// Copyright 2019 Yunion
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package models

import (
	"context"
	"fmt" // "strings"
	"time"

	"yunion.io/x/cloudmux/pkg/apis/compute"
	"yunion.io/x/cloudmux/pkg/cloudprovider"
	"yunion.io/x/jsonutils"
	"yunion.io/x/log"
	"yunion.io/x/pkg/errors"
	"yunion.io/x/pkg/tristate"
	"yunion.io/x/pkg/util/billing"
	"yunion.io/x/sqlchemy"

	billing_api "yunion.io/x/onecloud/pkg/apis/billing"
	api "yunion.io/x/onecloud/pkg/apis/compute"
	"yunion.io/x/onecloud/pkg/cloudcommon/db"
	"yunion.io/x/onecloud/pkg/cloudcommon/db/lockman"
	"yunion.io/x/onecloud/pkg/cloudcommon/db/taskman"
	"yunion.io/x/onecloud/pkg/compute/baremetal"
	"yunion.io/x/onecloud/pkg/httperrors"
	"yunion.io/x/onecloud/pkg/mcclient"
	"yunion.io/x/onecloud/pkg/util/logclient"
)

func (self *SHost) GetResourceType() string {
	if len(self.ResourceType) > 0 {
		return self.ResourceType
	}
	return api.HostResourceTypeDefault
}

func (self *SGuest) CanPerformPrepaidRecycle() error {
	if self.BillingType != billing_api.BILLING_TYPE_PREPAID {
		return fmt.Errorf("recycle prepaid server only")
	}
	if self.ExpiredAt.Before(time.Now()) {
		return fmt.Errorf("prepaid expired")
	}
	host, _ := self.GetHost()
	if host == nil {
		return fmt.Errorf("no host")
	}
	if !host.IsManaged() {
		return fmt.Errorf("only managed prepaid server can be pooled")
	}
	return nil
}

func (self *SGuest) PerformPrepaidRecycle(ctx context.Context, userCred mcclient.TokenCredential, query jsonutils.JSONObject, data jsonutils.JSONObject) (jsonutils.JSONObject, error) {
	if !self.IsInStatus(api.VM_READY, api.VM_RUNNING) {
		return nil, httperrors.NewInvalidStatusError("cannot recycle in status %s", self.Status)
	}
	err := self.CanPerformPrepaidRecycle()
	if err != nil {
		return nil, httperrors.NewInvalidStatusError("%v", err)
	}

	return self.DoPerformPrepaidRecycle(ctx, userCred, jsonutils.QueryBoolean(data, "auto_delete", false))
}

func (self *SGuest) DoPerformPrepaidRecycle(ctx context.Context, userCred mcclient.TokenCredential, autoDelete bool) (jsonutils.JSONObject, error) {
	err := self.doPrepaidRecycle(ctx, userCred)
	if err != nil {
		logclient.AddActionLogWithContext(ctx, self, logclient.ACT_RECYCLE_PREPAID, self.GetShortDesc(ctx), userCred, false)
		return nil, httperrors.NewGeneralError(err)
	}

	db.OpsLog.LogEvent(self, db.ACT_RECYCLE_PREPAID, self.GetShortDesc(ctx), userCred)
	logclient.AddActionLogWithContext(ctx, self, logclient.ACT_RECYCLE_PREPAID, self.GetShortDesc(ctx), userCred, true)

	if autoDelete {
		opts := api.ServerDeleteInput{
			OverridePendingDelete: true,
		}
		self.StartDeleteGuestTask(ctx, userCred, "", opts)
	}

	return nil, nil
}

func (self *SGuest) doPrepaidRecycle(ctx context.Context, userCred mcclient.TokenCredential) error {
	lockman.LockClass(ctx, HostManager, userCred.GetProjectId())
	defer lockman.ReleaseClass(ctx, HostManager, userCred.GetProjectId())

	return self.doPrepaidRecycleNoLock(ctx, userCred)
}

func (self *SGuest) doPrepaidRecycleNoLock(ctx context.Context, userCred mcclient.TokenCredential) error {
	oHost, _ := self.GetHost()

	fakeHost := SHost{}
	fakeHost.SetModelManager(HostManager, &fakeHost)

	fakeHost.Name = fmt.Sprintf("%s-host", self.Name)
	fakeHost.CpuCount = self.VcpuCount
	fakeHost.NodeCount = 1
	fakeHost.CpuCmtbound = 1.0

