'use strict';

/*@
Ox.$ <f> Generic HTML element, mimics jQuery
    (str) -> <o> Element object
    str <s> Tagname ('<tagname>') or selector ('tagname', '.classname', '#id')
    > Ox.$('<div>').addClass('red').hasClass('red')
    true
    > Ox.$('<div>').addClass('red').removeClass('red').hasClass('red')
    false
    > Ox.$('<div>').addClass('red').addClass('red')[0].className
    'red'
    > Ox.$('<div>').attr({id: 'red'}).attr('id')
    'red'
    > Ox.$('<div>').attr({id: 'red'}).removeAttr('id').attr('id')
    void 0
    > Ox.$('<div>').css({color: 'red'}).css('color')
    'red'
    > Ox.$('<div>').html('red').html()
    'red'
    > Ox.$('<div>').html('red').empty().html()
    ''
    > Ox.$('<input>').val('red').val()
    'red'
@*/
Ox.$ = Ox.element = function(value) {
    var element = !Ox.isString(value) ? value // window or document
        : value[0] == '<' ? document.createElement(value.slice(1, -1))
        : value[0] == '#' ? document.getElementById(value.slice(1))
        : value[0] == '.' ? document.getElementsByClassName(value.slice(1))[0]
        : document.getElementsByTagName(value)[0];
    return element ? {
        //@ 0 <e> The DOM element itself
        0: element,
        /*@
        addClass <f> Adds a class name
            (className) -> <o> This element
            className <s> Class name
        @*/
        addClass: function(string) {
            this[0].className = Ox.unique(((
                this[0].className ? this[0].className + ' ' : ''
            ) + Ox.clean(string)).split(' ')).join(' ');
            return this;
        },
        /*@
        append <f> Appends another element to this element
            (element) -> <o> This element
            element <o|[o]> One or more elements
        @*/
        append: function() {
            var that = this;
            Ox.makeArray(arguments[0]).forEach(function(element) {
                that[0].appendChild(element[0]);                
            });
            return this;
        },
        /*@
        appendTo <f> appends this element object to another element object
            (element) -> <o> This element
            element <o> Another element
        @*/
        appendTo: function(element) {
            element[0].appendChild(this[0]);
            return this;
        },
        /*@
        attr <f> Gets or sets an attribute
            (key) -> <s> Value
            (key, value) -> <o> This element
            ({key: value, key1: value1, ...}) -> <o> This element
            key   <str> Attribute name
            value <str> Attribute value
        @*/
        attr: function() {
            var ret, that = this;
            if (arguments.length == 1 && Ox.isString(arguments[0])) {
                ret = this[0].getAttribute(arguments[0]);
                if (ret === null) {
                    ret = void 0;
                }
            } else {
                Ox.forEach(Ox.makeObject(arguments), function(value, key) {
                    that[0].setAttribute(key, value);
                });
                ret = this;
            }
            return ret;
        },
        /*@
        css <f> Gets or sets a CSS attribute
            (key) -> <s> Value
            (key, value) -> <o> This element
            ({key0: value0, key1: value1, ...}) -> <o> This element
            key <str> Attribute name
            value <str> Attribute value
        @*/
        css: function() {
            var ret, that = this;
            if (arguments.length == 1 && Ox.isString(arguments[0])) {
                ret = this[0].style[arguments[0]];
            } else {
                Ox.forEach(Ox.makeObject(arguments), function(value, key) {
                    that[0].style[key] = value;
                });
                ret = this;
            }
            return ret;
        },
        /*@
        empty <f> Empties the inner HTML
            () -> <o> This element
        @*/
        empty: function() {
            return this.html('');
        },
        /*@
        hasClass <f> Returns true if this element has a given class
            (className) -> <b> True if this element has the class
            className <s> Class name
        @*/
        hasClass: function(string) {
            return this[0].className.split(' ').indexOf(string) > -1;
        },
        /*@
        height <f> Returns the height of this element
            () -> <n> Height in px
        @*/
        height: function() {
            return this[0].offsetHeight;
        },
        /*@
        hide <f> Hides this element
            () -> <o> This element
        @*/
        hide: function() {
            return this.css({display: 'none'});
        },
        /*@
        html <f> Gets or sets the inner HTML
            () -> <s> The inner HTML
            (html) -> <o> This element
            html <s> The inner HTML
        @*/
        html: function(string) {
            var ret;
            if (arguments.length == 0) {
                ret = this[0].innerHTML;
            } else {
                this[0].innerHTML = string;
                ret = this;
            }
            return ret;
        },
        /*@
        on <f> Binds a callback to an event
            (event, callback) -> <o> This element
            ({event0: callback0, event1: callback1, ...}) -> <o> This element
            event <s> Event name
            callback <f> Callback function
                e <o> Event properties
        @*/
        on: function() {
            var that = this;
            Ox.forEach(Ox.makeObject(arguments), function(callback, event) {
                that[0].addEventListener(event, callback);
            });
            return this;
        },
        /*@
        one <f> Binds a callback to an event and unbinds it on first invocation
            (event, callback) -> <o> This element
            ({event0: callback0, event1: callback1, ...}) -> <o> This element
            event <s> Event name
            callback <f> Callback function
                e <o> Event properties
        @*/
        one: function(events) {
            var that = this;
            Ox.forEach(Ox.makeObject(arguments), function(callback, event) {
                that.on(event, function fn() {
                    that.off(event, fn);
                    callback();
                });
            });
            return this;
        },
        /*@
        off <f> Unbinds a callback from an event
            (event) -> <o> This element (unbinds all callbacks)
            (event, callback) -> <o> This element
            ({event0: callback0, event1: callback1, ...}) -> <o> This element
            event <s> Event name
            callback <f> Callback function
        @*/
        off: function(event, callback) {
            var that = this;
            Ox.forEach(Ox.makeObject(arguments), function(callback, event) {
                if (callback) {
                    that[0].removeEventListener(event, callback);
                } else {
                    that[0]['on' + event] = null;
                }
            });
            return this;
        },
        /*@
        remove <f> Removes this element from the DOM
            () -> <o> This element
        @*/
        remove: function() {
            this[0].parentNode.removeChild(this[0]);
            return this;
        },
        /*@
        removeAttr <f> Removes an attribute
            (key) -> <o> This element
            ([key0, key1, ...]) -> <o> This element
            key <s> The attribute
        @*/
        removeAttr: function() {
            var that = this;
            Ox.makeArray(arguments[0]).forEach(function(key) {
                that[0].removeAttribute(key);
            });
            return this;
        },
        /*@
        removeClass <f> Removes a class name
            (className) -> <o> This element
            className <s> Class name
        @*/
        removeClass: function(string) {
            var array = Ox.clean(string).split(' ');
            this[0].className = this[0].className.split(' ').filter(
                function(className) {
                    return array.indexOf(className) == -1;
                }
            ).join(' ');
            return this;
        },
        /*@
        show <f> Show this element
            () -> This element
        @*/
        show: function() {
            return this.css({display: 'block'});
        },
        /*@
        val <f> Gets or sets the value property of this element
            () -> <s> Value
            (value) -> <o> This element
            value <s> Value
        @*/
        val: function(value) {
            var ret;
            if (arguments.length == 0) {
                return this[0].value;
            } else {
                this[0].value = value;
                ret = this;
            }
            return ret;
        },
        /*@
        width <f> Returns the width of this element
            () -> <n> Width in px
        @*/
        width: function() {
            return this[0].offsetWidth;            
        }
    } : null;
};

