-- Shop Product Currency Region Link



DROP TRIGGER IF EXISTS before_insert_Shop_Product_Currency_Region_Link;
DROP TRIGGER IF EXISTS before_update_Shop_Product_Currency_Region_Link;


DELIMITER //
CREATE TRIGGER before_insert_Shop_Product_Currency_Region_Link
BEFORE INSERT ON Shop_Product_Currency_Region_Link
FOR EACH ROW
BEGIN
	IF NEW.created_on <=> NULL THEN
		SET NEW.created_on := IFNULL(NEW.created_on, NOW());
	END IF;
    IF NEW.created_by <=> NULL THEN
		SET NEW.created_by := IFNULL(NEW.created_by, IFNULL((SELECT id_user FROM Shop_User WHERE firstname = CURRENT_USER()), -1));
	END IF;
    /*
    SET NEW.price_local = (
		SELECT PP.price_GBP_full * C.factor_from_GBP
        FROM Shop_Product_Permutation PP
        INNER JOIN Shop_Product P ON PP.id_product = P.id_product
		INNER JOIN Shop_Currency C ON NEW.id_currency = C.id_currency
        WHERE NEW.id_product = P.id_product
        LIMIT 1
	);
    */
END //
DELIMITER ;


DELIMITER //
CREATE TRIGGER before_update_Shop_Product_Currency_Region_Link
BEFORE UPDATE ON Shop_Product_Currency_Region_Link
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;
    
    /*
    SET NEW.price_local = (
		SELECT P.price_GBP_full * C.factor_from_GBP
        FROM Shop_Product P
		INNER JOIN Shop_Currency C ON NEW.id_currency = C.id_currency
        WHERE NEW.id_product = P.id_product
        LIMIT 1
	);
    */
    
    INSERT INTO Shop_Product_Currency_Region_Link_Audit (
		id_link,
        name_field,
        value_prev,
        value_new,
        id_change_set
    )
    /*
    -- Changed id_product
	SELECT NEW.id_link, 'id_product', CONVERT(OLD.id_product, CHAR), CONVERT(NEW.id_product, CHAR), NEW.id_change_set
		WHERE NOT OLD.id_product <=> NEW.id_product
	UNION
	-- Changed id_currency
	SELECT NEW.id_link, 'id_currency', CONVERT(OLD.id_currency, CHAR), CONVERT(NEW.id_currency, CHAR), NEW.id_change_set
		WHERE NOT OLD.id_currency <=> NEW.id_currency
    UNION
	-- Changed price_local
	SELECT NEW.id_link, 'price_local', OLD.price_local, NEW.price_local, NEW.id_change_set
		WHERE NOT OLD.price_local <=> NEW.price_local
    UNION
    */ 
	-- Changed price_local_VAT_incl
	SELECT NEW.id_link, 'price_local_VAT_incl', OLD.price_local_VAT_incl, NEW.price_local_VAT_incl, NEW.id_change_set
		WHERE NOT OLD.price_local_VAT_incl <=> NEW.price_local_VAT_incl
    UNION
	-- Changed price_local_VAT_excl
	SELECT NEW.id_link, 'price_local_VAT_excl', OLD.price_local_VAT_excl, NEW.price_local_VAT_excl, NEW.id_change_set
		WHERE NOT OLD.price_local_VAT_excl <=> NEW.price_local_VAT_excl
    UNION
	-- Changed id_stripe_price
	SELECT NEW.id_link, 'id_stripe_price', OLD.id_stripe_price, NEW.id_stripe_price, NEW.id_change_set
		WHERE NOT OLD.id_stripe_price <=> NEW.id_stripe_price
    UNION
	-- Changed active
	SELECT NEW.id_link, '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 ;