/*
   * noVNC: HTML5 VNC client
   * Copyright (C) 2012 Joel Martin
   * Licensed under MPL 2.0 (see LICENSE.txt)
   *
   * See README.md for usage and integration instructions.
   */
  
  "use strict";
  /*jslint bitwise: false, white: false */
  /*global Util, window, document */
  
  // Globals defined here
  var WebUtil = {}, $D;
  
  /*
   * Simple DOM selector by ID
   */
  if (!window.$D) {
      window.$D = function (id) {
          if (document.getElementById) {
              return document.getElementById(id);
          } else if (document.all) {
              return document.all[id];
          } else if (document.layers) {
              return document.layers[id];
          }
          return undefined;
      };
  }
  
  
  /* 
   * ------------------------------------------------------
   * Namespaced in WebUtil
   * ------------------------------------------------------
   */
  
  // init log level reading the logging HTTP param
  WebUtil.init_logging = function(level) {
      if (typeof level !== "undefined") {
          Util._log_level = level;
      } else {
          Util._log_level = (document.location.href.match(
              /logging=([A-Za-z0-9\._\-]*)/) ||
              ['', Util._log_level])[1];
      }
      Util.init_logging();
  };
  
  
  WebUtil.dirObj = function (obj, depth, parent) {
      var i, msg = "", val = "";
      if (! depth) { depth=2; }
      if (! parent) { parent= ""; }
  
      // Print the properties of the passed-in object 
      for (i in obj) {
          if ((depth > 1) && (typeof obj[i] === "object")) { 
              // Recurse attributes that are objects
              msg += WebUtil.dirObj(obj[i], depth-1, parent + "." + i);
          } else {
              //val = new String(obj[i]).replace("
  ", " ");
              if (typeof(obj[i]) === "undefined") {
                  val = "undefined";
              } else {
                  val = obj[i].toString().replace("
  ", " ");
              }
              if (val.length > 30) {
                  val = val.substr(0,30) + "...";
              } 
              msg += parent + "." + i + ": " + val + "
  ";
          }
      }
      return msg;
  };
  
  // Read a query string variable
  WebUtil.getQueryVar = function(name, defVal) {
      var re = new RegExp('[?][^#]*' + name + '=([^&#]*)'),
          match = document.location.href.match(re);
      if (typeof defVal === 'undefined') { defVal = null; }
      if (match) {
          return decodeURIComponent(match[1]);
      } else {
          return defVal;
      }
  };
  
  
  /*
   * Cookie handling. Dervied from: http://www.quirksmode.org/js/cookies.html
   */
  
  // No days means only for this browser session
  WebUtil.createCookie = function(name,value,days) {
      var date, expires;
      if (days) {
          date = new Date();
          date.setTime(date.getTime()+(days*24*60*60*1000));
          expires = "; expires="+date.toGMTString();
      }
      else {
          expires = "";
      }
      document.cookie = name+"="+value+expires+"; path=/";
  };
  
  WebUtil.readCookie = function(name, defaultValue) {
      var i, c, nameEQ = name + "=", ca = document.cookie.split(';');
      for(i=0; i < ca.length; i += 1) {
          c = ca[i];
          while (c.charAt(0) === ' ') { c = c.substring(1,c.length); }
          if (c.indexOf(nameEQ) === 0) { return c.substring(nameEQ.length,c.length); }
      }
      return (typeof defaultValue !== 'undefined') ? defaultValue : null;
  };
  
  WebUtil.eraseCookie = function(name) {
      WebUtil.createCookie(name,"",-1);
  };
  
  /*
   * Setting handling.
   */
  
  WebUtil.initSettings = function(callback) {
      var callbackArgs = Array.prototype.slice.call(arguments, 1);
      if (window.chrome && window.chrome.storage) {
          window.chrome.storage.sync.get(function (cfg) {
              WebUtil.settings = cfg;
              console.log(WebUtil.settings);
              if (callback) {
                  callback.apply(this, callbackArgs);
              }
          });
      } else {
          // No-op
          if (callback) {
              callback.apply(this, callbackArgs);
          }
      }
  };
  
  // No days means only for this browser session
  WebUtil.writeSetting = function(name, value) {
      if (window.chrome && window.chrome.storage) {
          //console.log("writeSetting:", name, value);
          if (WebUtil.settings[name] !== value) {
              WebUtil.settings[name] = value;
              window.chrome.storage.sync.set(WebUtil.settings);
          }
      } else {
          localStorage.setItem(name, value);
      }
  };
  
  WebUtil.readSetting = function(name, defaultValue) {
      var value;
      if (window.chrome && window.chrome.storage) {
          value = WebUtil.settings[name];
      } else {
          value = localStorage.getItem(name);
      }
      if (typeof value === "undefined") {
          value = null;
      }
      if (value === null && typeof defaultValue !== undefined) {
          return defaultValue;
      } else {
          return value;
      }
  };
  
  WebUtil.eraseSetting = function(name) {
      if (window.chrome && window.chrome.storage) {
          window.chrome.storage.sync.remove(name);
          delete WebUtil.settings[name];
      } else {
          localStorage.removeItem(name);
      }
  };
  
  /*
   * Alternate stylesheet selection
   */
  WebUtil.getStylesheets = function() { var i, links, sheets = [];
      links = document.getElementsByTagName("link");
      for (i = 0; i < links.length; i += 1) {
          if (links[i].title &&
              links[i].rel.toUpperCase().indexOf("STYLESHEET") > -1) {
              sheets.push(links[i]);
          }
      }
      return sheets;
  };
  
  // No sheet means try and use value from cookie, null sheet used to
  // clear all alternates.
  WebUtil.selectStylesheet = function(sheet) {
      var i, link, sheets = WebUtil.getStylesheets();
      if (typeof sheet === 'undefined') {
          sheet = 'default';
      }
      for (i=0; i < sheets.length; i += 1) {
          link = sheets[i];
          if (link.title === sheet) {    
              Util.Debug("Using stylesheet " + sheet);
              link.disabled = false;
          } else {
              //Util.Debug("Skipping stylesheet " + link.title);
              link.disabled = true;
          }
      }
      return sheet;
  };