/*

Copyright 2010, Google Inc.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

 * Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
 * Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY           
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

SchemaAlignmentDialog.UINode = function(dialog, node, table, options) {
  this._dialog = dialog;
  this._node = node;
  this._options = options;

  if ("columnName" in this._node) {
    this._node.columnNames = [ this._node.columnName ];
    delete this._node.columnName;
  }

  this._linkUIs = [];
  this._detailsRendered = false;

  this._tr = table.insertRow(table.rows.length);
  this._tdMain = this._tr.insertCell(0);
  this._tdToggle = this._tr.insertCell(1);
  this._tdDetails = this._tr.insertCell(2);

  $(this._tdMain).addClass("schema-alignment-node-main").attr("width", "250").addClass("padded");
  $(this._tdToggle).addClass("schema-alignment-node-toggle").attr("width", "1%").addClass("padded").hide();
  $(this._tdDetails).addClass("schema-alignment-node-details").attr("width", "90%").hide();

  this._renderMain();

  this._expanded = options.expanded;
  if (this._isExpandable()) {
    this._showExpandable();
  }
};

SchemaAlignmentDialog.UINode.prototype.dispose = function() {
  // nothing for now
};

SchemaAlignmentDialog.UINode.prototype.removeLink = function(linkUI) {
  for (var i = this._linkUIs.length - 1; i >= 0; i--) {
    if (this._linkUIs[i] === linkUI) {
      this._linkUIs.splice(i, 1);
      this._node.links.splice(i, 1);
      break;
    }
  }
};

SchemaAlignmentDialog.UINode.prototype._isExpandable = function() {
  return this._node.nodeType == "cell-as-topic" ||
  this._node.nodeType == "anonymous" ||
  this._node.nodeType == "topic";
};

SchemaAlignmentDialog.UINode.prototype.render = function() {
  this._renderMain();
  if (this._isExpandable()) {
    this._showExpandable();
  } else {
    this._hideExpandable();
  }
};

SchemaAlignmentDialog.UINode.prototype.getExpectedType = function() {
  if ("type" in this._node) {
    return this._node.type.id;
  }
  return null;
};

SchemaAlignmentDialog.UINode.prototype._renderMain = function() {
  $(this._tdMain).empty();

  var self = this;
  var a = $('<a href="javascript:{}"></a>')
  .addClass("schema-alignment-node-tag")
  .appendTo(this._tdMain)
  .click(function(evt) {
    self._showNodeConfigDialog();
  });

  if (this._node.nodeType == "cell-as-topic" || 
      this._node.nodeType == "cell-as-value" || 
      this._node.nodeType == "cell-as-key") {

    if ("columnNames" in this._node) {
      for (var c = 0; c < this._node.columnNames.length; c++) {
        if (c > 0) {
          $('<span>').text(", ").appendTo(a);
        }

        $('<span>')
        .text(this._node.columnNames[c])
        .addClass("schema-alignment-node-column")
        .appendTo(a);
      }

      $('<span>').text(this._node.columnNames.length > 1 ? " cells" : " cell").appendTo(a);
    } else {
      a.html(this._options.mustBeCellTopic ? "Which column?" : "Configure...");
    }
  } else if (this._node.nodeType == "topic") {
    if ("topic" in this._node) {
      a.html(this._node.topic.name);
    } else if ("id" in this._node) {
      a.html(this._node.topic.id);
    } else {
      a.html("Which topic?");
    }
  } else if (this._node.nodeType == "value") {
    if ("value" in this._node) {
      a.html(this._node.value);
    } else {
      a.html("What value?");
    }
  } else if (this._node.nodeType == "anonymous") {
    a.html("(anonymous)");
  }
};

SchemaAlignmentDialog.UINode.prototype._showExpandable = function() {
  $(this._tdToggle).show();
  $(this._tdDetails).show();

  if (this._detailsRendered) {
    return;
  }
  this._detailsRendered = true;

  this._collapsedDetailDiv = $('<div></div>').appendTo(this._tdDetails).addClass("padded").html("...");
  this._expandedDetailDiv = $('<div></div>').appendTo(this._tdDetails).addClass("schema-alignment-detail-container");

  this._renderDetails();

  var self = this;
  var show = function() {
    if (self._expanded) {
      self._collapsedDetailDiv.hide();
      self._expandedDetailDiv.show();
    } else {
      self._collapsedDetailDiv.show();
      self._expandedDetailDiv.hide();
    }
  };
  show();

