(function () {

    /*!
    * secure-filters from https://github.com/salesforce/secure-filters/blob/master/lib/secure-filters.js
    * license: BSD-3-Clause https://github.com/salesforce/secure-filters/blob/master/LICENSE.txt
    * */
    function convertControlCharacters(str) {
        return String(str).replace(/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F]/g, ' ');
    };
    var secureFilters = {};
    secureFilters.css = function(val) {
        var str = String(val);
        str = convertControlCharacters(str);
        return str.replace(/[^a-zA-Z0-9\uD800-\uDFFF]/g, function(match) {
            var code = match.charCodeAt(0);
            if (code === 0) {
                return '\\fffd '; // REPLACEMENT CHARACTER U+FFFD
            } else {
                var hex = code.toString(16).toLowerCase();
                return '\\'+hex+' ';
            }
        });
    };
    secureFilters.html = function(val) {
        var str = String(val);
        str = convertControlCharacters(str);
        return str.replace(/[^\t\n\v\f\r ,\.0-9A-Z_a-z\-\u00A0-\uFFFF]/g, function(match) {
            var code = match.charCodeAt(0);
            switch(code) {
                // folks expect these "nice" entities:
                case 0x22:
                    return '"';
                case 0x26:
                    return '&';
                case 0x3C:
                    return '<';
                case 0x3E:
                    return '>';

                default:
                    // optimize for size:
                    if (code < 100) {
                        var dec = code.toString(10);
                        return '&#'+dec+';';
                    } else {
                        // XXX: this doesn't produce strictly valid entities for code-points
                        // requiring a UTF-16 surrogate pair. However, browsers are generally
                        // tolerant of this. Surrogate pairs are currently in the whitelist
                        // defined via HTML_NOT_WHITELISTED.
                        var hex = code.toString(16).toUpperCase();
                        return '&#x'+hex+';';
                    }
            }
        });
    };
    secureFilters.style = function(val) {
        return secureFilters.html(secureFilters.css(val));
    };
    secureFilters.uri = function(val) {
        // encodeURIComponent() is well-standardized across browsers and it handles
        // UTF-8 natively.  It will not encode "~!*()'", so need to replace those here.
        // encodeURIComponent also won't encode ".-_", but those are known-safe.
        //
        // IE does not always encode '"' to '%27':
        // http://blog.imperva.com/2012/01/ie-bug-exposes-its-users-to-xss-attacks-.html
        var QUOT = /\x22/g; // "
        var APOS = /\x27/g; // '
        var AST = /\*/g;
        var TILDE = /~/g;
        var BANG = /!/g;
        var LPAREN = /\(/g;
        var RPAREN = /\)/g;
        var encode = encodeURI(String(val));
        // modification by matomo: we use encodeURI instead of encodeURIComponent as we are currently not detecting
        // whether we are escaping a variable as part of a uri or the full uri
        return encode
            .replace(BANG, '%21')
            .replace(QUOT, '%27')
            .replace(APOS, '%27')
            .replace(LPAREN, '%28')
            .replace(RPAREN, '%29')
            .replace(AST, '%2A')
            .replace(TILDE, '%7E');
    };
    /*! end secure filters */

    return function (parameters, TagManager) {

        function moveChildrenToArray(element)
        {
            var children = [];
            var j = 0;
            while (j in element.childNodes && element.childNodes.length) {
                children.push(element.removeChild(element.childNodes[j]));
            }
            return children;
        }

        function cloneScript(element) {
            var newScript = parameters.document.createElement('script');

            var src = TagManager.dom.getElementAttribute(element, 'src');
            if (src) {
                newScript.src = src;
            } else {
                newScript.text = element.text || element.textContent || element.innerHTML || '';
            }

            if (element.id) {
                newScript.id = element.id;
            }
            if (element.charset) {
                newScript.charset = element.charset;
            }
            if (element.defer) {
                newScript.defer = element.defer;
            }
            if (element.async) {
                newScript.async = element.async;
            }

            newScript.type = "text/javascript";

            return newScript;
        }

        function isJavaScriptElement(element)
        {
            if (element && element.nodeName && element.nodeName.toLowerCase() === 'script') {
                // we have to re-create the element, otherwise wouldn't be executed
                var type = TagManager.dom.getElementAttribute(element, 'type');
                if (!type || String(type).toLowerCase() === 'text/javascript') {
                    return true;
                }
            }
            return false;
        }

