package resolution

import (
	"fmt"

	mcat "git.novox.be/novox/mesh-sdk/go/catalogue"
)

// UnknownFieldReason is why a module whose stored manifest has a key this reader does not know is left out of a
// machine's declaration, or "" when it is not. **A field set aside no longer leaves the module out** (novox/hq ADR 0578
// §6, which changes ADR 0262 here): the lenient decoder reads the rest, the reader names the field (SetAside), and the
// part that needs the field takes the newer package. Only a manifest not read past the field, which holds its name and
// version alone (ReadNoFurther), is still left out, since nothing of it could be composed.
func UnknownFieldReason(m mcat.Manifest) string {
	if !m.ReadNoFurther() {
		return ""
	}
	return m.Module + " uses a field this controller does not know (" + m.UnknownField() + "); it is left out " +
		"until the controller is updated: nothing of it is changed on its machines and its contributions to " +
		"other modules and its open ports stop. Its data is still backed up as this controller reads it, " +
		"which may not be what its newer manifest asks, and it still provides what it provides " +
		"(novox/hq ADR 0262)"
}

// backupView is what of a left-out module still reaches its machine: its data, so the backup holder
// keeps copying it, and the directories and accesses its data items name. No contribution, shell code
// or environment of its own: those are what leaving it out stops.
func backupView(m mcat.Manifest) mcat.Manifest {
	view := mcat.Manifest{Module: m.Module, Data: m.Data, Accesses: m.Accesses, BestEffort: true}
	for _, r := range m.Resources {
		if fmt.Sprint(r["type"]) == "directory" {
			view.Resources = append(view.Resources, r)
		}
	}
	return view
}