#!/usr/bin/env bash
# Run on the hypervisor (satbox) to create bridge br1.40 and attach your VLAN 40 interface.
# Create the VLAN interface manually first, e.g.:
#   ip link add link eth1 name eth1.40 type vlan id 40
#
# Usage:
#   sudo ./setup-vlan40-bridge.sh eth1.40
#   sudo VLAN_IF=eth1.40 ./setup-vlan40-bridge.sh
#
# Make persistent via systemd-networkd (see docs/vlan40-bridge-systemd-networkd.md).

set -e

VLAN_IF="${1:-$VLAN_IF}"
BRIDGE="br1.40"

if [[ -z "$VLAN_IF" ]]; then
  echo "Usage: $0 <vlan_interface>   (e.g. eth1.40)"
  echo "   or: VLAN_IF=eth1.40 $0"
  echo "Create the VLAN interface manually first: ip link add link eth1 name eth1.40 type vlan id 40"
  exit 1
fi

if ! ip link show "$VLAN_IF" &>/dev/null; then
  echo "Interface $VLAN_IF not found. Create it first, e.g.:"
  echo "  ip link add link eth1 name eth1.40 type vlan id 40"
  exit 1
fi

echo "=== Creating bridge $BRIDGE and attaching $VLAN_IF ==="

# 1) Create bridge if it doesn't exist
if ! ip link show "$BRIDGE" &>/dev/null; then
  echo "Creating bridge $BRIDGE..."
  ip link add name "$BRIDGE" type bridge
  ip link set "$BRIDGE" up
else
  echo "Bridge $BRIDGE already exists."
  ip link set "$BRIDGE" up 2>/dev/null || true
fi

# 2) Attach VLAN interface to bridge
if ! ip link show "$VLAN_IF" | grep -q "master $BRIDGE"; then
  ip link set "$VLAN_IF" master "$BRIDGE"
  ip link set "$VLAN_IF" up
else
  ip link set "$VLAN_IF" up 2>/dev/null || true
fi

echo ""
echo "Done. $VLAN_IF is on bridge $BRIDGE."
echo "Optionally assign an IP to $BRIDGE if this host must be on VLAN 40, e.g.:"
echo "  ip addr add 192.168.40.254/24 dev $BRIDGE"
echo ""
echo "Deploy Rina VM on this bridge with:"
echo "  BRIDGE=$BRIDGE ./deploy-rina-vm.sh"
echo "(Or use systemd-networkd for persistent config; see docs/vlan40-bridge-systemd-networkd.md)"
echo ""