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import React from 'react';
import { makeStyles } from '@material-ui/core/styles';
import {
getContrastRatio,
darken,
} from '@material-ui/core/styles/colorManipulator';
import { common } from '@material-ui/core/colors';
import { Color } from './gqlTypes';
import { LabelFragment } from './Label.generated';
// Minimum contrast between the background and the text color
const contrastThreshold = 2.5;
// Guess the text color based on the background color
const getTextColor = (background: string) =>
getContrastRatio(background, common.white) >= contrastThreshold
? common.white // White on dark backgrounds
: common.black; // And black on light ones
const _rgb = (color: Color) => 'rgb(' + color.R + ',' + color.G + ',' + color.B + ')';
// Create a style object from the label RGB colors
const createStyle = (color: Color) => ({
backgroundColor: _rgb(color),
color: getTextColor(_rgb(color)),
borderBottomColor: darken(_rgb(color), 0.2),
});
const useStyles = makeStyles(theme => ({
label: {
...theme.typography.body1,
padding: '1px 6px 0.5px',
fontSize: '0.9em',
fontWeight: 500,
margin: '0.05em 1px calc(-1.5px + 0.05em)',
borderRadius: '3px',
display: 'inline-block',
borderBottom: 'solid 1.5px',
verticalAlign: 'bottom',
},
}));
type Props = { label: LabelFragment };
function Label({ label }: Props) {
const classes = useStyles();
return (
<span className={classes.label} style={createStyle(label.color)}>
{label.name}
</span>
);
}
export default Label;
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