/**
 * @license
 * Visual Blocks Editor
 *
 * Copyright 2012 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 Logic blocks for Blockly.
 * @author q.neutron@gmail.com (Quynh Neutron)
 */
'use strict';

goog.provide('Blockly.Blocks.logic');

goog.require('Blockly.Blocks');
goog.require('Blockly.Types');


/**
 * Common HSV hue for all blocks in this category.
 */
Blockly.Blocks.logic.HUE = 210;

Blockly.Blocks['controls_if'] = {
  /**
   * Block for if/elseif/else condition.
   * @this Blockly.Block
   */
  init: function() {
    this.setHelpUrl(Blockly.Msg.CONTROLS_IF_HELPURL);
    this.setColour("#7365CF");
    this.appendValueInput('IF0')
        .setCheck(Blockly.Types.BOOLEAN.checkList)
        .appendField(Blockly.Msg.CONTROLS_IF_MSG_IF);
    this.appendStatementInput('DO0')
        .appendField(Blockly.Msg.CONTROLS_IF_MSG_THEN);
    this.setPreviousStatement(true);
    this.setNextStatement(true);
    this.setMutator(new Blockly.Mutator(['controls_if_elseif',
                                         'controls_if_else']));
    // Assign 'this' to a variable for use in the tooltip closure below.
    var thisBlock = this;
    this.setTooltip(function() {
      if (!thisBlock.elseifCount_ && !thisBlock.elseCount_) {
        return Blockly.Msg.CONTROLS_IF_TOOLTIP_1;
      } else if (!thisBlock.elseifCount_ && thisBlock.elseCount_) {
        return Blockly.Msg.CONTROLS_IF_TOOLTIP_2;
      } else if (thisBlock.elseifCount_ && !thisBlock.elseCount_) {
        return Blockly.Msg.CONTROLS_IF_TOOLTIP_3;
      } else if (thisBlock.elseifCount_ && thisBlock.elseCount_) {
        return Blockly.Msg.CONTROLS_IF_TOOLTIP_4;
      }
      return '';
    });
    this.elseifCount_ = 0;
    this.elseCount_ = 0;
  },
  /**
   * Create XML to represent the number of else-if and else inputs.
   * @return {Element} XML storage element.
   * @this Blockly.Block
   */
  mutationToDom: function() {
    if (!this.elseifCount_ && !this.elseCount_) {
      return null;
    }
    var container = document.createElement('mutation');
    if (this.elseifCount_) {
      container.setAttribute('elseif', this.elseifCount_);
    }
    if (this.elseCount_) {
      container.setAttribute('else', 1);
    }
    return container;
  },
  /**
   * Parse XML to restore the else-if and else inputs.
   * @param {!Element} xmlElement XML storage element.
   * @this Blockly.Block
   */
  domToMutation: function(xmlElement) {
    this.elseifCount_ = parseInt(xmlElement.getAttribute('elseif'), 10) || 0;
    this.elseCount_ = parseInt(xmlElement.getAttribute('else'), 10) || 0;
    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 = workspace.newBlock('controls_if_if');
    containerBlock.initSvg();
    var connection = containerBlock.nextConnection;
    for (var i = 1; i <= this.elseifCount_; i++) {
      var elseifBlock = workspace.newBlock('controls_if_elseif');
      elseifBlock.initSvg();
      connection.connect(elseifBlock.previousConnection);
      connection = elseifBlock.nextConnection;
    }
    if (this.elseCount_) {
      var elseBlock = workspace.newBlock('controls_if_else');
      elseBlock.initSvg();
      connection.connect(elseBlock.previousConnection);
    }
    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 clauseBlock = containerBlock.nextConnection.targetBlock();
    // Count number of inputs.
    this.elseifCount_ = 0;
    this.elseCount_ = 0;
    var valueConnections = [null];
    var statementConnections = [null];
    var elseStatementConnection = null;
    while (clauseBlock) {
      switch (clauseBlock.type) {
        case 'controls_if_elseif':
          this.elseifCount_++;
          valueConnections.push(clauseBlock.valueConnection_);
          statementConnections.push(clauseBlock.statementConnection_);
          break;
        case 'controls_if_else':
          this.elseCount_++;
          elseStatementConnection = clauseBlock.statementConnection_;
          break;
        default:
          throw 'Unknown block type.';
      }
      clauseBlock = clauseBlock.nextConnection &&
          clauseBlock.nextConnection.targetBlock();
    }
    this.updateShape_();
    // Reconnect any child blocks.
    for (var i = 1; i <= this.elseifCount_; i++) {
      Blockly.Mutator.reconnect(valueConnections[i], this, 'IF' + i);
      Blockly.Mutator.reconnect(statementConnections[i], this, 'DO' + i);
    }
    Blockly.Mutator.reconnect(elseStatementConnection, this, 'ELSE');
  },
  /**
   * Store pointers to any connected child blocks.
   * @param {!Blockly.Block} containerBlock Root block in mutator.
   * @this Blockly.Block
   */
  saveConnections: function(containerBlock) {
    var clauseBlock = containerBlock.nextConnection.targetBlock();
    var i = 1;
    while (clauseBlock) {
      switch (clauseBlock.type) {
        case 'controls_if_elseif':
          var inputIf = this.getInput('IF' + i);
          var inputDo = this.getInput('DO' + i);
          clauseBlock.valueConnection_ =
              inputIf && inputIf.connection.targetConnection;
          clauseBlock.statementConnection_ =
              inputDo && inputDo.connection.targetConnection;
          i++;
          break;
        case 'controls_if_else':
          var inputDo = this.getInput('ELSE');
          clauseBlock.statementConnection_ =
              inputDo && inputDo.connection.targetConnection;
          break;
        default:
          throw 'Unknown block type.';
      }
      clauseBlock = clauseBlock.nextConnection &&
          clauseBlock.nextConnection.targetBlock();
    }
  },
  /**
   * Modify this block to have the correct number of inputs.
   * @private
   * @this Blockly.Block
   */
  updateShape_: function() {
    // Delete everything.
    if (this.getInput('ELSE')) {
      this.removeInput('ELSE');
    }
    var i = 1;
    while (this.getInput('IF' + i)) {
      this.removeInput('IF' + i);
      this.removeInput('DO' + i);
      i++;
    }
    // Rebuild block.
    for (var i = 1; i <= this.elseifCount_; i++) {
      this.appendValueInput('IF' + i)
          .setCheck('Boolean')
          .appendField(Blockly.Msg.CONTROLS_IF_MSG_ELSEIF);
      this.appendStatementInput('DO' + i)
          .appendField(Blockly.Msg.CONTROLS_IF_MSG_THEN);
    }
    if (this.elseCount_) {
      this.appendStatementInput('ELSE')
          .appendField(Blockly.Msg.CONTROLS_IF_MSG_ELSE);
    }
  }
};

