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/**
 * Copyright 2012 Julian Aubourg <j@ubourg.net>
 * 
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * jQuery.ajax mid - CROSS DOMAIN AJAX 
 * ---
 * @author James Padolsey (http://james.padolsey.com)
 * @version 0.11
 * @updated 12-JAN-10
 * ---
 * Note: Read the README!
 * ---
 * @info http://james.padolsey.com/javascript/cross-domain-requests-with-jquery/
 */

jQuery.ajax = (function(_ajax){
    
    var protocol = location.protocol,
        hostname = location.hostname,
        exRegex = RegExp(protocol + '//' + hostname),
        YQL = 'http' + (/^https/.test(protocol)?'s':'') + '://query.yahooapis.com/v1/public/yql?callback=?',
        query = 'select * from html where url="{URL}" and xpath="*"';
    
    function isExternal(url) {
        return !exRegex.test(url) && /:\/\//.test(url);
    }
    
    return function(o) {
        
        var url = o.url;
        
        if ( /get/i.test(o.type) && !/json/i.test(o.dataType) && isExternal(url) ) {
            
            // Manipulate options so that JSONP-x request is made to YQL
            
            o.url = YQL;
            o.dataType = 'json';
            
            o.data = {
                q: query.replace(
                    '{URL}',
                    url + (o.data ?
                        (/\?/.test(url) ? '&' : '?') + jQuery.param(o.data)
                    : '')
                ),
                format: 'xml'
            };
            
            // Since it's a JSONP request
            // complete === success
            if (!o.success && o.complete) {
                o.success = o.complete;
                delete o.complete;
            }
            
            o.success = (function(_success){
                return function(data) {
                    
                    if (_success) {
                        // Fake XHR callback.
                        _success.call(this, {
                            responseText: (data.results[0] || '')
                                // YQL screws with <script>s
                                // Get rid of them
                                .replace(/<script[^>]+?\/>|<script(.|\s)*?\/script>/gi, '')
                        }, 'success');
                    }
                    
                };
            })(o.success);
            
        }
        
        return _ajax.apply(this, arguments);
        
    };
    
})(jQuery.ajax);