/* Pushup
 * Copyright (c) 2008 Nick Stakenburg (www.nickstakenburg.com)
 *
 * License: MIT-style license.
 * Website: http://www.pushuptheweb.com
 *
 */

var Pushup = {
  Version: '1.0.3',
  options: {
    appearDelay: .1,
    fadeDelay: 1200,
    images: '../images/pushup/',
    message: 'SA Business has detected you are using an out-of-date browser. The website will not be displayed correctly in this browser. Numerous security issues have been found with your browser. It is recommended you upgrade your browser to ensure sensitive information is not taken advantage of. Click here to download the latest version of your browser.',
    reminder: {
      hours: 0.5,
      message: 'Remove'
    },
    skip: true
  },
  updateLinks: {
    IE: 'http://www.microsoft.com/windows/downloads/ie/',
    Firefox: 'http://www.getfirefox.com',
    Safari: 'http://www.apple.com/safari/download/',
    Opera: 'http://www.opera.com/download/'
  },
  Browser: {
    IE: !!(window.attachEvent &&
      navigator.userAgent.indexOf('Opera') === -1),
    Firefox: navigator.userAgent.indexOf('Firefox') > -1,
    Safari: navigator.userAgent.indexOf('AppleWebKit/') > -1 &&
      /Apple/.test(navigator.vendor),
    Opera: navigator.userAgent.indexOf('Opera') > -1
  }
};

Pushup.conditions = {
  IE: (function(agent) {
    var version = /MSIE ([\d.]+)/.exec(agent);
    return version && parseFloat(version[1]) < 7;
  })(navigator.userAgent),
  Firefox: Pushup.Browser.Firefox &&
    parseFloat(navigator.userAgent.match(/Firefox[\/\s](\d+)/)[1]) < 3,
  Safari: Pushup.Browser.Safari &&
    parseFloat(navigator.userAgent.match(/AppleWebKit\/(\d+)/)[1]) < 500,
  Opera: Pushup.Browser.Opera && (!window.opera.version ||
    parseFloat(window.opera.version()) < 9.5)
};

(function() {
// find current browser and check if it needs an update
for (var browser in Pushup.Browser)
  if (Pushup.Browser[browser]) Pushup._browserUsed = browser;
Pushup._updateBrowser = Pushup.conditions[Pushup._browserUsed] &&
  Pushup._browserUsed;

// stop if no update is required and we want to skip build
if (!Pushup._updateBrowser && Pushup.options.skip) return;

function Extend(destination, source) {
  for (var property in source)
    destination[property] = source[property];
  return destination;
}

Extend(Pushup, {
  start: function() {
    // get the image directory
    if (/^(https?:\/\/|\/)/.test(this.options.images))
      this.images = this.options.images;
    else {
      var srcMatch = /pushup(?:-[\w\d.]+)?\.js(.*)/,
       scripts = document.getElementsByTagName('script');
      for (var i = 0, l = scripts.length; i < l; i++) {
        var s = scripts[i];
        if (s.src && s.src.match(srcMatch))
          this.images = s.src.replace(srcMatch, '') + this.options.images;
      }
    }
    if (Pushup._updateBrowser) this.show();
  },

  build: function() {
    this.pushup = document.createElement('div');
    Opacity.set(this.pushup, 0);
    this.pushup.id = 'pushup';

    this.messageLink = this.pushup.appendChild(document.createElement('a'));
    this.messageLink.className = 'pushup_messageLink';
    this.messageLink.target = '_blank';

    this.messageLink.appendChild(this.icon = document.createElement('div'));
    this.icon.className = 'pushup_icon';

    this.messageLink.appendChild(this.message = document.createElement('span'));
    this.message.className = 'pushup_message';
    this.message.innerHTML = this.options.message;