  $(this._tdToggle).html("&nbsp;");
  $('<img />')
  .attr("src", this._expanded ? "images/expanded.png" : "images/collapsed.png")
  .appendTo(this._tdToggle)
  .click(function() {
    self._expanded = !self._expanded;

    $(this).attr("src", self._expanded ? "images/expanded.png" : "images/collapsed.png");

    show();
  });
};

SchemaAlignmentDialog.UINode.prototype._hideExpandable = function() {
  $(this._tdToggle).hide();
  $(this._tdDetails).hide();
};

SchemaAlignmentDialog.UINode.prototype._renderDetails = function() {
  var self = this;

  this._tableLinks = $('<table></table>').addClass("schema-alignment-table-layout").appendTo(this._expandedDetailDiv)[0];

  if ("links" in this._node && this._node.links !== null) {
    for (var i = 0; i < this._node.links.length; i++) {
      this._linkUIs.push(new SchemaAlignmentDialog.UILink(
          this._dialog, 
          this._node.links[i], 
          this._tableLinks, 
          { expanded: true }, 
          this
      ));
    }
  }

  var divFooter = $('<div></div>').addClass("padded").appendTo(this._expandedDetailDiv);

  $('<a href="javascript:{}"></a>')
  .addClass("action")
  .text("add property")
  .appendTo(divFooter)
  .click(function() {
    var newLink = {
        property: null,
        target: {
          nodeType: "cell-as-value"
        }
    };
    self._linkUIs.push(new SchemaAlignmentDialog.UILink(
      self._dialog,
      newLink, 
      self._tableLinks,
      {
        expanded: true,
        mustBeCellTopic: false
      },
      self
    ));
  });
};

SchemaAlignmentDialog.UINode.prototype._showColumnPopupMenu = function(elmt) {
  self = this;

  var menu = [];

  if (!this._options.mustBeCellTopic) {
    menu.push({
      label: "Anonymous Node",
      click: function() {
        self._node.nodeType = "anonymous";
        self._showExpandable();
        self._renderMain();
      }
    });
    menu.push({
      label: "Freebase Topic",
      click: function() {
        self._node.nodeType = "topic";
        self._hideExpandable();
        self._renderMain();
      }
    });
    menu.push({
      label: "Value",
      click: function() {
        self._node.nodeType = "value";
        self._hideExpandable();
        self._renderMain();
      }
    });
    menu.push({}); // separator
  }

  var columns = theProject.columnModel.columns;
  var createColumnMenuItem = function(index) {
    menu.push({
      label: columns[index].name,
      click: function() {
        self._node.nodeType = "cell-as-topic";
        self._node.columnNames = [ columns[index].name ];
        self._showExpandable();
        self._renderMain();
      }
    });
  };
  for (var i = 0; i < columns.length; i++) {
    createColumnMenuItem(i);
  }

  MenuSystem.createAndShowStandardMenu(menu, elmt);
};

SchemaAlignmentDialog.UINode.prototype._showNodeConfigDialog = function() {
  var self = this;
  var frame = DialogSystem.createDialog();

  frame.width("750px");

  var header = $('<div></div>').addClass("dialog-header").text("Schema Alignment Skeleton Node").appendTo(frame);
  var body = $('<div></div>').addClass("dialog-body").appendTo(frame);
  var footer = $('<div></div>').addClass("dialog-footer").appendTo(frame);

