/* globals Gui, Polymer, PathObserver */
'use strict';

/*

[ ] onChange()
[ ] onFinishChange()

*/
Polymer('controller-base', {

  ready: function() {

    this.update();

  },

  update: function() {},

  init: function() {},

  // Observers
  // -------------------------------

  watch: function(object, path) {

    this.object = object;
    this.path = path;

    this.bind('value', new PathObserver(this.object, this.path));

  },
  
  valueChanged: function() {
      
    this.update();
    this.fire( 'change', this.value );

  },

  // Helpers
  // -------------------------------

  on: function( event, listener ) {
    this.addEventListener( event, listener );
    return this;
  },
  
  map: function(x, a, b, c, d) {
    return (x - a) / (b - a) * (d - c) + c;
  },

  // Legacy
  // -------------------------------

  listen: function() {

    Gui.warn('controller.listen() is deprecated. ' +
             'All controllers are listened for free.');
    return this;

  },

  getValue: function() {

    return this.value;

  },

  setValue: function(v) {

    this.value = v;
    return this;

  },

  onChange: function( v ) {

    this.addEventListener( 'change', function( e ) {
      v( e.detail );
    } );
    return this;

  },
        
});