// Copyright (c) 2010 Javier Aguilar
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

(function($) {
    $.font = {
        version: '0.9.8',
        settings: {
            units: '%',
            defaultSize: 75, //75% equals to 12px and 1em, therefore 2em = 24px
            currentSize: 75,
            maxSize: 150,
            minSize: 40,
            zoomStep: 10
        },
        zoom: function(newSize, element) {
            element = $(element).get(0) || document.body;
            newSize = (isNaN(newSize) || (newSize > this.settings.maxSize) || (newSize < this.settings.minSize))
                ? this.settings.defaultSize : newSize;
            if ((this.settings.units != 'em') || (this.settings.units != '%')) {
                this.settings.units = '%';
            }
            if (element.style != undefined) {
                element.style.fontSize = newSize + this.settings.units;
                this.settings.currentSize = parseInt(newSize);
            }
            return this.settings.currentSize;
        },
        zoomIn: function(element) {
            element = element || document.body;
            if (this.settings.currentSize <= this.settings.maxSize) {
                this.settings.currentSize += this.settings.zoomStep;
                this.zoom(this.settings.currentSize, element);
            } else {
                this.zoom(this.settings.defaultSize, element);
            }
            return this.settings.currentSize;
        },
        zoomOut: function(element) {
            element = element || document.body;
            if (this.settings.currentSize >= this.settings.minSize) {
                this.settings.currentSize -= this.settings.zoomStep;
                this.zoom(this.settings.currentSize, element);
            } else {
                this.zoom(this.settings.defaultSize, element);
            }
            return this.settings.currentSize;
        }
    }
    $.fn.fontZoom = function(newSize) {
        $.font.zoom(newSize, this);
        return this;
    }
    $.fn.fontZoomIn = function() {
        $.font.zoomIn(this);
        return this;
    }
    $.fn.fontZoomOut = function() {
        $.font.zoomOut(this);
        return this;
    }
})(jQuery);