#!/bin/bash

#destdir="/usr/local/firefox32" for firefox32
destdir="/usr/lib/firefox"
FILE="$destdir/res/forms.css"

BEGIN="/*** BEGIN EXTRA FIREFOX WIDGETS ***/"
sed_BEGIN="$(echo "$BEGIN" | sed 's@\*@\\*@g')"
END="/*** END EXTRA FIREFOX WIDGETS ***/"


create_backup()
{
echo "Creating backup $FILE.bak"
sudo cp "$FILE" "$FILE.bak
}


####################
# INSTALL FUNCTION #
####################

install()
{
echo -e "\nWe are going to be installing the firefox widgets.\n\
This consists of widget images contained in the folder \"form-widgets\"\n\
and CSS to be appended to the forms.css file.\n\
----------------------------------\n\
Press enter to begin installation."
read

# Check if widgets have already been installed
grep "$sed_BEGIN" "$FILE" &> /dev/null
if [ "$?" = 0 ] ; then
	echo "The CSS appears to have already been installed."
	css=true
else
	css=false
fi

echo "Installing the widget images"
sudo cp -r form-widgets "$destdir"/res

# Install the css
if [ "$css" = false ] ; then
	# Create a backup if wanted
	loop=true
	while [ "$loop" = true ] ; do
		echo "We are about to overwrite $FILE."
		echo -n 'Would you like to create a backup? (y/n) '
		loop=false
		read backup_choice
		case "$backup_choice" in
			y | Y | [Yy][Ee][Ss] ) 
				if [ -e "$FILE.bak" ] ; then
					 loop1=false
					 while [ "$loop1" = true ] ; do
					 	echo '"$FILE.bak" exists.  Do you want to overwrite the file? (y/n)'
					 	read overwrite_choice
					 	case "$overwrite_choice" in 
					 		[yY] | [Yy][Ee][Ss] )
								create_backup
							;;
							[nN] | [Nn][Oo] )
								echo "No backup will be created."
							;; 
							
							* )
								echo "Incorrect option!"
								loop1=true
							;;
						 		
						 esac
					unset overwrite_choice
					done
					unset loop1
					
				else
					create_backup
				fi
			;;
			n | N | [Nn][Oo] )
				:	
			;;
			* )
				echo "Unknown option!"
				loop=true
			;;
		esac
		unset backup_choice
	done
	unset loop
	echo "Appending forms-extra.css to forms.css"
	sudo bash -c "echo \"$BEGIN\" >> \"$FILE\" ; \
	cat forms-extra.css >> \"$FILE\" ; \
	echo \"$END\" >> \"$FILE\""
fi

if [ "$css" = true ] ; then
	echo "Firefox widgets installed successfully."
}	



######################
# UNINSTALL FUNCTION #
######################	

uninstall()
{
grep "$sed_BEGIN" "$FILE" &> /dev/null
if [ "$?" = 0 ] ; then
	css=true
else
	echo "Text \"$BEGIN\" not found in $FILE"
	echo "The CSS does not appear to be installed."
	css=false
fi	

if [ -d "$destdir/res/form-widgets" ] ; then
	widgets=true
else
	echo "The directory $destdir/res/form-widgets does not exist."
	echo "The widget images do not appear to be installed."
	widgets=false
fi

delete=false
if [ "$css" = true ] ; then
	temp=$(cat "$FILE" | while read line; do
		if [ "$line" = "$BEGIN" ]; then
			delete=true
		fi

		if [ "$delete" = false ]; then
			echo "$line"
		fi

		if [ "$delete" = true ] ; then
			if [ "$line" = "$END" ] ; then
				delete=false
			fi
		fi
	done)
	
	echo "Removing the CSS"
	sudo bash -c "echo \"$temp\" > \"$FILE\""
	unset temp
fi

if [ "$widgets" = true ] ; then
	echo "Removing widget images."
	sudo rm -r "$destdir/res/form-widgets"
fi

if [ "$widgets" = false -a "$css" = false ] ; then
	echo "No actions taken.  Firefox widgets are not installed."
else	
	echo "Firefox widgets successfully removed."
fi
}

echo '1 ) Install Firefox Widgets'
echo '2 ) Remove Firefox Widgets'
echo -n 'Select an Option: '
loop=true
while [ "$loop" = true ] ; do
	read option
	loop=false
	case  "$option" in
		1 )
			install
		;;
		2 ) 
			uninstall
		;;
		* ) 
			echo 'Unknown Option!'
			loop=true
		;;
	esac
	unset option
done
unset loop