USE fetchmetrics;

DROP TRIGGER IF EXISTS fetchmetrics.before_insert_DOG_Company;
DROP TRIGGER IF EXISTS fetchmetrics.before_update_DOG_Company;


DELIMITER //
CREATE TRIGGER fetchmetrics.before_insert_DOG_Company
BEFORE INSERT ON fetchmetrics.DOG_Company
FOR EACH ROW
BEGIN
	SET NEW.created_on := IFNULL(NEW.created_on, NOW());
END //
DELIMITER ;


DELIMITER //
CREATE TRIGGER fetchmetrics.before_update_DOG_Company
BEFORE UPDATE ON fetchmetrics.DOG_Company
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 fetchmetrics.DOG_Company_Audit (
		id_company,
        name_field,
        value_prev,
        value_new,
        id_change_set
    )
    -- Changed name
	SELECT NEW.id_company, 'name', OLD.name, NEW.name, NEW.id_change_set
		WHERE NOT OLD.name <=> NEW.name
	UNION
	-- Changed website
	SELECT NEW.id_company, 'website', OLD.website, NEW.website, NEW.id_change_set
		WHERE NOT OLD.website <=> NEW.website
	UNION
	-- Changed active
	SELECT NEW.id_company, '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 ;