package hostops

import (
	"github.com/carlosframework/platform/internal/hostclaim"
	"github.com/carlosframework/platform/internal/park"
	"strconv"
	"strings"
)

const MoveLossReplicaBaseline = "replica:"
const MoveLossSealBaseline = "seal:"

// ParseMoveLossBaseline is shared by the frozen-source writer and validators.
func ParseMoveLossBaseline(value string) (kind, region, identity string, err error) {
	if strings.HasPrefix(value, MoveLossReplicaBaseline) {
		r, g, ok := strings.Cut(strings.TrimPrefix(value, MoveLossReplicaBaseline), "/")
		if ok && r != "" && g != "" && !strings.Contains(g, "/") {
			return "replica", r, g, nil
		}
	}
	if strings.HasPrefix(value, MoveLossSealBaseline) {
		id := strings.TrimPrefix(value, MoveLossSealBaseline)
		if id != "" && !strings.Contains(id, "/") {
			return "seal", "", id, nil
		}
	}
	return "", "", "", hostclaim.ErrLossRecord
}

// MoveLossRecoveryOwner shares the resolve owner's signed-intent policy with boxes.
// This policy is pure; it exposes neither the console store nor mutation grants.
func MoveLossRecoveryOwner() hostclaim.LossRecoveryOwner { return &moveLossOwner{} }

func (m *moveLossOwner) ValidateLossRecovery(c hostclaim.Claim, loss hostclaim.LossRecord, a hostclaim.Admission) error {
	in, _, err := lossIntentOf(loss)
	if err != nil {
		return err
	}
	stamp, err := strconv.ParseUint(c.Op.Journal[hostclaim.JournalSourceStamp], 10, 64)
	if err != nil || stamp == 0 || c.Holder == nil || c.Holder.Stamp != stamp ||
		c.Holder.Incarnation != in.Incarnation || c.Holder.Key != in.RecordKey ||
		c.Op.ID != in.Move || c.Op.Kind != hostclaim.KindRestoring || c.Op.Phase != hostclaim.PhaseProbing ||
		c.Op.Intent["rollback"] != in.Rollback || c.Op.Exec != in.Source || c.Op.Intent["source"] != in.Source ||
		c.Op.Intent["target"] != in.Target || c.Op.Intent["to"] != in.TargetRegion ||
		!hostclaim.LostTargetReleased(&c, loss.ID) || a.Box != in.Source || !park.SameRegion(c.Op.Intent["home_region"], a.Region, in.SourceRegion) ||
		a.Mode != "cold" || a.Coverage != "" || a.KeepStamp || a.PredecessorCertified {
		return hostclaim.ErrLossRecord
	}
	return nil
}