#!/usr/bin/env bash

# ============================================
# Help
# ============================================

function cmd::preset::help() {
  cat <<EOF
Usage: wgctl preset <subcommand> [options]

Manage firewall presets.

Subcommands:
  list, ls                    List available presets
  add,  new, create           Add a new preset
  remove, rm, del             Remove a preset

Options for add:
  --name <name>               Preset name (e.g. no-jellyfin)
  --desc <description>        Human readable description
  --block-ip <ip>             Block specific IP (repeatable)
  --block-subnet <cidr>       Block subnet (repeatable)
  --block-port <ip:port:proto> Block specific port (repeatable)

Examples:
  wgctl preset list
  wgctl preset add --name no-jellyfin --desc "Block Jellyfin" --block-ip 10.0.0.210 --block-port 10.0.0.210:8096:tcp
  wgctl preset remove --name no-jellyfin
EOF
}

# ============================================
# Run
# ============================================

function cmd::preset::run() {
  local subcmd="${1:-help}"
  shift || true

  case "$subcmd" in
    list|ls)                cmd::preset::list "$@"   ;;
    add|new|create)         cmd::preset::add "$@"    ;;
    remove|rm|del|delete)   cmd::preset::remove "$@" ;;
    help)                   cmd::preset::help        ;;
    *)
      log::error "Unknown subcommand: '${subcmd}'"
      cmd::preset::help
      return 1
      ;;
  esac
}

# ============================================
# List
# ============================================

function cmd::preset::list() {
  local dir
  dir="$(ctx::presets)"

  local presets=("${dir}"/*.preset)
  if [[ ! -f "${presets[0]}" ]]; then
    log::wg_preset "No presets configured"
    return 0
  fi

  log::section "Available Presets"

  printf "\n  %-25s %-40s %s\n" "NAME" "DESCRIPTION" "RULES"
  printf "  %s\n" "$(printf '─%.0s' {1..75})"

  for preset_file in "${dir}"/*.preset; do
    [[ -f "$preset_file" ]] || continue

    # Reset vars before sourcing
    local PRESET_NAME="" PRESET_DESC=""
    local BLOCK_IPS="" BLOCK_SUBNETS="" BLOCK_PORTS=""

    source "$preset_file"

    local rules=""
    [[ -n "$BLOCK_IPS" ]]     && rules+="IPs:$(echo "$BLOCK_IPS" | wc -w) "
    [[ -n "$BLOCK_SUBNETS" ]] && rules+="Subnets:$(echo "$BLOCK_SUBNETS" | wc -w) "
    [[ -n "$BLOCK_PORTS" ]]   && rules+="Ports:$(echo "$BLOCK_PORTS" | wc -w)"

    printf "  %-25s %-40s %s\n" \
      "$PRESET_NAME" \
      "${PRESET_DESC:-—}" \
      "${rules:-—}"
  done

  printf "\n"
}

# ============================================
# Add
# ============================================

function cmd::preset::add() {
  local name=""
  local desc=""
  local block_ips=()
  local block_subnets=()
  local block_ports=()

  while [[ $# -gt 0 ]]; do
    case "$1" in
      --name)         name="$2";              shift 2 ;;
      --desc)         desc="$2";              shift 2 ;;
      --block-ip)     block_ips+=("$2");      shift 2 ;;
      --block-subnet) block_subnets+=("$2");  shift 2 ;;
      --block-port)   block_ports+=("$2");    shift 2 ;;
      --help)         cmd::preset::help;      return  ;;
      *)
        log::error "Unknown flag: $1"
        cmd::preset::help
        return 1
        ;;
    esac
  done

  if [[ -z "$name" ]]; then
    log::error "Missing required flag: --name"
    return 1
  fi

  if [[ ${#block_ips[@]} -eq 0 && ${#block_subnets[@]} -eq 0 && ${#block_ports[@]} -eq 0 ]]; then
    log::error "At least one of --block-ip, --block-subnet, or --block-port is required"
    return 1
  fi

  local preset_file
  preset_file="$(ctx::preset::path "${name}.preset")"

  if [[ -f "$preset_file" ]]; then
    log::error "Preset already exists: ${name}"
    return 1
  fi

  cat > "$preset_file" <<EOF
# wgctl preset — ${name}
PRESET_NAME="${name}"
PRESET_DESC="${desc}"
BLOCK_IPS="${block_ips[*]:-}"
BLOCK_SUBNETS="${block_subnets[*]:-}"
BLOCK_PORTS="${block_ports[*]:-}"
EOF

  log::wg_success "Preset created: ${name}"
}

# ============================================
# Remove
# ============================================

function cmd::preset::remove() {
  local name=""
  local force=false

  while [[ $# -gt 0 ]]; do
    case "$1" in
      --name)   name="$2";              shift 2 ;;
      --force)  force=true;             shift   ;;
      --help)   cmd::preset::help;      return  ;;
      *)
        log::error "Unknown flag: $1"
        cmd::preset::help
        return 1
        ;;
    esac
  done

  if [[ -z "$name" ]]; then
    log::error "Missing required flag: --name"
    return 1
  fi

  local preset_file
  preset_file="$(ctx::preset::path "${name}.preset")"

  if [[ ! -f "$preset_file" ]]; then
    log::error "Preset not found: ${name}"
    return 1
  fi

  if ! $force; then
    read -r -p "Are you sure you want to remove preset '${name}'? [y/N] " confirm
    case "$confirm" in
      [yY][eE][sS]|[yY]) ;;
      *)
        log::info "Aborted"
        return 0
        ;;
    esac
  fi

  rm -f "$preset_file"
  log::wg_success "Preset removed: ${name}"
}