text: 'use strict';
  
  goog.provide('Blockly.Blocks.tuple');
  
  goog.require('Blockly.Blocks');
  
  
  Blockly.Blocks.tuple.HUE = 195//'#5ec73d'//195;
  
  
  Blockly.Blocks['tuple_create_with'] = {
    /**
     * Block for creating a list with any number of elements of any type.
     * @this Blockly.Block
     */
    init: function() {
      this.setColour(Blockly.Blocks.tuple.HUE);
    this.appendDummyInput("")
    //don't need to specify the data type in Python
          // .appendField(new Blockly.FieldDropdown([[Blockly.MIXLY_NUMBER, 'Array<number>'], [Blockly.LANG_MATH_STRING, 'Array<string>'], [Blockly.LANG_MATH_BOOLEAN, 'Array<boolean>']]), 'TYPE')
          // .appendField(' ')
          .appendField(new Blockly.FieldTextInput('mytup'), 'VAR');
      this.itemCount_ = 3;
      this.updateShape_();
      this.setPreviousStatement(true);
      this.setNextStatement(true);
      this.setMutator(new Blockly.Mutator(['tuple_create_with_item']));
      this.setTooltip(Blockly.Msg.TUPLE_CREATE_WITH_TOOLTIP);
    },
    /**
     * Create XML to represent list inputs.
     * @return {Element} XML storage element.
     * @this Blockly.Block
     */
    mutationToDom: function() {
      var container = document.createElement('mutation');
      container.setAttribute('items', this.itemCount_);
      return container;
    },
    /**
     * Parse XML to restore the list inputs.
     * @param {!Element} xmlElement XML storage element.
     * @this Blockly.Block
     */
    domToMutation: function(xmlElement) {
      this.itemCount_ = parseInt(xmlElement.getAttribute('items'), 10);
      this.updateShape_();
    },
    /**
     * Populate the mutator's dialog with this block's components.
     * @param {!Blockly.Workspace} workspace Mutator's workspace.
     * @return {!Blockly.Block} Root block in mutator.
     * @this Blockly.Block
     */
    decompose: function(workspace) {
      var containerBlock =
          Blockly.Block.obtain(workspace, 'tuple_create_with_container');
      containerBlock.initSvg();
      var connection = containerBlock.getInput('STACK').connection;
      for (var i = 0; i < this.itemCount_; i++) {
        var itemBlock = Blockly.Block.obtain(workspace, 'tuple_create_with_item');
        itemBlock.initSvg();
        connection.connect(itemBlock.previousConnection);
        connection = itemBlock.nextConnection;
      }
      return containerBlock;
    },
    /**
     * Reconfigure this block based on the mutator dialog's components.
     * @param {!Blockly.Block} containerBlock Root block in mutator.
     * @this Blockly.Block
     */
    compose: function(containerBlock) {
      var itemBlock = containerBlock.getInputTargetBlock('STACK');
      // Count number of inputs.
      var connections = [];
      var i = 0;
      while (itemBlock) {
        connections[i] = itemBlock.valueConnection_;
        itemBlock = itemBlock.nextConnection &&
            itemBlock.nextConnection.targetBlock();
        i++;
      }
      this.itemCount_ = i;
      this.updateShape_();
      // Reconnect any child blocks.
      for (var i = 0; i < this.itemCount_; i++) {
        if (connections[i]) {
          this.getInput('ADD' + i).connection.connect(connections[i]);
        }
      }
    },
    /**
     * Store pointers to any connected child blocks.
     * @param {!Blockly.Block} containerBlock Root block in mutator.
     * @this Blockly.Block
     */
    saveConnections: function(containerBlock) {
      var itemBlock = containerBlock.getInputTargetBlock('STACK');
      var i = 0;
      while (itemBlock) {
        var input = this.getInput('ADD' + i);
        itemBlock.valueConnection_ = input && input.connection.targetConnection;
        i++;
        itemBlock = itemBlock.nextConnection &&
            itemBlock.nextConnection.targetBlock();
      }
    },
    /**
     * Modify this block to have the correct number of inputs.
     * @private
     * @this Blockly.Block
     */
    updateShape_: function() {
      // Delete everything.
      if (this.getInput('EMPTY')) {
        this.removeInput('EMPTY');
      } else {
        var i = 0;
        while (this.getInput('ADD' + i)) {
          this.removeInput('ADD' + i);
          i++;
        }
      }
      // Rebuild block.
      if (this.itemCount_ == 0) {
        this.appendDummyInput('EMPTY')
            .appendField(Blockly.Msg.TUPLE_CREATE_EMPTY_TITLE);
      } else {
        for (var i = 0; i < this.itemCount_; i++) {
          var input = this.appendValueInput('ADD' + i);
          if (i == 0) {
            input.appendField(Blockly.Msg.TUPLE_CREATE_WITH_INPUT_WITH);
          }
        }
      }
    },
    getVars: function() {
      return [this.getFieldValue('VAR')];
    },
    renameVar: function(oldName, newName) {
      if (Blockly.Names.equals(oldName, this.getFieldValue('VAR'))) {
        this.setTitleValue(newName, 'VAR');
      }
    }
  };
  
