//  Copyright (c) 2014 Couchbase, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 		http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package bleve

import (
	"fmt"
	"os"
	"testing"
	"time"

	"github.com/blevesearch/bleve/v2/mapping"
	"github.com/blevesearch/bleve/v2/search"
	"github.com/blevesearch/bleve/v2/search/highlight/highlighter/ansi"
)

var indexMapping mapping.IndexMapping
var exampleIndex Index
var err error

func TestMain(m *testing.M) {
	err = os.RemoveAll("path_to_index")
	if err != nil {
		panic(err)
	}
	toRun := m.Run()
	if exampleIndex != nil {
		err = exampleIndex.Close()
		if err != nil {
			panic(err)
		}
	}
	err = os.RemoveAll("path_to_index")
	if err != nil {
		panic(err)
	}
	os.Exit(toRun)
}

func ExampleNew() {
	indexMapping = NewIndexMapping()
	exampleIndex, err = New("path_to_index", indexMapping)
	if err != nil {
		panic(err)
	}
	count, err := exampleIndex.DocCount()
	if err != nil {
		panic(err)
	}

	fmt.Println(count)
	// Output:
	// 0
}

func ExampleIndex_indexing() {
	data := struct {
		Name    string
		Created time.Time
		Age     int
	}{Name: "named one", Created: time.Now(), Age: 50}
	data2 := struct {
		Name    string
		Created time.Time
		Age     int
	}{Name: "great nameless one", Created: time.Now(), Age: 25}

	// index some data
	err = exampleIndex.Index("document id 1", data)
	if err != nil {
		panic(err)
	}
	err = exampleIndex.Index("document id 2", data2)
	if err != nil {
		panic(err)
	}

	// 2 documents have been indexed
	count, err := exampleIndex.DocCount()
	if err != nil {
		panic(err)
	}

	fmt.Println(count)
	// Output:
	// 2
}

// Examples for query related functions

func ExampleNewMatchQuery() {
	// finds documents with fields fully matching the given query text
	query := NewMatchQuery("named one")
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	// Output:
	// document id 1
}

func ExampleNewMatchAllQuery() {
	// finds all documents in the index
	query := NewMatchAllQuery()
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(len(searchResults.Hits))
	// Output:
	// 2
}

func ExampleNewMatchNoneQuery() {
	// matches no documents in the index
	query := NewMatchNoneQuery()
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(len(searchResults.Hits))
	// Output:
	// 0
}

func ExampleNewMatchPhraseQuery() {
	// finds all documents with the given phrase in the index
	query := NewMatchPhraseQuery("nameless one")
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	// Output:
	// document id 2
}

func ExampleNewNumericRangeQuery() {
	value1 := float64(11)
	value2 := float64(100)
	data := struct{ Priority float64 }{Priority: float64(15)}
	data2 := struct{ Priority float64 }{Priority: float64(10)}

	err = exampleIndex.Index("document id 3", data)
	if err != nil {
		panic(err)
	}
	err = exampleIndex.Index("document id 4", data2)
	if err != nil {
		panic(err)
	}

	query := NewNumericRangeQuery(&value1, &value2)
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	// Output:
	// document id 3
}

func ExampleNewNumericRangeInclusiveQuery() {
	value1 := float64(10)
	value2 := float64(100)
	v1incl := false
	v2incl := false

	query := NewNumericRangeInclusiveQuery(&value1, &value2, &v1incl, &v2incl)
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	// Output:
	// document id 3
}

func ExampleNewPhraseQuery() {
	// finds all documents with the given phrases in the given field in the index
	query := NewPhraseQuery([]string{"nameless", "one"}, "Name")
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	// Output:
	// document id 2
}

func ExampleNewPrefixQuery() {
	// finds all documents with terms having the given prefix in the index
	query := NewPrefixQuery("name")
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(len(searchResults.Hits))
	// Output:
	// 2
}

func ExampleNewQueryStringQuery() {
	query := NewQueryStringQuery("+one -great")
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	// Output:
	// document id 1
}

func ExampleNewTermQuery() {
	query := NewTermQuery("great")
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	// Output:
	// document id 2
}

func ExampleNewFacetRequest() {
	facet := NewFacetRequest("Name", 1)
	query := NewMatchAllQuery()
	searchRequest := NewSearchRequest(query)
	searchRequest.AddFacet("facet name", facet)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	// total number of terms
	fmt.Println(searchResults.Facets["facet name"].Total)
	// number of docs with no value for this field
	fmt.Println(searchResults.Facets["facet name"].Missing)
	// term with highest occurrences in field name
	fmt.Println(searchResults.Facets["facet name"].Terms.Terms()[0].Term)
	// Output:
	// 5
	// 2
	// one
}

