// Copyright 2017-2021 @polkadot/types authors & contributors
// SPDX-License-Identifier: Apache-2.0

import type { Codec, Constructor, Registry } from '../../types';

/**
 * Given an u8a, and an array of Type constructors, decode the u8a against the
 * types, and return an array of decoded values.
 *
 * @param u8a - The u8a to decode.
 * @param types - The array of Constructor to decode the U8a against.
 */
export function decodeU8a (registry: Registry, u8a: Uint8Array, _types: Constructor[] | { [index: string]: Constructor }): Codec[] {
  const types = Array.isArray(_types)
    ? _types
    : Object.values(_types);
  const result: Codec[] = [];
  let offset = 0;

  for (let i = 0; i < types.length; i++) {
    const value = new types[i](registry, u8a.subarray(offset));

    result.push(value);
    offset += value.encodedLength;
  }

  return result;
}