  Blockly.Blocks['tuple_create_with_container'] = {
    /**
     * Mutator block for list container.
     * @this Blockly.Block
     */
    init: function() {
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.appendDummyInput()
          .appendField(Blockly.Msg.TUPLE_CREATE_WITH_CONTAINER_TITLE_ADD);
      this.appendStatementInput('STACK');
      this.setTooltip(Blockly.Msg.TUPLE_CREATE_WITH_CONTAINER_TOOLTIP);
      this.contextMenu = false;
    }
  };
  
  Blockly.Blocks['tuple_create_with_item'] = {
    /**
     * Mutator bolck for adding items.
     * @this Blockly.Block
     */
    init: function() {
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.appendDummyInput()
          .appendField(Blockly.Msg.blockpy_SET_VARIABLES_NAME);
      this.setPreviousStatement(true);
      this.setNextStatement(true);
      this.setTooltip(Blockly.Msg.TUPLE_CREATE_WITH_ITEM_TOOLTIP);
      this.contextMenu = false;
    }
  };
  
  Blockly.Blocks['tuple_create_with_text2'] = {
    init: function() {
      this.setColour(Blockly.Blocks.tuple.HUE);
    this.appendDummyInput("")
    //don't need to specify the data type in Python
          // .appendField(new Blockly.FieldDropdown([[Blockly.MIXLY_NUMBER, 'Array<number>']]), 'TYPE')
          // .appendField(' ')
      // .appendField(Blockly.blockpy_MIXLY_TUPLE_CREATE)
          .appendField(new Blockly.FieldTextInput('mytup'), 'VAR')
          //.appendField(new Blockly.FieldTextInput('3',Blockly.FieldTextInput.math_number_validator), 'SIZE')
        // .appendField(Blockly.MIXLY_MAKELISTFROM)
      // .appendField(this.newQuote_(true))
          .appendField(' = (')
          .appendField(new Blockly.FieldTextInput('0,0,0'), 'TEXT')
          .appendField(')');
          // .appendField(this.newQuote_(false))
      this.setPreviousStatement(true);
      this.setNextStatement(true);
    this.setTooltip(Blockly.MIXPY_TOOLTIP_TUPLE_CREATE_WITH_TEXT);
    },
    getVars: function() {
      return [this.getFieldValue('VAR')];
    },
    renameVar: function(oldName, newName) {
      if (Blockly.Names.equals(oldName, this.getFieldValue('VAR'))) {
        this.setTitleValue(newName, 'VAR');
      }
    }
    // newQuote_: function(open) {
    //   if (open == this.RTL) {
    //     var file = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAKCAQAAAAqJXdxAAAAqUlEQVQI1z3KvUpCcRiA8ef9E4JNHhI0aFEacm1o0BsI0Slx8wa8gLauoDnoBhq7DcfWhggONDmJJgqCPA7neJ7p934EOOKOnM8Q7PDElo/4x4lFb2DmuUjcUzS3URnGib9qaPNbuXvBO3sGPHJDRG6fGVdMSeWDP2q99FQdFrz26Gu5Tq7dFMzUvbXy8KXeAj57cOklgA+u1B5AoslLtGIHQMaCVnwDnADZIFIrXsoXrgAAAABJRU5ErkJggg==';
    //   } else {
    //     var file = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAKCAQAAAAqJXdxAAAAn0lEQVQI1z3OMa5BURSF4f/cQhAKjUQhuQmFNwGJEUi0RKN5rU7FHKhpjEH3TEMtkdBSCY1EIv8r7nFX9e29V7EBAOvu7RPjwmWGH/VuF8CyN9/OAdvqIXYLvtRaNjx9mMTDyo+NjAN1HNcl9ZQ5oQMM3dgDUqDo1l8DzvwmtZN7mnD+PkmLa+4mhrxVA9fRowBWmVBhFy5gYEjKMfz9AylsaRRgGzvZAAAAAElFTkSuQmCC';
    //   }
    //   return new Blockly.FieldImage(file, 12, 12, '"');
    // }
  }
  
