/* ***** BEGIN LICENSE BLOCK *****
 * Distributed under the BSD license:
 *
 * Copyright (c) 2010, Ajax.org B.V.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * 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 Ajax.org B.V. nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * ***** END LICENSE BLOCK ***** */

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

if (typeof document == "undefined")
    return;

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

exports.getDocumentHead = function(doc) {
    if (!doc)
        doc = document;
    return doc.head || doc.getElementsByTagName("head")[0] || doc.documentElement;
}

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

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;

        exports.getDocumentHead(doc).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;

        exports.getDocumentHead(doc).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("ace_inner");
    inner.style.width = "100%";
    inner.style.minWidth = "0px";
    inner.style.height = "200px";
    inner.style.display = "block";

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

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

    outer.appendChild(inner);

    var 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;
};

if ("textContent" in document.documentElement) {
    exports.setInnerText = function(el, innerText) {
        el.textContent = innerText;
    };

    exports.getInnerText = function(el) {
        return el.textContent;
    };
}
else {
    exports.setInnerText = function(el, innerText) {
        el.innerText = innerText;
    };

    exports.getInnerText = function(el) {
        return el.innerText;
    };
}

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

});