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

    if (data.ajax) fillFaceboxFromAjax(data.ajax, klass)
    else if (data.image) fillFaceboxFromImage(data.image, klass)
    else if (data.div) fillFaceboxFromHref(data.div, klass)
    else if ($.isFunction(data)) data.call($)
    else $.preview.reveal(data, klass)
  }

  /*
   * Public, $.preview methods
   */

  $.extend($.preview, {
    settings: {
      opacity      : 0,
      overlay      : true,
      loadingImage : '/preview/loading.gif',
      closeImage   : '/preview/closelabel.gif',
      imageTypes   : [ 'png', 'jpg', 'jpeg', 'gif' ],
      previewHtml  : '\
    <div id="preview" style="display:none;"> \
      <div class="popup"> \
        <table> \
          <tbody> \
            <tr> \
              <td class="tl"/><td class="b"/><td class="tr"/> \
            </tr> \
            <tr> \
              <td class="b"/> \
              <td class="body"> \
                <div class="content"> \
                </div> \
                <div class="footer"> \
                  <a href="#" class="close"> \
                    <img src="/preview/closelabel.gif" title="close" class="close_image" /> \
                  </a> \
                </div> \
              </td> \
              <td class="b"/> \
            </tr> \
            <tr> \
              <td class="bl"/><td class="b"/><td class="br"/> \
            </tr> \
          </tbody> \
        </table> \
      </div> \
    </div>'
    },

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

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

      $('#preview').css({
        top:	getPageScroll()[1] + (getPageHeight() / 10),
        left:	$(window).width() / 2 - 205 
      }).show()

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

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

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

  /*
   * Public, $.fn methods
   */

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

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

      // support for rel="preview.inline_popup" syntax, to add a class
      // also supports deprecated "preview[.inline_popup]" syntax
      var klass = this.rel.match(/preview\[?\.(\w+)\]?/)
      if (klass) klass = klass[1]

      fillFaceboxFromHref(this.href, klass)
      return false
    }

    return this.bind('click.preview', clickHandler)
  }

  /*
   * Private methods
   */

  // called one time to setup preview on this page
  function init(settings) {
    if ($.preview.settings.inited) return true
    else $.preview.settings.inited = true

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

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

    if (settings) $.extend($.preview.settings, settings)
    $('body').append($.preview.settings.previewHtml)

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

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

    $('#preview .close').click($.preview.close)
    $('#preview .close_image').attr('src', $.preview.settings.closeImage)
  }
  
  // getPageScroll() by quirksmode.com
  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) 
  }

  // Adapted from getPageSize() by quirksmode.com
  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
  }

  // Backwards compatibility
  function makeCompatible() {
    var $s = $.preview.settings

    $s.loadingImage = $s.loading_image || $s.loadingImage
    $s.closeImage = $s.close_image || $s.closeImage
    $s.imageTypes = $s.image_types || $s.imageTypes
    $s.previewHtml = $s.preview_html || $s.previewHtml
  }

  // Figures out what you want to display and displays it
  // formats are:
  //     div: #id
  //   image: blah.extension
  //    ajax: anything else
  function fillFaceboxFromHref(href, klass) {
    // div
    if (href.match(/#/)) {
      var url    = window.location.href.split('#')[0]
      var target = href.replace(url,'')
      $.preview.reveal($(target).show().replaceWith("<div id='preview_moved'></div>"), klass)

    // image
    } else if (href.match($.preview.settings.imageTypesRegexp)) {
      fillFaceboxFromImage(href, klass)
    // ajax
    } else {
      fillFaceboxFromAjax(href, klass)
    }
  }

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

  function fillFaceboxFromAjax(href, klass) {
    $.get(href, function(data) { $.preview.reveal(data, klass) })
  }

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

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

    if ($('#preview_overlay').length == 0) 
      $("body").append('<div id="preview_overlay" class="preview_hide"></div>')

    $('#preview_overlay').hide().addClass("preview_overlayBG")
      .css('opacity', $.preview.settings.opacity)
      .click(function() { $(document).trigger('close.preview') })
      .fadeIn(200)
    return false
  }

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

    $('#preview_overlay').fadeOut(200, function(){
      $("#preview_overlay").removeClass("preview_overlayBG")
      $("#preview_overlay").addClass("preview_hide") 
      $("#preview_overlay").remove()
    })
    
    return false
  }

  /*
   * Bindings
   */

  $(document).bind('close.preview', function() {
    $(document).unbind('keydown.preview')
    $('#preview').fadeOut(function() {
      if ($('#preview_moved').length == 0) $('#preview .content').removeClass().addClass('content')
      else $('#preview_moved').replaceWith($('#preview .content').children().hide())
      hideOverlay()
      $('#preview .loading').remove()
    })
  })

})(jQuery);