#!/bin/bash
#
# fixes folder name encoding by checking size of folder:
# fixfile.sh file*
#
# e.g fixfile.sh 03.\ Needs\ M*
#
# how we check which folder is most likely to be the right one: compare `du` output and the one that's largest is most likely to be the right one - if at least one of the folders is not empty or at least marginally small (less than 2% of the largest folders size), that means that we have selected the wrong folder

calc()
{
    [ $# != 1] && echo "arg error in calc()" && exit 1
    return "echo "scale=4; $1" | bc"
}

if [ $# != 2 ]; then
    echo "usage: $0 folder1 folder2"
    echo "  the script will automagically find the folder with the correct contents"
    echo "  tip: use shell wildcards, e.g fixfile.sh 03.*"
    exit
fi

export FILEWITHCONTENT
export FILEINCORRECTNAME

FILEONESIZE=`du "$1" | awk '{ print $1 }'`
FILETWOSIZE=`du "$2" | awk '{ print $1 }'`

if [ $FILEONESIZE -gt $FILETWOSIZE ]; then # first argument is the right one
    FILEWITHCONTENT=$1
    FILEINCORRECTNAME=$2
    BIGFOLDER=$FILEONESIZE
    SMALLFOLDER=$FILETWOSIZE
elif [ $FILEONESIZE -lt $FILETWOSIZE ]; then
    FILEWITHCONTENT=$2
    FILEINCORRECTNAME=$1
    BIGFOLDER=$FILETWOSIZE
    SMALLFOLDER=$FILEONESIZE
else # else $FILEONESIZE -eq $FILETWOSIZE
    echo "the folders have the same size, unsure what to do!"
    exit 2
fi

let MULTIPLICATION=$SMALLFOLDER*50
[ $BIGFOLDER -lt $MULTIPLICATION ] && echo "the largest folder isn't at least 50 times bigger than the smallest folder, not touching anything!" && exit 2

[ "$FILEWITHCONTENT" == "" ] && [ "$FILEINCORRECTNAME" == "" ] && echo "logic error somewhere in the script" && exit 

echo "Folder that has content: $FILEWITHCONTENT"
echo "Folder that has incorrect name: $FILEINCORRECTNAME"

TRASHFOLDER=/var/tmp/trash
mkdir -p $TRASHFOLDER
mv "$FILEINCORRECTNAME" $TRASHFOLDER && mv "$FILEWITHCONTENT" "$FILEINCORRECTNAME" && echo "done" && exit
exit 1