I have various zip files that contain subfolders and no subfolders. I wish to extract all the zip to its folder. My current script does what I want if it contains subfolders. However, if there are no subfolder, it list them separately in same folder which will be confusing as I need to know what they are.

Before unzip folder structure:

JCB-1.zip

- JCB  
   - KDY231-8000018  
      -> file1.txt, file2.txt  
   - KGC30-0152537  
      -> file1.txt, file2.txt  
   - S330V-0034006  
      -> file1.txt, file2.txt  

XZC605-0002319.zip

   - file_1.txt ,file_2.txt, file_3.txt

ZNE10-7845839.zip

- ZNE10-7845839  
  -> file1.txt, file2.txt  

After unzip folder structure:

- KDY231-8000018  
- KGC30-0152537  
- S330V-0034006  
- file_1.txt  
- file_2.txt  
- file_3.txt  

Current Script

#!/bin/bash

ZIPDIR=/mnt/www/log/_tmp
TMP=/tmp/zipfiles

cd $ZIPDIR
rm tmp/zipfiles 2>/dev/null

ls -l *.zip
if [ $? -eq 0 ]
then
  echo ".zip file found"

ls -1 $ZIPDIR/*.zip > $TMP

for i in `cat $TMP`
do
  unzip -o $i && rm $i
done
fi;

# Removing top level folder
mv $ZIPDIR/JCB/* . && rm -R JCB

if [ $? -eq 1 ]
then
  echo "NOT found"
fi;

My thinking is that the zip that doesn't have subfolders, I will need to create them from fileName.zip and not from file_1.txt as the name doesn't make sense. Thus, the final result will be this structure after unzipping.

Final Expecting unzip folder structure:

- KDY231-8000018  
- KGC30-0152537  
- S330V-0034006  
- XZC605-0002319  

Updated: The code provide by @confetti works. Thanks. There is another zip file structure I forgot to mention and I have included above. Here is the final code with my edits. It may not be an efficient code, but it does seem to work for me.

#!/bin/bash

zipdir=/mnt/www/log/_tmp
cd $zipdir

for i in *.zip; do
    folder=${i::-4}
        mkdir -p  $folder
    unzip -o $i -d $folder && rm $i
    subdirs=$(find $folder -type d | wc -l)
    if [[ $subdirs -eq 2 ]]; then
        mv ./$folder/* ./
        rm -r $folder
    else if [[ $subdirs -gt 1 ]]; then
        mv ./$folder/*/* ./
        rm -r $folder
    fi
    fi
done