UNIX for Dummies Questions & Answers

inputfile.txt
file_name1.txt,type_name1.txt
file_name2.txt,type_name2.txt

if file_name*.txt 
then
   wc -l file_name*.txt - 1
if type_name*.txt 
then
   wc -l type_name*.txt -2

outputfile.txt
file_name1.txt - 10,type_name1.txt - 20
file_name2.txt - 20,type_name2.txt - 30

file_name1.txt - 11
file_name2.txt - 12
type_name1.txt-22
type_name2.txt - 32

IFS=","; while read N; do for i in $N; do [[ "$i" =~ type.* ]]; D=$?; echo -n $i - $(($(wc -l < $i) - (2 - $D) )) " "; done; echo; done < file
file_name1.txt - 25  type_name1.txt - 25  
file_name2.txt - 27  type_name2.txt - 28 
when 
wc -l *.txt
  26 file_name1.txt
  28 file_name2.txt
  27 type_name1.txt
  30 type_name2.txt

file_name1.txt type_name1.txt
. 
.
.
.

by default it should be in condition like 
if file_name*.txt then line count to be subtracted by -1
and if type_name*.txt then line count to be subtracted by -2

and one more thing to be added can i add more rows like in my input file for eg:
file_name1.txt,type_name1.txt,type2_name1.txt
.
.
.

how can i achieve for that