/* 
    Peter
    Simple httprequest wrapper. It will be replaced by an ajax framework in the future.
  
    Based on Wrapper by http://adamv.com/dev/javascript/http_request
*/

var Http = {
    ReadyState: {
        Uninitialized: 0,
        Loading: 1,
        Loaded:2,
        Interactive:3,
        Complete: 4
    },
		
    Status: {
        OK: 200,
		
        Created: 201,
        Accepted: 202,
        NoContent: 204,
		
        BadRequest: 400,
        Forbidden: 403,
        NotFound: 404,
        Gone: 410,
		
        ServerError: 500
    },
		
    Method: {
        Get: "GET",
        Post: "POST"
    },
	
    enabled: false,
    req: null,
	
    Init: function(){

        if (window.XMLHttpRequest) {
            Http.req = new XMLHttpRequest();
        }
        else if (window.ActiveXObject) {
            Http.req = new ActiveXObject("Microsoft.XMLHTTP");
        }

        Http.enabled = (Http.req != null);
    },
    get: function(params, callback_args){
		
        if (!Http.enabled) throw "Http: XmlHttpRequest not available.";
		
        var url = params.url;
        if (!url) throw "Http: A URL must be specified";
				
        var method = params.method || Http.Method.Get;
        var callback = params.callback;
		
        // Only one request at a time, please
        if ((Http.req.readyState != Http.ReadyState.Uninitialized) &&
            (Http.req.readyState != Http.ReadyState.Complete)){
            this.req.abort();
			
        }
		
        Http.req.open(method, url, true);

        Http.req.onreadystatechange =  function() {
            if (Http.req.readyState != Http.ReadyState.Complete) return;
			
            if (callback_args == null) callback_args = new Array();

            var cb_params = new Array();
            cb_params.push(Http.req);
            for(var i=0;i<callback_args.length;i++)
                cb_params.push(callback_args[i]);
				
            callback.apply(null, cb_params);
        };
		
        Http.req.send(params.body || null);
    }
	
};
Http.Init();