const places = [
    "forest",
    "castle",
    "farm",
    "island",
    "school",
    "prison",
    "restaurant",
    "mountain",
    "Tokyo",
    "boat",
    "house",
    "Chicago",
    "desert",
    "mall",
    "space",
]
const characters = [
    "knight",
    "wizard",
    "detective",
    "student",
    "grandmother",
    "teacher",
    "chef",
    "viking",
    "cat",
    "monster",
    "dog",
    "ninja",
    "ghost",
    "pirate",
    "doctor",
]
const objects = [
    "wand",
    "sword",
    "book",
    "knife",
    "feather",
    "rock",
    "bag",
    "glasses",
    "necklace",
    "nugget",
    "phone",
    "lamp",
    "cup",
    "laptop",
    "headset",
]
const columnplaces = document.querySelector('#places')
const columncharacters = document.querySelector('#characters')
const columnobjects = document.querySelector('#objects')
const buttonstartgame = document.querySelector('#startgame')

function GenerateNewList(list) {
    const items = []
    for (let i = 0; i < 1000; i++) {
        items.push(list[Math.floor(Math.random() * list.length)])
    }
    return items
}

function UpdateColumn(column, list) {
    const items = GenerateNewList(list)
    column.innerHTML = items.join('<br>')
}

function DoScroll(column, top, divider, currentTop) {
    const newTop = currentTop + (top/divider)

    column.scrollTo({
        top: newTop,
        behavior: 'smooth'
    })

    if (newTop < top) {
        window.setTimeout(function () {
            DoScroll(column, top, divider, newTop)
        }, 200)        
    }
}

function StartGame() {
    columnplaces.scrollTo(0, 0)
    columncharacters.scrollTo(0, 0)
    columnobjects.scrollTo(0, 0)

    window.setTimeout(function () {
        UpdateColumn(columnplaces, places)
        UpdateColumn(columncharacters, characters)
        UpdateColumn(columnobjects, objects)

        DoScroll(columnplaces, 10040, 15, 0)
        DoScroll(columncharacters, 10040, 20, 0)
        DoScroll(columnobjects, 10040, 25, 0)

    }, 10)
}

buttonstartgame.addEventListener('click', StartGame)