  Blockly.Blocks['tuple_create_with_text_return'] = {
    init: function() {
      this.setColour(Blockly.Blocks.tuple.HUE);
    this.appendDummyInput("")
          .appendField('(')
          .appendField(new Blockly.FieldTextInput('0,0,0'), 'TEXT')
          .appendField(')');
          // .appendField(this.newQuote_(false))
    this.setOutput(true);
    this.setInputsInline(true);
    this.setTooltip(Blockly.MIXPY_TOOLTIP_TUPLE_CREATE_WITH_TEXT);
    // },
    // getVars: function() {
    //   return [this.getFieldValue('VAR')];
    // },
    // renameVar: function(oldName, newName) {
    //   if (Blockly.Names.equals(oldName, this.getFieldValue('VAR'))) {
    //     this.setTitleValue(newName, 'VAR');
    //   }
    }
    // newQuote_: function(open) {
    //   if (open == this.RTL) {
    //     var file = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAKCAQAAAAqJXdxAAAAqUlEQVQI1z3KvUpCcRiA8ef9E4JNHhI0aFEacm1o0BsI0Slx8wa8gLauoDnoBhq7DcfWhggONDmJJgqCPA7neJ7p934EOOKOnM8Q7PDElo/4x4lFb2DmuUjcUzS3URnGib9qaPNbuXvBO3sGPHJDRG6fGVdMSeWDP2q99FQdFrz26Gu5Tq7dFMzUvbXy8KXeAj57cOklgA+u1B5AoslLtGIHQMaCVnwDnADZIFIrXsoXrgAAAABJRU5ErkJggg==';
    //   } else {
    //     var file = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAKCAQAAAAqJXdxAAAAn0lEQVQI1z3OMa5BURSF4f/cQhAKjUQhuQmFNwGJEUi0RKN5rU7FHKhpjEH3TEMtkdBSCY1EIv8r7nFX9e29V7EBAOvu7RPjwmWGH/VuF8CyN9/OAdvqIXYLvtRaNjx9mMTDyo+NjAN1HNcl9ZQ5oQMM3dgDUqDo1l8DzvwmtZN7mnD+PkmLa+4mhrxVA9fRowBWmVBhFy5gYEjKMfz9AylsaRRgGzvZAAAAAElFTkSuQmCC';
    //   }
    //   return new Blockly.FieldImage(file, 12, 12, '"');
    // }
  }
  