	fakeHost.MemCmtbound = 1.0
	fakeHost.MemReserved = 0
	fakeHost.MemSize = self.VmemSize

	guestdisks, _ := self.GetGuestDisks()

	storageInfo := make([]baremetal.BaremetalStorage, 0)
	totalSize := int64(0)
	for i := 0; i < len(guestdisks); i += 1 {
		disk := guestdisks[i].GetDisk()
		storage, _ := disk.GetStorage()

		totalSize += int64(disk.DiskSize)

		if len(fakeHost.StorageType) == 0 {
			fakeHost.StorageType = storage.StorageType
		}

		info := baremetal.BaremetalStorage{}
		info.Size = int64(disk.DiskSize)
		info.Index = int64(i)
		info.Slot = i
		info.Driver = baremetal.DISK_DRIVER_LINUX
		info.Rotate = (storage.MediumType != api.DISK_TYPE_SSD)

		storageInfo = append(storageInfo, info)
	}

	fakeHost.StorageDriver = baremetal.DISK_DRIVER_LINUX
	fakeHost.StorageSize = totalSize
	fakeHost.StorageInfo = jsonutils.Marshal(&storageInfo)

	zone, _ := self.getZone()
	fakeHost.ZoneId = zone.GetId()
	fakeHost.IsBaremetal = false
	fakeHost.IsMaintenance = false
	fakeHost.ResourceType = api.HostResourceTypePrepaidRecycle

	guestnics, err := self.GetNetworks("")
	if err != nil || len(guestnics) == 0 {
		msg := fmt.Sprintf("no network info on guest???? %v", err)
		log.Errorf("%s", msg)
		return fmt.Errorf("%s", msg)
	}
	fakeHost.AccessIp = guestnics[0].IpAddr
	fakeHost.AccessMac = guestnics[0].MacAddr

	fakeHost.BillingType = billing_api.BILLING_TYPE_PREPAID
	fakeHost.BillingCycle = self.BillingCycle
	fakeHost.ExpiredAt = self.ExpiredAt

	fakeHost.Status = api.HOST_STATUS_RUNNING
	fakeHost.HostStatus = api.HOST_ONLINE
	fakeHost.SetEnabled(true)
	fakeHost.HostType = oHost.HostType
	fakeHost.ExternalId = oHost.ExternalId
	fakeHost.RealExternalId = self.ExternalId
	fakeHost.ManagerId = oHost.ManagerId
	fakeHost.IsEmulated = true
	fakeHost.Description = "fake host for prepaid vm recycling"

	err = HostManager.TableSpec().Insert(ctx, &fakeHost)
	if err != nil {
		log.Errorf("fail to insert fake host %s", err)
		return err
	}

	for i := 0; i < len(guestnics); i += 1 {
		var nicType compute.TNicType
		if i == 0 {
			nicType = api.NIC_TYPE_ADMIN
		}
		ifname := fmt.Sprintf("eth%d", i)
		brname := fmt.Sprintf("br%d", i)
		net, err := guestnics[i].GetNetwork()
		if err != nil {
			return errors.Wrapf(err, "GetNetwork")
		}
		err = fakeHost.addNetif(ctx, userCred,
			guestnics[i].MacAddr,
			1,
			net.WireId,
			"",
			"",
			1000,
			nicType,
			i,
			tristate.True,
			1500,
			false,
			&ifname,
			&brname,
			false,
			false,
			false,
			false,
		)
		if err != nil {
			log.Errorf("fail to addNetInterface %d: %s", i, err)
			fakeHost.RealDelete(ctx, userCred)
			return err
		}
	}

	storageSize := int64(0)
	var externalId string
	for i := 0; i < len(guestdisks); i += 1 {
		disk := guestdisks[i].GetDisk()
		storage, _ := disk.GetStorage()
		if disk.BillingType == billing_api.BILLING_TYPE_PREPAID {
			storageSize += int64(disk.DiskSize)
			if len(externalId) == 0 {
				externalId = storage.ExternalId
			} else {
				if externalId != storage.ExternalId {
					msg := "inconsistent storage !!!!"
					log.Errorf("%s", msg)
					fakeHost.RealDelete(ctx, userCred)
					return errors.Wrap(httperrors.ErrConflict, msg)
				}
			}
		}
	}

