import React from 'react';
import clsx from 'clsx';
import { createStyles, makeStyles, useTheme, Theme } from '@material-ui/core/styles';
import Input from '@material-ui/core/Input';
import InputLabel from '@material-ui/core/InputLabel';
import MenuItem from '@material-ui/core/MenuItem';
import FormControl from '@material-ui/core/FormControl';
import ListItemText from '@material-ui/core/ListItemText';
import Select from '@material-ui/core/Select';
import Checkbox from '@material-ui/core/Checkbox';
import Chip from '@material-ui/core/Chip';

const useStyles = makeStyles((theme: Theme) =>
  createStyles({
    formControl: {
      margin: theme.spacing(1),
      minWidth: 120,
      maxWidth: 300,
    },
    chips: {
      display: 'flex',
      flexWrap: 'wrap',
    },
    chip: {
      margin: 2,
    },
    noLabel: {
      marginTop: theme.spacing(3),
    },
  }),
);

const ITEM_HEIGHT = 48;
const ITEM_PADDING_TOP = 8;
const MenuProps = {
  PaperProps: {
    style: {
      maxHeight: ITEM_HEIGHT * 4.5 + ITEM_PADDING_TOP,
      width: 250,
    },
  },
};

const names = [
  'Oliver Hansen',
  'Van Henry',
  'April Tucker',
  'Ralph Hubbard',
  'Omar Alexander',
  'Carlos Abbott',
  'Miriam Wagner',
  'Bradley Wilkerson',
  'Virginia Andrews',
  'Kelly Snyder',
];

function getStyles(name: string, personName: string[], theme: Theme) {
  return {
    fontWeight:
      personName.indexOf(name) === -1
        ? theme.typography.fontWeightRegular
        : theme.typography.fontWeightMedium,
  };
}

export default function MultipleSelect() {
  const classes = useStyles();
  const theme = useTheme();
  const [personName, setPersonName] = React.useState<string[]>([]);

  const handleChange = (event: React.ChangeEvent<{ value: unknown }>) => {
    setPersonName(event.target.value as string[]);
  };

  const handleChangeMultiple = (event: React.ChangeEvent<{ value: unknown }>) => {
    const { options } = event.target as HTMLSelectElement;
    const value: string[] = [];
    for (let i = 0, l = options.length; i < l; i += 1) {
      if (options[i].selected) {
        value.push(options[i].value);
      }
    }
    setPersonName(value);
  };

  return (
    <div>
      <FormControl className={classes.formControl}>
        <InputLabel id="demo-mutiple-name-label">Name</InputLabel>
        <Select
          labelId="demo-mutiple-name-label"
          id="demo-mutiple-name"
          multiple
          value={personName}
          onChange={handleChange}
          input={<Input />}
          MenuProps={MenuProps}
        >
          {names.map((name) => (
            <MenuItem key={name} value={name} style={getStyles(name, personName, theme)}>
              {name}
            </MenuItem>
          ))}
        </Select>
      </FormControl>
      <FormControl className={classes.formControl}>
        <InputLabel id="demo-mutiple-checkbox-label">Tag</InputLabel>
        <Select
          labelId="demo-mutiple-checkbox-label"
          id="demo-mutiple-checkbox"
          multiple
          value={personName}
          onChange={handleChange}
          input={<Input />}
          renderValue={(selected) => (selected as string[]).join(', ')}
          MenuProps={MenuProps}
        >
          {names.map((name) => (
            <MenuItem key={name} value={name}>
              <Checkbox checked={personName.indexOf(name) > -1} />
              <ListItemText primary={name} />
            </MenuItem>
          ))}
        </Select>
      </FormControl>
      <FormControl className={classes.formControl}>
        <InputLabel id="demo-mutiple-chip-label">Chip</InputLabel>
        <Select
          labelId="demo-mutiple-chip-label"
          id="demo-mutiple-chip"
          multiple
          value={personName}
          onChange={handleChange}
          input={<Input id="select-multiple-chip" />}
          renderValue={(selected) => (
            <div className={classes.chips}>
              {(selected as string[]).map((value) => (
                <Chip key={value} label={value} className={classes.chip} />
              ))}
            </div>
          )}
          MenuProps={MenuProps}
        >
          {names.map((name) => (
            <MenuItem key={name} value={name} style={getStyles(name, personName, theme)}>
              {name}
            </MenuItem>
          ))}
        </Select>
      </FormControl>
      <FormControl className={clsx(classes.formControl, classes.noLabel)}>
        <Select
          multiple
          displayEmpty
          value={personName}
          onChange={handleChange}
          input={<Input />}
          renderValue={(selected) => {
            if ((selected as string[]).length === 0) {
              return <em>Placeholder</em>;
            }

            return (selected as string[]).join(', ');
          }}
          MenuProps={MenuProps}
          inputProps={{ 'aria-label': 'Without label' }}
        >
          <MenuItem disabled value="">
            <em>Placeholder</em>
          </MenuItem>
          {names.map((name) => (
            <MenuItem key={name} value={name} style={getStyles(name, personName, theme)}>
              {name}
            </MenuItem>
          ))}
        </Select>
      </FormControl>
      <FormControl className={classes.formControl}>
        <InputLabel shrink htmlFor="select-multiple-native">
          Native
        </InputLabel>
        <Select
          multiple
          native
          value={personName}
          onChange={handleChangeMultiple}
          inputProps={{
            id: 'select-multiple-native',
          }}
        >
          {names.map((name) => (
            <option key={name} value={name}>
              {name}
            </option>
          ))}
        </Select>
      </FormControl>
    </div>
  );
}