USE [Elyse_DB]
GO
/****** Object:  StoredProcedure [controlling].[usp_DEL_function_list]    Script Date: Sat 05-09-2026 7:01:55 AM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:		Silkwood Software
-- Create date: 09-01-2024
-- Description:	Initial creation
-- Deletes a record from people.function_lists
-- Input is a function list id and a function id.  
-- Output is a status message and transation status.  
/*
COPYRIGHT NOTICE
This database schema and stored procedures are protected by copyright.
Copyright.  Silkwood Software Pty. Ltd. 2023
*/
-- =============================================
/**
* Deletes a record from people.function_lists
* 
* **Acceptable Inputs:**
*
* - @functionlistid bigint: Must be a non-null and non-empty valid identifier from the function_list_names table.
* - @functionid bigint: Must be a valid id from the duty_functions table
* - The pair of @functionlistid and @functionid must match an existing record
*
*
* **Return Values:**
*
* - @message nvarchar(1000) OUTPUT: Descriptive status message of the procedure's execution.
* - @transaction_status nchar(50) OUTPUT: Indicates the transaction status ('Good', 'Bad', or default 'Transaction not attempted').
*
* **Error and Exception Conditions:**
*
* - User Role Validation Fail: Returns 'No Permission' message.
* - Data Validation Fail: Returns messages for invalid input data.
*
* **Side Effects:**
*
* - Deletes a record from people.function_lists 
*
* **Preconditions:**
*
* - The user executing the procedure must have the 'Controller' role.
*
* **Postconditions:**
* - The procedure returns status messages indicating the outcome of the operation.
*
*/
-- =========================================================
CREATE PROCEDURE [controlling].[usp_DEL_function_list] 

         
	 @functionlistid bigint           = NULL,
	 @functionid bigint               = NULL, 
	 @app_reference nvarchar(1000)    = '',    -- Optional
	 @notes nvarchar(1000)            = '',    -- Optional
	 @message nvarchar(1000)          = '' OUTPUT,
	 @transaction_status nvarchar(50) = NULL OUTPUT


AS
BEGIN
	-- SET NOCOUNT ON added to prevent extra result sets from
	-- interfering with SELECT statements.
	SET NOCOUNT ON;

  DECLARE 
        @tempmessage nvarchar(300)           = '',
		@tempuserauth_status nchar(10)       = '',
	    @connectedusersid varbinary(100)     = SUSER_SID(ORIGINAL_LOGIN()),   -- The SID of the connected user
	    @username nvarchar(150)              = ORIGINAL_LOGIN(),     -- The username 
	    @validationmessage nvarchar(200)     = '', -- Communicates that the transaction failed due to data validation
		@userauthentication_status nchar(10) = 'Fail', -- The outcome of the authentication check of the user 
		@transaction_ready nchar(10)         = 'Ready',
		@data_validation_status nchar(10)    = 'Pass';

  -- Parameters which have been initialised at declaration but not explicitly set might be output as null to calling functions.
  SET @transaction_status = 'Transaction not attempted';  

	 
  -- Connected user authentication
  -- Authenticate the connected user for the role
  EXEC [internal].[usp_AUTHENTICATE_user_role] 
        @role_to_check = 'Controller',
		@user_authentication_result = @userauthentication_status OUTPUT;
  IF @userauthentication_status = 'Fail'
    BEGIN  -- The user does not have permission for this action
		SET @transaction_ready      = 'Fail';
	    EXEC internal.usp_SEL_message 
            @message_id   = 'NoPermission', 
			@message_text = @tempmessage OUTPUT;
	    IF (@tempmessage IS NOT NULL) 
  	       SET @message = CONCAT(@message, ' | ', ISNULL(@username, ''), '  ', @tempmessage);
	    ELSE 
		   SET  @message = CONCAT_WS(' | ', @message,'A database level message error occurred on NoPermission.');
	END

  IF @userauthentication_status = 'Pass' -- Don't do anything if the user is not authorised.
    BEGIN
	  -- Data validation

	  -- Check the function list id
	  IF @functionlistid = 0
	     SET @functionlistid = NULL;
      IF @functionlistid IS NULL
			 BEGIN
			   SET @data_validation_status = 'Fail';
			   SET @transaction_ready      = 'Fail';
			   EXEC internal.usp_SEL_message 
					@message_id = 'NoFunctionListID', 
					@message_text = @tempmessage OUTPUT;
  			   IF (@tempmessage IS NOT NULL) 
				  SET @message = CONCAT_WS(' | ', @message, @tempmessage);
			   ELSE 
				  SET @message = CONCAT_WS(' | ', @message, 'A database level message error occurred on NoFunctionListID.');
			 END


