package shard

import (
	"context"
	"path/filepath"
	"testing"
	"time"

	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/blobovniczatree"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/fstree"
	meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/pilorama"
	writecacheconfig "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/writecache/config"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/writecache/writecachebadger"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/writecache/writecachebbolt"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger/test"
	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
	"github.com/panjf2000/ants/v2"
	"github.com/stretchr/testify/require"
)

type epochState struct {
	Value uint64
}

func (s epochState) CurrentEpoch() uint64 {
	return s.Value
}

func newShard(t testing.TB, enableWriteCache bool) *Shard {
	sh := newCustomShard(t, t.TempDir(), enableWriteCache,
		writecacheconfig.Options{Type: writecacheconfig.TypeBBolt},
		nil,
		nil)
	t.Cleanup(func() { releaseShard(sh, t) })
	return sh
}

func newCustomShard(t testing.TB, rootPath string, enableWriteCache bool, wcOpts writecacheconfig.Options, bsOpts []blobstor.Option, metaOptions []meta.Option) *Shard {
	var sh *Shard
	if enableWriteCache {
		rootPath = filepath.Join(rootPath, "wc")
		switch wcOpts.Type {
		case writecacheconfig.TypeBBolt:
			wcOpts.BBoltOptions = append(
				[]writecachebbolt.Option{writecachebbolt.WithPath(filepath.Join(rootPath, "wcache"))},
				wcOpts.BBoltOptions...)
		case writecacheconfig.TypeBadger:
			wcOpts.BadgerOptions = append(
				[]writecachebadger.Option{writecachebadger.WithPath(filepath.Join(rootPath, "wcache"))},
				wcOpts.BadgerOptions...)
		}
	} else {
		rootPath = filepath.Join(rootPath, "nowc")
	}

	if bsOpts == nil {
		bsOpts = []blobstor.Option{
			blobstor.WithLogger(test.NewLogger(t, true)),
			blobstor.WithStorages([]blobstor.SubStorage{
				{
					Storage: blobovniczatree.NewBlobovniczaTree(
						blobovniczatree.WithLogger(test.NewLogger(t, true)),
						blobovniczatree.WithRootPath(filepath.Join(rootPath, "blob", "blobovnicza")),
						blobovniczatree.WithBlobovniczaShallowDepth(1),
						blobovniczatree.WithBlobovniczaShallowWidth(1)),
					Policy: func(_ *objectSDK.Object, data []byte) bool {
						return len(data) <= 1<<20
					},
				},
				{
					Storage: fstree.New(
						fstree.WithPath(filepath.Join(rootPath, "blob"))),
				},
			}),
		}
	}

	opts := []Option{
		WithID(NewIDFromBytes([]byte{})),
		WithLogger(test.NewLogger(t, true)),
		WithBlobStorOptions(bsOpts...),
		WithMetaBaseOptions(
			append([]meta.Option{
				meta.WithPath(filepath.Join(rootPath, "meta")), meta.WithEpochState(epochState{})},
				metaOptions...)...,
		),
		WithPiloramaOptions(pilorama.WithPath(filepath.Join(rootPath, "pilorama"))),
		WithWriteCache(enableWriteCache),
		WithWriteCacheOptions(wcOpts),
		WithDeletedLockCallback(func(_ context.Context, addresses []oid.Address) {
			sh.HandleDeletedLocks(addresses)
		}),
		WithExpiredLocksCallback(func(ctx context.Context, epoch uint64, a []oid.Address) {
			sh.HandleExpiredLocks(ctx, epoch, a)
		}),
		WithGCWorkerPoolInitializer(func(sz int) util.WorkerPool {
			pool, err := ants.NewPool(sz)
			require.NoError(t, err)
			return pool
		}),
		WithGCRemoverSleepInterval(100 * time.Millisecond),
	}

	sh = New(opts...)

	require.NoError(t, sh.Open())
	require.NoError(t, sh.Init(context.Background()))

	return sh
}

func releaseShard(s *Shard, t testing.TB) {
	require.NoError(t, s.Close())
}