package host

import (
	"github.com/carlosframework/platform/internal/hostbox"
	"github.com/carlosframework/platform/internal/hostguard"
	"github.com/carlosframework/platform/internal/registry"
)

// relocationSourceRows sets the box's Reconciler hooks for region HA
// §5.3 (R5-3, Task 10b), with CARLOS_REGION_HA on only: FenceClosed reads
// this box's admission fence for the host from the host guard
// (hostbox.AdmissionFenceClosed), and HoldRow holds the row for the op in
// "relocating" (hostbox.RegistryHoldRow). The source in releasing is then
// held at its fence's close, and every other relocating participant keeps
// an existing row held. A source whose reconcile is delayed past the
// completion is held then, for the completed op, by reconcile's catch-up
// hold while it owes that op's park-local (L18 joint round, finding 3).
// Nothing here releases a source's hold: the fenced installation never
// serves again, so the completion queues the source's park-local
// (hostclaim.CompleteRelocation), whose retirement deletes the row by
// ownership, held or not. With the flag off both hooks
// stay nil and reconcile is main's: Serving alone, which refuses every
// relocating claim with every row unchanged.
func relocationSourceRows(getenv func(string) string, r *hostbox.Reconciler, guard hostguard.Guard, reg *registry.Registry) {
	if r == nil {
		return
	}
	r.FenceClosed, r.HoldRow = nil, nil
	if getenv == nil || !regionHAEnabled(getenv) {
		return
	}
	r.FenceClosed = hostbox.AdmissionFenceClosed(guard)
	r.HoldRow = hostbox.RegistryHoldRow(reg)
}