/*
 * jQuery OpenX ad tags plugin
 *
 * Tested with OpenX Community Edition 2.8.8-rc6
 *
 * @version @VERSION
 * @date @DATE
 * @requires jQuery
 * @url http://plugins.jquery.com/project/openxtag
 *
 * @author Nikolay Morev <kolia@denivip.ru>
 * @license MIT License (http://www.opensource.org/licenses/mit-license.php)
 *
 */

(function ($) {

    // NOTE Use strings instead of symbolic names if that name will be used
    // externally. It is needed to preserve the name after closure compiler
    // advanced optimization

    var _loopIterations = 10;

    var defaults = {
        'jsPrefix': 'OA_',
        'swfObjectJS': 'fl.js',
        'delivery': null,
        'deliverySSL': null,
        'jsTagScript': 'ajs.php',
        'spcTagScript': 'spc.php',
        'iframeTagScript': 'afr.php',
        'adViewScript': 'avw.php',
        'clickScript': 'ck.php',
        'charset': 'UTF-8',
        'zoneID': null,
        'target': undefined,
        'source': undefined,
        'blockcampaign': undefined, // bool option
        'block': undefined, // bool option
        'forceAsync': false, // not compatible with block(campaign) parameters
        'refresh': undefined,
        'resize': undefined,
        'allowtransparent': undefined,
        'width': undefined,
        'height': undefined,
        'extra': undefined // object of key-value pairs for custom parameters
    };

    var init = function (options) {
        defaults = $.extend(defaults, options);
    };

    // {{{ function _documentWriteSafeAppend(markup, $this, success) { ... }
    function _documentWriteSafeAppend(markup, $this, success) {
        var cnt = 0; // prevent infinite loops
        (function (markup) {
            if (markup.match(/document\.write|<script/)) {
                var oldDocumentWrite = document.write;
                var buffer = '';
                document.write = function (markup) {
                    buffer += markup;
                };
                $this.append(markup);
                document.write = oldDocumentWrite;

                cnt++;
                if (cnt > _loopIterations) {
                    $.error('openxtag: document.write loop stopped after ' + _loopIterations + ' iterations');
                }

                arguments.callee(buffer);
            }
            else {
                $this.append(markup);
                if (typeof success == 'function') {
                    setTimeout(function () { success.call($this); }, 0);
                }
            }
        })(markup);
    }
    // }}} _documentWriteSafeAppend

    // {{{ function _genericZoneCall(func, zoneID, options, success) { ... }
    function _genericZoneCall(func, zoneID, options, success) {

        // shift parameters if zoneID is skipped

        if (typeof zoneID == 'object' || typeof zoneID == 'function') {
            success = options;
            options = zoneID;
            zoneID = null;
        }

        // shift parameters if options are skipped

        if (typeof options == 'function') {
            success = options;
            options = null;
        }

        var settings = $.extend(defaults, options);
        if (zoneID != null) {
            settings['zoneID'] = zoneID;
        }

        return func.apply(this, [zoneID, settings, success]);
    }
    // }}} _genericZoneCall

    // {{{ function _validateSettings(settings) { ... }
    function _validateSettings(settings) {

        // check for required parameters

        if (location.protocol == 'https:') {
            if (typeof settings['deliverySSL'] != 'string') {
                $.error('please set "deliverySSL" option for openxtag');
            }
        }
        else {
            if (typeof settings['delivery'] != 'string') {
                $.error('please set "delivery" option for openxtag');
            }
        }
    }
    // }}} _validateSettings

    // {{{ function _buildStandardRequestParameters() { ... }
    function _buildStandardRequestParameters(settings) {
        var data = {
            'charset': settings['charset'],
            'target': settings['target'],
            'source': settings['source'],
            'loc': window.location.href
        };

        if (typeof settings['extra'] != 'undefined') {
            data = $.extend(data, settings['extra']);
        }

        if (typeof settings['block'] != 'undefined') {
            data['block'] = settings['block'] ? 1 : 0;
        }

        if (typeof settings['blockcampaign'] != 'undefined') {
            data['blockcampaign'] = settings['blockcampaign'] ? 1 : 0;
        }

        if (document.referrer) {
            data['referer'] = document.referrer;
        }

