"use strict";

// keyboard layouts
const keyboardLayouts = {
    usQwertyKeyboard: "abcdefghijklmnopqrstuvwxyz".toUpperCase(),
    ruQwertyKeyboard: "йцукеёнгшщзхъфывапролджэячсмитьбю".toUpperCase()
};

const words = [ "google", "speed", "design", "forest", "forever", "love", "horizon", "defect" ];

// game variables
let gameWord = words[Math.floor(Math.random() * words.length)].toUpperCase();

let gameAnswered = new Array(gameWord.length + 1).join("-");

let lives = 6;

// init keyboard
function generateKeyboard(layout) {
    let keyboardHtmlStr = "";
    layout.split("").forEach(function(letter) {
        keyboardHtmlStr = keyboardHtmlStr + '<button class="button clear is-marginless" id="' + letter + '" onclick="letterClick(\'' + letter + "')\"> " + letter + "</button>";
    });
    let keyboard = document.querySelector("#keyboard");
    keyboard.classList.remove("is-hidden");
    document.querySelector("#keyboard").innerHTML = keyboardHtmlStr;
}

// letter click action
function letterClick(letter) {
    let charButton = document.getElementById(letter);
    charButton.disabled = true;
    let indices = [];
    let idx = gameWord.split("").indexOf(letter);
    if (idx == -1) {
        wrongLetter();
        updateStats("stLetterClick");
        return;
    }
    while (idx != -1) {
        indices.push(idx);
        idx = gameWord.split("").indexOf(letter, idx + 1);
    }
    indices.forEach(function(item, indices) {
        let wordArray = gameAnswered.split("");
        wordArray[item] = letter;
        gameAnswered = wordArray.join("");
        document.querySelector("#word").innerHTML = gameAnswered;
        updateStats("stCorrLetter");
    });
    if (gameAnswered.split("").indexOf("-") == -1) {
        updateStats("stWinWords");
        // display win scene
                document.querySelector("#keyboard").innerHTML = '\t\t<img src="https://icongr.am/clarity/happy-face.svg?size=128&color=28bd14">\t\t<h1 class="text-success">Your winner!!</h1>\t\t<button class="button error" onclick="document.location.reload(true);"\t\t>Restart game</button>';
    }
}

// action by wrong letter
function wrongLetter() {
    if (lives <= 0) {
        updateStats("stTotalGames");
        // display hidden word
                document.querySelector("#word").innerHTML = gameWord;
        document.querySelector("#word").classList.add("text-success");
        // display lose scene
                document.querySelector("#keyboard").innerHTML = '\t\t<img src="https://icongr.am/clarity/sad-face.svg?size=128&color=d43939">\t\t<h1 class="text-error">Your lose!!</h1>\t\t<button class="button error" onclick="document.location.reload(true);"\t\t>Restart game</button>';
    }
    lives -= 1;
    document.querySelector("#lives").innerHTML = "Lives " + lives;
}

// display tab content
function showPage(element, pageName) {
    // alert(event.srcElement.id);
    [ "gameButton", "statsButton", "creditsButton" ].forEach(function(item) {
        document.querySelector("#" + item).classList.remove("active");
    });
    document.querySelector("#" + element.id).classList.add("active");
    document.querySelector("#content").innerHTML = pageName;
    if (pageName == pageStatistics) {
        updateStatsPage();
    }
}

// game init
window.onload = function() {
    updateStats("stCheck");
    generateKeyboard(keyboardLayouts["usQwertyKeyboard"]);
    document.querySelector("#lives").innerHTML = "Lives " + lives;
    console.log("Word:", gameWord.toLowerCase());
    document.querySelector("#word").innerHTML = gameAnswered;
    if (window.screen.availWidth <= 599) {
        document.querySelector("#lives").classList.remove("error");
        document.querySelector("#lives").classList.add("dark");
    }
};