Blockly.Blocks['controls_if_if'] = {
  /**
   * Mutator block for if container.
   * @this Blockly.Block
   */
  init: function() {
    this.setColour("#7365CF");
    this.appendDummyInput()
        .appendField(Blockly.Msg.CONTROLS_IF_IF_TITLE_IF);
    this.setNextStatement(true);
    this.setTooltip(Blockly.Msg.CONTROLS_IF_IF_TOOLTIP);
    this.contextMenu = false;
  }
};

Blockly.Blocks['controls_if_elseif'] = {
  /**
   * Mutator bolck for else-if condition.
   * @this Blockly.Block
   */
  init: function() {
    this.setColour("#7365CF");
    this.appendDummyInput()
        .appendField(Blockly.Msg.CONTROLS_IF_ELSEIF_TITLE_ELSEIF);
    this.setPreviousStatement(true);
    this.setNextStatement(true);
    this.setTooltip(Blockly.Msg.CONTROLS_IF_ELSEIF_TOOLTIP);
    this.contextMenu = false;
  }
};

Blockly.Blocks['controls_if_else'] = {
  /**
   * Mutator block for else condition.
   * @this Blockly.Block
   */
  init: function() {
    this.setColour("#7365CF");
    this.appendDummyInput()
        .appendField(Blockly.Msg.CONTROLS_IF_ELSE_TITLE_ELSE);
    this.setPreviousStatement(true);
    this.setTooltip(Blockly.Msg.CONTROLS_IF_ELSE_TOOLTIP);
    this.contextMenu = false;
  }
};

