) HasIndices() bool {
	return len(r.indices) > 0
}

func (r *SearchRequest) Type(types ...string) *SearchRequest {
	r.types = append(r.types, types...)
	return r
}

func (r *SearchRequest) Routing(routing string) *SearchRequest {
	r.routing = &routing
	return r
}

func (r *SearchRequest) Routings(routings ...string) *SearchRequest {
	if routings != nil {
		routings := strings.Join(routings, ",")
		r.routing = &routings
	} else {
		r.routing = nil
	}
	return r
}

func (r *SearchRequest) Preference(preference string) *SearchRequest {
	r.preference = &preference
	return r
}

func (r *SearchRequest) RequestCache(requestCache bool) *SearchRequest {
	r.requestCache = &requestCache
	return r
}

func (r *SearchRequest) Scroll(scroll string) *SearchRequest {
	r.scroll = scroll
	return r
}

func (r *SearchRequest) SearchSource(searchSource *SearchSource) *SearchRequest {
	return r.Source(searchSource)
}

func (r *SearchRequest) Source(source interface{}) *SearchRequest {
	switch v := source.(type) {
	case *SearchSource:
		src, err := v.Source()
		if err != nil {
			// Do not do anything in case of an error
			return r
		}
		r.source = src
	default:
		r.source = source
	}
	return r
}

// header is used e.g. by MultiSearch to get information about the search header
// of one SearchRequest.
// See http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-multi-search.html
func (r *SearchRequest) header() interface{} {
	h := make(map[string]interface{})
	if r.searchType != "" {
		h["search_type"] = r.searchType
	}

	switch len(r.indices) {
	case 0:
	case 1:
		h["index"] = r.indices[0]
	default:
		h["indices"] = r.indices
	}

	switch len(r.types) {
	case 0:
	case 1:
		h["type"] = r.types[0]
	default:
		h["types"] = r.types
	}

	if r.routing != nil && *r.routing != "" {
		h["routing"] = *r.routing
	}

	if r.preference != nil && *r.preference != "" {
		h["preference"] = *r.preference
	}

	if r.requestCache != nil {
		h["request_cache"] = fmt.Sprintf("%v", *r.requestCache)
	}

	if r.scroll != "" {
		h["scroll"] = r.scroll
	}

	return h
}

// body is used by MultiSearch to get information about the search body
// of one SearchRequest.
// See http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-multi-search.html
func (r *SearchRequest) body() interface{} {
	return r.source
}