package infrastructure

import (
	"encoding/json"
	"errors"
	"fmt"
	"strings"
	"time"

	oclib "cloud.o-forge.io/core/oc-lib"
	"cloud.o-forge.io/core/oc-lib/models/bill"
	"cloud.o-forge.io/core/oc-lib/models/booking"
	"cloud.o-forge.io/core/oc-lib/models/booking/planner"
	"cloud.o-forge.io/core/oc-lib/models/common/enum"
	"cloud.o-forge.io/core/oc-lib/models/common/pricing"
	"cloud.o-forge.io/core/oc-lib/models/order"
	"cloud.o-forge.io/core/oc-lib/models/peer"
	"cloud.o-forge.io/core/oc-lib/models/resources"
	"cloud.o-forge.io/core/oc-lib/models/resources/purchase_resource"
	"cloud.o-forge.io/core/oc-lib/models/utils"
	"cloud.o-forge.io/core/oc-lib/models/workflow"
	"cloud.o-forge.io/core/oc-lib/models/workflow_execution"
	"cloud.o-forge.io/core/oc-lib/tools"
	"github.com/google/uuid"
	"github.com/robfig/cron"
)

/*
* WorkflowSchedule is a struct that contains the scheduling information of a workflow
* It contains the mode of the schedule (Task or Service), the name of the schedule, the start and end time of the schedule and the cron expression
 */
// it's a flying object only use in a session time. It's not stored in the database
type WorkflowSchedule struct {
	UUID              string                                  `json:"id" validate:"required"`                // ExecutionsID is the list of the executions id of the workflow
	Workflow          *workflow.Workflow                      `json:"workflow,omitempty"`                    // Workflow is the workflow dependancy of the schedule
	WorkflowExecution []*workflow_execution.WorkflowExecution `json:"workflow_executions,omitempty"`         // WorkflowExecution is the list of executions of the workflow
	Message           string                                  `json:"message,omitempty"`                     // Message is the message of the schedule
	Warning           string                                  `json:"warning,omitempty"`                     // Warning is the warning message of the schedule
	Start             time.Time                               `json:"start" validate:"required,ltfield=End"` // Start is the start time of the schedule, is required and must be less than the End time
	End               *time.Time                              `json:"end,omitempty"`                         // End is the end time of the schedule, is required and must be greater than the Start time
	DurationS         float64                                 `json:"duration_s" default:"-1"`               // End is the end time of the schedule
	Cron              string                                  `json:"cron,omitempty"`                        // here the cron format : ss mm hh dd MM dw task

	BookingMode          booking.BookingMode `json:"booking_mode,omitempty"` // BookingMode qualify the preemption order of the scheduling. if no payment allowed with preemption set up When_Possible
	SelectedInstances    workflow.ConfigItem `json:"selected_instances"`
	SelectedPartnerships workflow.ConfigItem `json:"selected_partnerships"`
	SelectedBuyings      workflow.ConfigItem `json:"selected_buyings"`
	SelectedStrategies   workflow.ConfigItem `json:"selected_strategies"`

	SelectedBillingStrategy pricing.BillingStrategy `json:"selected_billing_strategy"`
}

// TODO PREEMPTION !
/*
To schedule a preempted, omg.
pour faire ça on doit alors lancé une exécution prioritaire qui passera devant toutes les autres, celon un niveau de priorité.
Preemptible = 7, pour le moment il n'existera que 0 et 7.
Dans le cas d'une préemption l'exécution est immédiable et bloquera tout le monde tant qu'il n'a pas été exécuté.
Une ressource doit pouvoir être preemptible pour être exécutée de la sorte.
Se qui implique si on est sur une ressource par ressource que si un élement n'est pas préemptible,
alors il devra être effectué dés que possible

