#!/usr/bin/env bash

###
# This will mount an existing floppy disk image on a loop device
# Or, it will create a disk image, and then mount it on a loop device
###

MEDIADIR="/media/gmgauthier"
format=0 # Don't format disk images that already exist

# get name of freshly created blank disk, or create one
if [ $# -eq 0 ]; then
    echo ">>> NEW 1.44MB DISK IS BEING CREATED..."
    PREFIX="floppy"
    RANDO=$(od -An -N4 -i < /dev/urandom|sed 's/[ -]//g')
    DISK="$PREFIX$RANDO"
    dd if=/dev/zero of=$DISK.img bs=1k count=1440
    format=1
else
    DISK=$1
    if [ $# -eq 1 ]; then
        echo "Second argument should be disk size in kbytes: 360, 720, 1440"
        exit 1
    fi
    SIZE=$2
    if ! [ -f $DISK.img ]; then
        dd if=/dev/zero of=$DISK.img bs=1k count=$SIZE
        format=1
    fi
fi

# Find the next available loop device on the system
echo ">>> LOOP DEVICE IS BEING IDENTIFIED..."
list=$(losetup -O name|sed 's/\/dev\/loop//g'|sed 's/NAME//g'|sort - --sort=human-numeric)
### listarr=(${(@s: :)list}) # zsh version of the array generator
listarr=($(echo $list | tr " " "\n")) #bash version of array generator
lastdev=${listarr[-1]}
lastdevnum=$((lastdev))
nextdev=$((lastdevnum+1))

# allocate the next available loop device, format the disk, and mount it.
nextdevname="/dev/loop$nextdev"
echo ">>> LOOP DEVICE $nextdevname RESERVED FOR DISK: $DISK.img"

sudo losetup $nextdevname $DISK.img

if [ $format -eq 1 ]; then
    echo ">>> DISK IMAGE IS RAW AND WILL BE FORMATTED"
    sudo mkfs -t vfat $nextdevname
fi

if ! [ -d $MEDIADIR/$DISK ]; then
    echo ">>> MOUNT DIRECTORY NOT FOUND. CREATING DIRECTORY NOW."
    sudo mkdir $MEDIADIR/$DISK                                          
fi

echo ">>> DISK $DISK.img MOUNTING AT LOCATION: $MEDIADIR/$DISK"
sudo mount $DISK.img $MEDIADIR/$DISK

if [ $format -eq 1 ]; then
    echo ">>> DISK INFORMATION BEING COPIED TO $DISK.img"
    sudo fdisk -l $nextdevname >> $DISK-fdisk.txt
    sudo cp $DISK-fdisk.txt $MEDIADIR/$DISK/$DISK.txt && rm $DISK-fdisk.txt
fi
