How To Make A Varchar 14 Len By Adding Leading 0's

Hi All,

I have a table called Table1 which has a field called ProductID (nvarchar type). The records are numeric, and each record may have different length of characters. The maximum length of character is 13. The records are like this

ProductID
7830005602
7378
64975259599
1380010072

As you can see it has records of different length.
In my SELECT a) first I want to make the ProductID length of 13 characters by adding leading zero's, if lenght of characters is already 13 then I will not add any leading zeros. b) Once all records have a length of 13 character then I want to put a dash "-" after first 8 characters. This way the final lenght of characters would be 14. I want to do a) & b) in one single SELECT statement.

So my final output for above example would be,
00078300-05602
00000000-07378
00649752-59599
00013800-10072

Any quick help would be highly appreciated.

Thanks,

Zee