SwiftBank Project Solution

SwiftBank.swift

// Write your code below 🏦
struct SwiftBank {
  private let password: String
  private var balance: Double = 0 {
    didSet {
      if balance < 100 {
        displayLowBalanceMessage()
      }
    }
  }

  static let depositBonusRate = 0.01

  var depositBonusClaimed: Bool = false

  init(password: String, initialDeposit: Double) {
    self.password = password

    makeDeposit(ofAmount: initialDeposit)
  }
    
  private func isValid(_ enteredPassword: String) -> Bool {
    if enteredPassword == password {
        return true
    } else {
      return false
    }
  }

  private func finalDepositWithBonus(fromInitialDeposit deposit: Double) -> Double {

    return deposit + (deposit * SwiftBank.depositBonusRate)
  }

  mutating func makeDeposit(ofAmount depositAmount: Double) {

    // Should not take negative values
    if depositAmount <= 0 {
      print("Cannot deposit $\(depositAmount)")
      return
    }

    if depositAmount >= 1000 && !depositBonusClaimed {
      let depositWithBonus = finalDepositWithBonus(fromInitialDeposit: depositAmount)

      print("Making a deposit of $\(depositAmount) with a bonus rate. The final amount deposited is $\(depositWithBonus)")

      balance += depositWithBonus

      depositBonusClaimed = true // Bonus can only be claimed once
    } else {
      print("Making a deposit of $\(depositAmount) without a bonus rate. The final amount deposited is $\(depositAmount)")
      balance += depositAmount
    }
  }

  func displayBalance(usingPassword password: String) {
    if !isValid(password) {
      print("Error: Invalid password. Cannot retrieve balance.")
      return
    }

    print("Your current balance is $\(balance)")
  }

  mutating func makeWithdrawal(ofAmount withdrawalAmount: Double, usingPassword password: String) {
    if !isValid(password) {
      print("Error: Invalid password. Cannot make withdrawal.")
      return
    }

    if withdrawalAmount <= 0 {
      print("Can't withdraw amount less than or equal to Zero.")
      return
    }

    if withdrawalAmount > balance {
      print("You can't withdraw an amount more than your current balance.")
      displayBalance(usingPassword: password)
      return
    }

    balance -= withdrawalAmount

    print("Making a $\(withdrawalAmount)")
  }

  private func displayLowBalanceMessage() {
    print("Alert: Your balance is under $100")
  }
}


// =============

var myAccount = SwiftBank(password: "MyPassword", initialDeposit: 500)
myAccount.makeDeposit(ofAmount: 50)
// myAccount.makeWithdrawal(ofAmount: 100, usingPassword: "LucasPass")
myAccount.makeWithdrawal(ofAmount: 100, usingPassword: "MyPassword")



// Challenge #18
// Deposit with a bonus
myAccount.makeDeposit(ofAmount: 1000)

// Deposit $1000 or more again. Deposit bonus can only be claimed once 
myAccount.makeDeposit(ofAmount: 1000)

// Challenge #19
// Deposit negative amount or zero amount
myAccount.makeDeposit(ofAmount: -100)
myAccount.makeDeposit(ofAmount: 0)

// Withdraw negative amount or zero amount
myAccount.makeWithdrawal(ofAmount: -100, usingPassword: "MyPassword")
myAccount.makeWithdrawal(ofAmount: 0, usingPassword: "MyPassword")

// Withdraw more cash than they have in the bank
myAccount.makeWithdrawal(ofAmount: 50000, usingPassword: "MyPassword")

// Check balance
// myAccount.displayBalance(usingPassword: "MyPassword")