        // fixing http://bugs.jquery.com/ticket/8653

        for (var key in data) {
            if (typeof data[key] == 'undefined') {
                delete data[key];
            }
        }

        return data;
    }
    // }}} _buildStandardRequestParameters

    // {{{ function jsZone(zoneID, settings, success) { ... }
    // Javascript zone tag type
    var jsZone = function (zoneID, settings, success) {
        return this.each(function () {
            var $this = $(this);

            var thesettings = $.extend({}, settings);
            if (typeof $.metadata != 'undefined') {
                thesettings = $.extend(thesettings, $this.metadata());
            }

            _validateSettings(thesettings);

            var zoneID = thesettings['zoneID'];
            if (zoneID == null) {
                $.error('please set "zoneID" option for openxtag jsZone');
            }

            var data = _buildStandardRequestParameters(thesettings);
            data['zoneid'] = zoneID;
            data['cb'] = Math.floor(Math.random()*99999999999);

            // only needed for OpenX < 2.4
            if (!document['MAX_used']) {
                document['MAX_used'] = ',';
            }
            if (document['MAX_used'] != ',') {
                data['exclude'] = document['MAX_used'];
            }

            if (document.context) {
                data['context'] = document.context;
            }
            if (document.mmm_fo) {
                data['mmm_fo'] = 1;
            }
                                     
            var scriptURL = (location.protocol == 'https:' ? thesettings['deliverySSL'] : thesettings['delivery']) + '/' + thesettings['jsTagScript'];
       
            $.ajax({
                url: scriptURL,
                data: data,                
                dataType: 'html',
                async: thesettings['forceAsync'], // should be disabled for block(campaign)
                success: function (data) { 
                    alert(data);                   
                   _documentWriteSafeAppend('<script type="text/javascript">' + data + '</script>', $this, success);                     
                }
            });          
                  
        });
    };
    // }}} jsZone

    var iFrameZone = function (zoneID, settings, success) {
        return this.each(function () {
            var $this = $(this);

            var thesettings = $.extend({}, settings);
            if (typeof $.metadata != 'undefined') {
                thesettings = $.extend(thesettings, $this.metadata());
            }

            _validateSettings(thesettings);

            var zoneID = thesettings['zoneID'];
            if (zoneID == null) {
                $.error('please set "zoneID" option for openxtag iframe');
            }

            var data = _buildStandardRequestParameters(thesettings);
            data['zoneid'] = zoneID;
            data['cb'] = Math.floor(Math.random()*99999999999);

            if (typeof thesettings['refresh'] != 'undefined') {
                data['refresh'] = thesettings['refresh'];
            }

            if (typeof thesettings['resize'] != 'undefined') {
                data['resize'] = thesettings['resize'] ? 1 : 0;
            }

            if (typeof thesettings['width'] == 'undefined') {
                $.error('openxtag: width parameter is required for iframe tag');
            }
            var width = thesettings['width'];

            if (typeof thesettings['height'] == 'undefined') {
                $.error('openxtag: height parameter is required for iframe tag');
            }
            var height = thesettings['height'];

            var allowtransparent = '';
            if (typeof thesettings['allowtransparent'] != 'allowtransparent' && 
                thesettings['allowtransparent']) {
                allowtransparent = ' allowtransparency="true" ';
            }

            var uniqid = 'a' + Math.floor(Math.random()*999999);

            var target = (typeof thesettings['target'] == 'undefined' ? '_blank' : thesettings['target']);

            var delivery = (location.protocol == 'https:' ? thesettings['deliverySSL'] : thesettings['delivery']);
            var scriptURL = delivery + '/' + thesettings['iframeTagScript'];
            var clickURL = delivery + '/' + thesettings['clickScript'];
            var adViewURL = delivery + '/' + thesettings['adViewScript'];