  Blockly.Blocks.tuple_getIndex = {
    init: function() {
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.setOutput(true);
      this.appendValueInput('TUP')
          .setCheck('Tuple')
      this.appendValueInput('AT')
          .setCheck(Number)
      
          .appendField(Blockly.LANG_LISTS_GET_INDEX1);
      this.appendDummyInput("")
          .appendField(Blockly.LANG_LISTS_GET_INDEX2);
      this.setInputsInline(true);
      this.setTooltip(Blockly.TUPLE_GET_INDEX_TOOLTIP);
    }
  };
  
  Blockly.Blocks['tuple_length'] = {
    /**
     * Block for list length.
     * @this Blockly.Block
     */
    init: function() {
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.appendValueInput('TUP');
    this.appendDummyInput("")
          .appendField(Blockly.MIXLY_LENGTH);
          
    this.setTooltip(Blockly.Msg.TUPLE_LENGTH_TOOLTIP);
    this.setOutput(true, Number);
    }
  };
  
  Blockly.Blocks['tuple_del'] = {
    /**
     * Block for list length.
     * @this Blockly.Block
     */
    init: function() {
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.appendValueInput('TUP')
          .setCheck('Tuple')
      this.appendDummyInput("")         
          .appendField(Blockly.Msg.TUPLE_DEL);  
      this.setPreviousStatement(true);
      this.setNextStatement(true);
      this.setTooltip(Blockly.Msg.TUPLE_DEL_TOOLTIP);
    }
  };
  
  Blockly.Blocks['tuple_join'] = {
    /**
     * Block for list length.
     * @this Blockly.Block
     */
    init: function() {
      this.setColour(Blockly.Blocks.tuple.HUE);
    this.appendValueInput('TUP1')
          .setCheck('Tuple')
    this.appendDummyInput("")
          .appendField(Blockly.Msg.TUPLE_JOIN)
    this.appendValueInput('TUP2')
          .setCheck('Tuple')
    this.setInputsInline(true);
    this.setTooltip(Blockly.Msg.TUPLE_JOIN_TOOLTIP);
    this.setOutput(true, "Tuple");
    }
  };
  
  
  Blockly.Blocks['tuple_max'] = {
    init: function() {
       this.appendValueInput('TUP')
          .setCheck('Tuple')
    var max_min =
          [[Blockly.blockpy_TUPLE_MAX, 'max'],[Blockly.blockpy_TUPLE_MIN, 'min'],[Blockly.Msg.MATH_ONLIST_OPERATOR_SUM,'sum']];
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.appendDummyInput("")
          .appendField(Blockly.MIXLY_MICROBIT_JS_GET)
          .appendField(new Blockly.FieldDropdown(max_min), 'DIR')
          
  
    this.setInputsInline(true);
    this.setOutput(true);
    var thisBlock = this;
      this.setTooltip(function() {
        var mode = thisBlock.getFieldValue('DIR');
        var TOOLTIPS = {
          'max': Blockly.MIXLY_TOOLTIP_TUPLE_MAX,
          'min': Blockly.MIXLY_TOOLTIP_TUPLE_MIN,
          'sum': Blockly.MIXLY_TOOLTIP_TUPLE_SUM
        };
        return TOOLTIPS[mode];
      });
    }
  };
  
  Blockly.Blocks['tuple_change_to'] = {
    init: function() {
      var OPERATORS =
          [[Blockly.MIXLY_MICROBIT_TYPE_LIST, 'list'],
           [Blockly.Msg.blockpy_SET_CREATE_WITH_CONTAINER_TITLE_ADD, 'set']
          ];
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.appendValueInput('VAR')
          .setCheck("Tuple")
          // .appendField(Blockly.blockpy_USE_LIST);   
      this.appendDummyInput("")
          .appendField(Blockly.Msg.A_TO_B)
          .appendField(new Blockly.FieldDropdown(OPERATORS), 'OP');
      this.setInputsInline(true);
      this.setOutput(true);
      var thisBlock = this;
      this.setTooltip(function() {
        var mode = thisBlock.getFieldValue('OP');
        var TOOLTIPS = {
          'list': Blockly.Msg.TUPLE_TO_LISTS,
          'set': Blockly.Msg.TUPLE_TO_SET,
        };
        return TOOLTIPS[mode];
      });
    }
  };
  
