bash awk search function - bash

Question

I have been trying for hours on a certain parts of my program, I will be greatful if someone can help me. I still cannot solve the problem of adding a new line called "Book is not found" at the bottom when 0 record is found, how do i do that? How do i make the search to be case insensitive also?
awk -F':' -v search="$title" '{ if($1 == search) {printf "%s, %s,%s,%s,%s\n", $1, $2, $3, $4, $5; i++ } else {printf "Book not found"} }END {printf "%d records found\n", i}' BookDB.txt
This give me things like
Title:dwaf
Author:
Book not found
Book not found
Book not found
Total, 0 record found
instead of
Title:wdawd
Author:
Book not found
Total, 0 record found
If a record exist, it will show
Book not found
Book not found
Book not found
Book not found
Happy Day book
Happy Day book
Happy Day book
Book not found
3 records found
instead of
Happy Day book
Happy Day book
Happy Day book
3 records found
This does not show the "book not found" message
if [ "$title" != "" ] && [ "$author" = "" ] ; then
awk -F':' -v search="$title" '{ if($1 == search) {printf "%s, %s,%s,%s,%s\n", $1, $2, $3, $4, $5; i++ } else {printf "Book not found"} }END {printf "%d records found\n", i}' BookDB.txt
if [ "$i" < 1 ]; then
echo -n "Book not found"
fi
Next i have a error of case insensitive
i try to change the code
awk -F':' -v search="$title" 'IGNORECASE = 1;/^search/;'
BEGIN { i=0; }
{
if($1 == search) {
printf "%s, %s,%s,%s,%s\n", $1, $2, $3, $4, $5
i++
}
}
END {
if(i >= 1) {
printf "%d records found\n", i
} else {
printf "Book not found\n"
}
}' BookDB.txt

Answer 1

i isn't a shell variable; it's only an awk variable. Thus, you can only reference it inside of awk code (and in the same instance of awk in which it was set).
Consider the following:
awk -F':' -v search="$title" '
BEGIN { i=0; }
{
if($1 == search) {
printf "%s, %s,%s,%s,%s\n", $1, $2, $3, $4, $5
i++
}
}
END {
if(i >= 1) {
printf "%d records found\n", i
} else {
printf "Book not found\n"
}
}' BookDB.txt
Now, if you wanted to do this in bash, instead of awk, I might write it like so:
#!/bin/bash
# ^-- must be /bin/bash, not /bin/sh
title=$1 # or get it from somewhere else, but needs to be assigned
i=0
while IFS=: read -r -a fields; do
if [[ ${fields[0]} = "$title" ]]; then
IFS=,; printf '%s\n' "${fields[*]}"
i=$(( i + 1 ))
fi
done <BookDB.txt
if (( i > 0 )); then
echo "$i books found" >&2
else
echo "Book not found" >&2
fi
For case-insensitivity, I'd change the bash version like so:
title=${1,,} # store title in lower-case
# ...and lower-case the first field when comparing it.
if [[ ${fields[0],,} = "$title" ]]; then