// ==UserScript==
// @name           Fiddle-ify!
// @author         Cameron Bernhardt (AstroCB)
// @version        0.2.0
// @namespace      http://github.com/AstroCB
// @description    Converts code blocks on Stack Overflow into JSFiddles with a few clicks
// @include        http://stackoverflow.com/*
// @downloadURL none
// ==/UserScript==

var tags = document.getElementsByClassName("post-taglist")[0].children;
var tagged = false, jQuery = false;
var index = 0;
var html, css, javascript; //store contents of selected code blocks
var blocks = document.getElementsByClassName("default prettyprint prettyprinted"); //get code blocks

for (var i = 0; i < tags.length; i++) {
    var tagName = tags[i].innerHTML;
    if (tagName === "html" || tagName === "css" || tagName === "javascript") { //check if tagged HTML, CSS, or JavaScript
        tagged = true;
    }

    if(tagName === "jQuery"){
      jQuery = true;
    }
}

if (tagged && blocks) { //only display button if tagged HTML, CSS, or JavaScript and has code blocks
  //(TODO: add jQuery support (toggle menu in Fiddle))
    var question = document.getElementsByClassName("vt")[0];
    question.innerHTML += "<br/><button id='fiddleify'>Fiddle-ify!</button>"; //inject "Fiddle-ify" button

    document.getElementById("fiddleify").addEventListener("click", function () { //listen for "enter" keypresses for skipping
        alert("Click a code block for HTML or press enter to skip.");
        document.addEventListener("keyup", function (e) {
            if (e.which === 37) {
                e.preventDefault();
                assign(null, index);
                index++;
            }
        });

        for (var j = 0; j < blocks.length; j++) {
            blocks[j].addEventListener("click", function () { //listen for clicks on code blocks
                if(index === 0){
                  this.style.backgroundColor = "orange";
                }else if(index == 1){
                  this.style.backgroundColor = "blue";
                }else if(index == 2){
                  this.style.backgroundColor = "yellow";
                }
                assign(this.children[0].children, index);
                index++;
            });
        }
    });
}

function assign(element, num) {
    switch (num) { //instructions for each click: HTML -> CSS -> JavaScript (runs for both "enter" keypresses and block clicks)
        case 0:
            html = element;
            alert("Click a code block for CSS or press enter to skip.");
            break;
        case 1:
            css = element;
            alert("Click a code block for JavaScript or press enter to skip.");
            break;
        case 2:
            javascript = element;
            run();
            break;
        default:
            console.log("Finished");
    }
}

function run() { //unwrap text from code blocks (each word is in its own span)
    confirm("Loading JSFiddle...");
    var htmlText = "",
        cssText = "",
        jsText = "";
    for (var x = 0; x < html.length; x++) {
        htmlText += html[x].innerHTML;
    }

    for (var y = 0; y < css.length; y++) {
        cssText += css[y].innerHTML;
    }

    for (var z = 0; z < javascript.length; z++) {
        jsText += javascript[z].innerHTML;
    }

    var post = new XMLHttpRequest(); //create POST request for Fiddle
    var url = "//jsfiddle.net/api/post/";

    if(jQuery){ //determine whether to use jQuery
      url += "jquery/2.1.0";
    }else{
      url += "library/pure";
    }

    var data = {
      "html": html,
      "css": css,
      "js": javascript,
    }

    post.open("post", url, true);

    post.send(data);

    console.log(post);

  }