/* <copyright>
Copyright (c) 2012, Motorola Mobility LLC.
All Rights Reserved.

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modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

* Neither the name of Motorola Mobility LLC nor the names of its
  contributors may be used to endorse or promote products derived from this
  software without specific prior written permission.

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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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</copyright> */
/*global require, exports */

/**
    @module montage/ui/check-input
    @requires montage/ui/component
    @requires montage/ui/native-control
    @requires montage/ui/composer/press-composer
*/
var Montage = require("montage").Montage,
    Component = require("ui/component").Component,
    NativeControl = require("ui/native-control").NativeControl,
    PressComposer = require("ui/composer/press-composer").PressComposer;

/**
    The base class for the Checkbox component. You will not typically create this class directly but instead use the Checkbox component.
    @class module:montage/ui/check-input.CheckInput
    @extends module:montage/ui/native-control.NativeControl
    @see module:"montage/ui/input-checkbox.reel".CheckBox
*/
var CheckInput = exports.CheckInput =  Montage.create(NativeControl, {

    // HTMLInputElement methods

    blur: { value: function() { this._element.blur(); } },
    focus: { value: function() { this._element.focus(); } },
    // click() deliberately omitted, use checked = instead

    // Callbacks
    draw: {
        value: function() {
            // Call super
            NativeControl.draw.call(this);
            this._element.setAttribute("aria-checked", this._checked);
        }
    },

    _pressComposer: {
        enumerable: false,
        value: null
    },

    prepareForActivationEvents: {
        value: function() {
            var pressComposer = this._pressComposer = PressComposer.create();
            this.addComposer(pressComposer);
            pressComposer.addEventListener("pressStart", this, false);
            pressComposer.addEventListener("press", this, false);
        }
    },

    prepareForDraw: {
        enumerable: false,
        value: function() {
            this._element.addEventListener('change', this);
        }
    },

    /**
    Fake the checking of the element.

    Changes the checked property of the element and dispatches a change event.
    Radio button overrides this.

    @private
    */
    _fakeCheck: {
        enumerable: false,
        value: function() {
            var changeEvent;
            // NOTE: this may be BAD, modifying the element outside of
            // the draw loop, but it's what a click/touch would
            // actually have done
            this._element.checked = !this._element.checked;
            changeEvent = document.createEvent("HTMLEvents");
            changeEvent.initEvent("change", true, true);
            this._element.dispatchEvent(changeEvent);
        }
    },

    /**
    Stores if we need to "fake" checking of the input element.

    When preventDefault is called on touchstart and touchend events (e.g. by
    the scroller component) the checkbox doesn't check itself, so we need
    to fake it later.

    @default false
    @private
    */
    _shouldFakeCheck: {
        enumerable: false,
        value: false
    },

    // Handlers

    handlePressStart: {
        value: function(event) {
            this._shouldFakeCheck = event.defaultPrevented;
        }
    },


    handlePress: {
        value: function(event) {
            if (this._shouldFakeCheck) {
                this._shouldFakeCheck = false;
                this._fakeCheck();
            }
        }
    },

    handleChange: {
        enumerable: false,
        value: function(event) {
            if (!this._pressComposer || this._pressComposer.state !== PressComposer.CANCELLED) {
                Object.getPropertyDescriptor(this, "checked").set.call(this,
                    this.element.checked, true);
                this._dispatchActionEvent();
            }
        }
    }
});