MODULE UsbUtils;
IMPORT SYSTEM, WinApi, Strings, ComTools, Log := StdLog;

	CONST
		HK_LM_JRE_Key = "SOFTWARE\javaSoft\Java Runtime Environment";
		HK_LM_JRE_CurrentVersion_value = "CurrentVersion";
		HK_LM_JRE_JavaHome_value = "JavaHome";
		HK_LM_PATH_Key = "SYSTEM\CurrentControlSet\Control\Session Manager\Environment";
		HK_CU_PATH_Key = "Environment";
		PATH_value = "PATH";

	PROCEDURE RegLMQuery* (IN subKey, valueName: ARRAY OF SHORTCHAR;
																	OUT qValue: ARRAY OF SHORTCHAR): BOOLEAN;
	VAR
		res, length: INTEGER; 	hKey: WinApi.HKEY;
	BEGIN
		qValue := "";
		res := WinApi.RegOpenKeyEx(WinApi.HKEY_LOCAL_MACHINE,
														subKey, 	0, 	WinApi.KEY_QUERY_VALUE, 	hKey);
		IF res # WinApi.ERROR_SUCCESS THEN
			RETURN FALSE
		ELSE
			length := LEN(qValue);
			res := WinApi.RegQueryValueEx(hKey, valueName, NIL, NIL, qValue[0], length);
			IF res # WinApi.ERROR_SUCCESS THEN
				RETURN FALSE
			END
		END;
		res := WinApi.RegCloseKey(hKey);
		RETURN TRUE;
	END RegLMQuery;

	PROCEDURE RegCUQuery* (IN subKey, valueName: ARRAY OF SHORTCHAR;
																	OUT qValue: ARRAY OF SHORTCHAR): BOOLEAN;
	VAR
		res, length: INTEGER; 	hKey: WinApi.HKEY;
	BEGIN
		qValue := "";
		res := WinApi.RegOpenKeyEx(WinApi.HKEY_CURRENT_USER,
														subKey, 	0, 	WinApi.KEY_QUERY_VALUE, 	hKey);
		IF res # WinApi.ERROR_SUCCESS THEN
			RETURN FALSE
		ELSE
			length := LEN(qValue);
			res := WinApi.RegQueryValueEx(hKey, valueName, NIL, NIL, qValue[0], length);
			IF res # WinApi.ERROR_SUCCESS THEN
				RETURN FALSE
			END
		END;
		res := WinApi.RegCloseKey(hKey);
		RETURN TRUE;
	END RegCUQuery;

	PROCEDURE RegCUCreateKeyAndSetValue* (IN subKey, valueName: ARRAY OF SHORTCHAR;
																			newValue: ARRAY OF SHORTCHAR): BOOLEAN;
	VAR
		res, length, lpdwDisposition: INTEGER; 	hKey: WinApi.HKEY;
	BEGIN
		res := WinApi.RegCreateKeyEx(WinApi.HKEY_CURRENT_USER, subKey, 0, NIL,
							WinApi.REG_OPTION_NON_VOLATILE, WinApi.KEY_ALL_ACCESS, NIL, hKey, lpdwDisposition);
		IF res # WinApi.ERROR_SUCCESS THEN
			RETURN FALSE
		END;
		res := WinApi.RegSetValueEx(hKey, valueName, 0, WinApi.REG_SZ,
							newValue[0], LEN(newValue$));
		IF res # WinApi.ERROR_SUCCESS THEN
			RETURN FALSE
		END;
		res := WinApi.RegCloseKey(hKey);
		RETURN TRUE
	END RegCUCreateKeyAndSetValue;

	PROCEDURE CheckAndSetPath*;
		CONST
			PATH_Pattern = "\bin\client";

			SMTO_ABORTIFHUNG = {1} (* 2 in C *);
			HWND_BROADCAST = 0FFFFH;

		VAR
			jreHome, regValue, tmpRegValue: ARRAY 2048 OF SHORTCHAR;
			pos, result: INTEGER; noUserPathValue, success, found: BOOLEAN;
			environment: WinApi.PtrSTR;
	BEGIN
		(* get jre home path *)
		IF ~RegLMQuery(HK_LM_JRE_Key, HK_LM_JRE_CurrentVersion_value, tmpRegValue) 	(* e.g. "1.5" *) THEN
			Log.String("UsbUtils: Error getting " + HK_LM_JRE_Key + "! Is Java installed?"); Log.Ln; RETURN
		END;
		IF ~RegLMQuery(HK_LM_JRE_Key + "\" + tmpRegValue, HK_LM_JRE_JavaHome_value, jreHome) THEN
			Log.String("UsbUtils: Error getting " + HK_LM_JRE_Key + "\" + tmpRegValue + "! Is Java installed?"); Log.Ln; RETURN
		END;
		(* look for %javahome%\bin\client on system and user path*)
		regValue := jreHome + PATH_Pattern;
		found := RegLMQuery(HK_LM_PATH_Key, "Path", tmpRegValue);
		Strings.Find(LONG(tmpRegValue), LONG(regValue), 0, pos);
		found := pos >= 0;
		IF found THEN
			Log.String("the PATH system variable " + regValue + " is already set"); Log.Ln;
			RETURN
		END;
		tmpRegValue := "";
		noUserPathValue := ~RegCUQuery(HK_CU_PATH_Key, PATH_value, tmpRegValue);
		Strings.Find(LONG(tmpRegValue), PATH_Pattern, 0, pos);
		found := pos >= 0;
		IF ~found THEN	(* insert registry key into user PATH variable *)
			IF tmpRegValue = "" THEN
				tmpRegValue := regValue;
			ELSE
				tmpRegValue := tmpRegValue + ";" + regValue
			END;
			IF RegCUCreateKeyAndSetValue(HK_CU_PATH_Key, PATH_value, tmpRegValue) THEN
				IF noUserPathValue THEN	(* create user PATH value first *)
					Log.String("user value PATH created"); Log.Ln;
				END;
				Log.String(regValue + " added to user PATH"); Log.Ln;
			ELSE
				Log.String("UsbUtils: Error on CreateKey with value " + tmpRegValue); Log.Ln;
			END;
			(* Notify windows about Environment Change (if this is not done, the changes will only take effect after reboot) *)
			Log.String("Updating Environment - this may take some seconds..."); Log.Ln;
			environment := ComTools.NewSString("Environment");
			result := WinApi.SendMessageTimeout(HWND_BROADCAST, WinApi.WM_SETTINGCHANGE, 0,
													SYSTEM.VAL(INTEGER, environment), SMTO_ABORTIFHUNG, 2000, result);
			Log.String("Please restart Blackbox"); Log.Ln;
		ELSE
			Log.String("the PATH user variable " + regValue + " is already set"); Log.Ln;
		END
	END CheckAndSetPath;

END UsbUtils.