  Blockly.Blocks['tuple_find'] = {
    init: function() {
      var OPERATORS =
          [[Blockly.Msg.MIXLY_LIST_INDEX, 'INDEX'],
           [Blockly.Msg.MIXLY_LIST_COUNT, 'COUNT']
          ];
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.appendValueInput('VAR')
          .setCheck('List')
      this.appendValueInput('data')
          .appendField(Blockly.MIXLY_MICROBIT_PY_STORAGE_GET)
          .appendField(Blockly.Msg.HTML_VALUE)
      this.appendDummyInput()
          .appendField(Blockly.MIXLY_DE)
          .appendField(new Blockly.FieldDropdown(OPERATORS), 'OP');
          //.appendField(new Blockly.FieldTextInput('mylist'), 'VAR')
      this.setInputsInline(true);
      this.setOutput(true, Number);
       var thisBlock = this;
      this.setTooltip(function() {
        var mode = thisBlock.getFieldValue('OP');
        var TOOLTIPS = {
          'INDEX': Blockly.MIXLY_TOOLTIP_TUPLE_FIND_INDEX,
          'COUNT': Blockly.MIXLY_TOOLTIP_TUPLE_FIND_COUNT
          
        };
        return TOOLTIPS[mode];
      });  
    }
  };
  
  Blockly.Blocks['tuple_trig'] = {
    init: function() {
      var OPERATORS =
          [[Blockly.Msg.MIXLY_LIST_LEN, 'LEN'],
           [Blockly.Msg.MATH_ONLIST_OPERATOR_SUM, 'SUM'],
           [Blockly.Msg.MATH_ONLIST_OPERATOR_MAX, 'MAX'],
           [Blockly.Msg.MATH_ONLIST_OPERATOR_MIN, 'MIN'],
           [Blockly.Msg.MATH_ONLIST_OPERATOR_AVERAGE, 'AVERAGE'],
           [Blockly.Msg.MATH_ONLIST_OPERATOR_MEDIAN, 'MEDIAN'],
           [Blockly.Msg.MATH_ONLIST_OPERATOR_MODE, 'MODE'],
           [Blockly.Msg.MATH_ONLIST_OPERATOR_STD_DEV, 'STD_DEV'],
          ];
      //this.setHelpUrl(Blockly.Msg.MATH_TRIG_HELPURL);
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.setOutput(true, Number);
      this.appendValueInput('data')
          .setCheck('List')
      this.appendDummyInput()
      .appendField(Blockly.MIXLY_MICROBIT_PY_STORAGE_GET)
          .appendField(new Blockly.FieldDropdown(OPERATORS), 'OP');
      this.setInputsInline(true);
      // Assign 'this' to a variable for use in the tooltip closure below.
      var thisBlock = this;
      this.setTooltip(function() {
        var mode = thisBlock.getFieldValue('OP');
        var TOOLTIPS = {
          'LEN': Blockly.Msg.TUPLE_LENGTH_TOOLTIP,
          'SUM': Blockly.Msg.MATH_ONLIST_TOOLTIP_TUPLE_SUM,
          'MAX': Blockly.Msg.MATH_ONLIST_TOOLTIP_TUPLE_MAX,
          'MIN': Blockly.Msg.MATH_ONLIST_TOOLTIP_TUPLE_MIN,
          'AVERAGE': Blockly.Msg.MATH_ONLIST_TOOLTIP_TUPLE_AVERAGE,
          'MEDIAN': Blockly.Msg.MATH_ONLIST_TOOLTIP_TUPLE_MEDIAN,
          'MODE': Blockly.Msg.MATH_ONLIST_TOOLTIP_TUPLE_MODE,
          'STD_DEV': Blockly.Msg.MATH_ONLIST_TOOLTIP_TUPLE_STD_DEV
          
