package compositions

import (
	seat "git.novox.be/novox/mesh-contracts/go/seats/nodeengine"
	"git.novox.be/novox/mesh-contracts/identity-and-access/go/clients/meshvaultclient"
)

// The bounds of a module's shown bodies in a candidate answer, and of one answer as the node's key holds it (the node-engine
// seat's state have, key `<node>.node`, takes a value of about 1 MiB and holds every proposal's answer beside the node's
// facts, so one answer keeps to a sixth).
const (
	MaxBodies      = 20
	MaxBody        = 8192
	MaxPaths       = 64
	MaxAnswerBytes = 160 << 10
)

// ReturnsToNothing is what a node answers a proposal that takes its placement key away.
const ReturnsToNothing = "the proposal takes this node's placement away: it composes nothing then"

// NodeWord is the last part of a node's own key, and the name of its own composition in an answer.
const NodeWord = "node"

// VerdictOf is the verdict of an answer's lists: refused on any refusal, differs on any difference, addition or
// removal, same otherwise.
func VerdictOf(a seat.CandidateAnswer) string {
	switch {
	case a.Refused != "" || len(a.Refusals) > 0:
		return seat.CandidateAnswerVerdictRefused
	case len(a.Differs)+len(a.Added)+len(a.Removed) > 0:
		return seat.CandidateAnswerVerdictDiffers
	}
	return seat.CandidateAnswerVerdictSame
}

// WithValuesDiffer is answers with each one's ValuesDiffer counted: how many shown bodies hold a value the node opened on
// both sides to two values (the vault's value and the one that runs drifted apart; issue 1126, cause C4).
func WithValuesDiffer(answers map[string]seat.CandidateAnswer) map[string]seat.CandidateAnswer {
	out := make(map[string]seat.CandidateAnswer, len(answers))
	for g, a := range answers {
		var shown []meshvaultclient.ModuleBodies
		for _, d := range a.Differs {
			m := meshvaultclient.ModuleBodies{Module: d.Module}
			for _, b := range d.Bodies {
				m.Bodies = append(m.Bodies, meshvaultclient.Body{ID: b.ID, Composed: b.Composed, Running: b.Running})
			}
			shown = append(shown, m)
		}
		a.ValuesDiffer = int64(meshvaultclient.ValuesDiffer(shown))
		out[g] = a
	}
	return out
}