import React from 'react';
import { makeStyles, Theme, createStyles } from '@material-ui/core/styles';
import FormLabel from '@material-ui/core/FormLabel';
import FormControl from '@material-ui/core/FormControl';
import FormGroup from '@material-ui/core/FormGroup';
import FormControlLabel from '@material-ui/core/FormControlLabel';
import FormHelperText from '@material-ui/core/FormHelperText';
import Checkbox from '@material-ui/core/Checkbox';

const useStyles = makeStyles((theme: Theme) =>
  createStyles({
    root: {
      display: 'flex',
    },
    formControl: {
      margin: theme.spacing(3),
    },
  }),
);

export default function CheckboxesGroup() {
  const classes = useStyles();
  const [state, setState] = React.useState({
    gilad: true,
    jason: false,
    antoine: false,
  });

  const handleChange = (event: React.ChangeEvent<HTMLInputElement>) => {
    setState({ ...state, [event.target.name]: event.target.checked });
  };

  const { gilad, jason, antoine } = state;
  const error = [gilad, jason, antoine].filter((v) => v).length !== 2;

  return (
    <div className={classes.root}>
      <FormControl component="fieldset" className={classes.formControl}>
        <FormLabel component="legend">Assign responsibility</FormLabel>
        <FormGroup>
          <FormControlLabel
            control={<Checkbox checked={gilad} onChange={handleChange} name="gilad" />}
            label="Gilad Gray"
          />
          <FormControlLabel
            control={<Checkbox checked={jason} onChange={handleChange} name="jason" />}
            label="Jason Killian"
          />
          <FormControlLabel
            control={<Checkbox checked={antoine} onChange={handleChange} name="antoine" />}
            label="Antoine Llorca"
          />
        </FormGroup>
        <FormHelperText>Be careful</FormHelperText>
      </FormControl>
      <FormControl required error={error} component="fieldset" className={classes.formControl}>
        <FormLabel component="legend">Pick two</FormLabel>
        <FormGroup>
          <FormControlLabel
            control={<Checkbox checked={gilad} onChange={handleChange} name="gilad" />}
            label="Gilad Gray"
          />
          <FormControlLabel
            control={<Checkbox checked={jason} onChange={handleChange} name="jason" />}
            label="Jason Killian"
          />
          <FormControlLabel
            control={<Checkbox checked={antoine} onChange={handleChange} name="antoine" />}
            label="Antoine Llorca"
          />
        </FormGroup>
        <FormHelperText>You can display an error</FormHelperText>
      </FormControl>
    </div>
  );
}