/*
   * Pixastic Lib - Core Functions - v0.1.2
   * Copyright (c) 2008 Jacob Seidelin, cupboy@gmail.com, http://blog.nihilogic.dk/
   * MIT License [http://www.opensource.org/licenses/mit-license.php]
   */
  
  var Pixastic = (function() {
  
          function addEvent(el, event, handler) {
                  if (el.addEventListener)
                          el.addEventListener(event, handler, false); 
                  else if (el.attachEvent)
                          el.attachEvent("on" + event, handler); 
          }
  
          function onready(handler) {
                  var handlerDone = false;
                  var execHandler = function() {
                          if (!handlerDone) {
                                  handlerDone = true;
                                  handler();
                          }
                  }
                  document.write("<"+"script defer src=\"//:\" id=\"__onload_ie_sumbox__\"></"+"script>");
                  var script = document.getElementById("__onload_ie_sumbox__");
                  script.onreadystatechange = function() {
                          if (script.readyState == "complete") {
                                  script.parentNode.removeChild(script);
                                  execHandler();
                          }
                  }
                  if (document.addEventListener)
                          document.addEventListener("DOMContentLoaded", execHandler, false); 
                  addEvent(window, "load", execHandler);
          }
  
          function init() {
                  if (!Pixastic.parseOnLoad) return;
                  var imgEls = getElementsByClass("pixastic", null, "img");
                  var canvasEls = getElementsByClass("pixastic", null, "canvas");
                  var elements = imgEls.concat(canvasEls);
                  for (var i=0;i<elements.length;i++) {
                          (function() {
  
                          var el = elements[i];
                          var actions = [];
                          var classes = el.className.split(" ");
                          for (var c=0;c<classes.length;c++) {
                                  var cls = classes[c];
                                  if (cls.substring(0,9) == "pixastic-") {
                                          var actionName = cls.substring(9);
                                          if (actionName != "")
                                                  actions.push(actionName);
                                  }
                          }
                          if (actions.length) {
                                  if (el.tagName.toLowerCase() == "img") {
                                          var dataImg = new Image();
                                          dataImg.src = el.src;
                                          if (dataImg.complete) {
                                                  for (var a=0;a<actions.length;a++) {
                                                          var res = Pixastic.applyAction(el, el, actions[a], null);
                                                          if (res) 
                                                                  el = res;
                                                  }
                                          } else {
                                                  dataImg.onload = function() {
                                                          for (var a=0;a<actions.length;a++) {
                                                                  var res = Pixastic.applyAction(el, el, actions[a], null)
                                                                  if (res) 
                                                                          el = res;
                                                          }
                                                  }
                                          }
                                  } else {
                                          setTimeout(function() {
                                                  for (var a=0;a<actions.length;a++) {
                                                          var res = Pixastic.applyAction(
                                                                  el, el, actions[a], null
                                                          );
                                                          if (res) 
                                                                  el = res;
                                                  }
                                          },1);
                                  }
                          }
  
                          })();
                  }
          }
  
          onready(init);
  
          // getElementsByClass by Dustin Diaz, http://www.dustindiaz.com/getelementsbyclass/
  	function getElementsByClass(searchClass,node,tag) {
                  var classElements = new Array();
                  if ( node == null )
                          node = document;
                  if ( tag == null )
                          tag = '*';
  
                  var els = node.getElementsByTagName(tag);
                  var elsLen = els.length;
                  var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|};
  
                          var imageIsCanvas = (img.tagName.toLowerCase() == "canvas");
                          if (imageIsCanvas && Pixastic.Client.isIE()) {
                                  if (Pixastic.debug) writeDebug("Tried to process a canvas element but browser is IE.");
                                  return false;
                          }
  
                          var canvas, ctx;
                          if (Pixastic.Client.hasCanvas()) {
                                  canvas = document.createElement("canvas");
                                  ctx = canvas.getContext("2d");
                          }
  
                          var w = parseInt(img.offsetWidth);
                          var h = parseInt(img.offsetHeight);
  
                          if (actionName.indexOf("(") > -1) {
                                  var tmp = actionName;
                                  actionName = tmp.substr(0, tmp.indexOf("("));
                                  var arg = tmp.match(/\((.*?)\)/);
                                  if (arg[1]) {
                                          arg = arg[1].split(";");
                                          for (var a=0;a<arg.length;a++) {
                                                  thisArg = arg[a].split("=");
                                                  if (thisArg.length == 2) {
                                                          if (thisArg[0] == "rect") {
                                                                  var rectVal = thisArg[1].split(",");
                                                                  options[thisArg[0]] = {
                                                                          left : parseInt(rectVal[0],10)||0,
                                                                          top : parseInt(rectVal[1],10)||0,
                                                                          width : parseInt(rectVal[2],10)||0,
                                                                          height : parseInt(rectVal[3],10)||0
                                                                  }
                                                          } else {
                                                                  options[thisArg[0]] = thisArg[1];
                                                          }
                                                  }
                                          }
                                  }
                          }
  
                          if (!options.rect) {
                                  options.rect = {
                                          left : 0, top : 0, width : w, height : h
                                  };
                          }
                          var validAction = false;
                          if (Pixastic.Actions[actionName] && typeof Pixastic.Actions[actionName].process == "function") {
                                  validAction = true;
                          }
                          if (!validAction) {
                                  if (Pixastic.debug) writeDebug("Invalid action \"" + actionName + "\". Maybe file not included?");
                                  return false;
                          }
                          if (!Pixastic.Actions[actionName].checkSupport()) {
                                  if (Pixastic.debug) writeDebug("Action \"" + actionName + "\" not supported by this browser.");
                                  return false;
                          }
  
