# table.ludic - the vehicles, rows of a ludic.base Table: kind and owner as columns, each player's
# own by index, and a nid to its handle. Where one is stays on its record: a boat moves every frame
# and there are never more than two a player to search.
export const VE_KIND: int = 0       # int columns
export const VE_OWNER: int = 1

export property VehicleTable {
  tab: Table<Vehicle> = null
  owners: IntIndex = null           # every vehicle by the player it belongs to
  nids: IntMap = null
}

function ve__new() -> VehicleTable {
  let w = new VehicleTable
  let tb: Table<Vehicle> = table_new(0, 2)
  w.tab = tb
  w.owners = tb_index(tb, VE_OWNER, -1)
  w.nids = imap_new()
  return w
}

# a new row for v, its kind and owner from its record
function ve_file(w: VehicleTable, v: Vehicle) -> void {
  v.tab = w.tab
  v.ent = tb_add(w.tab, v)
  let r = tb_row(w.tab, v.ent)
  w.tab.i[VE_KIND][r] = v.kind
  w.tab.i[VE_OWNER][r] = v.owner
  tb_refile(w.tab, r)
  imap_put(w.nids, v.nid, v.ent)
}

function ve_unfile(w: VehicleTable, v: Vehicle) -> void {
  imap_del(w.nids, v.nid)
  tb_remove(w.tab, v.ent)
  v.ent = -1
}

# the vehicle a message names, or null
export function vehicle_by_nid(vehicles_st: VehiclesState, nid: int) -> Vehicle {
  let tb = vehicles_st.ve.tab
  let r = tb_row(tb, imap_get(vehicles_st.ve.nids, nid, -1))
  if r < 0 or tb.rec[r].nid != nid { return null }
  return tb.rec[r]
}