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import React, { useState, useEffect } from 'react';
import { Paper, Typography } from '@material-ui/core';
import { makeStyles } from '@material-ui/core/styles';
const useStyles = makeStyles(theme => ({
root: {
textAlign: 'center',
padding: theme.spacing(5),
background: theme.palette.background.elevation3,
marginTop: theme.spacing(10),
},
}));
interface PropTypes {
registerResult: (result: string) => void;
}
type Mode = 'idle' | 'countdown' | 'running' | 'over';
const TimerButton: React.FC<PropTypes> = ({ registerResult }) => {
const classes = useStyles();
const SPACE = 32;
const maxCountdown = 15000;
const [time, setTime] = useState<string>('00:00:00');
const [mode, setMode] = useState<Mode>('idle');
useEffect(()=> {
const timestamp = Date.now();
if (mode === 'countdown') {
const repeater = setInterval(() => {
const timeDelta = maxCountdown - (Date.now() - timestamp);
if (timeDelta <= 0) setMode('over');
setTime(convertTimeToString(timeDelta));
}, 10);
return (): void => clearInterval(repeater);
}
if (mode === 'running') {
const repeater = setInterval(() => {
setTime(convertTimeToString(Date.now() - timestamp));
}, 10);
return (): void => clearInterval(repeater);
}
if (mode === 'over') {
setTime('00:00:00');
}
}, [mode]);
const handleKeyPress = (event: KeyboardEvent): void => {
event.preventDefault();
if (event.keyCode === SPACE && mode === 'idle' ) setMode('countdown');
};
const handleKeyUp = (event: KeyboardEvent): void => {
if (event.keyCode === SPACE) {
if (mode === 'running') {
registerResult(time);
setMode('idle');
} else if (mode === 'over') {
setMode('idle');
} else {
setMode('running');
}
}
};
useEffect(() => {
window.addEventListener('keyup', handleKeyUp);
window.addEventListener('keypress', handleKeyPress);
return (): void => {
window.removeEventListener('keyup', handleKeyUp);
window.removeEventListener('keypress', handleKeyPress);
};
});
const composeHelperText = (): string => {
switch (mode) {
case 'running': return 'Go fast!';
case 'countdown': return 'Release SPACE to begin';
case 'over': return 'You are too late!';
default: return 'Hold SPACE to start countdown';
}
};
const helperColor = (): 'primary' | 'secondary' | 'textSecondary' => {
switch (mode) {
case 'running': return 'primary';
case 'over': return 'secondary';
default: return 'textSecondary';
}
};
return (
<Paper className={classes.root}>
<Typography variant="h1"> {time} </Typography>
<Typography variant="h5" color={helperColor()}>
{composeHelperText()}
</Typography>
</Paper>
);
};
const convertTimeToString = (timeDelta: number): string => {
let resultTime = '';
const minute = Math.floor(timeDelta / 60000);
if (minute < 10) resultTime += '0';
resultTime += minute + ':';
let second = Math.floor(timeDelta / 1000);
if (second > 59) second %= 60;
if (second < 10) resultTime += '0';
resultTime += second + ':';
const mill = Math.floor((timeDelta % 1000) / 10);
if (mill < 10) resultTime += '0';
resultTime += mill;
return resultTime;
};
export default TimerButton;
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