package peer

import (
	"log"
	"time"

	"vppn/peer/control"
	"vppn/peer/wginterface"
)

func (a *App) onTick() {
	wgPeers := a.devPeers()

	now := time.Now().UnixNano()

	for _, wgPeer := range wgPeers {
		p, ok := a.peersByKey[wgPeer.PublicKey]
		if !ok {
			log.Printf("Wireguard peer not in index, removing: %v", wgPeer)
			a.devRemove(&Peer{wgPeer: wgPeer})
			continue
		}
		p.wgPeer = wgPeer

		// Send pings to peers where we're the client.
		if p.Role == control.Client {
			a.sendPing(p, now)
		}

		switch p.State() {
		case StateProbing:
			// Promote probing peers to direct once alive (direct path confirmed
			// working).
			if time.Since(p.LastHandshakeTime()) < wginterface.SessionTimeout {
				a.devAddDirect(p, p.WGEndpoint())
			}

		case StateDirect:
			// Demote stale non-public direct peers back to probing.
			if !p.IsPublic && !p.Up() {
				a.devAddProbe(p, p.WGEndpoint())
			}
		}
	}

	// Ensure we have a live relay.
	if a.relay == nil || !a.relay.Up() {
		a.switchActiveRelay()
	}
}