#!/bin/bash

# Check to see if you supplied an arg, if not
# display usage, then exit with an error
if [ -z "$1" ]
	then
		# Everything between the EOF's will be displayed on the screen
cat <<EOF
Usage: `basename $0` [path_to_mp3's]
EOF
		exit 1
fi

# Sets the directory to a user input
DIRECTORY="$1"

# This should be set incase it changes, you only have to change it here
CDROM="/dev/hdd"

# This gets all the current mp3's in the folder...
# We need this to know which wav's we are deleting.
# Incase there are wav's that were there for some other reason, it
# won't delete them.
ls *.[Mm][Pp]3 | sed 's|.[Mm][Pp]3|.wav|' > CLEANUPFILE

clear

# Open the CDROM, wait 5 seconds and close it
eject $CDROM
sleep 5
eject -t $CDROM

# IF the cdrom sucessfully closes, convert all mp3's to wav's
if [ "$?" -eq "0" ]
	then
		echo "Converting mp3's to wav's..."

		# Convert them into wav's
		cd $DIRECTORY
		TOTAL=`ls *.[Mm][Pp]3 | wc -l`

		# A very bad and crude way of checking if the songs will fit
		# onto the cdrom.  You should check each mp3's length, and
		# compare it to 80 minutes
		# This just takes the amount of mp3's and checks it against 20
		if [ "$TOTAL" -gt 20 ]
			then
				echo "there are 20 or more mp3's, they will not fit"
				exit 1
		fi

		# The main loop for converting

		# Set which track we are converting
		CURRENT=1
		# Run the main loop on all mp3's
		for x in *.[Mm][Pp]3
		do
			# Change the file name from .mp3 to .wav so "sox" can save it as a .wav
			FILECHANGE=`echo "$x" | sed 's|.[Mm][Pp]3|.wav|'`
			# Check if the file already exists, This may be bad if the script errors
			# and you get a half complete wav file.
			if [ -e "$FILECHANGE" ]
				then	
			echo "Skipping file $CURRENT of $TOTAL, .wav file exists"
				else
			echo "Converting file $CURRENT of $TOTAL"
			# The actual converting program.  Sox should be on all major distros
			sox "$x" "$FILECHANGE"
			fi
			# The counter
			CURRENT=$(($CURRENT+1))
		done

		echo "Conversion Complete, now trying to burn..."

		# Burn the wav's onto the cd
		# You may want to add other options like speed, tao or dao, etc.
		cdrecord dev $CDROM "$DIRECTORY/*.wav"
		# If cdrecord completes sucessfully, then eject the drive
		if [ $? -eq 0 ]
			then
				echo "Burning successful.  Ejecting drive..."
		fi

		# Sleep, and cycle the cdrom
		sleep 5
		eject /dev/hdd
		sleep 5
		eject -t /dev/hdd
	else
		echo "Something went wrong with closing the CDROM"
		exit 1
fi

# remove only the .wav's that we created.
cat CLEANUPFILE | sed "s|'|'\\\''|" | sed "s|^|rm '|" | sed "s|$|'|" | bash

# Removes the CLEANUPFILE, I use a dump to perserve formatting.
rm CLEANUPFILE

exit 0