    // reminder message if cookies are enabled
    var hours = this.options.reminder.hours;
    if (hours && Pushup.cookiesEnabled) {
      this.pushup.appendChild(this.reminder = document.createElement('a'));
      this.reminder.href = '#';
      this.reminder.className = 'pushup_reminder';
      this.pushup.className = 'withReminder';
      var H = hours + ' hour' + (hours > 1 ? 's' : ''),
       message = this.options.reminder.message.replace('#{hours}', H);
      this.reminder.innerHTML = message;
    }

    // Older Opera doesn't handle float correctly
    if (Pushup.Browser.Opera &&
       (!window.opera.version || parseFloat(window.opera.version()) < 9.25)) {
      this.messageLink.style.cssFloat = 'none';
      this.reminder.style.cssFloat = 'none';
    }

    Pushup.setBrowser(Pushup._updateBrowser);
    document.body.appendChild(this.pushup);
    Pushup.addEvents();
  },

  addEvents: function() {
    if (this.reminder) {
      Event.add(this.reminder, 'click', function(event) {
        Event.stop(event);
        Pushup.setReminder(Pushup.options.reminder.hours);
        Pushup.fade();
      });
    }
    Event.add(this.pushup, 'mouseover', Pushup.clearFade);
    Event.add(this.pushup, 'mouseout', function() {
      Pushup.fade({ delay: Pushup.options.fadeDelay })
    });
  },

  setBrowser: function(browser) {
    browser = browser || 'IE';
    setPngBackground(this.icon, this.images + browser.toLowerCase() + '.png');
    this.messageLink.href = this.updateLinks[browser];
  },

  show: function() {
    // default to IE if no browser was detected
    var browser = typeof arguments[0] == 'string' ?
      arguments[0] : Pushup._browserUsed || 'IE',
     options = arguments[browser ? 1 : 0] || {};

    if (options.resetReminder) Pushup.resetReminder();

    // show if not blocked by cookie
    if (!options.ignoreReminder && Pushup.cookiesEnabled &&
      Cookie.get('_pushupBlocked')) return;

    if (!Pushup.pushup) Pushup.build();
    Opacity.set(Pushup.pushup, 0);
    Pushup.pushup.style.display = 'block';
    if (browser) Pushup.setBrowser(browser);
    this.appear({ fadeAfter: true, delay: Pushup.options.appearDelay });
  },

  appear: function(delay) {
    Pushup.clearFade();
    var options = arguments[0] || {};
    return window.setTimeout(function() {
      Appear(Pushup.pushup, { afterFinish: function() {
        if (options.fadeAfter)
          Pushup.fade({ delay: Pushup.options.fadeDelay });
      }});
    }, (options.delay || 0.01) * 1000);
  },

  clearFade: function() {
    if (Pushup._fadeTimer) {
      window.clearTimeout(Pushup._fadeTimer);
      Pushup._fadeTimer = null;
    }
  },

  fade: function() {
    var options = arguments[0] || {};
    Pushup._fadeTimer = window.setTimeout(function() {
      Fade(Pushup.pushup);
    }, (options.delay || 0.01) * 1000);
  },

  setReminder: function(hours) {
    Cookie.set('_pushupBlocked', 'blocked', { duration: 1 / 24 * hours })
  },

  resetReminder: function() { Cookie.remove('_pushupBlocked') }
});

// Opacity adapted from the Prototype JavaScript framework
// http://www.prototypejs.org
var Opacity = {
  set: function(element, value) {
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;
  },

  get:  function(element) {
    var opacity = element.style.opacity;
    return opacity ? parseFloat(opacity) : 1.0;
  }
};

if (Pushup.Browser.IE) {
  Opacity.get = function(element) {
    var opacity = element.style.opacity;
    if (!opacity && element.currentStyle) opacity = element.currentStyle[opacity];

    if (opacity = (element.style.filter || '').match(/alpha\(opacity=(.*)\)/))
      if (opacity[1]) return parseFloat(opacity[1]) / 100;
    return 1.0;
  };

