/**
 * @packageDocumentation
 * @module harmony-account
 */

import { bip39, hdkey, EncryptOptions, getAddress, generatePrivateKey } from '@harmony-js/crypto';
import { Messenger } from '@harmony-js/network';
import { isPrivateKey, isAddress, ChainType } from '@harmony-js/utils';
import { Transaction } from '@harmony-js/transaction';
import { StakingTransaction } from '@harmony-js/staking';
import { Account } from './account';
import { defaultMessenger } from './utils';

class Wallet {
  // static method generate Mnemonic
  static generateMnemonic(): string {
    return bip39.generateMnemonic();
  }

  /** @hidden */
  messenger: Messenger;
  /** @hidden */
  protected defaultSigner?: string;
  /**
   * @hidden
   */
  private accountMap: Map<string, Account> = new Map();

  /**
   * get acounts addresses
   *
   * @return {string[]} accounts addresses
   *
   * @example
   * ```javascript
   * const wallet = new Wallet(customMessenger);
   * const key_1 = '45e497bd45a9049bcb649016594489ac67b9f052a6cdf5cb74ee2427a60bf25e';
   * wallet.addByPrivateKey(key_1);
   *
   * console.log(wallet.accounts);
   * ```
   */
  get accounts(): string[] {
    return [...this.accountMap.keys()];
  }

  /**
   * get the signer of the account, by default, using the first account
   *
   * @example
   * ```javascript
   * const wallet = new Wallet(customMessenger);
   * const key_1 = '45e497bd45a9049bcb649016594489ac67b9f052a6cdf5cb74ee2427a60bf25e';
   * wallet.addByPrivateKey(key_1);
   *
   * console.log(wallet.signer)
   * ```
   */
  get signer(): Account | undefined {
    if (this.defaultSigner) {
      return this.getAccount(this.defaultSigner);
    } else if (!this.defaultSigner && this.accounts.length > 0) {
      this.setSigner(this.accounts[0]);
      return this.getAccount(this.accounts[0]);
    } else {
      return undefined;
    }
  }

  /**
   * @example
   * ```
   * const { Wallet } = require('@harmony-js/account');
   * const { HttpProvider, Messenger } = require('@harmony-js/network');
   * const { ChainType, ChainID } = require('@harmony-js/utils');
   *
   * // create a custom messenger
   * const customMessenger = new Messenger(
   *   new HttpProvider('http://localhost:9500'),
   *   ChainType.Harmony, // if you are connected to Harmony's blockchain
   *   ChainID.HmyLocal, // check if the chainId is correct
   * )
   *
   * const wallet = new Wallet(customMessenger);
   * ```
   */
  constructor(messenger: Messenger = defaultMessenger) {
    this.messenger = messenger;
  }
  /**
   * @function newMnemonic
   * @memberof Wallet
   * @return {string} Mnemonics
   */
  newMnemonic(): string {
    return Wallet.generateMnemonic();
  }

  /**
   * Add account using Mnemonic phrases
   * @param  {string} phrase - Mnemonic phrase
   * @param  {index} index - index to hdKey root
   *
   * @example
   * ```javascript
   * const mnemonic_1 = 'urge clog right example dish drill card maximum mix bachelor section select';
   * const wallet = new Wallet(customMessenger);
   * wallet.addByMnemonic(mnemonic_1);
   *
   * console.log(wallet.accounts);
   * ```
   */
  addByMnemonic(phrase: string, index: number = 0) {
    if (!this.isValidMnemonic(phrase)) {
      throw new Error(`Invalid mnemonic phrase: ${phrase}`);
    }
    const seed = bip39.mnemonicToSeed(phrase);
    const hdKey = hdkey.fromMasterSeed(seed);
    // TODO:hdkey should apply to Harmony's settings
    const path = this.messenger.chainType === ChainType.Harmony ? '1023' : '60';
    const childKey = hdKey.derive(`m/44'/${path}'/0'/0/${index}`);
    const privateKey = childKey.privateKey.toString('hex');
    return this.addByPrivateKey(privateKey);
  }

  /**
   * Add an account using privateKey
   *
   * @param  {string} privateKey - privateKey to add
   * @return {Account} return added Account
   *
   * @example
   * ```javascript
   * const wallet = new Wallet(customMessenger);
   * const key_1 = '45e497bd45a9049bcb649016594489ac67b9f052a6cdf5cb74ee2427a60bf25e';
   * console.log(wallet.addByPrivateKey(key_1));
   * ```
   */
  addByPrivateKey(privateKey: string): Account {
    try {
      const newAcc = Account.add(privateKey);
      newAcc.setMessenger(this.messenger);
      if (newAcc.address) {
        this.accountMap.set(newAcc.address, newAcc);
        if (!this.defaultSigner) {
          this.setSigner(newAcc.address);
        }
        return newAcc;
      } else {
        throw new Error('add account failed');
      }
    } catch (error) {
      throw error;
    }
  }

