// Based on impeachGod code at http://impeachgod.webs.com/wordle.js
// for the word frequency handling

(function(){

    var wordMatcher = /[A-Za-z0-9_\-]+/g;
    var commonWords = ["the", "of", "to", "and", "a", "in", "is", "it", 
        "that", "was", "for", "on", "are", "with", "as", "be", "at", 
        "one", "have", "this", "from", "or", "had", "by", "but", "some", 
        "out", "were", "all", "when", "an", "each"];
    var maxFreq = 0;
    var fontMin = 20;
    var fontMax = 70;
    var maxWords = 100;

    var JQUERY_URL = 'http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js';
    var CSS_URL = '';

    /* Bookmarklet code (change the url of the script to where you're hosting it):
javascript:function%20loadScript(scriptURL)%20{%20var%20scriptElem%20=%20document.createElement('SCRIPT');%20scriptElem.setAttribute('language',%20'JavaScript');%20scriptElem.setAttribute('src',%20scriptURL);%20document.body.appendChild(scriptElem);}%20loadScript('http://fsavard.com/code/wordcloud.js');
    */

    //////////////////////////////////////////////////////////////////////////
    // Load CSS

    /*var headID = document.getElementsByTagName("head")[0];         
    var cssNode = document.createElement('link');
    cssNode.type = 'text/css';
    cssNode.rel = 'stylesheet';
    cssNode.href = CSS_URL;
    cssNode.media = 'screen';
    headID.appendChild(cssNode);*/

    //////////////////////////////////////////////////////////////////////////
    // Jquery loading

    // Add jQuery
    var GM_JQ = document.createElement('script');
    GM_JQ.src = JQUERY_URL;
    GM_JQ.type = 'text/javascript';
    document.getElementsByTagName('head')[0].appendChild(GM_JQ);

    // Check if jQuery's loaded
    function GM_wait() {
        if(typeof window.jQuery == 'undefined') { window.setTimeout(GM_wait,100); }
    else { $ = window.jQuery; letsJQuery(); }
    }
    GM_wait();



    //////////////////////////////////////////////////////////////////////////
    // Actual functionality

    
    // Based on http://refactormycode.com/codes/341-jquery-all-descendent-text-nodes-within-a-node
    function extractText() {
        ret = [];
        $(document.body).contents().each( function() {
            var fn = arguments.callee;
            if ( this.nodeType == 3 ) 
                ret.push( this.nodeValue );
            else $(this).contents().each(fn);
        });
        return ret.join(' ');
    }

    // Based on impeachGod code at http://impeachgod.webs.com/wordle.js

    
    function parseWords(txt) {


        var words = txt.match(wordMatcher);
        var i;
        // convert to lowercase
        for (i = 0; i < words.length; i++) {
            words[i] = words[i].toLowerCase();
        }
        return words;
    }
    
    function countFrequencies(words) {
        var freqs = {};
        var word;
        var i;
    
        // count word occurence frequencies
        for (i = 0; i < words.length; i++) {
            if (freqs[words[i]] === undefined) {
                freqs[words[i]] = 1;
            } else {
                freqs[words[i]]++;
                if(freqs[words[i]] > maxFreq){
                    maxFreq = freqs[words[i]];
                }
            }
        }
        // remove common words
        for (i = 0; i < commonWords.length; i++) {
            delete freqs[commonWords[i]];
        }
        // convert to array
        var freqsArray = [];
        for (word in freqs) {
            if (freqs.hasOwnProperty(word)) {
                freqsArray.push({"word": word, "freq": freqs[word]});
            }
        }
        return freqsArray;
    }

    // Adapted to scale
    function scale(freqs) {
        var i;
        for (i = 0; i < freqs.length; i++) {
            freqs[i].fontSize = Math.round(freqs[i].freq/maxFreq * (fontMax - fontMin) + fontMin);
        }
    }


    function makeCloud(freqs) {
        var div = $(document.createElement('div'));
        div.attr('style','position: fixed; left: 15px; top: 15px; z-index: 999; display: block; width: 90%; border: 1px solid black; padding: 30px; margin: 10px 10px; background-color: #74adcb;');

        spans = []
    
        for(var i=0; i<freqs.length; i++){
            spans.push("<span style='font-size: "+freqs[i].fontSize+"px;'>"+freqs[i].word+"</span> ");
        }

        div.append(spans.join(" "));

        $(document.body).append(div);
    }

    //////////////////////////////////////////////////////////////////////////
    // Go

    // All your GM code must be inside this function
    function letsJQuery() {
        var txt = extractText();
        var words = parseWords(txt);
        var freqs = countFrequencies(words);

        freqs = freqs.sort(function(a, b) {
                return b.freq - a.freq;
            });

        // Keep only the first
        if(freqs.length > maxWords) {
            freqs.splice(maxWords, freqs.length - maxWords);
        }

        freqs = freqs.sort(function(a, b) {
                return b.word < a.word;
            });

        scale(freqs);
        
        makeCloud(freqs);
    }

})();