import { AbstractHDWallet } from './abstract-hd-wallet';
const bitcoin = require('bitcoinjs-lib');
const bip39 = require('bip39');

/**
 * HD Wallet (BIP39).
 * In particular, Breadwallet-compatible (Legacy addresses)
 */
export class HDLegacyBreadwalletWallet extends AbstractHDWallet {
  constructor() {
    super();
    this.type = 'HDLegacyBreadwallet';
  }

  getTypeReadable() {
    return 'HD Legacy Breadwallet (P2PKH)';
  }

  /**
   * @see https://github.com/bitcoinjs/bitcoinjs-lib/issues/584
   * @see https://github.com/bitcoinjs/bitcoinjs-lib/issues/914
   * @see https://github.com/bitcoinjs/bitcoinjs-lib/issues/997
   */
  getXpub() {
    if (this._xpub) {
      return this._xpub; // cache hit
    }
    let mnemonic = this.secret;
    let seed = bip39.mnemonicToSeed(mnemonic);
    let root = bitcoin.HDNode.fromSeedBuffer(seed);

    let path = "m/0'";
    let child = root.derivePath(path).neutered();
    this._xpub = child.toBase58();
    return this._xpub;
  }

  _getExternalAddressByIndex(index) {
    index = index * 1; // cast to int
    if (this.external_addresses_cache[index]) return this.external_addresses_cache[index]; // cache hit
    let mnemonic = this.secret;
    let seed = bip39.mnemonicToSeed(mnemonic);
    let root = bitcoin.HDNode.fromSeedBuffer(seed);

    let path = "m/0'/0/" + index;
    let child = root.derivePath(path);

    return (this.external_addresses_cache[index] = child.getAddress());
  }

  _getInternalAddressByIndex(index) {
    index = index * 1; // cast to int
    if (this.internal_addresses_cache[index]) return this.internal_addresses_cache[index]; // cache hit
    let mnemonic = this.secret;
    let seed = bip39.mnemonicToSeed(mnemonic);
    let root = bitcoin.HDNode.fromSeedBuffer(seed);

    let path = "m/0'/1/" + index;
    let child = root.derivePath(path);

    return (this.internal_addresses_cache[index] = child.getAddress());
  }

  _getExternalWIFByIndex(index) {
    index = index * 1; // cast to int
    let mnemonic = this.secret;
    let seed = bip39.mnemonicToSeed(mnemonic);
    let root = bitcoin.HDNode.fromSeedBuffer(seed);
    let path = "m/0'/0/" + index;
    let child = root.derivePath(path);
    return child.keyPair.toWIF();
  }

  _getInternalWIFByIndex(index) {
    index = index * 1; // cast to int
    let mnemonic = this.secret;
    let seed = bip39.mnemonicToSeed(mnemonic);
    let root = bitcoin.HDNode.fromSeedBuffer(seed);
    let path = "m/0'/1/" + index;
    let child = root.derivePath(path);
    return child.keyPair.toWIF();
  }
}