#!/bin/bash
# Tear down the lab network simulation.
#
# By default this destroys VMs and networks but KEEPS the downloaded base
# image, so the next bring-up is fast. Pass --purge to remove that too.
#
# Usage: ./labsim-down.sh [--purge] [vlan-id ...]
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
source "$SCRIPT_DIR/lib.sh"
source "$SCRIPT_DIR/ovs.sh"

PURGE=false
ARGS=()
for a in "$@"; do
  case "$a" in
    --purge) PURGE=true ;;
    *) ARGS+=("$a") ;;
  esac
done

selected_vlans "${ARGS[@]+"${ARGS[@]}"}"

for entry in "${SELECTED[@]}"; do
  IFS=: read -r vid name prefix _r <<<"$entry"
  vm="$(vm_name "$vid" "$name")"

  if virsh_q dominfo "$vm" >/dev/null 2>&1; then
    log "destroying VM $vm"
    virsh_q destroy "$vm" >/dev/null 2>&1 || true
    virsh_q undefine "$vm" --nvram >/dev/null 2>&1 || virsh_q undefine "$vm" >/dev/null 2>&1 || true
  fi
  sudo rm -f "$IMG_DIR/${vm}.qcow2" "$IMG_DIR/${vm}-seed.iso"

done

# Legacy per-VLAN Linux-bridge networks from before the OVS migration. If
# these survive they keep a duplicate <prefix>.2/24 on a dead bridge, and the
# kernel may prefer that route over the OVS host leg — which looks exactly
# like "the VM is unreachable" while ping -I hostvN works fine.
for entry in "${SELECTED[@]}"; do
  IFS=: read -r vid _n _p _r <<<"$entry"
  legacy="labsim-vlan${vid}"
  if virsh_q net-info "$legacy" >/dev/null 2>&1; then
    log "removing legacy network $legacy"
    virsh_q net-destroy "$legacy" >/dev/null 2>&1 || true
    virsh_q net-undefine "$legacy" >/dev/null 2>&1 || true
  fi
done

log "removing OVS fabric"
ovs_down

if [ "$PURGE" = true ]; then
  log "purging base image $BASE_IMAGE"
  sudo rm -f "$BASE_IMAGE"
  sudo rmdir "$IMG_DIR" 2>/dev/null || true
fi

log "environment is DOWN"