// ── Guarded Crate, with NpcSpawn (protocol 14, PLAN_REDESIGNS §14.3.5) ─────
//
// Bazz3l's Guarded Crate drops a locked crate from a cargo plane and rings it
// with NpcSpawn's scientists; whoever kills the last guard has cleared it. Its
// events reach this module as three kinds: `gc.started` (public), `gc.ended`
// (public) and `gc.failed` (staff's, the timeout). The crate cleared is
// *Warden*'s count, from the tally's `guardedWon` (D375). A run's step places
// one (`eventGuardedCrate.js`).
//
// ── Who may read what ──────────────────────────────────────────────────────
//
// As Dangerous Treasures' are (`dangerousTreasures.js`, D376): the event and its
// grid are public; the clearer's name shows only to the operator's presence
// audience, so with presence left at staff a signed-out visitor reads "The
// guarded crate was cleared · M4"; the Steam id, the position and a step's key
// are staff's. Whether a player cleared it at all is public (`won`), since an
// ending with nobody named (NpcSpawn reloaded under it) names nobody either.

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

const KINDS = Object.freeze(['gc.started', 'gc.ended', 'gc.failed'])

const STEAM_ID = /^\d{17}$/

function isKind(kind) {
  return KINDS.includes(kind)
}

/**
 * One `gc.*` frame for one viewer: `{ staff, presence, geometry }`. Passes the
 * envelope, adds `grid`; an ending adds `won`, and `name` for the presence
 * audience. Staff also get `x`, `z`, the step's `key` and the clearer's
 * `steamId`. Any other frame is returned as is.
 */
function shapeFor(frame, { staff = false, presence = false, geometry = null } = {}) {
  if (!frame || !isKind(frame.kind)) return frame

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

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

  if (frame.kind === 'gc.ended') {
    out.won = STEAM_ID.test(String(frame.steamId || ''))
    if (out.won && (presence || staff) && typeof frame.name === 'string' && frame.name) out.name = frame.name
    if (out.won && staff) out.steamId = String(frame.steamId)
  }

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

  return out
}

/**
 * A server's last report about Guarded Crate and its console, from
 * `servers.db.gcReportFor`: `{ guardedCrate, consolePlugins }`, each null where
 * the plugin never said (no state yet, or a plugin before protocol 14).
 * `guardedCrate` is `{ loaded, version, npcSpawn: { loaded, version }, events }`;
 * `npcSpawn` is null where it was not said, and `events` null where the
 * plugin could not read Guarded Crate's data file.
 */
function reportOf(row) {
  const parse = (value) => {
    if (value === null || value === undefined) return null
    if (typeof value !== 'string') return value
    try {
      return JSON.parse(value)
    } catch {
      return null
    }
  }
  const integration = (body) =>
    body && typeof body === 'object' ? { loaded: body.loaded === true, version: typeof body.version === 'string' ? body.version : null } : null

  const gc = row ? parse(row.guardedCrate) : null
  const probe = row ? parse(row.console) : null
  return {
    guardedCrate:
      gc && typeof gc === 'object'
        ? {
            ...integration(gc),
            npcSpawn: integration(gc.npcSpawn),
            events: Array.isArray(gc.events) ? gc.events.filter((e) => typeof e === 'string' && e.trim()) : null,
          }
        : null,
    consolePlugins: probe && typeof probe === 'object' && typeof probe.plugins === 'boolean' ? probe.plugins : null,
  }
}

module.exports = { KINDS, isKind, shapeFor, reportOf }