//  Copyright (c) 2013 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 searcher

import (
	"reflect"
	"testing"

	"github.com/blevesearch/bleve/index"
	"github.com/blevesearch/bleve/search"
)

func TestPhraseSearch(t *testing.T) {

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

	soptions := search.SearcherOptions{Explain: true, IncludeTermVectors: true}

	angstTermSearcher, err := NewTermSearcher(twoDocIndexReader, "angst", "desc", 1.0, soptions)
	if err != nil {
		t.Fatal(err)
	}
	beerTermSearcher, err := NewTermSearcher(twoDocIndexReader, "beer", "desc", 1.0, soptions)
	if err != nil {
		t.Fatal(err)
	}
	mustSearcher, err := NewConjunctionSearcher(twoDocIndexReader, []search.Searcher{angstTermSearcher, beerTermSearcher}, soptions)
	if err != nil {
		t.Fatal(err)
	}
	phraseSearcher, err := NewPhraseSearcher(twoDocIndexReader, mustSearcher, []string{"angst", "beer"})
	if err != nil {
		t.Fatal(err)
	}

	tests := []struct {
		searcher   search.Searcher
		results    []*search.DocumentMatch
		locations  map[string]map[string][]search.Location
		fieldterms [][2]string
	}{
		{
			searcher: phraseSearcher,
			results: []*search.DocumentMatch{
				{
					IndexInternalID: index.IndexInternalID("2"),
					Score:           1.0807601687084403,
				},
			},
			locations:  map[string]map[string][]search.Location{"desc": map[string][]search.Location{"beer": []search.Location{search.Location{Pos: 2, Start: 6, End: 10, ArrayPositions: []float64(nil)}}, "angst": []search.Location{search.Location{Pos: 1, Start: 0, End: 5, ArrayPositions: []float64(nil)}}}},
			fieldterms: [][2]string{[2]string{"desc", "beer"}, [2]string{"desc", "angst"}},
		},
	}

	for testIndex, test := range tests {
		defer func() {
			err := test.searcher.Close()
			if err != nil {
				t.Fatal(err)
			}
		}()

		ctx := &search.SearchContext{
			DocumentMatchPool: search.NewDocumentMatchPool(test.searcher.DocumentMatchPoolSize(), 0),
		}
		next, err := test.searcher.Next(ctx)
		i := 0
		for err == nil && next != nil {
			if i < len(test.results) {
				if !next.IndexInternalID.Equals(test.results[i].IndexInternalID) {
					t.Errorf("expected result %d to have id %s got %s for test %d\n", i, test.results[i].IndexInternalID, next.IndexInternalID, testIndex)
				}
				if next.Score != test.results[i].Score {
					t.Errorf("expected result %d to have score %v got %v for test %d\n", i, test.results[i].Score, next.Score, testIndex)
					t.Logf("scoring explanation: %s\n", next.Expl)
				}
				for _, ft := range test.fieldterms {
					locs := next.Locations[ft[0]][ft[1]]
					explocs := test.locations[ft[0]][ft[1]]
					if len(explocs) != len(locs) {
						t.Fatalf("expected result %d to have %d Locations (%#v) but got %d (%#v) for test %d with field %q and term %q\n", i, len(explocs), explocs, len(locs), locs, testIndex, ft[0], ft[1])
					}
					for ind, exploc := range explocs {
						if !reflect.DeepEqual(*locs[ind], exploc) {
							t.Errorf("expected result %d to have Location %v got %v for test %d\n", i, exploc, locs[ind], testIndex)
						}
					}
				}
			}

			ctx.DocumentMatchPool.Put(next)
			next, err = test.searcher.Next(ctx)
			i++
		}
		if err != nil {
			t.Fatalf("error iterating searcher: %v for test %d", err, testIndex)
		}
		if len(test.results) != i {
			t.Errorf("expected %d results got %d for test %d", len(test.results), i, testIndex)
		}
	}
}