/**
 * This is a wrapper for swfobject that detects FlashBlock in browser.
 *
 * Wrapper detects:
 *   - Chrome
 *     - FlashBlock (https://chrome.google.com/webstore/detail/cdngiadmnkhgemkimkhiilgffbjijcie)
 *     - FlashBlock (https://chrome.google.com/webstore/detail/gofhjkjmkpinhpoiabjplobcaignabnl)
 *     - FlashFree (https://chrome.google.com/webstore/detail/ebmieckllmmifjjbipnppinpiohpfahm)
 *   - Firefox Flashblock (https://addons.mozilla.org/ru/firefox/addon/flashblock/)
 *   - Opera >= 11.5 "Enable plugins on demand" setting
 *   - Safari ClickToFlash Extension (http://hoyois.github.com/safariextensions/clicktoplugin/)
 *   - Safari ClickToFlash Plugin (for Safari < 5.0.6) (http://rentzsch.github.com/clicktoflash/)
 *
 * Tested on:
 *   - Chrome 12
 *     - FlashBlock by Lex1 1.2.11.12
 *     - FlashBlock by josorek 0.9.31
 *     - FlashFree 1.1.3
 *   - Firefox 5.0.1 + Flashblock 1.5.15.1
 *   - Opera 11.5
 *   - Safari 5.1 + ClickToFlash (2.3.2)
 *
 * Also this wrapper can remove blocked swf and let you downgrade to other options.
 *
 * Feel free to contact me via email.
 *
 * Copyright 2011, Alexey Androsov
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) or GPL Version 3 (http://www.gnu.org/licenses/gpl.html) licenses.
 *
 * @requires swfobject
 * @author Alexey Androsov <doochik@ya.ru>
 * @version 1.0
 *
 * Thanks to flashblockdetector project (http://code.google.com/p/flashblockdetector)
 */
(function(/**document*/document, /**window*/window) {

    function remove(node) {
        node.parentNode.removeChild(node);
    }

    var FlashBlockNotifier = {

        /**
         * CSS-class for swf wrapper.
         * @protected
         * @default fbn-swf-wrapper
         * @type String
         */
        __SWF_WRAPPER_CLASS: 'fbn-swf-wrapper',

        /**
         * Timeout for flash block detect
         * @default 500
         * @protected
         * @type Number
         */
        __TIMEOUT: 500,

        __TESTS: [
            // Chome FlashBlock extension (https://chrome.google.com/webstore/detail/cdngiadmnkhgemkimkhiilgffbjijcie)
            // Chome FlashBlock extension (https://chrome.google.com/webstore/detail/gofhjkjmkpinhpoiabjplobcaignabnl)
            function(swfNode, wrapperNode) {
                // we expect that swf is the only child of wrapper
                return wrapperNode.childNodes.length > 1
            },
            // older Safari ClickToFlash (http://rentzsch.github.com/clicktoflash/)
            function(swfNode) {
                // IE has no swfNode.type
                return swfNode.type && swfNode.type != 'application/x-shockwave-flash'
            },
            // FlashBlock for Firefox (https://addons.mozilla.org/ru/firefox/addon/flashblock/)
            // Chrome FlashFree (https://chrome.google.com/webstore/detail/ebmieckllmmifjjbipnppinpiohpfahm)
            function(swfNode) {
                // swf have been detached from DOM
                return !swfNode.parentNode;
            },
            // Safari ClickToFlash Extension (http://hoyois.github.com/safariextensions/clicktoplugin/)
            function(swfNode) {
                return swfNode.parentNode.className.indexOf('CTFnodisplay') > -1;
            }
        ],

        /**
         * Embed SWF info page. This function has same options as swfobject.embedSWF except last param removeBlockedSWF.
         * @see http://code.google.com/p/swfobject/wiki/api
         * @param swfUrlStr
         * @param replaceElemIdStr
         * @param widthStr
         * @param heightStr
         * @param swfVersionStr
         * @param xiSwfUrlStr
         * @param flashvarsObj
         * @param parObj
         * @param attObj
         * @param callbackFn
         * @param {Boolean} [removeBlockedSWF=true] Remove swf if blocked
         */
        embedSWF: function(swfUrlStr, replaceElemIdStr, widthStr, heightStr, swfVersionStr, xiSwfUrlStr, flashvarsObj, parObj, attObj, callbackFn, removeBlockedSWF) {
            var swfobject = window['swfobject'];

            if (!swfobject) {
                return;
            }

            swfobject.addDomLoadEvent(function() {
                var replaceElement = document.getElementById(replaceElemIdStr);
                if (!replaceElement) {
                    return;
                }

                // We need to create div-wrapper because some flash block plugins replace swf with another content.
                // Also some flash requires wrapper to work properly.
                var wrapper = document.createElement('div');
                wrapper.className = FlashBlockNotifier.__SWF_WRAPPER_CLASS;

                replaceElement.parentNode.replaceChild(wrapper, replaceElement);
                wrapper.appendChild(replaceElement);

                swfobject.embedSWF(swfUrlStr, replaceElemIdStr, widthStr, heightStr, swfVersionStr, xiSwfUrlStr, flashvarsObj, parObj, attObj, function(e) {
                    // e.success === false means that browser don't have flash or flash is too old
                    // @see http://code.google.com/p/swfobject/wiki/api
                    if (!e || e.success === false) {
                        callbackFn(e);

                    } else {
                        var swfElement = e['ref'];

                        if (swfElement && swfElement['getSVGDocument'] && swfElement['getSVGDocument']()) {
                            // Opera 11.5 and above replaces flash with SVG button
                            onFailure(e);

                        } else {
                            //set timeout to let FlashBlock plugin detect swf and replace it some contents
                            window.setTimeout(function() {
                                var TESTS = FlashBlockNotifier.__TESTS;
                                for (var i = 0, j = TESTS.length; i < j; i++) {
                                    if (TESTS[i](swfElement, wrapper)) {
                                        onFailure(e);
                                        return;
                                    }
                                }
                                callbackFn(e);
                            }, FlashBlockNotifier.__TIMEOUT);
                        }
                    }

                    function onFailure(e) {
                        if (removeBlockedSWF !== false) {
                            //remove swf
                            swfobject.removeSWF(replaceElemIdStr);
                            //remove wrapper
                            remove(wrapper);

                            //remove extension artefacts
                            
                            //ClickToFlash artefacts
                            var ctf = document.getElementById('CTFstack');
                            if (ctf) {
                                remove(ctf);
                            }

                            //Chrome FlashBlock artefact
                            var lastBodyChild = document.body.lastChild;
                            if (lastBodyChild && lastBodyChild.className == 'ujs_flashblock_placeholder') {
                                remove(lastBodyChild);
                            }
                        }
                        e.success = false;
                        e.__fbn = true;
                        callbackFn(e);
                    }
                });
            });
        }
    };

    /**
     * FlashBlockNotifier is a wrapper for swfobject that detects FlashBlock in browser.
     */
    window['FlashBlockNotifier'] = FlashBlockNotifier;
})(document, window);