// 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

// A filter that filters out matched documents using a query. Can be placed
// within queries that accept a filter.
// For details, see:
// http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-not-filter.html#query-dsl-not-filter.
type NotFilter struct {
	filter     Filter
	cache      *bool
	cacheKey   string
	filterName string
}

func NewNotFilter(filter Filter) NotFilter {
	return NotFilter{
		filter: filter,
	}
}

func (f NotFilter) Cache(cache bool) NotFilter {
	f.cache = &cache
	return f
}

func (f NotFilter) CacheKey(cacheKey string) NotFilter {
	f.cacheKey = cacheKey
	return f
}

func (f NotFilter) FilterName(filterName string) NotFilter {
	f.filterName = filterName
	return f
}

func (f NotFilter) Source() interface{} {
	// {
	//   "not" : {
	//      "filter" : { ... }
	//   }
	// }

	source := make(map[string]interface{})

	params := make(map[string]interface{})
	source["not"] = params
	params["filter"] = f.filter.Source()

	if f.cache != nil {
		params["_cache"] = *f.cache
	}
	if f.cacheKey != "" {
		params["_cache_key"] = f.cacheKey
	}
	if f.filterName != "" {
		params["_name"] = f.filterName
	}
	return source
}