  /**
   * Add an account using privateKey
   * @param  {string} keyStore - keystore jsonString to add
   * @param  {string} password - password to decrypt the file
   * @return {Account} return added Account
   */
  async addByKeyStore(keyStore: string, password: string): Promise<Account> {
    try {
      const newAcc = new Account(undefined);
      const result = await newAcc.fromFile(keyStore, password);
      result.setMessenger(this.messenger);
      if (result.address) {
        this.accountMap.set(result.address, result);
        if (!this.defaultSigner) {
          this.setSigner(result.address);
        }
        return result;
      } else {
        throw new Error('add account failed');
      }
    } catch (error) {
      throw error;
    }
  }

  /**
   * create a new account using Mnemonic
   * @return {Account} {description}
   *
   * @example
   * ```javascript
   * console.log(wallet.accounts);
   * wallet.createAccount();
   * wallet.createAccount();
   *
   * console.log(wallet.accounts);
   * ````
   */
  async createAccount(password?: string, options?: EncryptOptions): Promise<Account> {
    const prv = generatePrivateKey();
    const acc = this.addByPrivateKey(prv);
    if (acc.address && password) {
      const encrypted = await this.encryptAccount(acc.address, password, options);
      return encrypted;
    } else if (acc.address && !password) {
      return acc;
    } else {
      throw new Error('create acount failed');
    }
  }

  /**
   * To encrypt an account that lives in the wallet.
   * if encrypted, returns original one, if not found, throw error
   * @param {string} address - address in accounts
   * @param {string} password - string that used to encrypt
   * @param {EncryptOptions} options - encryption options
   * @return {Promise<Account>}
   *
   * @example
   * ```javascript
   * const key_1 = '45e497bd45a9049bcb649016594489ac67b9f052a6cdf5cb74ee2427a60bf25e';
   * wallet.addByPrivateKey(key_1);
   * wallet.encryptAccount('one103q7qe5t2505lypvltkqtddaef5tzfxwsse4z7', '12345').then((value) => {
   *   console.log(value);
   * })
   * ```
   */
  async encryptAccount(
    address: string,
    password: string,
    options?: EncryptOptions,
  ): Promise<Account> {
    try {
      const foundAcc = this.getAccount(address);
      if (foundAcc && foundAcc.privateKey && isPrivateKey(foundAcc.privateKey)) {
        await foundAcc.toFile(password, options);
        return foundAcc;
      } else if (foundAcc && foundAcc.privateKey && !isPrivateKey(foundAcc.privateKey)) {
        return foundAcc;
      } else {
        throw new Error('encrypt account failed');
      }
    } catch (error) {
      throw error;
    }
  }

  /**
   * To decrypt an account that lives in the wallet,if not encrypted, return original,
   * if not found, throw error
   * @param {string} address - address in accounts
   * @param {string} password - string that used to encrypt
   * @return {Promise<Account>}
   *
   * @example
   * ```javascript
   * const key_1 = '45e497bd45a9049bcb649016594489ac67b9f052a6cdf5cb74ee2427a60bf25e';
   * wallet.addByPrivateKey(key_1);
   * wallet.encryptAccount('one103q7qe5t2505lypvltkqtddaef5tzfxwsse4z7', '12345')
   * .then(() => {
   *   wallet.decryptAccount('one103q7qe5t2505lypvltkqtddaef5tzfxwsse4z7', '12345')
   *   .then((value) =>{
   *      console.log(value);
   *   });
   * });
   * ```
   */
  async decryptAccount(address: string, password: string): Promise<Account> {
    try {
      const foundAcc = this.getAccount(address);
      if (foundAcc && foundAcc.privateKey && !isPrivateKey(foundAcc.privateKey)) {
        await foundAcc.fromFile(foundAcc.privateKey, password);
        return foundAcc;
      } else if (foundAcc && foundAcc.privateKey && isPrivateKey(foundAcc.privateKey)) {
        foundAcc.encrypted = false;
        return foundAcc;
      } else {
        throw new Error('decrypt account failed');
      }
    } catch (error) {
      throw error;
    }
  }

