import Taro from '@tarojs/taro'
import { authClient } from '../api'
import { InferResponseType } from 'hono'

// 用户类型定义
export type User = InferResponseType<typeof authClient.me.$get, 200>

// 认证状态管理
class AuthManager {
  private static instance: AuthManager
  
  static getInstance(): AuthManager {
    if (!AuthManager.instance) {
      AuthManager.instance = new AuthManager()
    }
    return AuthManager.instance
  }

  // 获取token
  getToken(): string | null {
    return Taro.getStorageSync('token')
  }

  // 设置token
  setToken(token: string): void {
    Taro.setStorageSync('token', token)
  }

  // 清除token
  removeToken(): void {
    Taro.removeStorageSync('token')
  }

  // 获取用户信息
  getUserInfo(): User | null {
    const userInfo = Taro.getStorageSync('userInfo')
    return userInfo ? JSON.parse(userInfo) : null
  }

  // 设置用户信息
  setUserInfo(user: User): void {
    Taro.setStorageSync('userInfo', JSON.stringify(user))
  }

  // 清除用户信息
  removeUserInfo(): void {
    Taro.removeStorageSync('userInfo')
  }

  // 检查是否已登录
  isLoggedIn(): boolean {
    return !!this.getToken()
  }

  // 登录
  async login(username: string, password: string): Promise<User> {
    try {
      const response = await authClient.login.$post({
        json: { username, password }
      })
      if (response.status !== 200) {
        throw new Error('登录失败')
      }
      const { token, user } = await response.json()
      
      this.setToken(token)
      this.setUserInfo(user)
      
      return user
    } catch (error) {
      throw new Error('登录失败，请检查用户名和密码')
    }
  }

  // 注册
  async register(data: {
    username: string
    password: string
    email?: string
  }): Promise<User> {
    try {
      const response = await authClient.register.$post({
        json: data
      })
      if (response.status !== 201) {
        throw new Error('注册失败')
      }
      const { token, user } = await response.json()
      
      this.setToken(token)
      this.setUserInfo(user)
      
      return user
    } catch (error) {
      throw new Error('注册失败，请重试')
    }
  }

  // 登出
  async logout(): Promise<void> {
    try {
      const response = await authClient.logout.$post({})
      if (response.status !== 200) {
        throw new Error('登出失败')
      }
    } catch (error) {
      console.error('Logout error:', error)
    } finally {
      this.removeToken()
      this.removeUserInfo()
      Taro.redirectTo({ url: '/pages/login/index' })
    }
  }

  // 获取当前用户信息
  async getCurrentUser(): Promise<User | null> {
    if (!this.isLoggedIn()) {
      return null
    }

    try {
      const response = await authClient.me.$get({})
      if (response.status !== 200) {
        throw new Error('获取用户信息失败')
      }
      const user = await response.json()
      this.setUserInfo(user)
      return user
    } catch (error) {
      this.removeToken()
      this.removeUserInfo()
      return null
    }
  }
}

// 导出单例实例
export const authManager = AuthManager.getInstance()