        };
        return TOOLTIPS[mode];
      });
    }
  };
  
  Blockly.Blocks['tuple_getSublist'] = {
    /**
     * Block for getting sublist.
     * @this Blockly.Block
     */
    init: function() {
      this['WHERE_OPTIONS_1'] =
          [[Blockly.Msg.LISTS_GET_INDEX_FROM_START, 'FROM_START'],
           [Blockly.Msg.LISTS_GET_INDEX_FROM_END, 'FROM_END'],
           [Blockly.Msg.LISTS_GET_SUBLIST_START_FIRST, 'FIRST']];
      this['WHERE_OPTIONS_2'] =
          [[Blockly.Msg.LISTS_GET_SUBLIST_END_FROM_START, 'FROM_START'],
           [Blockly.Msg.LISTS_GET_SUBLIST_END_FROM_END, 'FROM_END'],
           [Blockly.Msg.LISTS_GET_SUBLIST_END_LAST, 'LAST']];
      this.setHelpUrl(Blockly.Msg.LISTS_GET_SUBLIST_HELPURL);
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.appendValueInput('LIST')
          .setCheck('List')
          //.appendField(Blockly.Msg.LISTS_GET_SUBLIST_TAIL)
      // if (Blockly.Msg.LISTS_GET_SUBLIST_TAIL) {
      //   this.appendDummyInput('TAIL')
      //       .appendField(Blockly.Msg.LISTS_GET_SUBLIST_TAIL);
      // }
      this.appendDummyInput('')
          .appendField(Blockly.MIXLY_MICROBIT_PY_STORAGE_GET);
      this.appendDummyInput('AT1');
      this.appendDummyInput('AT2');
      this.setInputsInline(true);
      this.setOutput(true, 'List');
      this.updateAt_(1, true);
      this.updateAt_(2, true);
      this.setTooltip(Blockly.Msg.PYTHON_TUPLE_GET_SUBLIST_TOOLTIP);
    },
    /**
     * Create XML to represent whether there are 'AT' inputs.
     * @return {Element} XML storage element.
     * @this Blockly.Block
     */
    mutationToDom: function() {
      var container = document.createElement('mutation');
      var isAt1 = this.getInput('AT1').type == Blockly.INPUT_VALUE;
      container.setAttribute('at1', isAt1);
      var isAt2 = this.getInput('AT2').type == Blockly.INPUT_VALUE;
      container.setAttribute('at2', isAt2);
      return container;
    },
    /**
     * Parse XML to restore the 'AT' inputs.
     * @param {!Element} xmlElement XML storage element.
     * @this Blockly.Block
     */
    domToMutation: function(xmlElement) {
      var isAt1 = (xmlElement.getAttribute('at1') == 'true');
      var isAt2 = (xmlElement.getAttribute('at2') == 'true');
      this.updateAt_(1, isAt1);
      this.updateAt_(2, isAt2);
    },
    /**
     * Create or delete an input for a numeric index.
     * This block has two such inputs, independant of each other.
     * @param {number} n Specify first or second input (1 or 2).
     * @param {boolean} isAt True if the input should exist.
     * @private
     * @this Blockly.Block
     */
    updateAt_: function(n, isAt) {
      // Create or delete an input for the numeric index.
      // Destroy old 'AT' and 'ORDINAL' inputs.
      this.removeInput('AT' + n);
      this.removeInput('ORDINAL' + n, true);
      // Create either a value 'AT' input or a dummy input.
      if (isAt) {
        this.appendValueInput('AT' + n).setCheck(Number);
        if (Blockly.Msg.TEXT_CHARAT_TAIL) {
          this.appendDummyInput('ORDINAL' + n)
              .appendField(Blockly.Msg.TEXT_CHARAT_TAIL);
        }
      } else {
        this.appendDummyInput('AT' + n);
      }
      var menu = new Blockly.FieldDropdown(this['WHERE_OPTIONS_' + n],
          function(value) {
            var newAt = (value == 'FROM_START') || (value == 'FROM_END');
            // The 'isAt' variable is available due to this function being a
            // closure.
            if (newAt != isAt) {
              var block = this.sourceBlock_;
              block.updateAt_(n, newAt);
              // This menu has been destroyed and replaced.
              // Update the replacement.
              block.setFieldValue(value, 'WHERE' + n);
              return null;
            }
            return undefined;
          });
      this.getInput('AT' + n)
          .appendField(menu, 'WHERE' + n);
      if (n == 1) {
        this.moveInputBefore('AT1', 'AT2');
        if (this.getInput('ORDINAL1')) {
          this.moveInputBefore('ORDINAL1', 'AT2');
        }
      }
      // if (Blockly.Msg.LISTS_GET_SUBLIST_TAIL) {
      //   this.moveInputBefore('TAIL', null);
      // }
    }
  };
  
