import type { UiMessage } from "@/data/dto/chat";

export interface ChatState {
  messages: UiMessage[];
  isReplyingAI: boolean;
  pendingReplyCount: number;
  upgradePromptVisible: boolean;
  upgradeReason: "daily_limit" | "image" | null;
  upgradeHint: string | null;
  upgradeDetail:
    | {
        type?: string;
        usedToday?: number;
        usedTotal?: number;
        limit?: number;
      }
    | null;
  isLoadingMore: boolean;
  hasMore: boolean;
  historyOffset: number;
  /** history 加载完成标志（initial load —— local → network → save 跑完）
   * - guestSession.initializing / user sessions initializing 走 always barrier
   * - 不被 `loadMoreHistoryActor` 设置（翻页是另一码事）
   */
  historyLoaded: boolean;
}

export const initialState: ChatState = {
  messages: [],
  isReplyingAI: false,
  pendingReplyCount: 0,
  upgradePromptVisible: false,
  upgradeReason: null,
  upgradeHint: null,
  upgradeDetail: null,
  isLoadingMore: false,
  hasMore: true,
  historyOffset: 0,
  historyLoaded: false,
};