#!/usr/bin/env bash
set -euo pipefail

# UltraCloud VM Cluster - Node 01 (ISO Boot + Dual Networking)
# Features:
#   - Multicast socket for inter-VM L2 communication (eth0)
#   - SLIRP with SSH port forward for host access (eth1)
#   - Telnet serial console (no VNC required)

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
DISK="${SCRIPT_DIR}/node01.qcow2"
ISO="${SCRIPT_DIR}/isos/latest-nixos-minimal-x86_64-linux.iso"

# Networking
MAC_MCAST="52:54:00:12:34:01"        # eth0: multicast (192.168.100.11)
MAC_SLIRP="52:54:00:aa:bb:01"        # eth1: SLIRP DHCP (10.0.2.15)
MCAST_ADDR="230.0.0.1:1234"
SSH_PORT=2201                        # Host port -> VM port 22

# Console access
VNC_DISPLAY=":1"                     # VNC fallback
SERIAL_PORT=4401                     # Telnet serial

# Verify ISO exists
if [ ! -f "$ISO" ]; then
    echo "ERROR: ISO not found at $ISO"
    echo "Download with: wget -O $ISO https://channels.nixos.org/nixos-unstable/latest-nixos-minimal-x86_64-linux.iso"
    exit 1
fi

echo "============================================"
echo "Launching node01 with dual networking..."
echo "============================================"
echo "  Disk: ${DISK}"
echo "  ISO: ${ISO}"
echo ""
echo "Network interfaces:"
echo "  eth0 (mcast):  MAC ${MAC_MCAST} -> configure 192.168.100.11"
echo "  eth1 (SLIRP):  MAC ${MAC_SLIRP} -> DHCP (10.0.2.x), SSH on host:${SSH_PORT}"
echo ""
echo "Console access:"
echo "  Serial: telnet localhost ${SERIAL_PORT}"
echo "  VNC:    vncviewer localhost${VNC_DISPLAY} (port 5901)"
echo "  SSH:    ssh -o StrictHostKeyChecking=no -p ${SSH_PORT} nixos@localhost"
echo ""
echo "After boot, configure networking:"
echo "  1. telnet localhost ${SERIAL_PORT}"
echo "  2. Login as root (empty password in installer)"
echo "  3. passwd nixos   # Set password for SSH"
echo "  4. SSH should then work via port ${SSH_PORT}"
echo "============================================"

qemu-system-x86_64 \
  -name node01 \
  -machine type=q35,accel=kvm \
  -cpu host \
  -smp 8 \
  -m 16G \
  -drive file="${DISK}",if=virtio,format=qcow2 \
  -cdrom "${ISO}" \
  -boot d \
  -netdev socket,mcast="${MCAST_ADDR}",id=mcast0 \
  -device virtio-net-pci,netdev=mcast0,mac="${MAC_MCAST}" \
  -netdev user,id=user0,hostfwd=tcp::${SSH_PORT}-:22 \
  -device virtio-net-pci,netdev=user0,mac="${MAC_SLIRP}" \
  -vnc "${VNC_DISPLAY}" \
  -serial mon:telnet:127.0.0.1:${SERIAL_PORT},server,nowait \
  -daemonize

echo ""
echo "VM started! Connect via:"
echo "  telnet localhost ${SERIAL_PORT}"