	sysStorage, _ := guestdisks[0].GetDisk().GetStorage()

	fakeStorage := SStorage{}
	fakeStorage.SetModelManager(StorageManager, &fakeStorage)

	fakeStorage.Name = fmt.Sprintf("%s-storage", self.Name)
	fakeStorage.Capacity = storageSize
	fakeStorage.StorageType = api.STORAGE_LOCAL
	fakeStorage.MediumType = sysStorage.MediumType
	fakeStorage.Cmtbound = 1.0
	fakeStorage.ZoneId = fakeHost.ZoneId
	fakeStorage.StoragecacheId = sysStorage.StoragecacheId
	fakeStorage.Enabled = tristate.True
	fakeStorage.Status = api.STORAGE_ONLINE
	fakeStorage.Description = "fake storage for prepaid vm recycling"
	fakeStorage.IsEmulated = true
	fakeStorage.ManagerId = sysStorage.ManagerId
	fakeStorage.ExternalId = externalId

	err = StorageManager.TableSpec().Insert(ctx, &fakeStorage)
	if err != nil {
		log.Errorf("fail to insert fake storage %s", err)
		fakeHost.RealDelete(ctx, userCred)
		return err
	}

	err = fakeHost.Attach2Storage(ctx, userCred, &fakeStorage, "")
	if err != nil {
		log.Errorf("fail to add fake storage: %s", err)
		fakeHost.RealDelete(ctx, userCred)
		return err
	}

	_, err = db.Update(self, func() error {
		// clear billing information
		self.BillingType = billing_api.BILLING_TYPE_POSTPAID
		self.BillingCycle = ""
		self.ExpiredAt = time.Time{}
		// switch to fakeHost
		self.HostId = fakeHost.Id
		return nil
	})
	if err != nil {
		log.Errorf("clear billing information fail: %s", err)
		fakeHost.RealDelete(ctx, userCred)
		return err
	}

	for i := 0; i < len(guestdisks); i += 1 {
		disk := guestdisks[i].GetDisk()

		if disk.BillingType == billing_api.BILLING_TYPE_PREPAID {
			_, err = db.Update(disk, func() error {
				disk.BillingType = billing_api.BILLING_TYPE_POSTPAID
				disk.BillingCycle = ""
				disk.ExpiredAt = time.Time{}
				disk.StorageId = fakeStorage.Id
				return nil
			})
			if err != nil {
				log.Errorf("clear billing information for %d %s disk fail: %s", i, disk.DiskType, err)
				fakeHost.RealDelete(ctx, userCred)
				return err
			}
		}
	}

	return nil
}

func (self *SGuest) PerformUndoPrepaidRecycle(ctx context.Context, userCred mcclient.TokenCredential, query jsonutils.JSONObject, data jsonutils.JSONObject) (jsonutils.JSONObject, error) {
	if !self.IsInStatus(api.VM_READY, api.VM_RUNNING) {
		return nil, httperrors.NewInvalidStatusError("cannot undo recycle in status %s", self.Status)
	}

	host, _ := self.GetHost()

	if host == nil {
		return nil, httperrors.NewInvalidStatusError("no valid host")
	}

	if host.GetEnabled() {
		return nil, httperrors.NewInvalidStatusError("host should be disabled")
	}

	if host.ResourceType != api.HostResourceTypePrepaidRecycle || host.BillingType != billing_api.BILLING_TYPE_PREPAID {
		return nil, httperrors.NewInvalidStatusError("host is not a prepaid recycle host")
	}

	err := doUndoPrepaidRecycleLockHost(ctx, userCred, host, self)
	if err != nil {
		logclient.AddActionLogWithContext(ctx, self, logclient.ACT_UNDO_RECYCLE_PREPAID, self.GetShortDesc(ctx), userCred, false)
		return nil, httperrors.NewGeneralError(err)
	}

	db.OpsLog.LogEvent(self, db.ACT_UNDO_RECYCLE_PREPAID, self.GetShortDesc(ctx), userCred)
	logclient.AddActionLogWithContext(ctx, self, logclient.ACT_UNDO_RECYCLE_PREPAID, self.GetShortDesc(ctx), userCred, true)

