package host

import (
	"errors"
	"github.com/carlosframework/platform/internal/hostclaim"
	"github.com/carlosframework/platform/internal/provision"
)

var errRootMigrationBusy = errors.New("root migration requires an idle, complete census")

// Call only on fresh authoritative records while admission is excluded.
// The caller also checks root journals and kernel reservations before writing.
func rootMigrationPreflight(complete bool, records []provision.Record, claims []hostclaim.Claim) error {
	if !complete {
		return errRootMigrationBusy
	}
	for _, rec := range records {
		// Committed still owns cleanup; MoveComplete clears Move when settled.
		if rec.Move != nil {
			return errRootMigrationBusy
		}
	}
	for _, claim := range claims {
		// Refuse every active operation, including unknown future kinds.
		if claim.Op.ID != "" || (claim.Op.Kind != "" && claim.Op.Kind != hostclaim.KindServing) || claim.Op.Phase != "" {
			return errRootMigrationBusy
		}
	}
	return nil
}