package engine

import (
	"context"
	"errors"

	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard"
	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
)

func (e *StorageEngine) exists(ctx context.Context, addr oid.Address) (bool, error) {
	var shPrm shard.ExistsPrm
	shPrm.SetAddress(addr)
	alreadyRemoved := false
	exists := false

	e.iterateOverSortedShards(addr, func(_ int, sh hashedShard) (stop bool) {
		res, err := sh.Exists(ctx, shPrm)
		if err != nil {
			if shard.IsErrRemoved(err) {
				alreadyRemoved = true

				return true
			}

			var siErr *objectSDK.SplitInfoError
			if errors.As(err, &siErr) {
				return true
			}

			if shard.IsErrObjectExpired(err) {
				return true
			}

			if !shard.IsErrNotFound(err) {
				e.reportShardError(sh, "could not check existence of object in shard", err)
			}
			return false
		}

		if !exists {
			exists = res.Exists()
		}

		return false
	})

	if alreadyRemoved {
		var errRemoved apistatus.ObjectAlreadyRemoved

		return false, errRemoved
	}

	return exists, nil
}