	return nil, nil
}

func (self *SHost) PerformUndoPrepaidRecycle(ctx context.Context, userCred mcclient.TokenCredential, query jsonutils.JSONObject, data jsonutils.JSONObject) (jsonutils.JSONObject, error) {
	if self.GetEnabled() {
		return nil, httperrors.NewInvalidStatusError("host should be disabled")
	}

	if self.ResourceType != api.HostResourceTypePrepaidRecycle || self.BillingType != billing_api.BILLING_TYPE_PREPAID {
		return nil, httperrors.NewInvalidStatusError("host is not a prepaid recycle host")
	}

	guests, err := self.GetGuests()
	if err != nil {
		return nil, httperrors.NewGeneralError(errors.Wrapf(err, "GetGuests"))
	}

	if len(guests) == 0 {
		return nil, httperrors.NewInvalidStatusError("cannot delete a recycle host without active instance")
	}

	if len(guests) > 1 {
		return nil, httperrors.NewInvalidStatusError("a recycle host shoud not allocate more than 1 guest")
	}

	if !guests[0].IsInStatus(api.VM_READY, api.VM_RUNNING) {
		return nil, httperrors.NewInvalidStatusError("cannot undo recycle in status %s", guests[0].Status)
	}

	if guests[0].PendingDeleted {
		return nil, httperrors.NewInvalidStatusError("cannot undo a recycle host with pending_deleted guest")
	}

	err = doUndoPrepaidRecycleLockGuest(ctx, userCred, self, &guests[0])
	if err != nil {
		logclient.AddActionLogWithContext(ctx, self, logclient.ACT_UNDO_RECYCLE_PREPAID, self.GetShortDesc(ctx), userCred, false)
		return nil, httperrors.NewGeneralError(err)
	}

	db.OpsLog.LogEvent(self, db.ACT_UNDO_RECYCLE_PREPAID, self.GetShortDesc(ctx), userCred)
	logclient.AddActionLogWithContext(ctx, self, logclient.ACT_UNDO_RECYCLE_PREPAID, self.GetShortDesc(ctx), userCred, true)

	return nil, nil
}

func findIdiskById(idisks []cloudprovider.ICloudDisk, uuid string) cloudprovider.ICloudDisk {
	for i := 0; i < len(idisks); i += 1 {
		if idisks[i].GetGlobalId() == uuid {
			return idisks[i]
		}
	}
	return nil
}

func doUndoPrepaidRecycleLockGuest(ctx context.Context, userCred mcclient.TokenCredential, host *SHost, server *SGuest) error {
	lockman.LockObject(ctx, server)
	defer lockman.ReleaseObject(ctx, server)

	return doUndoPrepaidRecycleNoLock(ctx, userCred, host, server)
}

func doUndoPrepaidRecycleLockHost(ctx context.Context, userCred mcclient.TokenCredential, host *SHost, server *SGuest) error {
	lockman.LockObject(ctx, host)
	defer lockman.ReleaseObject(ctx, host)

	return doUndoPrepaidRecycleNoLock(ctx, userCred, host, server)
}

func doUndoPrepaidRecycleNoLock(ctx context.Context, userCred mcclient.TokenCredential, host *SHost, server *SGuest) error {
	if host.RealExternalId != server.ExternalId {
		msg := "host and server external id not match!!!!"
		log.Errorf("%v", msg)
		return errors.Wrap(httperrors.ErrConflict, msg)
	}

	q := HostManager.Query()
	q = q.Equals("external_id", host.ExternalId)
	q = q.Equals("host_type", host.HostType)
	q = q.Filter(sqlchemy.OR(
		sqlchemy.IsNullOrEmpty(q.Field("resource_type")),
		sqlchemy.Equals(q.Field("resource_type"), api.HostResourceTypeShared),
	))

	oHostCnt, err := q.CountWithError()

	if err != nil {
		return err
	}

	if oHostCnt == 0 {
		msg := "orthordox host not found???"
		log.Errorf("%s", msg)
		return errors.Wrap(httperrors.ErrConflict, msg)
	}
	if oHostCnt > 1 {
		msg := fmt.Sprintf("more than 1 (%d) orthordox host found???", oHostCnt)
		log.Errorf("%s", msg)
		return errors.Wrap(httperrors.ErrConflict, msg)
	}

	oHost := SHost{}
	oHost.SetModelManager(HostManager, &oHost)

	err = q.First(&oHost)
	if err != nil {
		msg := fmt.Sprintf("fail to query orthordox host %v", err)
		log.Errorf("%s", msg)
		return errors.Wrap(err, msg)
	}

	guestdisks, _ := server.GetGuestDisks()

