/**
 * 用户认证状态管理 Store
 * 管理 token、用户信息、VIP 状态，持久化到 localStorage
 */

import { create } from 'zustand';
import { api } from '@/lib/api';

export interface AuthState {
  // 状态
  token: string | null;
  userId: number | null;
  username: string | null;
  isVip: boolean;
  vipExpireAt: string | null;
  dailyUsed: number;
  dailyRemaining: number | null;  // null = VIP 无限制
  dailyLimit: number | null;
  isLoading: boolean;
  isInitialized: boolean;

  // Actions
  login: (username: string, password: string) => Promise<void>;
  register: (username: string, password: string) => Promise<void>;
  logout: () => Promise<void>;
  fetchUserInfo: () => Promise<void>;
  fetchUsage: () => Promise<void>;
  initialize: () => Promise<void>;
}

const TOKEN_KEY = 'auth_token';

export const useAuthStore = create<AuthState>((set, get) => ({
  token: null,
  userId: null,
  username: null,
  isVip: false,
  vipExpireAt: null,
  dailyUsed: 0,
  dailyRemaining: null,
  dailyLimit: null,
  isLoading: false,
  isInitialized: false,

  initialize: async () => {
    if (typeof window === 'undefined') {
      set({ isInitialized: true });
      return;
    }

    const savedToken = localStorage.getItem(TOKEN_KEY);
    if (!savedToken) {
      set({ isInitialized: true });
      return;
    }

    set({ token: savedToken, isLoading: true });

    try {
      const userInfo = await api.me(savedToken);
      set({
        userId: userInfo.user_id,
        username: userInfo.username,
        isVip: userInfo.is_vip,
        vipExpireAt: userInfo.vip_expire_at,
        isInitialized: true,
        isLoading: false,
      });
      // 同时获取今日使用量
      try {
        const usage = await api.getUsageToday(savedToken);
        set({ dailyUsed: usage.used, dailyRemaining: usage.remaining, dailyLimit: usage.limit });
      } catch { /* 静默失败 */ }
    } catch {
      // Token 过期或无效，清除
      localStorage.removeItem(TOKEN_KEY);
      set({
        token: null,
        userId: null,
        username: null,
        isVip: false,
        vipExpireAt: null,
        isInitialized: true,
        isLoading: false,
      });
    }
  },

  login: async (username: string, password: string) => {
    set({ isLoading: true });
    try {
      const res = await api.login(username, password);
      localStorage.setItem(TOKEN_KEY, res.token);
      set({
        token: res.token,
        userId: res.user_id,
        username: res.username,
        isLoading: false,
      });
      // Fetch VIP info and usage
      try {
        const vipInfo = await api.vipStatus(res.token);
        set({ isVip: vipInfo.is_vip, vipExpireAt: vipInfo.vip_expire_at });
        const usage = await api.getUsageToday(res.token);
        set({ dailyUsed: usage.used, dailyRemaining: usage.remaining, dailyLimit: usage.limit });
      } catch {
        // VIP/usage 查询失败不影响登录
      }
    } catch (error) {
      set({ isLoading: false });
      throw error;
    }
  },

  register: async (username: string, password: string) => {
    set({ isLoading: true });
    try {
      const res = await api.register(username, password);
      localStorage.setItem(TOKEN_KEY, res.token);
      set({
        token: res.token,
        userId: res.user_id,
        username: res.username,
        isVip: false,
        vipExpireAt: null,
        isLoading: false,
      });
    } catch (error) {
      set({ isLoading: false });
      throw error;
    }
  },

  logout: async () => {
    const { token } = get();
    if (token) {
      try {
        await api.logout(token);
      } catch {
        // 忽略登出接口错误
      }
    }
    localStorage.removeItem(TOKEN_KEY);
    set({
      token: null,
      userId: null,
      username: null,
      isVip: false,
      vipExpireAt: null,
      dailyUsed: 0,
      dailyRemaining: null,
      dailyLimit: null,
    });
  },

  fetchUsage: async () => {
    const { token } = get();
    if (!token) return;
    try {
      const usage = await api.getUsageToday(token);
      set({ dailyUsed: usage.used, dailyRemaining: usage.remaining, dailyLimit: usage.limit });
    } catch { /* 静默失败 */ }
  },

  fetchUserInfo: async () => {
    const { token } = get();
    if (!token) return;

    try {
      const userInfo = await api.me(token);
      set({
        userId: userInfo.user_id,
        username: userInfo.username,
        isVip: userInfo.is_vip,
        vipExpireAt: userInfo.vip_expire_at,
      });
    } catch {
      // 静默失败
    }
  },
}));