functions in swift

//: Playground - noun: a place where people can play

import Foundation

//basic syntax
func sayHello () {
    print("hello")
}

sayHello()

//parameters
func sayGoodBye(time: Int, to: String) {
        print("\(time) \(to)")
}

sayGoodBye(time: 0, to: "pepe")


//return tipe
func returnCompletString(basicString: String) -> (String) {
    
    return ("\(basicString) es mas completa")
}

print(returnCompletString(basicString: "esta funcion retorna y.."))

var extras:  Dictionary = ["piña" : 0.45, "salame" : 0.90, "peperoni" : 0.44]


//return an new price
func addExtraIngredient(extras: [String: Double] ,
                        ingredientName: String,
                        quantity: Int) -> Double? {
    
//    if let unitPrice = extras[ingredientName] {
//    let finalPrice = Double(quantity) * unitPrice
//    return finalPrice
//    }
//    return 0
    
    //introducing Guard
    guard let unitPrice = extras[ingredientName] else {
        return nil
    }
    return Double(quantity) * unitPrice
}


let finalPrice = addExtraIngredient(extras: extras, ingredientName: "piña", quantity: 4)

print(finalPrice!)

//Introducing tuples, if we dont use labels for parameters we can use the indexvalue of the tuple

let company = ("Apple",  "apple.inc" , 89)
company.0
company.1

let (stockCode, companyName , stockPrice) = ("Apple",  "apple.inc" , 89)
print("el valor de bolsa de \(stockCode) es \(stockPrice)")

//better to integrate both
let stocksCompany = (id: "Apple", companyName: "apple.inc", stockPrice:89)
stocksCompany.companyName


func getProduct(idProduct: Int) -> (id: String, name: String, price: Double) {
    
    var id = "IPHOTO", name = "Iphone 5", price = 777
    
    switch idProduct {
    case 1:
        id = "iph5"
        name = "iphone 6"
        price = 77777
    case 2:
        id = "iph57"
        name = "iphone 7"
        price = 77777
    case 3:
        id = "iph55"
        name = "iphone 8"
        price = 77777
    default:
        break
    }
    
    return (id, name, Double(price))

}

let product = getProduct(idProduct: 2)


//functionswith default values and external variables


func area(length: Int, width:Int) -> Int {
    
    let area = length * width
    return area
}


func getAreaBasedOn(length:Int, width:Int, forCarpetType carpet:String = "tan") -> Int {
    
    let areaOfRoom = area(length:length, width:width)
    var price = 0
    
    switch carpet {
    case "tan": price = areaOfRoom*1
    case "red": price = areaOfRoom*2
    case "blue": price = areaOfRoom*3
    default:price = 0
    }
    return price
}

getAreaBasedOn(length: 10, width: 10, forCarpetType: "blue")
getAreaBasedOn(length: 30, width: 30)//default value not related with the default of the switch

//function with no arguments labels

func somefunction(_ test:Int) {
    print(test)
}

somefunction(5)

//code challenge
func coordinates(for location:String)-> (Double, Double) {
    
    var tuple = (Double(0),Double(0))
    
    switch location {
    case "Eiffel Tower": tuple = (48.8582,2.2945)
    case "Great Pyramid": tuple =  (29.9792, 31.1344)
    case "Sydney Opera House": tuple = (33.8587,151.2140)
    default: tuple = (Double(0),Double(0))    }
    return tuple
}

coordinates(for:  "Eiffel Tower")