            $this.append("<iframe id='" + uniqid + "' name='" + uniqid + "' src='" + scriptURL + "?" + $.param(data) + 
            "' frameborder='0' scrolling='no' width='" + width + "' height='" + height + 
            "'" + allowtransparent + "><a href='" + clickURL + "?n=" + uniqid + "&amp;cb=" + data['cb'] + "' target='" + 
            target + "'><img src='" + adViewURL + "?zoneid=" + zoneID + "&amp;cb=" + 
            data['cb'] + "&amp;n=" + uniqid + "' border='0' alt='' /></a></iframe>");

        });
    };

    // {{{ function spcTag(zoneID, settings, success) { ... }
    // Single Page Call tag type
    var spcTag = function (zoneID, settings, success) {

        // get zone ids

        var zones = {};
        var i = 0;
        var chainObj = this.each(function () {
            var $this = $(this);

            var thesettings = $.extend({}, settings);
            if (typeof $.metadata != 'undefined') {
                thesettings = $.extend(thesettings, $this.metadata());
            }

            var zoneID = thesettings['zoneID'];
            if (zoneID == null) {
                $.error('please set "zoneID" option for openxtag jsZone');
            }

            var zoneName = 'z' + i;
            zones[zoneName] = zoneID;
            $this.data('openxtag', { 'zn': zoneName });

            i++;
        });

        var thesettings = $.extend({}, settings);
        _validateSettings(thesettings);

        var data = _buildStandardRequestParameters(thesettings);
        data['zones'] = $.map(zones, function (id, name) { return name + '=' + id; }).join('|');
        data['nz'] = 1; // named zones

        var scriptURL = (location.protocol == 'https:' ? thesettings['deliverySSL'] : thesettings['delivery']) + '/' + thesettings['spcTagScript'];
        var that = this;
        $.ajax({
            url: scriptURL,
            data: data,
            dataType: 'script',
            success: function (data) {
                loadFlashObjectOnce(thesettings, function () {
                    // do eval here to work around potential problems when two
                    // requests are run in parallel and one OA_output
                    // overwrites another OA_output in global context

                    var output = eval('(function () {' + data + ';return ' + thesettings['jsPrefix'] + 'output;})()');
                    that.each(function () {
                        var $this = $(this);
                        _documentWriteSafeAppend(output[$this.data('openxtag')['zn']], $this, success);
                    });
                });
            }
        });

        return chainObj;
    };
    /// }}} spcTag

    function loadFlashObjectOnce(thesettings, callback) {
        if (typeof window['org'] != 'undefined' && 
            typeof window['org']['openx'] != 'undefined' && 
            typeof window['org']['openx']['SWFObject'] != 'undefined') {
            callback();
        }
        else {
            var flJsURL = (location.protocol == 'https:' ? thesettings['deliverySSL'] : thesettings['delivery']) + '/' + thesettings['swfObjectJS'];
            $.getScript(flJsURL, callback);
        }
    }

    var fnMethods = {
        'zone': jsZone,
        'jsZone': jsZone,
        'spc': spcTag,
        'iframe': iFrameZone
    };

    // {{{ function $.fn.openxtag(method) { ... }
    /**
     * Loads ad code from OpenX server into all HTML placeholders specified in
     * jQuery object.
     *
     * @name openxtag
     *
     * @example <div class="banner"></div>
     * $('.banner').openxtag('zone', 1);
     *
     * @descr Loads ads into elements
     * @param string type Type of ad invocation tag. Currently supported types
     * are 'jsZone' for JavaScript invocation tag, 'spc' for Single Page Call
     * tag, and 'iframe' for iFrame tag. "zone" is alias for "jsZone".
     * @param number zoneID ID of OpenX zone to load banner from.
     * @param object options An object containing settings to override the
     * defaults (see init).
     * @param function success Callback function to call on successful loading
     * of ad.
     * @type jQuery
     * @cat Plugins/OpenXTag
     * @see http://www.openx.org/docs/tutorials/comparisons-between-invocation-tags types of OpenX ad invocation tags
     */
    $.fn.extend({
        'openxtag': function (method) {
            if (fnMethods[method]) {
                return _genericZoneCall.apply(this, [ fnMethods[method] ].concat(Array.prototype.slice.call(arguments, 1)));
            } else {
                $.error('Method ' +  method + ' does not exist on jQuery.openxtag');
            }
        }
    });
    // }}} $.fn.openxtag

    var methods = {
        'init': init
    };