Dans le cas dés que possible, la start date est immédiate MAIS !
ne pourra se lancé que SI il n'existe pas d'exécution se lançant durant la période indicative. ( Ultra complexe )
*/

func NewScheduler(mode int, start string, end string, durationInS float64, cron string) *WorkflowSchedule {
	ws := &WorkflowSchedule{
		UUID:        uuid.New().String(),
		Start:       time.Now(),
		BookingMode: booking.BookingMode(mode),
		DurationS:   durationInS,
		Cron:        cron,
	}
	s, err := time.Parse("2006-01-02T15:04:05", start)
	if err == nil && ws.BookingMode == booking.PLANNED {
		ws.Start = s // can apply a defined start other than now, if planned
	}

	e, err := time.Parse("2006-01-02T15:04:05", end)
	if err == nil {
		ws.End = &e
	}
	return ws
}

func (ws *WorkflowSchedule) GetBuyAndBook(wfID string, request *tools.APIRequest) (bool, *workflow.Workflow, []*workflow_execution.WorkflowExecution, []*purchase_resource.PurchaseResource, []*booking.Booking, error) {
	if request.Caller == nil && request.Caller.URLS == nil && request.Caller.URLS[tools.BOOKING] == nil || request.Caller.URLS[tools.BOOKING][tools.GET] == "" {
		return false, nil, []*workflow_execution.WorkflowExecution{}, []*purchase_resource.PurchaseResource{}, []*booking.Booking{}, errors.New("no caller defined")
	}
	access := workflow.NewAccessor(request)
	res, code, err := access.LoadOne(wfID)
	if code != 200 {
		return false, nil, []*workflow_execution.WorkflowExecution{}, []*purchase_resource.PurchaseResource{}, []*booking.Booking{}, errors.New("could not load the workflow with id: " + err.Error())
	}
	wf := res.(*workflow.Workflow)
	isPreemptible, longest, priceds, wf, err := wf.Planify(ws.Start, ws.End,
		ws.SelectedInstances, ws.SelectedPartnerships, ws.SelectedBuyings, ws.SelectedStrategies,
		int(ws.BookingMode), request)
	if err != nil {
		return false, wf, []*workflow_execution.WorkflowExecution{}, []*purchase_resource.PurchaseResource{}, []*booking.Booking{}, err
	}
	ws.DurationS = longest
	ws.Message = "We estimate that the workflow will start at " + ws.Start.String() + " and last " + fmt.Sprintf("%v", ws.DurationS) + " seconds."
	if ws.End != nil && ws.Start.Add(time.Duration(longest)*time.Second).After(*ws.End) {
		ws.Warning = "The workflow may be too long to be executed in the given time frame, we will try to book it anyway\n"
	}
	execs, err := ws.GetExecutions(wf, isPreemptible)
	if err != nil {
		return false, wf, []*workflow_execution.WorkflowExecution{}, []*purchase_resource.PurchaseResource{}, []*booking.Booking{}, err
	}
	purchased := []*purchase_resource.PurchaseResource{}
	bookings := []*booking.Booking{}
	for _, exec := range execs {
		purchased = append(purchased, exec.Buy(ws.SelectedBillingStrategy, ws.UUID, wfID, priceds)...)
		bookings = append(bookings, exec.Book(ws.UUID, wfID, priceds)...)
	}
	return true, wf, execs, purchased, bookings, nil
}

func (ws *WorkflowSchedule) GenerateOrder(purchases []*purchase_resource.PurchaseResource, bookings []*booking.Booking, request *tools.APIRequest) error {
	newOrder := &order.Order{
		AbstractObject: utils.AbstractObject{
			Name:    "order_" + request.PeerID + "_" + time.Now().UTC().Format("2006-01-02T15:04:05"),
			IsDraft: true,
		},
		ExecutionsID: ws.UUID,
		Purchases:    purchases,
		Bookings:     bookings,
		Status:       enum.PENDING,
	}
	if res, _, err := order.NewAccessor(request).StoreOne(newOrder); err == nil {
		if _, err := bill.DraftFirstBill(res.(*order.Order), request); err != nil {
			return err
		}
		return nil
	} else {
		return err
	}
}

func (ws *WorkflowSchedule) Schedules(wfID string, request *tools.APIRequest) (*WorkflowSchedule, *workflow.Workflow, []*workflow_execution.WorkflowExecution, error) {
	if request == nil {
		return ws, nil, []*workflow_execution.WorkflowExecution{}, errors.New("no request found")
	}
	c := request.Caller
	if c == nil || c.URLS == nil || c.URLS[tools.BOOKING] == nil {
		return ws, nil, []*workflow_execution.WorkflowExecution{}, errors.New("no caller defined")
	}
	methods := c.URLS[tools.BOOKING]
	if _, ok := methods[tools.GET]; !ok {
		return ws, nil, []*workflow_execution.WorkflowExecution{}, errors.New("no path found")
	}
	ok, wf, executions, purchases, bookings, err := ws.GetBuyAndBook(wfID, request)
	ws.WorkflowExecution = executions
	if !ok || err != nil {
		return ws, nil, executions, errors.New("could not book the workflow : " + fmt.Sprintf("%v", err))
	}
	ws.Workflow = wf

