//  Copyright (c) 2017 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 scorch

import (
	"reflect"
	"testing"

	"github.com/blevesearch/bleve/v2/document"
	index "github.com/blevesearch/bleve_index_api"
)

func TestIndexFieldDict(t *testing.T) {
	cfg := CreateConfig("TestIndexFieldDict")
	err := InitTest(cfg)
	if err != nil {
		t.Fatal(err)
	}
	defer func() {
		err := DestroyTest(cfg)
		if err != nil {
			t.Log(err)
		}
	}()

	analysisQueue := index.NewAnalysisQueue(1)
	idx, err := NewScorch(Name, cfg, analysisQueue)
	if err != nil {
		t.Fatal(err)
	}
	err = idx.Open()
	if err != nil {
		t.Fatalf("error opening index: %v", err)
	}
	defer func() {
		cerr := idx.Close()
		if cerr != nil {
			t.Fatal(cerr)
		}
	}()

	doc := document.NewDocument("1")
	doc.AddField(document.NewTextField("name", []uint64{}, []byte("test")))
	err = idx.Update(doc)
	if err != nil {
		t.Errorf("Error updating index: %v", err)
	}

	doc = document.NewDocument("2")
	doc.AddField(document.NewTextFieldWithAnalyzer("name", []uint64{}, []byte("test test test"), testAnalyzer))
	doc.AddField(document.NewTextFieldCustom("desc", []uint64{}, []byte("eat more rice"), index.IndexField|index.IncludeTermVectors, testAnalyzer))
	doc.AddField(document.NewTextFieldCustom("prefix", []uint64{}, []byte("bob cat cats catting dog doggy zoo"), index.IndexField|index.IncludeTermVectors, testAnalyzer))
	err = idx.Update(doc)
	if err != nil {
		t.Errorf("Error updating index: %v", err)
	}

	indexReader, err := idx.Reader()
	if err != nil {
		t.Error(err)
	}
	defer func() {
		err := indexReader.Close()
		if err != nil {
			t.Fatal(err)
		}
	}()

	dict, err := indexReader.FieldDict("name")
	if err != nil {
		t.Errorf("error creating reader: %v", err)
	}
	defer func() {
		err := dict.Close()
		if err != nil {
			t.Fatal(err)
		}
	}()

	termCount := 0
	curr, err := dict.Next()
	for err == nil && curr != nil {
		termCount++
		if curr.Term != "test" {
			t.Errorf("expected term to be 'test', got '%s'", curr.Term)
		}
		curr, err = dict.Next()
	}
	if termCount != 1 {
		t.Errorf("expected 1 term for this field, got %d", termCount)
	}

	dict2, err := indexReader.FieldDict("desc")
	if err != nil {
		t.Fatalf("error creating reader: %v", err)
	}
	defer func() {
		err := dict2.Close()
		if err != nil {
			t.Fatal(err)
		}
	}()

	termCount = 0
	terms := make([]string, 0)
	curr, err = dict2.Next()
	for err == nil && curr != nil {
		termCount++
		terms = append(terms, curr.Term)
		curr, err = dict2.Next()
	}
	if termCount != 3 {
		t.Errorf("expected 3 term for this field, got %d", termCount)
	}
	expectedTerms := []string{"eat", "more", "rice"}
	if !reflect.DeepEqual(expectedTerms, terms) {
		t.Errorf("expected %#v, got %#v", expectedTerms, terms)
	}
	// test start and end range
	dict3, err := indexReader.FieldDictRange("desc", []byte("fun"), []byte("nice"))
	if err != nil {
		t.Errorf("error creating reader: %v", err)
	}
	defer func() {
		err := dict3.Close()
		if err != nil {
			t.Fatal(err)
		}
	}()

	termCount = 0
	terms = make([]string, 0)
	curr, err = dict3.Next()
	for err == nil && curr != nil {
		termCount++
		terms = append(terms, curr.Term)
		curr, err = dict3.Next()
	}
	if termCount != 1 {
		t.Errorf("expected 1 term for this field, got %d", termCount)
	}
	expectedTerms = []string{"more"}
	if !reflect.DeepEqual(expectedTerms, terms) {
		t.Errorf("expected %#v, got %#v", expectedTerms, terms)
	}

	// test use case for prefix
	dict4, err := indexReader.FieldDictPrefix("prefix", []byte("cat"))
	if err != nil {
		t.Errorf("error creating reader: %v", err)
	}
	defer func() {
		err := dict4.Close()
		if err != nil {
			t.Fatal(err)
		}
	}()

	termCount = 0
	terms = make([]string, 0)
	curr, err = dict4.Next()
	for err == nil && curr != nil {
		termCount++
		terms = append(terms, curr.Term)
		curr, err = dict4.Next()
	}
	if termCount != 3 {
		t.Errorf("expected 3 term for this field, got %d", termCount)
	}
	expectedTerms = []string{"cat", "cats", "catting"}
	if !reflect.DeepEqual(expectedTerms, terms) {
		t.Errorf("expected %#v, got %#v", expectedTerms, terms)
	}
}
