extern JSCore.Value jscore_object_call_as_function(
	JSCore.Context ctx,
	JSCore.Object object, 
	JSCore.Object thisObject,
	string  val,
	out JSCore.Value exception
	);
	

 

namespace Palete {

	public errordomain JavascriptError {
		MISSING_METHOD,
		MISSING_FILE
		
	}

	Javascript instance = null;
	
	public class Javascript {


		public static JSCore.Object class_constructor(
				JSCore.Context ctx, 
				JSCore.Object constructor,  
				JSCore.Value[] arguments, 
                              out JSCore.Value exception) 
		{
		        var c = new JSCore.Class (class_definition);
		        var o = new JSCore.Object (ctx, c, null);
				exception = null;
		        return o;
		}
		static const JSCore.StaticFunction[] class_functions = {
		         { null, null, 0 }
		};
		static const JSCore.ClassDefinition class_definition = {
		    0,
		    JSCore.ClassAttribute.None,
		    "App",
		    null,

		    null,
		    class_functions,

		    null,
		    null,

		    null,
		    null,
		    null,
		    null,

		    null,
		    null,
		    class_constructor,
		    null,
		    null
		};

		
		public JSCore.GlobalContext js_global_context =  null;

		public static Javascript singleton()
		{
			if (instance == null) {
				instance = new Javascript();
			}
			return instance;
		}
		public Javascript()
		{
			var goc = new JSCore.Class(  class_definition ); 
			this.js_global_context = new JSCore.GlobalContext(goc);
			

		}
		public int validate(string code, out string res)
		{
			JSCore.Value ex;
			unowned   JSCore.GlobalContext ctx = this.js_global_context;
			var ret = this.js_global_context.check_script_syntax(
	                           new JSCore.String.with_utf8_c_string(code),
	                           null,
	                           0,
	                           out ex
           		);
			res = ""; 
			if (ex.is_null(ctx)) {
				return -1;
			}

	 		
			var exo = ex.to_object(ctx, null);
			unowned JSCore.PropertyNameArray property_names = exo.copy_property_names (ctx);

			
			
			 
			var js_string = new JSCore.String.with_utf8_c_string("line");
			var line = exo.get_property(ctx, js_string, null).to_number(ctx,null);
			
			

			// see if we can convert exception string
			char *c_string = new char[1024];
			var err_string = ex.to_string_copy (ctx, null);
			err_string.get_utf8_c_string (c_string, 1023);
			res = (string)c_string;
			//print ("Error on line %d\n%s\n", (int)line, res); 
			
			var rline = (int) line;
			
			return rline > 0 ? rline -1 : 0;
		
			
		}
		/**
		 * extension API concept..
		 * javascript file.. loaded into jscore, 
		 * then a method is called, with a string argument (json encoded)
		 * 
		 */
		public string executeFile(string fname, string call_method, string js_data)
				throws JavascriptError
		{
			string file_data;
			if (!FileUtils.test (fname, FileTest.EXISTS)) {
				throw new JavascriptError.MISSING_FILE("Plugin: file not found %s", fname);
			}
		
			FileUtils.get_contents(fname, out file_data);
			
			var jfile_data = new JSCore.String.with_utf8_c_string(file_data);
			var jmethod = new JSCore.String.with_utf8_c_string(call_method);
			//var json_args = new JSCore.String.with_utf8_c_string(js_data);
			
			     JSCore.Value exa;
			  JSCore.Value exb;
			unowned JSCore.Value exc;
			   JSCore.Value exd;
			   unowned JSCore.Value exe;
			
			var goc = new JSCore.Class(  class_definition ); 
			var ctx = new JSCore.GlobalContext(goc);
			var othis = ctx.get_global_object();
			
			var eval = ctx.evaluate_script (
						jfile_data,
						othis,
						null,
		                0,
		                out exa
				);
			
			
			if (!othis.has_property(ctx,jmethod)) {
				throw new JavascriptError.MISSING_METHOD ("Plugin: missing method  %s", call_method);
			 
			}
			
			var val =  othis.get_property (ctx, jmethod, out exb);
			
			if (!val.is_object(ctx)) {
				throw new JavascriptError.MISSING_METHOD ("Plugin: not a property not found  %s", call_method);
			}
			var oval = val.to_object(ctx,  out  exc);
			
			if (!oval.is_function(ctx)) {
				throw new JavascriptError.MISSING_METHOD ("Plugin: not a method  %s", call_method);
			}
			
		 
			 var res = jscore_object_call_as_function(
				ctx, oval, othis, js_data, out exd
				);
		     // this will never work, as we can not create arrays of Values - due to no 
		     // free function being available..
			 //var args =  new JSCore.Value[1] ;
			 //args[0] = new JSCore.Value.string(ctx,json_args) ;
			 
			 //unowned JSCore.Value res = oval.call_as_function(ctx, othis, null, out exd);
			// extract the text value from res...
			 JSCore.String  sv = res.to_string_copy ( ctx,  out  exe);
			 var length = sv.get_maximum_utf8_c_string_size();
			 var buf = new char[length];
			
			 sv.get_utf8_c_string( buf, length);
			 
			 
			 print("ret:%s\n",(string)  buf);
			 return (string) buf;
			
		}
		
		

	}
	
	


}