  Blockly.Blocks['tuple_create_with_noreturn'] = {
    /**
     * Block for creating a list with any number of elements of any type.
     * @this Blockly.Block
     */
    init: function() {
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.itemCount_ = 3;
      this.updateShape_();
      this.setPreviousStatement(false);
      this.setNextStatement(false);
  	this.setOutput(true, "Tuple")
      this.setMutator(new Blockly.Mutator(['tuple_create_with_item']));
      this.setTooltip(Blockly.Msg.TUPLE_CREATE_WITH_TOOLTIP);
    },
    /**
     * Create XML to represent list inputs.
     * @return {Element} XML storage element.
     * @this Blockly.Block
     */
    mutationToDom: function() {
      var container = document.createElement('mutation');
      container.setAttribute('items', this.itemCount_);
      return container;
    },
    /**
     * Parse XML to restore the list inputs.
     * @param {!Element} xmlElement XML storage element.
     * @this Blockly.Block
     */
    domToMutation: function(xmlElement) {
      this.itemCount_ = parseInt(xmlElement.getAttribute('items'), 10);
      this.updateShape_();
    },
    /**
     * Populate the mutator's dialog with this block's components.
     * @param {!Blockly.Workspace} workspace Mutator's workspace.
     * @return {!Blockly.Block} Root block in mutator.
     * @this Blockly.Block
     */
    decompose: function(workspace) {
      var containerBlock =
          Blockly.Block.obtain(workspace, 'tuple_create_with_container');
      containerBlock.initSvg();
      var connection = containerBlock.getInput('STACK').connection;
      for (var i = 0; i < this.itemCount_; i++) {
        var itemBlock = Blockly.Block.obtain(workspace, 'tuple_create_with_item');
        itemBlock.initSvg();
        connection.connect(itemBlock.previousConnection);
        connection = itemBlock.nextConnection;
      }
      return containerBlock;
    },
    /**
     * Reconfigure this block based on the mutator dialog's components.
     * @param {!Blockly.Block} containerBlock Root block in mutator.
     * @this Blockly.Block
     */
    compose: function(containerBlock) {
      var itemBlock = containerBlock.getInputTargetBlock('STACK');
      // Count number of inputs.
      var connections = [];
      var i = 0;
      while (itemBlock) {
        connections[i] = itemBlock.valueConnection_;
        itemBlock = itemBlock.nextConnection &&
            itemBlock.nextConnection.targetBlock();
        i++;
      }
      this.itemCount_ = i;
      this.updateShape_();
      // Reconnect any child blocks.
      for (var i = 0; i < this.itemCount_; i++) {
        if (connections[i]) {
          this.getInput('ADD' + i).connection.connect(connections[i]);
        }
      }
    },
    /**
     * Store pointers to any connected child blocks.
     * @param {!Blockly.Block} containerBlock Root block in mutator.
     * @this Blockly.Block
     */
    saveConnections: function(containerBlock) {
      var itemBlock = containerBlock.getInputTargetBlock('STACK');
      var i = 0;
      while (itemBlock) {
        var input = this.getInput('ADD' + i);
        itemBlock.valueConnection_ = input && input.connection.targetConnection;
        i++;
        itemBlock = itemBlock.nextConnection &&
            itemBlock.nextConnection.targetBlock();
      }
    },
    /**
     * Modify this block to have the correct number of inputs.
     * @private
     * @this Blockly.Block
     */
    updateShape_: function() {
      // Delete everything.
      if (this.getInput('EMPTY')) {
        this.removeInput('EMPTY');
      } else {
        var i = 0;
        while (this.getInput('ADD' + i)) {
          this.removeInput('ADD' + i);
          i++;
        }
      }
      // Rebuild block.
      if (this.itemCount_ == 0) {
        this.appendDummyInput('EMPTY')
            .appendField(Blockly.Msg.TUPLE_CREATE_EMPTY_TITLE);
      } else {
        for (var i = 0; i < this.itemCount_; i++) {
          var input = this.appendValueInput('ADD' + i);
          if (i == 0) {
            input.appendField(Blockly.Msg.TUPLE_CREATE_WITH_INPUT_WITH);
          }
        }
      }
    },
    getVars: function() {
      return [this.getFieldValue('VAR')];
    },
    renameVar: function(oldName, newName) {
      if (Blockly.Names.equals(oldName, this.getFieldValue('VAR'))) {
        this.setTitleValue(newName, 'VAR');
      }
    }
  };
  
