// Copyright (c) 2014 Adobe Systems Incorporated. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
Snap.plugin(function (Snap, Element, Paper, glob, Fragment) {
    var rgNotSpace = /\S+/g,
        rgBadSpace = /[\t\r\n\f]/g,
        rgTrim = /(^\s+|\s+$)/g,
        Str = String,
        elproto = Element.prototype;
    /*\
     * Element.addClass
     [ method ]
     **
     * Adds given class name or list of class names to the element.
     - value (string) class name or space separated list of class names
     **
     = (Element) original element.
    \*/
    elproto.addClass = function (value) {
        var classes = Str(value || "").match(rgNotSpace) || [],
            elem = this.node,
            className = elem.className.baseVal,
            curClasses = className.match(rgNotSpace) || [],
            j,
            pos,
            clazz,
            finalValue;

        if (classes.length) {
            j = 0;
            while ((clazz = classes[j++])) {
                pos = curClasses.indexOf(clazz);
                if (!~pos) {
                    curClasses.push(clazz);
                }
            }

            finalValue = curClasses.join(" ");
            if (className != finalValue) {
                elem.className.baseVal = finalValue;
            }
        }
        return this;
    };
    /*\
     * Element.removeClass
     [ method ]
     **
     * Removes given class name or list of class names from the element.
     - value (string) class name or space separated list of class names
     **
     = (Element) original element.
    \*/
    elproto.removeClass = function (value) {
        var classes = Str(value || "").match(rgNotSpace) || [],
            elem = this.node,
            className = elem.className.baseVal,
            curClasses = className.match(rgNotSpace) || [],
            j,
            pos,
            clazz,
            finalValue;
        if (curClasses.length) {
            j = 0;
            while ((clazz = classes[j++])) {
                pos = curClasses.indexOf(clazz);
                if (~pos) {
                    curClasses.splice(pos, 1);
                }
            }

            finalValue = curClasses.join(" ");
            if (className != finalValue) {
                elem.className.baseVal = finalValue;
            }
        }
        return this;
    };
    /*\
     * Element.hasClass
     [ method ]
     **
     * Checks if the element has a given class name in the list of class names applied to it.
     - value (string) class name
     **
     = (boolean) `true` if the element has given class
    \*/
    elproto.hasClass = function (value) {
        var elem = this.node,
            className = elem.className.baseVal,
            curClasses = className.match(rgNotSpace) || [];
        return !!~curClasses.indexOf(value);
    };
    /*\
     * Element.toggleClass
     [ method ]
     **
     * Add or remove one or more classes from the element, depending on either
     * the class’s presence or the value of the `flag` argument.
     - value (string) class name or space separated list of class names
     - flag (boolean) value to determine whether the class should be added or removed
     **
     = (Element) original element.
    \*/
    elproto.toggleClass = function (value, flag) {
        if (flag != null) {
            if (flag) {
                return this.addClass(value);
            } else {
                return this.removeClass(value);
            }
        }
        var classes = (value || "").match(rgNotSpace) || [],
            elem = this.node,
            className = elem.className.baseVal,
            curClasses = className.match(rgNotSpace) || [],
            j,
            pos,
            clazz,
            finalValue;
        j = 0;
        while ((clazz = classes[j++])) {
            pos = curClasses.indexOf(clazz);
            if (~pos) {
                curClasses.splice(pos, 1);
            } else {
                curClasses.push(clazz);
            }
        }

        finalValue = curClasses.join(" ");
        if (className != finalValue) {
            elem.className.baseVal = finalValue;
        }
        return this;
    };
});