#!/bin/bash

# Initialize variables
hostname=""    # Appliance hostname
mode=""        # Static or dhcp
address=""     # IP address in CIDR format
gateway=""     # Gateway address
dnsservers=""  # Dns servers separated by commas
port=""        # NGINX port

netplan_config="/etc/netplan/99-appliance-network.yaml"
cloud_init_config="/etc/netplan/50-cloud-init.yaml"

printmsg () {
  echo $1 | systemd-cat -p $2 -t "appliance-bootstrap"
}

# Parse arguments
while true; do
  case "$1" in
    -n | --hostname )
      hostname="$2"
      shift 2
      ;;
    -m | --mode )
      mode="$2"
      shift 2
      ;;
    -a | --address )
      address="$2"
      shift 2
      ;;
    -g | --gateway )
      gateway="$2"
      shift 2
      ;;
    -d | --dnsservers )
      dnsservers="$2"
      shift 2
      ;;
    -p | --port )
      port="$2"
      shift 2
      ;;
    * )
      break
      ;;
  esac
done

# echo "mode:       $mode"
# echo "address:    $address"
# echo "gateway:    $gateway"
# echo "dnsservers: $dnsservers"
# echo "port:       $port"

if [ -n "$hostname" ]; then
  printmsg "Info: Setting Hostname to $hostname" "info"
  hostnamectl set-hostname $hostname
fi

# Generate netplan config
case "$mode" in
  dhcp)
    printmsg "Info: Configuring network via DHCP" "info"
    cat > $netplan_config <<EOF
network:
  version: 2
  renderer: NetworkManager
  ethernets:
    enp1s0:
      dhcp4: yes
EOF
    ;;
  static)
    printmsg "Info: Configuring network with Static address $address, gateway: $gateway, and dns: $dnsservers" "info"
    cat > $netplan_config <<EOF
network:
  version: 2
  renderer: NetworkManager
  ethernets:
    enp1s0:
      addresses:
      - $address
      gateway4: $gateway
      nameservers:
        addresses: [ $dnsservers ]
EOF
    ;;
  * )
    ;;
esac

# Apply netplan
ls $cloud_init_config &> /dev/null
if [ $? -eq 0 ]; then
  rm -f $cloud_init_config
fi

ls $netplan_config &> /dev/null
if [ $? -eq 0 ]; then
  chmod 0600 $netplan_config
fi

netplan generate
netplan apply

# Configure Nginx application
if [ -n "$port" ]; then
  printmsg "Info: Configuring Nginx with port: $port" "info"
  save-app-config.sh $port
fi

exit 0