/**
 * 纯 user reducer
 */
import { type UserEvent, type UserState } from "./user-types";

export function userReducer(state: UserState, event: UserEvent): UserState {
  switch (event.type) {
    case "_SetLoading":
      return { ...state, isLoading: event.isLoading };
    case "_SetUser":
      return { ...state, currentUser: event.user };
    case "_SetAvatarUrl":
      return { ...state, avatarUrl: event.url };
    case "_SetPronouns":
      return { ...state, pronouns: event.pronouns };
    case "_SetCoinBalance":
      return { ...state, coinBalance: event.coinBalance };

    case "UserUpdate":
      return { ...state, currentUser: event.user };

    case "UserUpdateUsername": {
      if (!state.currentUser) return state;
      return {
        ...state,
        currentUser: { ...state.currentUser, username: event.username },
      };
    }

    case "UserUpdatePronouns":
      return { ...state, pronouns: event.pronouns };

    case "UserLogout":
      return {
        ...state,
        currentUser: null,
        avatarUrl: null,
      };

    case "UserInit":
    case "UserFetch":
    case "UserDeleteChatHistory":
    case "UserDeleteAccount":
      // 由 side-effects 处理
      return state;

    default:
      return state;
  }
}