import { HASHLINE_DICT } from "./constants";

const RE_SIGNIFICANT = /[\p{L}\p{N}]/u;

function computeNormalizedLineHash(lineNumber: number, normalizedContent: string): string {
  const stripped = normalizedContent;
  const seed = RE_SIGNIFICANT.test(stripped) ? 0 : lineNumber;
  const hash = Bun.hash.xxHash32(stripped, seed);
  const index = hash % 256;
  return HASHLINE_DICT[index];
}

export function computeLineHash(lineNumber: number, content: string): string {
  return computeNormalizedLineHash(lineNumber, content.replace(/\r/g, "").trimEnd());
}

export function formatHashLine(lineNumber: number, content: string): string {
  const hash = computeLineHash(lineNumber, content);
  return `${lineNumber}#${hash}|${content}`;
}