text: import React, { useEffect , useState } from 'react';
  import { connect } from 'react-redux';
  import { Redirect } from 'react-router-dom';
  
  import Input from '../../components/UI/Input/Input';
  import Button from '../../components/UI/Button/Button';
  import Spinner from '../../components/UI/Spinner/Spinner';
  import styles from './Auth.module.css';
  import * as actions from '../../store/actions/index';
  import { updateObject, checkValidity } from '../../shared/utility';
  
  const Auth = props => {
      const [authForm , setAuthForm] = useState({
              email: {
                  elementType: 'input',
                  elementConfig: {
                      type: 'email',
                      placeholder: 'Mail Address'
                  },
                  value: '',
                  validation: {
                      required: true,
                      isEmail: true
                  },
                  valid: false,
                  touched: false
              },
              password: {
                  elementType: 'input',
                  elementConfig: {
                      type: 'password',
                      placeholder: 'Password'
                  },
                  value: '',
                  validation: {
                      required: true,
                      minLength: 6
                  },
                  valid: false,
                  touched: false
              }
          });
          const [isSignup ,SetIsSignup] = useState(true)
  
          const { buildingBurger , authRedirectPath , onSetAuthRedirectPath } = props
      
  
      useEffect(()=>{
          if ( !buildingBurger && authRedirectPath !== '/' ) {
              onSetAuthRedirectPath();
          }
      },[buildingBurger , authRedirectPath , onSetAuthRedirectPath ])
  
     const inputChangedHandler = ( event, controlName ) => {
          const updatedControls = updateObject( authForm, {
              [controlName]: updateObject( authForm [controlName], {
                  value: event.target.value,
                  valid: checkValidity( event.target.value, authForm[controlName].validation ),
                  touched: true
              } )
          } );
          setAuthForm(updatedControls);
      }
  
     const  submitHandler = ( event ) => {
          event.preventDefault();
          props.onAuth( authForm.email.value, authForm.password.value, isSignup );
      }
  
     const  switchAuthModeHandler = () => {
          SetIsSignup(!isSignup)
      }
  
     
          const formElementsArray = [];
          for ( let key in authForm ) {
              formElementsArray.push( {
                  id: key,
                  config: authForm[key]
              } );
          }
  
          let form = formElementsArray.map( formElement => (
              <Input
                  key={formElement.id}
                  elementType={formElement.config.elementType}
                  elementConfig={formElement.config.elementConfig}
                  value={formElement.config.value}
                  invalid={!formElement.config.valid}
                  shouldValidate={formElement.config.validation}
                  touched={formElement.config.touched}
                  changed={( event ) => inputChangedHandler( event, formElement.id )} />
          ) );
  
          if ( props.loading ) {
              form = <Spinner />
          }
  
          let errorMessage = null;
  
          if ( props.error ) {
              errorMessage = (
                  <p>{props.error.message}</p>
              );
          }
  
          let authRedirect = null;
          if ( props.isAuthenticated ) {
              authRedirect = <Redirect to={props.authRedirectPath} />
          }
  
          return (
              <div className={styles.Auth}>
                  {authRedirect}
                  {errorMessage}
                  <form onSubmit={submitHandler}>
                      {form}
                      <Button btnType="Success">SUBMIT</Button>
                  </form>
                  <Button
                      clicked={switchAuthModeHandler}
                      btnType="Danger">SWITCH TO {isSignup ? 'SIGNIN' : 'SIGNUP'}</Button>
              </div>
          );
  }
  
  const mapStateToProps = state => {
      return {
          loading: state.auth.loading,
          error: state.auth.error,
          isAuthenticated: state.auth.token !== null,
          buildingBurger: state.burgerBuilder.building,
          authRedirectPath: state.auth.authRedirectPath
      };
  };
  
  const mapDispatchToProps = dispatch => {
      return {
          onAuth: ( email, password, isSignup ) => dispatch( actions.auth( email, password, isSignup ) ),
          onSetAuthRedirectPath: () => dispatch( actions.setAuthRedirectPath( '/' ) )
      };
  };
  
  export default connect( mapStateToProps, mapDispatchToProps )( Auth );