    // {{{ function $.openxtag(method) { ... }
    /**
     * Sets default settings for ad loading.
     *
     * The following settings are supported:
     *
     *   jsPrefix: prefix of JavaScript variables returned from OpenX server
     *   (see var/prefix option in OpenX configuration). Default: 'OA_'.
     *
     *   swfObjectJS: SWFObject script with OpenX modifications (see file/flash
     *   option in OpenX configuration). Default: 'fl.js'.
     *
     *   delivery: OpenX base URL for ad delivery scripts (see webpath/delivery
     *   option in OpenX configuration). Example:
     *   http://example.com/openx/delivery.
     *
     *   deliverySSL: Same for https web pages.
     *
     *   jsTagScript: Name of OpenX script to request JavaScript tag type (see
     *   file/js option in OpenX configuration). Default: 'ajs.php'.
     *
     *   spcTagScript: Name of OpenX script to make Single Page Call request
     *   (see file/singlepagecall option in OpenX configuration). Default:
     *   'spc.php'.
     *
     *   iframeTagScript: Name of OpenX script to make IFrame tag request (see
     *   file/frame option in OpenX configuration). Default: 'afr.php'.
     *
     *   clickScript: Name of OpenX script to log ad clicks (see file/click
     *   option in OpenX configuration). Required for IFrame tag. Default:
     *   'ck.php'.
     *
     *   adViewScript: Name of OpenX script to log ad views for IFrame tag.
     *   Default: 'avw.php'.
     *
     *   charset: Character set of web page. Default: 'UTF-8'.
     *
     *   zoneID: ID of OpenX zone to load ads from (see Inventory > Zones in
     *   OpenX manager interface).
     *
     *   target: Target frame for ad link. Example: '_blank' to open ad link in
     *   new window.
     *
     *   source: Source parameter can be used to target ads by it's value.
     *
     *   blockcampaign: Boolean. When set ads from the same campaign will not
     *   be loaded on the same page.
     *
     *   block: Boolean. When set the same ad will not be loaded on the same
     *   page twice.
     *
     *   forceAsync: Boolean. Force asyncronous loading of ads so that one ad
     *   will not block loading of another ad. Even when it is set to false ads
     *   are still loaded asynchronously with page loading. Setting this option
     *   to true is not compatible with block and blockcampaign options.
     *   Default: false.
     *
     *   refresh: Refresh banner after N seconds. This option is only supported
     *   in IFrame tag.
     *
     *   resize: (Boolean) Resize IFrame to banner dimensions. This option is only
     *   supported in IFrame tag.
     *
     *   allowtransparent: (Boolean) Make the IFrame transparent. This option
     *   is only supported in IFrame tag.
     *
     *   width: Width of banner zone. Required for IFrame tag type.
     *
     *   height: Height of banner zone. Required for IFrame tag type.
     *
     *   extra: An object of your own extra key-value pairs to pass to OpenX
     *   for targeting or custom functionality.
     *
     * @name $.openxtag
     *
     * @example 
     * $.openxtag('init', {
     *     delivery: 'http://example.com/openx/delivery',
     *     deliverySSL: 'https://example.com/openx/delivery'
     * });
     *
     * @param string method Must be "init"
     * @param object options An object containing settings to override the
     * defaults
     * @desc Sets default settings for ad loading.
     * @type undefined
     * @see http://www.openx.org/docs/2.8/userguide/zone%20invocation
     */
    $.extend({
        'openxtag': function (method) {
            if (methods[method]) {
                return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
            } else if (typeof method === 'object' || !method) {
                return methods.init.apply(this, arguments);
            } else {
                $.error('Method ' +  method + ' does not exist on jQuery.openxtag');
            }
        }
    });
    // }}} $.openxtag

})(jQuery);