  /*--------------------------------------------------
   * Body
   *--------------------------------------------------
   */
  var literalTypeSelectHtml =
    '<option value="/type/text" checked>text</option>' +
    '<option value="/type/int">int</option>' +
    '<option value="/type/float">float</option>' +
    '<option value="/type/double">double</option>' +
    '<option value="/type/boolean">boolean</option>' +
    '<option value="/type/datetime">date/time</option>' + 
    '<option value="/type/rawstring">rawstring</option>';

  var html = $(
    '<div class="grid-layout layout-looser layout-full"><table>' +
    '<tr>' +
    '<td>' +
    '<div class="grid-layout layout-loose"><table>' +
    '<tr>' +
    '<td>' +
    '<div class="schema-align-node-dialog-node-type">' +
    '<input type="radio" name="schema-align-node-dialog-node-type" value="cell-as" bind="radioNodeTypeCellAs" /> Set to Cell in Column' +
    '</div>' +
    '</td>' +
    '</tr>' +
    '<tr>' +
    '<td>' +
    '<div class="grid-layout layout-normal"><table>' +
    '<tr>' +
    '<td><div class="schema-alignment-node-dialog-column-list grid-layout layout-tightest" bind="divColumns"></div></td>' +
    '<td>' +
    '<div class="grid-layout layout-tight"><table cols="4">' +
    '<tr>' +
    '<td colspan="4">The cell\'s content is used ...</td>' +
    '</tr>' +
    '<tr>' +
    '<td><input type="radio" name="schema-align-node-dialog-node-subtype" value="cell-as-topic" bind="radioNodeTypeCellAsTopic" /></td>' +
    '<td colspan="3">to specify a Freebase topic, as reconciled</td>' +
    '</tr>' +
    '<tr>' +
    '<td></td>' +
    '<td colspan="3">Type new topics as</td>' +
    '</tr>' +
    '<tr>' +
    '<td></td>' +
    '<td colspan="3"><input bind="cellAsTopicNodeTypeInput" /></td>' +
    '</tr>' +
    '<tr>' +
    '<td><input type="radio" name="schema-align-node-dialog-node-subtype" value="cell-as-value" bind="radioNodeTypeCellAsValue" /></td>' +
    '<td colspan="3">as a literal value</td>' +
    '</tr>' +
    '<tr>' +
    '<td></td>' +
    '<td colspan="2">Literal type</td>' +
    '<td colspan="1"><select bind="cellAsValueTypeSelect">' + literalTypeSelectHtml + '</select></td>' +
    '</tr>' +
    '<tr>' +
    '<td></td>' +
    '<td colspan="2">Text language</td>' +
    '<td colspan="1"><input bind="cellAsValueLanguageInput" /></td>' +
    '</tr>' +

    '<tr>' +
    '<td><input type="radio" name="schema-align-node-dialog-node-subtype" value="cell-as-key" bind="radioNodeTypeCellAsKey" /></td>' +
    '<td colspan="3">as a key in a namespace</td>' +
    '</tr>' +
    '<tr>' +
    '<td></td>' +
    '<td colspan="2">Namespace</td>' +
    '<td colspan="1"><input bind="cellAsKeyInput" /></td>' +
    '</tr>' +
    '</table></div>' +
    '</td>' +
    '</tr>' +
    '</table></div>' +
    '</td>' +
    '</tr>' +
    '</table></div>' +
    '</td>' +

    '<td>' +
    '<div class="grid-layout layout-normal"><table>' +
    '<tr>' +
    '<td colspan="3">' +
    '<div class="schema-align-node-dialog-node-type">' +
    '<input type="radio" name="schema-align-node-dialog-node-type" value="anonymous" bind="radioNodeTypeAnonymous" /> Generate an anonymous graph node' +
    '</div>' +
    '</td>' +
    '</tr>' +
    '<tr>' +
    '<td></td>' +
    '<td>Assign a type to the node</td>' +
    '<td>&nbsp;<input bind="anonymousNodeTypeInput" /></td>' +
    '</tr>' +

    '<tr>' +
    '<td colspan="3">' +
    '<div class="schema-align-node-dialog-node-type">' +
    '<input type="radio" name="schema-align-node-dialog-node-type" value="topic" bind="radioNodeTypeTopic" /> Use one existing Freebase topic' +
    '</div>' +
    '</td>' +
    '</tr>' +
    '<tr>' +
    '<td></td>' +
    '<td>Topic</td>' +
    '<td><input bind="topicNodeTypeInput" /></td>' +
    '</tr>' +

