# Shop User

USE PARTSLTD_PROD;

DROP TRIGGER IF EXISTS before_insert_Shop_User;
DROP TRIGGER IF EXISTS before_update_Shop_User;


DELIMITER //
CREATE TRIGGER before_insert_Shop_User
BEFORE INSERT ON Shop_User
FOR EACH ROW
BEGIN
	IF NEW.created_on <=> NULL THEN
		SET NEW.created_on = NOW();
	END IF;
    IF NEW.created_by <=> NULL THEN
		SET NEW.created_by = CURRENT_USER();
	END IF;
END //
DELIMITER ;


DELIMITER //
CREATE TRIGGER before_update_Shop_User
BEFORE UPDATE ON Shop_User
FOR EACH ROW
BEGIN
	IF OLD.id_change_set <=> NEW.id_change_set THEN
		SIGNAL SQLSTATE '45000'
        SET MESSAGE_TEXT = 'New change Set ID must be provided.';
    END IF;
    
    INSERT INTO Shop_User_Audit (
		id_user,
        name_field,
        value_prev,
        value_new,
        id_change_set
    )
    # Changed name
	SELECT NEW.id_user, 'name', OLD.name, NEW.name, NEW.id_change_set
		WHERE NOT (OLD.name <=> NEW.name)
	UNION
	# Changed is_super_user
	SELECT NEW.id_user, 'is_super_user', CONVERT(CONVERT(OLD.is_super_user, SIGNED), CHAR), CONVERT(CONVERT(NEW.is_super_user, SIGNED), CHAR), NEW.id_change_set
		WHERE NOT (OLD.is_super_user <=> NEW.is_super_user)
	UNION
    # Changed active
	SELECT NEW.id_user, 'active', CONVERT(CONVERT(OLD.active, SIGNED), CHAR), CONVERT(CONVERT(NEW.active, SIGNED), CHAR), NEW.id_change_set
		WHERE NOT (OLD.active <=> NEW.active)
    ;
END //
DELIMITER ;