	// check disk data integrity
	for i := 0; i < len(guestdisks); i += 1 {
		disk := guestdisks[i].GetDisk()
		storage, _ := disk.GetStorage()
		if storage.StorageType == api.STORAGE_LOCAL {
			oHostStorage := oHost.GetHoststorageByExternalId(storage.ExternalId)
			if oHostStorage == nil {
				msg := fmt.Sprintf("oHost.GetHoststorageByExternalId not found %s", storage.ExternalId)
				log.Errorf("%s", msg)
				return errors.Wrap(httperrors.ErrConflict, msg)
			}
		}
	}

	// check passed, do convert
	_, err = db.Update(server, func() error {
		// recover billing information
		server.BillingType = billing_api.BILLING_TYPE_PREPAID
		server.BillingCycle = host.BillingCycle
		server.ExpiredAt = host.ExpiredAt
		// switch to original Host
		server.HostId = oHost.Id
		return nil
	})
	if err != nil {
		log.Errorf("fail to recover vm hostId %s", err)
		return errors.Wrap(err, "Update")
	}

	for i := 0; i < len(guestdisks); i += 1 {
		disk := guestdisks[i].GetDisk()
		storage, _ := disk.GetStorage()

		if storage.StorageType == api.STORAGE_LOCAL {
			oHostStorage := oHost.GetHoststorageByExternalId(storage.ExternalId)
			if oHostStorage == nil {
				msg := fmt.Sprintf("oHost.GetHoststorageByExternalId not found %s", storage.ExternalId)
				log.Errorf("%s", msg)
				return errors.Wrap(httperrors.ErrConflict, msg)
			}
			oStorage := oHostStorage.GetStorage()
			_, err = db.Update(disk, func() error {
				disk.BillingType = billing_api.BILLING_TYPE_PREPAID
				disk.BillingCycle = host.BillingCycle
				disk.ExpiredAt = host.ExpiredAt
				disk.StorageId = oStorage.Id
				disk.AutoDelete = true
				return nil
			})
			if err != nil {
				log.Errorf("fail to recover prepaid disk info %s", err)
				return err
			}
		}
	}

	err = host.RealDelete(ctx, userCred)
	if err != nil {
		log.Errorf("fail to delete fake host")
		logclient.AddActionLogWithContext(ctx, server, logclient.ACT_UNDO_RECYCLE_PREPAID, err, userCred, false)
		return err
	}

	return nil
}

func (self *SGuest) IsPrepaidRecycle() bool {
	host, _ := self.GetHost()
	if host == nil {
		return false
	}
	return host.IsPrepaidRecycle()
}

func (host *SHost) IsPrepaidRecycle() bool {
	if host.ResourceType != api.HostResourceTypePrepaidRecycle {
		return false
	}
	if host.BillingType != billing_api.BILLING_TYPE_PREPAID {
		return false
	}
	return true
}

func (self *SHost) BorrowIpAddrsFromGuest(ctx context.Context, userCred mcclient.TokenCredential, guest *SGuest) error {
	guestnics, err := guest.GetNetworks("")
	if err != nil {
		return err
	}
	for i := 0; i < len(guestnics); i += 1 {
		err := guestnics[i].Detach(ctx, userCred)
		if err != nil {
			log.Errorf("fail to detach guest network %s", err)
			return err
		}

		netif := self.GetNetInterface(guestnics[i].MacAddr, 1)
		if netif == nil {
			msg := fmt.Sprintf("fail to find netinterface for mac %s", guestnics[i].MacAddr)
			log.Errorf("%s", msg)
			return fmt.Errorf("%s", msg)
		}

		err = self.EnableNetif(ctx, userCred, netif, "", guestnics[i].IpAddr, guestnics[i].Ip6Addr, "", "", false, false, false, false)
		if err != nil {
			log.Errorf("fail to enable netif %s %s", guestnics[i].IpAddr, err)
			return err
		}
	}
	return nil
}

func (host *SHost) SetGuestCreateNetworkAndDiskParams(ctx context.Context, userCred mcclient.TokenCredential, input *api.ServerCreateInput) (*api.ServerCreateInput, error) {
	ihost, err := host.GetIHost(ctx)
	if err != nil {
		return nil, errors.Wrapf(err, "GetIHost")
	}