	// Resolve our own peer MongoDB-ID once; used to decide local vs NATS routing.
	selfID, _ := oclib.GetMySelf()

	errCh := make(chan error, len(purchases))
	for _, purchase := range purchases {
		purchase.IsDraft = true
		go propagateResource(purchase, purchase.DestPeerID, tools.PURCHASE_RESOURCE, selfID, request, errCh)
	}
	for i := 0; i < len(purchases); i++ {
		if err := <-errCh; err != nil {
			return ws, wf, executions, errors.New("could not propagate purchase: " + fmt.Sprintf("%v", err))
		}
	}

	errCh = make(chan error, len(bookings))
	for _, bk := range bookings {
		bk.IsDraft = true
		go propagateResource(bk, bk.DestPeerID, tools.BOOKING, selfID, request, errCh)
	}
	for i := 0; i < len(bookings); i++ {
		if err := <-errCh; err != nil {
			return ws, wf, executions, errors.New("could not propagate booking: " + fmt.Sprintf("%v", err))
		}
	}

	if err := ws.GenerateOrder(purchases, bookings, request); err != nil {
		return ws, wf, executions, err
	}

	fmt.Println("Schedules")
	for _, exec := range executions {
		err := exec.PurgeDraft(request)
		if err != nil {
			return ws, nil, []*workflow_execution.WorkflowExecution{}, errors.New("purge draft" + fmt.Sprintf("%v", err))
		}
		exec.StoreDraftDefault()
		utils.GenericStoreOne(exec, workflow_execution.NewAccessor(request))
		go EmitConsidersExecution(exec, wf)
	}
	fmt.Println("Schedules")

	wf.GetAccessor(&tools.APIRequest{Admin: true}).UpdateOne(wf, wf.GetID())

	return ws, wf, executions, nil
}

// propagateResource routes a purchase or booking to its destination:
//   - If destPeerID matches our own peer (selfMongoID), the object is stored
//     directly in the local DB as draft and the local planner is refreshed.
//   - Otherwise a NATS CREATE_RESOURCE message is emitted so the destination
//     peer can process it asynchronously.
//
// The caller is responsible for setting obj.IsDraft = true before calling.
func propagateResource(obj utils.DBObject, destPeerID string, dt tools.DataType, selfMongoID *peer.Peer, request *tools.APIRequest, errCh chan error) {
	if selfMongoID == nil {
		return
	} // booking or purchase
	if destPeerID == selfMongoID.GetID() {
		if _, _, err := obj.GetAccessor(request).StoreOne(obj); err != nil {
			errCh <- fmt.Errorf("could not store %s locally: %w", dt.String(), err)
			return
		}
		// The planner tracks booking time-slots only; purchases do not affect it.
		if dt == tools.BOOKING {
			go refreshSelfPlanner(selfMongoID.PeerID, request)
		}
		errCh <- nil
		return
	}
	payload, err := json.Marshal(obj)
	if err != nil {
		errCh <- fmt.Errorf("could not serialize %s: %w", dt.String(), err)
		return
	}
	tools.NewNATSCaller().SetNATSPub(tools.CREATE_RESOURCE, tools.NATSResponse{
		FromApp:  "oc-scheduler",
		Datatype: dt,
		Method:   int(tools.CREATE_RESOURCE),
		Payload:  payload,
	})
	errCh <- nil
}

/*
BOOKING IMPLIED TIME, not of subscription but of execution
so is processing time execution time applied on computes
data can improve the processing time
time should implied a security time border (10sec) if not from the same executions
VERIFY THAT WE HANDLE DIFFERENCE BETWEEN LOCATION TIME && BOOKING
*/

