Initial values for wrapped properties, property wrappers

// property observers (willSet & didSet)
class minibanken{
    var initialValue: Int = 0{
        willSet(newValue){
            print("the new value is: \(newValue)")
        }
        didSet{
            if initialValue > oldValue{
                print("The didSet observer is called after the value of initialValue is updated: \(initialValue)")
                print("the old value was: \(oldValue)")
                print("the total value is now: \(initialValue + oldValue)")
            }
        }
    }
}
var deposit = minibanken()
deposit.initialValue = 200
print("\nthe did is not invoke if value wasn't updated",deposit.initialValue = 200)

print(" \n ", deposit.initialValue = 300)



// property wrappers
@propertyWrapper
struct thirtyOrLess{
    private var number = 0
    var wrappedValue: Int{
        get {return number}
        set {number = min(newValue, 30 - 4)}
    }
}
struct inputNumber{
    @thirtyOrLess var presentInJune: Int
    @thirtyOrLess var presentInApril: Int
// @thirtyOrLess written as a attribute 
}
var present = inputNumber()
present.presentInJune = 20
present.presentInApril = 31
print("presents in june are: \(present.presentInJune)")
print("presents in june are: \(present.presentInApril)")



// initial values for wrapped properties
@propertyWrapper
struct presentCount{
    private var maximumDays = 0
    private var number = 0
    var wrappedValue: Int{
        get {return number}
        set {number = min(newValue, maximumDays)}
    }
    
    init(){
    maximumDays = 27
    number = 0
    }
    init(wrappedValue: Int){
        maximumDays = 24
        number = min(wrappedValue, maximumDays)
    }
    init(wrappedValue: Int, maximumDays: Int){
        self.maximumDays = maximumDays
        number = min(wrappedValue, maximumDays)
    }
}

struct thirtyDayMonths{
    @presentCount(wrappedValue: 0, maximumDays: 26 ) var june: Int 
    @presentCount(wrappedValue: 0, maximumDays: 26 ) var november: Int 
    @presentCount(wrappedValue: 0, maximumDays: 26 ) var april: Int 
    @presentCount(wrappedValue: 0, maximumDays: 26 ) var september: Int 
}
var fourMonths = thirtyDayMonths()
fourMonths.june = 15
fourMonths.november = 20
fourMonths.april = 25
fourMonths.september = 10
print("working days of june was: \(fourMonths.june)")
print("working days of june was: \(fourMonths.november)")
print("working days of june was: \(fourMonths.april)")
print("working days of june was: \(fourMonths.september)")


struct FebruaryMonth{
    @presentCount(wrappedValue: 20) var february: Int
}
var februaryMonth = FebruaryMonth()
februaryMonth.february = 25
print("\nworking days of february was: \(februaryMonth.february)")


struct Day31Months{
        @presentCount var january: Int
         @presentCount var march: Int
          @presentCount var may: Int
           @presentCount var july: Int
            @presentCount var august: Int
             @presentCount var october: Int
              @presentCount var december: Int
        
}
var day31Months = Day31Months()
day31Months.january = 30
day31Months.march = 13
day31Months.may = 14
day31Months.july = 15
day31Months.august = 16
day31Months.october = 17
day31Months.december = 18
print("\n working days of january was: \(day31Months.january) ")
print("working days of march was: \(day31Months.march) ")
print("working days of may was: \(day31Months.may) ")
print("working days of july was: \(day31Months.july) ")
print("working days of august was: \(day31Months.august) ")
print("working days of october was: \(day31Months.october) ")
print("working days of december was: \(day31Months.december) ")