                          if (Pixastic.Client.hasCanvas()) {
                                  canvas.width = w;
                                  canvas.height = h;
                                  canvas.style.width = w+"px";
                                  canvas.style.height = h+"px";
                                  ctx.drawImage(dataImg,0,0,w,h);
  
                                  if (!img.__pixastic_org_image) {
                                          canvas.__pixastic_org_image = img;
                                          canvas.__pixastic_org_width = w;
                                          canvas.__pixastic_org_height = h;
                                  } else {
                                          canvas.__pixastic_org_image = img.__pixastic_org_image;
                                          canvas.__pixastic_org_width = img.__pixastic_org_width;
                                          canvas.__pixastic_org_height = img.__pixastic_org_height;
                                  }
  
                          } else if (Pixastic.Client.isIE() && typeof img.__pixastic_org_style == "undefined") {
                                  img.__pixastic_org_style = img.style.cssText;
                          }
  
                          var params = {
                                  image : img,
                                  canvas : canvas,
                                  width : w,
                                  height : h,
                                  useData : true,
                                  options : options
                          }
  
                          // Ok, let's do it!
  
                          var res = Pixastic.Actions[actionName].process(params);
  
                          if (!res) {
                                  return false;
                          }
  
                          if (Pixastic.Client.hasCanvas()) {
                                  if (params.useData) {
                                          if (Pixastic.Client.hasCanvasImageData()) {
                                                  canvas.getContext("2d").putImageData(params.canvasData, options.rect.left, options.rect.top);
  
                                                  // Opera doesn't seem to update the canvas until we draw something on it, lets draw a 0x0 rectangle.
                                                  canvas.getContext("2d").fillRect(0,0,0,0);
                                          }
                                  }
  
                                  if (!options.leaveDOM) {
                                          // copy properties and stuff from the source image
                                          canvas.title = img.title;
                                          canvas.imgsrc = img.imgsrc;
                                          if (!imageIsCanvas) canvas.alt  = img.alt;
                                          if (!imageIsCanvas) canvas.imgsrc = img.src;
                                          canvas.className = img.className;
                                          canvas.style.cssText = img.style.cssText;
                                          canvas.name = img.name;
                                          canvas.tabIndex = img.tabIndex;
                                          canvas.id = img.id;
                                          if (img.parentNode && img.parentNode.replaceChild) {
                                                  img.parentNode.replaceChild(canvas, img);
                                          }
                                  }
  
                                  options.resultCanvas = canvas;
  
                                  return canvas;
                          }
  
                          return img;
                  },
  
                  prepareData : function(params, getCopy) {
                          var ctx = params.canvas.getContext("2d");
                          var rect = params.options.rect;
                          var dataDesc = ctx.getImageData(rect.left, rect.top, rect.width, rect.height);
                          var data = dataDesc.data;
                          if (!getCopy) params.canvasData = dataDesc;
                          return data;
                  },
  
                  // load the image file
                  process : function(img, actionName, options, callback)
                  {
                          if (img.tagName.toLowerCase() == "img") {
                                  var dataImg = new Image();
                                  dataImg.src = img.src;
                                  if (dataImg.complete) {
                                          var res = Pixastic.applyAction(img, dataImg, actionName, options);
                                          if (callback) callback(res);
                                          return res;
                                  } else {
                                          dataImg.onload = function() {
                                                  var res = Pixastic.applyAction(img, dataImg, actionName, options)
                                                  if (callback) callback(res);
                                          }
                                  }
                          }
                          if (img.tagName.toLowerCase() == "canvas") {
                                  var res = Pixastic.applyAction(img, img, actionName, options);
                                  if (callback) callback(res);
                                  return res;
                          }
                  },
  
                  revert : function(img) {
                          if (Pixastic.Client.hasCanvas()) {
                                  if (img.tagName.toLowerCase() == "canvas" && img.__pixastic_org_image) {
                                          img.width = img.__pixastic_org_width;
                                          img.height = img.__pixastic_org_height;
                                          img.getContext("2d").drawImage(img.__pixastic_org_image, 0, 0);
  
                                          if (img.parentNode && img.parentNode.replaceChild) {
                                                  img.parentNode.replaceChild(img.__pixastic_org_image, img);
                                          }
  
                                          return img;
                                  }
                          } else if (Pixastic.Client.isIE() && typeof img.__pixastic_org_style != "undefined") {
                                  img.style.cssText = img.__pixastic_org_style;
                          }
                  },
  
                  Client : {
                          hasCanvas : (function() {
                                  var c = document.createElement("canvas");
                                  var val = false;
                                  try {
                                          val = !!((typeof c.getContext == "function") && c.getContext("2d"));
                                  } catch(e) {}
                                  return function() {
                                          return val;
                                  }
                          })(),
  
                          hasCanvasImageData : (function() {
                                  var c = document.createElement("canvas");
                                  var val = false;
                                  var ctx;
                                  try {
                                          if (typeof c.getContext == "function" && (ctx = c.getContext("2d"))) {
                                                  val = (typeof ctx.getImageData == "function");
                                          }
                                  } catch(e) {}
                                  return function() {
                                          return val;
                                  }
                          })(),
  
                          isIE : function() {
                                  return !!document.all && !!window.attachEvent && !window.opera;
                          }
                  },
  
                  Actions : {}
          }
  
  })();