USE [Elyse_DB]
GO
/****** Object:  StoredProcedure [controlling].[usp_DEL_duty_function]    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: 08-01-2024
-- Description:	Initial creation
-- Deletes a duty function record in people.duty_functions
-- Input is record id 
-- Output is a status message and transaction status.  
/*
COPYRIGHT NOTICE
This database schema and stored procedures are protected by copyright.
Copyright.  Silkwood Software Pty. Ltd. 2023
*/
-- =============================================
/**
* Deletes a duty function record in people.duty_functions
* 
* **Acceptable Inputs:**
*
* - @id_to_delete bigint: Must be a non-null and non-empty valid identifier.
*
*
* **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.
* - No cross references must exist
*
* **Side Effects:**
*
* - Deletes a record in people.duty_functions 
*
* **Preconditions:**
*
* - The user executing the procedure must have the 'Controller' role.
* - @id_to_delete must be valid and free from referential constraints
*
* **Postconditions:**
* - The procedure returns status messages indicating the outcome of the operation.
*
*/
-- =========================================================
CREATE PROCEDURE [controlling].[usp_DEL_duty_function] 

     @id_to_delete bigint             = NULL,
	 @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)           = '',
	    @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 
		@tempvalidationstatus nchar(10)      = '',
		@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
		  IF @id_to_delete = 0
			 SET @id_to_delete = NULL;
		  -- Check record id has been supplied
		  IF @id_to_delete IS NULL
			 BEGIN
			   SET @data_validation_status = 'Fail';
			   SET @transaction_ready      = 'Fail';
			   EXEC internal.usp_SEL_message 
					@message_id = 'NoRecordID', 
					@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 NoRecordID.');
			 END
		  ELSE -- A record id has been supplied
		    -- Check if the record id exists
			IF NOT EXISTS (SELECT df.function_id
			                 FROM people.duty_functions AS df
							WHERE df.function_id = @id_to_delete)
				 BEGIN
				   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

	  -- Check for any referential constraints
	  IF @data_validation_status = 'Pass'
		BEGIN
		  IF EXISTS (SELECT fl.function_id
					   FROM people.function_lists AS fl
					  WHERE fl.function_id = @id_to_delete)  
			OR EXISTS (SELECT dfsl.function_id 
						 FROM people.duty_function_sid_links AS dfsl
						WHERE dfsl.function_id = @id_to_delete) 
			  BEGIN
				SET @data_validation_status = 'Fail';
				SET @transaction_ready      = 'Fail';
 				EXEC internal.usp_SEL_message 
				   @message_id = 'XRefExists', @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 XRefExists.');

			  END
		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 delete query

  IF @transaction_ready = 'Ready'
	BEGIN
	  BEGIN TRY
	   BEGIN TRANSACTION;
	     DELETE FROM people.duty_functions
		  WHERE function_id = @id_to_delete; 
	   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