/*
* getExecutions is a function that returns the executions of a workflow
* it returns an array of workflow_execution.WorkflowExecution
 */
func (ws *WorkflowSchedule) GetExecutions(workflow *workflow.Workflow, isPreemptible bool) ([]*workflow_execution.WorkflowExecution, error) {
	workflows_executions := []*workflow_execution.WorkflowExecution{}
	dates, err := ws.GetDates()
	if err != nil {
		return workflows_executions, err
	}
	for _, date := range dates {
		obj := &workflow_execution.WorkflowExecution{
			AbstractObject: utils.AbstractObject{
				UUID: uuid.New().String(),                                 // set the uuid of the execution
				Name: workflow.Name + "_execution_" + date.Start.String(), // set the name of the execution
			},
			Priority:     1,
			ExecutionsID: ws.UUID,
			ExecDate:     date.Start,       // set the execution date
			EndDate:      date.End,         // set the end date
			State:        enum.DRAFT,       // set the state to 1 (scheduled)
			WorkflowID:   workflow.GetID(), // set the workflow id dependancy of the execution
		}
		if ws.BookingMode != booking.PLANNED {
			obj.Priority = 0
		}
		if ws.BookingMode == booking.PREEMPTED && isPreemptible {
			obj.Priority = 7
		}

		ws.SelectedStrategies = obj.SelectedStrategies
		ws.SelectedPartnerships = obj.SelectedPartnerships
		ws.SelectedBuyings = obj.SelectedBuyings
		ws.SelectedInstances = obj.SelectedInstances

		workflows_executions = append(workflows_executions, obj)
	}
	return workflows_executions, nil
}

func (ws *WorkflowSchedule) GetDates() ([]Schedule, error) {
	schedule := []Schedule{}
	if len(ws.Cron) > 0 { // if cron is set then end date should be set
		if ws.End == nil {
			return schedule, errors.New("a cron task should have an end date")
		}
		if ws.DurationS <= 0 {
			ws.DurationS = ws.End.Sub(ws.Start).Seconds()
		}
		cronStr := strings.Split(ws.Cron, " ") // split the cron string to treat it
		if len(cronStr) < 6 {                  // if the cron string is less than 6 fields, return an error because format is : ss mm hh dd MM dw (6 fields)
			return schedule, errors.New("Bad cron message: (" + ws.Cron + "). Should be at least ss mm hh dd MM dw")
		}
		subCron := strings.Join(cronStr[:6], " ")
		// cron should be parsed as ss mm hh dd MM dw t (min 6 fields)
		specParser := cron.NewParser(cron.Second | cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow) // create a new cron parser
		sched, err := specParser.Parse(subCron)                                                                // parse the cron string
		if err != nil {
			return schedule, errors.New("Bad cron message: " + err.Error())
		}
		// loop through the cron schedule to set the executions
		for s := sched.Next(ws.Start); !s.IsZero() && s.Before(*ws.End); s = sched.Next(s) {
			e := s.Add(time.Duration(ws.DurationS) * time.Second)
			schedule = append(schedule, Schedule{
				Start: s,
				End:   &e,
			})
		}
	} else { // if no cron, set the execution to the start date
		schedule = append(schedule, Schedule{
			Start: ws.Start,
			End:   ws.End,
		})
	}
	return schedule, nil
}

type Schedule struct {
	Start time.Time
	End   *time.Time
}

/*
* TODO : LARGEST GRAIN PLANIFYING THE WORKFLOW WHEN OPTION IS SET
* SET PROTECTION BORDER TIME
 */

// ---------------------------------------------------------------------------
// Slot availability check
// ---------------------------------------------------------------------------

const (
	checkWindowHours = 5  // how far ahead to scan for a free slot (hours)
	checkStepMin     = 15 // time increment per scan step (minutes)
)

// CheckResult holds the outcome of a slot availability check.
type CheckResult struct {
	Available bool       `json:"available"`
	Start     time.Time  `json:"start"`
	End       *time.Time `json:"end,omitempty"`
	// NextSlot is the nearest free slot found within checkWindowHours when
	// the requested slot is unavailable, or the preferred (conflict-free) slot
	// when running in preemption mode.
	NextSlot *time.Time `json:"next_slot,omitempty"`
	Warnings []string   `json:"warnings,omitempty"`
	// Preemptible is true when the check was run in preemption mode.
	Preemptible bool `json:"preemptible,omitempty"`
}

// bookingResource is the minimum info needed to verify a resource against the
// planner cache.
type bookingResource struct {
	id         string
	peerID     string
	instanceID string // resolved from WorkflowSchedule.SelectedInstances
}

