#!/bin/bash
## INSTALL pdf2book in Linux or macOS
### Dependencies: 
# - bash: check with `bash --version`
# - python3: check with `python3 --version`
#- venv: check with `python3 -m venv --help`
#
# check dependencies
set -e
bash --version > /dev/null
python3 --version > /dev/null
python3 -m venv --help > /dev/null
set +e
#
PREFIX="$HOME/.local"
HELP="""
$0: install pdf2book with its virtual environment
usage:
	-h|--help           show this help message and exti
	-d|--delete         remove pdf2book installation
	-f|--force          force overwriting of PREFIX/lib/pdf2book.git
	                    can be used for upgrading
	-p|--prefix PREFIX  install into PREFIX/lib and PREFIX/bin
	-v|--verbose        print more info (set -x)
	-y|--yes            don't ask for confimation of prefix
"""
# OPTIONS
# Iterate through each argument
while [[ $# -gt 0 ]]; do
	case "$1" in
		--delete|-d)
		DELETE=1
		echo 'THIS DOES NOTHING AT THE MOMENT ...'
		echo 'todo:'
		echo " - [ ] remove $PREFIX/pdf2book.git"
		echo " - [ ] and clean your ~/.bashrc or ~/.zshrc"
		exit 0
	;;
		--force|-f)
		FORCE=1
	;;
		--help|-h)
		echo "$HELP"
		# Add help instructions here
		exit 0
	;;
		--prefix|-p)
		PSET=1
		PREFIX=$2
		shift 1
	;;
		--verbose|-v)
		set -x
	;;
		--yes|-y)
		PSET=1
	;;
		*)
		echo "Unknown option: $1"
		echo "HELP"
		exit 1
	;;
	esac
shift 1  # Move to the next argument
done

if [[ $PSET != 1 ]]
then 
	echo -n """Where to do you want to install 'pdf2book'?
PREFIX [$PREFIX] : 
"""
	read userprefix
	if [[ -n $userprefix ]] 
	then 
		PREFIX=$userprefix
	fi
fi

LIBDIR=$PREFIX/lib
BINDIR=$PREFIX/bin
SRCDIR=$LIBDIR/pdf2book.git
if [[ -d $SRCDIR ]] 
then 
	if [[ -z $FORCE ]]
	then 
		echo -n """Directory '$SRCDIR' already exist. 
Do you want to overwrite? [y/N] """
		read confirm && [[ $confirm == [yY] || $confirm == [yY][eE][sS] ]] || echo "... exiting ..." && exit 1
	fi 
	rm -rf $SRCDIR
fi 
mkdir -p $LIBDIR $BINDIR
git clone https://git.wlankabel.at/onipa/pdf2book.git $SRCDIR
python3 -m venv $SRCDIR/.venv
. $SRCDIR/.venv/bin/activate
pip3 install pypdf
echo -n '''#!/bin/bash
SRCDIR='$SRCDIR'
VENVDIR=$SRCDIR/.venv
. $VENVDIR/bin/activate
python3 $SRCDIR/pdf2book.py $@
deactivate
'''> $BINDIR/pdf2book
chmod +x $BINDIR/pdf2book
echo "pdf2book is installed into '$(realpath $BINDIR)'"
#check if $BINDIR is in $PATH
INPATH=$(echo $PATH | tr : '\n' | grep $(realpath $BINDIR) | wc -l )
if [[ $INPATH -lt 1 ]] 
then 
	if [[ $(uname) == "Darwin" ]] 
	then 
		RCFILE='.zshrc'
	else 
		RCFILE=".bashrc"
	fi
	echo "WARNING! '$BINDIR' is not in \$PATH"
	echo -n """Do you want to add '$BINDIR' to \$PATH (via ~/$RCFILE)? [Y/n] """
	read confirm
	if [[ $confirm == [yY] || $confirm == [yY][eE][sS] || -z $confirm ]] 
	then 
		echo 'export PATH=$PATH:'$(realpath $BINDIR) >> $HOME/$RCFILE
	fi
fi
#echo inpath: $INPATH
echo "you might need to restart your shell"
#echo prefix: $PREFIX