/*======================================================================================
	
	Module:		CAjaxRpc

	Purpose:	Execute remote procedures and return value via ajax

	Author:		Sky Stebnicki, sky.stebnicki@aereus.com
				Copyright (c) 2006 Aereus Corporation. All rights reserved.
	
	Usage:		// Create ajaxrpc object
				var rpc = new CAjaxRpc("/path/to/xml.xml", "function_name", 
									   [["argument_name", "value"]], callback_function, cb_args);

======================================================================================*/

// Define globals
// -----------------------------------------------------------
var g_CAjaxRpc = new Array();


/***********************************************************************
*	Class:		CAjaxRpc
*
*	Purpose:	Create CAjaxRpc class
*
*	Arguments:	url			- string: path to server file
*				f_name 		- string: name of function to process on server
*				args		- array[][]: arguments to send to server.
*						      Sent via get using name=value
*				finished_cb	- string or function ref: function to call
*							  with return value after server has processed
*							  request. Define: function name(retval);
*
************************************************************************/
function CAjaxRpc(url, f_name, args, finished_cb, cb_args, method)
{
	var send_method = (method) ? method : AJAX_GET;
	// Get last index
	var ind = g_CAjaxRpc.length;
	g_CAjaxRpc[ind] = new CAjax();
	g_CAjaxRpc[ind].m_method = send_method;

	if (typeof cb_args != "undefined")
		g_CAjaxRpc[ind].m_cb_args = cb_args;
	else
		g_CAjaxRpc[ind].m_cb_args = null;

	g_CAjaxRpc[ind].onload = function()
	{
		var retval = null;

		var root = this.m_firstNode;
		// The result will be held in a variable called 'retval'
		if (root)
		{
			var num = root.getNumChildren();
			if (num)
			{
				for (i = 0; i < num; i++)
				{
					var child = root.getChildNode(i);
					if (child.m_name == "retval")
					{
						if (child.m_text)
							retval = unescape(child.m_text);
					}
				}
				
				if (this.cb_function)
				{
					try
					{
						if (typeof this.cb_function == "string")
						{
							if (this.m_cb_args)
							{
								var passargs = "\"" + retval + "\"";
								for (var j = 0; j < m_cb_args.length; j++)
								{
									passargs += ", \"" + m_cb_args[j] + "\"";
								}

								eval(this.cb_function + "(" + passargs + ")");
							}
							else
							{
								eval(this.cb_function + "(\"" + retval + "\")");
							}
						}
						else
						{
							if (this.m_cb_args)
							{
								switch (this.m_cb_args.length)
								{
								case 1:
									this.cb_function(retval, this.m_cb_args[0]);
									break;
								case 2:
									this.cb_function(retval, this.m_cb_args[0], this.m_cb_args[1]);
									break;
								case 3:
									this.cb_function(retval, this.m_cb_args[0], this.m_cb_args[1], this.m_cb_args[2]);
									break;
								case 4:
									this.cb_function(retval, this.m_cb_args[0], this.m_cb_args[1], 
													 this.m_cb_args[2], this.m_cb_args[3]);
									break;
								case 5:
									this.cb_function(retval, this.m_cb_args[0], this.m_cb_args[1], 
													 this.m_cb_args[2], this.m_cb_args[3], this.m_cb_args[4]);
									break;
								case 6:
									this.cb_function(retval, this.m_cb_args[0], this.m_cb_args[1], 
													 this.m_cb_args[2], this.m_cb_args[3], this.m_cb_args[4],
													 this.m_cb_args[5]);
									break;
								case 7:
									this.cb_function(retval, this.m_cb_args[0], this.m_cb_args[1], 
													 this.m_cb_args[2], this.m_cb_args[3], this.m_cb_args[4],
													 this.m_cb_args[5], this.m_cb_args[6]);
									break;
								case 8:
									this.cb_function(retval, this.m_cb_args[0], this.m_cb_args[1], 
													 this.m_cb_args[2], this.m_cb_args[3], this.m_cb_args[4],
													 this.m_cb_args[5], this.m_cb_args[6], this.m_cb_args[7]);
									break;
								case 9:
									this.cb_function(retval, this.m_cb_args[0], this.m_cb_args[1], 
													 this.m_cb_args[2], this.m_cb_args[3], this.m_cb_args[4],
													 this.m_cb_args[5], this.m_cb_args[6], this.m_cb_args[7],
													 this.m_cb_args[8]);
									break;
								case 10:
									this.cb_function(retval, this.m_cb_args[0], this.m_cb_args[1], 
													 this.m_cb_args[2], this.m_cb_args[3], this.m_cb_args[4],
													 this.m_cb_args[5], this.m_cb_args[6], this.m_cb_args[7],
													 this.m_cb_args[8], this.m_cb_args[9]);
									break;
								}
							}
							else
							{
								this.cb_function(retval);
							}
						}
					}
					catch (e) {}
				}
			}

			CAjaxRpcCleanup(this);
		}
	};

	var exec_url = url;
	exec_url += "?function=" + f_name;
	
	// Get callback (optional)
	if (finished_cb)
		g_CAjaxRpc[ind].cb_function = finished_cb;
	
	if (send_method == AJAX_POST && typeof args != "undefined")
	{
		g_CAjaxRpc[ind].exec(exec_url, args);
	}
	else
	{
		if (typeof args != "undefined" && args!=null)
		{
			var numargs = args.length;
			if (numargs)
			{
				// Arguments are pass as {name, value}
				for (i = 0; i < numargs; i++)
				{
					exec_url += "&" + args[i][0] + "=" + escape_utf8(args[i][1]);
				}
			}
		}
		g_CAjaxRpc[ind].exec(exec_url);
	}
}


/***********************************************************************
*	Function:	CAjaxRpcCleanup
*
*	Purpose:	Removes reference to ajax from global array
*
************************************************************************/
function CAjaxRpcCleanup(ref)
{
	var num = g_CAjaxRpc.length;
	for (i = 0; i < num; i++)
	{
		if (g_CAjaxRpc[i] == ref)
		{
			g_CAjaxRpc[i] = null;
		}
	}
}