// Copyright (c) Meta Platforms, Inc. and affiliates.

/**
 * @file computeTargetAndRel.ts
 * @input Link target and rel values
 * @output Exports helper for normalizing target/rel link props
 * @position Internal utility; consumed by link-rendering components
 */

const BLANK_TARGET_REL_TOKENS = ['noopener', 'noreferrer'] as const;
export function computeTargetAndRel(target: string | undefined, rel: string | undefined): {
  rel: string | undefined;
  target: string | undefined;
} {
  if (target !== '_blank') {
    return {
      target,
      rel
    };
  }
  const tokens = rel?.split(/\s+/).filter(Boolean) ?? [];
  for (const token of BLANK_TARGET_REL_TOKENS) {
    if (!tokens.includes(token)) {
      tokens.push(token);
    }
  }
  return {
    target,
    rel: tokens.join(' ')
  };
}