1// Copyright 2012-2015 Oliver Eilhard. All rights reserved.
2// Use of this source code is governed by a MIT-license.
3// See http://olivere.mit-license.org/license.txt for details.
4
5package elastic
6
7import (
8	"encoding/json"
9)
10
11// SuggestField can be used by the caller to specify a suggest field
12// at index time. For a detailed example, see e.g.
13// http://www.elasticsearch.org/blog/you-complete-me/.
14type SuggestField struct {
15	inputs  []string
16	output  *string
17	payload interface{}
18	weight  int
19}
20
21func NewSuggestField() *SuggestField {
22	return &SuggestField{weight: -1}
23}
24
25func (f *SuggestField) Input(input ...string) *SuggestField {
26	if f.inputs == nil {
27		f.inputs = make([]string, 0)
28	}
29	f.inputs = append(f.inputs, input...)
30	return f
31}
32
33func (f *SuggestField) Output(output string) *SuggestField {
34	f.output = &output
35	return f
36}
37
38func (f *SuggestField) Payload(payload interface{}) *SuggestField {
39	f.payload = payload
40	return f
41}
42
43func (f *SuggestField) Weight(weight int) *SuggestField {
44	f.weight = weight
45	return f
46}
47
48// MarshalJSON encodes SuggestField into JSON.
49func (f *SuggestField) MarshalJSON() ([]byte, error) {
50	source := make(map[string]interface{})
51
52	if f.inputs != nil {
53		switch len(f.inputs) {
54		case 1:
55			source["input"] = f.inputs[0]
56		default:
57			source["input"] = f.inputs
58		}
59	}
60
61	if f.output != nil {
62		source["output"] = *f.output
63	}
64
65	if f.payload != nil {
66		source["payload"] = f.payload
67	}
68
69	if f.weight >= 0 {
70		source["weight"] = f.weight
71	}
72
73	return json.Marshal(source)
74}
75