/*@
Ox.canvas <function> Generic canvas object
    # Description --------------------------------------------------------------
    Returns an object with the properties: <code>canvas</code>,
    <code>context</code>, <code>data</code> and <code>imageData</code>.
    # Usage --------------------------------------------------------------------
    Ox.canvas(width, height) -> <object> canvas
    Ox.canvas(image)         -> <object> canvas
    # Arguments ----------------------------------------------------------------
    width  <n> Width in px
    height <n> Height in px
    image  <e> Image object
@*/

Ox.canvas = function() {
    var c = {}, isImage = arguments.length == 1,
        image = isImage ? arguments[0] : {
            width: arguments[0], height: arguments[1]
        };
    c.context = (c.canvas = Ox.$('<canvas>').attr({
        width: image.width, height: image.height
    })[0]).getContext('2d');
    isImage && c.context.drawImage(image, 0, 0);
    c.data = (c.imageData = c.context.getImageData(
        0, 0, image.width, image.height
    )).data;
    return c;
};

/*@
Ox.documentReady <function> Calls a callback function once the DOM is ready
    (callback) -> <b> If true, the document was ready
    callback <f> Callback function
@*/
Ox.documentReady = (function() {
    var callbacks = [];
    document.onreadystatechange = function() {
        if (document.readyState == 'complete') {
            callbacks.forEach(function(callback) {
                callback();
            });
        }
    };
    return function(callback) {
        if (document.readyState == 'complete') {
            callback();
            return true;
        } else {
            callbacks.push(callback);
            return false;
        }
    };
}());