import Cocoa

func greet(_ person: String, on day: String) -> String {
    return "Hello \(person), today is \(day)."
}

// "Hello Tony Bark, today is Tuesday."
greet("Tony Bark", on: "Tuesday")

func calcStats(scores: [Int]) -> (min: Int, max: Int, sum: Int) {
    var min = scores[0]
    var max = scores[0]
    var sum = 0
    
    for score in scores {
        if score > max {
            max = score
        } else if score < min {
            min = score
        }
        sum += score
    }
    
    return (min, max, sum)
}

let stats = calcStats(scores: [5, 3, 100, 3, 9])
let sum = stats.sum // 120

class NamedShape {
    var numberOfSides = 0
    var name: String
    
    init(name: String = "Heptagon") {
        self.name = name
    }
    
    func simpleDescription() -> String {
        return "A shape with \(numberOfSides) sides."
    }
}

class Square: NamedShape {
    var sideLength: Double
    
    init(sideLength: Double, name: String = "Square") {
        self.sideLength = sideLength
        super.init(name: name)
    }
    
    func area() -> Double {
        return sideLength * sideLength
    }
    
    override func simpleDescription() -> String {
        return "A Square with \(numberOfSides) sides."
    }
}

class EquilateralTriangle: NamedShape {
    var sideLength: Double
    
    var perimeter: Double {
        get {
            return 3.0 * sideLength
        }
        
        set {
            sideLength = newValue / 3.0
        }
    }
    
    init(sideLength: Double, name: String = "Square") {
        self.sideLength = sideLength
        super.init(name: name)
        numberOfSides = 3
    }
    
    func area() -> Double {
        return sideLength * sideLength
    }
    
    override func simpleDescription() -> String {
        return "A Equilateral Triangle with \(numberOfSides) sides."
    }
}

var shape = NamedShape()
shape.numberOfSides = 7
shape.simpleDescription()

var square = Square(sideLength: 5.2)
square.area()
square.simpleDescription()