(function($){
Drupal.behaviors.contextReactionBlock = {attach: function(context) {
  $('form.context-editor:not(.context-block-processed)')
    .addClass('context-block-processed')
    .each(function() {
      var id = $(this).attr('id');
      Drupal.contextBlockEditor = Drupal.contextBlockEditor || {};
      $(this).bind('init.pageEditor', function(event) {
        Drupal.contextBlockEditor[id] = new DrupalContextBlockEditor($(this));
      });
      $(this).bind('start.pageEditor', function(event, context) {
        // Fallback to first context if param is empty.
        if (!context) {
          context = $(this).data('defaultContext');
        }
        Drupal.contextBlockEditor[id].editStart($(this), context);
      });
      $(this).bind('end.pageEditor', function(event) {
        Drupal.contextBlockEditor[id].editFinish();
      });
    });

  //
  // Admin Form =======================================================
  //
  // ContextBlockForm: Init.
  $('#context-blockform:not(.processed)').each(function() {
    $(this).addClass('processed');
    Drupal.contextBlockForm = new DrupalContextBlockForm($(this));
    Drupal.contextBlockForm.setState();
  });

  // ContextBlockForm: Attach block removal handlers.
  // Lives in behaviors as it may be required for attachment to new DOM elements.
  $('#context-blockform a.remove:not(.processed)').each(function() {
    $(this).addClass('processed');
    $(this).click(function() {
      $(this).parents('tr').eq(0).remove();
      Drupal.contextBlockForm.setState();
      return false;
    });
  });

  // Conceal Section title, subtitle and class
  $('div.context-block-browser', context).nextAll('.form-item').hide();
}};

/**
 * Context block form. Default form for editing context block reactions.
 */
DrupalContextBlockForm = function(blockForm) {
  this.state = {};

  this.setState = function() {
    $('table.context-blockform-region', blockForm).each(function() {
      var region = $(this).attr('id').split('context-blockform-region-')[1];
      var blocks = [];
      $('tr', $(this)).each(function() {
        var bid = $(this).attr('id');
        var weight = $(this).find('select,input').first().val();
        blocks.push({'bid' : bid, 'weight' : weight});
      });
      Drupal.contextBlockForm.state[region] = blocks;
    });

    // Serialize here and set form element value.
    $('form input.context-blockform-state').val(JSON.stringify(this.state));

    // Hide enabled blocks from selector that are used
    $('table.context-blockform-region tr').each(function() {
      var bid = $(this).attr('id');
      $('div.context-blockform-selector input[value="'+bid+'"]').parents('div.form-item').eq(0).hide();
    });
    // Show blocks in selector that are unused
    $('div.context-blockform-selector input').each(function() {
      var bid = $(this).val();
      if ($('table.context-blockform-region tr#'+bid).size() === 0) {
        $(this).parents('div.form-item').eq(0).show();
      }
    });

  };

  // make sure we update the state right before submits, this takes care of an
  // apparent race condition between saving the state and the weights getting set
  // by tabledrag
  $('#ctools-export-ui-edit-item-form').submit(function() { Drupal.contextBlockForm.setState(); });

  // Tabledrag
  // Add additional handlers to update our blocks.
  $.each(Drupal.settings.tableDrag, function(base) {
    var table = $('#' + base + ':not(.processed)', blockForm);
    if (table && table.is('.context-blockform-region')) {
      table.addClass('processed');
      table.bind('mouseup', function(event) {
        Drupal.contextBlockForm.setState();
        return;
      });
    }
  });

  // Add blocks to a region
  $('td.blocks a', blockForm).each(function() {
    $(this).click(function() {
      var region = $(this).attr('href').split('#')[1];
      var base = "context-blockform-region-"+ region;
      var selected = $("div.context-blockform-selector input:checked");
      if (selected.size() > 0) {
        var weight_warn = false;
        var min_weight_option = -10;
        var max_weight_option = 10;
        var max_observed_weight = min_weight_option - 1;
        $('table#' + base + ' tr').each(function() {
          var weight_input_val = $(this).find('select,input').first().val();
          if (+weight_input_val > +max_observed_weight) {
            max_observed_weight = weight_input_val;
          }
        });

