package handler

import (
	"context"
	"fmt"
	"strconv"
	"strings"

	containerContract "git.frostfs.info/TrueCloudLab/frostfs-contract/container"
	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/data"
	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/handler/middleware"
	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/logs"
	v2container "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/api/container"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
	"go.uber.org/zap"
)

const (
	attributeLocationConstraint = ".s3-location-constraint"
	AttributeLockEnabled        = "LockEnabled"
)

func (h *Handler) containerInfo(ctx context.Context, cnrID cid.ID) (*data.BucketInfo, error) {
	var (
		err error
		res *container.Container
		log = h.reqLogger(ctx).With(zap.Stringer("cid", cnrID))

		info = &data.BucketInfo{
			CID:  cnrID,
			Name: cnrID.EncodeToString(),
		}
	)

	res, err = h.cnrContract.GetContainerByID(cnrID)
	if err != nil {
		if strings.Contains(err.Error(), containerContract.NotFoundError) {
			return nil, fmt.Errorf("get container: %s", err.Error())
		}
		return nil, fmt.Errorf("get frostfs container: %w", err)
	}

	cnr := *res

	info.Owner = cnr.Owner()
	if domain := container.ReadDomain(cnr); domain.Name() != "" {
		info.Name = domain.Name()
		info.Zone = domain.Zone()
	}
	info.Created = container.CreatedAt(cnr)
	info.LocationConstraint = cnr.Attribute(attributeLocationConstraint)
	info.HomomorphicHashDisabled = container.IsHomomorphicHashingDisabled(cnr)
	info.PlacementPolicy = cnr.PlacementPolicy()

	attrLockEnabled := cnr.Attribute(AttributeLockEnabled)
	if len(attrLockEnabled) > 0 {
		info.ObjectLockEnabled, err = strconv.ParseBool(attrLockEnabled)
		if err != nil {
			log.Error(logs.CouldNotParseContainerObjectLockEnabledAttribute,
				zap.String("lock_enabled", attrLockEnabled),
				zap.Error(err),
				logs.TagField(logs.TagDatapath),
			)
		}
	}
	ns, err := middleware.GetNamespace(ctx)
	if err != nil {
		return nil, fmt.Errorf("get namespace: %w", err)
	}
	zone := formContainerZone(ns)
	if zone != info.Zone {
		return nil, fmt.Errorf("ns '%s' and zone '%s' are mismatched for container '%s'", zone, info.Zone, cnrID)
	}

	if err = h.cache.Put(info); err != nil {
		h.reqLogger(ctx).Warn(logs.CouldntPutBucketIntoCache,
			zap.String("bucket name", info.Name),
			zap.Stringer("bucket cid", info.CID),
			zap.Error(err),
			logs.TagField(logs.TagDatapath))
	}

	return info, nil
}

func formContainerZone(ns string) string {
	if len(ns) == 0 {
		return v2container.SysAttributeZoneDefault
	}

	return ns + ".ns"
}