	ivm, err := ihost.GetIVMById(host.RealExternalId)
	if err != nil {
		return nil, errors.Wrapf(err, "GetIVMById(%s)", host.RealExternalId)
	}

	idisks, err := ivm.GetIDisks()
	if err != nil {
		return nil, errors.Wrapf(err, "ivm.GetIDisks")
	}

	netifs := host.GetHostNetInterfaces()
	netIdx := 0
	input.Networks = make([]*api.NetworkConfig, 0)
	for i := 0; i < len(netifs); i += 1 {
		hn := netifs[i].GetHostNetwork()
		if hn != nil {
			err := host.DisableNetif(ctx, userCred, &netifs[i], true)
			if err != nil {
				return nil, err
			}
			// packedMac := strings.Replace(netifs[i].Mac, ":", "", -1)
			input.Networks = append(input.Networks, &api.NetworkConfig{
				Network:  hn.NetworkId,
				Mac:      netifs[i].Mac,
				Address:  hn.IpAddr,
				Address6: hn.Ip6Addr,
				Reserved: true,
			})
			netIdx += 1
		}
	}
	//params.Set(fmt.Sprintf("net.%d", netIdx), jsonutils.JSONNull)

	for i := 0; i < len(idisks); i += 1 {
		/*istorage, err := idisks[i].GetIStorage()
		if err != nil {
			log.Errorf("idisks[i].GetIStorage fail %s", err)
			return nil, err
		}*/

		var diskConfig *api.DiskConfig
		if i < len(input.Disks) {
			diskConfig = input.Disks[i]
			diskConfig, err := parseDiskInfo(ctx, userCred, diskConfig)
			if err != nil {
				log.Debugf("parseDiskInfo %#v fail %s", diskConfig, err)
				return nil, err
			}
			diskConfig.SizeMb = idisks[i].GetDiskSizeMB()
			diskConfig.Backend = api.STORAGE_LOCAL
			input.Disks[i] = diskConfig
		} else {
			conf := &api.DiskConfig{
				SizeMb:  idisks[i].GetDiskSizeMB(),
				Backend: api.STORAGE_LOCAL,
			}
			conf, err = parseDiskInfo(ctx, userCred, conf)
			if err != nil {
				return nil, err
			}
			input.Disks = append(input.Disks, conf)
		}
	}
	//params.Set(fmt.Sprintf("disk.%d", len(idisks)), jsonutils.JSONNull)

	// log.Debugf("params after rebuid: %s", params.String())

	return input, nil
}

func (host *SHost) RebuildRecycledGuest(ctx context.Context, userCred mcclient.TokenCredential, guest *SGuest) error {
	oHost := SHost{}
	oHost.SetModelManager(HostManager, &oHost)

	q := HostManager.Query()
	q = q.Equals("external_id", host.ExternalId)
	q = q.Filter(sqlchemy.OR(
		sqlchemy.IsNullOrEmpty(q.Field("resource_type")),
		sqlchemy.Equals(q.Field("resource_type"), api.HostResourceTypeShared),
	))

	err := q.First(&oHost)
	if err != nil {
		log.Errorf("query oHost fail %s", err)
		return err
	}

	err = db.SetExternalId(guest, userCred, host.RealExternalId)
	if err != nil {
		log.Errorf("guest.SetExternalId fail %s", err)
		return err
	}

	extVM, err := guest.GetIVM(ctx)
	if err != nil {
		log.Errorf("guest.GetIVM fail %s", err)
		return err
	}

	iprovider, err := oHost.GetDriver(ctx)
	if err != nil {
		log.Errorf("oHost.GetDriver fail %s", err)
		return err
	}

	err = guest.syncWithCloudVM(ctx, userCred, iprovider, &oHost, extVM, nil, true)
	if err != nil {
		log.Errorf("guest.syncWithCloudVM fail %s", err)
		return err
	}

	idisks, err := extVM.GetIDisks()
	if err != nil {
		log.Errorf("extVM.GetIDisks fail %s", err)
		return err
	}

