#!/bin/sh
#    Glacier - A simple package management system written in POSIX sh
#    Copyright (C) 2022  Everest Linux Development Group
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <https://www.gnu.org/licenses/>.

# Preloading
	/usr/bin/gscripts preload
	export input

# Main Script
	while [[ $# -gt 0 ]]; do
		case $1 in
			-h|--help)
				printf "$blue [ * ] Glacier - A source based package manager written in POSIX sh [ * ] $reset\n"
				printf "$blue=== Information ====================================================================================$reset\n"
				printf "$ glacier {-h --help}			show this message and exit\n"
				printf "$ glacier {--version}			display the current Glacier version and exit\n"
				printf "$blue=== Package Operations =============================================================================$reset\n"
				printf "# glacier {install -f}			install a package\n"
				printf "# glacier {update -u}			update a package\n"
				printf "# glacier {remove -x}			remove a package\n"
				printf "$ glacier {query -q}			query a package\n"
				printf "# glacier {cache -c}			cache a package\n"
				printf "# glacier {cache-install -ci}		install a cached package\n"
				printf "# glacier {cache-clear -cc}		clear the package cache\n"
				printf "$blue=== Debugging ======================================================================================$reset\n"
				printf "$ glacier {--showDebugInfo}		show debugging info\n"
				printf "$blue=== Licensing ======================================================================================$reset\n"
				printf "This program is freely distributable under the terms of the GNU General Public License version 3 or later.\n"
				printf "You should have recieved a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.\n"
				printf "======================================================================================================\n"
				exit 0
			;;
			--version)
				printf "$blue Glacier v$GLACIER_RELEASE $reset\n"
				exit 0
			;;
			install|-f)
				# Require script to be run as root
				if [[ $(/usr/bin/id -u) -ne 0 ]]; then
					$GLACIER_ERROR_NO_ROOT
					exit 1
				fi
				
				$GLACIER_WHICH_PKG && read input
				export input
				$GLACIER_STATUS_INSTALLING
				/usr/bin/gscripts download
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_DOES_NOT_EXIST
						exit 1
					fi
				$GLACIER_STATUS_INTEGRITY_CHECK
				mkdir $input && mv $input.tar.gz $input && cd $input
				/usr/bin/gscripts integrity-check
					if [ "$?" != "0" ]; then
						exit 1
					fi
				$GLACIER_STATUS_UNPACKING
				tar -xvf $input.tar.gz
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_CANNOT_UNPACK
						exit 1
					fi
				chmod +x INSTALL.sh
				chmod +x $input.ts.sh
				$GLACIER_STATUS_EXECUTING
				./INSTALL.sh
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_INSTRUCTIONS_CANNOT_EXECUTE
						exit 1
					fi
				./$input.ts.sh
				/usr/bin/gscripts post-install
				$GLACIER_SUCCESS
				exit 0
			;;
			update|-u)
				# Require script to be run as root
				if [[ $(/usr/bin/id -u) -ne 0 ]]; then
					$GLACIER_ERROR_NO_ROOT
					exit 1
				fi

				$GLACIER_WHICH_PKG && read input
				export input
				$GLACIER_STATUS_UPDATING
				/usr/bin/gscripts download
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_DOES_NOT_EXIST
						exit 1
					fi
				$GLACIER_STATUS_INTEGRITY_CHECK
				mkdir $input && mv $input.tar.gz $input && cd $input
				/usr/bin/gscripts integrity-check
					if [ "$?" != "0" ]; then
						exit 1
					fi
				$GLACIER_STATUS_UNPACKING
				tar -xvf $input.tar.gz
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_CANNOT_UNPACK
						exit 1
					fi
				chmod +x UPDATE.sh
				chmod +x $input.ts.sh
				$GLACIER_STATUS_EXECUTING
				./UPDATE.sh
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_INSTRUCTIONS_CANNOT_EXECUTE
						exit 1
					fi
				./$input.ts.sh
				/usr/bin/gscripts post-install
				$GLACIER_SUCCESS
				exit 0
			;;
			remove|-x)
				# Require script to be run as root
				if [[ $(/usr/bin/id -u) -ne 0 ]]; then
					$GLACIER_ERROR_NO_ROOT
					exit 1
				fi

