#!/bin/bash

set -e -x

set -o pipefail

mkdir -p logs

NETWORK="nebula-smoke-relay"

cleanup() {
    echo
    echo " *** cleanup"
    echo

    set +e
    if [ "$(jobs -r)" ]
    then
        docker kill lighthouse1 host2 host3 host4
    fi
    docker network rm "$NETWORK" >/dev/null 2>&1
}

trap cleanup EXIT

# Create a dedicated smoke network with an explicit subnet (required for --ip
# below). Probe a short list of candidates so a locally-used range doesn't
# fail the whole test — we only need one to be free.
docker network rm "$NETWORK" >/dev/null 2>&1 || true
for candidate in 172.30.0.0/24 172.31.0.0/24 10.98.0.0/24 10.99.0.0/24 192.168.230.0/24; do
    if docker network create --subnet "$candidate" "$NETWORK" >/dev/null 2>&1; then
        break
    fi
done
if ! docker network inspect "$NETWORK" >/dev/null 2>&1; then
    echo "failed to create $NETWORK: every candidate subnet is in use" >&2
    exit 1
fi

# Derive container IPs from the network's assigned subnet. Slots: .2 lighthouse1,
# .3 host2, .4 host3, .5 host4 — matches the placeholders in build-relay.sh.
SUBNET="$(docker network inspect -f '{{(index .IPAM.Config 0).Subnet}}' "$NETWORK")"
PREFIX="${SUBNET%/*}"
PREFIX="${PREFIX%.*}"
LIGHTHOUSE_IP="$PREFIX.2"
HOST2_IP="$PREFIX.3"
HOST3_IP="$PREFIX.4"
HOST4_IP="$PREFIX.5"

# Sed the placeholder TEST-NET-3 IPs in the host configs to the real ones.
for f in build/host2.yml build/host3.yml build/host4.yml; do
    sed "s|203\.0\.113\.|$PREFIX.|g" "$f" >"$f.tmp"
    mv "$f.tmp" "$f"
done

docker run --name lighthouse1 --rm nebula:smoke-relay -config lighthouse1.yml -test
docker run --name host2 --rm -v "$PWD/build/host2.yml:/nebula/host2.yml:ro" nebula:smoke-relay -config host2.yml -test
docker run --name host3 --rm -v "$PWD/build/host3.yml:/nebula/host3.yml:ro" nebula:smoke-relay -config host3.yml -test
docker run --name host4 --rm -v "$PWD/build/host4.yml:/nebula/host4.yml:ro" nebula:smoke-relay -config host4.yml -test

docker run --name lighthouse1 --network "$NETWORK" --ip "$LIGHTHOUSE_IP" --device /dev/net/tun:/dev/net/tun --cap-add NET_ADMIN --rm nebula:smoke-relay -config lighthouse1.yml 2>&1 | tee logs/lighthouse1 | sed -u 's/^/  [lighthouse1]  /' &
sleep 1
docker run --name host2 --network "$NETWORK" --ip "$HOST2_IP" -v "$PWD/build/host2.yml:/nebula/host2.yml:ro" --device /dev/net/tun:/dev/net/tun --cap-add NET_ADMIN --rm nebula:smoke-relay -config host2.yml 2>&1 | tee logs/host2 | sed -u 's/^/  [host2]  /' &
sleep 1
docker run --name host3 --network "$NETWORK" --ip "$HOST3_IP" -v "$PWD/build/host3.yml:/nebula/host3.yml:ro" --device /dev/net/tun:/dev/net/tun --cap-add NET_ADMIN --rm nebula:smoke-relay -config host3.yml 2>&1 | tee logs/host3 | sed -u 's/^/  [host3]  /' &
sleep 1
docker run --name host4 --network "$NETWORK" --ip "$HOST4_IP" -v "$PWD/build/host4.yml:/nebula/host4.yml:ro" --device /dev/net/tun:/dev/net/tun --cap-add NET_ADMIN --rm nebula:smoke-relay -config host4.yml 2>&1 | tee logs/host4 | sed -u 's/^/  [host4]  /' &
sleep 1

set +x
echo
echo " *** Testing ping from lighthouse1"
echo
set -x
docker exec lighthouse1 ping -c1 192.168.100.2
docker exec lighthouse1 ping -c1 192.168.100.3
docker exec lighthouse1 ping -c1 192.168.100.4

set +x
echo
echo " *** Testing ping from host2"
echo
set -x
docker exec host2 ping -c1 192.168.100.1
# Should fail because no relay configured in this direction
! docker exec host2 ping -c1 192.168.100.3 -w5 || exit 1
! docker exec host2 ping -c1 192.168.100.4 -w5 || exit 1

set +x
echo
echo " *** Testing ping from host3"
echo
set -x
docker exec host3 ping -c1 192.168.100.1
docker exec host3 ping -c1 192.168.100.2
docker exec host3 ping -c1 192.168.100.4

set +x
echo
echo " *** Testing ping from host4"
echo
set -x
docker exec host4 ping -c1 192.168.100.1
# Should fail because relays not allowed
! docker exec host4 ping -c1 192.168.100.2 -w5 || exit 1
docker exec host4 ping -c1 192.168.100.3

docker exec host4 sh -c 'kill 1'
docker exec host3 sh -c 'kill 1'
docker exec host2 sh -c 'kill 1'
docker exec lighthouse1 sh -c 'kill 1'

# Wait up to 30s for all backgrounded jobs to exit rather than relying on a
# fixed sleep.
for _ in $(seq 1 30); do
    [ -z "$(jobs -r)" ] && break
    sleep 1
done

if [ "$(jobs -r)" ]
then
    echo "nebula still running after SIGTERM sent" >&2
    exit 1
fi