Blockly.Blocks['logic_compare'] = {
  /**
   * Block for comparison operator.
   * @this Blockly.Block
   */
  init: function() {
    var OPERATORS = this.RTL ? [
          ['=', 'EQ'],
          ['\u2260', 'NEQ'],
          ['>', 'LT'],
          ['\u2265', 'LTE'],
          ['<', 'GT'],
          ['\u2264', 'GTE']
        ] : [
          ['=', 'EQ'],
          ['\u2260', 'NEQ'],
          ['<', 'LT'],
          ['\u2264', 'LTE'],
          ['>', 'GT'],
          ['\u2265', 'GTE']
        ];
    this.setHelpUrl(Blockly.Msg.LOGIC_COMPARE_HELPURL);
    this.setColour("#7365CF");
    this.setOutput(true, Blockly.Types.BOOLEAN.output);
    this.appendValueInput('A');
    this.appendValueInput('B')
        .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 op = thisBlock.getFieldValue('OP');
      var TOOLTIPS = {
        'EQ': Blockly.Msg.LOGIC_COMPARE_TOOLTIP_EQ,
        'NEQ': Blockly.Msg.LOGIC_COMPARE_TOOLTIP_NEQ,
        'LT': Blockly.Msg.LOGIC_COMPARE_TOOLTIP_LT,
        'LTE': Blockly.Msg.LOGIC_COMPARE_TOOLTIP_LTE,
        'GT': Blockly.Msg.LOGIC_COMPARE_TOOLTIP_GT,
        'GTE': Blockly.Msg.LOGIC_COMPARE_TOOLTIP_GTE
      };
      return TOOLTIPS[op];
    });
    this.prevBlocks_ = [null, null];
  },
  /**
   * Called whenever anything on the workspace changes.
   * Prevent mismatched types from being compared.
   * @param {!Blockly.Events.Abstract} e Change event.
   * @this Blockly.Block
   */
  onchange: function(e) {
    var blockA = this.getInputTargetBlock('A');
    var blockB = this.getInputTargetBlock('B');
    // Disconnect blocks that existed prior to this change if they don't match.
    if (blockA && blockB &&
        !blockA.outputConnection.checkType_(blockB.outputConnection)) {
      // Mismatch between two inputs.  Disconnect previous and bump it away.
      // Ensure that any disconnections are grouped with the causing event.
      Blockly.Events.setGroup(e.group);
      for (var i = 0; i < this.prevBlocks_.length; i++) {
        var block = this.prevBlocks_[i];
        if (block === blockA || block === blockB) {
          block.unplug();
          block.bumpNeighbours_();
        }
      }
      Blockly.Events.setGroup(false);
    }
    this.prevBlocks_[0] = blockA;
    this.prevBlocks_[1] = blockB;
  },
  /** Assigns a type to the block, comparison operations result in booleans. */
  getBlockType: function() {
    return Blockly.Types.BOOLEAN;
  }
};

Blockly.Blocks['logic_operation'] = {
  /**
   * Block for logical operations: 'and', 'or'.
   * @this Blockly.Block
   */
  init: function() {
    var OPERATORS =
        [[Blockly.Msg.LOGIC_OPERATION_AND, 'AND'],
         [Blockly.Msg.LOGIC_OPERATION_OR, 'OR']];
    this.setHelpUrl(Blockly.Msg.LOGIC_OPERATION_HELPURL);
    this.setColour("#7365CF");
    this.setOutput(true, Blockly.Types.BOOLEAN.output);
    this.appendValueInput('A')
        .setCheck(Blockly.Types.BOOLEAN.checkList);
    this.appendValueInput('B')
        .setCheck(Blockly.Types.BOOLEAN.checkList)
        .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 op = thisBlock.getFieldValue('OP');
      var TOOLTIPS = {
        'AND': Blockly.Msg.LOGIC_OPERATION_TOOLTIP_AND,
        'OR': Blockly.Msg.LOGIC_OPERATION_TOOLTIP_OR
      };
      return TOOLTIPS[op];
    });
  },
  /** Assigns a block type, logic comparison operations result in bools. */
  getBlockType: function() {
    return Blockly.Types.BOOLEAN;
  }
};

