//go:build linux

package host

import (
	"context"

	"github.com/carlosframework/platform/internal/hostbox"
	"github.com/carlosframework/platform/internal/hostguard"
	"github.com/carlosframework/platform/internal/provision"
)

func (h ClaimRootHTTP) verifyServingHandoverDirectory(ctx context.Context, prior hostguard.FenceTarget, e hostbox.StopInventoryEntry, actual hostbox.Artifact) error {
	if h.servingParks == nil || h.servingParks.authority == nil {
		return hostbox.ErrChanged
	}
	authority, ok := h.servingParks.authority.(*servingParkRoot)
	if !ok {
		return hostbox.ErrChanged
	}
	l := authority.ledger
	if l == nil {
		return hostbox.ErrChanged
	}
	fs, ok := l.fs.(*servingParkFS)
	if !ok {
		return hostbox.ErrChanged
	}
	boot, err := fs.currentBoot()
	if err != nil || !validServingParkBootID(prior.BootID) {
		return hostbox.ErrChanged
	}
	if prior.BootID == boot {
		if actual.Dev != e.Device {
			return hostbox.ErrChanged
		}
		return ctx.Err()
	}
	slot, err := l.slot(servingParkAuthorization{Successor: servingArtifactIdentity{Host: prior.Host, Box: prior.Box}})
	if err != nil {
		return err
	}
	r, err := l.readHistorical(slot.Last)
	if err != nil {
		return err
	}
	s := r.Authorization.Successor
	if !r.Complete || s.Host != prior.Host || s.Box != prior.Box || s.Incarnation != prior.Incarnation || s.Stamp > prior.Stamp || e.Kind != "path" || e.ManagedRoot != "data" || e.RelativePath != "instances/"+provision.InstanceID(prior.Host) || e.Inode != r.Source.Directory.Inode || actual.Ino != e.Inode || actual.Type != 0040000 || e.Type != actual.Type {
		return hostbox.ErrChanged
	}
	if _, err := fs.readNamespace(); err != nil {
		return err
	}
	root, n, err := fs.namespace()
	if err != nil {
		return err
	}
	root.Close()
	parent, pid, err := fs.parent()
	if err != nil {
		return err
	}
	defer parent.Close()
	if pid != n.Parent {
		return hostbox.ErrChanged
	}
	source, err := servingParkOpenDir(parent, provision.InstanceID(prior.Host))
	if err != nil {
		return err
	}
	defer source.Close()
	id, err := fs.rebootDirectory(source, r.Source.Directory, r.Source.Persistent, pid)
	if err != nil || id.Device != actual.Dev || id.Inode != actual.Ino {
		return hostbox.ErrChanged
	}
	if err := fs.checkBoot(boot); err != nil {
		return err
	}
	return ctx.Err()
}