        selected.each(function() {
          // create new block markup
          var block = document.createElement('tr');
          var text = $(this).parents('div.form-item').eq(0).hide().children('label').text();
          var select = '<div class="form-item form-type-select"><select class="tabledrag-hide form-select">';
          var i;
          weight_warn = true;
          var selected_weight = max_weight_option;
          if (max_weight_option >= (1 + +max_observed_weight)) {
            selected_weight = ++max_observed_weight;
            weight_warn = false;
          }

          for (i = min_weight_option; i <= max_weight_option; ++i) {
            select += '<option';
            if (i == selected_weight) {
              select += ' selected=selected';
            }
            select += '>' + i + '</option>';
          }
          select += '</select></div>';
          $(block).attr('id', $(this).attr('value')).addClass('draggable');
          $(block).html("<td>"+ text + "</td><td>" + select + "</td><td><a href='' class='remove'>X</a></td>");

          // add block item to region
          //TODO : Fix it so long blocks don't get stuck when added to top regions and dragged towards bottom regions
          Drupal.tableDrag[base].makeDraggable(block);
          $('table#'+base).append(block);
          if ($.cookie('Drupal.tableDrag.showWeight') == 1) {
            $('table#'+base).find('.tabledrag-hide').css('display', '');
            $('table#'+base).find('.tabledrag-handle').css('display', 'none');
          }
          else {
            $('table#'+base).find('.tabledrag-hide').css('display', 'none');
            $('table#'+base).find('.tabledrag-handle').css('display', '');
          }
          Drupal.attachBehaviors($('table#'+base));

          Drupal.contextBlockForm.setState();
          $(this).removeAttr('checked');
        });
        if (weight_warn) {
          alert(Drupal.t('Desired block weight exceeds available weight options, please check weights for blocks before saving.'));
        }
      }
      return false;
    });
  });
};

/**
 * Context block editor. AHAH editor for live block reaction editing.
 */
DrupalContextBlockEditor = function(editor) {
  this.editor = editor;
  this.state = {};
  this.blocks = {};
  this.regions = {};

  return this;
};

DrupalContextBlockEditor.prototype = {
  initBlocks : function(blocks) {
    var self = this;
    this.blocks = blocks;
    blocks.each(function() {
      if($(this).hasClass('context-block-empty')) {
        $(this).removeClass('context-block-hidden');
      }
      $(this).addClass('draggable');
      $(this).prepend($('<a class="context-block-handle"></a>'));
      $(this).prepend($('<a class="context-block-remove"></a>').click(function() {
        $(this).parent ('.block').eq(0).fadeOut('medium', function() {
          $(this).remove();
          self.updateBlocks();
        });
        return false;
      }));
    });
  },
  initRegions : function(regions) {
    this.regions = regions;
    var ref = this;

    $(regions).not('.context-ui-processed')
      .each(function(index, el) {
        $('.context-ui-add-link', el).click(function(e){
          ref.showBlockBrowser($(this).parent());
        }).addClass('context-ui-processed');
      });
    $('.context-block-browser').hide();
  },
  showBlockBrowser : function(region) {
    var toggled = false;
    //figure out the id of the context
    var activeId = $('.context-editing', this.editor).attr('id').replace('-trigger', ''),
    context = $('#' + activeId)[0];

    this.browser = $('.context-block-browser', context).addClass('active');

    //add the filter element to the block browser
    if (!this.browser.has('input.filter').size()) {
      var parent = $('.block-browser-sidebar .filter', this.browser);
      var list = $('.blocks', this.browser);
      new Drupal.Filter (list, false, '.context-block-addable', parent);
    }
    //show a dialog for the blocks list
    this.browser.show().dialog({
      modal : true,
      close : function() {
        $(this).dialog('destroy');
        //reshow all the categories
        $('.category', this).show();
        $(this).hide().appendTo(context).removeClass('active');
      },
      height: (.8 * $(window).height()),
      minHeight:400,
      minWidth:680,
      width:680
    });

    //handle showing / hiding block items when a different category is selected
    $('.context-block-browser-categories', this.browser).change(function(e) {
      //if no category is selected we want to show all the items
      if ($(this).val() == 0) {
        $('.category', self.browser).show();
      } else {
        $('.category', self.browser).hide();
        $('.category-' + $(this).val(), self.browser).show();
      }
    });