	guestdisks, _ := guest.GetGuestDisks()
	for i := 0; i < len(guestdisks); i += 1 {
		disk := guestdisks[i].GetDisk()
		err = db.SetExternalId(disk, userCred, idisks[i].GetGlobalId())
		if err != nil {
			log.Errorf("disk.SetExternalId fail %s", err)
			return err
		}
		err = disk.syncWithCloudDisk(ctx, userCred, iprovider, idisks[i], i, guest.GetOwnerId(), host.ManagerId)
		if err != nil {
			log.Errorf("disk.syncWithCloudDisk fail %s", err)
			return err
		}
	}

	return nil
}

func (manager *SHostManager) GetHostByRealExternalId(eid string) *SHost {
	q := manager.Query()
	q = q.Equals("real_external_id", eid)

	host := SHost{}
	host.SetModelManager(manager, &host)

	err := q.First(&host)

	if err != nil {
		return nil
	}

	return &host
}

func (self *SHost) PerformRenewPrepaidRecycle(ctx context.Context, userCred mcclient.TokenCredential, query jsonutils.JSONObject, data jsonutils.JSONObject) (jsonutils.JSONObject, error) {
	if !self.IsPrepaidRecycle() {
		return nil, httperrors.NewInputParameterError("Not a prepaid recycle host")
	}
	if len(self.RealExternalId) == 0 {
		return nil, httperrors.NewGeneralError(fmt.Errorf("host RealExternalId is empty"))
	}
	if len(self.ExternalId) == 0 {
		return nil, httperrors.NewGeneralError(fmt.Errorf("host ExternalId is empty"))
	}
	durationStr := jsonutils.GetAnyString(data, []string{"duration"})
	if len(durationStr) == 0 {
		return nil, httperrors.NewMissingParameterError("duration")
	}

	bc, err := billing.ParseBillingCycle(durationStr)
	if err != nil {
		return nil, httperrors.NewInputParameterError("invalid duration %s: %s", durationStr, err)
	}

	hostDriver, err := self.GetHostDriver()
	if err != nil {
		return nil, errors.Wrapf(err, "GetHostDriver")
	}

	driver, err := GetDriver(hostDriver.GetHypervisor(), hostDriver.GetProvider())
	if err != nil {
		return nil, err
	}

	if !driver.IsSupportedBillingCycle(bc) {
		return nil, httperrors.NewInputParameterError("unsupported duration %s", durationStr)
	}

	err = self.startPrepaidRecycleHostRenewTask(ctx, userCred, durationStr, "")
	if err != nil {
		return nil, err
	}

	return nil, nil
}

func (self *SHost) startPrepaidRecycleHostRenewTask(ctx context.Context, userCred mcclient.TokenCredential, duration string, parentTaskId string) error {
	data := jsonutils.NewDict()
	data.Add(jsonutils.NewString(duration), "duration")
	task, err := taskman.TaskManager.NewTask(ctx, "PrepaidRecycleHostRenewTask", self, userCred, data, parentTaskId, "", nil)
	if err != nil {
		log.Errorf("fail to crate GuestRenewTask %s", err)
		return err
	}
	task.ScheduleRun(nil)
	return nil
}

func (self *SHost) DoSaveRenewInfo(ctx context.Context, userCred mcclient.TokenCredential, bc *billing.SBillingCycle, expireAt *time.Time) error {
	_, err := db.Update(self, func() error {
		if self.BillingType != billing_api.BILLING_TYPE_PREPAID {
			self.BillingType = billing_api.BILLING_TYPE_PREPAID
		}
		if expireAt != nil && !expireAt.IsZero() {
			self.ExpiredAt = *expireAt
		} else {
			self.BillingCycle = bc.String()
			self.ExpiredAt = bc.EndAt(self.ExpiredAt)
		}
		return nil
	})
	if err != nil {
		log.Errorf("Update error %s", err)
		return err
	}
	db.OpsLog.LogEvent(self, db.ACT_RENEW, self.GetShortDesc(ctx), userCred)
	return nil
}

func (self *SHost) SyncWithRealPrepaidVM(ctx context.Context, userCred mcclient.TokenCredential, iVM cloudprovider.ICloudVM) error {
	lockman.LockObject(ctx, self)
	defer lockman.ReleaseObject(ctx, self)

	exp := iVM.GetExpiredAt()
	if self.ExpiredAt != exp {
		return self.DoSaveRenewInfo(ctx, userCred, nil, &exp)
	}
	return nil
}