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

log() {
  printf '[rm] %s\n' "$*"
}

DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$DIR/dns.sh"
STATE="$DIR/state"
VM_ROOT="$STATE/vms"

usage() {
  cat <<'EOF'
Usage: ./rm.sh <id-or-name-prefix>...

Removes VM artifacts from state/ and cleans up TAP and mapped devices.
EOF
}

find_vm_json() {
  local query="$1"
  local vm_json match_count=0 match=""

  for vm_json in "$VM_ROOT"/*/vm.json; do
    [[ -f "$vm_json" ]] || continue
    local id name
    id="$(jq -r '.meta.id // empty' "$vm_json")"
    name="$(jq -r '.meta.name // empty' "$vm_json")"
    if [[ "$id" == "$query"* || "$name" == "$query"* ]]; then
      match="$vm_json"
      match_count=$((match_count + 1))
    fi
  done

  if (( match_count == 0 )); then
    log "no VM found for prefix: $query"
    exit 1
  fi
  if (( match_count > 1 )); then
    log "multiple VMs found for prefix: $query"
    exit 1
  fi

  printf '%s' "$match"
}

QUERIES=("$@")
if (( ${#QUERIES[@]} == 1 )) && [[ "${QUERIES[0]}" == "-h" || "${QUERIES[0]}" == "--help" ]]; then
  usage
  exit 0
fi
if (( ${#QUERIES[@]} == 0 )); then
  usage
  exit 1
fi

VM_JSONS=()
for query in "${QUERIES[@]}"; do
  VM_JSON="$(find_vm_json "$query")"
  already_added=0
  for existing_vm_json in "${VM_JSONS[@]}"; do
    if [[ "$existing_vm_json" == "$VM_JSON" ]]; then
      already_added=1
      break
    fi
  done
  if (( already_added == 0 )); then
    VM_JSONS+=("$VM_JSON")
  fi
done

for vm_json in "${VM_JSONS[@]}"; do
  vm_dir="$(dirname "$vm_json")"
  vm_id="$(jq -r '.meta.id // empty' "$vm_json")"
  vm_name="$(jq -r '.meta.name // empty' "$vm_json")"
  pid="$(jq -r '.meta.pid // empty' "$vm_json")"
  tap="$(jq -r '.meta.tap // empty' "$vm_json")"
  api_sock="$(jq -r '.meta.api_sock // empty' "$vm_json")"
  base_loop="$(jq -r '.meta.base_loop // empty' "$vm_json")"
  cow_loop="$(jq -r '.meta.cow_loop // empty' "$vm_json")"
  dm_dev="$(jq -r '.meta.dm_dev // empty' "$vm_json")"
  dm_name="$(jq -r '.meta.dm_name // empty' "$vm_json")"
  dns_name="$(jq -r '.meta.dns_name // empty' "$vm_json")"
  if [[ -z "$dns_name" ]]; then
    dns_name="$(banger_dns_name "$vm_name")"
  fi

  if [[ -n "$pid" ]]; then
    sudo kill "$pid" 2>/dev/null || true
  fi
  if [[ -n "$tap" ]]; then
    sudo ip link del "$tap" 2>/dev/null || true
  fi
  if [[ -n "$api_sock" ]]; then
    rm -f "$api_sock"
  fi
  banger_dns_remove_record_name "$dns_name"
  if [[ -n "$dm_dev" || -n "$dm_name" ]]; then
    sudo dmsetup remove "${dm_name:-$dm_dev}" 2>/dev/null || true
  fi
  if [[ -n "$cow_loop" ]]; then
    sudo losetup -d "$cow_loop" 2>/dev/null || true
  fi
  if [[ -n "$base_loop" ]]; then
    sudo losetup -d "$base_loop" 2>/dev/null || true
  fi
  if [[ -d "$vm_dir" ]]; then
    rm -rf "$vm_dir"
  fi

  log "removed ${vm_name:-$vm_dir}"
done