Blockly.Blocks['logic_negate'] = {
  /**
   * Block for negation.
   * @this Blockly.Block
   */
  init: function() {
    this.jsonInit({
      "message0": Blockly.Msg.LOGIC_NEGATE_TITLE,
      "args0": [
        {
          "type": "input_value",
          "name": "BOOL",
          "check": Blockly.Types.BOOLEAN.checkList
        }
      ],
      "output": Blockly.Types.BOOLEAN.output,
      "colour": "#7365CF",
      "tooltip": Blockly.Msg.LOGIC_NEGATE_TOOLTIP,
      "helpUrl": Blockly.Msg.LOGIC_NEGATE_HELPURL
    });
  },
  /** Assigns block type, 'block input' is meant to be a boolean, so same. */
  getBlockType: function() {
    return Blockly.Types.BOOLEAN;
  }
};

Blockly.Blocks['logic_boolean'] = {
  /**
   * Block for boolean data type: true and false.
   * @this Blockly.Block
   */
  init: function() {
    this.jsonInit({
      "message0": "%1",
      "args0": [
        {
          "type": "field_dropdown",
          "name": "BOOL",
          "options": [
            [Blockly.Msg.LOGIC_BOOLEAN_TRUE, "TRUE"],
            [Blockly.Msg.LOGIC_BOOLEAN_FALSE, "FALSE"]
          ]
        }
      ],
      "output": Blockly.Types.BOOLEAN.output,
      "colour": "#7365CF",
      "tooltip": Blockly.Msg.LOGIC_BOOLEAN_TOOLTIP,
      "helpUrl": Blockly.Msg.LOGIC_BOOLEAN_HELPURL
    });
  },
  /** Assigns a type to the boolean block. */
  getBlockType: function() {
    return Blockly.Types.BOOLEAN;
  }
};

Blockly.Blocks['logic_null'] = {
  /**
   * Block for null data type.
   * @this Blockly.Block
   */
  init: function() {
    this.jsonInit({
      "message0": Blockly.Msg.LOGIC_NULL,
      "output": Blockly.Types.NULL.output,
      "colour": "#7365CF",
      "tooltip": Blockly.Msg.LOGIC_NULL_TOOLTIP,
      "helpUrl": Blockly.Msg.LOGIC_NULL_HELPURL
    });
  },
  /** Assigns a type to the NULL block. */
  getBlockType: function() {
    return Blockly.Types.NULL;
  }
};

Blockly.Blocks['logic_ternary'] = {
  /**
   * Block for ternary operator.
   * @this Blockly.Block
   */
  init: function() {
    this.setHelpUrl(Blockly.Msg.LOGIC_TERNARY_HELPURL);
    this.setColour("#7365CF");
    this.appendValueInput('IF')
        .setCheck(Blockly.Types.BOOLEAN.checkList)
        .appendField(Blockly.Msg.LOGIC_TERNARY_CONDITION);
    this.appendValueInput('THEN')
        .appendField(Blockly.Msg.LOGIC_TERNARY_IF_TRUE);
    this.appendValueInput('ELSE')
        .appendField(Blockly.Msg.LOGIC_TERNARY_IF_FALSE);
    this.setOutput(true);
    this.setTooltip(Blockly.Msg.LOGIC_TERNARY_TOOLTIP);
    this.prevParentConnection_ = null;
  },
  /**
   * Called whenever anything on the workspace changes.
   * Prevent mismatched types.
   * @param {!Blockly.Events.Abstract} e Change event.
   * @this Blockly.Block
   */
  onchange: function(e) {
    var blockA = this.getInputTargetBlock('THEN');
    var blockB = this.getInputTargetBlock('ELSE');
    var parentConnection = this.outputConnection.targetConnection;
    // Disconnect blocks that existed prior to this change if they don't match.
    if ((blockA || blockB) && parentConnection) {
      for (var i = 0; i < 2; i++) {
        var block = (i == 1) ? blockA : blockB;
        if (block && !block.outputConnection.checkType_(parentConnection)) {
          // Ensure that any disconnections are grouped with the causing event.
          Blockly.Events.setGroup(e.group);
          if (parentConnection === this.prevParentConnection_) {
            this.unplug();
            parentConnection.getSourceBlock().bumpNeighbours_();
          } else {
            block.unplug();
            block.bumpNeighbours_();
          }
          Blockly.Events.setGroup(false);
        }
      }
    }
    this.prevParentConnection_ = parentConnection;
  }
  //TODO: getBlockType that uses the type of the given inputs
};