  Opacity.set = function(element, value) {
    function stripAlpha(filter) {
      return filter.replace(/alpha\([^\)]*\)/gi,'')
    }
    var currentStyle = element.currentStyle;
    if ((currentStyle && !currentStyle.hasLayout) ||
      (!currentStyle && element.style.zoom == 'normal'))
        element.style.zoom = 1;
    var filter = element.style.filter,
     style = element.style;
    if (value == 1 || value === '') (filter = stripAlpha(filter)) ?
      style.filter = filter : style.filter = '';
    else style.filter = stripAlpha(filter) +
      'alpha(opacity=' + (value * 100) + ')';
  };
}

function Appear(element) {
  var current = Opacity.get(element),
   options = arguments[1] || {};
  if (element.style.display != 'block')
    element.style.display = 'block';
  if (current < 1) {
    setTimeout(function() {
      Opacity.set(element, current += 0.05);
      Appear(element, options);
    }, 0.01);
  }
  else {
    if (Pushup.Browser.IE && element.style.filter)
      element.style.removeAttribute('filter');
    if (options.afterFinish) options.afterFinish.call();
  }
}

function Fade(element) {
  var current = Opacity.get(element),
   options = arguments[1] || {};
  if (current > 0) {
    setTimeout(function() {
      Opacity.set(element, current -= 0.05);
      Fade(element, options);
    }, 0.01);
  }
  else {
    element.style.display = 'none';
    if (options.afterFinish) options.afterFinish.call();
  }
}

function setPngBackground(element, url) {
  var options = Extend({
    align: 'top left',
    repeat: 'no-repeat',
    sizingMethod: 'crop',
    backgroundColor: ''
  }, arguments[2] || {});

  Extend(element.style, arguments.callee.IEBelow7 ? {
    filter: 'progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'' +
      url + '\'\', sizingMethod=\'' + options.sizingMethod + '\')'
  } : {
    background: options.backgroundColor + ' url(' + url + ') ' +
      options.align + ' ' + options.repeat
  });
}
setPngBackground.IEBelow7 = Pushup.Browser.IE &&
  parseFloat(/MSIE ([\d.]+)/.exec(navigator.userAgent)[1]) < 7;

// Based on the work of Peter-Paul Koch - http://www.quirksmode.org
var Cookie = {
  set: function(name, value) {
    var expires = '', options = arguments[2] || {};
    if (options.duration) {
      var date = new Date();
      date.setTime(date.getTime() + options.duration * 1000 * 60 * 60 * 24);
      value += '; expires=' + date.toGMTString();
    }
    document.cookie = name + "=" + value + expires + "; path=/";
  },

  remove: function(name) { this.set(name, '', -1) },

  get: function(name) {
    var cookies = document.cookie.split(';'), nameEQ = name + "=";
    for (var i = 0, l = cookies.length; i < l; i++) {
      var c = cookies[i];
      while (c.charAt(0) == ' ')
        c = c.substring(1,c.length);
      if (c.indexOf(nameEQ) == 0)
        return c.substring(nameEQ.length, c.length);
    }
    return null;
  }
};

// check if cookies are enabled
Pushup.cookiesEnabled = (function(test) {
  if (Cookie.get(test)) return true;
  Cookie.set(test, 'test', { duration: 15 });
  return Cookie.get(test);
})('_pushupCookiesEnabled');

var Event = {
  add: function(obj, type, fn) {
    if (obj.attachEvent) {
      obj['e' + type + fn] = fn;
      obj[type + fn] = function(){ obj['e' + type +fn](window.event) };
      obj.attachEvent('on' + type, obj[type + fn]);
    }
    else obj.addEventListener(type, fn, false);
  },

  stop: function(event) {
    if (Pushup.Browser.IE) {
      event.cancelBubble = true;
      event.returnValue = false;
    }
    else {
      event.preventDefault();
      event.stopPropagation();
    }
  }
};

Event.add(window, 'load', function() { Pushup.start() });
})();