package buscompose

import (
	"git.novox.be/novox/mesh-sdk/go/asks"
	"git.novox.be/novox/mesh-sdk/go/catalogue"
)

// The node seat node-engine (novox/hq ADR 0563 §1): every node's engine holds it on its own bus account, and no module
// claims it. Its verbs and events are the catalogue's (catalogue.EngineVerbs), read here rather than copied.

// EngineSeat is the seat.
const EngineSeat = catalogue.EngineSeat

// engineGrants is what a node's engine is granted to hold its node seat and to ask the operator (ADR 0563 §1, §3): it
// answers its own node's verbs (the caller-named subjects are added beside them with every principal's), says the
// seat's events about its node, answers discovery for the seat, asks who answers what (the login shell's execute, ADR
// 0563 §6), and asks the operator under asks.EngineAsker(node) on the router's seat as its holder declares it, as any
// user of that seat is granted.
func engineGrants(p Principal) (pub, sub []string) {
	for _, v := range catalogue.EngineVerbs() {
		sub = append(sub, "mesh.seat."+EngineSeat+".tool."+v.Name+"."+p.Node)
	}
	for _, e := range catalogue.EngineEvents {
		pub = append(pub, "mesh.seat."+EngineSeat+".event."+e+"."+p.Node)
	}
	sub = append(sub, announcing(EngineSeat)...)
	pub = append(pub, discovering()...)
	tp, ts := seatTrafficGrants(SeatTrafficOf(asks.EngineAsker(p.Node), nil, p.Uses, nil))
	return append(pub, tp...), append(sub, ts...)
}