package engine

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"sort"
	"testing"

	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/core/object"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/testutil"
	meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/pilorama"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
	"github.com/stretchr/testify/require"
	"go.uber.org/zap"
)

func sortAddresses(addrWithType []object.AddressWithType) []object.AddressWithType {
	sort.Slice(addrWithType, func(i, j int) bool {
		return addrWithType[i].Address.EncodeToString() < addrWithType[j].Address.EncodeToString()
	})
	return addrWithType
}

func TestListWithCursor(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name      string
		shardNum  int
		objectNum int
		batchSize uint32
	}{
		{
			name:      "one shard, few objects, small batch size",
			shardNum:  1,
			objectNum: 2,
			batchSize: 1,
		},
		{
			name:      "one shard, many objects, big batch size",
			shardNum:  1,
			objectNum: 53,
			batchSize: 100,
		},
		{
			name:      "many shards, many objects, small batch size",
			shardNum:  6,
			objectNum: 66,
			batchSize: 1,
		},
		{
			name:      "many shards, many objects, big batch size",
			shardNum:  6,
			objectNum: 99,
			batchSize: 100,
		},
	}
	for i := range tests {
		tt := tests[i]
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			e := testNewEngine(t).setShardsNumOpts(t, tt.shardNum, func(id int) []shard.Option {
				return []shard.Option{
					shard.WithLogger(&logger.Logger{Logger: zap.L()}),
					shard.WithBlobStorOptions(
						blobstor.WithStorages(
							newStorages(filepath.Join(t.Name(), tt.name, fmt.Sprintf("%d.blobstor", id)),
								1<<20))),
					shard.WithPiloramaOptions(pilorama.WithPath(filepath.Join(t.Name(), tt.name, fmt.Sprintf("%d.pilorama", id)))),
					shard.WithMetaBaseOptions(
						meta.WithPath(filepath.Join(t.Name(), tt.name, fmt.Sprintf("%d.metabase", id))),
						meta.WithPermissions(0700),
						meta.WithEpochState(epochState{}),
					)}
			}).engine
			require.NoError(t, e.Open())
			require.NoError(t, e.Init(context.Background()))

			t.Cleanup(func() {
				e.Close()
				os.RemoveAll(t.Name())
			})

			expected := make([]object.AddressWithType, 0, tt.objectNum)
			got := make([]object.AddressWithType, 0, tt.objectNum)

			for i := 0; i < tt.objectNum; i++ {
				containerID := cidtest.ID()
				obj := testutil.GenerateObjectWithCIDWithPayload(containerID, []byte{'a'})

				var prm PutPrm
				prm.WithObject(obj)

				err := e.Put(context.Background(), prm)
				require.NoError(t, err)
				expected = append(expected, object.AddressWithType{Type: objectSDK.TypeRegular, Address: object.AddressOf(obj)})
			}
			expected = sortAddresses(expected)

			var prm ListWithCursorPrm
			prm.count = tt.batchSize
			for {
				res, err := e.ListWithCursor(context.Background(), prm)
				if err == ErrEndOfListing {
					require.Empty(t, res.AddressList())
					break
				}
				require.NotEmpty(t, res.AddressList())
				got = append(got, res.AddressList()...)
				prm.cursor = res.Cursor()
			}

			got = sortAddresses(got)
			require.Equal(t, expected, got)
		})
	}
}