// switch: sizes
let usSize = [
    {
        number: [6],
        men: 'S',
        woman:['XXS']
    },
    {
        number: [8, 10],
        men: 'M',
        woman:['XXS', 'XS']
    },
    {
        number: [12, 14],
        men: 'L',
        woman:['S', 'M']
    },
    {
        number: [16, 18],
        men: 'XL',
        woman:['L','XL']
    },
    {
        number: [20, 22],
        men: 'XXL',
        woman:['XXL', 'XXXL']
    },
]

let rusSize = prompt('Введите НАШ формат размера для переводa на на Американский формат','')

switch(+rusSize && +rusSize >= 40 && +rusSize <= 56) {
    case true:
        rusSize = +rusSize
        let flag = 0

        switch(rusSize % 2 !== 0) {
            case true:
                rusSize--
                flag++
        }

        for(let i = 0; i < usSize.length; i++) {
            let temp = usSize[i].number.findIndex(element => { return element === (rusSize - 34)})
            switch( temp >= 0) {
                case true:
                        alert(`
                            ${rusSize+flag}-й размер в американском формате:
                            +---------------------------------------+
                                Размер: ${usSize[i].number[temp]}
                                Мужчины: ${usSize[i].men}
                                Женщины: ${usSize[i].woman[temp]}
                            +---------------------------------------+
                        `)
                        i = usSize.length
                    break;

                default:
                    continue;
            }
        }
        break;

    case false:
        alert('Неправильный размер.')
        break;
}

//switch: if
let color = prompt("Введите цвет","");
switch (color){
    case "red": document.write("<div style='background-color: red;'>красный</div>");
    case "black": document.write("<div style='background-color: black; color: white;'>черный</div>");
                break;
    case "blue": document.write("<div style='background-color: blue;'>синий</div>");
    case "green": document.write("<div style='background-color: green;'>зеленый</div>");
                break;
    default: document.write("<div style='background-color: gray;'>Я не понял</div>");
}

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

//prompt: or
let age = prompt('Введите свой возраст', '') || alert('Вы не ввели ничего!')
if (age && isNaN(age) || age > 200 || age < 0){
    alert('Вы ввели неверные данные!')    
} else if(age){
    age = age = Math.trunc(Number(age))
    res = new Date().getFullYear() - age
    alert(`Исходя из введенного вами возраста вы родились в ${res}г. либо ${res-1}г.`)
}

//confirm: or this days
confirm('шоппинг') || alert('ты-бяка') 

//confirm: if this days
if(!confirm('шоппинг')) {
    alert('ты-бяка')
}

//triple prompt
let Name = prompt('your Name:','')
let surname = prompt('your Surname:','')
let patronymic = prompt('your Patronymic:','')
alert(`${surname} ${Name} ${patronymic}`)

//default: or
let defaultName = prompt('your Name:','') || 'Иван'
let defaultSurname = prompt('your Surname:','') || 'Иванов'
let defaultPatronymic = prompt('your Patronymic:','')  || 'Иванович'
alert(`${defaultSurname} ${defaultName} ${defaultPatronymic}`)

// default: if
if(Name) {
    Name = Name
} else {
    Name = 'Ivan'
}
if(surname) {
    surname = surname
} else {
    surname = 'Ivanov'
}
if (patronymic) {
    patronymic = patronymic
} else {
    patronymic = 'Ivanovich'
}

alert(`Triple promt, but using "if else" to add default values:
    ${surname} ${Name} ${patronymic}`)

//login and password
if(prompt('login','') === 'admin') {
    alert('correct login')
    if(prompt('password','') === 'qwerty') {
        alert('correct password')
    } else {
        alert('wrong password')
    }
} else {
    alert('wrong login')
}

//currency calc
function truncateFraction (number) {
    try {
        let strNum = String(number).split('.')
        if(strNum[1].length > 2) {
            strNum[1] = strNum[1].slice(0, 2)
        }
        return Number(strNum.join('.'))
    } catch (e) {
        return number
    }
}

let curr = prompt('type currency: "eur" or "usd"','')
let transferLog = {
    initial: 'hrn',
    to: '',
    ratios: {
        sold: {
            usd: 0.032,
            eur: 0.037,
            setUsd: function(value) {
                this.usd = value
            },
            setEur: function(value) {
                this.eur = value
            }
        },
        bought: {
            usd: 0.033,
            eur: 0.038
        }
    }
}

//currency calc:if
if(curr) {

    // switch(curr.toLocaleLowerCase()) {
    //     case 'eur':
    //         transferLog.to = 'eur'
    //         confirm('Sell  press "Ok" | Buy press "Cancel"')? transferLog.curr = [transferLog.ratios['sold']['usd'], 'sold'] : transferLog.curr = [transferLog.ratios['bought']['usd'], 'bought']
    //         break;
    //     case 'usd':
    //         transferLog.to = 'usd'
    //         confirm('Sell  press "Ok" | Buy press "Cancel"')? transferLog.curr = [transferLog.ratios['sold']['eur'], 'sold'] : transferLog.curr = [transferLog.ratios['bought']['eur'], 'bought']
    //         break;
    // }


    if(curr.toLocaleLowerCase() === 'eur') {
        transferLog.to = 'eur'
        confirm('Sell  press "Ok" | Buy press "Cancel"')? transferLog.curr = [transferLog.ratios['sold']['usd'], 'sold'] : transferLog.curr = [transferLog.ratios['bought']['usd'], 'bought']
    }
    if(curr.toLocaleLowerCase() === 'usd') {
        transferLog.to = 'usd'
        confirm('Sell  press "Ok" | Buy press "Cancel"')? transferLog.curr = [transferLog.ratios['sold']['eur'], 'sold'] : transferLog.curr = [transferLog.ratios['bought']['eur'], 'bought']
    }
    
    if(transferLog.to === 'eur' || transferLog.to === 'usd') {
        transferLog.money = prompt('input amount of money to give', '')
        if(!+transferLog.money) {
            alert('invalid input')
        } else {
            transferLog.given = Number(transferLog.money)
            if(transferLog.curr[1] === 'sold') {
                transferLog.money = truncateFraction(transferLog.given / transferLog.curr[0])
                transferLog.message = `You've ${transferLog.curr[1]} ${transferLog.given}${transferLog.to} for ${transferLog.money}${transferLog.initial}`
    
            } else if(transferLog.curr[1] === 'bought') {
                transferLog.money = truncateFraction(transferLog.given * transferLog.curr[0])
                transferLog.message = `You've ${transferLog.curr[1]} ${transferLog.money}${transferLog.to} for ${transferLog.given}${transferLog.initial}`
            }  
            transferLog.money > 0? alert(transferLog.message) : alert(`Looks like there is too little amount of hrn given to translate to ${transferLog.to}`)
        }
    } else {
        alert('invalid input')
    }
} else {
    alert('No input.')
}

// scissors
let combos = {
    paper: {
        conter: 'scissors'
    },
    scissors: {
        conter: 'rock'
    },
    rock: {
        conter: 'paper'
    }
}

let user = prompt('rock, paper, scissors?').toLocaleLowerCase()

if(user === 'rock' || user === 'paper' || user === 'scissors') {
    let computer = Math.random()

    if(computer >= 0.6) {
        computer = 'scissors'
    } else if(computer <= 0.3) {
        computer = 'paper'
    } else {
        computer = 'rock'
    }
    alert(`computer: ${computer}`)

    if(user === computer) {
        alert('TIE')
    } else {
        combos[computer].conter === user ? alert('USER WINS.') : alert('COMPUTER WINS.')
    }
} else {
    alert('user disqualified! Compuer wins!')
}