// Check verifies that all booking-relevant resources (storage and compute) of
// the given workflow have capacity for the requested time slot.
//
//   - asap=true  → ignore ws.Start, begin searching from time.Now()
//   - preemption → always return Available=true but populate Warnings with
//     conflicts and NextSlot with the nearest conflict-free alternative
func (ws *WorkflowSchedule) Check(wfID string, asap bool, preemption bool, request *tools.APIRequest) (*CheckResult, error) {
	// 1. Load workflow
	obj, code, err := workflow.NewAccessor(request).LoadOne(wfID)
	if code != 200 || err != nil {
		msg := "could not load workflow " + wfID
		if err != nil {
			msg += ": " + err.Error()
		}
		return nil, errors.New(msg)
	}
	wf := obj.(*workflow.Workflow)

	// 2. Resolve start
	start := ws.Start
	if asap || start.IsZero() {
		start = time.Now()
	}

	// 3. Resolve end – use explicit end/duration or estimate via Planify
	end := ws.End
	if end == nil {
		if ws.DurationS > 0 {
			e := start.Add(time.Duration(ws.DurationS * float64(time.Second)))
			end = &e
		} else {
			_, longest, _, _, planErr := wf.Planify(
				start, nil,
				ws.SelectedInstances, ws.SelectedPartnerships,
				ws.SelectedBuyings, ws.SelectedStrategies,
				int(ws.BookingMode), request,
			)
			if planErr == nil && longest > 0 {
				e := start.Add(time.Duration(longest) * time.Second)
				end = &e
			}
		}
	}

	// 4. Extract booking-relevant (storage + compute) resources from the graph,
	//    resolving the selected instance for each resource.
	checkables := collectBookingResources(wf, ws.SelectedInstances)

	// 5. Check every resource against its peer's planner
	unavailable, warnings := checkResourceAvailability(checkables, start, end)

	result := &CheckResult{
		Start:    start,
		End:      end,
		Warnings: warnings,
	}

	// 6. Preemption mode: mark as schedulable regardless of conflicts, but
	//    surface warnings and the nearest conflict-free alternative.
	if preemption {
		result.Available = true
		result.Preemptible = true
		if len(unavailable) > 0 {
			result.NextSlot = findNextSlot(checkables, start, end, checkWindowHours)
		}
		return result, nil
	}

	// 7. All resources are free
	if len(unavailable) == 0 {
		result.Available = true
		return result, nil
	}

	// 8. Slot unavailable – locate the nearest free slot within the window
	result.Available = false
	result.NextSlot = findNextSlot(checkables, start, end, checkWindowHours)
	return result, nil
}

// collectBookingResources returns unique storage and compute resources from the
// workflow graph. For each resource the selected instance ID is resolved from
// selectedInstances (the scheduler's SelectedInstances ConfigItem) so the planner
// check targets the exact instance chosen by the user.
func collectBookingResources(wf *workflow.Workflow, selectedInstances workflow.ConfigItem) []bookingResource {
	if wf.Graph == nil {
		return nil
	}
	seen := map[string]bool{}
	var result []bookingResource

	resolveInstanceID := func(res interface {
		GetID() string
		GetCreatorID() string
	}) string {
		idx := selectedInstances.Get(res.GetID())
		switch r := res.(type) {
		case *resources.StorageResource:
			if inst := r.GetSelectedInstance(idx); inst != nil {
				return inst.GetID()
			}
		case *resources.ComputeResource:
			if inst := r.GetSelectedInstance(idx); inst != nil {
				return inst.GetID()
			}
		}
		return ""
	}

	for _, item := range wf.GetGraphItems(wf.Graph.IsStorage) {
		i := item
		_, res := i.GetResource()
		if res == nil {
			continue
		}
		id, peerID := res.GetID(), res.GetCreatorID()
		if peerID == "" || seen[id] {
			continue
		}
		seen[id] = true
		result = append(result, bookingResource{
			id:         id,
			peerID:     peerID,
			instanceID: resolveInstanceID(res),
		})
	}

	for _, item := range wf.GetGraphItems(wf.Graph.IsCompute) {
		i := item
		_, res := i.GetResource()
		if res == nil {
			continue
		}
		id, peerID := res.GetID(), res.GetCreatorID()
		if peerID == "" || seen[id] {
			continue
		}
		seen[id] = true
		result = append(result, bookingResource{
			id:         id,
			peerID:     peerID,
			instanceID: resolveInstanceID(res),
		})
	}

