package nebula

import (
	"net/netip"
	"testing"
	"time"

	"github.com/slackhq/nebula/cert"
	"github.com/slackhq/nebula/header"
	"github.com/slackhq/nebula/test"
	"github.com/slackhq/nebula/udp"
	"github.com/stretchr/testify/assert"
)

func Test_NewHandshakeManagerVpnIp(t *testing.T) {
	l := test.NewLogger()
	vpncidr := netip.MustParsePrefix("172.1.1.1/24")
	localrange := netip.MustParsePrefix("10.1.1.1/24")
	ip := netip.MustParseAddr("172.1.1.2")

	preferredRanges := []netip.Prefix{localrange}
	mainHM := newHostMap(l, vpncidr)
	mainHM.preferredRanges.Store(&preferredRanges)

	lh := newTestLighthouse()

	cs := &CertState{
		RawCertificate:      []byte{},
		PrivateKey:          []byte{},
		Certificate:         &cert.NebulaCertificate{},
		RawCertificateNoKey: []byte{},
	}

	blah := NewHandshakeManager(l, mainHM, lh, &udp.NoopConn{}, defaultHandshakeConfig)
	blah.f = &Interface{handshakeManager: blah, pki: &PKI{}, l: l}
	blah.f.pki.cs.Store(cs)

	now := time.Now()
	blah.NextOutboundHandshakeTimerTick(now)

	i := blah.StartHandshake(ip, nil)
	i2 := blah.StartHandshake(ip, nil)
	assert.Same(t, i, i2)

	i.remotes = NewRemoteList(nil)

	// Adding something to pending should not affect the main hostmap
	assert.Len(t, mainHM.Hosts, 0)

	// Confirm they are in the pending index list
	assert.Contains(t, blah.vpnIps, ip)

	// Jump ahead `HandshakeRetries` ticks, offset by one to get the sleep logic right
	for i := 1; i <= DefaultHandshakeRetries+1; i++ {
		now = now.Add(time.Duration(i) * DefaultHandshakeTryInterval)
		blah.NextOutboundHandshakeTimerTick(now)
	}

	// Confirm they are still in the pending index list
	assert.Contains(t, blah.vpnIps, ip)

	// Tick 1 more time, a minute will certainly flush it out
	blah.NextOutboundHandshakeTimerTick(now.Add(time.Minute))

	// Confirm they have been removed
	assert.NotContains(t, blah.vpnIps, ip)
}

func testCountTimerWheelEntries(tw *LockingTimerWheel[netip.Addr]) (c int) {
	for _, i := range tw.t.wheel {
		n := i.Head
		for n != nil {
			c++
			n = n.Next
		}
	}
	return c
}

type mockEncWriter struct {
}

func (mw *mockEncWriter) SendMessageToVpnIp(t header.MessageType, st header.MessageSubType, vpnIp netip.Addr, p, nb, out []byte) {
	return
}

func (mw *mockEncWriter) SendVia(via *HostInfo, relay *Relay, ad, nb, out []byte, nocopy bool) {
	return
}

func (mw *mockEncWriter) SendMessageToHostInfo(t header.MessageType, st header.MessageSubType, hostinfo *HostInfo, p, nb, out []byte) {
	return
}

func (mw *mockEncWriter) Handshake(vpnIP netip.Addr) {}
