/**
 * @license
 * Visual Blocks Editor
 *
 * Copyright 2017 Google Inc.
 * https://developers.google.com/blockly/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @fileoverview Utility functions for handling variables dynamic.
 *
 * @author duzc2dtw@gmail.com (Du Tian Wei)
 */
'use strict';

goog.provide('Blockly.VariablesDynamic');

goog.require('Blockly.Variables');
goog.require('Blockly.Blocks');
goog.require('Blockly.constants');
goog.require('Blockly.VariableModel');
goog.require('Blockly.Workspace');
goog.require('goog.string');


Blockly.VariablesDynamic.onCreateVariableButtonClick_String = function(button) {
  Blockly.Variables.createVariable(button.getTargetWorkspace(), null, 'String');
};
Blockly.VariablesDynamic.onCreateVariableButtonClick_Number = function(button) {
  Blockly.Variables.createVariable(button.getTargetWorkspace(), null, 'Number');
};
Blockly.VariablesDynamic.onCreateVariableButtonClick_Colour = function(button) {
  Blockly.Variables.createVariable(button.getTargetWorkspace(), null, 'Colour');
};
/**
 * Construct the elements (blocks and button) required by the flyout for the
 * variable category.
 * @param {!Blockly.Workspace} workspace The workspace contianing variables.
 * @return {!Array.<!Element>} Array of XML elements.
 */
Blockly.VariablesDynamic.flyoutCategory = function(workspace) {
  var xmlList = [];
  var button = goog.dom.createDom('button');
  button.setAttribute('text', Blockly.Msg.NEW_STRING_VARIABLE);
  button.setAttribute('callbackKey', 'CREATE_VARIABLE_STRING');
  xmlList.push(button);
  button = goog.dom.createDom('button');
  button.setAttribute('text', Blockly.Msg.NEW_NUMBER_VARIABLE);
  button.setAttribute('callbackKey', 'CREATE_VARIABLE_NUMBER');
  xmlList.push(button);button = goog.dom.createDom('button');
  button.setAttribute('text', Blockly.Msg.NEW_COLOUR_VARIABLE);
  button.setAttribute('callbackKey', 'CREATE_VARIABLE_COLOUR');
  xmlList.push(button);

  workspace.registerButtonCallback('CREATE_VARIABLE_STRING',
    Blockly.VariablesDynamic.onCreateVariableButtonClick_String);
  workspace.registerButtonCallback('CREATE_VARIABLE_NUMBER',
    Blockly.VariablesDynamic.onCreateVariableButtonClick_Number);
  workspace.registerButtonCallback('CREATE_VARIABLE_COLOUR',
    Blockly.VariablesDynamic.onCreateVariableButtonClick_Colour);


  var blockList = Blockly.VariablesDynamic.flyoutCategoryBlocks(workspace);
  xmlList = xmlList.concat(blockList);
  return xmlList;
};

/**
 * Construct the blocks required by the flyout for the variable category.
 * @param {!Blockly.Workspace} workspace The workspace contianing variables.
 * @return {!Array.<!Element>} Array of XML block elements.
 */
Blockly.VariablesDynamic.flyoutCategoryBlocks = function(workspace) {
  var variableModelList = workspace.getAllVariables();
  variableModelList.sort(Blockly.VariableModel.compareByName);

  var xmlList = [];
  if (variableModelList.length > 0) {

    if (Blockly.Blocks['variables_set_dynamic']) {
      var firstVariable = variableModelList[0];
      var gap = 24;
      var blockText = '<xml>' +
                    '<block type="variables_set_dynamic" gap="' + gap + '">' +
                    Blockly.Variables.generateVariableFieldXml_(firstVariable) +
                    '</block>' +
                    '</xml>';
      var block = Blockly.Xml.textToDom(blockText).firstChild;
      xmlList.push(block);
    }
    for (var i = 0, variable; variable = variableModelList[i]; i++) {
      if (Blockly.Blocks['variables_get_dynamic']) {
        var blockText = '<xml>' +
                    '<block type="variables_get_dynamic" gap="8">' +
                    Blockly.Variables.generateVariableFieldXml_(variable) +
                    '</block>' +
                    '</xml>';
        var block = Blockly.Xml.textToDom(blockText).firstChild;
        xmlList.push(block);
      }
    }
  }
  return xmlList;
};