// Additional task
var additionalTask = prompt("switchSizes, switch:if, prompt:or, confirm: or this days, confirm: if this days, triple prompt, default: or, default: if, login and password, currency calc && currency calc: improved, currency calc: two rates, currency calc: if, target, blue belt assignment'")
switch(additionalTask) {

case 'switch:sizes' :

let size = prompt('Enter your size', " ");
switch(size) {
    case '40' :  alert('Your size in Norvay 34 S');
       break;
    case '42' : alert('Your size in Norvay 36 M');
        break;
    case '44' : alert('Your size in Norvay 38');
        break;
    case '46' : alert('Your size in Norvay 40 L');
        break;
    case '48' : alert('Your size in Norvay 42');
        break;
    case '50' : alert('Your size in Norvay 44 XL');
        break;
    case '52' : alert('Your size in Norvay 46');
        break;
    case '54' : alert('Your size in Norvay 54 XXL');
        break;
    default : alert('Sorry but you size not included in our table');
}

break;

case 'switch:if' :

var color = prompt("Введите цвет","");
    if (color == "red") {
    document.write("<div style='background-color: red;'>красный</div>");
    document.write("<div style='background-color: black; color: white;'>черный</div>");
} 
else if (color == "black") {

    document.write("<div style='background-color: black; color: white;'>черный</div>");
} 
else if (color == "blue") {

    document.write("<div style='background-color: blue;'>синий</div>");
    document.write("<div style='background-color: green;'>зеленый</div>");
}
else if (color == "green"){

    document.write("<div style='background-color: green;'>зеленый</div>");
}
else{
    document.write("<div style='background-color: gray;'>Я не понял</div>");
}
break;

case 'prompt:or' : 

var  yearNow = 2020;
var personYears;
var howOldPerson = +prompt('Сколько вам лет') || alert('Error');
var personYears = yearNow - howOldPerson;
 if(howOldPerson!=null) alert('You born in ' +personYears );

 break;

case 'confirm: or this days' :

var shoping = confirm('Shoping?') || alert('You are a caca');
alert('You are the best');

break;

case 'confirm: if this days' :

let soping = confirm('Shoping?');
 if (soping==false) {
alert('You are a caca');
}
else {alert('You are the best');
}

break;

case 'triple prompt' :

var name = prompt("Enter you name", "");
var surname = prompt("Enter you surname", "");
var fathername = prompt("Enter you fathername", "");
alert(name +  ' ' + surname + ' ' + fathername); 
break;


case 'default: or' :

var name = prompt("Enter you name") || "Ivan";
var surname = prompt("Enter you surname") || "Ivanov";
var fatherName = prompt("Enter you fathername") || "Ivanovich";
alert(surname + ' ' + name  + ' ' + fatherName);
 break;


case 'default: if' :

var surnameOne = prompt("Enter you surname");
var nameOne = prompt("Enter you name");
var fatherNameOne = prompt("Enter you fathername");

if (!surnameOne) { surnameOne = 'Ivanov'} 
if (!nameOne) {nameOne = 'Ivan'} 
if (!fatherNameOne) {fatherNameOne = 'Ivanovich'}
alert(surnameOne + ' ' +  nameOne +  ' '  +  fatherNameOne);
break;

case  'login and password' :

var name = 'stas';
var nameTwo = 'alex';
var nameThree = 'pety';
var passworld = 1234;
var passworldTwo = 777;
var passworldThree = 'qwerty'
var loginName = prompt("Enter you name", "") || alert("Enter you name")
var loginPassworld = prompt("Enter you passworld", "") || alert("Enter you passworld")
   
 if (name!==loginName && passworld==loginPassworld || nameTwo!==loginName && passworldTwo==loginPassworld || nameThree!==loginName && passworldThree==loginPassworld){
alert("Wrong name")
}
else if(name==loginName && passworld!==loginPassworld  || nameTwo==loginName && passworldTwo!==loginPassworld || nameThree==loginName && passworldThree!==loginPassworld ){
alert('Passworld is wrong')
}
else if (name==loginName && passworld==loginPassworld || nameTwo==loginName && passworldTwo==loginPassworld || nameThree==loginName && passworldThree==loginPassworld){
alert("Cam in")
}
else if (name!=loginName && passworld!=loginPassworld) {
    alert('anncorect name and passworld')
}else {alert('Cansel')}
break; 

