text: import React, { useEffect, useState } from 'react';
  
  import classes from './Auth.css';
  
  import Input from "../../components/UI/Input/Input";
  import SuccessButton from "../../components/UI/Button/SuccessButton";
  import {connect} from "react-redux";
  import {auth, setAuthRedirect} from '../../store/actions'
  import DangerButton from "../../components/UI/Button/DangerButton";
  import Spinner from "../../components/UI/Spinner/Spinner";
  import {Redirect} from "react-router-dom";
  import checkValidity from "../../util/checkValidity";
  
  const defaultControls = {
    email: {
      elementType: 'input',
      elementConfig: {
        type: 'email',
        placeholder: 'Your Email'
      },
      validation: {
        required: true,
      },
      valid: false,
      value: '',
    },
    password: {
      elementType: 'input',
      elementConfig: {
        type: 'password',
        placeholder: 'Your Password'
      },
      validation: {
        required: true,
        minLength: 7,
      },
      valid: false,
      value: '',
    },
  };
  
  const Auth = (props) => {
    const [formIsValid, setFormValidity] = useState(false);
    const [isSignUp, setSignUp] = useState(false);
    const [controls, setControls] = useState(defaultControls);
  
    useEffect(() => {
      if (props.building && props.authRedirectPath !== '/') {
        props.onSetAuthRedirect();
      }
    });
  
    const submitHandler = (event) => {
      event.preventDefault();
      props.onAuth(
        controls.email.value,
        controls.password.value,
        isSignUp,
      );
    };
  
    const inputChangedHandler = (event, inputIdentifier) => {
      const updatedOrderForm = {
        ...controls
      };
      const updatedFromElement = {
        ...updatedOrderForm[inputIdentifier]
      };
  
      updatedFromElement.value = event.target.value;
      updatedFromElement.valid = checkValidity(event.target.value, updatedFromElement.validation);
      updatedOrderForm[inputIdentifier] = updatedFromElement;
  
      let formIsValidCheck = true;
      for (let input in updatedOrderForm) {
        formIsValidCheck = updatedOrderForm[input].valid && formIsValidCheck;
      }
      setControls(updatedOrderForm);
      setFormValidity(formIsValidCheck);
    };
  
    const switchAuthModeHandler = () =>{
      setSignUp(!isSignUp);
    };
  
    const formElementsArray = [];
    for (let key in controls) {
      formElementsArray.push({
        id: key,
        config: controls[key],
      });
    }
    const form = props.loading ? <Spinner/>: formElementsArray.map((elem) => (
      <Input
        changed={(event) => inputChangedHandler(event,elem.id)}
        invalid={!elem.config.valid}
        key={elem.id}
        elementType={elem.config.elementType}
        elementConfig={elem.config.elementConfig}
        value={elem.config.value}
      />
    ));
  
    if (props.isAuthenticated) {
      return (
        <Redirect to={props.authRedirectPath} />
      )
    }
    return (
      <div className={classes.Auth}>
        {props.error ? <p>{props.error.message}</p> : null}
        <form onSubmit={submitHandler}>
          {form}
          <SuccessButton
            disabled={!formIsValid}
          >
            SUBMIT
          </SuccessButton>
        </form>
        <DangerButton
          clicked={switchAuthModeHandler}
        >
          SWITCH TO {isSignUp ? 'SIGN IN': 'SIGN UP'}
        </DangerButton>
      </div>
    )
  };
  
  const mapStateToProps = (state) => {
    return {
      loading: state.auth.loading,
      error: state.auth.error,
      isAuthenticated: state.auth.token !== null,
      building: state.burgerBuilder.building,
      authRedirectPath: state.auth.authRedirectPath
    }
  };
  
  const mapDispatchToProps = (dispatch) => {
    return {
      onAuth: (email, password, isSignUp) => dispatch(auth(email, password, isSignUp)),
      onSetAuthRedirect: () => dispatch(setAuthRedirect('/')),
    };
  };
  
  export default connect(mapStateToProps, mapDispatchToProps)(Auth);
  