	 -- Check the function id
		  IF @functionid = 0
			 SET @functionid = NULL; 
		  -- Check record id has been supplied
		  IF @functionid IS NULL
			 BEGIN
			   SET @data_validation_status = 'Fail';
			   SET @transaction_ready      = 'Fail';
			   EXEC internal.usp_SEL_message 
					@message_id = 'NoFunctionID', 
					@message_text = @tempmessage OUTPUT;
  			   IF (@tempmessage IS NOT NULL) 
				  SET @message = CONCAT_WS(' | ', @message, @tempmessage);
			   ELSE 
				  SET @message = CONCAT_WS(' | ', @message, 'A database level message error occurred on NoFunctionID.');
			 END



	 -- Check if the record exists.  Only perform this check if both parameters have been supplied.
	 IF @data_validation_status = 'Pass'
	    AND NOT EXISTS 
			(SELECT fl.function_list_id
			   FROM people.function_lists AS fl
			  WHERE fl.function_list_id = @functionlistid
					AND fl.function_id  = @functionid)
		BEGIN -- Record doesn't exist
			SET @data_validation_status = 'Fail';
			SET @transaction_ready      = 'Fail';
			EXEC internal.usp_SEL_message
					@message_id = 'NotExist',
					@message_text = @tempmessage OUTPUT;
  					IF (@tempmessage IS NOT NULL) 
					SET @message = CONCAT_WS(' | ', @message, @tempmessage);
				ELSE 
					SET @message = CONCAT_WS(' | ', @message, 'A database level message error occurred on NotExist.');
		END



	  -- Output the data validation status failed message
	  IF @data_validation_status = 'Fail'
		BEGIN
		  EXEC internal.usp_SEL_message 
			   @message_id   = 'FailedDataValidation', 
			   @message_text = @tempmessage OUTPUT;
		  IF (@tempmessage IS NOT NULL) 
  		    SET @message = CONCAT_WS(' | ', @message, @tempmessage);
		  ELSE 
		    SET @message = CONCAT_WS(' | ', @message, 'A database level message error occurred on FailedDataValidation');
		END
  -- End data validation


-- Execute the update query

  IF @transaction_ready = 'Ready'
	BEGIN
	  BEGIN TRY
	   BEGIN TRANSACTION;
	     DELETE FROM people.function_lists
		  WHERE function_list_id = @functionlistid
		        AND  function_id = @functionid; 

         -- Write to the privilege log --

		 INSERT INTO user_restr.user_privilege_log
		             (privilege_type,                  privilege_name,      linked_to,     action_type, 
					 created_by_sid_id, valid_from, valid_until, notes, app_reference)
			  VALUES ('Duty Function to Function List Link', 
			           (SELECT name
			              FROM people.function_list_names
						 WHERE function_list_id = @functionlistid),   
			           (SELECT name
					      FROM people.duty_functions
						 WHERE function_id = @functionid),
					   'Revoke',
			         (SELECT sid_id
		                FROM user_restr.sid_list
					   WHERE sid = @connectedusersid), 
					   NULL, NULL, @notes, @app_reference)


	   COMMIT TRANSACTION;
         EXEC internal.usp_SEL_message 
              @message_id   = 'Success', 
              @message_text = @tempmessage OUTPUT;
  	     IF (@tempmessage IS NOT NULL) 
  		    SET @message = CONCAT_WS(' | ', @message, @tempmessage);
		  ELSE 
		    SET @message = CONCAT_WS(' | ', @message, 'A database level message error occurred on Success');
		 SET @transaction_status = 'Good';
   	  END TRY
	  BEGIN CATCH

	     IF XACT_STATE() <> 0
            ROLLBACK TRANSACTION;
	  	 
	     SET @transaction_status = 'Bad';
         EXEC internal.usp_SEL_message 
              @message_id   = 'DeleteError', 
              @message_text = @tempmessage OUTPUT;
		 IF (@tempmessage IS NOT NULL) 
		    SET @message = CONCAT(@message, ' | ', @tempmessage, ' | ', 
		    CONVERT(nvarchar(10),ERROR_NUMBER()), '.  ', ERROR_MESSAGE());
		 ELSE 
		    SET @message = CONCAT_WS(' | ', @message, 'A database level message error occurred on DeleteError');
	  END CATCH
    END


 END -- End IF @userauthentication = 'Pass'

END
GO