    '<tr>' +
    '<td colspan="3">' +
    '<div class="schema-align-node-dialog-node-type">' +
    '<input type="radio" name="schema-align-node-dialog-node-type" value="value" bind="radioNodeTypeValue" /> Use a literal value' +
    '</div>' +
    '</td>' +
    '</tr>' +
    '<tr>' +
    '<td></td>' +
    '<td>Value</td>' +
    '<td><input bind="valueNodeTypeValueInput" /></td>' +
    '</tr>' +
    '<tr>' +
    '<td></td>' +
    '<td>Value type</td>' +
    '<td><select bind="valueNodeTypeValueTypeSelect">' + literalTypeSelectHtml + '</select></td>' +
    '</tr>' +
    '<tr>' +
    '<td></td>' +
    '<td>Language</td>' +
    '<td><input bind="valueNodeTypeLanguageInput" /></td>' +
    '</tr>' +
    '</table></div>' +
    '</td>' +
    '</tr>' +
    '</table></div>'
  ).appendTo(body);

  var elmts = DOM.bind(html);

  var tableColumns = $('<table></table>')
  .attr("cellspacing", "5")
  .attr("cellpadding", "0")
  .appendTo(elmts.divColumns)[0];

  var columnMap = {};
  if ("columnNames" in self._node) {
    for (var i = 0; i < self._node.columnNames.length; i++) {
      columnMap[self._node.columnNames[i]] = true;
    }
  }

  var makeColumnChoice = function(column, columnIndex) {
    var tr = tableColumns.insertRow(tableColumns.rows.length);

    var radio = $('<input />')
    .attr("type", "checkbox")
    .attr("value", column.name)
    .attr("name", "schema-align-node-dialog-column")
    .appendTo(tr.insertCell(0))
    .click(function() {
      elmts.radioNodeTypeCellAs[0].checked = true;

      if ("reconConfig" in column) {
        var typeID = column.reconConfig.type.id;
        var typeName = column.reconConfig.type.name;

        elmts.cellAsTopicNodeTypeInput[0].value = typeName;
        elmts.cellAsTopicNodeTypeInput.data("data.suggest", { "id" : typeID, "name" : typeName });
        elmts.radioNodeTypeCellAsTopic[0].checked = true;
      }
    });

    if (column.name in columnMap) {
      radio.attr("checked", "true");
    }

    $('<span></span>').text(column.name).appendTo(tr.insertCell(1));
  };
  var columns = theProject.columnModel.columns;
  for (var i = 0; i < columns.length; i++) {
    makeColumnChoice(columns[i], i);
  }

  elmts.anonymousNodeTypeInput
  .bind("focus", function() { elmts.radioNodeTypeAnonymous[0].checked = true; })
  .suggestT({ filter : "(all type:/type/type)" });

  elmts.topicNodeTypeInput
  .bind("focus", function() { elmts.radioNodeTypeTopic[0].checked = true; })
  .suggest({});

  elmts.valueNodeTypeValueInput
  .bind("focus", function() { elmts.radioNodeTypeValue[0].checked = true; });
  elmts.valueNodeTypeValueTypeSelect
  .bind("focus", function() { elmts.radioNodeTypeValue[0].checked = true; });
  elmts.valueNodeTypeLanguageInput
  .bind("focus", function() { elmts.radioNodeTypeValue[0].checked = true; })
  .suggest({ filter : "(all type:/type/lang)" });

  elmts.cellAsTopicNodeTypeInput
  .bind("focus", function() {
    elmts.radioNodeTypeCellAs[0].checked = true;
    elmts.radioNodeTypeCellAsTopic[0].checked = true; 
  })
  .suggestT({ filter : "(all type:/type/type)" });

  elmts.cellAsValueTypeSelect
  .bind("focus", function() {
    elmts.radioNodeTypeCellAs[0].checked = true;
    elmts.radioNodeTypeCellAsValue[0].checked = true; 
  });
  elmts.cellAsValueLanguageInput
  .bind("focus", function() {
    elmts.radioNodeTypeCellAs[0].checked = true;
    elmts.radioNodeTypeCellAsValue[0].checked = true; 
  })
  .suggest({ filter : "(all type:/type/lang)" });

