class Bank {
  constructor(bankName) {
    this._bankName = bankName;
    this.allCustomers = [];
  }

  newCustomer({ firstName, lastName, personalId }) {
    let hasCustomer = this.allCustomers.find(
      (customer) => customer.personalId === personalId
    );

    if (hasCustomer) {
      throw new Error(`${firstName} ${lastName} is already our customer!`);
    }

    let customer = { firstName, lastName, personalId };
    this.allCustomers.push(customer);

    return customer;
  }

  depositMoney(personalId, amount) {
    let currentCustomer = this.getCustomerById(personalId);

    if (currentCustomer.totalMoney) {
      currentCustomer.totalMoney += amount;
    } else {
      currentCustomer.totalMoney = amount;
      currentCustomer.transactions = [];
    }

    currentCustomer.transactions.push(
      `${currentCustomer.firstName} ${currentCustomer.lastName} made deposit of ${amount}$!`
    );

    return `${currentCustomer.totalMoney}$`;
  }

  withdrawMoney(personalId, amount) {
    let currentCustomer = this.getCustomerById(personalId);

    if (currentCustomer.totalMoney < amount) {
      throw new Error(
        `${currentCustomer.firstName} ${currentCustomer.lastName} does not have enough money to withdraw that amount!`
      );
    } else {
      currentCustomer.totalMoney -= amount;
      currentCustomer.transactions.push(
        `${currentCustomer.firstName} ${currentCustomer.lastName} withdrew ${amount}$!`
      );
    }

    return `${currentCustomer.totalMoney}$`;
  }

  customerInfo(personalId) {
    let currentCustomer = this.getCustomerById(personalId);

    let output = `Bank name: ${this._bankName}\nCustomer name: ${currentCustomer.firstName} ${currentCustomer.lastName}\nCustomer ID: ${personalId}\nTotal Money: ${currentCustomer.totalMoney}$\n`;

    if (currentCustomer.transactions.length > 0) {
        output += 'Transactions:\n';
        for(let i = currentCustomer.transactions.length; i > 0; i-- ) {
            output += `${i}. ${currentCustomer.transactions[i - 1]}\n`;
        }
    }

    return output.trim();
  }

  getCustomerById(personalId) {
    let currentCustomer = this.allCustomers.find(
      (customer) => customer.personalId === personalId
    );

    if (!currentCustomer) {
      throw new Error(`We have no customer with this ID!`);
    }

    return currentCustomer;
  }
}