import { StorageSerializers, useLocalStorage } from "@vueuse/core";
import { toast } from "vue-sonner";
import type {
  ICommonResponse,
  IUserLoginData,
  IUserLoginRequest,
  IUserLogoutData,
  IUserRegisterData,
  IUserRegisterRequest
} from "#shared/types";
import { UserService } from "~/services";

const USER_INFO_STORAGE_KEY = "newapi_user_info";

export const useUserStore = defineStore("user", () => {
  /** 用户登录状态 */
  const isOnline = ref(false);
  /** 用户信息 */
  const userInfo = useLocalStorage<IUserLoginData | null>(
    USER_INFO_STORAGE_KEY,
    null,
    {
      serializer: StorageSerializers.object
    }
  );
  /** 登录加载状态 */
  const loginLoading = ref(false);
  /** 注册加载状态 */
  const registerLoading = ref(false);
  /** 登出加载状态 */
  const logoutLoading = ref(false);
  /** 刷新当前用户信息加载状态 */
  const getUserInfoLoading = ref(false);

  /** 用户登录 */
  const login = async (
    request: IUserLoginRequest
  ): Promise<ICommonResponse<IUserLoginData> | null> => {
    if (loginLoading.value || isOnline.value || getUserInfoLoading.value)
      return null;

    loginLoading.value = true;

    try {
      const res = await UserService.UserLogin(request);

      if (res.code === 0 && res.data) {
        isOnline.value = true;
        userInfo.value = res.data;
        toast.success(res.msg || "登录成功");
        await readyUserApiKey();
      } else {
        isOnline.value = false;
        userInfo.value = null;
        toast.warning(res.msg || "登录失败");
      }

      return res;
    } catch (err) {
      isOnline.value = false;
      userInfo.value = null;
      toast.error(getErrorMessage(err, "登录失败"));
      return null;
    } finally {
      loginLoading.value = false;
    }
  };

  /** 通过 /api/auth/me 恢复刷新后的登录状态 */
  const getUserInfo =
    async (): Promise<ICommonResponse<IUserLoginData> | null> => {
      if (getUserInfoLoading.value) return null;

      getUserInfoLoading.value = true;

      try {
        const res = await UserService.UserMe();

        if (res.code === 0 && res.data) {
          isOnline.value = true;
          userInfo.value = res.data;
        } else {
          isOnline.value = false;
          userInfo.value = null;
        }

        return res;
      } catch {
        isOnline.value = false;
        userInfo.value = null;
        return null;
      } finally {
        getUserInfoLoading.value = false;
      }
    };

  /** 登录成功后准备后续 AI 调用需要的服务端 API Key，不影响登录状态本身 */
  const readyUserApiKey = async () => {
    try {
      const res = await UserService.UserReady();
      if (res.code !== 0) {
        toast.warning(res.msg || "环境准备失败");
      }
    } catch (err) {
      toast.error(getErrorMessage(err, "环境准备失败"));
    }
  };

  /** 用户注册 */
  const register = async (
    request: IUserRegisterRequest
  ): Promise<ICommonResponse<IUserRegisterData> | null> => {
    if (registerLoading.value || isOnline.value || getUserInfoLoading.value)
      return null;

    registerLoading.value = true;

    try {
      const res = await UserService.UserRegister(request);

      res.code === 0
        ? toast.success(res.msg || "注册成功")
        : toast.warning(res.msg || "注册失败");

      return res;
    } catch (err) {
      toast.error(getErrorMessage(err, "注册失败"));
      return null;
    } finally {
      registerLoading.value = false;
    }
  };

  /** 用户登出 */
  const logout = async (): Promise<ICommonResponse<IUserLogoutData> | null> => {
    if (logoutLoading.value || getUserInfoLoading.value) return null;

    logoutLoading.value = true;

    try {
      const res = await UserService.UserLogout();

      if (res.code === 0) {
        toast.success(res.msg || "登出成功");
      } else {
        toast.warning(res.msg || "登出失败");
      }

      isOnline.value = false;
      userInfo.value = null;

      return res;
    } catch (err) {
      isOnline.value = false;
      userInfo.value = null;
      toast.error(getErrorMessage(err, "登出失败"));
      return null;
    } finally {
      logoutLoading.value = false;
    }
  };

  return {
    isOnline,
    userInfo,
    loginLoading,
    registerLoading,
    logoutLoading,
    getUserInfoLoading,
    login,
    getUserInfo,
    register,
    logout
  };
});