  elmts.cellAsKeyInput
  .bind("focus", function() {
    elmts.radioNodeTypeCellAs[0].checked = true;
    elmts.radioNodeTypeCellAsKey[0].checked = true;
  })
  .suggest({ filter : "(all type:/type/namespace)" });

  elmts.radioNodeTypeCellAsTopic[0].checked = true; // just make sure some subtype is selected
  if (this._node.nodeType.match(/^cell-as-/)) {
    elmts.radioNodeTypeCellAs[0].checked = true;
    if (this._node.nodeType == "cell-as-topic") {
      elmts.radioNodeTypeCellAsTopic[0].checked = true;
    } else if (this._node.nodeType == "cell-as-value") {
      elmts.radioNodeTypeCellAsValue[0].checked = true;
    } else if (this._node.nodeType == "cell-as-key") {
      elmts.radioNodeTypeCellAsKey[0].checked = true;
    }
  } else if (this._node.nodeType == "anonymous") {
    elmts.radioNodeTypeAnonymous[0].checked = true;
  } else if (this._node.nodeType == "topic") {
    elmts.radioNodeTypeTopic[0].checked = true;
  } else if (this._node.nodeType == "value") {
    elmts.radioNodeTypeValue[0].checked = true;
  }

  if ("type" in this._node) {
    elmts.anonymousNodeTypeInput[0].value = this._node.type.name;
    elmts.anonymousNodeTypeInput.data("data.suggest", this._node.type);

    elmts.cellAsTopicNodeTypeInput[0].value = this._node.type.name;
    elmts.cellAsTopicNodeTypeInput.data("data.suggest", this._node.type);
  }
  if ("topic" in this._node) {
    elmts.topicNodeTypeInput[0].value = this._node.topic.name;
    elmts.topicNodeTypeInput.data("data.suggest", this._node.topic);
  }
  if ("namespace" in this._node) {
    elmts.cellAsKeyInput[0].value = this._node.namespace.name;
    elmts.cellAsKeyInput.data("data.suggest", this._node.namespace);
  }
  if ("lang" in this._node) {
    elmts.valueNodeTypeLanguageInput[0].value = this._node.lang;
    elmts.valueNodeTypeLanguageInput.data("data.suggest", { id: this._node.lang });

    elmts.cellAsValueLanguageInput[0].value = this._node.lang;
    elmts.cellAsValueLanguageInput.data("data.suggest", { id: this._node.lang });
  }
  if ("valueType" in this._node) {
    elmts.valueNodeTypeValueTypeSelect[0].value = this._node.valueType;
    elmts.cellAsValueTypeSelect[0].value = this._node.valueType;
  }

  /*--------------------------------------------------
   * Footer
   *--------------------------------------------------
   */

  var getResultJSON = function() {
    var node = {
      nodeType: $("input[name='schema-align-node-dialog-node-type']:checked")[0].value
    };
    if (node.nodeType == "cell-as") {
      node.nodeType = $("input[name='schema-align-node-dialog-node-subtype']:checked")[0].value;
      node.columnNames = $("input[name='schema-align-node-dialog-column']:checked").map(function() {
        return this.getAttribute("value");
      }).get();

      if (node.columnNames.length == 0) {
        alert("You must select at least one column.");
        return null;
      }

      if (node.nodeType == "cell-as-topic") {
        var t = elmts.cellAsTopicNodeTypeInput.data("data.suggest");
        if (!(t)) {
          alert("For creating a new graph node, you need to specify a type for it.");
          elmts.cellAsTopicNodeTypeInput.focus();
          return null;
        }
        node.type = {
          id: t.id,
          name: t.name
        };
      } else if (node.nodeType == "cell-as-value") {
        node.valueType = elmts.cellAsValueTypeSelect[0].value;

