// ==UserScript==
    // @name        deckboxCMC
    // @match       https://deckbox.org/sets/*
    // @description Calculates CMC in deckbox sets
    // @version     0.3
    // ==/UserScript==

    var manaCosts = {};
    var totalCosts = [];

    var x = document.getElementsByClassName("mtg_mana");
    var i;
    for (i = 0; i < x.length; i++) {
        var re = /mtg_mana_[0-9URGBWX]/i;
        // console.log("This is a mana cost item: " + x[i].outerHTML);
        var row = x[i].parentElement.parentElement.id;
        // console.log("Parent element is " + row);
        var stripped = x[i].outerHTML.match(re).toString();
        // console.log("This its stripped mana name: " + stripped);
        var strippedMore = stripped.slice(-1);
        //console.log("Mana cost indicated: " + strippedMore);
        var converted = strippedMore.replace(/[URGBW]/, "1");
        var converted = converted.replace(/X/, "0");

        if (!manaCosts[row]) {
            // console.log("Adding new item to manaCosts hash for row " + row);
            // console.log("Found mana cost " + converted + " for row " + row);
            manaCosts[row] = Number(converted);
        } else {
            manaCosts[row] += Number(converted);
            // console.log("Found mana cost " + converted + " for row " + row);
        }
        console.log("Total mana cost for " + row + " is " + manaCosts[row]);
    }

    // Summary of card costs by table row
    console.log("Here's a hash of mana costs: ");
    for (var card in manaCosts) {
        // use hasOwnProperty to filter out keys from the Object.prototype
        if (manaCosts.hasOwnProperty(card)) {
            if (card.indexOf("main") !== -1) {
                console.log("Card " + card + " with cost " + manaCosts[card] + " is in main deck.  Will use to calculate CMC average.");
                totalCosts.push(manaCosts[card]);
            } else {
                console.log("Card " + card + " with cost " + manaCosts[card] + " is not in main deck.  Will NOT use to calculate CMC average.");
            }
        }
    }

    var total = 0;
    console.log("Found " + totalCosts.length + " costs to work with");
    for(var i = 0; i < totalCosts.length; i++) {
        // console.log("Adding mana cost number " + i + " to the total.");
        total += totalCosts[i];
        // console.log("Total is now: " + total);
    }
    console.log("Dividing total mana cost of " + total + " by " + totalCosts.length + " total cards to find the average.");
    var avg = total / totalCosts.length;
    console.log("Agerage CMC: " + avg);

    var box = document.createElement( 'div' );
    box.id = 'myAlertBox';
    box.style.background = 'white';
    box.style.border = '2px solid red';
    box.style.padding = '4px';
    box.style.position = 'absolute';
    box.style.top = '8px';
    box.style.left = '8px';
    box.style.maxWidth = '400px';
    box.textContent = "Converted mana cost: " + avg;
    document.body.appendChild( box );