/**
 * Hashline constants ported from Oh-My-OpenAgent.
 *
 * The hashline format is: `{line_number}#{hash_id}|{content}`
 * where hash_id is a 2-character code from the HASHLINE_DICT.
 */

export const NIBBLE_STR = "ZPMQVRWSNKTXJBYH";

/** Maps byte values (0-255) to 2-character hash IDs. */
export const HASHLINE_DICT: string[] = Array.from({ length: 256 }, (_, i) => {
  const high = i >>> 4;
  const low = i & 0x0f;
  return `${NIBBLE_STR[high]}${NIBBLE_STR[low]}`;
});

/** Matches a line reference like `12#AB`. */
export const HASHLINE_REF_PATTERN = /^([0-9]+)#([ZPMQVRWSNKTXJBYH]{2})$/;

/** Matches a full hashline output like `12#AB|content`. */
export const HASHLINE_OUTPUT_PATTERN =
  /^([0-9]+)#([ZPMQVRWSNKTXJBYH]{2})\|(.*)$/;