#!/bin/bash
# Test interface detection logic (no root required)

echo "Testing Interface Detection Logic"
echo "================================="
echo ""

# Get all physical interfaces
PHYSICAL_IFACES=()
for iface in /sys/class/net/*; do
    iface_name=$(basename "$iface")
    
    # Skip loopback, virtual interfaces, bridges, bonds, and VLANs
    if [[ "$iface_name" == "lo" ]] || \
       [[ -L "$iface/device" ]] && [[ ! -d "$iface/device" ]] || \
       [[ -d "$iface/bridge" ]] || \
       [[ -d "$iface/bonding" ]] || \
       [[ "$iface_name" =~ \. ]]; then
        continue
    fi
    
    # Check if it's a physical interface
    if [ -d "$iface/device" ] || [ -L "$iface/device" ]; then
        PHYSICAL_IFACES+=("$iface_name")
    fi
done

# Sort interfaces for consistent selection
IFS=$'\n' PHYSICAL_IFACES=($(sort <<<"${PHYSICAL_IFACES[*]}"))
unset IFS

echo "Detected Physical Interfaces:"
for i in "${!PHYSICAL_IFACES[@]}"; do
    idx=$((i+1))
    iface="${PHYSICAL_IFACES[$i]}"
    if [ $idx -eq 1 ]; then
        echo "  NIC $idx (LAN): $iface → vmbr0"
    elif [ $idx -eq 2 ]; then
        echo "  NIC $idx (WAN): $iface → vmbr1"
    else
        echo "  NIC $idx (unused): $iface"
    fi
done

echo ""
if [ ${#PHYSICAL_IFACES[@]} -ge 2 ]; then
    NIC1="${PHYSICAL_IFACES[0]}"
    NIC2="${PHYSICAL_IFACES[1]}"
    
    echo "Configuration Preview:"
    echo "======================"
    echo ""
    cat <<EOF
# NIC 1 (LAN) - Physical interface
auto $NIC1
iface $NIC1 inet manual

# vmbr0 (LAN Bridge) - Connected to 192.168.1.0/24 network
auto vmbr0
iface vmbr0 inet dhcp
    bridge-ports $NIC1
    bridge-stp off
    bridge-fd 0
    bridge-vlan-aware no
    metric 200

# NIC 2 (WAN) - Physical interface
auto $NIC2
iface $NIC2 inet manual

# vmbr1 (WAN Bridge) - Connected to Spectrum cable modem
auto vmbr1
iface vmbr1 inet dhcp
    bridge-ports $NIC2
    bridge-stp off
    bridge-fd 0
    bridge-vlan-aware no
    metric 100
EOF
else
    echo "⚠️  Warning: Need at least 2 physical interfaces"
    echo "   Found: ${#PHYSICAL_IFACES[@]}"
fi