import type { AppStore } from "./useAppStore";

/**
 * zustand `persist` 中间件的配置（从 `useAppStore.ts` 拆出，AGENTS §10 文件 ≤500 行）。
 *
 * 只持久化「小且可重建」的东西：会话元数据 + 聚焦的会话 id + 角色目录 + 情绪 + 上下文 +
 * 后台思考条目。消息**不持久化**（后端是消息真源，design/16 §1）。v1 的形状（整份聊天 +
 * 单个会话 id）与 v2（一个全局 `currentPersona`）都无法描述「角色属于会话」的现状，
 * 统一丢弃并由接口重新取回。
 */
export const persistOptions = {
  name: "cyrene.app",
  version: 3,
  // v1 persisted the whole chat (`messages` + a single `sessionId`); v2 added
  // one resolved `currentPersona`, which can no longer describe the active role
  // now that the role belongs to a *session*. Both shapes are dropped:
  // `personas` is refilled from `GET /personas` and the role is re-derived from
  // the session list. `moods` is transient by nature (a restart resets a role's
  // mood), so it is not carried across either. A v1 state was never trusted for
  // the session metadata, so those users simply restart on the main session.
  migrate: (persisted: unknown, version: number) => {
    const p = (persisted ?? {}) as Partial<AppStore>;
    const fromV1 = version < 2;
    return {
      activeSessionId: fromV1 ? "" : p.activeSessionId ?? "",
      sessions: fromV1 ? {} : p.sessions ?? {},
      personas: p.personas ?? [],
      moods: {},
      context: p.context ?? {},
      backthink: p.backthink ?? [],
    };
  },
  partialize: (s: AppStore) => ({
    // messages deliberately excluded: the backend is the message truth
    // (design/16 §1), so we never persist the whole chat into localStorage —
    // and neither is `sessionMessages` (the per-session buckets of 裁决 16.4.5).
    // We keep the (small) session metadata + the focused session id so a
    // refresh lands on the same conversation, plus the role catalog so the
    // avatar/name/wallpaper resolve before the first fetch returns.
    activeSessionId: s.activeSessionId,
    sessions: s.sessions,
    personas: s.personas,
    moods: s.moods,
    context: s.context,
    backthink: s.backthink,
  }),
};