/* vim:ts=4:sts=4:sw=4:
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Ajax.org Code Editor (ACE).
 *
 * The Initial Developer of the Original Code is
 * Ajax.org B.V.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *      Fabian Jakobs <fabian AT ajax DOT org>
 *      Mihai Sucan <mihai AT sucan AT gmail ODT com>
 *      Irakli Gozalishvili <rfobic@gmail.com> (http://jeditoolkit.com)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

define(function(require, exports, module) {
"use strict";

var XHTML_NS = "http://www.w3.org/1999/xhtml";

exports.createElement = function(tag, ns) {
    return document.createElementNS ?
           document.createElementNS(ns || XHTML_NS, tag) :
           document.createElement(tag);
};

exports.setText = function(elem, text) {
    if (elem.innerText !== undefined) {
        elem.innerText = text;
    }
    if (elem.textContent !== undefined) {
        elem.textContent = text;
    }
};

exports.hasCssClass = function(el, name) {
    var classes = el.className.split(/\s+/g);
    return classes.indexOf(name) !== -1;
};

/*
* Add a CSS class to the list of classes on the given node
*/
exports.addCssClass = function(el, name) {
    if (!exports.hasCssClass(el, name)) {
        el.className += " " + name;
    }
};

/*
* Remove a CSS class from the list of classes on the given node
*/
exports.removeCssClass = function(el, name) {
    var classes = el.className.split(/\s+/g);
    while (true) {
        var index = classes.indexOf(name);
        if (index == -1) {
            break;
        }
        classes.splice(index, 1);
    }
    el.className = classes.join(" ");
};

exports.toggleCssClass = function(el, name) {
    var classes = el.className.split(/\s+/g), add = true;
    while (true) {
        var index = classes.indexOf(name);
        if (index == -1) {
            break;
        }
        add = false;
        classes.splice(index, 1);
    }
    if(add)
        classes.push(name);

    el.className = classes.join(" ");
    return add;
};

/*
 * Add or remove a CSS class from the list of classes on the given node
 * depending on the value of <tt>include</tt>
 */
exports.setCssClass = function(node, className, include) {
    if (include) {
        exports.addCssClass(node, className);
    } else {
        exports.removeCssClass(node, className);
    }
};

exports.hasCssString = function(id, doc) {
    var index = 0, sheets;
    doc = doc || document;

    if (doc.createStyleSheet && (sheets = doc.styleSheets)) {
        while (index < sheets.length)
            if (sheets[index++].owningElement.id === id) return true;
    } else if ((sheets = doc.getElementsByTagName("style"))) {
        while (index < sheets.length)
            if (sheets[index++].id === id) return true;
    }

    return false;
};

exports.importCssString = function importCssString(cssText, id, doc) {
    doc = doc || document;
    // If style is already imported return immediately.
    if (id && exports.hasCssString(id, doc))
        return null;
    
    var style;
    
    if (doc.createStyleSheet) {
        style = doc.createStyleSheet();
        style.cssText = cssText;
        if (id)
            style.owningElement.id = id;
    } else {
        style = doc.createElementNS
            ? doc.createElementNS(XHTML_NS, "style")
            : doc.createElement("style");

        style.appendChild(doc.createTextNode(cssText));
        if (id)
            style.id = id;

        var head = doc.getElementsByTagName("head")[0] || doc.documentElement;
        head.appendChild(style);
    }
};

exports.importCssStylsheet = function(uri, doc) {
    if (doc.createStyleSheet) {
        doc.createStyleSheet(uri);
    } else {
        var link = exports.createElement('link');
        link.rel = 'stylesheet';
        link.href = uri;

        var head = doc.getElementsByTagName("head")[0] || doc.documentElement;
        head.appendChild(link);
    }
};

exports.getInnerWidth = function(element) {
    return (
        parseInt(exports.computedStyle(element, "paddingLeft"), 10) +
        parseInt(exports.computedStyle(element, "paddingRight"), 10) + 
        element.clientWidth
    );
};

exports.getInnerHeight = function(element) {
    return (
        parseInt(exports.computedStyle(element, "paddingTop"), 10) +
        parseInt(exports.computedStyle(element, "paddingBottom"), 10) +
        element.clientHeight
    );
};

if (window.pageYOffset !== undefined) {
    exports.getPageScrollTop = function() {
        return window.pageYOffset;
    };

    exports.getPageScrollLeft = function() {
        return window.pageXOffset;
    };
}
else {
    exports.getPageScrollTop = function() {
        return document.body.scrollTop;
    };

    exports.getPageScrollLeft = function() {
        return document.body.scrollLeft;
    };
}

if (window.getComputedStyle)
    exports.computedStyle = function(element, style) {
        if (style)
            return (window.getComputedStyle(element, "") || {})[style] || "";
        return window.getComputedStyle(element, "") || {};
    };
else
    exports.computedStyle = function(element, style) {
        if (style)
            return element.currentStyle[style];
        return element.currentStyle;
    };

exports.scrollbarWidth = function(document) {

    var inner = exports.createElement("p");
    inner.style.width = "100%";
    inner.style.minWidth = "0px";
    inner.style.height = "200px";

    var outer = exports.createElement("div");
    var style = outer.style;

    style.position = "absolute";
    style.left = "-10000px";
    style.overflow = "hidden";
    style.width = "200px";
    style.minWidth = "0px";
    style.height = "150px";

    outer.appendChild(inner);

    var body = document.body || document.documentElement;
    body.appendChild(outer);

    var noScrollbar = inner.offsetWidth;

    style.overflow = "scroll";
    var withScrollbar = inner.offsetWidth;

    if (noScrollbar == withScrollbar) {
        withScrollbar = outer.clientWidth;
    }

    body.removeChild(outer);

    return noScrollbar-withScrollbar;
};

/*
 * Optimized set innerHTML. This is faster than plain innerHTML if the element
 * already contains a lot of child elements.
 *
 * See http://blog.stevenlevithan.com/archives/faster-than-innerhtml for details
 */
exports.setInnerHtml = function(el, innerHtml) {
    var element = el.cloneNode(false);//document.createElement("div");
    element.innerHTML = innerHtml;
    el.parentNode.replaceChild(element, el);
    return element;
};

exports.setInnerText = function(el, innerText) {
    var document = el.ownerDocument;
    if (document.body && "textContent" in document.body)
        el.textContent = innerText;
    else
        el.innerText = innerText;

};

exports.getInnerText = function(el) {
    var document = el.ownerDocument;
    if (document.body && "textContent" in document.body)
        return el.textContent;
    else
         return el.innerText || el.textContent || "";
};

exports.getParentWindow = function(document) {
    return document.defaultView || document.parentWindow;
};

});