#!/bin/sh
#
# Copyright (c) 2012, Ting-Wei Lan. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of the author nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR 
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

PREFIX=/usr/local
PKGDB=/var/pkgdb
PKGDB_COPY=${PKGDB}/copy
PKGDB_DIR=${PKGDB}/dir
PKGDB_SYMLINK=${PKGDB}/symlink

[ "$1" ] && package_name="$1"

if [ -z "${package_name}" ]; then
	read -p "Package to remove: " package_name
	[ -z "${package_name}" ] && echo "No input!" && exit 1
fi

if [ -e "${PKGDB_COPY}/${package_name}" ] || [ -e "${PKGDB_DIR}/${package_name}" ] || [ -e "${PKGDB_SYMLINK}/${package_name}" ]; then
	echo "Found entry ${package_name} in ${PKGDB}"
else
	echo "Package entry ${package_name} does not exist in ${PKGDB}"
	exit 1
fi

read -p "You are going to remove ${package_name}! Is this correct [y/N]? " \
	remove_yes

if [ "${remove_yes}" != "y" ] && [ "${remove_yes}" != "Y" ]; then
	echo "Quit"
	exit 1
fi

echo "List of copied files: "
cat "${PKGDB_COPY}/${package_name}"

read -p "Do you want to remove copied files? This may include your configuration file and other important data! [y/N] " remove_copied

cat "${PKGDB_SYMLINK}/${package_name}" | {
	while read oneline
	do
		printf "[\e[1;36mREMOVE SYMLINK\e[m][-] ${package_prefix}/${oneline}\n"
		rm "${package_prefix}/${oneline}"
	done
}
rm "${PKGDB_SYMLINK}/${package_name}"

if [ "${remove_copied}" = "y" ] || [ "${remove_copied}" = "Y" ]; then
	cat "${PKGDB_COPY}/${package_name}" | {
		while read oneline
		do
			printf "[\e[1;31mREMOVE COPIED\e[m][-] ${package_prefix}/${oneline}\n"
			rm "${package_prefix}/${oneline}"
		done
	}
	rm "${PKGDB_COPY}/${package_name}"
fi

cat "${PKGDB_DIR}/${package_name}" | {
	while read oneline
	do
		printf "[\e[1;35mRMDIR\e[m][-] ${package_prefix}/${oneline}\n"
		rmdir -p "${package_prefix}/${oneline}"
	done
}
rm "${PKGDB_DIR}/${package_name}"

if [ '!' "${remove_copied}" = "y" ] && [ '!' "${remove_copied}" = "Y" ]; then
	echo "Note: ${PKGDB_COPY}/${package_name} still exists!"
fi