package meta

import (
	"crypto/rand"
	"testing"

	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
	"github.com/stretchr/testify/require"
)

func addNFilters(fs *objectSDK.SearchFilters, n int) {
	for i := 0; i < n; i++ {
		key := make([]byte, 32)
		rand.Read(key)

		val := make([]byte, 32)
		rand.Read(val)

		fs.AddFilter(string(key), string(val), objectSDK.MatchStringEqual)
	}
}

func BenchmarkDB_Select(b *testing.B) {
	db := newDB(b)

	defer releaseDB(db)

	for i := 0; i < 100; i++ {
		obj := generateObject(b, testPrm{
			withParent: true,
			attrNum:    100,
		})

		require.NoError(b, db.Put(obj))
	}

	for _, item := range []struct {
		name    string
		filters func(*objectSDK.SearchFilters)
	}{
		{
			name: "empty",
			filters: func(*objectSDK.SearchFilters) {
				return
			},
		},
		{
			name: "1 filter",
			filters: func(fs *objectSDK.SearchFilters) {
				addNFilters(fs, 1)
			},
		},
		{
			name: "10 filters",
			filters: func(fs *objectSDK.SearchFilters) {
				addNFilters(fs, 10)
			},
		},
		{
			name: "100 filters",
			filters: func(fs *objectSDK.SearchFilters) {
				addNFilters(fs, 100)
			},
		},
		{
			name: "1000 filters",
			filters: func(fs *objectSDK.SearchFilters) {
				addNFilters(fs, 1000)
			},
		},
	} {
		b.Run(item.name, func(b *testing.B) {
			b.ReportAllocs()
			b.ResetTimer()

			for i := 0; i < b.N; i++ {
				b.StopTimer()
				fs := new(objectSDK.SearchFilters)
				item.filters(fs)
				b.StartTimer()

				_, err := db.Select(*fs)

				b.StopTimer()
				require.NoError(b, err)
				b.StartTimer()
			}
		})
	}
}