#!/bin/bash

# Mounts Android Phones and USB drives (encrypted or not). This script will
# replace the older `dmenumount` which had extra steps and couldn't handle
# encrypted drives.
# TODO: Try decrypt for drives in crtypttab
# TODO: Add some support for connecting iPhones (although they are annoying).

IFS='
'
# Function for escaping cell-phone names.
escape() { echo "$@" | iconv -cf UTF-8 -t ASCII//TRANSLIT | tr -d '[:punct:]' | tr '[:upper:]' '[:lower:]' | tr ' ' '-' | sed "s/-\+/-/g;s/\(^-\|-\$\)//g"; }

# Check for phones.
phones="$(simple-mtpfs -l 2>/dev/null | sed "s/^/📱/")"
mountedphones="$(grep "simple-mtpfs" /etc/mtab)"
# If there are already mounted phones, remove them from the list of mountables.
[ -n "$mountedphones" ] && phones="$(for phone in $phones; do
	for mounted in $mountedphones; do
		escphone="$(escape "$phone")"
		[[ "$mounted" =~ "$escphone" ]] && break 1
	done && continue 1
	echo "$phone"
done)"

# Check for drives.
lsblkoutput="$(lsblk -rpo "uuid,name,type,size,label,mountpoint,fstype")"
# Get all LUKS drives
allluks="$(echo "$lsblkoutput" | grep crypto_LUKS)"
# Get a list of the LUKS drive UUIDs already decrypted.
decrypted="$(find /dev/disk/by-id/dm-uuid-CRYPT-LUKS2-* | sed "s|.*LUKS2-||;s|-.*||")"
# Functioning for formatting drives correctly for dmenu:
filter() { sed "s/ /:/g" | awk -F':' '$7==""{printf "%s%s (%s) %s\n",$1,$3,$5,$6}'; }

# Get only LUKS drives that are not decrypted.
unopenedluks="$(for drive in $allluks; do
	uuid="${drive%% *}"
	uuid="${uuid//-/}" # This is a bashism.
	[ -n "$decrypted" ] && for open in $decrypted; do
		[ "$uuid" = "$open" ] && break 1
	done && continue 1
	echo "🔒 $drive"
done | filter)"

# Get all normal, non-encrypted or decrypted partitions that are not mounted.
normalparts="$(echo "$lsblkoutput" | grep -v crypto_LUKS | grep 'part\|rom\|crypt' | sed "s/^/💾 /" | filter)"

# Add all to one variable. If no mountable drives found, exit.
alldrives="$(echo "$phones
$unopenedluks
$normalparts" | sed "/^$/d;s/ *$//")"

# Quit the script if a sequential command fails.
set -e

test -n "$alldrives"

# Feed all found drives to dmenu and get user choice.
chosen="$(echo "$alldrives" | dmenu -p "Mount which drive?" -i)"

# Function for prompting user for a mountpoint.
getmount() {
	mp="$(find /mnt /media /mount /home -maxdepth 1 -type d 2>/dev/null | dmenu -i -p "Mount this drive where?")"
	test -n "$mp"
	if [ ! -d "$mp" ]; then
		mkdiryn=$(printf "No\\nYes" | dmenu -i -p "$mp does not exist. Create it?")
		[ "$mkdiryn" = "Yes" ] && (mkdir -p "$mp" || sudo -A mkdir -p "$mp")
	fi
}

attemptmount() {
	# Attempt to mount without a mountpoint, to see if drive is in fstab.
	sudo -A mount "$chosen" || return 1
	notify-send "💾Drive Mounted." "$chosen mounted."
	exit
}

case "$chosen" in
💾*)
	chosen="${chosen%% *}"
	chosen="${chosen:1}" # This is a bashism.
	attemptmount || getmount
	sudo -A mount "$chosen" "$mp" -o uid="$(id -u)",gid="$(id -g)"
	notify-send "💾Drive Mounted." "$chosen mounted to $mp."
	;;

🔒*)
	chosen="${chosen%% *}"
	chosen="${chosen:1}" # This is a bashism.
	# Number the drive.
	while true; do
		[ -f "/dev/mapper/usb$num" ] || break
		num="$(printf "%02d" "$((num + 1))")"
	done

	# Decrypt in a terminal window
	${TERMINAL:-st} -n floatterm -g 60x1 -e sudo cryptsetup open "$chosen" "usb$num"
	# Check if now decrypted.
	test -b "/dev/mapper/usb$num"

	attemptmount || getmount
	sudo -A mount "/dev/mapper/usb$num" "$mp" -o uid="$(id -u)",gid="$(id -g)"
	notify-send "🔓Decrypted drive Mounted." "$chosen decrypted and mounted to $mp."
	;;

📱*)
	notify-send "❗Note" "Remember to allow file access on your phone now."
	getmount
	number="${chosen%%:*}"
	number="${chosen:1}" # This is a bashism.
	sudo -A simple-mtpfs -o allow_other -o fsname="simple-mtpfs-$(escape "$chosen")" --device "$number" "$mp"
	notify-send "🤖 Android Mounted." "Android device mounted to $mp."
	;;
esac