"use strict";

$(function(){

    var getTextNodesIn = function(el) {
        return $(el).find(":not(iframe)").addBack().contents().filter(function() {
            return this.nodeType == 3;
        });
    };

    // var textNodes = getTextNodesIn($("p, h1, h2, h3"));
    var textNodes = getTextNodesIn($("*"));



    function isLetter(char) {
        return /^[\d]$/.test(char);
    }


    var wordsInTextNodes = [];
    for (var i = 0; i < textNodes.length; i++) {
        var node = textNodes[i];

        var words = []

        var re = /\w+/g;
        var match;
        while ((match = re.exec(node.nodeValue)) != null) {

            var word = match[0];
            var position = match.index;

            words.push({
                length: word.length,
                position: position
            });
        }

        wordsInTextNodes[i] = words;
    };


    function messUpWords () {

        for (var i = 0; i < textNodes.length; i++) {

            var node = textNodes[i];

            for (var j = 0; j < wordsInTextNodes[i].length; j++) {

                // Only change a tenth of the words each round.
                if (Math.random() > 1/10) {

                    continue;
                }

                var wordMeta = wordsInTextNodes[i][j];

                var word = node.nodeValue.slice(wordMeta.position, wordMeta.position + wordMeta.length);
                var before = node.nodeValue.slice(0, wordMeta.position);
                var after  = node.nodeValue.slice(wordMeta.position + wordMeta.length);

                node.nodeValue = before + messUpWord(word) + after;
            };
        };
    }

    function messUpWord (word) {

        if (word.length < 3) {

            return word;
        }

        return word[0] + messUpMessyPart(word.slice(1, -1)) + word[word.length - 1];
    }

    function messUpMessyPart (messyPart) {

        if (messyPart.length < 2) {

            return messyPart;
        }

        var a, b;
        while (!(a < b)) {

            a = getRandomInt(0, messyPart.length - 1);
            b = getRandomInt(0, messyPart.length - 1);
        }

        return messyPart.slice(0, a) + messyPart[b] + messyPart.slice(a+1, b) + messyPart[a] + messyPart.slice(b+1);
    }

    // From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random
    function getRandomInt(min, max) {

        return Math.floor(Math.random() * (max - min + 1) + min);
    }


    setInterval(messUpWords, 50);
});