				$GLACIER_WHICH_PKG && read input
				$GLACIER_STATUS_REMOVING
				export input
				/usr/bin/gscripts download
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_DOES_NOT_EXIST
						exit 1
					fi
				$GLACIER_STATUS_INTEGRITY_CHECK
				mkdir $input && mv $input.tar.gz $input && cd $input
				/usr/bin/gscripts integrity-check
					if [ "$?" != "0" ]; then
						exit 1
					fi
				$GLACIER_STATUS_UNPACKING
				tar -xvf $input.tar.gz
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_CANNOT_UNPACK
						exit 1
					fi
				chmod +x REMOVE.sh
				chmod +x $input.ts.sh
				$GLACIER_STATUS_EXECUTING
				./REMOVE.sh
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_INSTRUCTIONS_CANNOT_EXECUTE
						exit 1
					fi
				./$input.ts.sh
				/usr/bin/gscripts post-install
				$GLACIER_SUCCESS
				exit 0
			;;
			query|-q)
				$GLACIER_WHICH_PKG && read input
				cat /etc/glacier/pkginfo/$input-pkginfo.json
				cat /var/log/glacier/$input.timestamp
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_NOT_INSTALLED
						exit 1
					fi
				exit 0
			;;
			cache|-c)
				if [[ $(/usr/bin/id -u) -ne 0 ]]; then
					$GLACIER_ERROR_NO_ROOT
					exit 1
				fi

				$GLACIER_WHICH_PKG && read input
				$GLACIER_STATUS_CACHING
				export input
				/usr/bin/gscripts download
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_DOES_NOT_EXIST
						exit 1
					fi
				$GLACIER_STATUS_INTEGRITY_CHECK
				mv $input.tar.gz /var/cache/glacier && cd /var/cache/glacier
				/usr/bin/gscripts integrity-check
					if [ "$?" != "0" ]; then
						exit 1
					fi
				$GLACIER_SUCCESS
				exit 0
			;;
			cache-install|-ci)
				if [[ $(usr/bin/id -u) -ne 0 ]]; then
					$GLACIER_ERROR_NO_ROOT
					exit 1
				fi

				$GLACIER_WHICH_PKG && read input
				$GLACIER_STATUS_INSTALLING
				export input
				cd /var/cache/glacier && cp $input.tar.gz /tmp && cd /tmp
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_NOT_IN_CACHE
						exit 1
					fi
				$GLACIER_STATUS_UNPACKING
				mkdir $input && mv $input.tar.gz $input && cd $input
				tar -xvf $input.tar.gz
					if [ "$?" != "0" ]; then
						$GLACIER_ERROR_CANNOT_UNPACK
						exit 1
					fi
				$GLACIER_STATUS_EXECUTING
				chmod +x INSTALL.sh
				chmod +x $input.ts.sh
				./INSTALL.sh
					if [ "$!" != "0" ]; then
						$GLACIER_ERROR_INSTRUCTIONS_CANNOT_EXECUTE
						exit 1
					fi
				./$input.ts.sh
				/usr/bin/gscripts post-install
				$GLACIER_SUCCESS
				exit 0
			;;
			cache-clear|-cc)
				if [[ $(/usr/bin/id -u) -ne 0 ]]; then
					$GLACIER_ERROR_NO_ROOT
					exit 1
				fi
			
				$GLACIER_STATUS_CLEARING
				cd /var/cache/glacier && rm -rf *
				$GLACIER_SUCCESS
				exit 0
			;;
			--showDebugInfo)
				printf "Glacier v$GLACIER_RELEASE"
				printf ">> Checking for a viable download backend...\n"
					whereis wget
					whereis curl
					whereis aria2c
				printf ">> Checking which download backend is in use...\n"
					echo $GLACIER_DOWNLOAD_BACKEND
				printf ">> Checking if all Glacier directories and files are present...\n"
					ls /etc | grep glacier
					ls /etc/glacier
					whereis make.conf
				printf ">> If any files are missing, especially make.conf, Glacier will behave abnormally.\n"
				printf ">> Checking if unicode symbols and colors display properly...\n"
				printf "(NOTE): If you use a custom colorscheme, colors may vary.\n"
					printf "$check\n"
					printf "$error\n"
					printf "$warning\n"
					printf "$question\n"
					printf "$red This is a test.$reset\n"
					printf "$green This is a test.$reset\n"
					printf "$yellow This is a test.$reset\n"
					printf "$blue This is a test.$reset\n"
				printf ">> Checking repositories...\n"
					echo $GREPO1
					echo $GREPO2
					echo $GREPO3
					echo $GREPO4
					echo $GREPO5
					echo $GREPO6
					echo $GREPO7
					echo $GREPO8
				printf ">> Debug information has been gathered.\n"
				printf ">> Run 'glacier --showDebugInfo > glacier.debug' to save this information to a file.\n"
				exit 0
			;;
			-*|--*)
			$GLACIER_ERROR_NO_SUCH_OPTION
			exit 1
			;;
			*)
			$GLACIER_ERROR_NO_SUCH_OPTION
			exit 1
			;;
		esac
	done

$GLACIER_ERROR_NO_SUCH_OPTION
exit 1