func ExampleFacetRequest_AddDateTimeRange() {
	facet := NewFacetRequest("Created", 1)
	facet.AddDateTimeRange("range name", time.Unix(0, 0), time.Now())
	query := NewMatchAllQuery()
	searchRequest := NewSearchRequest(query)
	searchRequest.AddFacet("facet name", facet)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	// dates in field Created since starting of unix time till now
	fmt.Println(searchResults.Facets["facet name"].DateRanges[0].Count)
	// Output:
	// 2
}

func ExampleFacetRequest_AddNumericRange() {
	value1 := float64(11)

	facet := NewFacetRequest("Priority", 1)
	facet.AddNumericRange("range name", &value1, nil)
	query := NewMatchAllQuery()
	searchRequest := NewSearchRequest(query)
	searchRequest.AddFacet("facet name", facet)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	// number documents with field Priority in the given range
	fmt.Println(searchResults.Facets["facet name"].NumericRanges[0].Count)
	// Output:
	// 1
}

func ExampleNewHighlight() {
	query := NewMatchQuery("nameless")
	searchRequest := NewSearchRequest(query)
	searchRequest.Highlight = NewHighlight()
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].Fragments["Name"][0])
	// Output:
	// great <mark>nameless</mark> one
}

func ExampleNewHighlightWithStyle() {
	query := NewMatchQuery("nameless")
	searchRequest := NewSearchRequest(query)
	searchRequest.Highlight = NewHighlightWithStyle(ansi.Name)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].Fragments["Name"][0])
	// Output:
	// great nameless one
}

func ExampleSearchRequest_AddFacet() {
	facet := NewFacetRequest("Name", 1)
	query := NewMatchAllQuery()
	searchRequest := NewSearchRequest(query)
	searchRequest.AddFacet("facet name", facet)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	// total number of terms
	fmt.Println(searchResults.Facets["facet name"].Total)
	// number of docs with no value for this field
	fmt.Println(searchResults.Facets["facet name"].Missing)
	// term with highest occurrences in field name
	fmt.Println(searchResults.Facets["facet name"].Terms.Terms()[0].Term)
	// Output:
	// 5
	// 2
	// one
}

func ExampleNewSearchRequest() {
	// finds documents with fields fully matching the given query text
	query := NewMatchQuery("named one")
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	// Output:
	// document id 1
}

func ExampleNewBooleanQuery() {
	must := NewMatchQuery("one")
	mustNot := NewMatchQuery("great")
	query := NewBooleanQuery()
	query.AddMust(must)
	query.AddMustNot(mustNot)
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	// Output:
	// document id 1
}

func ExampleNewConjunctionQuery() {
	conjunct1 := NewMatchQuery("great")
	conjunct2 := NewMatchQuery("one")
	query := NewConjunctionQuery(conjunct1, conjunct2)
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	// Output:
	// document id 2
}

func ExampleNewDisjunctionQuery() {
	disjunct1 := NewMatchQuery("great")
	disjunct2 := NewMatchQuery("named")
	query := NewDisjunctionQuery(disjunct1, disjunct2)
	searchRequest := NewSearchRequest(query)
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(len(searchResults.Hits))
	// Output:
	// 2
}

func ExampleSearchRequest_SortBy() {
	// find docs containing "one", order by Age instead of score
	query := NewMatchQuery("one")
	searchRequest := NewSearchRequest(query)
	searchRequest.SortBy([]string{"Age"})
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	fmt.Println(searchResults.Hits[1].ID)
	// Output:
	// document id 2
	// document id 1
}

func ExampleSearchRequest_SortByCustom() {
	// find all docs, order by Age, with docs missing Age field first
	query := NewMatchAllQuery()
	searchRequest := NewSearchRequest(query)
	searchRequest.SortByCustom(search.SortOrder{
		&search.SortField{
			Field:   "Age",
			Missing: search.SortFieldMissingFirst,
		},
		&search.SortDocID{},
	})
	searchResults, err := exampleIndex.Search(searchRequest)
	if err != nil {
		panic(err)
	}

	fmt.Println(searchResults.Hits[0].ID)
	fmt.Println(searchResults.Hits[1].ID)
	fmt.Println(searchResults.Hits[2].ID)
	fmt.Println(searchResults.Hits[3].ID)
	// Output:
	// document id 3
	// document id 4
	// document id 2
	// document id 1
}