-- Shop General



DROP TRIGGER IF EXISTS before_insert_Shop_General;
DROP TRIGGER IF EXISTS before_update_Shop_General;

DELIMITER //
CREATE TRIGGER before_insert_Shop_General
BEFORE INSERT ON Shop_General
FOR EACH ROW
BEGIN
	SET NEW.created_on := IFNULL(NEW.created_on, NOW());
    SET NEW.created_by := IFNULL(NEW.created_by, IFNULL((SELECT id_user FROM Shop_User WHERE firstname = CURRENT_USER()), -1));
END //
DELIMITER ;

DELIMITER //
CREATE TRIGGER before_update_Shop_General
BEFORE UPDATE ON Shop_General
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_General_Audit (
		id_general,
        name_field,
        value_prev,
        value_new,
        id_change_set
    )
    -- Changed quantity max
	SELECT NEW.id_general, 'quantity_max', CONVERT(OLD.quantity_max, CHAR), CONVERT(NEW.quantity_max, CHAR), NEW.id_change_set
		WHERE NOT OLD.quantity_max <=> NEW.quantity_max
	;
END //
DELIMITER ;