src/frontend/app/components/LineIcon.tsx


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import React, { useMemo } from "react";
import "./LineIcon.css";
import { type RegionId } from "../data/RegionConfig";

interface LineIconProps {
  line: string;
  region?: RegionId;
  rounded?: boolean;
}

const LineIcon: React.FC<LineIconProps> = ({ line, region = "vigo", rounded = false }) => {
  const formattedLine = useMemo(() => {
    return /^[a-zA-Z]/.test(line) ? line : `L${line}`;
  }, [line]);
  const cssVarName = `--line-${region}-${formattedLine.toLowerCase()}`;
  const cssTextVarName = `--line-${region}-${formattedLine.toLowerCase()}-text`;

  return (
    <span
      className={rounded ? 'line-icon-rounded' : 'line-icon'}
      style={{ '--line-colour': `var(${cssVarName})`, '--line-text-colour': `var(${cssTextVarName}, unset)` } as React.CSSProperties}
    >
      {line}
    </span>
  );
};

export default LineIcon;