        function doChildrenContainJavaScript(element)
        {
            return element && element.innerHTML && element.innerHTML.toLowerCase().indexOf("<script") !== -1;
        }

        function insertNode(parent, child, append)
        {
            if (append || !parent.firstChild) {
                parent.appendChild(child);
            } else {
                parent.insertBefore(child, parent.firstChild);
            }
        }

        function moveNodes(parent, children, append)
        {
            var limit = 5000; // prevent endless loop
            var counter = 0;
            var child;

            while (counter in children && children[counter] && counter < limit) {
                child = children[counter];
                counter++;

                if (isJavaScriptElement(child)) {
                    // we have to re-create the element, otherwise wouldn't be executed
                    insertNode(parent, cloneScript(child), append);
                } else if (doChildrenContainJavaScript(child)) {
                    // it contains at least one script, we better move them individually...
                    // first we remove all children from the element to have only the plain element left
                    var subChildren = moveChildrenToArray(child);
                    insertNode(parent, child, append);
                    // then we move all nodes indidivdually into it
                    moveNodes(child, subChildren);
                } else {
                    insertNode(parent, child, append);
                }
            }
        }

        this.fire = function () {
            var html = parameters.customHtml;
            if (html && html.type === 'JoinedVariable') {
                var variables = html.getDefinition();
                var value = '', varReturn, theVarValue, isVariable, hasValueSet;
                for (var i = 0; i < variables.length; i++) {
                    varReturn = parameters.buildVariable(variables[i]);
                    isVariable = TagManager.utils.isObject(variables[i]);
                    theVarValue = varReturn.get();
                    hasValueSet = theVarValue !== false && theVarValue !== null && TagManager.utils.isDefined(theVarValue);

                    if (isVariable) {
                        if (TagManager.dom.isElementContext(value, 'script')) {
                            // instead of serializing the object, we make it accessible through a method so users can reference
                            // an object using eg "var mytest = {{myObj}}"
                            if (!TagManager.utils.isDefined(TagManager.customHtmlDataStore)) {
                                TagManager.customHtmlDataStore = [];
                            }
                            TagManager.customHtmlDataStore.push(theVarValue);
                            value += 'window.MatomoTagManager.customHtmlDataStore[' + (TagManager.customHtmlDataStore.length - 1) +']';
                        } else if (TagManager.dom.isElementContext(value, 'style')
                                 || TagManager.dom.isAttributeContext(value, 'style')) {
                            if (hasValueSet) {
                                // we need to make sure to print a value... we use a random value... if someone searches for it
                                // they can find the FAQ article
                                value += secureFilters.css(theVarValue);
                            } else {
                                value += 'mTmKpwoqM';
                            }
                        } else if (TagManager.dom.isAttributeContext(value, 'href') || TagManager.dom.isAttributeContext(value, 'src')) {
                            if (hasValueSet) {
                                value += secureFilters.uri(theVarValue);
                            }
                        } else if (hasValueSet) {
                            value += secureFilters.html(theVarValue);
                        }
                    } else if (hasValueSet) {
                        // raw value entered by user, no escaping
                        value += theVarValue;
                    }
                }
                html = value;
            } else {
                html = html.get();
            }
            if (html) {
                var div = parameters.document.createElement('div');
                div.innerHTML = html;
                if (div.childNodes) {
                    var children = moveChildrenToArray(div);

                    var htmlPosition = parameters.get('htmlPosition', 'bodyEnd');

                    var append = true;
                    if (htmlPosition === 'headStart' || htmlPosition === 'bodyStart') {
                        append = false;
                    }

                    if (htmlPosition === 'headStart' || htmlPosition === 'headEnd') {
                        moveNodes(parameters.document.head, children, append);
                    } else if (parameters.document.body) {
                        moveNodes(parameters.document.body, children, append);
                    } else {
                        // tag manager is embedded in head and loaded before body exists, need to wait for body to exist
                        TagManager.dom.onReady(function () {
                            moveNodes(parameters.document.body, children, append);
                        });
                    }
                }
            }
        };
    };
})();