import { sha256 } from '@noble/hashes/sha2';
import { bytesToHex } from '@noble/hashes/utils';

/**
 * Compute a SHA-256 content hash for snapshot comparison.
 */
export function contentHash(content: string | Uint8Array): string {
  const bytes =
    typeof content === 'string' ? new TextEncoder().encode(content) : content;
  return `sha256:${bytesToHex(sha256(bytes))}`;
}

/**
 * Deep equality for file content (string vs Uint8Array).
 */
export function isContentEqual(
  a: string | Uint8Array,
  b: string | Uint8Array,
): boolean {
  if (typeof a === 'string' && typeof b === 'string') {
    return a === b;
  }
  if (a instanceof Uint8Array && b instanceof Uint8Array) {
    if (a.length !== b.length) return false;
    for (let i = 0; i < a.length; i++) {
      if (a[i] !== b[i]) return false;
    }
    return true;
  }
  return false;
}