  /**
   * Get Account instance using address as param
   * @param  {string} address - address hex
   * @return {Account} Account instance which lives in Wallet
   *
   * @example
   * ```
   * const key_1 = '45e497bd45a9049bcb649016594489ac67b9f052a6cdf5cb74ee2427a60bf25e';
   * wallet.addByPrivateKey(key_1);
   * console.log(wallet.getAccount('one103q7qe5t2505lypvltkqtddaef5tzfxwsse4z7'));
   * ```
   */
  getAccount(address: string): Account | undefined {
    return this.accountMap.get(getAddress(address).basicHex);
  }

  /**
   * @function removeAccount
   * @memberof Wallet
   * @description remove Account using address as param
   * @param  {string} address: - address hex
   */
  removeAccount(address: string): void {
    this.accountMap.delete(getAddress(address).basicHex);
    if (this.defaultSigner === address) {
      this.defaultSigner = undefined;
    }
  }

  /**
   * Set Customer Messenage
   * @param messenger
   *
   * @example
   * ```javascript
   * const customMessenger = new Messenger(
   *   new HttpProvider('https://api.s0.b.hmny.io'),
   *   ChainType.Harmony, // if you are connected to Harmony's blockchain
   *   ChainID.HmyLocal, // check if the chainId is correct
   * )
   * const wallet = new Wallet();
   * wallet.setMessenger(customMessenger);
   * console.log(wallet.messenger);
   * ```
   */
  setMessenger(messenger: Messenger): void {
    this.messenger = messenger;
  }

  /**
   * Set signer
   *
   * @param address one of the address in the accounts
   */
  setSigner(address: string): void {
    if (!isAddress(address) && !this.getAccount(address)) {
      throw new Error('could not set signer');
    }
    this.defaultSigner = address;
  }

  async signTransaction(
    transaction: Transaction,
    account: Account | undefined = this.signer,
    // tslint:disable-next-line: no-unnecessary-initializer
    password: string | undefined = undefined,
    updateNonce: boolean = true,
    encodeMode: string = 'rlp',
    blockNumber: string = 'latest',
  ): Promise<Transaction> {
    const toSignWith = account || this.signer;
    if (!toSignWith) {
      throw new Error('no signer found or did not provide correct account');
    }
    if (toSignWith instanceof Account && toSignWith.encrypted && toSignWith.address) {
      if (!password) {
        throw new Error('must provide password to further execution');
      }
      try {
        const decrypted = await this.decryptAccount(toSignWith.address, password);
        const signed = await decrypted.signTransaction(
          transaction,
          updateNonce,
          encodeMode,
          blockNumber,
        );
        await this.encryptAccount(toSignWith.address, password);
        return signed;
      } catch (error) {
        throw error;
      }
    } else if (toSignWith instanceof Account && !toSignWith.encrypted && toSignWith.address) {
      try {
        const signed = await toSignWith.signTransaction(
          transaction,
          updateNonce,
          encodeMode,
          blockNumber,
        );
        return signed;
      } catch (error) {
        throw error;
      }
    } else {
      throw new Error('sign transaction failed');
    }
  }

  async signStaking(
    staking: StakingTransaction,
    account: Account | undefined = this.signer,
    // tslint:disable-next-line: no-unnecessary-initializer
    password: string | undefined = undefined,
    updateNonce: boolean = true,
    encodeMode: string = 'rlp',
    blockNumber: string = 'latest',
    shardID: number = this.messenger.currentShard,
  ): Promise<StakingTransaction> {
    const toSignWith = account || this.signer;
    if (!toSignWith) {
      throw new Error('no signer found or did not provide correct account');
    }
    if (toSignWith instanceof Account && toSignWith.encrypted && toSignWith.address) {
      if (!password) {
        throw new Error('must provide password to further execution');
      }
      try {
        const decrypted = await this.decryptAccount(toSignWith.address, password);
        const signed = await decrypted.signStaking(
          staking,
          updateNonce,
          encodeMode,
          blockNumber,
          shardID,
        );
        await this.encryptAccount(toSignWith.address, password);
        return signed;
      } catch (error) {
        throw error;
      }
    } else if (toSignWith instanceof Account && !toSignWith.encrypted && toSignWith.address) {
      try {
        const signed = await toSignWith.signStaking(
          staking,
          updateNonce,
          encodeMode,
          blockNumber,
          shardID,
        );
        return signed;
      } catch (error) {
        throw error;
      }
    } else {
      throw new Error('sign transaction failed');
    }
  }

  /**
   * @function isValidMnemonic
   * @memberof Wallet
   * @description check if Mnemonic is valid
   * @param  {string} phrase - Mnemonic phrase
   * @return {boolean}
   * @ignore
   */
  private isValidMnemonic(phrase: string): boolean {
    if (phrase.trim().split(/\s+/g).length < 12) {
      return false;
    }
    return bip39.validateMnemonic(phrase);
  }
}

export { Wallet };