import Xxhash from './NativeXxhash';

declare global {
  var __xxhash128: (input: string) => string;
  var __xxhash64: (input: string) => string;
}

// Importing the spec above runs TurboModuleRegistry.getEnforcing('xxhash'), which
// instantiates the module synchronously on the JS thread. As a real codegen
// TurboModule it is created during runtime setup, so the native
// installJSIBindingsWithRuntime hook fires and installs __xxhash128/__xxhash64
// before the first hash. The Xxhash.hash128/hash64 spec methods are the reliable
// synchronous fallback if the JSI globals still aren't present.

/**
 * Hashes the input string using the xxhash128 algorithm.
 *
 * @param {string} input - The string to hash.
 * @returns {string} The 128-bit hash as a hex string.
 * @throws {Error} If the input is missing or not a string.
 */
export const hash128 = (input: string): string => {
  if (!input) {
    throw new Error('Input is required');
  }
  if (typeof input !== 'string') {
    throw new Error('Input must be a string');
  }
  if (typeof globalThis.__xxhash128 === 'function') {
    return globalThis.__xxhash128(input);
  }
  return Xxhash.hash128(input);
};

/**
 * Hashes the input string using the xxhash64 algorithm.
 *
 * @param {string} input - The string to hash.
 * @returns {string} The 64-bit hash as a hex string.
 * @throws {Error} If the input is missing or not a string.
 */
export const hash64 = (input: string): string => {
  if (!input) {
    throw new Error('Input is required');
  }
  if (typeof input !== 'string') {
    throw new Error('Input must be a string');
  }
  if (typeof globalThis.__xxhash64 === 'function') {
    return globalThis.__xxhash64(input);
  }
  return Xxhash.hash64(input);
};