import { freshSave, parseSave as parse, saveVersion } from "../core.ts";
import type { PetState } from "../types.ts";

// Save versions and migrations live in the shared rules (core/src/save.rs). A
// save that cannot be read (corrupt, from a newer version, or a failed
// migration) is never overwritten: it becomes a "bad egg" that the owner can
// download or replace.
export const timeZone = () => Intl.DateTimeFormat().resolvedOptions().timeZone || "UTC";
export const VERSION = () => saveVersion();
export function fresh(): PetState {
  return freshSave(Date.now(), timeZone());
}
/** Throws with `newer` set for a save from a newer version. */
export function parseSave(raw: string): PetState {
  const result = parse(raw, Date.now(), timeZone());
  if ("state" in result) return result.state;
  throw Object.assign(new Error(result.error), { newer: result.newer });
}