(function () {
  'use strict';

  /* globals jQuery */
  /*
   * ext-helloworld.js
   *
   * Licensed under the MIT License
   *
   * Copyright(c) 2010 Alexis Deveria
   *
   */

  /*
    This is a very basic SVG-Edit extension. It adds a "Hello World" button in
    the left panel. Clicking on the button, and then the canvas will show the
    user the point on the canvas that was clicked on.
  */

  svgEditor.addExtension('Hello World', function () {
    var $ = jQuery;
    var svgCanvas = svgEditor.canvas;
    return {
      name: 'Hello World',
      // For more notes on how to make an icon file, see the source of
      // the helloworld-icon.xml
      svgicons: svgEditor.curConfig.extIconsPath + 'helloworld-icon.xml',

      // Multiple buttons can be added in this array
      buttons: [{
        // Must match the icon ID in helloworld-icon.xml
        id: 'hello_world',

        // This indicates that the button will be added to the "mode"
        // button panel on the left side
        type: 'mode',

        // Tooltip text
        title: "Say 'Hello World'",

        // Events
        events: {
          click: function click() {
            // The action taken when the button is clicked on.
            // For "mode" buttons, any other button will
            // automatically be de-pressed.
            svgCanvas.setMode('hello_world');
          }
        }
      }],
      // This is triggered when the main mouse button is pressed down
      // on the editor canvas (not the tool panels)
      mouseDown: function mouseDown() {
        // Check the mode on mousedown
        if (svgCanvas.getMode() === 'hello_world') {
          // The returned object must include "started" with
          // a value of true in order for mouseUp to be triggered
          return { started: true };
        }
      },


      // This is triggered from anywhere, but "started" must have been set
      // to true (see above). Note that "opts" is an object with event info
      mouseUp: function mouseUp(opts) {
        // Check the mode on mouseup
        if (svgCanvas.getMode() === 'hello_world') {
          var zoom = svgCanvas.getZoom();

          // Get the actual coordinate by dividing by the zoom value
          var x = opts.mouse_x / zoom;
          var y = opts.mouse_y / zoom;

          var text = 'Hello World!\n\nYou clicked here: ' + x + ', ' + y;

          // Show the text using the custom alert function
          $.alert(text);
        }
      }
    };
  });

}());