import { useState, useEffect } from 'react'
import { useNavigate } from 'react-router-dom'
import { Form, Input, Button, Card, Tabs, Checkbox } from 'antd'
import { UserOutlined, LockOutlined, MailOutlined } from '@ant-design/icons'
import { login, register } from '@/api/auth'
import { getUserMenus } from '@/api/menu'
import useUserStore from '@/stores/userStore'
import Toast from '@/components/Toast/Toast'
import './Login.css'

function Login() {
  const [loading, setLoading] = useState(false)
  const [activeTab, setActiveTab] = useState('login')
  const [rememberMe, setRememberMe] = useState(false)
  const [loginForm] = Form.useForm()
  const navigate = useNavigate()
  const { setUser, setToken } = useUserStore()

  // 组件加载时检查是否有保存的用户名
  useEffect(() => {
    const savedUsername = localStorage.getItem('remembered_username')
    if (savedUsername) {
      loginForm.setFieldsValue({ username: savedUsername })
      setRememberMe(true)
    }
  }, [])

  const handleLogin = async (values) => {
    setLoading(true)
    try {
      const res = await login(values)
      Toast.success('登录成功')

      // 处理"记住用户"
      if (rememberMe) {
        localStorage.setItem('remembered_username', values.username)
      } else {
        localStorage.removeItem('remembered_username')
      }

      // 保存 token 和用户信息
      localStorage.setItem('access_token', res.data.access_token)
      localStorage.setItem('user_info', JSON.stringify(res.data.user))
      setToken(res.data.access_token)
      setUser(res.data.user)

      // 获取用户菜单并跳转到第一个菜单
      try {
        const menuRes = await getUserMenus()
        if (menuRes.data && menuRes.data.length > 0) {
          const firstMenu = menuRes.data[0]
          // 如果第一个菜单有子菜单，跳转到第一个子菜单
          if (firstMenu.children && firstMenu.children.length > 0) {
            navigate(firstMenu.children[0].path)
          } else if (firstMenu.path) {
            navigate(firstMenu.path)
          } else {
            // 如果都没有路径，默认跳转到项目列表
            navigate('/projects')
          }
        } else {
          // 如果没有菜单，默认跳转到项目列表
          navigate('/projects')
        }
      } catch (menuError) {
        console.error('Load menus error:', menuError)
        // 如果加载菜单失败，默认跳转到项目列表
        navigate('/projects')
      }
    } catch (error) {
      console.error('Login error:', error)
      const errorMsg = error.response?.data?.detail || error.message || '登录失败，请检查用户名和密码'
      Toast.error('登录失败', errorMsg)
    } finally {
      setLoading(false)
    }
  }

  const handleRegister = async (values) => {
    setLoading(true)
    try {
      await register(values)
      Toast.success('注册成功', '请使用您的账号登录')
      setActiveTab('login')
    } catch (error) {
      console.error('Register error:', error)
      const errorMsg = error.response?.data?.detail || error.message || '注册失败'
      Toast.error('注册失败', errorMsg)
    } finally {
      setLoading(false)
    }
  }

  return (
    <div className="login-container">
      <Card className="login-card">
        <div className="login-header">
          <h1>NEX Docus</h1>
          <p>团队协作文档管理平台</p>
        </div>

        <Tabs activeKey={activeTab} onChange={setActiveTab} centered>
          <Tabs.TabPane tab="登录" key="login">
            <Form
              form={loginForm}
              name="login"
              onFinish={handleLogin}
              autoComplete="off"
              size="large"
            >
              <Form.Item
                name="username"
                rules={[{ required: true, message: '请输入用户名' }]}
              >
                <Input
                  prefix={<UserOutlined />}
                  placeholder="用户名"
                />
              </Form.Item>

              <Form.Item
                name="password"
                rules={[{ required: true, message: '请输入密码' }]}
              >
                <Input.Password
                  prefix={<LockOutlined />}
                  placeholder="密码"
                />
              </Form.Item>

              <Form.Item>
                <Checkbox
                  checked={rememberMe}
                  onChange={(e) => setRememberMe(e.target.checked)}
                >
                  记住用户
                </Checkbox>
              </Form.Item>

              <Form.Item>
                <Button
                  type="primary"
                  htmlType="submit"
                  loading={loading}
                  block
                >
                  登录
                </Button>
              </Form.Item>
            </Form>
          </Tabs.TabPane>

          <Tabs.TabPane tab="注册" key="register">
            <Form
              name="register"
              onFinish={handleRegister}
              autoComplete="off"
              size="large"
            >
              <Form.Item
                name="username"
                rules={[
                  { required: true, message: '请输入用户名' },
                  { min: 3, message: '用户名至少3个字符' },
                ]}
              >
                <Input
                  prefix={<UserOutlined />}
                  placeholder="用户名"
                />
              </Form.Item>

              <Form.Item
                name="email"
                rules={[
                  { type: 'email', message: '请输入有效的邮箱地址' },
                ]}
              >
                <Input
                  prefix={<MailOutlined />}
                  placeholder="邮箱（选填）"
                />
              </Form.Item>

              <Form.Item
                name="password"
                rules={[
                  { required: true, message: '请输入密码' },
                  { min: 6, message: '密码至少6个字符' },
                ]}
              >
                <Input.Password
                  prefix={<LockOutlined />}
                  placeholder="密码"
                />
              </Form.Item>

              <Form.Item
                name="confirm"
                dependencies={['password']}
                rules={[
                  { required: true, message: '请确认密码' },
                  ({ getFieldValue }) => ({
                    validator(_, value) {
                      if (!value || getFieldValue('password') === value) {
                        return Promise.resolve()
                      }
                      return Promise.reject(new Error('两次输入的密码不一致'))
                    },
                  }),
                ]}
              >
                <Input.Password
                  prefix={<LockOutlined />}
                  placeholder="确认密码"
                />
              </Form.Item>

              <Form.Item>
                <Button
                  type="primary"
                  htmlType="submit"
                  loading={loading}
                  block
                >
                  注册
                </Button>
              </Form.Item>
            </Form>
          </Tabs.TabPane>
        </Tabs>
      </Card>

      <div className="login-footer">
        <p>重置密码请联系管理员</p>
      </div>
    </div>
  )
}

export default Login