  Blockly.Blocks['tuple_get_sublist'] = {
      /**
       * Block for getting sublist.
       * @this Blockly.Block
       */
      init: function () {
          this.setHelpUrl(Blockly.Msg.LISTS_GET_SUBLIST_HELPURL);
          this.setColour(Blockly.Blocks.tuple.HUE);
          this.appendValueInput('LIST')
          this.appendDummyInput('')
          this.appendValueInput('AT1')
              .appendField(Blockly.MIXLY_MICROBIT_PY_STORAGE_GET + " " + Blockly.Msg.LISTS_GET_INDEX_FROM_START);
          this.appendValueInput('AT2')
              .appendField(Blockly.Msg.TEXT_CHARAT_TAIL + " " + Blockly.Msg.LISTS_GET_SUBLIST_END_FROM_START);
          this.appendDummyInput()
              .appendField(Blockly.Msg.TEXT_CHARAT_TAIL);
          this.setInputsInline(true);
          this.setOutput(true, 'Tuple');
          this.setTooltip(Blockly.Msg.PYTHON_TUPLE_GET_SUBLIST_TOOLTIP);
      }
  }
  
  Blockly.Blocks['tuple_get_random_item'] = {  
    init: function() {
      this.setColour(Blockly.Blocks.tuple.HUE);
    this.appendValueInput("TUP");
    this.appendDummyInput()
          .appendField(Blockly.MIXLY_MICROBIT_PY_STORAGE_GET + " " + Blockly.Msg.LISTS_GET_INDEX_RANDOM)
    this.setTooltip(Blockly.Msg.LISTS_GET_INDEX_TOOLTIP_GET_RANDOM);
    this.setOutput(true);
    }
  };
  
  Blockly.Blocks['tuple_totuple'] = {
    init: function () {
      this.setColour(Blockly.Blocks.tuple.HUE);
      this.appendValueInput('VAR')
      .appendField(Blockly.MIXLY_TOTUPLE);
      this.setOutput(true);
      this.setTooltip(Blockly.MIXLY_PYTHON_TOOLTIP_TOTUPLE);
    }
  };