	return result
}

// checkResourceAvailability returns the IDs of unavailable resources and
// human-readable warning messages.
func checkResourceAvailability(res []bookingResource, start time.Time, end *time.Time) (unavailable []string, warnings []string) {
	for _, r := range res {
		plannerMu.RLock()
		p := PlannerCache[r.peerID]
		plannerMu.RUnlock()
		if p == nil {
			warnings = append(warnings, fmt.Sprintf(
				"peer %s planner not in cache for resource %s – assuming available", r.peerID, r.id))
			continue
		}
		if !checkInstance(p, r.id, r.instanceID, start, end) {
			unavailable = append(unavailable, r.id)
			warnings = append(warnings, fmt.Sprintf(
				"resource %s is not available in [%s – %s]",
				r.id, start.Format(time.RFC3339), formatOptTime(end)))
		}
	}
	return
}

// checkInstance checks availability for the specific instance resolved by the
// scheduler. When instanceID is empty (no instance selected / none resolvable),
// it falls back to checking all instances known in the planner and returns true
// if any one has remaining capacity. Returns true when no capacity is recorded.
func checkInstance(p *planner.Planner, resourceID string, instanceID string, start time.Time, end *time.Time) bool {
	if instanceID != "" {
		return p.Check(resourceID, instanceID, nil, start, end)
	}
	// Fallback: accept if any known instance has free capacity
	caps, ok := p.Capacities[resourceID]
	if !ok || len(caps) == 0 {
		return true // no recorded usage → assume free
	}
	for id := range caps {
		if p.Check(resourceID, id, nil, start, end) {
			return true
		}
	}
	return false
}

// findNextSlot scans forward from 'from' in checkStepMin increments for up to
// windowH hours and returns the first candidate start time at which all
// resources are simultaneously free.
func findNextSlot(resources []bookingResource, from time.Time, originalEnd *time.Time, windowH int) *time.Time {
	duration := time.Hour
	if originalEnd != nil {
		if d := originalEnd.Sub(from); d > 0 {
			duration = d
		}
	}
	step := time.Duration(checkStepMin) * time.Minute
	limit := from.Add(time.Duration(windowH) * time.Hour)
	for t := from.Add(step); t.Before(limit); t = t.Add(step) {
		e := t.Add(duration)
		if unavail, _ := checkResourceAvailability(resources, t, &e); len(unavail) == 0 {
			return &t
		}
	}
	return nil
}

func formatOptTime(t *time.Time) string {
	if t == nil {
		return "open"
	}
	return t.Format(time.RFC3339)
}

// GetWorkflowPeerIDs loads the workflow and returns the deduplicated list of
// creator peer IDs for all its storage and compute resources.
// These are the peers whose planners must be watched by a check stream.
func GetWorkflowPeerIDs(wfID string, request *tools.APIRequest) ([]string, error) {
	obj, code, err := workflow.NewAccessor(request).LoadOne(wfID)
	if code != 200 || err != nil {
		msg := "could not load workflow " + wfID
		if err != nil {
			msg += ": " + err.Error()
		}
		return nil, errors.New(msg)
	}
	wf := obj.(*workflow.Workflow)
	if wf.Graph == nil {
		return nil, nil
	}
	seen := map[string]bool{}
	var peerIDs []string
	for _, item := range wf.GetGraphItems(wf.Graph.IsStorage) {
		i := item
		_, res := i.GetResource()
		if res == nil {
			continue
		}
		if id := res.GetCreatorID(); id != "" && !seen[id] {
			seen[id] = true
			peerIDs = append(peerIDs, id)
		}
	}
	for _, item := range wf.GetGraphItems(wf.Graph.IsCompute) {
		i := item
		_, res := i.GetResource()
		if res == nil {
			continue
		}
		if id := res.GetCreatorID(); id != "" && !seen[id] {
			seen[id] = true
			peerIDs = append(peerIDs, id)
		}
	}
	realPeersID := []string{}
	access := oclib.NewRequestAdmin(oclib.LibDataEnum(tools.PEER), nil)
	for _, id := range peerIDs {
		if data := access.LoadOne(id); data.Data != nil {
			realPeersID = append(realPeersID, data.ToPeer().PeerID)
		}
	}
	return realPeersID, nil
}