"use strict";

(function (global) {
  const STORAGE_PREFIX = "tarinai_japanese_hash_slot_v1_";
  const META_PREFIX = "tarinai_japanese_hash_slot_meta_v1_";
  const SLOT_COUNT = 9;
  function slotKey(slot) { return `${STORAGE_PREFIX}${slot}`; }
  function metaKey(slot) { return `${META_PREFIX}${slot}`; }
  function writeSlot(slot, hashText, meta = null) {
    const hash = String(hashText || "").trim();
    if (!hash.startsWith("たり")) throw new Error("unsupported Japanese hash slot value");
    global.localStorage?.setItem(slotKey(slot), hash);
    if (meta) global.localStorage?.setItem(metaKey(slot), JSON.stringify({ ...meta, savedAt: Date.now() }));
    return { hash, meta: readMeta(slot) };
  }
  function readMeta(slot) {
    const raw = global.localStorage?.getItem(metaKey(slot));
    if (!raw) return null;
    try { return JSON.parse(raw); } catch (_) { return null; }
  }
  function readSlot(slot) {
    const hash = global.localStorage?.getItem(slotKey(slot));
    if (!hash) return null;
    return { hash, m: readMeta(slot) };
  }
  function requireSlot(slot) {
    const entry = readSlot(slot);
    if (!entry?.hash) throw new Error("empty slot");
    return entry.hash;
  }
  function deleteSlot(slot) {
    global.localStorage?.removeItem(slotKey(slot));
    global.localStorage?.removeItem(metaKey(slot));
  }
  global.TarinaiSaveStorage = { STORAGE_PREFIX, SLOT_COUNT, slotKey, writeSlot, readSlot, requireSlot, deleteSlot };
})(typeof window !== "undefined" ? window : globalThis);