# add_client <IP>
IP=$1

# If a client config file is already present, return
if [[ -f /etc/wireguard/client/wg0.conf ]]
then
        echo "client/wg0.conf already exists. Please consider moving it to another place or deleting it"
        exit 1
fi

# generate client key pair
private_key=$(wg genkey)
public_key=$(echo $private_key | wg pubkey)

# write updated server config to temp-file
cp /etc/wireguard/wg0.conf /etc/wireguard/wg0-temp.conf
echo "
[Peer]
PublicKey = $public_key
AllowedIPs = $IP/32
" >> /etc/wireguard/wg0-temp.conf

# restart wireguard with updated conf
wg-quick down wg0
mv /etc/wireguard/wg0-temp.conf /etc/wireguard/wg0.conf
wg-quick up wg0

mkdir /etc/wireguard/client

# generate client config file
echo "[Interface]
Address = $IP/24
PrivateKey = $private_key
MTU = 1280
DNS = 192.168.2.1

[Peer]
PublicKey = {{ wireguard_server_pubkey }}
AllowedIPs = 0.0.0.0/0
Endpoint = {{ wireguard_server_endpoint }}:51900
PersistentKeepalive = 30
" > /etc/wireguard/client/wg0.conf

# output client conf as QR-Code
qrencode -r /etc/wireguard/client/wg0.conf -t ansiutf8