    //if we already have the function for a different context, rebind it so we don't get dupes
    if(this.addToRegion) {
      $('.context-block-addable', this.browser).unbind('click.addToRegion')
    }

    //protected function for adding a clicked block to a region
    var self = this;
    this.addToRegion = function(e){
      var ui = {
        'item' : $(this).clone(),
        'sender' : $(region)
      };
      $(this).parents('.context-block-browser.active').dialog('close');
      $(region).after(ui.item);
      self.addBlock(e, ui, this.editor, activeId.replace('context-editable-', ''));
    };

    $('.context-block-addable', this.browser).bind('click.addToRegion', this.addToRegion);
  },
  // Update UI to match the current block states.
  updateBlocks : function() {
    var browser = $('div.context-block-browser');

    // For all enabled blocks, mark corresponding addables as having been added.
    $('.block, .admin-block').each(function() {
      var bid = $(this).attr('id').split('block-')[1]; // Ugh.
    });
    // For all hidden addables with no corresponding blocks, mark as addable.
    $('.context-block-item', browser).each(function() {
      var bid = $(this).attr('id').split('context-block-addable-')[1];
    });

    // Mark empty regions.
    $(this.regions).each(function() {
      if ($('.block:has(a.context-block)', this).size() > 0) {
        $(this).removeClass('context-block-region-empty');
      }
      else {
        $(this).addClass('context-block-region-empty');
      }
    });
  },
  // Live update a region
  updateRegion : function(event, ui, region, op) {
    switch (op) {
      case 'over':
        $(region).removeClass('context-block-region-empty');
        break;
      case 'out':
        if (
          // jQuery UI 1.8
          $('.draggable-placeholder', region).size() === 1 &&
          $('.block:has(a.context-block)', region).size() == 0
        ) {
          $(region).addClass('context-block-region-empty');
        }
        break;
    }
  },
  // Remove script elements while dragging & dropping.
  scriptFix : function(event, ui, editor, context) {
    if ($('script', ui.item)) {
      var placeholder = $(Drupal.settings.contextBlockEditor.scriptPlaceholder);
      var label = $('div.handle label', ui.item).text();
      placeholder.children('strong').html(label);
      $('script', ui.item).parent().empty().append(placeholder);
    }
  },
  // Add a block to a region through an AJAX load of the block contents.
  addBlock : function(event, ui, editor, context) {
    var self = this;
    if (ui.item.is('.context-block-addable')) {
      var bid = ui.item.attr('id').split('context-block-addable-')[1];

      // Construct query params for our AJAX block request.
      var params = Drupal.settings.contextBlockEditor.params;
      params.context_block = bid + ',' + context;

      // Replace item with loading block.
      //ui.sender.append(ui.item);

      var blockLoading = $('<div class="context-block-item context-block-loading"><span class="icon"></span></div>');
      ui.item.addClass('context-block-added');
      ui.item.after(blockLoading);


      $.getJSON(Drupal.settings.contextBlockEditor.path, params, function(data) {
        if (data.status) {
          var newBlock = $(data.block);
          if ($('script', newBlock)) {
            $('script', newBlock).remove();
          }
          blockLoading.fadeOut(function() {
            $(this).replaceWith(newBlock);
            self.initBlocks(newBlock);
            self.updateBlocks();
            Drupal.attachBehaviors(newBlock);
          });
        }
        else {
          blockLoading.fadeOut(function() { $(this).remove(); });
        }
      });
    }
    else if (ui.item.is(':has(a.context-block)')) {
      self.updateBlocks();
    }
  },
  // Update form hidden field with JSON representation of current block visibility states.
  setState : function() {
    var self = this;