case 'currency calc && currency calc: improved' :


var сurrency = prompt("Enter you currency usd or eur").toLowerCase();
switch(сurrency) {
    case "usd" : currency = 29
        break;
    case "eur" : currency = 33
}
var sum = + prompt("Enter the amount you want to transfer to UAH");
var dubget = sum * currency
alert(dubget)
break;

case 'currency calc: two rates' :

var сurrency = prompt("Enter you currency usd or eur").toLowerCase();
switch(сurrency) {
    case "usd" : currency = 29
        break;
    case "eur" : currency = 33
}
var sum = + prompt("Enter the amount you want to transfer");
var dubget = confirm("Click OK if you want to sell or Cancel if you want to buy") ? dubgett = sum * currency : dubggett = sum / currency;
alert(dubget)
break;


case 'currency calc: if' :

var currencyUsd = 29;
var currencyEur = 33
var currencyOne = prompt("Enter you currency usd or eur").toLowerCase();
var sum = + prompt("Enter the amount you want to transfer");
var dubgett = confirm("Click OK if you want to sell or Cancel if you want to buy")
if (currencyOne === "usd" && sum>0 && dubgett) { var summa = sum * currencyUsd}
if (currencyOne === "usd" && sum>0 && !dubgett) {var summa = sum / currencyUsd}
if (currencyOne === "eur" && sum>0 && dubgett) {var summa = sum * currencyEur}
if (currencyOne === "eur" && sum>0 && !dubgett) {var summa = sum / currencyEur}
alert(summa)
break;

case 'scissors' :

var game = prompt("Choose one from rock, scissors, paper").toLowerCase();
var enemy = Math.floor(Math.random()*3);
if (enemy == 0) {enemy = "rock"}
{if (enemy == "rock" && game == "paper") alert("You have won")}
{if (enemy == "rock" && game == "rock") alert("Draw")}
{if (enemy == "rock" && game == "scissors") alert("Opponent defeated")}
if (enemy == 1) {enemy = "paper"}
{if (enemy == "paper" && game == "paper") alert("Draw")}
{if (enemy == "paper" && game == "rock") alert("Opponent defeated")}
{if (enemy == "paper" && game == "scissors") alert("You have won")}
if (enemy == 2 ) {enemy = "scissors"}
{if (enemy == "scissors" && game == "paper") alert("Opponent defeated")}
{if (enemy == "scissors" && game == "rock") alert("You have won")}
{if (enemy == "scissors" && game == "scissors") alert("Draw")}
break;


case 'blue belt assignment' :

var ratios = {
    usdSell: 25.6,
    eurSell: 29,
    usdBay: 27.8,
    eurBay: 31,
}
var currency = prompt("Enter you currency usd or eur").toLowerCase();
var sum = +prompt("Enter the amount you want to transfer");
let cashUsbSell = sum * ratios["usdSell"];
let cashUsdBay = sum/ratios["usdBay"];
let cashEurSell = sum * ratios["eurSell"];
let cashEurBay = sum/ratios["eurBay"];
    if (currency == 'usd') confirm("Click OK if you want to sell or Cancel if you want to buy") ?alert("Your cash on sale is" + " " + cashUsbSell) : alert("Your cash from the purchase is" + " " + cashUsdBay);
if (currency == 'eur') confirm("Click OK if you want to sell or Cancel if you want to buy") ?alert("Your cash on sale is" + " " + cashEurSell) : alert("Your cash from the purchase is" + " " + cashEurBay);
break;

case 'target' :
// Написать программу которая будет склонять слово товар в зависимости от количества
// товаров в корзине. Например 1 - товар, 4 - товара, 6 - товаров.

var target = ['товар', 'товаров', 'товара']
var number = + prompt("Введите количество товаров")
tipe = Math.abs(number%100)
var numbers = tipe%10
    if (tipe>10 && tipe<20 || numbers>4 && numbers<11) {
        alert(number + ' ' + target[1])

}else if (numbers > 1 && numbers < 5) {
    alert(number + ' ' + target[2])
}else if (numbers == 1) {
alert(number + ' ' + target[0])
}else if (numbers == 0 ) {alert(number + ' ' + target[1])}else {alert("error")}
break;

}