CREATE PROCEDURE [dbo].[sp_LockGet]     
     @UserId						INT				= NULL
     ,@UserName						NVARCHAR(50)	= NULL
     ,@ItemId						INT				= NULL
     ,@ItemKey						NVARCHAR(50)	= NULL
	 ,@ItemCategory					NVARCHAR(50)
     ,@MachineName					NVARCHAR(50)
     ,@errorNumber					INT				OUTPUT
     ,@errorMessage					NVARCHAR(250)	OUTPUT
     ,@LockingUser					NVARCHAR(50)	OUTPUT
     ,@LockingMachineName			NVARCHAR(50)	OUTPUT
     ,@LastUsedTime					DATETIME		OUTPUT
	 ,@LockCreateTime				DATETIME		OUTPUT
	 ,@LockedItemCategory			INT				OUTPUT
	 ,@LockedItemId					INT				OUTPUT
AS
BEGIN
 SET @errorNumber			= 0 
 SET @errorMessage			= SPACE(0)
 SET @LockingUser			= SPACE(0)
 SET @LockingMachineName	= SPACE(0)
 SET @LastUsedTime			= NULL
 SET @LockCreateTime		= NULL
 DECLARE @CategoryId		INT
 
 IF NOT EXISTS( SELECT CategoryId FROM LockedItemCategories WHERE CategoryText=@ItemCategory)
 BEGIN
  INSERT INTO LockedItemCategories (CategoryText) VALUES (@ItemCategory)
  SET @CategoryId = SCOPE_IDENTITY()
  SET @LockedItemCategory = @CategoryId
 END
 ELSE
 BEGIN
  SELECT @CategoryId = CategoryId from LockedItemCategories WHERE CategoryText=@ItemCategory
  SET @LockedItemCategory = @CategoryId
 END
 
 IF @ItemId IS NULL
 BEGIN
	 IF @ItemCategory = 'TestSetup'
	 BEGIN
		IF NOT EXISTS( SELECT TestSetupId from TestSetups WHERE TestSetupName=@ItemKey)
		BEGIN
			SET @errorNumber = 1
			SET @errorMessage = 'TestSetup not found'
			SET @LockedItemId = -1
			return -1
		END
		ELSE
		BEGIN
			SELECT @ItemId = TestSetupId from TestSetups where TestSetupName=@ItemKey
			SET @LockedItemId = @ItemId
		END
	 END
	 ELSE IF @ItemCategory = 'Group'
	 BEGIN
		IF NOT EXISTS( SELECT Id from Groups WHERE SerialNumber=@ItemKey)
		BEGIN
			SET @errorNumber = 1
			SET @errorMessage = 'Group not found'
			SET @LockedItemId = -1
			return -1
		END
		ELSE
		BEGIN
			SELECT @ItemId = Id from Groups where SerialNumber=@ItemKey
			SET @LockedItemId = @ItemId
		END
	 END
	 ELSE IF @ItemCategory = 'Sensor'
	 BEGIN
		IF NOT EXISTS( SELECT Id from Sensors WHERE SerialNumber=@ItemKey)
		BEGIN
			SET @errorNumber = 1
			SET @errorMessage = 'Sensor not found'
			SET @LockedItemId = -1
			return -1
		END
		ELSE
		BEGIN
			SELECT @ItemId = Id from Sensors where SerialNumber=@ItemKey
			SET @LockedItemId = @ItemId
		END
	 END
	 ELSE
	 BEGIN
		SET @errorNumber = 4
		SET @errorMessage = 'Unknown category'
		SET @LockedItemId = -1
		return -1
	 END
 END
 ELSE
 BEGIN
	SET @LockedItemId=@ItemId
 END
 
 IF(@UserId) IS NULL
 BEGIN
  IF NOT EXISTS( SELECT ID FROM Users WHERE UserName=@UserName)
  BEGIN
   SET @errorNumber = 2
   SET @errorMessage = 'User not found'
   return -1
  END
 END

 IF NOT EXISTS( SELECT LockId FROM LockedItems WHERE CategoryId=@CategoryId AND ItemId=@ItemId)
 BEGIN
  DECLARE @InsertTime DateTime
  SET @InsertTime = GETDATE()
  INSERT INTO LockedItems (CategoryId, ItemId, MachineName, DataPROUserID, StartTime, LastTouch) VALUES (@CategoryId, @ItemId, @MachineName, @UserId, @InsertTime, @InsertTime)
 END
 ELSE
 BEGIN  
  SELECT @LockingUser = B.UserName, @LockingMachineName=A.MachineName, @LastUsedTime=A.LastTouch, @LockCreateTime=A.StartTime FROM LockedItems as A INNER JOIN Users as B on A.DataPROUserID=B.ID WHERE A.CategoryId=@CategoryId AND A.ItemId=@ItemId
  SET @errorNumber = 3
  SET @errorMessage = 'Already locked'
  return -1
 END
END