help with stored procedure for sorting, paging and filtering

I have created a stored procedure that  gets products, filters, sorts and does paging. I am now trying to filter based on product attributes and wondering how to make it dynamic.

I am fetching all attributes based on the search results and all attributes are checkbox with name "filter1". When one of the checkbox is checked, the value is passed onto the procedure as filter1 and this is working so far.

I need to make this dynamic because the method so far only allows a fixed number of parameters.

Attribute tables:

Items_AttributeValues
itemID
attributeValueID

Item_Attribute_Value
id
value
attributeID

Item_Attribute
id
name


Stored procedure so far:

ALTER PROCEDURE [dbo].[web_search_getProducts]

	@searchText as nvarchar (20) = NULL, 
	@brand as nvarchar (20) = NULL,
	@deptID as int = 0,
	@catID as int = 0,
	@filter1 as int = 0,
	@PageNo as integer = 1,
	@PageRecs as integer = 50,
	@OrdType as integer = 0,
	@custID as int = 0


AS
	WITH results AS ( 
	SELECT rowNo = ROW_NUMBER() OVER(ORDER BY 
     	case @OrdType when 0 then i.MSRP end Desc,
     	case @OrdType when 1 then  i.MSRP end Asc,
     	case @OrdType when 2 then  i.subdescription1 end Asc,
     	case @OrdType when 3 then  i.subdescription1 end desc),
     
     	i.ID AS itemID, i.Description AS itemDesc,      
     	i.ItemLookupCode, c.ID AS catID, 
     	c.Name AS catName, d.ID AS deptID, 
     	d.Name AS deptNAme, ie.Description, 
     	ie.Short_Desc, ie.Video, 
     	ie.Image, 
     	ie.Path, 
     	i.Quantity, 
     	i.MSRP, 
     	i.SubDescription1 as brand,
     	a.id as AttributeID,
	a.name as Attribute,
	iav.id as AttributeValueID,
	iav.value as AttributeValue
    
    	FROM dbo.Item i INNER JOIN dbo.Category c ON i.CategoryID = c.ID 
    	INNER JOIN dbo.Department d ON c.DepartmentID = d.ID 
    	INNER JOIN dbo.Item_Extended ie ON i.ID = ie.RMS_ID
    	LEFT JOIN dbo.Items_AttributeValues iavs ON iavs.itemID = i.ID
    	LEFT JOIN dbo.Item_Attribute_Value iav on iav.id = iavs.attributeValueID
    	LEFT JOIN dbo.Item_Attribute a on a.id = iav.attributeID
    
    
    	-- filtering based on fields
    	WHERE 
    	(i.Inactive = 0)    
    	AND (@brand IS NULL OR i.Subdescription1 LIKE '%' + @brand + '%')
    	AND (@deptID = 0 OR d.ID=@deptID)
    	AND (@catID = 0 OR c.ID=@catID)
    	AND ((@searchText IS NULL OR i.Description LIKE '%' + @searchText + '%') OR (@searchText IS NULL OR i.ExtendedDescription LIKE '%' + 

@searchText + '%'))
    
	-- filter based on attribute value
    	AND (@filter1 = 0 OR iav.id=@filter1)
    
  )
    
SELECT *  FROM results WHERE rowNo between ((@PageNo-1)*@pagerecs)+1 and @PageNo*@pagerecs

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