// ── Dynamic PVP's zones (protocol 14, PLAN_REDESIGNS §14.3.3) ──────────────
//
// HunterZ's Dynamic PVP opens its own temporary PvP zones around a downed
// patrol helicopter, a Bradley, a locked crate, an airdrop, the cargo ship and
// the rest. They are the plugin's own: there is no step and no trigger here,
// only the feed's lines (`pvp.zone.created`, public; `pvp.zone.deleted`,
// staff's) and the map's `pvp` layer.
//
// ── Who may read what ──────────────────────────────────────────────────────
//
// As a world event is read (`worldEvents.js`, D353): the zone and its grid are
// public, and its position is staff's, because the map has its own audience for
// where things are (D111). A zone names nobody.
//
// **Only Dynamic PVP's own vanilla events carry their name to the public.** Its
// monument zones are named after the monument and an operator's own events by
// whatever the operator typed into its config; those reach staff as written and
// everyone else as "A PvP zone opened at G7".

const { gridOf } = require('./worldEvents')

/** Dynamic PVP 5.2.0's own events (its `GeneralEventType`), as its hooks name them. */
const GENERAL_EVENTS = Object.freeze([
  'Bradley',
  'Helicopter',
  'Satellite',
  'TimedSupply',
  'SupplySignal',
  'CargoShip',
  'HackableCrate',
  'ExcavatorIgnition',
  'GhostShip',
  'DeepSeaIsland',
  'IslandCannon',
])

const KINDS = Object.freeze(['pvp.zone.created', 'pvp.zone.deleted'])

function isGeneral(event) {
  return GENERAL_EVENTS.includes(event)
}

/**
 * One `pvp.zone.*` frame for one viewer: `{ staff, geometry }`. Passes
 * `kind`, `type`, `t`, `serverId`, `wipeId`, `radius`, `shape`, `durationSec`,
 * adds `grid`, and `event` when it is one of Dynamic PVP's own or the viewer is
 * staff. Staff also get `x`, `z` and `zoneId`. Any other frame is returned as is.
 */
function shapeFor(frame, { staff = false, geometry = null } = {}) {
  if (!frame || !KINDS.includes(frame.kind)) return frame

  const out = {}
  for (const key of ['kind', 'type', 't', 'serverId', 'wipeId', 'radius', 'shape', 'durationSec']) {
    if (frame[key] !== undefined) out[key] = frame[key]
  }

  const grid = gridOf(geometry, frame.x, frame.z)
  if (grid) out.grid = grid

  if (typeof frame.event === 'string' && frame.event && (staff || isGeneral(frame.event))) out.event = frame.event

  if (staff) {
    for (const key of ['x', 'z', 'zoneId']) {
      if (frame[key] !== undefined) out[key] = frame[key]
    }
  }

  return out
}

module.exports = { GENERAL_EVENTS, KINDS, isGeneral, shapeFor }