import React from 'react';
import { socket } from '../../App'
import './EnterChat.scss'

const EnterChat = ({ setUser }) => {

  const [authError, setAuthError] = React.useState({ status: false, message: '' })

  const loginHandler = e => {
    e.preventDefault()
    const username = e.target.elements.username.value.trim()[0].toUpperCase() + e.target.elements.username.value.trim().slice(1)
    const maxUsernameLength = 20

    if (username === '') {
      setAuthError({ status: true, message: '*Invalid username!' })
      return
    }

    if (username.match(/\d/)) {
      setAuthError({ status: true, message: '*Numbers are not allowed!' })
      return
    }

    if (username.length >= maxUsernameLength) {
      setAuthError({ status: true, message: `*Max username length: ${maxUsernameLength}` })
      return
    }

    setUser({ username, isLoggedIn: true })
    setAuthError({ status: false, message: '' })
    socket.emit('user:connected', username)
  }

  return (
    <div className="enter">
      <div className="enter-heading">
        <h1>React Chat</h1>
        <p>A simple react chat application</p>
      </div>
      {authError.status ? <div className='enter-error'><span>{authError.message}</span></div> : null}
      <div className="enter-form">
        <form onSubmit={loginHandler}>
          <input required placeholder='Your name' name='username' type="text"/>
          <button type='submit' className='btn-primary'>Join</button>
        </form>
      </div>
      <div className="enter-footer">
        <a href="https://github.com/sergeyyarkov/react-chat-app" target='_blank' rel='noopener noreferrer'>
          <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z"/></svg>
        </a>
      </div>
    </div>
  )
}

export default EnterChat