(function($) {
  $.skyweb = function(data, klass) {
    $.skyweb.loading()

    if (data.ajax) fillskywebFromAjax(data.ajax)
    else if (data.image) fillskywebFromImage(data.image)
    else if (data.div) fillskywebFromHref(data.div)
    else if ($.isFunction(data)) data.call($)
    else $.skyweb.reveal(data, klass)
  }

	$.extend($.skyweb, {
		settings: {
			opacity: 0.8,
			overlay: true,
			loadingImage: '/include/skyweb/loading.gif',
			closeImage: '/include/skyweb/closelabel.gif',
			imageTypes: ['png','jpg','jpeg','gif'],
			skywebHtml: '<div id="skyweb" style="display:none"><div class="popup"><div class="skyweb_content"><center><img src="/i/loading.gif"></center></div></div></div>'
		},

    loading: function() {
      init()
      if ($('#skyweb .loading').length == 1) return true
      showOverlay()

      $('#skyweb .skyweb_content').empty()
      $('#skyweb .body').children().hide().end().
        append('<div class="loading"><img src="'+$.skyweb.settings.loadingImage+'"/></div>')

      $('#skyweb').css({
        top:	getPageScroll()[1] + (getPageHeight() / 10),
        left:	385.5
      }).show()

      $(document).bind('keydown.skyweb', function(e) {
        if (e.keyCode == 27) $.skyweb.close()
        return true
      })
      $(document).trigger('loading.skyweb')
    },

    reveal: function(data, klass) {
      $(document).trigger('beforeReveal.skyweb')
      if (klass) $('#skyweb .skyweb_content').addClass(klass)
      $('#skyweb .skyweb_content').append(data)
      $('#skyweb .loading').remove()
      $('#skyweb .body').children().fadeIn('normal')
      $('#skyweb').css('left', $(window).width() / 2 - ($('#skyweb table').width() / 2))
      $(document).trigger('reveal.skyweb').trigger('afterReveal.skyweb')
    },

    close: function() {
      $(document).trigger('close.skyweb')
      return false
    }
  })

  $.fn.skyweb = function(settings) {
    init(settings)

    function clickHandler() {
      $.skyweb.loading(true)

      var klass = this.rel.match(/skyweb\[?\.(\w+)\]?/)
      if (klass) klass = klass[1]

      fillskywebFromHref(this.href, klass)
      return false
    }

    return this.click(clickHandler)
  }

  function init(settings) {
    if ($.skyweb.settings.inited) return true
    else $.skyweb.settings.inited = true

    $(document).trigger('init.skyweb')
    makeCompatible()

    var imageTypes = $.skyweb.settings.imageTypes.join('|')
    $.skyweb.settings.imageTypesRegexp = new RegExp('\.' + imageTypes + '$', 'i')

    if (settings) $.extend($.skyweb.settings, settings)
    $('body').append($.skyweb.settings.skywebHtml)

    var preload = [ new Image(), new Image() ]
    preload[0].src = $.skyweb.settings.closeImage
    preload[1].src = $.skyweb.settings.loadingImage

    $('#skyweb').find('.b:first, .bl, .br, .tl, .tr').each(function() {
      preload.push(new Image())
      preload.slice(-1).src = $(this).css('background-image').replace(/url\((.+)\)/, '$1')
    })

    $('#skyweb .close').click($.skyweb.close)
    $('#skyweb .close_image').attr('src', $.skyweb.settings.closeImage)
  }
  
  function getPageScroll() {
    var xScroll, yScroll;
    if (self.pageYOffset) {
      yScroll = self.pageYOffset;
      xScroll = self.pageXOffset;
    } else if (document.documentElement && document.documentElement.scrollTop) {	 // Explorer 6 Strict
      yScroll = document.documentElement.scrollTop;
      xScroll = document.documentElement.scrollLeft;
    } else if (document.body) {// all other Explorers
      yScroll = document.body.scrollTop;
      xScroll = document.body.scrollLeft;	
    }
    return new Array(xScroll,yScroll) 
  }

  function getPageHeight() {
    var windowHeight
    if (self.innerHeight) {	// all except Explorer
      windowHeight = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
      windowHeight = document.documentElement.clientHeight;
    } else if (document.body) { // other Explorers
      windowHeight = document.body.clientHeight;
    }	
    return windowHeight
  }

  function makeCompatible() {
    var $s = $.skyweb.settings

    $s.loadingImage = $s.loading_image || $s.loadingImage
    $s.closeImage = $s.close_image || $s.closeImage
    $s.imageTypes = $s.image_types || $s.imageTypes
    $s.skywebHtml = $s.skyweb_html || $s.skywebHtml
  }

  function fillskywebFromHref(href, klass) {
    if (href.match(/#/)) {
      var url    = window.location.href.split('#')[0]
      var target = href.replace(url,'')
      $.skyweb.reveal($(target).clone().show(), klass)

    } else if (href.match($.skyweb.settings.imageTypesRegexp)) {
      fillskywebFromImage(href, klass)
    } else {
      fillskywebFromAjax(href, klass)
    }
  }

  function fillskywebFromImage(href, klass) {
    var image = new Image()
    image.onload = function() {
      $.skyweb.reveal('<div class="image"><img src="' + image.src + '" /></div>', klass)
    }
    image.src = href
  }

  function fillskywebFromAjax(href, klass) {
    $.get(href, function(data) { $.skyweb.reveal(data, klass) })
  }

  function skipOverlay() {
    return $.skyweb.settings.overlay == false || $.skyweb.settings.opacity === null 
  }

  function showOverlay() {
    if (skipOverlay()) return

    if ($('skyweb_overlay').length == 0) 
      $("body").append('<div id="skyweb_overlay" class="skyweb_hide"></div>')

    $('#skyweb_overlay').hide().addClass("skyweb_overlayBG")
      .css('opacity', $.skyweb.settings.opacity)
      .fadeIn(200)
    return false
  }

  function hideOverlay() {
    if (skipOverlay()) return

    $('#skyweb_overlay').fadeOut(200, function(){
      $("#skyweb_overlay").removeClass("skyweb_overlayBG")
      $("#skyweb_overlay").addClass("skyweb_hide") 
      $("#skyweb_overlay").remove()
    })
    
    return false
  }

  $(document).bind('close.skyweb', function() {
    $(document).unbind('keydown.skyweb')
    $('#skyweb').fadeOut(function() {
      $('#skyweb .skyweb_content').removeClass().addClass('content')
      hideOverlay()
      $('#skyweb .loading').remove()
    })
  })

})(jQuery);