    $(this.regions).each(function() {
      var region = $('.context-block-region', this).attr('id').split('context-block-region-')[1];
      var blocks = [];
      $('a.context-block', $(this)).each(function() {
        if ($(this).attr('class').indexOf('edit-') != -1) {
          var bid = $(this).attr('id').split('context-block-')[1];
          var context = $(this).attr('class').split('edit-')[1].split(' ')[0];
          context = context ? context : 0;
          var block = {'bid': bid, 'context': context};
          blocks.push(block);
        }
      });
      self.state[region] = blocks;
    });
    // Serialize here and set form element value.
    $('input.context-block-editor-state', this.editor).val(JSON.stringify(this.state));
  },
  //Disable text selection.
  disableTextSelect : function() {
    if ($.browser.safari) {
      $('.block:has(a.context-block):not(:has(input,textarea))').css('WebkitUserSelect','none');
    }
    else if ($.browser.mozilla) {
      $('.block:has(a.context-block):not(:has(input,textarea))').css('MozUserSelect','none');
    }
    else if ($.browser.msie) {
      $('.block:has(a.context-block):not(:has(input,textarea))').bind('selectstart.contextBlockEditor', function() { return false; });
    }
    else {
      $(this).bind('mousedown.contextBlockEditor', function() { return false; });
    }
  },
  //Enable text selection.
  enableTextSelect : function() {
    if ($.browser.safari) {
      $('*').css('WebkitUserSelect','');
    }
    else if ($.browser.mozilla) {
      $('*').css('MozUserSelect','');
    }
    else if ($.browser.msie) {
      $('*').unbind('selectstart.contextBlockEditor');
    }
    else {
      $(this).unbind('mousedown.contextBlockEditor');
    }
  },
  // Start editing. Attach handlers, begin draggable/sortables.
  editStart : function(editor, context) {
    var self = this;
    // This is redundant to the start handler found in context_ui.js.
    // However it's necessary that we trigger this class addition before
    // we call .sortable() as the empty regions need to be visible.
    $(document.body).addClass('context-editing');
    this.editor.addClass('context-editing');
    this.disableTextSelect();
    this.initBlocks($('.block:has(a.context-block.edit-'+context+')'));
    this.initRegions($('.context-block-region').parent());
    this.updateBlocks();

    $('a.context_ui_dialog-stop').hide();

    $('.editing-context-label').remove();
    var label = $('#context-editable-trigger-'+context+' .label').text();
    label = Drupal.t('Now editing: @label', {'@label': label});
    editor.parent().parent().prepend('<div class="editing-context-label">' + label + '</div>');

    // First pass, enable sortables on all regions.
    $(this.regions).each(function() {
      var region = $(this);
      var params = {
        revert: true,
        dropOnEmpty: true,
        placeholder: 'draggable-placeholder',
        forcePlaceholderSize: true,
        items: '> *:has(a.context-block.editable)',
        handle: 'a.context-block-handle',
        start: function(event, ui) { self.scriptFix(event, ui, editor, context); },
        stop: function(event, ui) { self.addBlock(event, ui, editor, context); },
        receive: function(event, ui) { self.addBlock(event, ui, editor, context); },
        over: function(event, ui) { self.updateRegion(event, ui, region, 'over'); },
        out: function(event, ui) { self.updateRegion(event, ui, region, 'out'); },
        cursorAt: {left: 300, top: 0}
      };
      region.sortable(params);
    });

    // Second pass, hook up all regions via connectWith to each other.
    $(this.regions).each(function() {
      $(this).sortable('option', 'connectWith', ['.ui-sortable']);
    });

    // Terrible, terrible workaround for parentoffset issue in Safari.
    // The proper fix for this issue has been committed to jQuery UI, but was
    // not included in the 1.6 release. Therefore, we do a browser agent hack
    // to ensure that Safari users are covered by the offset fix found here:
    // http://dev.jqueryui.com/changeset/2073.
    if ($.ui.version === '1.6' && $.browser.safari) {
      $.browser.mozilla = true;
    }
  },
  // Finish editing. Remove handlers.
  editFinish : function() {
    this.editor.removeClass('context-editing');
    this.enableTextSelect();

    $('.editing-context-label').remove();

    // Remove UI elements.
    $(this.blocks).each(function() {
      $('a.context-block-handle, a.context-block-remove', this).remove();
      if($(this).hasClass('context-block-empty')) {
        $(this).addClass('context-block-hidden');
      }
      $(this).removeClass('draggable');
    });

    $('a.context_ui_dialog-stop').show();

    this.regions.sortable('destroy');

    this.setState();

    // Unhack the user agent.
    if ($.ui.version === '1.6' && $.browser.safari) {
      $.browser.mozilla = false;
    }
  }
}; //End of DrupalContextBlockEditor prototype

})(jQuery);
