# system.ludic - the pack as a system: reset and its own save section, each count under its
# kind's name, so kinds can be added or reordered without a migration
export function inv_reset(inventory_st: mut InventoryState) -> void {
  inv_clear(inventory_st)
  q_clear(inv_changes(inventory_st))
}

export function inv_save(inventory_st: InventoryState) -> Val {
  let counts = Value.object()
  for i in 0 .. inv_kinds(inventory_st) {
    if inventory_st.iv_counts[i] != 0 { sv_put_int(counts, inventory_st.iv_keys[i], inventory_st.iv_counts[i]) }
  }
  let v = Value.object()
  Value.put(v, "counts", counts)
  return v
}

# a name this build does not know is dropped
export function inv_load(inventory_st: mut InventoryState, v: Val, version: int) -> void {
  inv_clear(inventory_st)
  if Value.has(v, "counts") == 0 { return }
  let counts = Value.get(v, "counts")
  for i in 0 .. inv_kinds(inventory_st) { inventory_st.iv_counts[i] = Math.max(sv_int(counts, inventory_st.iv_keys[i], 0), 0) }
}

export function inv_system() -> System {
  let s = system_new("inventory", PH_COMMIT)
  s.reset = fn inv_reset
  s.save = fn inv_save
  s.load = fn inv_load
  return s
}