        if (node.valueType == "/type/text") {
          var l = elmts.cellAsValueLanguageInput.data("data.suggest");
          node.lang = (l) ? l.id : "/lang/en";
        }
      } else if (node.nodeType == "cell-as-key") {
        var t = elmts.cellAsKeyInput.data("data.suggest");
        if (!(t)) {
          alert("Please specify the namespace.");
          return null;
        }
        node.namespace = {
          id: t.id,
          name: t.name
        };
      }
    } else if (node.nodeType == "anonymous") {
      var t = elmts.anonymousNodeTypeInput.data("data.suggest");
      if (!(t)) {
        alert("For generating an anonymous graph node, you need to specify a type for it.");
        return null;
      }
      node.type = {
        id: t.id,
        name: t.name
      };
    } else if (node.nodeType == "topic") {
      var t = elmts.topicNodeTypeInput.data("data.suggest");
      if (!(t)) {
        alert("Please specify which existing Freebase topic to use.");
        return null;
      }
      node.topic = {
        id: t.id,
        name: t.name
      };
    } else if (node.nodeType == "value") {
      node.value = $.trim(elmts.valueNodeTypeValueInput[0].value);
      if (!node.value.length) {
        alert("Please specify the value to use.");
        return null;
      }
      node.valueType = elmts.valueNodeTypeValueTypeSelect[0].value;

      if (node.valueType == "/type/text") {
        var l = elmts.valueNodeTypeLanguageInput.data("data.suggest");
        node.lang = (l) ? l.id : "/lang/en";
      }
    }

    return node;
  };

  $('<button class="button"></button>').html("&nbsp;&nbsp;OK&nbsp;&nbsp;").click(function() {
    var node = getResultJSON();
    if (node !== null) {
      DialogSystem.dismissUntil(level - 1);

      self._node = node;
      self.render();
      self._dialog.preview();
    }
  }).appendTo(footer);

  $('<button class="button"></button>').text("Cancel").click(function() {
    DialogSystem.dismissUntil(level - 1);
  }).appendTo(footer);

  var level = DialogSystem.showDialog(frame);
};

SchemaAlignmentDialog.UINode.prototype.getJSON = function() {
  var result = null;
  var getLinks = false;

  if (this._node.nodeType.match(/^cell-as-/)) {
    if (!("columnNames" in this._node) || !this._node.columnNames) {
      return null;
    }

    if (this._node.nodeType == "cell-as-topic") {
      result = {
        nodeType: this._node.nodeType,
        columnNames: this._node.columnNames,
        type: "type" in this._node ? cloneDeep(this._node.type) : { "id" : "/common/topic", "name" : "Topic", "cvt" : false }
      };
      getLinks = true;
    } else if (this._node.nodeType == "cell-as-value") {
      result = {
        nodeType: this._node.nodeType,
        columnNames: this._node.columnNames,
        valueType: "valueType" in this._node ? this._node.valueType : "/type/text",
            lang: "lang" in this._node ? this._node.lang : "/lang/en"
      };
    } else if (this._node.nodeType == "cell-as-key") {
      if (!("namespace" in this._node) || !this._node.namespace) {
        return null;
      }
      result = {
        nodeType: this._node.nodeType,
        columnNames: this._node.columnNames,
        namespace: cloneDeep(this._node.namespace)
      };
    }
  } else if (this._node.nodeType == "topic") {
    if (!("topic" in this._node) || !this._node.topic) {
      return null;
    }
    result = {
      nodeType: this._node.nodeType,
      topic: cloneDeep(this._node.topic)
    };
    getLinks = true;
  } else if (this._node.nodeType == "value") {
    if (!("value" in this._node) || !this._node.value) {
      return null;
    }
    result = {
      nodeType: this._node.nodeType,
      value: this._node.value,
      valueType: "valueType" in this._node ? this._node.valueType : "/type/text",
          lang: "lang" in this._node ? this._node.lang : "/lang/en"
    };
  } else if (this._node.nodeType == "anonymous") {
    if (!("type" in this._node) || !this._node.type) {
      return null;
    }
    result = {
      nodeType: this._node.nodeType,
      type: cloneDeep(this._node.type)
    };
    getLinks = true;
  }

  if (!result) {
    return null;
  }
  if (getLinks) {
    var links = [];
    for (var i = 0; i < this._linkUIs.length; i++) {
      var link = this._linkUIs[i].getJSON();
      if (link !== null) {
        links.push(link);
      }
    }
    result.links = links;
  }

  return result;
};